2 This file is part of GNUnet
3 (C) 2010-2015 Christian Grothoff (and other contributing authors)
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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
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13 General Public License for more details.
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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, &v4->ipv4_addr,
1138 sizeof(struct in_addr)))
1139 return GNUNET_SYSERR;
1143 v6 = (struct IPv6UdpAddress *) addr;
1144 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1147 return GNUNET_SYSERR;
1149 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1150 return GNUNET_SYSERR;
1152 GNUNET_NAT_test_address (plugin->nat,
1154 sizeof(struct in6_addr)))
1155 return GNUNET_SYSERR;
1162 * Function to free last resources associated with a session.
1164 * @param s session to free
1167 free_session (struct Session *s)
1169 if (NULL != s->frag_ctx)
1171 GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag, NULL, NULL );
1172 GNUNET_free(s->frag_ctx);
1180 * Remove a message from the transmission queue.
1182 * @param plugin the UDP plugin
1183 * @param udpw message wrapper to queue
1186 dequeue (struct Plugin *plugin,
1187 struct UDP_MessageWrapper *udpw)
1189 struct Session *session = udpw->session;
1191 if (plugin->bytes_in_buffer < udpw->msg_size)
1197 GNUNET_STATISTICS_update (plugin->env->stats,
1198 "# UDP, total, bytes in buffers",
1199 -(long long) udpw->msg_size,
1201 plugin->bytes_in_buffer -= udpw->msg_size;
1203 GNUNET_STATISTICS_update (plugin->env->stats,
1204 "# UDP, total, msgs in buffers",
1206 if (udpw->session->address->address_length == sizeof(struct IPv4UdpAddress))
1207 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1208 plugin->ipv4_queue_tail,
1210 else if (udpw->session->address->address_length == sizeof(struct IPv6UdpAddress))
1211 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1212 plugin->ipv6_queue_tail,
1219 GNUNET_assert (session->msgs_in_queue > 0);
1220 session->msgs_in_queue--;
1221 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1222 session->bytes_in_queue -= udpw->msg_size;
1230 fragmented_message_done (struct UDP_FragmentationContext *fc,
1233 struct Plugin *plugin = fc->plugin;
1234 struct Session *s = fc->session;
1235 struct UDP_MessageWrapper *udpw;
1236 struct UDP_MessageWrapper *tmp;
1237 struct UDP_MessageWrapper dummy;
1239 LOG (GNUNET_ERROR_TYPE_DEBUG,
1240 "%p : Fragmented message removed with result %s\n",
1242 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1244 /* Call continuation for fragmented message */
1245 memset (&dummy, 0, sizeof(dummy));
1246 dummy.msg_type = UMT_MSG_FRAGMENTED_COMPLETE;
1247 dummy.msg_size = s->frag_ctx->on_wire_size;
1248 dummy.payload_size = s->frag_ctx->payload_size;
1249 dummy.frag_ctx = s->frag_ctx;
1251 dummy.cont_cls = NULL;
1253 call_continuation (&dummy, result);
1254 /* Remove leftover fragments from queue */
1255 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1257 udpw = plugin->ipv6_queue_head;
1258 while (NULL != udpw)
1261 if ((udpw->frag_ctx != NULL )&& (udpw->frag_ctx == s->frag_ctx)){
1262 dequeue (plugin, udpw);
1263 call_continuation (udpw, GNUNET_SYSERR);
1269 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1271 udpw = plugin->ipv4_queue_head;
1272 while (udpw != NULL )
1275 if ((NULL != udpw->frag_ctx) && (udpw->frag_ctx == s->frag_ctx))
1277 dequeue (plugin, udpw);
1278 call_continuation (udpw, GNUNET_SYSERR);
1284 notify_session_monitor (s->plugin,
1286 GNUNET_TRANSPORT_SS_UPDATE);
1287 /* Destroy fragmentation context */
1288 GNUNET_FRAGMENT_context_destroy (fc->frag,
1289 &s->last_expected_msg_delay,
1290 &s->last_expected_ack_delay);
1297 * Scan the heap for a receive context with the given address.
1299 * @param cls the `struct FindReceiveContext`
1300 * @param node internal node of the heap
1301 * @param element value stored at the node (a `struct ReceiveContext`)
1302 * @param cost cost associated with the node
1303 * @return #GNUNET_YES if we should continue to iterate,
1304 * #GNUNET_NO if not.
1307 find_receive_context (void *cls,
1308 struct GNUNET_CONTAINER_HeapNode *node,
1310 GNUNET_CONTAINER_HeapCostType cost)
1312 struct FindReceiveContext *frc = cls;
1313 struct DefragContext *e = element;
1315 if ( (frc->udp_addr_len == e->udp_addr_len) &&
1316 (0 == memcmp (frc->udp_addr,
1318 frc->udp_addr_len)) )
1328 * Functions with this signature are called whenever we need
1329 * to close a session due to a disconnect or failure to
1330 * establish a connection.
1332 * @param cls closure with the `struct Plugin`
1333 * @param s session to close down
1334 * @return #GNUNET_OK on success
1337 udp_disconnect_session (void *cls,
1340 struct Plugin *plugin = cls;
1341 struct UDP_MessageWrapper *udpw;
1342 struct UDP_MessageWrapper *next;
1343 struct FindReceiveContext frc;
1345 GNUNET_assert (GNUNET_YES != s->in_destroy);
1346 LOG (GNUNET_ERROR_TYPE_DEBUG,
1347 "Session %p to peer `%s' address ended\n", s,
1348 GNUNET_i2s (&s->target),
1349 udp_address_to_string (NULL,
1350 s->address->address,
1351 s->address->address_length));
1352 /* stop timeout task */
1353 if (NULL != s->timeout_task)
1355 GNUNET_SCHEDULER_cancel (s->timeout_task);
1356 s->timeout_task = NULL;
1358 if (NULL != s->frag_ctx)
1360 /* Remove fragmented message due to disconnect */
1361 fragmented_message_done (s->frag_ctx,
1366 frc.udp_addr = s->address->address;
1367 frc.udp_addr_len = s->address->address_length;
1368 /* Lookup existing receive context for this address */
1369 if (NULL != plugin->defrag_ctxs)
1371 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1372 &find_receive_context,
1376 struct DefragContext *d_ctx = frc.rc;
1378 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
1379 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1380 GNUNET_free (d_ctx);
1383 next = plugin->ipv4_queue_head;
1384 while (NULL != (udpw = next))
1387 if (udpw->session == s)
1389 dequeue (plugin, udpw);
1390 call_continuation (udpw, GNUNET_SYSERR);
1394 next = plugin->ipv6_queue_head;
1395 while (NULL != (udpw = next))
1398 if (udpw->session == s)
1400 dequeue (plugin, udpw);
1401 call_continuation (udpw, GNUNET_SYSERR);
1405 notify_session_monitor (s->plugin,
1407 GNUNET_TRANSPORT_SS_DONE);
1408 plugin->env->session_end (plugin->env->cls,
1412 if (NULL != s->frag_ctx)
1414 if (NULL != s->frag_ctx->cont)
1416 s->frag_ctx->cont (s->frag_ctx->cont_cls,
1419 s->frag_ctx->payload_size,
1420 s->frag_ctx->on_wire_size);
1421 LOG (GNUNET_ERROR_TYPE_DEBUG,
1422 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
1423 GNUNET_i2s (&s->target));
1427 GNUNET_assert (GNUNET_YES ==
1428 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
1431 GNUNET_STATISTICS_set (plugin->env->stats,
1432 "# UDP sessions active",
1433 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
1437 s->in_destroy = GNUNET_YES;
1441 GNUNET_HELLO_address_free (s->address);
1449 * Function that is called to get the keepalive factor.
1450 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
1451 * calculate the interval between keepalive packets.
1453 * @param cls closure with the `struct Plugin`
1454 * @return keepalive factor
1457 udp_query_keepalive_factor (void *cls)
1464 * Destroy a session, plugin is being unloaded.
