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_relative_multiply(\
38 GNUNET_TIME_UNIT_MILLISECONDS, 250)
39 #define MESH_RETRANSMIT_MARGIN 4
43 * All the states a connection can be in.
48 * Uninitialized status, should never appear in operation.
53 * Connection create message sent, waiting for ACK.
58 * Connection confirmed, ready to carry traffic.
65 * Info holder for channel messages in queues.
67 struct MeshChannelQueue
72 struct MeshTunnel3Queue *q;
75 * Message type (DATA/DATA_ACK)
80 * Message copy (for DATAs, to start retransmission timer)
82 struct MeshReliableMessage *copy;
85 * Reliability (for DATA_ACKs, to access rel->ack_q)
87 struct MeshChannelReliability *rel;
92 * Info needed to retry a message in case it gets lost.
94 struct MeshReliableMessage
97 * Double linked list, FIFO style
99 struct MeshReliableMessage *next;
100 struct MeshReliableMessage *prev;
103 * Type of message (payload, channel management).
108 * Tunnel Reliability queue this message is in.
110 struct MeshChannelReliability *rel;
113 * ID of the message (ACK needed to free)
120 struct MeshChannelQueue *q;
123 * When was this message issued (to calculate ACK delay)
125 struct GNUNET_TIME_Absolute timestamp;
127 /* struct GNUNET_MESH_Data with payload */
132 * Info about the traffic state for a client in a channel.
134 struct MeshChannelReliability
137 * Channel this is about.
139 struct MeshChannel *ch;
142 * DLL of messages sent and not yet ACK'd.
144 struct MeshReliableMessage *head_sent;
145 struct MeshReliableMessage *tail_sent;
148 * DLL of messages received out of order.
150 struct MeshReliableMessage *head_recv;
151 struct MeshReliableMessage *tail_recv;
159 * Next MID to use for outgoing traffic.
164 * Next MID expected for incoming traffic.
169 * Handle for queued unique data CREATE, DATA_ACK.
171 struct MeshChannelQueue *uniq;
174 * Can we send data to the client?
179 * Can the client send data to us?
184 * Task to resend/poll in case no ACK is received.
186 GNUNET_SCHEDULER_TaskIdentifier retry_task;
189 * Counter for exponential backoff.
191 struct GNUNET_TIME_Relative retry_timer;
194 * How long does it usually take to get an ACK.
196 struct GNUNET_TIME_Relative expected_delay;
201 * Struct containing all information regarding a channel to a remote client.
206 * Tunnel this channel is in.
208 struct MeshTunnel3 *t;
211 * Destination port of the channel.
216 * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)
218 MESH_ChannelNumber gid;
221 * Local tunnel number for root (owner) client.
222 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
224 MESH_ChannelNumber lid_root;
227 * Local tunnel number for local destination clients (incoming number)
228 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0).
230 MESH_ChannelNumber lid_dest;
235 enum MeshChannelState state;
238 * Is the tunnel bufferless (minimum latency)?
243 * Is the tunnel reliable?
248 * Last time the channel was used
250 struct GNUNET_TIME_Absolute timestamp;
253 * Client owner of the tunnel, if any
255 struct MeshClient *root;
258 * Client destination of the tunnel, if any.
260 struct MeshClient *dest;
263 * Flag to signal the destruction of the channel.
264 * If this is set GNUNET_YES the channel will be destroyed
265 * when the queue is empty.
270 * Total (reliable) messages pending ACK for this channel.
272 unsigned int pending_messages;
276 * Only present (non-NULL) at the owner of a tunnel.
278 struct MeshChannelReliability *root_rel;
282 * Only present (non-NULL) at the destination of a tunnel.
284 struct MeshChannelReliability *dest_rel;
289 /******************************************************************************/
290 /******************************* GLOBALS ***********************************/
291 /******************************************************************************/
294 * Global handle to the statistics service.
296 extern struct GNUNET_STATISTICS_Handle *stats;
299 * Local peer own ID (memory efficient handle).
301 extern GNUNET_PEER_Id myid;
304 /******************************************************************************/
305 /******************************** STATIC ***********************************/
306 /******************************************************************************/
309 * Destroy a reliable message after it has been acknowledged, either by
310 * direct mid ACK or bitfield. Updates the appropriate data structures and
311 * timers and frees all memory.
313 * @param copy Message that is no longer needed: remote peer got it.
314 * @param update_time Is the timing information relevant?
315 * If this message is ACK in a batch the timing information
316 * is skewed by the retransmission, count only for the
317 * retransmitted message.
320 rel_message_free (struct MeshReliableMessage *copy, int update_time);
323 * send a channel create message.
325 * @param ch Channel for which to send.
328 send_create (struct MeshChannel *ch);
331 * Confirm we got a channel create, FWD ack.
333 * @param ch The channel to confirm.
334 * @param fwd Should we send a FWD ACK? (going dest->root)
337 send_ack (struct MeshChannel *ch, int fwd);
342 * Test if the channel is loopback: both root and dest are on the local peer.
344 * @param ch Channel to test.
346 * @return #GNUNET_YES if channel is loopback, #GNUNET_NO otherwise.
349 is_loopback (const struct MeshChannel *ch)
352 return GMT_is_loopback (ch->t);
354 return (NULL != ch->root && NULL != ch->dest);
359 * We have received a message out of order, or the client is not ready.
360 * Buffer it until we receive an ACK from the client or the missing
361 * message from the channel.
363 * @param msg Message to buffer (MUST be of type MESH_DATA).
364 * @param rel Reliability data to the corresponding direction.
367 add_buffered_data (const struct GNUNET_MESH_Data *msg,
368 struct MeshChannelReliability *rel)
370 struct MeshReliableMessage *copy;
371 struct MeshReliableMessage *prev;
375 size = ntohs (msg->header.size);
376 mid = ntohl (msg->mid);
378 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
380 copy = GNUNET_malloc (sizeof (*copy) + size);
383 copy->type = GNUNET_MESSAGE_TYPE_MESH_DATA;
384 memcpy (©[1], msg, size);
388 // FIXME do something better than O(n), although n < 64...
389 // FIXME start from the end (most messages are the latest ones)
390 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
392 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
393 if (GM_is_pid_bigger (prev->mid, mid))
395 LOG (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
396 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
401 LOG (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
402 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
403 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
408 * Add a destination client to a channel, initializing all data structures
409 * in the channel and the client.
