2 This file is part of GNUnet
3 Copyright (C) 2010-2015 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.
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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.
22 * @file transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP transport protocol
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 * @author Matthias Wachs
29 #include "plugin_transport_udp.h"
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_util_lib.h"
32 #include "gnunet_fragmentation_lib.h"
33 #include "gnunet_nat_lib.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_resolver_service.h"
36 #include "gnunet_signatures.h"
37 #include "gnunet_constants.h"
38 #include "gnunet_statistics_service.h"
39 #include "gnunet_transport_service.h"
40 #include "gnunet_transport_plugin.h"
41 #include "transport.h"
43 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
45 #define UDP_SESSION_TIME_OUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
48 * Number of messages we can defragment in parallel. We only really
49 * defragment 1 message at a time, but if messages get re-ordered, we
50 * may want to keep knowledge about the previous message to avoid
51 * discarding the current message in favor of a single fragment of a
52 * previous message. 3 should be good since we don't expect massive
53 * message reorderings with UDP.
55 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
58 * We keep a defragmentation queue per sender address. How many
59 * sender addresses do we support at the same time? Memory consumption
60 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
61 * value. (So 128 corresponds to 12 MB and should suffice for
62 * connecting to roughly 128 peers via UDP).
64 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
68 * Closure for #append_port().
70 struct PrettyPrinterContext
75 struct PrettyPrinterContext *next;
80 struct PrettyPrinterContext *prev;
85 struct Plugin *plugin;
90 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
93 * Function to call with the result.
95 GNUNET_TRANSPORT_AddressStringCallback asc;
105 struct GNUNET_SCHEDULER_Task *timeout_task;
108 * Is this an IPv6 address?
118 * Port to add after the IP address.
126 * Session with another peer.
131 * Which peer is this session for?
133 struct GNUNET_PeerIdentity target;
136 * Plugin this session belongs to.
138 struct Plugin *plugin;
141 * Context for dealing with fragments.
143 struct UDP_FragmentationContext *frag_ctx;
146 * Desired delay for next sending we send to other peer
148 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
151 * Desired delay for next sending we received from other peer
153 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
156 * Session timeout task
158 struct GNUNET_SCHEDULER_Task *timeout_task;
161 * When does this session time out?
163 struct GNUNET_TIME_Absolute timeout;
166 * expected delay for ACKs
168 struct GNUNET_TIME_Relative last_expected_ack_delay;
171 * desired delay between UDP messages
173 struct GNUNET_TIME_Relative last_expected_msg_delay;
176 * Address metrics (as set by the "update_address_metrics" by
179 struct GNUNET_ATS_Information ats;
184 struct GNUNET_HELLO_Address *address;
187 * Number of bytes waiting for transmission to this peer.
189 unsigned long long bytes_in_queue;
192 * Number of messages waiting for transmission to this peer.
194 unsigned int msgs_in_queue;
197 * Reference counter to indicate that this session is
198 * currently being used and must not be destroyed;
199 * setting @e in_destroy will destroy it as soon as
205 * Is this session about to be destroyed (sometimes we cannot
206 * destroy a session immediately as below us on the stack
207 * there might be code that still uses it; in this case,
208 * @e rc is non-zero).
215 * Closure for #process_inbound_tokenized_messages().
217 struct SourceInformation
222 struct GNUNET_PeerIdentity sender;
225 * Associated session.
227 struct Session *session;
232 * Closure for #find_receive_context().
234 struct FindReceiveContext
237 * Where to store the result.
239 struct DefragContext *rc;
242 * Session associated with this context.
244 struct Session *session;
249 const union UdpAddress *udp_addr;
252 * Number of bytes in @e udp_addr.
259 * Data structure to track defragmentation contexts based
260 * on the source of the UDP traffic.
266 * Defragmentation context.
268 struct GNUNET_DEFRAGMENT_Context *defrag;
271 * Reference to master plugin struct.
273 struct Plugin *plugin;
276 * Node in the defrag heap.
278 struct GNUNET_CONTAINER_HeapNode *hnode;
281 * Who's message(s) are we defragmenting here?
282 * Only initialized once we succeeded and
283 * @e have_sender is set.
285 struct GNUNET_PeerIdentity sender;
288 * Source address this receive context is for (allocated at the
289 * end of the struct).
291 const union UdpAddress *udp_addr;
294 * Length of @e udp_addr.
299 * Network type the address belongs to.
301 enum GNUNET_ATS_Network_Type network_type;
304 * Has the @e sender field been initialized yet?
311 * Context to send fragmented messages
313 struct UDP_FragmentationContext
316 * Next in linked list
318 struct UDP_FragmentationContext *next;
321 * Previous in linked list
323 struct UDP_FragmentationContext *prev;
328 struct Plugin *plugin;
331 * Handle for GNUNET_FRAGMENT context
333 struct GNUNET_FRAGMENT_Context *frag;
336 * The session this fragmentation context belongs to
338 struct Session *session;
341 * Function to call upon completion of the transmission.
343 GNUNET_TRANSPORT_TransmitContinuation cont;
346 * Closure for @e cont.
353 struct GNUNET_TIME_Absolute timeout;
356 * Payload size of original unfragmented message
361 * Bytes used to send all fragments on wire including UDP overhead
368 unsigned int fragments_used;
374 * Message types included in a `struct UDP_MessageWrapper`
379 * Uninitialized (error)
384 * Fragment of a message.
386 UMT_MSG_FRAGMENTED = 1,
391 UMT_MSG_FRAGMENTED_COMPLETE = 2,
394 * Unfragmented message.
396 UMT_MSG_UNFRAGMENTED = 3,
399 * Receipt confirmation.
407 * Information we track for each message in the queue.
409 struct UDP_MessageWrapper
412 * Session this message belongs to
414 struct Session *session;
420 struct UDP_MessageWrapper *prev;
426 struct UDP_MessageWrapper *next;
429 * Message with size msg_size including UDP specific overhead
434 * Function to call upon completion of the transmission.
436 GNUNET_TRANSPORT_TransmitContinuation cont;
439 * Closure for @e cont.
444 * Fragmentation context
445 * frag_ctx == NULL if transport <= MTU
446 * frag_ctx != NULL if transport > MTU
448 struct UDP_FragmentationContext *frag_ctx;
453 struct GNUNET_TIME_Absolute timeout;
456 * Size of UDP message to send including UDP specific overhead
461 * Payload size of original message
468 enum UDP_MessageType msg_type;
474 * UDP ACK Message-Packet header.
476 struct UDP_ACK_Message
481 struct GNUNET_MessageHeader header;
484 * Desired delay for flow control
489 * What is the identity of the sender
491 struct GNUNET_PeerIdentity sender;
497 * If a session monitor is attached, notify it about the new
500 * @param plugin our plugin
501 * @param session session that changed state
502 * @param state new state of the session
505 notify_session_monitor (struct Plugin *plugin,
506 struct Session *session,
507 enum GNUNET_TRANSPORT_SessionState state)
509 struct GNUNET_TRANSPORT_SessionInfo info;
511 if (NULL == plugin->sic)
513 memset (&info, 0, sizeof (info));
515 info.is_inbound = GNUNET_SYSERR; /* hard to say */
516 info.num_msg_pending = session->msgs_in_queue;
517 info.num_bytes_pending = session->bytes_in_queue;
518 /* info.receive_delay remains zero as this is not supported by UDP
519 (cannot selectively not receive from 'some' peer while continuing
520 to receive from others) */
521 info.session_timeout = session->timeout;
522 info.address = session->address;
523 plugin->sic (plugin->sic_cls,
530 * We have been notified that our readset has something to read. We don't
531 * know which socket needs to be read, so we have to check each one
532 * Then reschedule this function to be called again once more is available.
534 * @param cls the plugin handle
535 * @param tc the scheduling context (for rescheduling this function again)
538 udp_plugin_select (void *cls,
539 const struct GNUNET_SCHEDULER_TaskContext *tc);
543 * We have been notified that our readset has something to read. We don't
544 * know which socket needs to be read, so we have to check each one
545 * Then reschedule this function to be called again once more is available.
547 * @param cls the plugin handle
548 * @param tc the scheduling context (for rescheduling this function again)
551 udp_plugin_select_v6 (void *cls,
552 const struct GNUNET_SCHEDULER_TaskContext *tc);
556 * (re)schedule select tasks for this plugin.
558 * @param plugin plugin to reschedule
561 schedule_select (struct Plugin *plugin)
563 struct GNUNET_TIME_Relative min_delay;
564 struct UDP_MessageWrapper *udpw;
566 if ((GNUNET_YES == plugin->enable_ipv4) && (NULL != plugin->sockv4))
568 /* Find a message ready to send:
569 * Flow delay from other peer is expired or not set (0) */
570 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
571 for (udpw = plugin->ipv4_queue_head; NULL != udpw; udpw = udpw->next)
572 min_delay = GNUNET_TIME_relative_min (min_delay,
573 GNUNET_TIME_absolute_get_remaining (
574 udpw->session->flow_delay_from_other_peer));
576 if (plugin->select_task != NULL )
577 GNUNET_SCHEDULER_cancel (plugin->select_task);
580 * - write active set if message is ready
581 * - timeout minimum delay */
582 plugin->select_task = GNUNET_SCHEDULER_add_select (
583 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
584 (0 == min_delay.rel_value_us) ?
585 GNUNET_TIME_UNIT_FOREVER_REL : min_delay, plugin->rs_v4,
586 (0 == min_delay.rel_value_us) ? plugin->ws_v4 : NULL,
587 &udp_plugin_select, plugin);
589 if ((GNUNET_YES == plugin->enable_ipv6) && (NULL != plugin->sockv6))
591 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
592 for (udpw = plugin->ipv6_queue_head; NULL != udpw; udpw = udpw->next)
593 min_delay = GNUNET_TIME_relative_min (min_delay,
594 GNUNET_TIME_absolute_get_remaining (
595 udpw->session->flow_delay_from_other_peer));
597 if (NULL != plugin->select_task_v6)
598 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
599 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (
600 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
601 (0 == min_delay.rel_value_us) ?
602 GNUNET_TIME_UNIT_FOREVER_REL : min_delay, plugin->rs_v6,
603 (0 == min_delay.rel_value_us) ? plugin->ws_v6 : NULL,
604 &udp_plugin_select_v6, plugin);
610 * Function called for a quick conversion of the binary address to
611 * a numeric address. Note that the caller must not free the
612 * address and that the next call to this function is allowed
613 * to override the address again.
616 * @param addr binary address (a `union UdpAddress`)
617 * @param addrlen length of the @a addr
618 * @return string representing the same address
621 udp_address_to_string (void *cls,
625 static char rbuf[INET6_ADDRSTRLEN + 10];
626 char buf[INET6_ADDRSTRLEN];
630 const struct IPv4UdpAddress *t4;
631 const struct IPv6UdpAddress *t6;
636 if ((NULL != addr) && (addrlen == sizeof(struct IPv6UdpAddress)))
640 options = ntohl (t6->options);
641 port = ntohs (t6->u6_port);
642 memcpy (&a6, &t6->ipv6_addr, sizeof(a6));
645 else if ((NULL != addr) && (addrlen == sizeof(struct IPv4UdpAddress)))
649 options = ntohl (t4->options);
650 port = ntohs (t4->u4_port);
651 memcpy (&a4, &t4->ipv4_addr, sizeof(a4));
658 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
660 GNUNET_snprintf (rbuf, sizeof(rbuf),
673 * Function called to convert a string address to
676 * @param cls closure (`struct Plugin *`)
677 * @param addr string address
678 * @param addrlen length of the address
679 * @param buf location to store the buffer
680 * @param added location to store the number of bytes in the buffer.
