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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__)
46 * After how much inactivity should a UDP session time out?
48 #define UDP_SESSION_TIME_OUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
51 * Number of messages we can defragment in parallel. We only really
52 * defragment 1 message at a time, but if messages get re-ordered, we
53 * may want to keep knowledge about the previous message to avoid
54 * discarding the current message in favor of a single fragment of a
55 * previous message. 3 should be good since we don't expect massive
56 * message reorderings with UDP.
58 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
61 * We keep a defragmentation queue per sender address. How many
62 * sender addresses do we support at the same time? Memory consumption
63 * is roughly a factor of 32k * #UDP_MAX_MESSAGES_IN_DEFRAG times this
64 * value. (So 128 corresponds to 12 MB and should suffice for
65 * connecting to roughly 128 peers via UDP).
67 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
71 * UDP Message-Packet header (after defragmentation).
78 struct GNUNET_MessageHeader header;
81 * Always zero for now.
86 * What is the identity of the sender
88 struct GNUNET_PeerIdentity sender;
94 * Closure for #append_port().
96 struct PrettyPrinterContext
101 struct PrettyPrinterContext *next;
106 struct PrettyPrinterContext *prev;
111 struct Plugin *plugin;
116 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
119 * Function to call with the result.
121 GNUNET_TRANSPORT_AddressStringCallback asc;
124 * Clsoure for @e asc.
131 struct GNUNET_SCHEDULER_Task *timeout_task;
134 * Is this an IPv6 address?
144 * Port to add after the IP address.
152 * Session with another peer.
154 struct GNUNET_ATS_Session
157 * Which peer is this session for?
159 struct GNUNET_PeerIdentity target;
162 * Plugin this session belongs to.
164 struct Plugin *plugin;
167 * Context for dealing with fragments.
169 struct UDP_FragmentationContext *frag_ctx;
172 * Desired delay for next sending we send to other peer
174 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
177 * Desired delay for transmissions we received from other peer.
178 * This is for full messages, the value needs to be adjusted for
179 * fragmented messages.
181 struct GNUNET_TIME_Relative flow_delay_from_other_peer;
184 * Session timeout task
186 struct GNUNET_SCHEDULER_Task *timeout_task;
189 * When does this session time out?
191 struct GNUNET_TIME_Absolute timeout;
194 * What time did we last transmit?
196 struct GNUNET_TIME_Absolute last_transmit_time;
199 * expected delay for ACKs
201 struct GNUNET_TIME_Relative last_expected_ack_delay;
204 * desired delay between UDP messages
206 struct GNUNET_TIME_Relative last_expected_msg_delay;
211 struct GNUNET_HELLO_Address *address;
214 * Number of bytes waiting for transmission to this peer.
216 unsigned long long bytes_in_queue;
219 * Number of messages waiting for transmission to this peer.
221 unsigned int msgs_in_queue;
224 * Reference counter to indicate that this session is
225 * currently being used and must not be destroyed;
226 * setting @e in_destroy will destroy it as soon as
232 * Network type of the address.
234 enum GNUNET_ATS_Network_Type scope;
237 * Is this session about to be destroyed (sometimes we cannot
238 * destroy a session immediately as below us on the stack
239 * there might be code that still uses it; in this case,
240 * @e rc is non-zero).
248 * Data structure to track defragmentation contexts based
249 * on the source of the UDP traffic.
255 * Defragmentation context.
257 struct GNUNET_DEFRAGMENT_Context *defrag;
260 * Reference to master plugin struct.
262 struct Plugin *plugin;
265 * Node in the defrag heap.
267 struct GNUNET_CONTAINER_HeapNode *hnode;
270 * Source address this receive context is for (allocated at the
271 * end of the struct).
273 const union UdpAddress *udp_addr;
276 * Who's message(s) are we defragmenting here?
277 * Only initialized once we succeeded and
278 * @e have_sender is set.
280 struct GNUNET_PeerIdentity sender;
283 * Length of @e udp_addr.