411 * @param ch Channel to which add the destination.
412 * @param c Client which to add to the channel.
415 add_destination (struct MeshChannel *ch, struct MeshClient *c)
417 if (NULL != ch->dest)
423 /* Assign local id as destination */
424 ch->lid_dest = GML_get_next_chid (c);
426 /* Store in client's hashmap */
427 GML_channel_add (c, ch->lid_dest, ch);
429 GNUNET_break (NULL == ch->dest_rel);
430 ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
431 ch->dest_rel->ch = ch;
432 ch->dest_rel->expected_delay.rel_value_us = 0;
433 ch->dest_rel->retry_timer = MESH_RETRANSMIT_TIME;
440 * Set options in a channel, extracted from a bit flag field.
442 * @param ch Channel to set options to.
443 * @param options Bit array in host byte order.
446 channel_set_options (struct MeshChannel *ch, uint32_t options)
448 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
449 GNUNET_YES : GNUNET_NO;
450 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
451 GNUNET_YES : GNUNET_NO;
456 * Get a bit flag field with the options of a channel.
458 * @param ch Channel to get options from.
460 * @return Bit array in host byte order.
463 channel_get_options (struct MeshChannel *ch)
469 options |= GNUNET_MESH_OPTION_NOBUFFER;
471 options |= GNUNET_MESH_OPTION_RELIABLE;
478 * Notify the destination client that a new incoming channel was created.
480 * @param ch Channel that was created.
483 send_client_create (struct MeshChannel *ch)
487 if (NULL == ch->dest)
491 opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
492 opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
493 GML_send_channel_create (ch->dest, ch->lid_dest, ch->port, opt,
494 GMT_get_destination (ch->t));
500 * Send data to a client.
502 * If the client is ready, send directly, otherwise buffer while listening
506 * @param msg Message.
507 * @param fwd Is this a fwd (root->dest) message?
510 send_client_data (struct MeshChannel *ch,
511 const struct GNUNET_MESH_Data *msg,
516 if (ch->dest_rel->client_ready)
517 GML_send_data (ch->dest, msg, ch->lid_dest);
519 add_buffered_data (msg, ch->dest_rel);
523 if (ch->root_rel->client_ready)
524 GML_send_data (ch->root, msg, ch->lid_root);
526 add_buffered_data (msg, ch->root_rel);
532 * Send a buffered message to the client, for in order delivery or
533 * as result of client ACK.
535 * @param ch Channel on which to empty the message buffer.
536 * @param c Client to send to.
537 * @param fwd Is this to send FWD data?.
540 send_client_buffered_data (struct MeshChannel *ch,
541 struct MeshClient *c,
544 struct MeshReliableMessage *copy;
545 struct MeshChannelReliability *rel;
547 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
548 rel = fwd ? ch->dest_rel : ch->root_rel;
549 if (GNUNET_NO == rel->client_ready)
551 LOG (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
555 copy = rel->head_recv;
556 /* We never buffer channel management messages */
559 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
561 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
563 LOG (GNUNET_ERROR_TYPE_DEBUG,
564 " have %u! now expecting %u\n",
565 copy->mid, rel->mid_recv + 1);
566 send_client_data (ch, msg, fwd);
569 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
570 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE RECV %p\n", copy);
575 LOG (GNUNET_ERROR_TYPE_DEBUG,
576 " reliable && don't have %u, next is %u\n",
582 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
587 * Allow a client to send more data.
589 * In case the client was already allowed to send data, do nothing.
592 * @param fwd Is this a FWD ACK? (FWD ACKs are sent to root)
595 send_client_ack (struct MeshChannel *ch, int fwd)
597 struct MeshChannelReliability *rel = fwd ? ch->root_rel : ch->dest_rel;
599 LOG (GNUNET_ERROR_TYPE_DEBUG,
600 " sending %s ack to client on channel %s\n",
601 GM_f2s (fwd), GMCH_2s (ch));
609 if (GNUNET_YES == rel->client_allowed)
611 LOG (GNUNET_ERROR_TYPE_DEBUG, " already allowed\n");
614 rel->client_allowed = GNUNET_YES;
616 GML_send_ack (fwd ? ch->root : ch->dest, fwd ? ch->lid_root : ch->lid_dest);
621 * Notify the root that the destination rejected the channel.
623 * @param ch Rejected channel.
626 send_client_nack (struct MeshChannel *ch)
628 if (NULL == ch->root)
633 GML_send_nack (ch->root, ch->lid_root);
638 * We haven't received an ACK after a certain time: restransmit the message.
640 * @param cls Closure (MeshChannelReliability with the message to restransmit)
641 * @param tc TaskContext.
644 channel_retransmit_message (void *cls,
645 const struct GNUNET_SCHEDULER_TaskContext *tc)
647 struct MeshChannelReliability *rel = cls;
648 struct MeshReliableMessage *copy;
649 struct MeshChannel *ch;
650 struct GNUNET_MESH_Data *payload;
653 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
654 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
658 copy = rel->head_sent;
665 payload = (struct GNUNET_MESH_Data *) ©[1];
666 fwd = (rel == ch->root_rel);
668 /* Message not found in the queue that we are going to use. */
669 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
671 GMCH_send_prebuilt_message (&payload->header, ch, fwd, copy);
672 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
677 * We haven't received an Channel ACK after a certain time: resend the CREATE.
679 * @param cls Closure (MeshChannelReliability of the channel to recreate)
680 * @param tc TaskContext.
683 channel_recreate (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
685 struct MeshChannelReliability *rel = cls;
687 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
688 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
691 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RE-CREATE\n");
692 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
694 if (rel == rel->ch->root_rel)
696 send_create (rel->ch);
698 else if (rel == rel->ch->dest_rel)
700 send_ack (rel->ch, GNUNET_YES);
711 * Message has been sent: start retransmission timer.
713 * @param cls Closure (queue structure).
715 * @param q Queue handler (no longer valid).
716 * @param type Type of message.
717 * @param size Size of the message.