1466 * @param cls the `struct Plugin`
1467 * @param key hash of public key of target peer
1468 * @param value a `struct PeerSession *` to clean up
1469 * @return #GNUNET_OK (continue to iterate)
1472 disconnect_and_free_it (void *cls,
1473 const struct GNUNET_PeerIdentity *key,
1476 struct Plugin *plugin = cls;
1478 udp_disconnect_session (plugin, value);
1484 * Disconnect from a remote node. Clean up session if we have one for
1487 * @param cls closure for this call (should be handle to Plugin)
1488 * @param target the peeridentity of the peer to disconnect
1489 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
1492 udp_disconnect (void *cls,
1493 const struct GNUNET_PeerIdentity *target)
1495 struct Plugin *plugin = cls;
1497 LOG (GNUNET_ERROR_TYPE_DEBUG,
1498 "Disconnecting from peer `%s'\n",
1499 GNUNET_i2s (target));
1500 /* Clean up sessions */
1501 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1503 &disconnect_and_free_it,
1509 * Session was idle, so disconnect it
1511 * @param cls the `struct Session` to time out
1512 * @param tc scheduler context
1515 session_timeout (void *cls,
1516 const struct GNUNET_SCHEDULER_TaskContext *tc)
1518 struct Session *s = cls;
1519 struct Plugin *plugin = s->plugin;
1520 struct GNUNET_TIME_Relative left;
1522 s->timeout_task = NULL;
1523 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
1524 if (left.rel_value_us > 0)
1526 /* not actually our turn yet, but let's at least update
1527 the monitor, it may think we're about to die ... */
1528 notify_session_monitor (s->plugin,
1530 GNUNET_TRANSPORT_SS_UPDATE);
1531 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
1536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1537 "Session %p was idle for %s, disconnecting\n",
1539 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
1541 /* call session destroy function */
1542 udp_disconnect_session (plugin, s);
1547 * Increment session timeout due to activity
1549 * @param s session to reschedule timeout activity for
1552 reschedule_session_timeout (struct Session *s)
1554 if (GNUNET_YES == s->in_destroy)
1556 GNUNET_assert(NULL != s->timeout_task);
1557 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1564 static struct Session *
1565 create_session (struct Plugin *plugin,
1566 const struct GNUNET_HELLO_Address *address)
1570 s = GNUNET_new (struct Session);
1572 s->address = GNUNET_HELLO_address_copy (address);
1573 s->target = address->peer;
1574 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1576 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1577 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO_ABS;
1578 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
1579 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1580 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
1581 &session_timeout, s);
1587 * Function obtain the network type for a session
1589 * @param cls closure ('struct Plugin*')
1590 * @param session the session
1591 * @return the network type
1593 static enum GNUNET_ATS_Network_Type
1594 udp_get_network (void *cls,
1595 struct Session *session)
1597 return ntohl (session->ats.value);
1602 * Closure for #session_cmp_it().
1604 struct SessionCompareContext
1607 * Set to session matching the address.
1609 struct Session *res;
1612 * Address we are looking for.
1614 const struct GNUNET_HELLO_Address *address;
1619 * Find a session with a matching address.
1621 * @param cls the `struct SessionCompareContext *`
1622 * @param key peer identity (unused)
1623 * @param value the `struct Session *`
1624 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1627 session_cmp_it (void *cls,
1628 const struct GNUNET_PeerIdentity *key,
1631 struct SessionCompareContext *cctx = cls;
1632 const struct GNUNET_HELLO_Address *address = cctx->address;
1633 struct Session *s = value;
1635 LOG (GNUNET_ERROR_TYPE_DEBUG,
1636 "Comparing address %s <-> %s\n",
1637 udp_address_to_string (NULL,
1639 address->address_length),
1640 udp_address_to_string (NULL,
1641 s->address->address,
1642 s->address->address_length));
1643 if (0 == GNUNET_HELLO_address_cmp(s->address, cctx->address))
1653 * Locate an existing session the transport service is using to
1654 * send data to another peer. Performs some basic sanity checks
1655 * on the address and then tries to locate a matching session.
1657 * @param cls the plugin
1658 * @param address the address we should locate the session by
1659 * @return the session if it exists, or NULL if it is not found
1661 static struct Session *
1662 udp_plugin_lookup_session (void *cls,
1663 const struct GNUNET_HELLO_Address *address)
1665 struct Plugin *plugin = cls;
1666 const struct IPv6UdpAddress *udp_a6;
1667 const struct IPv4UdpAddress *udp_a4;
1668 struct SessionCompareContext cctx;
1670 if ( (NULL == address->address) ||
1671 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
1672 (address->address_length != sizeof (struct IPv6UdpAddress))))
1674 LOG (GNUNET_ERROR_TYPE_WARNING,
1675 _("Trying to locate session for address of unexpected length %u (should be %u or %u)\n"),
1676 address->address_length,
1677 sizeof (struct IPv4UdpAddress),
1678 sizeof (struct IPv6UdpAddress));
1682 if (address->address_length == sizeof(struct IPv4UdpAddress))
1684 if (NULL == plugin->sockv4)
1686 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1687 if (0 == udp_a4->u4_port)
1691 if (address->address_length == sizeof(struct IPv6UdpAddress))
1693 if (NULL == plugin->sockv6)
1695 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1696 if (0 == udp_a6->u6_port)
1700 /* check if session already exists */
1701 cctx.address = address;
1703 LOG (GNUNET_ERROR_TYPE_DEBUG,
1704 "Looking for existing session for peer `%s' `%s' \n",
1705 GNUNET_i2s (&address->peer),
1706 udp_address_to_string(NULL, address->address, address->address_length));
1707 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1711 if (NULL != cctx.res)
1713 LOG (GNUNET_ERROR_TYPE_DEBUG,
1714 "Found existing session %p\n",
1723 * Allocate a new session for the given endpoint address.
1724 * Note that this function does not inform the service
1725 * of the new session, this is the responsibility of the
1726 * caller (if needed).
1728 * @param cls the `struct Plugin`
1729 * @param address address of the other peer to use
1730 * @param network_type network type the address belongs to
1731 * @return NULL on error, otherwise session handle
1733 static struct Session *
1734 udp_plugin_create_session (void *cls,
1735 const struct GNUNET_HELLO_Address *address,
1736 enum GNUNET_ATS_Network_Type network_type)
1738 struct Plugin *plugin = cls;
1741 s = create_session (plugin, address);
1742 s->ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1743 s->ats.value = htonl (network_type);
1746 return NULL; /* protocol not supported or address invalid */
1747 LOG (GNUNET_ERROR_TYPE_DEBUG,
1748 "Creating new session %p for peer `%s' address `%s'\n",
1750 GNUNET_i2s (&address->peer),
1751 udp_address_to_string (plugin,
1753 address->address_length));
1754 GNUNET_assert(GNUNET_OK ==
1755 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
1758 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1759 GNUNET_STATISTICS_set (plugin->env->stats,
1760 "# UDP sessions active",
1761 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
1768 * Function that will be called whenever the transport service wants to
1769 * notify the plugin that a session is still active and in use and
1770 * therefore the session timeout for this session has to be updated
1772 * @param cls closure
1773 * @param peer which peer was the session for
1774 * @param session which session is being updated
1777 udp_plugin_update_session_timeout (void *cls,
1778 const struct GNUNET_PeerIdentity *peer,
1779 struct Session *session)
1781 struct Plugin *plugin = cls;
1784 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1791 /* Reschedule session timeout */
1792 reschedule_session_timeout (session);
1797 * Creates a new outbound session the transport service will use to
1798 * send data to the peer.
1800 * @param cls the plugin
1801 * @param address the address
1802 * @return the session or NULL of max connections exceeded
1804 static struct Session *
1805 udp_plugin_get_session (void *cls,
1806 const struct GNUNET_HELLO_Address *address)
1808 struct Plugin *plugin = cls;
1810 enum GNUNET_ATS_Network_Type network_type;
1811 struct IPv4UdpAddress *udp_v4;
1812 struct IPv6UdpAddress *udp_v6;
1814 if (NULL == address)
1819 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
1820 (address->address_length != sizeof(struct IPv6UdpAddress)) )
1822 if (NULL != (s = udp_plugin_lookup_session (cls,
1826 if (sizeof (struct IPv4UdpAddress) == address->address_length)
1828 struct sockaddr_in v4;
1830 udp_v4 = (struct IPv4UdpAddress *) address->address;
1831 memset (&v4, '\0', sizeof (v4));
1832 v4.sin_family = AF_INET;
1833 #if HAVE_SOCKADDR_IN_SIN_LEN
1834 v4.sin_len = sizeof (struct sockaddr_in);
1836 v4.sin_port = udp_v4->u4_port;
1837 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
1838 network_type = plugin->env->get_address_type (plugin->env->cls,
1839 (const struct sockaddr *) &v4,
1842 else if (sizeof (struct IPv6UdpAddress) == address->address_length)
1844 struct sockaddr_in6 v6;
1846 udp_v6 = (struct IPv6UdpAddress *) address->address;
1847 memset (&v6, '\0', sizeof (v6));
1848 v6.sin6_family = AF_INET6;
1849 #if HAVE_SOCKADDR_IN_SIN_LEN
1850 v6.sin6_len = sizeof (struct sockaddr_in6);
1852 v6.sin6_port = udp_v6->u6_port;
1853 v6.sin6_addr = udp_v6->ipv6_addr;
1854 network_type = plugin->env->get_address_type (plugin->env->cls,
1855 (const struct sockaddr *) &v6,
1859 /* otherwise create new */
1860 return udp_plugin_create_session (cls, address, network_type);
1865 * Enqueue a message for transmission.