288 * Network type the address belongs to.
290 enum GNUNET_ATS_Network_Type network_type;
293 * Has the @e sender field been initialized yet?
300 * Context to send fragmented messages
302 struct UDP_FragmentationContext
305 * Next in linked list
307 struct UDP_FragmentationContext *next;
310 * Previous in linked list
312 struct UDP_FragmentationContext *prev;
317 struct Plugin *plugin;
320 * Handle for fragmentation.
322 struct GNUNET_FRAGMENT_Context *frag;
325 * The session this fragmentation context belongs to
327 struct GNUNET_ATS_Session *session;
330 * Function to call upon completion of the transmission.
332 GNUNET_TRANSPORT_TransmitContinuation cont;
335 * Closure for @e cont.
342 struct GNUNET_TIME_Absolute start_time;
345 * Transmission time for the next fragment. Incremented by
346 * the @e flow_delay_from_other_peer for each fragment when
347 * we setup the fragments.
349 struct GNUNET_TIME_Absolute next_frag_time;
352 * Desired delay for transmissions we received from other peer.
353 * Adjusted to be per fragment (UDP_MTU), even though on the
354 * wire it was for "full messages".
356 struct GNUNET_TIME_Relative flow_delay_from_other_peer;
361 struct GNUNET_TIME_Absolute timeout;
364 * Payload size of original unfragmented message
369 * Bytes used to send all fragments on wire including UDP overhead
377 * Function called when a message is removed from the
378 * transmission queue.
381 * @param udpw message wrapper finished
382 * @param result #GNUNET_OK on success (message was sent)
383 * #GNUNET_SYSERR if the target disconnected
384 * or we had a timeout or other trouble sending
387 (*QueueContinuation) (void *cls,
388 struct UDP_MessageWrapper *udpw,
393 * Information we track for each message in the queue.
395 struct UDP_MessageWrapper
398 * Session this message belongs to
400 struct GNUNET_ATS_Session *session;
403 * DLL of messages, previous element
405 struct UDP_MessageWrapper *prev;
408 * DLL of messages, next element
410 struct UDP_MessageWrapper *next;
413 * Message with @e msg_size bytes including UDP-specific overhead.
418 * Function to call once the message wrapper is being removed
419 * from the queue (with success or failure).
421 QueueContinuation qc;
429 * External continuation to call upon completion of the
430 * transmission, NULL if this queue entry is not for a
431 * message from the application.
433 GNUNET_TRANSPORT_TransmitContinuation cont;
436 * Closure for @e cont.
441 * Fragmentation context.
442 * frag_ctx == NULL if transport <= MTU
443 * frag_ctx != NULL if transport > MTU
445 struct UDP_FragmentationContext *frag_ctx;
448 * Message enqueue time.
450 struct GNUNET_TIME_Absolute start_time;
453 * Desired transmission time for this message, based on the
454 * flow limiting information we got from the other peer.
456 struct GNUNET_TIME_Absolute transmission_time;
461 struct GNUNET_TIME_Absolute timeout;
464 * Size of UDP message to send, including UDP-specific overhead.
469 * Payload size of original message.
476 GNUNET_NETWORK_STRUCT_BEGIN
479 * UDP ACK Message-Packet header.
481 struct UDP_ACK_Message
486 struct GNUNET_MessageHeader header;
489 * Desired delay for flow control, in us (in NBO).
490 * A value of UINT32_MAX indicates that the other
491 * peer wants us to disconnect.