720 ch_message_sent (void *cls,
721 struct MeshTunnel3 *t,
722 struct MeshTunnel3Queue *q,
723 uint16_t type, size_t size)
725 struct MeshChannelQueue *ch_q = cls;
726 struct MeshReliableMessage *copy = ch_q->copy;
727 struct MeshChannelReliability *rel;
731 case GNUNET_MESSAGE_TYPE_MESH_DATA:
732 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! SENT DATA MID %u\n", copy->mid);
733 GNUNET_assert (ch_q == copy->q);
734 copy->timestamp = GNUNET_TIME_absolute_get ();
736 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
738 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! scheduling retry %u\n");
739 if (0 != rel->expected_delay.rel_value_us)
741 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! delay != 0\n");
743 GNUNET_TIME_relative_multiply (rel->expected_delay,
744 MESH_RETRANSMIT_MARGIN);
748 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! delay 0\n");
749 rel->retry_timer = MESH_RETRANSMIT_TIME;
751 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! using delay %s\n",
752 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
755 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
756 &channel_retransmit_message, rel);
760 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! retry task %u\n", rel->retry_task);
766 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
767 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
768 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
769 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! SENT %s\n", GM_m2s (ch_q->type));
771 GNUNET_assert (rel->uniq == ch_q);
774 if (MESH_CHANNEL_READY != rel->ch->state
775 && GNUNET_MESSAGE_TYPE_MESH_DATA_ACK != type)
777 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == rel->retry_task);
778 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! STD BACKOFF %s\n",
779 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
781 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
782 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
783 &channel_recreate, rel);
797 * send a channel create message.
799 * @param ch Channel for which to send.
802 send_create (struct MeshChannel *ch)
804 struct GNUNET_MESH_ChannelCreate msgcc;
806 msgcc.header.size = htons (sizeof (msgcc));
807 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
808 msgcc.chid = htonl (ch->gid);
809 msgcc.port = htonl (ch->port);
810 msgcc.opt = htonl (channel_get_options (ch));
812 GMCH_send_prebuilt_message (&msgcc.header, ch, GNUNET_YES, NULL);
817 * Confirm we got a channel create or FWD ack.
819 * @param ch The channel to confirm.
820 * @param fwd Should we send a FWD ACK? (going dest->root)
823 send_ack (struct MeshChannel *ch, int fwd)
825 struct GNUNET_MESH_ChannelManage msg;
827 msg.header.size = htons (sizeof (msg));
828 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
829 LOG (GNUNET_ERROR_TYPE_DEBUG,
830 " sending channel %s ack for channel %s\n",
831 GM_f2s (fwd), GMCH_2s (ch));
833 msg.chid = htonl (ch->gid);
834 GMCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
839 * Send a message and don't keep any info about it: we won't need to cancel it
842 * @param msg Header of the message to fire away.
843 * @param ch Channel on which the message should go.
844 * @param force Is this a forced (undroppable) message?
847 fire_and_forget (const struct GNUNET_MessageHeader *msg,
848 struct MeshChannel *ch,
851 GNUNET_break (NULL == GMT_send_prebuilt_message (msg, ch->t, ch, force,
857 * Notify that a channel create didn't succeed.
859 * @param ch The channel to reject.
862 send_nack (struct MeshChannel *ch)
864 struct GNUNET_MESH_ChannelManage msg;
866 msg.header.size = htons (sizeof (msg));
867 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK);
868 LOG (GNUNET_ERROR_TYPE_DEBUG,
869 " sending channel NACK for channel %s\n",
872 msg.chid = htonl (ch->gid);
873 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
878 * Notify a client that the channel is no longer valid.
880 * @param ch Channel that is destroyed.
881 * @param local_only Should we avoid sending it to other peers?
884 send_destroy (struct MeshChannel *ch, int local_only)
886 struct GNUNET_MESH_ChannelManage msg;
888 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
889 msg.header.size = htons (sizeof (msg));
890 msg.chid = htonl (ch->gid);
892 /* If root is not NULL, notify.
893 * If it's NULL, check lid_root. When a local destroy comes in, root
894 * is set to NULL but lid_root is left untouched. In this case, do nothing,
895 * the client is the one who reuqested the channel to be destroyed.
897 if (NULL != ch->root)
898 GML_send_channel_destroy (ch->root, ch->lid_root);
899 else if (0 == ch->lid_root && GNUNET_NO == local_only)
900 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
902 if (NULL != ch->dest)
903 GML_send_channel_destroy (ch->dest, ch->lid_dest);
904 else if (0 == ch->lid_dest && GNUNET_NO == local_only)
905 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_YES, NULL);
910 * Destroy all reliable messages queued for a channel,
911 * during a channel destruction.
912 * Frees the reliability structure itself.
914 * @param rel Reliability data for a channel.
917 channel_rel_free_all (struct MeshChannelReliability *rel)
919 struct MeshReliableMessage *copy;
920 struct MeshReliableMessage *next;
925 for (copy = rel->head_recv; NULL != copy; copy = next)
928 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
929 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE BATCH RECV %p\n", copy);
932 for (copy = rel->head_sent; NULL != copy; copy = next)
935 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
936 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE BATCH %p\n", copy);
939 if (NULL != rel->uniq && NULL != rel->uniq->q)
940 GMT_cancel (rel->uniq->q);
941 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
943 GNUNET_SCHEDULER_cancel (rel->retry_task);
944 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
951 * Mark future messages as ACK'd.
953 * @param rel Reliability data.
954 * @param msg DataACK message with a bitfield of future ACK'd messages.
957 channel_rel_free_sent (struct MeshChannelReliability *rel,
958 const struct GNUNET_MESH_DataACK *msg)
960 struct MeshReliableMessage *copy;
961 struct MeshReliableMessage *next;
968 bitfield = msg->futures;
969 mid = ntohl (msg->mid);
970 LOG (GNUNET_ERROR_TYPE_DEBUG,
971 "!!! free_sent_reliable %u %llX\n",
973 LOG (GNUNET_ERROR_TYPE_DEBUG,
974 " rel %p, head %p\n",
975 rel, rel->head_sent);
976 for (i = 0, copy = rel->head_sent;
977 i < 64 && NULL != copy && 0 != bitfield;
980 LOG (GNUNET_ERROR_TYPE_DEBUG,
981 " trying bit %u (mid %u)\n",
984 if (0 == (bitfield & mask))
987 LOG (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
988 /* Bit was set, clear the bit from the bitfield */
991 /* The i-th bit was set. Do we have that copy? */
992 /* Skip copies with mid < target */
993 target = mid + i + 1;
994 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
995 while (NULL != copy && GM_is_pid_bigger (target, copy->mid))
998 /* Did we run out of copies? (previously freed, it's ok) */
1001 LOG (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
1005 /* Did we overshoot the target? (previously freed, it's ok) */
1006 if (GM_is_pid_bigger (copy->mid, target))
1008 LOG (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
1012 /* Now copy->mid == target, free it */
1014 GNUNET_break (GNUNET_YES != rel_message_free (copy, GNUNET_YES));
1017 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
1022 * Destroy a reliable message after it has been acknowledged, either by
1023 * direct mid ACK or bitfield. Updates the appropriate data structures and
1024 * timers and frees all memory.