1867 * @param plugin the UDP plugin
1868 * @param udpw message wrapper to queue
1871 enqueue (struct Plugin *plugin,
1872 struct UDP_MessageWrapper *udpw)
1874 struct Session *session = udpw->session;
1876 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1882 GNUNET_STATISTICS_update (plugin->env->stats,
1883 "# UDP, total, bytes in buffers", udpw->msg_size, GNUNET_NO);
1884 plugin->bytes_in_buffer += udpw->msg_size;
1886 GNUNET_STATISTICS_update (plugin->env->stats,
1887 "# UDP, total, msgs in buffers",
1889 if (udpw->session->address->address_length == sizeof (struct IPv4UdpAddress))
1890 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1891 plugin->ipv4_queue_tail,
1893 else if (udpw->session->address->address_length == sizeof (struct IPv6UdpAddress))
1894 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1895 plugin->ipv6_queue_tail,
1902 session->msgs_in_queue++;
1903 session->bytes_in_queue += udpw->msg_size;
1908 * Fragment message was transmitted via UDP, let fragmentation know
1909 * to send the next fragment now.
1911 * @param cls the `struct UDPMessageWrapper *` of the fragment
1912 * @param target destination peer (ignored)
1913 * @param result #GNUNET_OK on success (ignored)
1914 * @param payload bytes payload sent
1915 * @param physical bytes physical sent
1918 send_next_fragment (void *cls,
1919 const struct GNUNET_PeerIdentity *target,
1924 struct UDP_MessageWrapper *udpw = cls;
1926 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1931 * Function that is called with messages created by the fragmentation
1932 * module. In the case of the 'proc' callback of the
1933 * #GNUNET_FRAGMENT_context_create() function, this function must
1934 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1936 * @param cls closure, the 'struct FragmentationContext'
1937 * @param msg the message that was created
1940 enqueue_fragment (void *cls,
1941 const struct GNUNET_MessageHeader *msg)
1943 struct UDP_FragmentationContext *frag_ctx = cls;
1944 struct Plugin *plugin = frag_ctx->plugin;
1945 struct UDP_MessageWrapper * udpw;
1946 size_t msg_len = ntohs (msg->size);
1948 LOG (GNUNET_ERROR_TYPE_DEBUG,
1949 "Enqueuing fragment with %u bytes\n",
1951 frag_ctx->fragments_used++;
1952 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1953 udpw->session = frag_ctx->session;
1954 udpw->msg_buf = (char *) &udpw[1];
1955 udpw->msg_size = msg_len;
1956 udpw->payload_size = msg_len; /*FIXME: minus fragment overhead */
1957 udpw->cont = &send_next_fragment;
1958 udpw->cont_cls = udpw;
1959 udpw->timeout = frag_ctx->timeout;
1960 udpw->frag_ctx = frag_ctx;
1961 udpw->msg_type = UMT_MSG_FRAGMENTED;
1962 memcpy (udpw->msg_buf, msg, msg_len);
1963 enqueue (plugin, udpw);
1964 schedule_select (plugin);
1969 * Function that can be used by the transport service to transmit
1970 * a message using the plugin. Note that in the case of a
1971 * peer disconnecting, the continuation MUST be called
1972 * prior to the disconnect notification itself. This function
1973 * will be called with this peer's HELLO message to initiate
1974 * a fresh connection to another peer.
1976 * @param cls closure
1977 * @param s which session must be used
1978 * @param msgbuf the message to transmit
1979 * @param msgbuf_size number of bytes in 'msgbuf'
1980 * @param priority how important is the message (most plugins will
1981 * ignore message priority and just FIFO)
1982 * @param to how long to wait at most for the transmission (does not
1983 * require plugins to discard the message after the timeout,
1984 * just advisory for the desired delay; most plugins will ignore
1986 * @param cont continuation to call once the message has
1987 * been transmitted (or if the transport is ready
1988 * for the next transmission call; or if the
1989 * peer disconnected...); can be NULL
1990 * @param cont_cls closure for cont
1991 * @return number of bytes used (on the physical network, with overheads);
1992 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1993 * and does NOT mean that the message was not transmitted (DV)
1996 udp_plugin_send (void *cls,
2000 unsigned int priority,
2001 struct GNUNET_TIME_Relative to,
2002 GNUNET_TRANSPORT_TransmitContinuation cont,
2005 struct Plugin *plugin = cls;
2006 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2007 struct UDP_FragmentationContext * frag_ctx;
2008 struct UDP_MessageWrapper * udpw;
2009 struct UDPMessage *udp;
2011 GNUNET_assert(plugin != NULL);
2012 GNUNET_assert(s != NULL);
2014 if ( (s->address->address_length == sizeof(struct IPv6UdpAddress)) &&
2015 (plugin->sockv6 == NULL) )
2016 return GNUNET_SYSERR;
2017 if ( (s->address->address_length == sizeof(struct IPv4UdpAddress)) &&
2018 (plugin->sockv4 == NULL) )
2019 return GNUNET_SYSERR;
2020 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2023 return GNUNET_SYSERR;
2026 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2031 return GNUNET_SYSERR;
2033 LOG (GNUNET_ERROR_TYPE_DEBUG,
2034 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2036 GNUNET_i2s (&s->target),
2037 udp_address_to_string (NULL,
2038 s->address->address,
2039 s->address->address_length));
2042 udp = (struct UDPMessage *) mbuf;
2043 udp->header.size = htons (udpmlen);
2044 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2045 udp->reserved = htonl (0);
2046 udp->sender = *plugin->env->my_identity;
2048 /* We do not update the session time out here!
2049 * Otherwise this session will not timeout since we send keep alive before
2050 * session can timeout
2052 * For UDP we update session timeout only on receive, this will cover keep
2053 * alives, since remote peer will reply with keep alive response!
2055 if (udpmlen <= UDP_MTU)
2057 /* unfragmented message */
2058 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2060 udpw->msg_buf = (char *) &udpw[1];
2061 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2062 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2063 udpw->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), to);
2065 udpw->cont_cls = cont_cls;
2066 udpw->frag_ctx = NULL;
2067 udpw->msg_type = UMT_MSG_UNFRAGMENTED;
2068 memcpy (udpw->msg_buf, udp, sizeof(struct UDPMessage));
2069 memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)], msgbuf, msgbuf_size);
2070 enqueue (plugin, udpw);
2072 GNUNET_STATISTICS_update (plugin->env->stats,
2073 "# UDP, unfragmented msgs, messages, attempt", 1, GNUNET_NO);
2074 GNUNET_STATISTICS_update (plugin->env->stats,
2075 "# UDP, unfragmented msgs, bytes payload, attempt",
2081 /* fragmented message */
2082 if (s->frag_ctx != NULL)
2083 return GNUNET_SYSERR;
2084 memcpy (&udp[1], msgbuf, msgbuf_size);
2085 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2086 frag_ctx->plugin = plugin;
2087 frag_ctx->session = s;
2088 frag_ctx->cont = cont;
2089 frag_ctx->cont_cls = cont_cls;
2090 frag_ctx->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
2092 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2093 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2094 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2097 s->last_expected_msg_delay,
2098 s->last_expected_ack_delay,
2102 s->frag_ctx = frag_ctx;
2103 GNUNET_STATISTICS_update (plugin->env->stats,
2104 "# UDP, fragmented msgs, messages, pending",
2107 GNUNET_STATISTICS_update (plugin->env->stats,
2108 "# UDP, fragmented msgs, messages, attempt",
2111 GNUNET_STATISTICS_update (plugin->env->stats,
2112 "# UDP, fragmented msgs, bytes payload, attempt",
2113 frag_ctx->payload_size,
2116 notify_session_monitor (s->plugin,
2118 GNUNET_TRANSPORT_SS_UPDATE);
2119 schedule_select (plugin);
2125 * Our external IP address/port mapping has changed.