681 * If the function returns #GNUNET_SYSERR, its contents are undefined.
682 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
685 udp_string_to_address (void *cls,
691 struct sockaddr_storage socket_address;
697 /* Format tcp.options.address:port */
702 if ((NULL == addr) || (addrlen == 0))
705 return GNUNET_SYSERR;
707 if ('\0' != addr[addrlen - 1])
710 return GNUNET_SYSERR;
712 if (strlen (addr) != addrlen - 1)
715 return GNUNET_SYSERR;
717 plugin = GNUNET_strdup (addr);
718 optionstr = strchr (plugin, '.');
719 if (NULL == optionstr)
723 return GNUNET_SYSERR;
727 options = atol (optionstr);
728 address = strchr (optionstr, '.');
733 return GNUNET_SYSERR;
739 GNUNET_STRINGS_to_address_ip (address, strlen (address),
744 return GNUNET_SYSERR;
749 switch (socket_address.ss_family)
753 struct IPv4UdpAddress *u4;
754 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
755 u4 = GNUNET_new (struct IPv4UdpAddress);
756 u4->options = htonl (options);
757 u4->ipv4_addr = in4->sin_addr.s_addr;
758 u4->u4_port = in4->sin_port;
760 *added = sizeof(struct IPv4UdpAddress);
765 struct IPv6UdpAddress *u6;
766 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
767 u6 = GNUNET_new (struct IPv6UdpAddress);
768 u6->options = htonl (options);
769 u6->ipv6_addr = in6->sin6_addr;
770 u6->u6_port = in6->sin6_port;
772 *added = sizeof(struct IPv6UdpAddress);
777 return GNUNET_SYSERR;
783 * Append our port and forward the result.
785 * @param cls a `struct PrettyPrinterContext *`
786 * @param hostname result from DNS resolver
789 append_port (void *cls,
790 const char *hostname)
792 struct PrettyPrinterContext *ppc = cls;
793 struct Plugin *plugin = ppc->plugin;
796 if (NULL == hostname)
798 /* Final call, done */
799 ppc->asc (ppc->asc_cls,
802 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
803 plugin->ppc_dll_tail,
805 ppc->resolver_handle = NULL;
809 if (GNUNET_YES == ppc->ipv6)
810 GNUNET_asprintf (&ret,
817 GNUNET_asprintf (&ret,
823 ppc->asc (ppc->asc_cls,
831 * Convert the transports address to a nice, human-readable
834 * @param cls closure with the `struct Plugin *`
835 * @param type name of the transport that generated the address
836 * @param addr one of the addresses of the host, NULL for the last address
837 * the specific address format depends on the transport;
838 * a `union UdpAddress`
839 * @param addrlen length of the address
840 * @param numeric should (IP) addresses be displayed in numeric form?
841 * @param timeout after how long should we give up?
842 * @param asc function to call on each string
843 * @param asc_cls closure for @a asc
846 udp_plugin_address_pretty_printer (void *cls,
851 struct GNUNET_TIME_Relative timeout,
852 GNUNET_TRANSPORT_AddressStringCallback asc,
855 struct Plugin *plugin = cls;
856 struct PrettyPrinterContext *ppc;
859 struct sockaddr_in a4;
860 struct sockaddr_in6 a6;
861 const struct IPv4UdpAddress *u4;
862 const struct IPv6UdpAddress *u6;
866 if (addrlen == sizeof(struct IPv6UdpAddress))
869 memset (&a6, 0, sizeof(a6));
870 a6.sin6_family = AF_INET6;
871 #if HAVE_SOCKADDR_IN_SIN_LEN
872 a6.sin6_len = sizeof (a6);
874 a6.sin6_port = u6->u6_port;
875 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
876 port = ntohs (u6->u6_port);
877 options = ntohl (u6->options);
881 else if (addrlen == sizeof(struct IPv4UdpAddress))
884 memset (&a4, 0, sizeof(a4));
885 a4.sin_family = AF_INET;
886 #if HAVE_SOCKADDR_IN_SIN_LEN
887 a4.sin_len = sizeof (a4);
889 a4.sin_port = u4->u4_port;
890 a4.sin_addr.s_addr = u4->ipv4_addr;
891 port = ntohs (u4->u4_port);
892 options = ntohl (u4->options);
898 /* invalid address */
900 asc (asc_cls, NULL , GNUNET_SYSERR);
901 asc (asc_cls, NULL, GNUNET_OK);
904 ppc = GNUNET_new (struct PrettyPrinterContext);
905 ppc->plugin = plugin;
907 ppc->asc_cls = asc_cls;
909 ppc->options = options;
910 if (addrlen == sizeof(struct IPv6UdpAddress))
911 ppc->ipv6 = GNUNET_YES;
913 ppc->ipv6 = GNUNET_NO;
914 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
915 plugin->ppc_dll_tail,
918 = GNUNET_RESOLVER_hostname_get (sb,
930 call_continuation (struct UDP_MessageWrapper *udpw,
933 struct Session *session = udpw->session;
934 struct Plugin *plugin = session->plugin;
937 LOG (GNUNET_ERROR_TYPE_DEBUG,
938 "Calling continuation for %u byte message to `%s' with result %s\n",
939 udpw->payload_size, GNUNET_i2s (&udpw->session->target),
940 (GNUNET_OK == result) ? "OK" : "SYSERR");
942 if (udpw->msg_size >= udpw->payload_size)
943 overhead = udpw->msg_size - udpw->payload_size;
945 overhead = udpw->msg_size;
950 switch (udpw->msg_type)
952 case UMT_MSG_UNFRAGMENTED:
953 if (NULL != udpw->cont)
955 /* Transport continuation */
956 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
957 udpw->payload_size, udpw->msg_size);
959 GNUNET_STATISTICS_update (plugin->env->stats,
960 "# UDP, unfragmented msgs, messages, sent, success", 1, GNUNET_NO);
961 GNUNET_STATISTICS_update (plugin->env->stats,
962 "# UDP, unfragmented msgs, bytes payload, sent, success",
963 udpw->payload_size, GNUNET_NO);
964 GNUNET_STATISTICS_update (plugin->env->stats,
965 "# UDP, unfragmented msgs, bytes overhead, sent, success", overhead,
967 GNUNET_STATISTICS_update (plugin->env->stats,
968 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
969 GNUNET_STATISTICS_update (plugin->env->stats,
970 "# UDP, total, bytes payload, sent", udpw->payload_size, GNUNET_NO);
972 case UMT_MSG_FRAGMENTED_COMPLETE:
973 GNUNET_assert(NULL != udpw->frag_ctx);
974 if (udpw->frag_ctx->cont != NULL )
975 udpw->frag_ctx->cont (udpw->frag_ctx->cont_cls, &udpw->session->target,
976 GNUNET_OK, udpw->frag_ctx->payload_size,
977 udpw->frag_ctx->on_wire_size);
978 GNUNET_STATISTICS_update (plugin->env->stats,
979 "# UDP, fragmented msgs, messages, sent, success", 1, GNUNET_NO);
980 GNUNET_STATISTICS_update (plugin->env->stats,
981 "# UDP, fragmented msgs, bytes payload, sent, success",
982 udpw->payload_size, GNUNET_NO);
983 GNUNET_STATISTICS_update (plugin->env->stats,
984 "# UDP, fragmented msgs, bytes overhead, sent, success", overhead,
986 GNUNET_STATISTICS_update (plugin->env->stats,
987 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
988 GNUNET_STATISTICS_update (plugin->env->stats,
989 "# UDP, total, bytes payload, sent", udpw->payload_size, GNUNET_NO);
990 GNUNET_STATISTICS_update (plugin->env->stats,
991 "# UDP, fragmented msgs, messages, pending", -1, GNUNET_NO);
993 case UMT_MSG_FRAGMENTED:
994 /* Fragmented message: enqueue next fragment */
995 if (NULL != udpw->cont)
996 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
997 udpw->payload_size, udpw->msg_size);
998 GNUNET_STATISTICS_update (plugin->env->stats,
999 "# UDP, fragmented msgs, fragments, sent, success", 1, GNUNET_NO);
1000 GNUNET_STATISTICS_update (plugin->env->stats,
1001 "# UDP, fragmented msgs, fragments bytes, sent, success",
1002 udpw->msg_size, GNUNET_NO);
1005 /* No continuation */
1006 GNUNET_STATISTICS_update (plugin->env->stats,
1007 "# UDP, ACK msgs, messages, sent, success", 1, GNUNET_NO);
1008 GNUNET_STATISTICS_update (plugin->env->stats,
1009 "# UDP, ACK msgs, bytes overhead, sent, success", overhead,
1011 GNUNET_STATISTICS_update (plugin->env->stats,
1012 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
1020 switch (udpw->msg_type)
1022 case UMT_MSG_UNFRAGMENTED:
1023 /* Unfragmented message: failed to send */
1024 if (NULL != udpw->cont)
1025 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
1026 udpw->payload_size, overhead);
1027 GNUNET_STATISTICS_update (plugin->env->stats,
1028 "# UDP, unfragmented msgs, messages, sent, failure", 1, GNUNET_NO);
1029 GNUNET_STATISTICS_update (plugin->env->stats,
1030 "# UDP, unfragmented msgs, bytes payload, sent, failure",
1031 udpw->payload_size, GNUNET_NO);
1032 GNUNET_STATISTICS_update (plugin->env->stats,
1033 "# UDP, unfragmented msgs, bytes overhead, sent, failure", overhead,
1036 case UMT_MSG_FRAGMENTED_COMPLETE:
1037 GNUNET_assert(NULL != udpw->frag_ctx);
1038 if (udpw->frag_ctx->cont != NULL )
1039 udpw->frag_ctx->cont (udpw->frag_ctx->cont_cls, &udpw->session->target,
1040 GNUNET_SYSERR, udpw->frag_ctx->payload_size,
1041 udpw->frag_ctx->on_wire_size);
1042 GNUNET_STATISTICS_update (plugin->env->stats,
1043 "# UDP, fragmented msgs, messages, sent, failure", 1, GNUNET_NO);
1044 GNUNET_STATISTICS_update (plugin->env->stats,
1045 "# UDP, fragmented msgs, bytes payload, sent, failure",
1046 udpw->payload_size, GNUNET_NO);
1047 GNUNET_STATISTICS_update (plugin->env->stats,
1048 "# UDP, fragmented msgs, bytes payload, sent, failure", overhead,
1050 GNUNET_STATISTICS_update (plugin->env->stats,
1051 "# UDP, fragmented msgs, bytes payload, sent, failure", overhead,
1053 GNUNET_STATISTICS_update (plugin->env->stats,
1054 "# UDP, fragmented msgs, messages, pending", -1, GNUNET_NO);
1056 case UMT_MSG_FRAGMENTED:
1057 GNUNET_assert(NULL != udpw->frag_ctx);
1058 /* Fragmented message: failed to send */
1059 GNUNET_STATISTICS_update (plugin->env->stats,
1060 "# UDP, fragmented msgs, fragments, sent, failure", 1, GNUNET_NO);
1061 GNUNET_STATISTICS_update (plugin->env->stats,
1062 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1063 udpw->msg_size, GNUNET_NO);
1066 /* ACK message: failed to send */
1067 GNUNET_STATISTICS_update (plugin->env->stats,
1068 "# UDP, ACK msgs, messages, sent, failure", 1, GNUNET_NO);
1083 * Check if the given port is plausible (must be either our listen
1084 * port or our advertised port). If it is neither, we return
1087 * @param plugin global variables
1088 * @param in_port port number to check
1089 * @return #GNUNET_OK if port is either open_port or adv_port
1092 check_port (struct Plugin *plugin,
1095 if ((in_port == plugin->port) || (in_port == plugin->aport))
1097 return GNUNET_SYSERR;
1102 * Function that will be called to check if a binary address for this
1103 * plugin is well-formed and corresponds to an address for THIS peer
1104 * (as per our configuration). Naturally, if absolutely necessary,
1105 * plugins can be a bit conservative in their answer, but in general
1106 * plugins should make sure that the address does not redirect
1107 * traffic to a 3rd party that might try to man-in-the-middle our
1110 * @param cls closure, should be our handle to the Plugin
1111 * @param addr pointer to a `union UdpAddress`
1112 * @param addrlen length of @a addr
1113 * @return #GNUNET_OK if this is a plausible address for this peer
1114 * and transport, #GNUNET_SYSERR if not
1117 udp_plugin_check_address (void *cls,
1121 struct Plugin *plugin = cls;
1122 struct IPv4UdpAddress *v4;
1123 struct IPv6UdpAddress *v6;
1125 if ( (addrlen != sizeof(struct IPv4UdpAddress)) &&
1126 (addrlen != sizeof(struct IPv6UdpAddress)) )
1129 return GNUNET_SYSERR;
1131 if (addrlen == sizeof(struct IPv4UdpAddress))
1133 v4 = (struct IPv4UdpAddress *) addr;
1134 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1135 return GNUNET_SYSERR;
1137 GNUNET_NAT_test_address (plugin->nat,
1139 sizeof (struct in_addr)))
1140 return GNUNET_SYSERR;
1144 v6 = (struct IPv6UdpAddress *) addr;
1145 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1148 return GNUNET_SYSERR;
1150 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1151 return GNUNET_SYSERR;
1153 GNUNET_NAT_test_address (plugin->nat,
1155 sizeof(struct in6_addr)))
1156 return GNUNET_SYSERR;
1163 * Function to free last resources associated with a session.