493 uint32_t delay GNUNET_PACKED;
496 * What is the identity of the sender
498 struct GNUNET_PeerIdentity sender;
502 GNUNET_NETWORK_STRUCT_END
505 /* ************************* Monitoring *********** */
509 * If a session monitor is attached, notify it about the new
512 * @param plugin our plugin
513 * @param session session that changed state
514 * @param state new state of the session
517 notify_session_monitor (struct Plugin *plugin,
518 struct GNUNET_ATS_Session *session,
519 enum GNUNET_TRANSPORT_SessionState state)
521 struct GNUNET_TRANSPORT_SessionInfo info;
523 if (NULL == plugin->sic)
525 if (GNUNET_YES == session->in_destroy)
526 return; /* already destroyed, just RC>0 left-over actions */
531 info.is_inbound = GNUNET_SYSERR; /* hard to say */
532 info.num_msg_pending = session->msgs_in_queue;
533 info.num_bytes_pending = session->bytes_in_queue;
534 /* info.receive_delay remains zero as this is not supported by UDP
535 (cannot selectively not receive from 'some' peer while continuing
536 to receive from others) */
537 info.session_timeout = session->timeout;
538 info.address = session->address;
539 plugin->sic (plugin->sic_cls,
546 * Return information about the given session to the monitor callback.
548 * @param cls the `struct Plugin` with the monitor callback (`sic`)
549 * @param peer peer we send information about
550 * @param value our `struct GNUNET_ATS_Session` to send information about
551 * @return #GNUNET_OK (continue to iterate)
554 send_session_info_iter (void *cls,
555 const struct GNUNET_PeerIdentity *peer,
558 struct Plugin *plugin = cls;
559 struct GNUNET_ATS_Session *session = value;
561 notify_session_monitor (plugin,
563 GNUNET_TRANSPORT_SS_INIT);
564 notify_session_monitor (plugin,
566 GNUNET_TRANSPORT_SS_UP);
572 * Begin monitoring sessions of a plugin. There can only
573 * be one active monitor per plugin (i.e. if there are
574 * multiple monitors, the transport service needs to
575 * multiplex the generated events over all of them).
577 * @param cls closure of the plugin
578 * @param sic callback to invoke, NULL to disable monitor;
579 * plugin will being by iterating over all active
580 * sessions immediately and then enter monitor mode
581 * @param sic_cls closure for @a sic
584 udp_plugin_setup_monitor (void *cls,
585 GNUNET_TRANSPORT_SessionInfoCallback sic,
588 struct Plugin *plugin = cls;
591 plugin->sic_cls = sic_cls;
594 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
595 &send_session_info_iter,
597 /* signal end of first iteration */
605 /* ****************** Little Helpers ****************** */
609 * Function to free last resources associated with a session.
611 * @param s session to free
614 free_session (struct GNUNET_ATS_Session *s)
616 if (NULL != s->address)
618 GNUNET_HELLO_address_free (s->address);
621 if (NULL != s->frag_ctx)
623 GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag,
626 GNUNET_free (s->frag_ctx);
634 * Function that is called to get the keepalive factor.
635 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
636 * calculate the interval between keepalive packets.
638 * @param cls closure with the `struct Plugin`
639 * @return keepalive factor
642 udp_query_keepalive_factor (void *cls)
649 * Function obtain the network type for a session
651 * @param cls closure (`struct Plugin *`)
652 * @param session the session
653 * @return the network type
655 static enum GNUNET_ATS_Network_Type
656 udp_plugin_get_network (void *cls,
657 struct GNUNET_ATS_Session *session)
659 return session->scope;
664 * Function obtain the network type for an address.