2127 * @param cls closure, the `struct LocalAddrList`
2128 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
2129 * the previous (now invalid) one
2130 * @param addr either the previous or the new public IP address
2131 * @param addrlen actual lenght of the address
2134 udp_nat_port_map_callback (void *cls,
2136 const struct sockaddr *addr,
2139 struct Plugin *plugin = cls;
2140 struct GNUNET_HELLO_Address *address;
2141 struct IPv4UdpAddress u4;
2142 struct IPv6UdpAddress u6;
2146 LOG (GNUNET_ERROR_TYPE_INFO,
2147 "NAT notification to %s address `%s'\n",
2148 (GNUNET_YES == add_remove) ? "add" : "remove",
2149 GNUNET_a2s (addr, addrlen));
2151 /* convert 'address' to our internal format */
2152 switch (addr->sa_family)
2155 GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
2156 memset (&u4, 0, sizeof(u4));
2157 u4.options = htonl (plugin->myoptions);
2158 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2159 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
2160 if (0 == ((struct sockaddr_in *) addr)->sin_port)
2163 args = sizeof(struct IPv4UdpAddress);
2166 GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
2167 memset (&u6, 0, sizeof(u6));
2168 u6.options = htonl (plugin->myoptions);
2169 if (0 == ((struct sockaddr_in6 *) addr)->sin6_port)
2171 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
2172 sizeof(struct in6_addr));
2173 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
2175 args = sizeof(struct IPv6UdpAddress);
2181 /* modify our published address list */
2182 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
2185 GNUNET_HELLO_ADDRESS_INFO_NONE);
2186 plugin->env->notify_address (plugin->env->cls, add_remove, address);
2187 GNUNET_HELLO_address_free (address);
2192 * Message tokenizer has broken up an incomming message. Pass it on
2195 * @param cls the `struct Plugin *`
2196 * @param client the `struct SourceInformation *`
2197 * @param hdr the actual message
2198 * @return #GNUNET_OK (always)
2201 process_inbound_tokenized_messages (void *cls,
2203 const struct GNUNET_MessageHeader *hdr)
2205 struct Plugin *plugin = cls;
2206 struct SourceInformation *si = client;
2207 struct GNUNET_TIME_Relative delay;
2209 GNUNET_assert (NULL != si->session);
2210 if (GNUNET_YES == si->session->in_destroy)
2213 GNUNET_break (ntohl (si->session->ats.value) != GNUNET_ATS_NET_UNSPECIFIED);
2214 reschedule_session_timeout (si->session);
2215 delay = plugin->env->receive (plugin->env->cls,
2216 si->session->address,
2219 plugin->env->update_address_metrics (plugin->env->cls,
2220 si->session->address,
2222 &si->session->ats, 1);
2223 si->session->flow_delay_for_other_peer = delay;
2229 * We've received a UDP Message. Process it (pass contents to main service).
2231 * @param plugin plugin context
2232 * @param msg the message
2233 * @param udp_addr sender address
2234 * @param udp_addr_len number of bytes in @a udp_addr
2235 * @param network_type network type the address belongs to
2238 process_udp_message (struct Plugin *plugin,
2239 const struct UDPMessage *msg,
2240 const union UdpAddress *udp_addr,
2241 size_t udp_addr_len,
2242 enum GNUNET_ATS_Network_Type network_type)
2244 struct SourceInformation si;
2246 struct GNUNET_HELLO_Address *address;
2248 if (0 != ntohl (msg->reserved))
2253 if (ntohs (msg->header.size)
2254 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2260 address = GNUNET_HELLO_address_allocate (&msg->sender,
2264 GNUNET_HELLO_ADDRESS_INFO_NONE);
2265 if (NULL == (s = udp_plugin_lookup_session (plugin, address)))
2267 s = udp_plugin_create_session (plugin,
2270 plugin->env->session_start (plugin->env->cls,
2271 address, s, NULL, 0);
2272 notify_session_monitor (s->plugin,
2274 GNUNET_TRANSPORT_SS_INIT);
2275 notify_session_monitor (s->plugin,
2277 GNUNET_TRANSPORT_SS_UP);
2279 GNUNET_free (address);
2281 /* iterate over all embedded messages */
2283 si.sender = msg->sender;
2285 GNUNET_SERVER_mst_receive (plugin->mst,
2287 (const char *) &msg[1],
2288 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2292 if ((0 == s->rc) && (GNUNET_YES == s->in_destroy))
2298 * Process a defragmented message.
2300 * @param cls the `struct DefragContext *`
2301 * @param msg the message
2304 fragment_msg_proc (void *cls,
2305 const struct GNUNET_MessageHeader *msg)
2307 struct DefragContext *rc = cls;
2308 const struct UDPMessage *um;
2310 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2315 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2320 um = (const struct UDPMessage *) msg;
2321 rc->sender = um->sender;
2322 rc->have_sender = GNUNET_YES;
2323 process_udp_message (rc->plugin,
2332 * Transmit an acknowledgement.
2334 * @param cls the `struct DefragContext *`
2335 * @param id message ID (unused)
2336 * @param msg ack to transmit
2339 ack_proc (void *cls,
2341 const struct GNUNET_MessageHeader *msg)
2343 struct DefragContext *rc = cls;
2344 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2345 struct UDP_ACK_Message *udp_ack;
2347 struct UDP_MessageWrapper *udpw;
2349 struct GNUNET_HELLO_Address *address;
2351 if (GNUNET_NO == rc->have_sender)
2353 /* tried to defragment but never succeeded, hence will not ACK */
2354 GNUNET_break_op (0);
2357 address = GNUNET_HELLO_address_allocate (&rc->sender,
2361 GNUNET_HELLO_ADDRESS_INFO_NONE);
2362 s = udp_plugin_lookup_session (rc->plugin,
2364 GNUNET_HELLO_address_free (address);
2367 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2368 "Trying to transmit ACK to peer `%s' but no session found!\n",
2369 udp_address_to_string (rc->plugin,
2372 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2373 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2377 if (s->flow_delay_for_other_peer.rel_value_us <= UINT32_MAX)
2378 delay = s->flow_delay_for_other_peer.rel_value_us;
2380 LOG (GNUNET_ERROR_TYPE_DEBUG,
2381 "Sending ACK to `%s' including delay of %s\n",
2382 udp_address_to_string (rc->plugin,
2385 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2387 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2388 udpw->msg_size = msize;
2389 udpw->payload_size = 0;
2391 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2392 udpw->msg_buf = (char *) &udpw[1];
2393 udpw->msg_type = UMT_MSG_ACK;
2394 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2395 udp_ack->header.size = htons ((uint16_t) msize);
2396 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2397 udp_ack->delay = htonl (delay);
2398 udp_ack->sender = *rc->plugin->env->my_identity;
2399 memcpy (&udp_ack[1], msg, ntohs (msg->size));
2400 enqueue (rc->plugin, udpw);
2401 notify_session_monitor (s->plugin,
2403 GNUNET_TRANSPORT_SS_UPDATE);
2404 schedule_select (rc->plugin);
2409 * Handle an ACK message.