1165 * @param s session to free
1168 free_session (struct Session *s)
1170 if (NULL != s->frag_ctx)
1172 GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag, NULL, NULL );
1173 GNUNET_free(s->frag_ctx);
1181 * Remove a message from the transmission queue.
1183 * @param plugin the UDP plugin
1184 * @param udpw message wrapper to queue
1187 dequeue (struct Plugin *plugin,
1188 struct UDP_MessageWrapper *udpw)
1190 struct Session *session = udpw->session;
1192 if (plugin->bytes_in_buffer < udpw->msg_size)
1198 GNUNET_STATISTICS_update (plugin->env->stats,
1199 "# UDP, total, bytes in buffers",
1200 -(long long) udpw->msg_size,
1202 plugin->bytes_in_buffer -= udpw->msg_size;
1204 GNUNET_STATISTICS_update (plugin->env->stats,
1205 "# UDP, total, msgs in buffers",
1207 if (udpw->session->address->address_length == sizeof(struct IPv4UdpAddress))
1208 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1209 plugin->ipv4_queue_tail,
1211 else if (udpw->session->address->address_length == sizeof(struct IPv6UdpAddress))
1212 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1213 plugin->ipv6_queue_tail,
1220 GNUNET_assert (session->msgs_in_queue > 0);
1221 session->msgs_in_queue--;
1222 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1223 session->bytes_in_queue -= udpw->msg_size;
1231 fragmented_message_done (struct UDP_FragmentationContext *fc,
1234 struct Plugin *plugin = fc->plugin;
1235 struct Session *s = fc->session;
1236 struct UDP_MessageWrapper *udpw;
1237 struct UDP_MessageWrapper *tmp;
1238 struct UDP_MessageWrapper dummy;
1240 LOG (GNUNET_ERROR_TYPE_DEBUG,
1241 "%p : Fragmented message removed with result %s\n",
1243 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1245 /* Call continuation for fragmented message */
1246 memset (&dummy, 0, sizeof(dummy));
1247 dummy.msg_type = UMT_MSG_FRAGMENTED_COMPLETE;
1248 dummy.msg_size = s->frag_ctx->on_wire_size;
1249 dummy.payload_size = s->frag_ctx->payload_size;
1250 dummy.frag_ctx = s->frag_ctx;
1252 dummy.cont_cls = NULL;
1254 call_continuation (&dummy, result);
1255 /* Remove leftover fragments from queue */
1256 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1258 udpw = plugin->ipv6_queue_head;
1259 while (NULL != udpw)
1262 if ((udpw->frag_ctx != NULL )&& (udpw->frag_ctx == s->frag_ctx)){
1263 dequeue (plugin, udpw);
1264 call_continuation (udpw, GNUNET_SYSERR);
1270 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1272 udpw = plugin->ipv4_queue_head;
1273 while (udpw != NULL )
1276 if ((NULL != udpw->frag_ctx) && (udpw->frag_ctx == s->frag_ctx))
1278 dequeue (plugin, udpw);
1279 call_continuation (udpw, GNUNET_SYSERR);
1285 notify_session_monitor (s->plugin,
1287 GNUNET_TRANSPORT_SS_UPDATE);
1288 /* Destroy fragmentation context */
1289 GNUNET_FRAGMENT_context_destroy (fc->frag,
1290 &s->last_expected_msg_delay,
1291 &s->last_expected_ack_delay);
1298 * Scan the heap for a receive context with the given address.
1300 * @param cls the `struct FindReceiveContext`
1301 * @param node internal node of the heap
1302 * @param element value stored at the node (a `struct ReceiveContext`)
1303 * @param cost cost associated with the node
1304 * @return #GNUNET_YES if we should continue to iterate,
1305 * #GNUNET_NO if not.
1308 find_receive_context (void *cls,
1309 struct GNUNET_CONTAINER_HeapNode *node,
1311 GNUNET_CONTAINER_HeapCostType cost)
1313 struct FindReceiveContext *frc = cls;
1314 struct DefragContext *e = element;
1316 if ( (frc->udp_addr_len == e->udp_addr_len) &&
1317 (0 == memcmp (frc->udp_addr,
1319 frc->udp_addr_len)) )
1329 * Functions with this signature are called whenever we need
1330 * to close a session due to a disconnect or failure to
1331 * establish a connection.
1333 * @param cls closure with the `struct Plugin`
1334 * @param s session to close down
1335 * @return #GNUNET_OK on success
1338 udp_disconnect_session (void *cls,
1341 struct Plugin *plugin = cls;
1342 struct UDP_MessageWrapper *udpw;
1343 struct UDP_MessageWrapper *next;
1344 struct FindReceiveContext frc;
1346 GNUNET_assert (GNUNET_YES != s->in_destroy);
1347 LOG (GNUNET_ERROR_TYPE_DEBUG,
1348 "Session %p to peer `%s' address ended\n", s,
1349 GNUNET_i2s (&s->target),
1350 udp_address_to_string (plugin,
1351 s->address->address,
1352 s->address->address_length));
1353 /* stop timeout task */
1354 if (NULL != s->timeout_task)
1356 GNUNET_SCHEDULER_cancel (s->timeout_task);
1357 s->timeout_task = NULL;
1359 if (NULL != s->frag_ctx)
1361 /* Remove fragmented message due to disconnect */
1362 fragmented_message_done (s->frag_ctx,
1367 frc.udp_addr = s->address->address;
1368 frc.udp_addr_len = s->address->address_length;
1369 /* Lookup existing receive context for this address */
1370 if (NULL != plugin->defrag_ctxs)
1372 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1373 &find_receive_context,
1377 struct DefragContext *d_ctx = frc.rc;
1379 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
1380 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1381 GNUNET_free (d_ctx);
1384 next = plugin->ipv4_queue_head;
1385 while (NULL != (udpw = next))
1388 if (udpw->session == s)
1390 dequeue (plugin, udpw);
1391 call_continuation (udpw, GNUNET_SYSERR);
1395 next = plugin->ipv6_queue_head;
1396 while (NULL != (udpw = next))
1399 if (udpw->session == s)
1401 dequeue (plugin, udpw);
1402 call_continuation (udpw, GNUNET_SYSERR);
1406 notify_session_monitor (s->plugin,
1408 GNUNET_TRANSPORT_SS_DONE);
1409 plugin->env->session_end (plugin->env->cls,
1413 if (NULL != s->frag_ctx)
1415 if (NULL != s->frag_ctx->cont)
1417 s->frag_ctx->cont (s->frag_ctx->cont_cls,
1420 s->frag_ctx->payload_size,
1421 s->frag_ctx->on_wire_size);
1422 LOG (GNUNET_ERROR_TYPE_DEBUG,
1423 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
1424 GNUNET_i2s (&s->target));
1428 GNUNET_assert (GNUNET_YES ==
1429 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
1432 GNUNET_STATISTICS_set (plugin->env->stats,
1433 "# UDP sessions active",
1434 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
1438 s->in_destroy = GNUNET_YES;
1442 GNUNET_HELLO_address_free (s->address);
1450 * Function that is called to get the keepalive factor.
1451 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
1452 * calculate the interval between keepalive packets.
1454 * @param cls closure with the `struct Plugin`
1455 * @return keepalive factor
1458 udp_query_keepalive_factor (void *cls)
1465 * Destroy a session, plugin is being unloaded.
1467 * @param cls the `struct Plugin`
1468 * @param key hash of public key of target peer
1469 * @param value a `struct PeerSession *` to clean up
1470 * @return #GNUNET_OK (continue to iterate)
1473 disconnect_and_free_it (void *cls,
1474 const struct GNUNET_PeerIdentity *key,
1477 struct Plugin *plugin = cls;
1479 udp_disconnect_session (plugin, value);
1485 * Disconnect from a remote node. Clean up session if we have one for
1488 * @param cls closure for this call (should be handle to Plugin)
1489 * @param target the peeridentity of the peer to disconnect
1490 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
1493 udp_disconnect (void *cls,
1494 const struct GNUNET_PeerIdentity *target)
1496 struct Plugin *plugin = cls;
1498 LOG (GNUNET_ERROR_TYPE_DEBUG,
1499 "Disconnecting from peer `%s'\n",
1500 GNUNET_i2s (target));
1501 /* Clean up sessions */
1502 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1504 &disconnect_and_free_it,
1510 * Session was idle, so disconnect it
1512 * @param cls the `struct Session` to time out
1513 * @param tc scheduler context
1516 session_timeout (void *cls,
1517 const struct GNUNET_SCHEDULER_TaskContext *tc)
1519 struct Session *s = cls;
1520 struct Plugin *plugin = s->plugin;
1521 struct GNUNET_TIME_Relative left;
1523 s->timeout_task = NULL;
1524 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
1525 if (left.rel_value_us > 0)
1527 /* not actually our turn yet, but let's at least update
1528 the monitor, it may think we're about to die ... */
1529 notify_session_monitor (s->plugin,
1531 GNUNET_TRANSPORT_SS_UPDATE);
1532 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
1537 LOG (GNUNET_ERROR_TYPE_DEBUG,
1538 "Session %p was idle for %s, disconnecting\n",
1540 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
1542 /* call session destroy function */
1543 udp_disconnect_session (plugin, s);
1548 * Increment session timeout due to activity
1550 * @param s session to reschedule timeout activity for
1553 reschedule_session_timeout (struct Session *s)
1555 if (GNUNET_YES == s->in_destroy)
1557 GNUNET_assert(NULL != s->timeout_task);
1558 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1565 static struct Session *
1566 create_session (struct Plugin *plugin,
1567 const struct GNUNET_HELLO_Address *address)
1571 s = GNUNET_new (struct Session);
1573 s->address = GNUNET_HELLO_address_copy (address);
1574 s->target = address->peer;
1575 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1577 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1578 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO_ABS;
1579 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
1580 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1581 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
1582 &session_timeout, s);
1588 * Function obtain the network type for a session
1590 * @param cls closure ('struct Plugin*')
1591 * @param session the session
1592 * @return the network type
1594 static enum GNUNET_ATS_Network_Type
1595 udp_get_network (void *cls,
1596 struct Session *session)
1598 return ntohl (session->ats.value);
1603 * Closure for #session_cmp_it().