1026 * @param copy Message that is no longer needed: remote peer got it.
1027 * @param update_time Is the timing information relevant?
1028 * If this message is ACK in a batch the timing information
1029 * is skewed by the retransmission, count only for the
1030 * retransmitted message.
1032 * @return #GNUNET_YES if channel was destroyed as a result of the call,
1033 * #GNUNET_NO otherwise.
1036 rel_message_free (struct MeshReliableMessage *copy, int update_time)
1038 struct MeshChannelReliability *rel;
1039 struct GNUNET_TIME_Relative time;
1042 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
1045 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
1046 if (0 == rel->expected_delay.rel_value_us)
1047 rel->expected_delay = time;
1050 rel->expected_delay.rel_value_us *= 7;
1051 rel->expected_delay.rel_value_us += time.rel_value_us;
1052 rel->expected_delay.rel_value_us /= 8;
1054 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
1055 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
1056 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
1057 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
1059 rel->retry_timer = rel->expected_delay;
1063 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! batch free, ignoring timing\n");
1065 rel->ch->pending_messages--;
1066 if (NULL != copy->q)
1068 GMT_cancel (copy->q->q);
1069 /* copy->q is set to NULL by ch_message_sent */
1071 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
1072 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE %p\n", copy);
1075 if (GNUNET_NO != rel->ch->destroy && 0 == rel->ch->pending_messages)
1077 struct MeshTunnel3 *t = rel->ch->t;
1078 GMCH_destroy (rel->ch);
1079 GMT_destroy_if_empty (t);
1087 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
1089 * @param ch Channel to mark as ready.
1090 * @param fwd Was the ACK message a FWD ACK? (dest->root, SYNACK)
1093 channel_confirm (struct MeshChannel *ch, int fwd)
1095 struct MeshChannelReliability *rel;
1096 enum MeshChannelState oldstate;
1098 LOG (GNUNET_ERROR_TYPE_DEBUG,
1099 " channel confirm %s %s:%X\n",
1100 GM_f2s (fwd), GMT_2s (ch->t), ch->gid);
1101 oldstate = ch->state;
1102 ch->state = MESH_CHANNEL_READY;
1104 rel = fwd ? ch->root_rel : ch->dest_rel;
1105 rel->client_ready = GNUNET_YES;
1106 LOG (GNUNET_ERROR_TYPE_DEBUG,
1107 " !! retry timer confirm %s\n",
1108 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer, GNUNET_NO));
1109 rel->expected_delay = rel->retry_timer;
1110 if (GMT_get_connections_buffer (ch->t) > 0 || GMT_is_loopback (ch->t))
1111 send_client_ack (ch, fwd);
1113 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
1115 GNUNET_SCHEDULER_cancel (rel->retry_task);
1116 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
1118 else if (NULL != rel->uniq)
1120 GMT_cancel (rel->uniq->q);
1121 /* ch_sent_message will free and NULL uniq */
1125 if (GNUNET_NO == is_loopback (ch))
1127 /* We SHOULD have been trying to retransmit this! */
1128 GNUNET_break (oldstate == MESH_CHANNEL_READY);
1132 /* In case of a FWD ACK (SYNACK) send a BCK ACK (ACK). */
1133 if (GNUNET_YES == fwd)
1134 send_ack (ch, GNUNET_NO);
1139 * Save a copy to retransmit in case it gets lost.
1141 * Initializes all needed callbacks and timers.
1143 * @param ch Channel this message goes on.
1144 * @param msg Message to copy.
1145 * @param fwd Is this fwd traffic?
1147 static struct MeshReliableMessage *
1148 channel_save_copy (struct MeshChannel *ch,
1149 const struct GNUNET_MessageHeader *msg,
1152 struct MeshChannelReliability *rel;
1153 struct MeshReliableMessage *copy;
1158 rel = fwd ? ch->root_rel : ch->dest_rel;
1159 mid = rel->mid_send - 1;
1160 type = ntohs (msg->type);
1161 size = ntohs (msg->size);
1163 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u %s\n", mid, GM_m2s (type));
1164 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
1165 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", copy);
1169 memcpy (©[1], msg, size);
1170 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
1171 ch->pending_messages++;
1178 * Create a new channel.
1180 * @param t Tunnel this channel is in.
1181 * @param owner Client that owns the channel, NULL for foreign channels.
1182 * @param lid_root Local ID for root client.
1184 * @return A new initialized channel. NULL on error.
1186 static struct MeshChannel *
1187 channel_new (struct MeshTunnel3 *t,
1188 struct MeshClient *owner,
1189 MESH_ChannelNumber lid_root)
1191 struct MeshChannel *ch;
1193 ch = GNUNET_new (struct MeshChannel);
1195 ch->lid_root = lid_root;
1198 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
1202 ch->gid = GMT_get_next_chid (t);
1203 GML_channel_add (owner, lid_root, ch);
1205 GMT_add_channel (t, ch);
1212 * Handle a loopback message: call the appropriate handler for the message type.
1214 * @param ch Channel this message is on.
1215 * @param msgh Message header.
1216 * @param fwd Is this FWD traffic?