666 * @param cls closure (`struct Plugin *`)
667 * @param address the address
668 * @return the network type
670 static enum GNUNET_ATS_Network_Type
671 udp_plugin_get_network_for_address (void *cls,
672 const struct GNUNET_HELLO_Address *address)
674 struct Plugin *plugin = cls;
676 struct sockaddr_in a4;
677 struct sockaddr_in6 a6;
678 const struct IPv4UdpAddress *u4;
679 const struct IPv6UdpAddress *u6;
683 addrlen = address->address_length;
684 if (addrlen == sizeof(struct IPv6UdpAddress))
686 GNUNET_assert (NULL != address->address); /* make static analysis happy */
687 u6 = address->address;
688 memset (&a6, 0, sizeof(a6));
689 #if HAVE_SOCKADDR_IN_SIN_LEN
690 a6.sin6_len = sizeof (a6);
692 a6.sin6_family = AF_INET6;
693 a6.sin6_port = u6->u6_port;
694 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
698 else if (addrlen == sizeof(struct IPv4UdpAddress))
700 GNUNET_assert (NULL != address->address); /* make static analysis happy */
701 u4 = address->address;
702 memset (&a4, 0, sizeof(a4));
703 #if HAVE_SOCKADDR_IN_SIN_LEN
704 a4.sin_len = sizeof (a4);
706 a4.sin_family = AF_INET;
707 a4.sin_port = u4->u4_port;
708 a4.sin_addr.s_addr = u4->ipv4_addr;
715 return GNUNET_ATS_NET_UNSPECIFIED;
717 return plugin->env->get_address_type (plugin->env->cls,
723 /* ******************* Event loop ******************** */
726 * We have been notified that our readset has something to read. We don't
727 * know which socket needs to be read, so we have to check each one
728 * Then reschedule this function to be called again once more is available.
730 * @param cls the plugin handle
733 udp_plugin_select_v4 (void *cls);
737 * We have been notified that our readset has something to read. We don't
738 * know which socket needs to be read, so we have to check each one
739 * Then reschedule this function to be called again once more is available.
741 * @param cls the plugin handle
744 udp_plugin_select_v6 (void *cls);
748 * (re)schedule IPv4-select tasks for this plugin.
750 * @param plugin plugin to reschedule
753 schedule_select_v4 (struct Plugin *plugin)
755 struct GNUNET_TIME_Relative min_delay;
756 struct GNUNET_TIME_Relative delay;
757 struct UDP_MessageWrapper *udpw;
758 struct UDP_MessageWrapper *min_udpw;
760 if ( (GNUNET_YES == plugin->enable_ipv4) &&
761 (NULL != plugin->sockv4) )
763 /* Find a message ready to send:
764 * Flow delay from other peer is expired or not set (0) */
765 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
767 for (udpw = plugin->ipv4_queue_head; NULL != udpw; udpw = udpw->next)
769 delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
770 if (delay.rel_value_us < min_delay.rel_value_us)
776 if (NULL != plugin->select_task_v4)
777 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
778 if (NULL != min_udpw)
780 if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
782 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
783 "Calculated flow delay for UDPv4 at %s for %s\n",
784 GNUNET_STRINGS_relative_time_to_string (min_delay,
786 GNUNET_i2s (&min_udpw->session->target));
790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
791 "Calculated flow delay for UDPv4 at %s for %s\n",
792 GNUNET_STRINGS_relative_time_to_string (min_delay,
794 GNUNET_i2s (&min_udpw->session->target));
797 plugin->select_task_v4
798 = GNUNET_SCHEDULER_add_read_net (min_delay,
800 &udp_plugin_select_v4,
807 * (re)schedule IPv6-select tasks for this plugin.
809 * @param plugin plugin to reschedule
812 schedule_select_v6 (struct Plugin *plugin)
814 struct GNUNET_TIME_Relative min_delay;
815 struct GNUNET_TIME_Relative delay;
816 struct UDP_MessageWrapper *udpw;
817 struct UDP_MessageWrapper *min_udpw;
819 if ( (GNUNET_YES == plugin->enable_ipv6) &&
820 (NULL != plugin->sockv6) )
822 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
824 for (udpw = plugin->ipv6_queue_head; NULL != udpw; udpw = udpw->next)
826 delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
827 if (delay.rel_value_us < min_delay.rel_value_us)
833 if (NULL != plugin->select_task_v6)
834 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
835 if (NULL != min_udpw)
837 if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
839 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
840 "Calculated flow delay for UDPv6 at %s for %s\n",
841 GNUNET_STRINGS_relative_time_to_string (min_delay,
843 GNUNET_i2s (&min_udpw->session->target));
847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
848 "Calculated flow delay for UDPv6 at %s for %s\n",
849 GNUNET_STRINGS_relative_time_to_string (min_delay,
851 GNUNET_i2s (&min_udpw->session->target));
854 plugin->select_task_v6
855 = GNUNET_SCHEDULER_add_read_net (min_delay,
857 &udp_plugin_select_v6,
863 /* ******************* Address to string and back ***************** */
867 * Function called for a quick conversion of the binary address to
868 * a numeric address. Note that the caller must not free the
869 * address and that the next call to this function is allowed
870 * to override the address again.