1605 struct SessionCompareContext
1608 * Set to session matching the address.
1610 struct Session *res;
1613 * Address we are looking for.
1615 const struct GNUNET_HELLO_Address *address;
1620 * Find a session with a matching address.
1622 * @param cls the `struct SessionCompareContext *`
1623 * @param key peer identity (unused)
1624 * @param value the `struct Session *`
1625 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1628 session_cmp_it (void *cls,
1629 const struct GNUNET_PeerIdentity *key,
1632 struct SessionCompareContext *cctx = cls;
1633 const struct GNUNET_HELLO_Address *address = cctx->address;
1634 struct Session *s = value;
1636 LOG (GNUNET_ERROR_TYPE_DEBUG,
1637 "Comparing address %s <-> %s\n",
1638 udp_address_to_string (s->plugin,
1640 address->address_length),
1641 udp_address_to_string (s->plugin,
1642 s->address->address,
1643 s->address->address_length));
1644 if (0 == GNUNET_HELLO_address_cmp(s->address, cctx->address))
1654 * Locate an existing session the transport service is using to
1655 * send data to another peer. Performs some basic sanity checks
1656 * on the address and then tries to locate a matching session.
1658 * @param cls the plugin
1659 * @param address the address we should locate the session by
1660 * @return the session if it exists, or NULL if it is not found
1662 static struct Session *
1663 udp_plugin_lookup_session (void *cls,
1664 const struct GNUNET_HELLO_Address *address)
1666 struct Plugin *plugin = cls;
1667 const struct IPv6UdpAddress *udp_a6;
1668 const struct IPv4UdpAddress *udp_a4;
1669 struct SessionCompareContext cctx;
1671 if ( (NULL == address->address) ||
1672 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
1673 (address->address_length != sizeof (struct IPv6UdpAddress))))
1675 LOG (GNUNET_ERROR_TYPE_WARNING,
1676 _("Trying to locate session for address of unexpected length %u (should be %u or %u)\n"),
1677 address->address_length,
1678 sizeof (struct IPv4UdpAddress),
1679 sizeof (struct IPv6UdpAddress));
1683 if (address->address_length == sizeof(struct IPv4UdpAddress))
1685 if (NULL == plugin->sockv4)
1687 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1688 if (0 == udp_a4->u4_port)
1692 if (address->address_length == sizeof(struct IPv6UdpAddress))
1694 if (NULL == plugin->sockv6)
1696 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1697 if (0 == udp_a6->u6_port)
1701 /* check if session already exists */
1702 cctx.address = address;
1704 LOG (GNUNET_ERROR_TYPE_DEBUG,
1705 "Looking for existing session for peer `%s' `%s' \n",
1706 GNUNET_i2s (&address->peer),
1707 udp_address_to_string (plugin,
1709 address->address_length));
1710 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1714 if (NULL != cctx.res)
1716 LOG (GNUNET_ERROR_TYPE_DEBUG,
1717 "Found existing session %p\n",
1726 * Allocate a new session for the given endpoint address.
1727 * Note that this function does not inform the service
1728 * of the new session, this is the responsibility of the
1729 * caller (if needed).
1731 * @param cls the `struct Plugin`
1732 * @param address address of the other peer to use
1733 * @param network_type network type the address belongs to
1734 * @return NULL on error, otherwise session handle
1736 static struct Session *
1737 udp_plugin_create_session (void *cls,
1738 const struct GNUNET_HELLO_Address *address,
1739 enum GNUNET_ATS_Network_Type network_type)
1741 struct Plugin *plugin = cls;
1744 s = create_session (plugin, address);
1745 s->ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1746 s->ats.value = htonl (network_type);
1749 return NULL; /* protocol not supported or address invalid */
1750 LOG (GNUNET_ERROR_TYPE_DEBUG,
1751 "Creating new session %p for peer `%s' address `%s'\n",
1753 GNUNET_i2s (&address->peer),
1754 udp_address_to_string (plugin,
1756 address->address_length));
1757 GNUNET_assert(GNUNET_OK ==
1758 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
1761 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1762 GNUNET_STATISTICS_set (plugin->env->stats,
1763 "# UDP sessions active",
1764 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
1771 * Function that will be called whenever the transport service wants to
1772 * notify the plugin that a session is still active and in use and
1773 * therefore the session timeout for this session has to be updated
1775 * @param cls closure
1776 * @param peer which peer was the session for
1777 * @param session which session is being updated
1780 udp_plugin_update_session_timeout (void *cls,
1781 const struct GNUNET_PeerIdentity *peer,
1782 struct Session *session)
1784 struct Plugin *plugin = cls;
1787 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1794 /* Reschedule session timeout */
1795 reschedule_session_timeout (session);
1800 * Creates a new outbound session the transport service will use to
1801 * send data to the peer.
1803 * @param cls the plugin
1804 * @param address the address
1805 * @return the session or NULL of max connections exceeded
1807 static struct Session *
1808 udp_plugin_get_session (void *cls,
1809 const struct GNUNET_HELLO_Address *address)
1811 struct Plugin *plugin = cls;
1813 enum GNUNET_ATS_Network_Type network_type;
1814 struct IPv4UdpAddress *udp_v4;
1815 struct IPv6UdpAddress *udp_v6;
1817 if (NULL == address)
1822 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
1823 (address->address_length != sizeof(struct IPv6UdpAddress)) )
1825 if (NULL != (s = udp_plugin_lookup_session (cls,
1829 if (sizeof (struct IPv4UdpAddress) == address->address_length)
1831 struct sockaddr_in v4;
1833 udp_v4 = (struct IPv4UdpAddress *) address->address;
1834 memset (&v4, '\0', sizeof (v4));
1835 v4.sin_family = AF_INET;
1836 #if HAVE_SOCKADDR_IN_SIN_LEN
1837 v4.sin_len = sizeof (struct sockaddr_in);
1839 v4.sin_port = udp_v4->u4_port;
1840 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
1841 network_type = plugin->env->get_address_type (plugin->env->cls,
1842 (const struct sockaddr *) &v4,
1845 else if (sizeof (struct IPv6UdpAddress) == address->address_length)
1847 struct sockaddr_in6 v6;
1849 udp_v6 = (struct IPv6UdpAddress *) address->address;
1850 memset (&v6, '\0', sizeof (v6));
1851 v6.sin6_family = AF_INET6;
1852 #if HAVE_SOCKADDR_IN_SIN_LEN
1853 v6.sin6_len = sizeof (struct sockaddr_in6);
1855 v6.sin6_port = udp_v6->u6_port;
1856 v6.sin6_addr = udp_v6->ipv6_addr;
1857 network_type = plugin->env->get_address_type (plugin->env->cls,
1858 (const struct sockaddr *) &v6,
1862 /* otherwise create new */
1863 return udp_plugin_create_session (cls, address, network_type);
1868 * Enqueue a message for transmission.
1870 * @param plugin the UDP plugin
1871 * @param udpw message wrapper to queue
1874 enqueue (struct Plugin *plugin,
1875 struct UDP_MessageWrapper *udpw)
1877 struct Session *session = udpw->session;
1879 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1885 GNUNET_STATISTICS_update (plugin->env->stats,
1886 "# UDP, total, bytes in buffers", udpw->msg_size, GNUNET_NO);
1887 plugin->bytes_in_buffer += udpw->msg_size;
1889 GNUNET_STATISTICS_update (plugin->env->stats,
1890 "# UDP, total, msgs in buffers",
1892 if (udpw->session->address->address_length == sizeof (struct IPv4UdpAddress))
1893 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1894 plugin->ipv4_queue_tail,
1896 else if (udpw->session->address->address_length == sizeof (struct IPv6UdpAddress))
1897 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1898 plugin->ipv6_queue_tail,
1905 session->msgs_in_queue++;
1906 session->bytes_in_queue += udpw->msg_size;
1911 * Fragment message was transmitted via UDP, let fragmentation know
1912 * to send the next fragment now.
1914 * @param cls the `struct UDPMessageWrapper *` of the fragment
1915 * @param target destination peer (ignored)
1916 * @param result #GNUNET_OK on success (ignored)
1917 * @param payload bytes payload sent
1918 * @param physical bytes physical sent
1921 send_next_fragment (void *cls,
1922 const struct GNUNET_PeerIdentity *target,
1927 struct UDP_MessageWrapper *udpw = cls;
1929 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1934 * Function that is called with messages created by the fragmentation
1935 * module. In the case of the 'proc' callback of the
1936 * #GNUNET_FRAGMENT_context_create() function, this function must
1937 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1939 * @param cls closure, the 'struct FragmentationContext'
1940 * @param msg the message that was created
1943 enqueue_fragment (void *cls,
1944 const struct GNUNET_MessageHeader *msg)
1946 struct UDP_FragmentationContext *frag_ctx = cls;
1947 struct Plugin *plugin = frag_ctx->plugin;
1948 struct UDP_MessageWrapper * udpw;
1949 size_t msg_len = ntohs (msg->size);
1951 LOG (GNUNET_ERROR_TYPE_DEBUG,
1952 "Enqueuing fragment with %u bytes\n",
1954 frag_ctx->fragments_used++;
1955 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1956 udpw->session = frag_ctx->session;
1957 udpw->msg_buf = (char *) &udpw[1];
1958 udpw->msg_size = msg_len;
1959 udpw->payload_size = msg_len; /*FIXME: minus fragment overhead */
1960 udpw->cont = &send_next_fragment;
1961 udpw->cont_cls = udpw;
1962 udpw->timeout = frag_ctx->timeout;
1963 udpw->frag_ctx = frag_ctx;
1964 udpw->msg_type = UMT_MSG_FRAGMENTED;
1965 memcpy (udpw->msg_buf, msg, msg_len);
1966 enqueue (plugin, udpw);
1967 schedule_select (plugin);
1972 * Function that can be used by the transport service to transmit
1973 * a message using the plugin. Note that in the case of a
1974 * peer disconnecting, the continuation MUST be called
1975 * prior to the disconnect notification itself. This function
1976 * will be called with this peer's HELLO message to initiate
1977 * a fresh connection to another peer.