2411 * @param plugin the UDP plugin
2412 * @param msg the (presumed) UDP ACK message
2413 * @param udp_addr sender address
2414 * @param udp_addr_len number of bytes in @a udp_addr
2417 read_process_ack (struct Plugin *plugin,
2418 const struct GNUNET_MessageHeader *msg,
2419 const union UdpAddress *udp_addr,
2420 socklen_t udp_addr_len)
2422 const struct GNUNET_MessageHeader *ack;
2423 const struct UDP_ACK_Message *udp_ack;
2424 struct GNUNET_HELLO_Address *address;
2426 struct GNUNET_TIME_Relative flow_delay;
2428 if (ntohs (msg->size)
2429 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2434 udp_ack = (const struct UDP_ACK_Message *) msg;
2435 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2439 GNUNET_HELLO_ADDRESS_INFO_NONE);
2440 s = udp_plugin_lookup_session (plugin,
2442 GNUNET_HELLO_address_free (address);
2444 (NULL == s->frag_ctx) )
2446 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2447 "UDP session for ACK not found\n");
2451 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2452 LOG (GNUNET_ERROR_TYPE_DEBUG,
2453 "We received a sending delay of %s\n",
2454 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2456 s->flow_delay_from_other_peer = GNUNET_TIME_relative_to_absolute (flow_delay);
2458 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2459 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2466 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2469 LOG(GNUNET_ERROR_TYPE_DEBUG,
2470 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2471 (unsigned int ) ntohs (msg->size),
2472 GNUNET_i2s (&udp_ack->sender),
2473 udp_address_to_string (plugin,
2476 /* Expect more ACKs to arrive */
2480 LOG (GNUNET_ERROR_TYPE_DEBUG,
2481 "Message full ACK'ed\n",
2482 (unsigned int ) ntohs (msg->size),
2483 GNUNET_i2s (&udp_ack->sender),
2484 udp_address_to_string (plugin,
2489 /* Remove fragmented message after successful sending */
2490 fragmented_message_done (s->frag_ctx,
2496 * We received a fragment, process it.
2498 * @param plugin our plugin
2499 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2500 * @param udp_addr sender address
2501 * @param udp_addr_len number of bytes in @a udp_addr
2502 * @param network_type network type the address belongs to
2505 read_process_fragment (struct Plugin *plugin,
2506 const struct GNUNET_MessageHeader *msg,
2507 const union UdpAddress *udp_addr,
2508 size_t udp_addr_len,
2509 enum GNUNET_ATS_Network_Type network_type)
2511 struct DefragContext *d_ctx;
2512 struct GNUNET_TIME_Absolute now;
2513 struct FindReceiveContext frc;
2516 frc.udp_addr = udp_addr;
2517 frc.udp_addr_len = udp_addr_len;
2519 /* Lookup existing receive context for this address */
2520 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2521 &find_receive_context,
2523 now = GNUNET_TIME_absolute_get ();
2528 /* Create a new defragmentation context */
2529 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
2533 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
2534 d_ctx->udp_addr_len = udp_addr_len;
2535 d_ctx->network_type = network_type;
2536 d_ctx->plugin = plugin;
2537 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
2539 UDP_MAX_MESSAGES_IN_DEFRAG,
2543 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
2545 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2546 LOG (GNUNET_ERROR_TYPE_DEBUG,
2547 "Created new defragmentation context for %u-byte fragment from `%s'\n",
2548 (unsigned int ) ntohs (msg->size),
2549 udp_address_to_string (plugin,
2555 LOG (GNUNET_ERROR_TYPE_DEBUG,
2556 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
2557 (unsigned int ) ntohs (msg->size),
2558 udp_address_to_string (plugin,
2564 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
2566 /* keep this 'rc' from expiring */
2567 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs,
2569 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2571 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
2572 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
2574 /* remove 'rc' that was inactive the longest */
2575 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
2576 GNUNET_assert (NULL != d_ctx);
2577 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2578 GNUNET_free (d_ctx);
2584 * Read and process a message from the given socket.
2586 * @param plugin the overall plugin
2587 * @param rsock socket to read from
2590 udp_select_read (struct Plugin *plugin,
2591 struct GNUNET_NETWORK_Handle *rsock)
2594 struct sockaddr_storage addr;
2595 char buf[65536] GNUNET_ALIGN;
2597 const struct GNUNET_MessageHeader *msg;
2598 struct IPv4UdpAddress v4;
2599 struct IPv6UdpAddress v6;
2600 const struct sockaddr *sa;
2601 const struct sockaddr_in *sa4;
2602 const struct sockaddr_in6 *sa6;
2603 const union UdpAddress *int_addr;
2604 size_t int_addr_len;
2605 enum GNUNET_ATS_Network_Type network_type;
2607 fromlen = sizeof(addr);
2608 memset (&addr, 0, sizeof(addr));
2609 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof(buf),
2610 (struct sockaddr *) &addr, &fromlen);
2611 sa = (const struct sockaddr *) &addr;
2613 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
2614 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
2615 * on this socket has failed.
2617 * WSAECONNRESET - The virtual circuit was reset by the remote side
2618 * executing a hard or abortive close. The application should close
2619 * the socket; it is no longer usable. On a UDP-datagram socket this
2620 * error indicates a previous send operation resulted in an ICMP Port
2621 * Unreachable message.
2623 if ( (-1 == size) && (ECONNRESET == errno) )
2628 LOG (GNUNET_ERROR_TYPE_DEBUG,
2629 "UDP failed to receive data: %s\n",
2631 /* Connection failure or something. Not a protocol violation. */
2634 if (size < sizeof(struct GNUNET_MessageHeader))
2636 LOG (GNUNET_ERROR_TYPE_WARNING,
2637 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
2638 (unsigned int ) size,
2639 GNUNET_a2s (sa, fromlen));
2640 /* _MAY_ be a connection failure (got partial message) */
2641 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
2645 msg = (const struct GNUNET_MessageHeader *) buf;
2646 LOG (GNUNET_ERROR_TYPE_DEBUG,
2647 "UDP received %u-byte message from `%s' type %u\n",
2648 (unsigned int) size,
2652 if (size != ntohs (msg->size))
2654 LOG (GNUNET_ERROR_TYPE_WARNING,
2655 "UDP malformed message header from %s\n",
2656 (unsigned int) size,
2659 GNUNET_break_op (0);
2662 GNUNET_STATISTICS_update (plugin->env->stats,
2663 "# UDP, total, bytes, received",
2666 network_type = plugin->env->get_address_type (plugin->env->cls,
2669 switch (sa->sa_family)
2672 sa4 = (const struct sockaddr_in *) &addr;
2674 v4.ipv4_addr = sa4->sin_addr.s_addr;
2675 v4.u4_port = sa4->sin_port;
2676 int_addr = (union UdpAddress *) &v4;
2677 int_addr_len = sizeof (v4);
2680 sa6 = (const struct sockaddr_in6 *) &addr;
2682 v6.ipv6_addr = sa6->sin6_addr;
2683 v6.u6_port = sa6->sin6_port;
2684 int_addr = (union UdpAddress *) &v6;
2685 int_addr_len = sizeof (v6);
2692 switch (ntohs (msg->type))
2694 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
2695 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
2696 udp_broadcast_receive (plugin,
2703 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
2704 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2709 process_udp_message (plugin,
2710 (const struct UDPMessage *) msg,
2715 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
2716 read_process_ack (plugin,
2721 case GNUNET_MESSAGE_TYPE_FRAGMENT:
2722 read_process_fragment (plugin,
2738 static struct UDP_MessageWrapper *
2739 remove_timeout_messages_and_select (struct UDP_MessageWrapper *head,
2740 struct GNUNET_NETWORK_Handle *sock)
2742 struct UDP_MessageWrapper *udpw = NULL;
2743 struct GNUNET_TIME_Relative remaining;
2744 struct Session *session;
2745 struct Plugin *plugin;
2748 removed = GNUNET_NO;
2750 while (NULL != udpw)
2752 session = udpw->session;
2753 plugin = session->plugin;
2754 /* Find messages with timeout */
2755 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
2756 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2758 /* Message timed out */
2759 switch (udpw->msg_type)
2761 case UMT_MSG_UNFRAGMENTED:
2762 GNUNET_STATISTICS_update (plugin->env->stats,
2763 "# UDP, total, bytes, sent, timeout",
2766 GNUNET_STATISTICS_update (plugin->env->stats,
2767 "# UDP, total, messages, sent, timeout",
2770 GNUNET_STATISTICS_update (plugin->env->stats,
2771 "# UDP, unfragmented msgs, messages, sent, timeout",
2774 GNUNET_STATISTICS_update (plugin->env->stats,
2775 "# UDP, unfragmented msgs, bytes, sent, timeout",
2778 /* Not fragmented message */
2779 LOG (GNUNET_ERROR_TYPE_DEBUG,
2780 "Message for peer `%s' with size %u timed out\n",
2781 GNUNET_i2s (&udpw->session->target),
2782 udpw->payload_size);
2783 call_continuation (udpw, GNUNET_SYSERR);
2784 /* Remove message */
2785 removed = GNUNET_YES;
2786 dequeue (plugin, udpw);
2789 case UMT_MSG_FRAGMENTED:
2790 /* Fragmented message */
2791 GNUNET_STATISTICS_update (plugin->env->stats,
2792 "# UDP, total, bytes, sent, timeout",
2793 udpw->frag_ctx->on_wire_size,
2795 GNUNET_STATISTICS_update (plugin->env->stats,
2796 "# UDP, total, messages, sent, timeout",
2799 call_continuation (udpw, GNUNET_SYSERR);
2800 LOG (GNUNET_ERROR_TYPE_DEBUG,
2801 "Fragment for message for peer `%s' with size %u timed out\n",
2802 GNUNET_i2s (&udpw->session->target),
2803 udpw->frag_ctx->payload_size);
2805 GNUNET_STATISTICS_update (plugin->env->stats,
2806 "# UDP, fragmented msgs, messages, sent, timeout",
2809 GNUNET_STATISTICS_update (plugin->env->stats,
2810 "# UDP, fragmented msgs, bytes, sent, timeout",
2811 udpw->frag_ctx->payload_size,
2813 /* Remove fragmented message due to timeout */
2814 fragmented_message_done (udpw->frag_ctx, GNUNET_SYSERR);
2817 GNUNET_STATISTICS_update (plugin->env->stats,
2818 "# UDP, total, bytes, sent, timeout",
2821 GNUNET_STATISTICS_update (plugin->env->stats,
2822 "# UDP, total, messages, sent, timeout",
2825 LOG (GNUNET_ERROR_TYPE_DEBUG,
2826 "ACK Message for peer `%s' with size %u timed out\n",
2827 GNUNET_i2s (&udpw->session->target),
2828 udpw->payload_size);
2829 call_continuation (udpw, GNUNET_SYSERR);
2830 removed = GNUNET_YES;
2831 dequeue (plugin, udpw);
2837 if (sock == plugin->sockv4)
2838 udpw = plugin->ipv4_queue_head;
2839 else if (sock == plugin->sockv6)
2840 udpw = plugin->ipv6_queue_head;
2843 GNUNET_break(0); /* should never happen */
2846 GNUNET_STATISTICS_update (plugin->env->stats,
2847 "# messages discarded due to timeout",
2853 /* Message did not time out, check flow delay */
2854 remaining = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
2855 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2857 /* this message is not delayed */
2858 LOG (GNUNET_ERROR_TYPE_DEBUG,
2859 "Message for peer `%s' (%u bytes) is not delayed \n",
2860 GNUNET_i2s (&udpw->session->target),
2861 udpw->payload_size);
2862 break; /* Found message to send, break */
2866 /* Message is delayed, try next */
2867 LOG (GNUNET_ERROR_TYPE_DEBUG,
2868 "Message for peer `%s' (%u bytes) is delayed for %s\n",
2869 GNUNET_i2s (&udpw->session->target), udpw->payload_size,
2870 GNUNET_STRINGS_relative_time_to_string (remaining, GNUNET_YES));
2875 if (GNUNET_YES == removed)
2876 notify_session_monitor (session->plugin,
2878 GNUNET_TRANSPORT_SS_UPDATE);
2887 analyze_send_error (struct Plugin *plugin,
2888 const struct sockaddr *sa,
2889 socklen_t slen, int error)
2891 enum GNUNET_ATS_Network_Type type;
2893 type = plugin->env->get_address_type (plugin->env->cls, sa, slen);
2894 if (((GNUNET_ATS_NET_LAN == type)
2895 || (GNUNET_ATS_NET_WAN == type))
2896 && ((ENETUNREACH == errno)|| (ENETDOWN == errno)))
2898 if (slen == sizeof (struct sockaddr_in))
2900 /* IPv4: "Network unreachable" or "Network down"
2902 * This indicates we do not have connectivity
2904 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2905 _("UDP could not transmit message to `%s': "
2906 "Network seems down, please check your network configuration\n"),
2907 GNUNET_a2s (sa, slen));
2909 if (slen == sizeof (struct sockaddr_in6))
2911 /* IPv6: "Network unreachable" or "Network down"
2913 * This indicates that this system is IPv6 enabled, but does not
2914 * have a valid global IPv6 address assigned or we do not have
2917 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2918 _("UDP could not transmit IPv6 message! "
2919 "Please check your network configuration and disable IPv6 if your "
2920 "connection does not have a global IPv6 address\n"));
2925 LOG (GNUNET_ERROR_TYPE_WARNING,
2926 "UDP could not transmit message to `%s': `%s'\n",
2927 GNUNET_a2s (sa, slen), STRERROR (error));
2936 udp_select_send (struct Plugin *plugin,
2937 struct GNUNET_NETWORK_Handle *sock)
2942 const struct IPv4UdpAddress *u4;
2943 struct sockaddr_in a4;
2944 const struct IPv6UdpAddress *u6;
2945 struct sockaddr_in6 a6;
2946 struct UDP_MessageWrapper *udpw;
2948 /* Find message to send */
2949 udpw = remove_timeout_messages_and_select ((sock == plugin->sockv4)
2950 ? plugin->ipv4_queue_head
2951 : plugin->ipv6_queue_head,
2954 return 0; /* No message to send */
2956 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
2958 u4 = udpw->session->address->address;
2959 memset (&a4, 0, sizeof(a4));
2960 a4.sin_family = AF_INET;
2961 #if HAVE_SOCKADDR_IN_SIN_LEN
2962 a4.sin_len = sizeof (a4);
2964 a4.sin_port = u4->u4_port;
2965 memcpy (&a4.sin_addr, &u4->ipv4_addr, sizeof(struct in_addr));
2966 a = (struct sockaddr *) &a4;
2969 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
2971 u6 = udpw->session->address->address;
2972 memset (&a6, 0, sizeof(a6));
2973 a6.sin6_family = AF_INET6;
2974 #if HAVE_SOCKADDR_IN_SIN_LEN
2975 a6.sin6_len = sizeof (a6);
2977 a6.sin6_port = u6->u6_port;
2978 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
2979 a = (struct sockaddr *) &a6;
2984 call_continuation (udpw, GNUNET_OK);
2985 dequeue (plugin, udpw);
2986 notify_session_monitor (plugin,
2988 GNUNET_TRANSPORT_SS_UPDATE);
2990 return GNUNET_SYSERR;
2993 sent = GNUNET_NETWORK_socket_sendto (sock,
2998 if (GNUNET_SYSERR == sent)
3001 analyze_send_error (plugin, a, slen, errno);
3002 call_continuation (udpw, GNUNET_SYSERR);
3003 GNUNET_STATISTICS_update (plugin->env->stats,
3004 "# UDP, total, bytes, sent, failure", sent, GNUNET_NO);
3005 GNUNET_STATISTICS_update (plugin->env->stats,
3006 "# UDP, total, messages, sent, failure", 1, GNUNET_NO);
3011 LOG (GNUNET_ERROR_TYPE_DEBUG,
3012 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3013 (unsigned int) (udpw->msg_size),
3014 GNUNET_i2s (&udpw->session->target),
3015 GNUNET_a2s (a, slen),
3017 (sent < 0) ? STRERROR (errno) : "ok");
3018 GNUNET_STATISTICS_update (plugin->env->stats,
3019 "# UDP, total, bytes, sent, success",
3022 GNUNET_STATISTICS_update (plugin->env->stats,
3023 "# UDP, total, messages, sent, success",
3026 if (NULL != udpw->frag_ctx)
3027 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3028 call_continuation (udpw, GNUNET_OK);
3030 dequeue (plugin, udpw);
3031 notify_session_monitor (plugin,
3033 GNUNET_TRANSPORT_SS_UPDATE);
3040 * We have been notified that our readset has something to read. We don't
3041 * know which socket needs to be read, so we have to check each one
3042 * Then reschedule this function to be called again once more is available.
3044 * @param cls the plugin handle
3045 * @param tc the scheduling context (for rescheduling this function again)
3048 udp_plugin_select (void *cls,
3049 const struct GNUNET_SCHEDULER_TaskContext *tc)
3051 struct Plugin *plugin = cls;
3053 plugin->select_task = NULL;
3054 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3056 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
3057 && (NULL != plugin->sockv4)
3058 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
3059 udp_select_read (plugin, plugin->sockv4);
3060 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
3061 && (NULL != plugin->sockv4) && (NULL != plugin->ipv4_queue_head)
3062 && (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
3063 udp_select_send (plugin, plugin->sockv4);
3064 schedule_select (plugin);
3069 * We have been notified that our readset has something to read. We don't
3070 * know which socket needs to be read, so we have to check each one
3071 * Then reschedule this function to be called again once more is available.