1219 handle_loopback (struct MeshChannel *ch,
1220 const struct GNUNET_MessageHeader *msgh,
1225 type = ntohs (msgh->type);
1226 LOG (GNUNET_ERROR_TYPE_DEBUG,
1227 "Loopback %s %s message!\n",
1228 GM_f2s (fwd), GM_m2s (type));
1232 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1233 /* Don't send hop ACK, wait for client to ACK */
1234 GMCH_handle_data (ch, (struct GNUNET_MESH_Data *) msgh, fwd);
1237 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1238 GMCH_handle_data_ack (ch, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1241 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1242 GMCH_handle_create (ch->t,
1243 (struct GNUNET_MESH_ChannelCreate *) msgh);
1246 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1247 GMCH_handle_ack (ch,
1248 (struct GNUNET_MESH_ChannelManage *) msgh,
1252 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1253 GMCH_handle_nack (ch);
1256 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1257 GMCH_handle_destroy (ch,
1258 (struct GNUNET_MESH_ChannelManage *) msgh,
1263 GNUNET_break_op (0);
1264 LOG (GNUNET_ERROR_TYPE_DEBUG,
1265 "end-to-end message not known (%u)\n",
1266 ntohs (msgh->type));
1272 /******************************************************************************/
1273 /******************************** API ***********************************/
1274 /******************************************************************************/
1277 * Destroy a channel and free all resources.
1279 * @param ch Channel to destroy.
1282 GMCH_destroy (struct MeshChannel *ch)
1284 struct MeshClient *c;
1288 if (2 == ch->destroy)
1289 return; /* recursive call */
1292 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying channel %s:%u\n",
1293 GMT_2s (ch->t), ch->gid);
1299 GML_channel_remove (c, ch->lid_root, ch);
1305 GML_channel_remove (c, ch->lid_dest, ch);
1308 channel_rel_free_all (ch->root_rel);
1309 channel_rel_free_all (ch->dest_rel);
1311 GMT_remove_channel (ch->t, ch);
1312 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
1321 * @param ch Channel.
1326 GMCH_get_id (const struct MeshChannel *ch)
1333 * Get the channel tunnel.
1335 * @param ch Channel to get the tunnel from.
1337 * @return tunnel of the channel.
1339 struct MeshTunnel3 *
1340 GMCH_get_tunnel (const struct MeshChannel *ch)
1347 * Get free buffer space towards the client on a specific channel.
1349 * @param ch Channel.
1350 * @param fwd Is query about FWD traffic?
1352 * @return Free buffer space [0 - 64]
1355 GMCH_get_buffer (struct MeshChannel *ch, int fwd)
1357 struct MeshChannelReliability *rel;
1359 rel = fwd ? ch->dest_rel : ch->root_rel;
1361 /* If rel is NULL it means that the end is not yet created,
1362 * most probably is a loopback channel at the point of sending
1363 * the ChannelCreate to itself.
1368 return (64 - rel->n_recv);
1373 * Get flow control status of end point: is client allow to send?
1375 * @param ch Channel.
1376 * @param fwd Is query about FWD traffic? (Request root status).
1378 * @return #GNUNET_YES if client is allowed to send us data.
1381 GMCH_get_allowed (struct MeshChannel *ch, int fwd)
1383 struct MeshChannelReliability *rel;
1385 rel = fwd ? ch->root_rel : ch->dest_rel;
1389 /* Probably shutting down: root/dest NULL'ed to mark disconnection */
1390 GNUNET_break (GNUNET_NO != ch->destroy);
1394 return rel->client_allowed;
1399 * Is the root client for this channel on this peer?
1401 * @param ch Channel.
1402 * @param fwd Is this for fwd traffic?
1404 * @return #GNUNET_YES in case it is.
1407 GMCH_is_origin (struct MeshChannel *ch, int fwd)
1409 struct MeshClient *c;
1411 c = fwd ? ch->root : ch->dest;
1417 * Is the destination client for this channel on this peer?
1419 * @param ch Channel.
1420 * @param fwd Is this for fwd traffic?
1422 * @return #GNUNET_YES in case it is.
1425 GMCH_is_terminal (struct MeshChannel *ch, int fwd)
1427 struct MeshClient *c;
1429 c = fwd ? ch->dest : ch->root;
1435 * Send an end-to-end ACK message for the most recent in-sequence payload.
1437 * If channel is not reliable, do nothing.
1439 * @param ch Channel this is about.
1440 * @param fwd Is for FWD traffic? (ACK dest->owner)
1443 GMCH_send_data_ack (struct MeshChannel *ch, int fwd)
1445 struct GNUNET_MESH_DataACK msg;
1446 struct MeshChannelReliability *rel;
1447 struct MeshReliableMessage *copy;
1452 if (GNUNET_NO == ch->reliable)
1456 rel = fwd ? ch->dest_rel : ch->root_rel;
1457 ack = rel->mid_recv - 1;
1458 LOG (GNUNET_ERROR_TYPE_DEBUG,
1459 " !! Send DATA_ACK for %u\n",
1462 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
1463 msg.header.size = htons (sizeof (msg));
1464 msg.chid = htonl (ch->gid);
1466 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
1468 if (copy->type != GNUNET_MESSAGE_TYPE_MESH_DATA)
1470 LOG (GNUNET_ERROR_TYPE_DEBUG,
1471 "!! Type %s, expected DATA\n",
1472 GM_m2s (copy->type));
1475 if (copy->mid == ack + 1)
1480 delta = copy->mid - (ack + 1);
1483 mask = 0x1LL << delta;
1484 msg.futures |= mask;
1485 LOG (GNUNET_ERROR_TYPE_DEBUG,
1486 " !! setting bit for %u (delta %u) (%llX) -> %llX\n",
1487 copy->mid, delta, mask, msg.futures);
1489 msg.mid = htonl (ack);
1490 LOG (GNUNET_ERROR_TYPE_DEBUG,
1491 "!!! ACK for %u, futures %llX\n",
1494 GMCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
1495 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
1500 * Allow a client to send us more data, in case it was choked.
1502 * @param ch Channel.
1503 * @param fwd Is this about FWD traffic? (Root client).