1979 * @param cls closure
1980 * @param s which session must be used
1981 * @param msgbuf the message to transmit
1982 * @param msgbuf_size number of bytes in 'msgbuf'
1983 * @param priority how important is the message (most plugins will
1984 * ignore message priority and just FIFO)
1985 * @param to how long to wait at most for the transmission (does not
1986 * require plugins to discard the message after the timeout,
1987 * just advisory for the desired delay; most plugins will ignore
1989 * @param cont continuation to call once the message has
1990 * been transmitted (or if the transport is ready
1991 * for the next transmission call; or if the
1992 * peer disconnected...); can be NULL
1993 * @param cont_cls closure for cont
1994 * @return number of bytes used (on the physical network, with overheads);
1995 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1996 * and does NOT mean that the message was not transmitted (DV)
1999 udp_plugin_send (void *cls,
2003 unsigned int priority,
2004 struct GNUNET_TIME_Relative to,
2005 GNUNET_TRANSPORT_TransmitContinuation cont,
2008 struct Plugin *plugin = cls;
2009 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2010 struct UDP_FragmentationContext * frag_ctx;
2011 struct UDP_MessageWrapper * udpw;
2012 struct UDPMessage *udp;
2014 GNUNET_assert(plugin != NULL);
2015 GNUNET_assert(s != NULL);
2017 if ( (s->address->address_length == sizeof(struct IPv6UdpAddress)) &&
2018 (plugin->sockv6 == NULL) )
2019 return GNUNET_SYSERR;
2020 if ( (s->address->address_length == sizeof(struct IPv4UdpAddress)) &&
2021 (plugin->sockv4 == NULL) )
2022 return GNUNET_SYSERR;
2023 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2026 return GNUNET_SYSERR;
2029 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2034 return GNUNET_SYSERR;
2036 LOG (GNUNET_ERROR_TYPE_DEBUG,
2037 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2039 GNUNET_i2s (&s->target),
2040 udp_address_to_string (plugin,
2041 s->address->address,
2042 s->address->address_length));
2045 udp = (struct UDPMessage *) mbuf;
2046 udp->header.size = htons (udpmlen);
2047 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2048 udp->reserved = htonl (0);
2049 udp->sender = *plugin->env->my_identity;
2051 /* We do not update the session time out here!
2052 * Otherwise this session will not timeout since we send keep alive before
2053 * session can timeout
2055 * For UDP we update session timeout only on receive, this will cover keep
2056 * alives, since remote peer will reply with keep alive response!
2058 if (udpmlen <= UDP_MTU)
2060 /* unfragmented message */
2061 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2063 udpw->msg_buf = (char *) &udpw[1];
2064 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2065 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2066 udpw->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), to);
2068 udpw->cont_cls = cont_cls;
2069 udpw->frag_ctx = NULL;
2070 udpw->msg_type = UMT_MSG_UNFRAGMENTED;
2071 memcpy (udpw->msg_buf, udp, sizeof(struct UDPMessage));
2072 memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)], msgbuf, msgbuf_size);
2073 enqueue (plugin, udpw);
2075 GNUNET_STATISTICS_update (plugin->env->stats,
2076 "# UDP, unfragmented msgs, messages, attempt", 1, GNUNET_NO);
2077 GNUNET_STATISTICS_update (plugin->env->stats,
2078 "# UDP, unfragmented msgs, bytes payload, attempt",
2084 /* fragmented message */
2085 if (s->frag_ctx != NULL)
2086 return GNUNET_SYSERR;
2087 memcpy (&udp[1], msgbuf, msgbuf_size);
2088 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2089 frag_ctx->plugin = plugin;
2090 frag_ctx->session = s;
2091 frag_ctx->cont = cont;
2092 frag_ctx->cont_cls = cont_cls;
2093 frag_ctx->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
2095 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2096 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2097 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2100 s->last_expected_msg_delay,
2101 s->last_expected_ack_delay,
2105 s->frag_ctx = frag_ctx;
2106 GNUNET_STATISTICS_update (plugin->env->stats,
2107 "# UDP, fragmented msgs, messages, pending",
2110 GNUNET_STATISTICS_update (plugin->env->stats,
2111 "# UDP, fragmented msgs, messages, attempt",
2114 GNUNET_STATISTICS_update (plugin->env->stats,
2115 "# UDP, fragmented msgs, bytes payload, attempt",
2116 frag_ctx->payload_size,
2119 notify_session_monitor (s->plugin,
2121 GNUNET_TRANSPORT_SS_UPDATE);
2122 schedule_select (plugin);
2128 * Our external IP address/port mapping has changed.
2130 * @param cls closure, the `struct LocalAddrList`
2131 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
2132 * the previous (now invalid) one
2133 * @param addr either the previous or the new public IP address
2134 * @param addrlen actual lenght of the address
2137 udp_nat_port_map_callback (void *cls,
2139 const struct sockaddr *addr,
2142 struct Plugin *plugin = cls;
2143 struct GNUNET_HELLO_Address *address;
2144 struct IPv4UdpAddress u4;
2145 struct IPv6UdpAddress u6;
2149 LOG (GNUNET_ERROR_TYPE_INFO,
2150 "NAT notification to %s address `%s'\n",
2151 (GNUNET_YES == add_remove) ? "add" : "remove",
2152 GNUNET_a2s (addr, addrlen));
2154 /* convert 'address' to our internal format */
2155 switch (addr->sa_family)
2158 GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
2159 memset (&u4, 0, sizeof(u4));
2160 u4.options = htonl (plugin->myoptions);
2161 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2162 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
2163 if (0 == ((struct sockaddr_in *) addr)->sin_port)
2166 args = sizeof(struct IPv4UdpAddress);
2169 GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
2170 memset (&u6, 0, sizeof(u6));
2171 u6.options = htonl (plugin->myoptions);
2172 if (0 == ((struct sockaddr_in6 *) addr)->sin6_port)
2174 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
2175 sizeof(struct in6_addr));
2176 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
2178 args = sizeof(struct IPv6UdpAddress);
2184 /* modify our published address list */
2185 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
2188 GNUNET_HELLO_ADDRESS_INFO_NONE);
2189 plugin->env->notify_address (plugin->env->cls, add_remove, address);
2190 GNUNET_HELLO_address_free (address);
2195 * Message tokenizer has broken up an incomming message. Pass it on
2198 * @param cls the `struct Plugin *`
2199 * @param client the `struct SourceInformation *`
2200 * @param hdr the actual message
2201 * @return #GNUNET_OK (always)
2204 process_inbound_tokenized_messages (void *cls,
2206 const struct GNUNET_MessageHeader *hdr)
2208 struct Plugin *plugin = cls;
2209 struct SourceInformation *si = client;
2210 struct GNUNET_TIME_Relative delay;
2212 GNUNET_assert (NULL != si->session);
2213 if (GNUNET_YES == si->session->in_destroy)
2216 GNUNET_break (ntohl (si->session->ats.value) != GNUNET_ATS_NET_UNSPECIFIED);
2217 reschedule_session_timeout (si->session);
2218 delay = plugin->env->receive (plugin->env->cls,
2219 si->session->address,
2222 plugin->env->update_address_metrics (plugin->env->cls,
2223 si->session->address,
2225 &si->session->ats, 1);
2226 si->session->flow_delay_for_other_peer = delay;
2232 * We've received a UDP Message. Process it (pass contents to main service).
2234 * @param plugin plugin context
2235 * @param msg the message
2236 * @param udp_addr sender address
2237 * @param udp_addr_len number of bytes in @a udp_addr
2238 * @param network_type network type the address belongs to
2241 process_udp_message (struct Plugin *plugin,
2242 const struct UDPMessage *msg,
2243 const union UdpAddress *udp_addr,
2244 size_t udp_addr_len,
2245 enum GNUNET_ATS_Network_Type network_type)
2247 struct SourceInformation si;
2249 struct GNUNET_HELLO_Address *address;
2251 if (0 != ntohl (msg->reserved))
2256 if (ntohs (msg->header.size)
2257 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2263 address = GNUNET_HELLO_address_allocate (&msg->sender,
2267 GNUNET_HELLO_ADDRESS_INFO_NONE);
2269 (s = udp_plugin_lookup_session (plugin, address)))
2271 s = udp_plugin_create_session (plugin,
2274 plugin->env->session_start (plugin->env->cls,
2279 notify_session_monitor (s->plugin,
2281 GNUNET_TRANSPORT_SS_INIT);
2282 notify_session_monitor (s->plugin,
2284 GNUNET_TRANSPORT_SS_UP);
2286 GNUNET_free (address);
2288 /* iterate over all embedded messages */
2290 si.sender = msg->sender;
2292 GNUNET_SERVER_mst_receive (plugin->mst,
2294 (const char *) &msg[1],
2295 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2299 if ((0 == s->rc) && (GNUNET_YES == s->in_destroy))
2305 * Process a defragmented message.
2307 * @param cls the `struct DefragContext *`
2308 * @param msg the message
2311 fragment_msg_proc (void *cls,
2312 const struct GNUNET_MessageHeader *msg)
2314 struct DefragContext *rc = cls;
2315 const struct UDPMessage *um;
2317 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2322 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2327 um = (const struct UDPMessage *) msg;
2328 rc->sender = um->sender;
2329 rc->have_sender = GNUNET_YES;
2330 process_udp_message (rc->plugin,
2339 * Transmit an acknowledgement.
2341 * @param cls the `struct DefragContext *`
2342 * @param id message ID (unused)
2343 * @param msg ack to transmit
2346 ack_proc (void *cls,
2348 const struct GNUNET_MessageHeader *msg)
2350 struct DefragContext *rc = cls;
2351 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2352 struct UDP_ACK_Message *udp_ack;
2354 struct UDP_MessageWrapper *udpw;
2356 struct GNUNET_HELLO_Address *address;
2358 if (GNUNET_NO == rc->have_sender)
2360 /* tried to defragment but never succeeded, hence will not ACK */
2361 GNUNET_break_op (0);
2364 address = GNUNET_HELLO_address_allocate (&rc->sender,
2368 GNUNET_HELLO_ADDRESS_INFO_NONE);
2369 s = udp_plugin_lookup_session (rc->plugin,
2371 GNUNET_HELLO_address_free (address);
2374 LOG (GNUNET_ERROR_TYPE_ERROR,
2375 "Trying to transmit ACK to peer `%s' but no session found!\n",
2376 udp_address_to_string (rc->plugin,
2379 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2380 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2384 if (s->flow_delay_for_other_peer.rel_value_us <= UINT32_MAX)
2385 delay = s->flow_delay_for_other_peer.rel_value_us;
2387 LOG (GNUNET_ERROR_TYPE_DEBUG,
2388 "Sending ACK to `%s' including delay of %s\n",
2389 udp_address_to_string (rc->plugin,
2392 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2394 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2395 udpw->msg_size = msize;
2396 udpw->payload_size = 0;
2398 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2399 udpw->msg_buf = (char *) &udpw[1];
2400 udpw->msg_type = UMT_MSG_ACK;
2401 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2402 udp_ack->header.size = htons ((uint16_t) msize);
2403 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2404 udp_ack->delay = htonl (delay);
2405 udp_ack->sender = *rc->plugin->env->my_identity;
2406 memcpy (&udp_ack[1], msg, ntohs (msg->size));
2407 enqueue (rc->plugin, udpw);
2408 notify_session_monitor (s->plugin,
2410 GNUNET_TRANSPORT_SS_UPDATE);
2411 schedule_select (rc->plugin);
2416 * Handle an ACK message.