3073 * @param cls the plugin handle
3074 * @param tc the scheduling context (for rescheduling this function again)
3077 udp_plugin_select_v6 (void *cls,
3078 const struct GNUNET_SCHEDULER_TaskContext *tc)
3080 struct Plugin *plugin = cls;
3082 plugin->select_task_v6 = NULL;
3083 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3085 if (((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
3086 && (NULL != plugin->sockv6)
3087 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
3088 udp_select_read (plugin, plugin->sockv6);
3089 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
3090 && (NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL )&&
3091 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)) )udp_select_send (plugin, plugin->sockv6);
3092 schedule_select (plugin);
3097 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3099 * @param plugin the plugin to initialize
3100 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3101 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3102 * @return number of sockets that were successfully bound
3105 setup_sockets (struct Plugin *plugin,
3106 const struct sockaddr_in6 *bind_v6,
3107 const struct sockaddr_in *bind_v4)
3110 int sockets_created = 0;
3111 struct sockaddr_in6 server_addrv6;
3112 struct sockaddr_in server_addrv4;
3113 struct sockaddr *server_addr;
3114 struct sockaddr *addrs[2];
3115 socklen_t addrlens[2];
3119 /* Create IPv6 socket */
3121 if (GNUNET_YES == plugin->enable_ipv6)
3123 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
3124 if (NULL == plugin->sockv6)
3126 LOG(GNUNET_ERROR_TYPE_WARNING,
3127 "Disabling IPv6 since it is not supported on this system!\n");
3128 plugin->enable_ipv6 = GNUNET_NO;
3132 memset (&server_addrv6, '\0', sizeof(struct sockaddr_in6));
3133 #if HAVE_SOCKADDR_IN_SIN_LEN
3134 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3136 server_addrv6.sin6_family = AF_INET6;
3137 if (NULL != bind_v6)
3138 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3140 server_addrv6.sin6_addr = in6addr_any;
3142 if (0 == plugin->port) /* autodetect */
3143 server_addrv6.sin6_port = htons (
3144 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3147 server_addrv6.sin6_port = htons (plugin->port);
3148 addrlen = sizeof(struct sockaddr_in6);
3149 server_addr = (struct sockaddr *) &server_addrv6;
3154 LOG(GNUNET_ERROR_TYPE_DEBUG,
3155 "Binding to IPv6 `%s'\n",
3156 GNUNET_a2s (server_addr, addrlen));
3159 == GNUNET_NETWORK_socket_bind (plugin->sockv6, server_addr,
3163 if (0 != plugin->port)
3165 tries = 10; /* fail */
3166 break; /* bind failed on specific port */
3169 server_addrv6.sin6_port = htons (
3170 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3176 GNUNET_NETWORK_socket_close (plugin->sockv6);
3177 plugin->enable_ipv6 = GNUNET_NO;
3178 plugin->sockv6 = NULL;
3181 if (plugin->sockv6 != NULL )
3183 LOG (GNUNET_ERROR_TYPE_DEBUG,
3184 "IPv6 socket created on port %s\n",
3185 GNUNET_a2s (server_addr, addrlen));
3186 addrs[sockets_created] = (struct sockaddr *) &server_addrv6;
3187 addrlens[sockets_created] = sizeof(struct sockaddr_in6);
3192 LOG (GNUNET_ERROR_TYPE_ERROR,
3193 "Failed to bind UDP socket to %s: %s\n",
3194 GNUNET_a2s (server_addr, addrlen),
3200 /* Create IPv4 socket */
3202 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
3203 if (NULL == plugin->sockv4)
3205 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3207 LOG(GNUNET_ERROR_TYPE_WARNING,
3208 "Disabling IPv4 since it is not supported on this system!\n");
3209 plugin->enable_ipv4 = GNUNET_NO;
3213 memset (&server_addrv4, '\0', sizeof(struct sockaddr_in));
3214 #if HAVE_SOCKADDR_IN_SIN_LEN
3215 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3217 server_addrv4.sin_family = AF_INET;
3218 if (NULL != bind_v4)
3219 server_addrv4.sin_addr = bind_v4->sin_addr;
3221 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3223 if (0 == plugin->port)
3225 server_addrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3229 server_addrv4.sin_port = htons (plugin->port);
3231 addrlen = sizeof(struct sockaddr_in);
3232 server_addr = (struct sockaddr *) &server_addrv4;
3237 LOG (GNUNET_ERROR_TYPE_DEBUG,
3238 "Binding to IPv4 `%s'\n",
3239 GNUNET_a2s (server_addr, addrlen));
3243 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3248 if (0 != plugin->port)
3250 tries = 10; /* fail */
3251 break; /* bind failed on specific port */
3255 server_addrv4.sin_port = htons (
3256 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
3263 GNUNET_NETWORK_socket_close (plugin->sockv4);
3264 plugin->enable_ipv4 = GNUNET_NO;
3265 plugin->sockv4 = NULL;
3268 if (NULL != plugin->sockv4)
3270 LOG (GNUNET_ERROR_TYPE_DEBUG,
3271 "IPv4 socket created on port %s\n",
3272 GNUNET_a2s (server_addr, addrlen));
3273 addrs[sockets_created] = (struct sockaddr *) &server_addrv4;
3274 addrlens[sockets_created] = sizeof(struct sockaddr_in);
3279 LOG (GNUNET_ERROR_TYPE_ERROR,
3280 _("Failed to bind UDP socket to %s: %s\n"),
3281 GNUNET_a2s (server_addr, addrlen),
3286 if (0 == sockets_created)
3288 LOG (GNUNET_ERROR_TYPE_WARNING,
3289 _("Failed to open UDP sockets\n"));
3290 return 0; /* No sockets created, return */
3293 /* Create file descriptors */
3294 if (plugin->enable_ipv4 == GNUNET_YES)
3296 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
3297 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
3298 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
3299 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
3300 if (NULL != plugin->sockv4)
3302 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
3303 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
3307 if (plugin->enable_ipv6 == GNUNET_YES)
3309 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
3310 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
3311 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
3312 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
3313 if (NULL != plugin->sockv6)
3315 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
3316 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
3320 schedule_select (plugin);
3321 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3325 (const struct sockaddr **) addrs,
3327 &udp_nat_port_map_callback,
3331 return sockets_created;
3336 * Return information about the given session to the
3339 * @param cls the `struct Plugin` with the monitor callback (`sic`)
3340 * @param peer peer we send information about
3341 * @param value our `struct Session` to send information about
3342 * @return #GNUNET_OK (continue to iterate)
3345 send_session_info_iter (void *cls,
3346 const struct GNUNET_PeerIdentity *peer,
3349 struct Plugin *plugin = cls;
3350 struct Session *session = value;
3352 notify_session_monitor (plugin,
3354 GNUNET_TRANSPORT_SS_INIT);
3355 notify_session_monitor (plugin,
3357 GNUNET_TRANSPORT_SS_UP);
3363 * Begin monitoring sessions of a plugin. There can only
3364 * be one active monitor per plugin (i.e. if there are
3365 * multiple monitors, the transport service needs to
3366 * multiplex the generated events over all of them).
3368 * @param cls closure of the plugin
3369 * @param sic callback to invoke, NULL to disable monitor;
3370 * plugin will being by iterating over all active
3371 * sessions immediately and then enter monitor mode
3372 * @param sic_cls closure for @a sic
3375 udp_plugin_setup_monitor (void *cls,
3376 GNUNET_TRANSPORT_SessionInfoCallback sic,
3379 struct Plugin *plugin = cls;
3382 plugin->sic_cls = sic_cls;
3385 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
3386 &send_session_info_iter,
3388 /* signal end of first iteration */
3389 sic (sic_cls, NULL, NULL);
3395 * The exported method. Makes the core api available via a global and
3396 * returns the udp transport API.