1506 GMCH_allow_client (struct MeshChannel *ch, int fwd)
1508 struct MeshChannelReliability *rel;
1509 unsigned int buffer;
1511 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH allow\n");
1513 if (MESH_CHANNEL_READY != ch->state)
1515 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel not ready yet!\n");
1519 if (GNUNET_YES == ch->reliable)
1521 rel = fwd ? ch->root_rel : ch->dest_rel;
1524 GNUNET_break (GNUNET_NO != ch->destroy);
1527 if (NULL != rel->head_sent)
1529 if (64 <= rel->mid_send - rel->head_sent->mid)
1531 LOG (GNUNET_ERROR_TYPE_DEBUG, " too big MID gap! Wait for ACK.\n");
1535 LOG (GNUNET_ERROR_TYPE_DEBUG, " gap ok: %u - %u\n",
1536 rel->head_sent->mid, rel->mid_send);
1540 LOG (GNUNET_ERROR_TYPE_DEBUG, " head sent is NULL\n");
1544 if (is_loopback (ch))
1545 buffer = GMCH_get_buffer (ch, fwd);
1547 buffer = GMT_get_connections_buffer (ch->t);
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, " no buffer space.\n");
1555 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space %u, allowing\n", buffer);
1556 send_client_ack (ch, fwd);
1563 * @param ch Channel.
1566 GMCH_debug (struct MeshChannel *ch)
1570 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
1573 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X (%p)\n",
1574 GMT_2s (ch->t), ch->gid, ch);
1575 LOG (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
1576 ch->root, ch->root_rel);
1577 if (NULL != ch->root)
1579 LOG (GNUNET_ERROR_TYPE_DEBUG, " cli %s\n", GML_2s (ch->root));
1580 LOG (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
1581 ch->root_rel->client_ready ? "YES" : "NO");
1582 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
1584 LOG (GNUNET_ERROR_TYPE_DEBUG, " dest %p/%p\n",
1585 ch->dest, ch->dest_rel);
1586 if (NULL != ch->dest)
1588 LOG (GNUNET_ERROR_TYPE_DEBUG, " cli %s\n", GML_2s (ch->dest));
1589 LOG (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
1590 ch->dest_rel->client_ready ? "YES" : "NO");
1591 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
1597 * Handle an ACK given by a client.
1599 * Mark client as ready and send him any buffered data we could have for him.
1601 * @param ch Channel.
1602 * @param fwd Is this a "FWD ACK"? (FWD ACKs are sent by dest and go BCK)
1605 GMCH_handle_local_ack (struct MeshChannel *ch, int fwd)
1607 struct MeshChannelReliability *rel;
1608 struct MeshClient *c;
1610 rel = fwd ? ch->dest_rel : ch->root_rel;
1611 c = fwd ? ch->dest : ch->root;
1613 rel->client_ready = GNUNET_YES;
1614 send_client_buffered_data (ch, c, fwd);
1615 if (is_loopback (ch))
1617 unsigned int buffer;
1619 buffer = GMCH_get_buffer (ch, fwd);
1621 GMCH_allow_client (ch, fwd);
1625 GMT_send_connection_acks (ch->t);
1630 * Handle data given by a client.
1632 * Check whether the client is allowed to send in this tunnel, save if channel
1633 * is reliable and send an ACK to the client if there is still buffer space
1636 * @param ch Channel.
1637 * @param c Client which sent the data.
1638 * @param message Message.
1639 * @param fwd Is this a FWD data?
1641 * @return GNUNET_OK if everything goes well, GNUNET_SYSERR in case of en error.
1644 GMCH_handle_local_data (struct MeshChannel *ch,
1645 struct MeshClient *c,
1646 struct GNUNET_MessageHeader *message,
1649 struct MeshChannelReliability *rel;
1650 struct GNUNET_MESH_Data *payload;
1651 size_t size = ntohs (message->size);
1652 uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
1653 unsigned char cbuf[p2p_size];
1655 /* Is the client in the channel? */
1662 GNUNET_break_op (0);
1663 return GNUNET_SYSERR;
1666 rel = fwd ? ch->root_rel : ch->dest_rel;
1668 if (GNUNET_NO == rel->client_allowed)
1670 GNUNET_break_op (0);
1671 return GNUNET_SYSERR;
1674 rel->client_allowed = GNUNET_NO;
1676 /* Ok, everything is correct, send the message. */
1677 payload = (struct GNUNET_MESH_Data *) cbuf;
1678 payload->mid = htonl (rel->mid_send);
1680 memcpy (&payload[1], message, size);
1681 payload->header.size = htons (p2p_size);
1682 payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
1683 payload->chid = htonl (ch->gid);
1684 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
1685 GMCH_send_prebuilt_message (&payload->header, ch, fwd, NULL);
1687 if (is_loopback (ch))
1689 if (GMCH_get_buffer (ch, fwd) > 0)
1690 GMCH_allow_client (ch, fwd);
1695 if (GMT_get_connections_buffer (ch->t) > 0)
1697 GMCH_allow_client (ch, fwd);
1705 * Handle a channel destroy requested by a client.
1707 * Destroy the channel and the tunnel in case this was the last channel.
1709 * @param ch Channel.
1710 * @param c Client that requested the destruction (to avoid notifying him).
1711 * @param is_root Is the request coming from root?
1714 GMCH_handle_local_destroy (struct MeshChannel *ch,
1715 struct MeshClient *c,
1718 struct MeshTunnel3 *t;
1720 ch->destroy = GNUNET_YES;
1721 /* Cleanup after the tunnel */
1722 if (GNUNET_NO == is_root && c == ch->dest)
1724 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is destination.\n", GML_2s (c));
1725 GML_client_delete_channel (c, ch, ch->lid_dest);
1728 if (GNUNET_YES == is_root && c == ch->root)
1730 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is owner.\n", GML_2s (c));
1731 GML_client_delete_channel (c, ch, ch->lid_root);
1736 send_destroy (ch, GNUNET_NO);
1737 if (0 == ch->pending_messages)
1740 GMT_destroy_if_empty (t);
1746 * Handle a channel create requested by a client.
1748 * Create the channel and the tunnel in case this was the first0 channel.
1750 * @param c Client that requested the creation (will be the root).
1751 * @param msg Create Channel message.
1753 * @return GNUNET_OK if everything went fine, GNUNET_SYSERR otherwise.