2418 * @param plugin the UDP plugin
2419 * @param msg the (presumed) UDP ACK message
2420 * @param udp_addr sender address
2421 * @param udp_addr_len number of bytes in @a udp_addr
2424 read_process_ack (struct Plugin *plugin,
2425 const struct GNUNET_MessageHeader *msg,
2426 const union UdpAddress *udp_addr,
2427 socklen_t udp_addr_len)
2429 const struct GNUNET_MessageHeader *ack;
2430 const struct UDP_ACK_Message *udp_ack;
2431 struct GNUNET_HELLO_Address *address;
2433 struct GNUNET_TIME_Relative flow_delay;
2435 if (ntohs (msg->size)
2436 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2441 udp_ack = (const struct UDP_ACK_Message *) msg;
2442 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2446 GNUNET_HELLO_ADDRESS_INFO_NONE);
2447 s = udp_plugin_lookup_session (plugin,
2450 (NULL == s->frag_ctx) )
2452 LOG (GNUNET_ERROR_TYPE_WARNING,
2453 "UDP session of address %s for ACK not found\n",
2454 udp_address_to_string (plugin,
2456 address->address_length));
2457 GNUNET_HELLO_address_free (address);
2460 GNUNET_HELLO_address_free (address);
2462 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2463 LOG (GNUNET_ERROR_TYPE_DEBUG,
2464 "We received a sending delay of %s\n",
2465 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2467 s->flow_delay_from_other_peer = GNUNET_TIME_relative_to_absolute (flow_delay);
2469 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2470 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2477 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2480 LOG(GNUNET_ERROR_TYPE_DEBUG,
2481 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2482 (unsigned int ) ntohs (msg->size),
2483 GNUNET_i2s (&udp_ack->sender),
2484 udp_address_to_string (plugin,
2487 /* Expect more ACKs to arrive */
2491 LOG (GNUNET_ERROR_TYPE_DEBUG,
2492 "Message full ACK'ed\n",
2493 (unsigned int ) ntohs (msg->size),
2494 GNUNET_i2s (&udp_ack->sender),
2495 udp_address_to_string (plugin,
2500 /* Remove fragmented message after successful sending */
2501 fragmented_message_done (s->frag_ctx,
2507 * We received a fragment, process it.
2509 * @param plugin our plugin
2510 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2511 * @param udp_addr sender address
2512 * @param udp_addr_len number of bytes in @a udp_addr
2513 * @param network_type network type the address belongs to
2516 read_process_fragment (struct Plugin *plugin,
2517 const struct GNUNET_MessageHeader *msg,
2518 const union UdpAddress *udp_addr,
2519 size_t udp_addr_len,
2520 enum GNUNET_ATS_Network_Type network_type)
2522 struct DefragContext *d_ctx;
2523 struct GNUNET_TIME_Absolute now;
2524 struct FindReceiveContext frc;
2527 frc.udp_addr = udp_addr;
2528 frc.udp_addr_len = udp_addr_len;
2530 /* Lookup existing receive context for this address */
2531 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2532 &find_receive_context,
2534 now = GNUNET_TIME_absolute_get ();
2539 /* Create a new defragmentation context */
2540 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
2544 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
2545 d_ctx->udp_addr_len = udp_addr_len;
2546 d_ctx->network_type = network_type;
2547 d_ctx->plugin = plugin;
2548 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
2550 UDP_MAX_MESSAGES_IN_DEFRAG,
2554 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
2556 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2557 LOG (GNUNET_ERROR_TYPE_DEBUG,
2558 "Created new defragmentation context for %u-byte fragment from `%s'\n",
2559 (unsigned int ) ntohs (msg->size),
2560 udp_address_to_string (plugin,
2566 LOG (GNUNET_ERROR_TYPE_DEBUG,
2567 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
2568 (unsigned int ) ntohs (msg->size),
2569 udp_address_to_string (plugin,
2575 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
2577 /* keep this 'rc' from expiring */
2578 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs,
2580 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2582 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
2583 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
2585 /* remove 'rc' that was inactive the longest */
2586 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
2587 GNUNET_assert (NULL != d_ctx);
2588 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2589 GNUNET_free (d_ctx);
2595 * Read and process a message from the given socket.
2597 * @param plugin the overall plugin
2598 * @param rsock socket to read from
2601 udp_select_read (struct Plugin *plugin,
2602 struct GNUNET_NETWORK_Handle *rsock)
2605 struct sockaddr_storage addr;
2606 char buf[65536] GNUNET_ALIGN;
2608 const struct GNUNET_MessageHeader *msg;
2609 struct IPv4UdpAddress v4;
2610 struct IPv6UdpAddress v6;
2611 const struct sockaddr *sa;
2612 const struct sockaddr_in *sa4;
2613 const struct sockaddr_in6 *sa6;
2614 const union UdpAddress *int_addr;
2615 size_t int_addr_len;
2616 enum GNUNET_ATS_Network_Type network_type;
2618 fromlen = sizeof(addr);
2619 memset (&addr, 0, sizeof(addr));
2620 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof(buf),
2621 (struct sockaddr *) &addr, &fromlen);
2622 sa = (const struct sockaddr *) &addr;
2624 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
2625 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
2626 * on this socket has failed.
2628 * WSAECONNRESET - The virtual circuit was reset by the remote side
2629 * executing a hard or abortive close. The application should close
2630 * the socket; it is no longer usable. On a UDP-datagram socket this
2631 * error indicates a previous send operation resulted in an ICMP Port
2632 * Unreachable message.
2634 if ( (-1 == size) && (ECONNRESET == errno) )
2639 LOG (GNUNET_ERROR_TYPE_DEBUG,
2640 "UDP failed to receive data: %s\n",
2642 /* Connection failure or something. Not a protocol violation. */
2645 if (size < sizeof(struct GNUNET_MessageHeader))
2647 LOG (GNUNET_ERROR_TYPE_WARNING,
2648 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
2649 (unsigned int ) size,
2650 GNUNET_a2s (sa, fromlen));
2651 /* _MAY_ be a connection failure (got partial message) */
2652 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
2656 msg = (const struct GNUNET_MessageHeader *) buf;
2657 LOG (GNUNET_ERROR_TYPE_DEBUG,
2658 "UDP received %u-byte message from `%s' type %u\n",
2659 (unsigned int) size,
2663 if (size != ntohs (msg->size))
2665 LOG (GNUNET_ERROR_TYPE_WARNING,
2666 "UDP malformed message header from %s\n",
2667 (unsigned int) size,
2670 GNUNET_break_op (0);
2673 GNUNET_STATISTICS_update (plugin->env->stats,
2674 "# UDP, total, bytes, received",
2677 network_type = plugin->env->get_address_type (plugin->env->cls,
2680 switch (sa->sa_family)
2683 sa4 = (const struct sockaddr_in *) &addr;
2685 v4.ipv4_addr = sa4->sin_addr.s_addr;
2686 v4.u4_port = sa4->sin_port;
2687 int_addr = (union UdpAddress *) &v4;
2688 int_addr_len = sizeof (v4);
2691 sa6 = (const struct sockaddr_in6 *) &addr;
2693 v6.ipv6_addr = sa6->sin6_addr;
2694 v6.u6_port = sa6->sin6_port;
2695 int_addr = (union UdpAddress *) &v6;
2696 int_addr_len = sizeof (v6);
2703 switch (ntohs (msg->type))
2705 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
2706 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
2707 udp_broadcast_receive (plugin,
2714 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
2715 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2720 process_udp_message (plugin,
2721 (const struct UDPMessage *) msg,
2726 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
2727 read_process_ack (plugin,
2732 case GNUNET_MESSAGE_TYPE_FRAGMENT:
2733 read_process_fragment (plugin,
2749 static struct UDP_MessageWrapper *
2750 remove_timeout_messages_and_select (struct UDP_MessageWrapper *head,
2751 struct GNUNET_NETWORK_Handle *sock)
2753 struct UDP_MessageWrapper *udpw = NULL;
2754 struct GNUNET_TIME_Relative remaining;
2755 struct Session *session;
2756 struct Plugin *plugin;
2759 removed = GNUNET_NO;
2761 while (NULL != udpw)
2763 session = udpw->session;
2764 plugin = session->plugin;
2765 /* Find messages with timeout */
2766 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
2767 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2769 /* Message timed out */
2770 switch (udpw->msg_type)
2772 case UMT_MSG_UNFRAGMENTED:
2773 GNUNET_STATISTICS_update (plugin->env->stats,
2774 "# UDP, total, bytes, sent, timeout",
2777 GNUNET_STATISTICS_update (plugin->env->stats,
2778 "# UDP, total, messages, sent, timeout",
2781 GNUNET_STATISTICS_update (plugin->env->stats,
2782 "# UDP, unfragmented msgs, messages, sent, timeout",
2785 GNUNET_STATISTICS_update (plugin->env->stats,
2786 "# UDP, unfragmented msgs, bytes, sent, timeout",
2789 /* Not fragmented message */
2790 LOG (GNUNET_ERROR_TYPE_DEBUG,
2791 "Message for peer `%s' with size %u timed out\n",
2792 GNUNET_i2s (&udpw->session->target),
2793 udpw->payload_size);
2794 call_continuation (udpw, GNUNET_SYSERR);
2795 /* Remove message */
2796 removed = GNUNET_YES;
2797 dequeue (plugin, udpw);
2800 case UMT_MSG_FRAGMENTED:
2801 /* Fragmented message */
2802 GNUNET_STATISTICS_update (plugin->env->stats,
2803 "# UDP, total, bytes, sent, timeout",
2804 udpw->frag_ctx->on_wire_size,
2806 GNUNET_STATISTICS_update (plugin->env->stats,
2807 "# UDP, total, messages, sent, timeout",
2810 call_continuation (udpw, GNUNET_SYSERR);
2811 LOG (GNUNET_ERROR_TYPE_DEBUG,
2812 "Fragment for message for peer `%s' with size %u timed out\n",
2813 GNUNET_i2s (&udpw->session->target),
2814 udpw->frag_ctx->payload_size);
2816 GNUNET_STATISTICS_update (plugin->env->stats,
2817 "# UDP, fragmented msgs, messages, sent, timeout",
2820 GNUNET_STATISTICS_update (plugin->env->stats,
2821 "# UDP, fragmented msgs, bytes, sent, timeout",
2822 udpw->frag_ctx->payload_size,
2824 /* Remove fragmented message due to timeout */
2825 fragmented_message_done (udpw->frag_ctx, GNUNET_SYSERR);
2828 GNUNET_STATISTICS_update (plugin->env->stats,
2829 "# UDP, total, bytes, sent, timeout",
2832 GNUNET_STATISTICS_update (plugin->env->stats,
2833 "# UDP, total, messages, sent, timeout",
2836 LOG (GNUNET_ERROR_TYPE_DEBUG,
2837 "ACK Message for peer `%s' with size %u timed out\n",
2838 GNUNET_i2s (&udpw->session->target),
2839 udpw->payload_size);
2840 call_continuation (udpw, GNUNET_SYSERR);
2841 removed = GNUNET_YES;
2842 dequeue (plugin, udpw);
2848 if (sock == plugin->sockv4)
2849 udpw = plugin->ipv4_queue_head;
2850 else if (sock == plugin->sockv6)
2851 udpw = plugin->ipv6_queue_head;
2854 GNUNET_break(0); /* should never happen */
2857 GNUNET_STATISTICS_update (plugin->env->stats,
2858 "# messages discarded due to timeout",
2864 /* Message did not time out, check flow delay */
2865 remaining = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
2866 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2868 /* this message is not delayed */
2869 LOG (GNUNET_ERROR_TYPE_DEBUG,
2870 "Message for peer `%s' (%u bytes) is not delayed \n",
2871 GNUNET_i2s (&udpw->session->target),
2872 udpw->payload_size);
2873 break; /* Found message to send, break */
2877 /* Message is delayed, try next */
2878 LOG (GNUNET_ERROR_TYPE_DEBUG,
2879 "Message for peer `%s' (%u bytes) is delayed for %s\n",
2880 GNUNET_i2s (&udpw->session->target), udpw->payload_size,
2881 GNUNET_STRINGS_relative_time_to_string (remaining, GNUNET_YES));
2886 if (GNUNET_YES == removed)
2887 notify_session_monitor (session->plugin,
2889 GNUNET_TRANSPORT_SS_UPDATE);
2898 analyze_send_error (struct Plugin *plugin,
2899 const struct sockaddr *sa,
2900 socklen_t slen, int error)
2902 enum GNUNET_ATS_Network_Type type;
2904 type = plugin->env->get_address_type (plugin->env->cls, sa, slen);
2905 if (((GNUNET_ATS_NET_LAN == type)
2906 || (GNUNET_ATS_NET_WAN == type))
2907 && ((ENETUNREACH == errno)|| (ENETDOWN == errno)))