3398 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3399 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3402 libgnunet_plugin_transport_udp_init (void *cls)
3404 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3405 struct GNUNET_TRANSPORT_PluginFunctions *api;
3407 unsigned long long port;
3408 unsigned long long aport;
3409 unsigned long long udp_max_bps;
3410 unsigned long long enable_v6;
3411 unsigned long long enable_broadcasting;
3412 unsigned long long enable_broadcasting_recv;
3413 char *bind4_address;
3414 char *bind6_address;
3415 char *fancy_interval;
3416 struct GNUNET_TIME_Relative interval;
3417 struct sockaddr_in server_addrv4;
3418 struct sockaddr_in6 server_addrv6;
3423 if (NULL == env->receive)
3425 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3426 initialze the plugin or the API */
3427 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3429 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3430 api->address_to_string = &udp_address_to_string;
3431 api->string_to_address = &udp_string_to_address;
3435 /* Get port number: port == 0 : autodetect a port,
3436 * > 0 : use this port, not given : 2086 default */
3438 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3443 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3445 "ADVERTISED_PORT", &aport))
3449 LOG (GNUNET_ERROR_TYPE_WARNING,
3450 _("Given `%s' option is out of range: %llu > %u\n"),
3458 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat", "DISABLEV6"))
3459 enable_v6 = GNUNET_NO;
3461 enable_v6 = GNUNET_YES;
3464 have_bind4 = GNUNET_NO;
3465 memset (&server_addrv4, 0, sizeof(server_addrv4));
3467 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3468 "BINDTO", &bind4_address))
3470 LOG (GNUNET_ERROR_TYPE_DEBUG,
3471 "Binding udp plugin to specific address: `%s'\n",
3473 if (1 != inet_pton (AF_INET,
3475 &server_addrv4.sin_addr))
3477 GNUNET_free (bind4_address);
3480 have_bind4 = GNUNET_YES;
3482 GNUNET_free_non_null(bind4_address);
3483 have_bind6 = GNUNET_NO;
3484 memset (&server_addrv6, 0, sizeof(server_addrv6));
3486 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3487 "BINDTO6", &bind6_address))
3489 LOG (GNUNET_ERROR_TYPE_DEBUG,
3490 "Binding udp plugin to specific address: `%s'\n",
3492 if (1 != inet_pton (AF_INET6,
3494 &server_addrv6.sin6_addr))
3496 LOG (GNUNET_ERROR_TYPE_ERROR,
3497 _("Invalid IPv6 address: `%s'\n"),
3499 GNUNET_free (bind6_address);
3502 have_bind6 = GNUNET_YES;
3504 GNUNET_free_non_null (bind6_address);
3506 /* Enable neighbour discovery */
3507 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3508 "transport-udp", "BROADCAST");
3509 if (enable_broadcasting == GNUNET_SYSERR)
3510 enable_broadcasting = GNUNET_NO;
3512 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3513 "transport-udp", "BROADCAST_RECEIVE");
3514 if (enable_broadcasting_recv == GNUNET_SYSERR)
3515 enable_broadcasting_recv = GNUNET_YES;
3517 if (GNUNET_SYSERR ==
3518 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3519 "BROADCAST_INTERVAL",
3522 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
3526 if (GNUNET_SYSERR ==
3527 GNUNET_STRINGS_fancy_time_to_relative (fancy_interval, &interval))
3529 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30);
3531 GNUNET_free(fancy_interval);
3534 /* Maximum datarate */
3536 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
3537 "MAX_BPS", &udp_max_bps))
3539 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
3542 p = GNUNET_new (struct Plugin);
3545 p->broadcast_interval = interval;
3546 p->enable_ipv6 = enable_v6;
3547 p->enable_ipv4 = GNUNET_YES; /* default */
3548 p->enable_broadcasting = enable_broadcasting;
3549 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3551 p->sessions = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
3552 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (
3553 GNUNET_CONTAINER_HEAP_ORDER_MIN);
3554 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, p);
3555 GNUNET_BANDWIDTH_tracker_init (&p->tracker, NULL, NULL,
3556 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps), 30);
3557 LOG(GNUNET_ERROR_TYPE_DEBUG,
3558 "Setting up sockets\n");
3559 res = setup_sockets (p,
3560 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
3561 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
3562 if ((res == 0) || ((p->sockv4 == NULL )&& (p->sockv6 == NULL)))
3564 LOG (GNUNET_ERROR_TYPE_ERROR,
3565 _("Failed to create network sockets, plugin failed\n"));
3566 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
3567 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
3568 GNUNET_SERVER_mst_destroy (p->mst);
3573 /* Setup broadcasting and receiving beacons */
3574 setup_broadcast (p, &server_addrv6, &server_addrv4);
3576 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3579 api->disconnect_session = &udp_disconnect_session;
3580 api->query_keepalive_factor = &udp_query_keepalive_factor;
3581 api->disconnect_peer = &udp_disconnect;
3582 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3583 api->address_to_string = &udp_address_to_string;
3584 api->string_to_address = &udp_string_to_address;
3585 api->check_address = &udp_plugin_check_address;
3586 api->get_session = &udp_plugin_get_session;
3587 api->send = &udp_plugin_send;
3588 api->get_network = &udp_get_network;
3589 api->update_session_timeout = &udp_plugin_update_session_timeout;
3590 api->setup_monitor = &udp_plugin_setup_monitor;
3596 * Function called on each entry in the defragmentation heap to
3600 * @param node node in the heap (to be removed)
3601 * @param element a `struct DefragContext` to be cleaned up
3602 * @param cost unused
3603 * @return #GNUNET_YES
3606 heap_cleanup_iterator (void *cls,
3607 struct GNUNET_CONTAINER_HeapNode *node,
3609 GNUNET_CONTAINER_HeapCostType cost)
3611 struct DefragContext *d_ctx = element;
3613 GNUNET_CONTAINER_heap_remove_node (node);
3614 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3615 GNUNET_free (d_ctx);
3621 * The exported method. Makes the core api available via a global and
3622 * returns the udp transport API.
3624 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3628 libgnunet_plugin_transport_udp_done (void *cls)
3630 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3631 struct Plugin *plugin = api->cls;
3632 struct PrettyPrinterContext *cur;
3633 struct PrettyPrinterContext *next;
3634 struct UDP_MessageWrapper *udpw;
3641 stop_broadcast (plugin);
3642 if (plugin->select_task != NULL)
3644 GNUNET_SCHEDULER_cancel (plugin->select_task);
3645 plugin->select_task = NULL;
3647 if (plugin->select_task_v6 != NULL)
3649 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
3650 plugin->select_task_v6 = NULL;
3653 /* Closing sockets */
3654 if (GNUNET_YES == plugin->enable_ipv4)
3656 if (NULL != plugin->sockv4)
3658 GNUNET_break (GNUNET_OK ==
3659 GNUNET_NETWORK_socket_close (plugin->sockv4));
3660 plugin->sockv4 = NULL;
3662 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
3663 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
3665 if (GNUNET_YES == plugin->enable_ipv6)
3667 if (NULL != plugin->sockv6)
3669 GNUNET_break (GNUNET_OK ==
3670 GNUNET_NETWORK_socket_close (plugin->sockv6));
3671 plugin->sockv6 = NULL;
3673 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
3674 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
3677 if (NULL != plugin->nat)
3679 GNUNET_NAT_unregister (plugin->nat);
3682 if (NULL != plugin->defrag_ctxs)
3684 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
3685 &heap_cleanup_iterator, NULL);
3686 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
3687 plugin->defrag_ctxs = NULL;
3689 if (NULL != plugin->mst)
3691 GNUNET_SERVER_mst_destroy (plugin->mst);
3695 /* Clean up leftover messages */
3696 udpw = plugin->ipv4_queue_head;
3697 while (NULL != udpw)
3699 struct UDP_MessageWrapper *tmp = udpw->next;
3700 dequeue (plugin, udpw);
3701 call_continuation (udpw, GNUNET_SYSERR);
3705 udpw = plugin->ipv6_queue_head;
3706 while (NULL != udpw)
3708 struct UDP_MessageWrapper *tmp = udpw->next;
3709 dequeue (plugin, udpw);
3710 call_continuation (udpw, GNUNET_SYSERR);
3715 /* Clean up sessions */
3716 LOG (GNUNET_ERROR_TYPE_DEBUG,
3717 "Cleaning up sessions\n");
3718 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
3719 &disconnect_and_free_it, plugin);
3720 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
3722 next = plugin->ppc_dll_head;
3723 for (cur = next; NULL != cur; cur = next)
3727 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
3728 plugin->ppc_dll_tail,
3730 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3733 GNUNET_free (plugin);
3738 /* end of plugin_transport_udp.c */