1756 GMCH_handle_local_create (struct MeshClient *c,
1757 struct GNUNET_MESH_ChannelMessage *msg)
1759 struct MeshChannel *ch;
1760 struct MeshTunnel3 *t;
1761 struct MeshPeer *peer;
1762 MESH_ChannelNumber chid;
1764 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
1765 GNUNET_i2s (&msg->peer), ntohl (msg->port));
1766 chid = ntohl (msg->channel_id);
1768 /* Sanity check for duplicate channel IDs */
1769 if (NULL != GML_channel_get (c, chid))
1772 return GNUNET_SYSERR;
1775 peer = GMP_get (&msg->peer);
1776 GMP_add_tunnel (peer);
1777 t = GMP_get_tunnel (peer);
1779 if (GMP_get_short_id (peer) == myid)
1781 GMT_change_cstate (t, MESH_TUNNEL3_READY);
1788 /* Create channel */
1789 ch = channel_new (t, c, chid);
1793 return GNUNET_SYSERR;
1795 ch->port = ntohl (msg->port);
1796 channel_set_options (ch, ntohl (msg->opt));
1798 /* In unreliable channels, we'll use the DLL to buffer BCK data */
1799 ch->root_rel = GNUNET_new (struct MeshChannelReliability);
1800 ch->root_rel->ch = ch;
1801 ch->root_rel->retry_timer = MESH_RETRANSMIT_TIME;
1802 ch->root_rel->expected_delay.rel_value_us = 0;
1804 LOG (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s\n", GMCH_2s (ch));
1813 * Handler for mesh network payload traffic.
1815 * @param ch Channel for the message.
1816 * @param msg Unencryted data message.
1817 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1818 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1819 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1820 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1823 GMCH_handle_data (struct MeshChannel *ch,
1824 const struct GNUNET_MESH_Data *msg,
1827 struct MeshChannelReliability *rel;
1828 struct MeshClient *c;
1831 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1832 if (GNUNET_SYSERR == fwd)
1834 if (is_loopback (ch))
1836 /* It is a loopback channel after all... */
1840 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
1843 /* Initialize FWD/BCK data */
1844 c = fwd ? ch->dest : ch->root;
1845 rel = fwd ? ch->dest_rel : ch->root_rel;
1853 if (MESH_CHANNEL_READY != ch->state)
1855 if (GNUNET_NO == fwd)
1857 /* If we are the root, this means the other peer has sent traffic before
1858 * receiving our ACK. Even if the SYNACK goes missing, no traffic should
1859 * be sent before the ACK.
1861 GNUNET_break_op (0);
1864 /* If we are the dest, this means that the SYNACK got to the root but
1865 * the ACK went missing. Treat this as an ACK.
1867 channel_confirm (ch, GNUNET_NO);
1870 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
1872 mid = ntohl (msg->mid);
1873 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! got mid %u\n", mid);
1875 if (GNUNET_NO == ch->reliable ||
1876 ( !GM_is_pid_bigger (rel->mid_recv, mid) &&
1877 GM_is_pid_bigger (rel->mid_recv + 64, mid) ) )
1879 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
1880 if (GNUNET_YES == ch->reliable)
1882 /* Is this the exact next expected messasge? */
1883 if (mid == rel->mid_recv)
1885 LOG (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
1887 send_client_data (ch, msg, fwd);
1891 LOG (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
1892 add_buffered_data (msg, rel);
1897 /* Tunnel is unreliable: send to clients directly */
1898 /* FIXME: accept Out Of Order traffic */
1899 rel->mid_recv = mid + 1;
1900 send_client_data (ch, msg, fwd);
1905 GNUNET_break_op (GM_is_pid_bigger (rel->mid_recv, mid));
1906 LOG (GNUNET_ERROR_TYPE_DEBUG,
1907 " !!! MID %u not expected (%u - %u), dropping!\n",
1908 mid, rel->mid_recv, rel->mid_recv + 63);
1911 GMCH_send_data_ack (ch, fwd);
1916 * Handler for mesh network traffic end-to-end ACKs.
1918 * @param ch Channel on which we got this message.
1919 * @param msg Data message.
1920 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1921 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1922 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1923 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1926 GMCH_handle_data_ack (struct MeshChannel *ch,
1927 const struct GNUNET_MESH_DataACK *msg,
1930 struct MeshChannelReliability *rel;
1931 struct MeshReliableMessage *copy;
1932 struct MeshReliableMessage *next;
1936 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1937 if (GNUNET_SYSERR == fwd)
1939 if (is_loopback (ch))
1941 /* It is a loopback channel after all... */
1945 /* Inverted: if message came 'FWD' is a 'BCK ACK'. */
1946 fwd = (NULL != ch->dest) ? GNUNET_NO : GNUNET_YES;
1949 ack = ntohl (msg->mid);
1950 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
1951 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
1953 if (GNUNET_YES == fwd)
1963 GNUNET_break_op (0);
1967 /* Free ACK'd copies: no need to retransmit those anymore */
1968 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
1970 if (GM_is_pid_bigger (copy->mid, ack))
1972 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
1973 channel_rel_free_sent (rel, msg);
1977 LOG (GNUNET_ERROR_TYPE_DEBUG, " !! id %u\n", copy->mid);
1979 if (GNUNET_YES == rel_message_free (copy, GNUNET_YES))
1983 /* ACK client if needed */
1984 GMCH_allow_client (ch, fwd);
1986 /* If some message was free'd, update the retransmission delay */
1987 if (GNUNET_YES == work)
1989 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
1991 GNUNET_SCHEDULER_cancel (rel->retry_task);
1992 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
1993 if (NULL != rel->head_sent && NULL == rel->head_sent->q)
1995 struct GNUNET_TIME_Absolute new_target;
1996 struct GNUNET_TIME_Relative delay;
1998 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
1999 MESH_RETRANSMIT_MARGIN);
2000 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
2002 delay = GNUNET_TIME_absolute_get_remaining (new_target);
2004 GNUNET_SCHEDULER_add_delayed (delay,
2005 &channel_retransmit_message,
2009 else /* work was done but no task was pending? shouldn't happen! */
2018 * Handler for channel create messages.
2020 * Does not have fwd parameter because it's always 'FWD': channel is incoming.
2022 * @param t Tunnel this channel will be in.
2023 * @param msg Channel crate message.