2909 if (slen == sizeof (struct sockaddr_in))
2911 /* IPv4: "Network unreachable" or "Network down"
2913 * This indicates we do not have connectivity
2915 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2916 _("UDP could not transmit message to `%s': "
2917 "Network seems down, please check your network configuration\n"),
2918 GNUNET_a2s (sa, slen));
2920 if (slen == sizeof (struct sockaddr_in6))
2922 /* IPv6: "Network unreachable" or "Network down"
2924 * This indicates that this system is IPv6 enabled, but does not
2925 * have a valid global IPv6 address assigned or we do not have
2928 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2929 _("UDP could not transmit IPv6 message! "
2930 "Please check your network configuration and disable IPv6 if your "
2931 "connection does not have a global IPv6 address\n"));
2936 LOG (GNUNET_ERROR_TYPE_WARNING,
2937 "UDP could not transmit message to `%s': `%s'\n",
2938 GNUNET_a2s (sa, slen), STRERROR (error));
2947 udp_select_send (struct Plugin *plugin,
2948 struct GNUNET_NETWORK_Handle *sock)
2953 const struct IPv4UdpAddress *u4;
2954 struct sockaddr_in a4;
2955 const struct IPv6UdpAddress *u6;
2956 struct sockaddr_in6 a6;
2957 struct UDP_MessageWrapper *udpw;
2959 /* Find message to send */
2960 udpw = remove_timeout_messages_and_select ((sock == plugin->sockv4)
2961 ? plugin->ipv4_queue_head
2962 : plugin->ipv6_queue_head,
2965 return 0; /* No message to send */
2967 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
2969 u4 = udpw->session->address->address;
2970 memset (&a4, 0, sizeof(a4));
2971 a4.sin_family = AF_INET;
2972 #if HAVE_SOCKADDR_IN_SIN_LEN
2973 a4.sin_len = sizeof (a4);
2975 a4.sin_port = u4->u4_port;
2976 memcpy (&a4.sin_addr, &u4->ipv4_addr, sizeof(struct in_addr));
2977 a = (struct sockaddr *) &a4;
2980 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
2982 u6 = udpw->session->address->address;
2983 memset (&a6, 0, sizeof(a6));
2984 a6.sin6_family = AF_INET6;
2985 #if HAVE_SOCKADDR_IN_SIN_LEN
2986 a6.sin6_len = sizeof (a6);
2988 a6.sin6_port = u6->u6_port;
2989 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
2990 a = (struct sockaddr *) &a6;
2995 call_continuation (udpw, GNUNET_OK);
2996 dequeue (plugin, udpw);
2997 notify_session_monitor (plugin,
2999 GNUNET_TRANSPORT_SS_UPDATE);
3001 return GNUNET_SYSERR;
3004 sent = GNUNET_NETWORK_socket_sendto (sock,
3009 if (GNUNET_SYSERR == sent)
3012 analyze_send_error (plugin, a, slen, errno);
3013 call_continuation (udpw, GNUNET_SYSERR);
3014 GNUNET_STATISTICS_update (plugin->env->stats,
3015 "# UDP, total, bytes, sent, failure", sent, GNUNET_NO);
3016 GNUNET_STATISTICS_update (plugin->env->stats,
3017 "# UDP, total, messages, sent, failure", 1, GNUNET_NO);
3022 LOG (GNUNET_ERROR_TYPE_DEBUG,
3023 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3024 (unsigned int) (udpw->msg_size),
3025 GNUNET_i2s (&udpw->session->target),
3026 GNUNET_a2s (a, slen),
3028 (sent < 0) ? STRERROR (errno) : "ok");
3029 GNUNET_STATISTICS_update (plugin->env->stats,
3030 "# UDP, total, bytes, sent, success",
3033 GNUNET_STATISTICS_update (plugin->env->stats,
3034 "# UDP, total, messages, sent, success",
3037 if (NULL != udpw->frag_ctx)
3038 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3039 call_continuation (udpw, GNUNET_OK);
3041 dequeue (plugin, udpw);
3042 notify_session_monitor (plugin,
3044 GNUNET_TRANSPORT_SS_UPDATE);
3051 * We have been notified that our readset has something to read. We don't
3052 * know which socket needs to be read, so we have to check each one
3053 * Then reschedule this function to be called again once more is available.
3055 * @param cls the plugin handle
3056 * @param tc the scheduling context (for rescheduling this function again)
3059 udp_plugin_select (void *cls,
3060 const struct GNUNET_SCHEDULER_TaskContext *tc)
3062 struct Plugin *plugin = cls;
3064 plugin->select_task = NULL;
3065 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3067 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
3068 && (NULL != plugin->sockv4)
3069 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
3070 udp_select_read (plugin, plugin->sockv4);
3071 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
3072 && (NULL != plugin->sockv4) && (NULL != plugin->ipv4_queue_head)
3073 && (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
3074 udp_select_send (plugin, plugin->sockv4);
3075 schedule_select (plugin);
3080 * We have been notified that our readset has something to read. We don't
3081 * know which socket needs to be read, so we have to check each one
3082 * Then reschedule this function to be called again once more is available.
3084 * @param cls the plugin handle
3085 * @param tc the scheduling context (for rescheduling this function again)
3088 udp_plugin_select_v6 (void *cls,
3089 const struct GNUNET_SCHEDULER_TaskContext *tc)
3091 struct Plugin *plugin = cls;
3093 plugin->select_task_v6 = NULL;
3094 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3096 if (((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
3097 && (NULL != plugin->sockv6)
3098 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
3099 udp_select_read (plugin, plugin->sockv6);
3100 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
3101 && (NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL )&&
3102 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)) )udp_select_send (plugin, plugin->sockv6);
3103 schedule_select (plugin);
3108 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3110 * @param plugin the plugin to initialize
3111 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3112 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3113 * @return number of sockets that were successfully bound
3116 setup_sockets (struct Plugin *plugin,
3117 const struct sockaddr_in6 *bind_v6,
3118 const struct sockaddr_in *bind_v4)
3121 int sockets_created = 0;
3122 struct sockaddr_in6 server_addrv6;
3123 struct sockaddr_in server_addrv4;
3124 struct sockaddr *server_addr;
3125 struct sockaddr *addrs[2];
3126 socklen_t addrlens[2];
3130 /* Create IPv6 socket */
3132 if (GNUNET_YES == plugin->enable_ipv6)
3134 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
3135 if (NULL == plugin->sockv6)
3137 LOG(GNUNET_ERROR_TYPE_WARNING,
3138 "Disabling IPv6 since it is not supported on this system!\n");
3139 plugin->enable_ipv6 = GNUNET_NO;
3143 memset (&server_addrv6, '\0', sizeof(struct sockaddr_in6));
3144 #if HAVE_SOCKADDR_IN_SIN_LEN
3145 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3147 server_addrv6.sin6_family = AF_INET6;
3148 if (NULL != bind_v6)
3149 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3151 server_addrv6.sin6_addr = in6addr_any;
3153 if (0 == plugin->port) /* autodetect */
3154 server_addrv6.sin6_port
3155 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3158 server_addrv6.sin6_port = htons (plugin->port);
3159 addrlen = sizeof(struct sockaddr_in6);
3160 server_addr = (struct sockaddr *) &server_addrv6;
3165 LOG(GNUNET_ERROR_TYPE_DEBUG,
3166 "Binding to IPv6 `%s'\n",
3167 GNUNET_a2s (server_addr, addrlen));
3170 GNUNET_NETWORK_socket_bind (plugin->sockv6,
3175 if (0 != plugin->port)
3177 tries = 10; /* fail immediately */
3178 break; /* bind failed on specific port */
3181 server_addrv6.sin6_port
3182 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3188 GNUNET_NETWORK_socket_close (plugin->sockv6);
3189 plugin->enable_ipv6 = GNUNET_NO;
3190 plugin->sockv6 = NULL;
3194 plugin->port = ntohs (server_addrv6.sin6_port);
3196 if (NULL != plugin->sockv6)
3198 LOG (GNUNET_ERROR_TYPE_DEBUG,
3199 "IPv6 socket created on port %s\n",
3200 GNUNET_a2s (server_addr, addrlen));
3201 addrs[sockets_created] = (struct sockaddr *) &server_addrv6;
3202 addrlens[sockets_created] = sizeof(struct sockaddr_in6);
3207 LOG (GNUNET_ERROR_TYPE_ERROR,
3208 "Failed to bind UDP socket to %s: %s\n",
3209 GNUNET_a2s (server_addr, addrlen),
3215 /* Create IPv4 socket */
3217 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
3218 if (NULL == plugin->sockv4)
3220 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3222 LOG (GNUNET_ERROR_TYPE_WARNING,
3223 "Disabling IPv4 since it is not supported on this system!\n");
3224 plugin->enable_ipv4 = GNUNET_NO;
3228 memset (&server_addrv4, '\0', sizeof(struct sockaddr_in));
3229 #if HAVE_SOCKADDR_IN_SIN_LEN
3230 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3232 server_addrv4.sin_family = AF_INET;
3233 if (NULL != bind_v4)
3234 server_addrv4.sin_addr = bind_v4->sin_addr;
3236 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3238 if (0 == plugin->port)
3240 server_addrv4.sin_port
3241 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3245 server_addrv4.sin_port = htons (plugin->port);
3247 addrlen = sizeof(struct sockaddr_in);
3248 server_addr = (struct sockaddr *) &server_addrv4;
3253 LOG (GNUNET_ERROR_TYPE_DEBUG,
3254 "Binding to IPv4 `%s'\n",
3255 GNUNET_a2s (server_addr, addrlen));
3259 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3264 if (0 != plugin->port)
3266 tries = 10; /* fail */
3267 break; /* bind failed on specific port */
3271 server_addrv4.sin_port
3272 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3278 GNUNET_NETWORK_socket_close (plugin->sockv4);
3279 plugin->enable_ipv4 = GNUNET_NO;
3280 plugin->sockv4 = NULL;
3284 plugin->port = ntohs (server_addrv4.sin_port);
3287 if (NULL != plugin->sockv4)
3289 LOG (GNUNET_ERROR_TYPE_DEBUG,
3290 "IPv4 socket created on port %s\n",
3291 GNUNET_a2s (server_addr, addrlen));
3292 addrs[sockets_created] = (struct sockaddr *) &server_addrv4;
3293 addrlens[sockets_created] = sizeof(struct sockaddr_in);
3298 LOG (GNUNET_ERROR_TYPE_ERROR,
3299 _("Failed to bind UDP socket to %s: %s\n"),
3300 GNUNET_a2s (server_addr, addrlen),
3305 if (0 == sockets_created)
3307 LOG (GNUNET_ERROR_TYPE_WARNING,
3308 _("Failed to open UDP sockets\n"));
3309 return 0; /* No sockets created, return */
3312 /* Create file descriptors */
3313 if (plugin->enable_ipv4 == GNUNET_YES)
3315 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
3316 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
3317 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
3318 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
3319 if (NULL != plugin->sockv4)
3321 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
3322 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
3326 if (plugin->enable_ipv6 == GNUNET_YES)
3328 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
3329 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
3330 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
3331 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
3332 if (NULL != plugin->sockv6)
3334 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
3335 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
3339 schedule_select (plugin);
3340 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3344 (const struct sockaddr **) addrs,
3346 &udp_nat_port_map_callback,
3350 return sockets_created;
3355 * Return information about the given session to the
3358 * @param cls the `struct Plugin` with the monitor callback (`sic`)
3359 * @param peer peer we send information about
3360 * @param value our `struct Session` to send information about
3361 * @return #GNUNET_OK (continue to iterate)
3364 send_session_info_iter (void *cls,
3365 const struct GNUNET_PeerIdentity *peer,
3368 struct Plugin *plugin = cls;
3369 struct Session *session = value;
3371 notify_session_monitor (plugin,
3373 GNUNET_TRANSPORT_SS_INIT);
3374 notify_session_monitor (plugin,
3376 GNUNET_TRANSPORT_SS_UP);
3382 * Begin monitoring sessions of a plugin. There can only
3383 * be one active monitor per plugin (i.e. if there are
3384 * multiple monitors, the transport service needs to
3385 * multiplex the generated events over all of them).
3387 * @param cls closure of the plugin
3388 * @param sic callback to invoke, NULL to disable monitor;
3389 * plugin will being by iterating over all active
3390 * sessions immediately and then enter monitor mode
3391 * @param sic_cls closure for @a sic
3394 udp_plugin_setup_monitor (void *cls,
3395 GNUNET_TRANSPORT_SessionInfoCallback sic,
3398 struct Plugin *plugin = cls;
3401 plugin->sic_cls = sic_cls;
3404 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
3405 &send_session_info_iter,
3407 /* signal end of first iteration */
3408 sic (sic_cls, NULL, NULL);
3414 * The exported method. Makes the core api available via a global and
3415 * returns the udp transport API.
3417 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3418 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3421 libgnunet_plugin_transport_udp_init (void *cls)
3423 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3424 struct GNUNET_TRANSPORT_PluginFunctions *api;
3426 unsigned long long port;
3427 unsigned long long aport;
3428 unsigned long long udp_max_bps;
3429 unsigned long long enable_v6;
3430 unsigned long long enable_broadcasting;
3431 unsigned long long enable_broadcasting_recv;
3432 char *bind4_address;
3433 char *bind6_address;
3434 char *fancy_interval;
3435 struct GNUNET_TIME_Relative interval;
3436 struct sockaddr_in server_addrv4;
3437 struct sockaddr_in6 server_addrv6;
3442 if (NULL == env->receive)
3444 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3445 initialze the plugin or the API */
3446 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3448 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3449 api->address_to_string = &udp_address_to_string;
3450 api->string_to_address = &udp_string_to_address;
3454 /* Get port number: port == 0 : autodetect a port,
3455 * > 0 : use this port, not given : 2086 default */
3457 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3462 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3464 "ADVERTISED_PORT", &aport))
3468 LOG (GNUNET_ERROR_TYPE_WARNING,
3469 _("Given `%s' option is out of range: %llu > %u\n"),
3477 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat", "DISABLEV6"))
3478 enable_v6 = GNUNET_NO;
3480 enable_v6 = GNUNET_YES;
3483 have_bind4 = GNUNET_NO;
3484 memset (&server_addrv4, 0, sizeof(server_addrv4));
3486 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3487 "BINDTO", &bind4_address))
3489 LOG (GNUNET_ERROR_TYPE_DEBUG,
3490 "Binding udp plugin to specific address: `%s'\n",
3492 if (1 != inet_pton (AF_INET,
3494 &server_addrv4.sin_addr))
3496 GNUNET_free (bind4_address);
3499 have_bind4 = GNUNET_YES;
3501 GNUNET_free_non_null(bind4_address);
3502 have_bind6 = GNUNET_NO;
3503 memset (&server_addrv6, 0, sizeof(server_addrv6));
3505 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3506 "BINDTO6", &bind6_address))
3508 LOG (GNUNET_ERROR_TYPE_DEBUG,
3509 "Binding udp plugin to specific address: `%s'\n",
3511 if (1 != inet_pton (AF_INET6,
3513 &server_addrv6.sin6_addr))
3515 LOG (GNUNET_ERROR_TYPE_ERROR,
3516 _("Invalid IPv6 address: `%s'\n"),
3518 GNUNET_free (bind6_address);
3521 have_bind6 = GNUNET_YES;
3523 GNUNET_free_non_null (bind6_address);
3525 /* Enable neighbour discovery */
3526 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3527 "transport-udp", "BROADCAST");
3528 if (enable_broadcasting == GNUNET_SYSERR)
3529 enable_broadcasting = GNUNET_NO;
3531 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3532 "transport-udp", "BROADCAST_RECEIVE");
3533 if (enable_broadcasting_recv == GNUNET_SYSERR)
3534 enable_broadcasting_recv = GNUNET_YES;
3536 if (GNUNET_SYSERR ==
3537 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3538 "BROADCAST_INTERVAL",
3541 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
3545 if (GNUNET_SYSERR ==
3546 GNUNET_STRINGS_fancy_time_to_relative (fancy_interval, &interval))
3548 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30);
3550 GNUNET_free(fancy_interval);
3553 /* Maximum datarate */
3555 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
3556 "MAX_BPS", &udp_max_bps))
3558 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
3561 p = GNUNET_new (struct Plugin);
3564 p->broadcast_interval = interval;
3565 p->enable_ipv6 = enable_v6;
3566 p->enable_ipv4 = GNUNET_YES; /* default */
3567 p->enable_broadcasting = enable_broadcasting;
3568 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3570 p->sessions = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
3571 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (
3572 GNUNET_CONTAINER_HEAP_ORDER_MIN);
3573 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages,
3575 GNUNET_BANDWIDTH_tracker_init (&p->tracker,
3578 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps),
3580 LOG(GNUNET_ERROR_TYPE_DEBUG,
3581 "Setting up sockets\n");
3582 res = setup_sockets (p,
3583 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
3584 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
3585 if ((res == 0) || ((p->sockv4 == NULL )&& (p->sockv6 == NULL)))
3587 LOG (GNUNET_ERROR_TYPE_ERROR,
3588 _("Failed to create network sockets, plugin failed\n"));
3589 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
3590 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
3591 GNUNET_SERVER_mst_destroy (p->mst);
3596 /* Setup broadcasting and receiving beacons */
3597 setup_broadcast (p, &server_addrv6, &server_addrv4);
3599 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3602 api->disconnect_session = &udp_disconnect_session;
3603 api->query_keepalive_factor = &udp_query_keepalive_factor;
3604 api->disconnect_peer = &udp_disconnect;
3605 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3606 api->address_to_string = &udp_address_to_string;
3607 api->string_to_address = &udp_string_to_address;
3608 api->check_address = &udp_plugin_check_address;
3609 api->get_session = &udp_plugin_get_session;
3610 api->send = &udp_plugin_send;
3611 api->get_network = &udp_get_network;
3612 api->update_session_timeout = &udp_plugin_update_session_timeout;
3613 api->setup_monitor = &udp_plugin_setup_monitor;
3619 * Function called on each entry in the defragmentation heap to
3623 * @param node node in the heap (to be removed)
3624 * @param element a `struct DefragContext` to be cleaned up
3625 * @param cost unused
3626 * @return #GNUNET_YES
3629 heap_cleanup_iterator (void *cls,
3630 struct GNUNET_CONTAINER_HeapNode *node,
3632 GNUNET_CONTAINER_HeapCostType cost)
3634 struct DefragContext *d_ctx = element;
3636 GNUNET_CONTAINER_heap_remove_node (node);
3637 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3638 GNUNET_free (d_ctx);
3644 * The exported method. Makes the core api available via a global and
3645 * returns the udp transport API.
3647 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3651 libgnunet_plugin_transport_udp_done (void *cls)
3653 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3654 struct Plugin *plugin = api->cls;
3655 struct PrettyPrinterContext *cur;
3656 struct PrettyPrinterContext *next;
3657 struct UDP_MessageWrapper *udpw;
3664 stop_broadcast (plugin);
3665 if (plugin->select_task != NULL)
3667 GNUNET_SCHEDULER_cancel (plugin->select_task);
3668 plugin->select_task = NULL;
3670 if (plugin->select_task_v6 != NULL)
3672 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
3673 plugin->select_task_v6 = NULL;
3676 /* Closing sockets */
3677 if (GNUNET_YES == plugin->enable_ipv4)
3679 if (NULL != plugin->sockv4)
3681 GNUNET_break (GNUNET_OK ==
3682 GNUNET_NETWORK_socket_close (plugin->sockv4));
3683 plugin->sockv4 = NULL;
3685 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
3686 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
3688 if (GNUNET_YES == plugin->enable_ipv6)
3690 if (NULL != plugin->sockv6)
3692 GNUNET_break (GNUNET_OK ==
3693 GNUNET_NETWORK_socket_close (plugin->sockv6));
3694 plugin->sockv6 = NULL;
3696 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
3697 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
3700 if (NULL != plugin->nat)
3702 GNUNET_NAT_unregister (plugin->nat);
3705 if (NULL != plugin->defrag_ctxs)
3707 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
3708 &heap_cleanup_iterator, NULL);
3709 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
3710 plugin->defrag_ctxs = NULL;
3712 if (NULL != plugin->mst)
3714 GNUNET_SERVER_mst_destroy (plugin->mst);
3718 /* Clean up leftover messages */
3719 udpw = plugin->ipv4_queue_head;
3720 while (NULL != udpw)
3722 struct UDP_MessageWrapper *tmp = udpw->next;
3723 dequeue (plugin, udpw);
3724 call_continuation (udpw, GNUNET_SYSERR);
3728 udpw = plugin->ipv6_queue_head;
3729 while (NULL != udpw)
3731 struct UDP_MessageWrapper *tmp = udpw->next;
3732 dequeue (plugin, udpw);
3733 call_continuation (udpw, GNUNET_SYSERR);
3738 /* Clean up sessions */
3739 LOG (GNUNET_ERROR_TYPE_DEBUG,
3740 "Cleaning up sessions\n");
3741 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
3742 &disconnect_and_free_it, plugin);
3743 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
3745 next = plugin->ppc_dll_head;
3746 for (cur = next; NULL != cur; cur = next)
3750 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
3751 plugin->ppc_dll_tail,
3753 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3756 GNUNET_free (plugin);
3761 /* end of plugin_transport_udp.c */