2025 struct MeshChannel *
2026 GMCH_handle_create (struct MeshTunnel3 *t,
2027 const struct GNUNET_MESH_ChannelCreate *msg)
2029 MESH_ChannelNumber chid;
2030 struct MeshChannel *ch;
2031 struct MeshClient *c;
2034 chid = ntohl (msg->chid);
2035 ch = GMT_get_channel (t, chid);
2038 /* Create channel */
2039 ch = channel_new (t, NULL, 0);
2041 channel_set_options (ch, ntohl (msg->opt));
2042 new_channel = GNUNET_YES;
2046 new_channel = GNUNET_NO;
2049 if (GNUNET_YES == new_channel || GMT_is_loopback (t))
2051 /* Find a destination client */
2052 ch->port = ntohl (msg->port);
2053 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", ch->port);
2054 c = GML_client_get_by_port (ch->port);
2057 LOG (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
2058 if (is_loopback (ch))
2060 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback: destroy on handler\n");
2065 LOG (GNUNET_ERROR_TYPE_DEBUG, " not loopback: destroy now\n");
2073 LOG (GNUNET_ERROR_TYPE_DEBUG, " client %p has port registered\n", c);
2076 add_destination (ch, c);
2077 if (GNUNET_YES == ch->reliable)
2078 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
2080 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Not Reliable\n");
2082 send_client_create (ch);
2083 ch->state = MESH_CHANNEL_SENT;
2087 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate create channel\n");
2089 send_ack (ch, GNUNET_YES);
2096 * Handler for channel NACK messages.
2098 * NACK messages always go dest -> root, no need for 'fwd' or 'msg' parameter.
2100 * @param ch Channel.
2103 GMCH_handle_nack (struct MeshChannel *ch)
2105 send_client_nack (ch);
2111 * Handler for channel ack messages.
2113 * @param ch Channel.
2114 * @param msg Message.
2115 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2116 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2117 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2118 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2121 GMCH_handle_ack (struct MeshChannel *ch,
2122 const struct GNUNET_MESH_ChannelManage *msg,
2125 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2126 if (GNUNET_SYSERR == fwd)
2128 if (is_loopback (ch))
2130 /* It is a loopback channel after all... */
2134 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2137 channel_confirm (ch, !fwd);
2142 * Handler for channel destroy messages.
2144 * @param ch Channel to be destroyed of.
2145 * @param msg Message.
2146 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2147 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2148 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2149 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2152 GMCH_handle_destroy (struct MeshChannel *ch,
2153 const struct GNUNET_MESH_ChannelManage *msg,
2156 struct MeshTunnel3 *t;
2158 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2159 if (GNUNET_SYSERR == fwd)
2161 if (is_loopback (ch))
2163 /* It is a loopback channel after all... */
2167 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2171 if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
2173 /* Not for us (don't destroy twice a half-open loopback channel) */
2178 send_destroy (ch, GNUNET_YES);
2180 GMT_destroy_if_empty (t);
2185 * Sends an already built message on a channel.
2187 * If the channel is on a loopback tunnel, notifies the appropriate destination
2190 * On a normal channel passes the message to the tunnel for encryption and
2191 * sending on a connection.
2193 * This function DOES NOT save the message for retransmission.
2195 * @param message Message to send. Function makes a copy of it.
2196 * @param ch Channel on which this message is transmitted.
2197 * @param fwd Is this a fwd message?
2198 * @param existing_copy This is a retransmission, don't save a copy.
2201 GMCH_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2202 struct MeshChannel *ch, int fwd,
2203 void *existing_copy)
2205 struct MeshChannelQueue *q;
2208 type = ntohs (message->type);
2209 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH Send %s %s on channel %s\n",
2210 GM_f2s (fwd), GM_m2s (type),
2213 if (GMT_is_loopback (ch->t))
2215 handle_loopback (ch, message, fwd);
2221 case GNUNET_MESSAGE_TYPE_MESH_DATA:
2223 if (GNUNET_YES == ch->reliable)
2225 q = GNUNET_new (struct MeshChannelQueue);
2227 if (NULL == existing_copy)
2228 q->copy = channel_save_copy (ch, message, fwd);
2231 q->copy = (struct MeshReliableMessage *) existing_copy;
2232 if (NULL != q->copy->q)
2234 /* Last retransmission was queued but not yet sent!
2235 * This retransmission was scheduled by a ch_message_sent which
2236 * followed a very fast RTT, so the tiny delay made the
2237 * retransmission function to execute before the previous
2238 * retransmitted message even had a chance to leave the peer.
2239 * Cancel this message and wait until the pending
2240 * retransmission leaves the peer and ch_message_sent starts
2241 * the timer for the next one.
2244 LOG (GNUNET_ERROR_TYPE_DEBUG,
2245 " exisitng copy not yet transmitted!\n");
2248 LOG (GNUNET_ERROR_TYPE_DEBUG,
2249 " using existing copy: %p {r:%p q:%p t:%u}\n",
2251 q->copy->rel, q->copy->q, q->copy->type);
2253 LOG (GNUNET_ERROR_TYPE_DEBUG, " new q: %p\n", q);
2255 q->q = GMT_send_prebuilt_message (message, ch->t, ch,
2256 NULL != existing_copy,
2257 &ch_message_sent, q);
2258 /* q itself is stored in copy */
2262 fire_and_forget (message, ch, GNUNET_NO);
2267 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
2268 if (GNUNET_YES == fwd)
2270 /* BCK ACK (going FWD) is just a response for a SYNACK, don't keep*/
2271 fire_and_forget (message, ch, GNUNET_YES);
2275 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2276 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
2277 q = GNUNET_new (struct MeshChannelQueue);
2279 q->rel = fwd ? ch->root_rel : ch->dest_rel;
2280 if (NULL != q->rel->uniq)
2282 if (NULL != q->rel->uniq->q)
2284 GMT_cancel (q->rel->uniq->q);
2285 /* ch_message_sent is called, freeing and NULLing uniq */
2289 GNUNET_free (q->rel->uniq);
2292 q->q = GMT_send_prebuilt_message (message, ch->t, ch, GNUNET_YES,
2293 &ch_message_sent, q);
2298 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
2299 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
2300 fire_and_forget (message, ch, GNUNET_YES);
2306 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s unknown!\n", GM_m2s (type));
2307 fire_and_forget (message, ch, GNUNET_YES);
2313 * Get the static string for identification of the channel.
2315 * @param ch Channel.
2317 * @return Static string with the channel IDs.
2320 GMCH_2s (const struct MeshChannel *ch)
2322 static char buf[64];
2325 return "(NULL Channel)";
2327 sprintf (buf, "%s:%u gid:%X (%X / %X)",
2328 GMT_2s (ch->t), ch->port, ch->gid, ch->lid_root, ch->lid_dest);