873 * @param addr binary address (a `union UdpAddress`)
874 * @param addrlen length of the @a addr
875 * @return string representing the same address
878 udp_address_to_string (void *cls,
882 static char rbuf[INET6_ADDRSTRLEN + 10];
883 char buf[INET6_ADDRSTRLEN];
887 const struct IPv4UdpAddress *t4;
888 const struct IPv6UdpAddress *t6;
899 if (addrlen == sizeof(struct IPv6UdpAddress))
903 options = ntohl (t6->options);
904 port = ntohs (t6->u6_port);
908 else if (addrlen == sizeof(struct IPv4UdpAddress))
912 options = ntohl (t4->options);
913 port = ntohs (t4->u4_port);
914 a4.s_addr = t4->ipv4_addr;
926 GNUNET_snprintf (rbuf,
940 * Function called to convert a string address to a binary address.
942 * @param cls closure (`struct Plugin *`)
943 * @param addr string address
944 * @param addrlen length of the address
945 * @param buf location to store the buffer
946 * @param added location to store the number of bytes in the buffer.
947 * If the function returns #GNUNET_SYSERR, its contents are undefined.
948 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
951 udp_string_to_address (void *cls,
957 struct sockaddr_storage socket_address;
963 /* Format tcp.options.address:port */
968 if ((NULL == addr) || (0 == addrlen))
971 return GNUNET_SYSERR;
973 if ('\0' != addr[addrlen - 1])
976 return GNUNET_SYSERR;
978 if (strlen (addr) != addrlen - 1)
981 return GNUNET_SYSERR;
983 plugin = GNUNET_strdup (addr);
984 optionstr = strchr (plugin, '.');
985 if (NULL == optionstr)
988 GNUNET_free (plugin);
989 return GNUNET_SYSERR;
993 options = atol (optionstr);
994 address = strchr (optionstr, '.');
998 GNUNET_free (plugin);
999 return GNUNET_SYSERR;
1005 GNUNET_STRINGS_to_address_ip (address,
1010 GNUNET_free (plugin);
1011 return GNUNET_SYSERR;
1013 GNUNET_free(plugin);
1015 switch (socket_address.ss_family)
1019 struct IPv4UdpAddress *u4;
1020 const struct sockaddr_in *in4 = (const struct sockaddr_in *) &socket_address;
1022 u4 = GNUNET_new (struct IPv4UdpAddress);
1023 u4->options = htonl (options);
1024 u4->ipv4_addr = in4->sin_addr.s_addr;
1025 u4->u4_port = in4->sin_port;
1027 *added = sizeof (struct IPv4UdpAddress);
1032 struct IPv6UdpAddress *u6;
1033 const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) &socket_address;
1035 u6 = GNUNET_new (struct IPv6UdpAddress);
1036 u6->options = htonl (options);
1037 u6->ipv6_addr = in6->sin6_addr;
1038 u6->u6_port = in6->sin6_port;
1040 *added = sizeof (struct IPv6UdpAddress);
1045 return GNUNET_SYSERR;
1051 * Append our port and forward the result.
1053 * @param cls a `struct PrettyPrinterContext *`
1054 * @param hostname result from DNS resolver
1057 append_port (void *cls,
1058 const char *hostname)
1060 struct PrettyPrinterContext *ppc = cls;
1061 struct Plugin *plugin = ppc->plugin;
1064 if (NULL == hostname)
1066 /* Final call, done */
1067 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
1068 plugin->ppc_dll_tail,
1070 ppc->resolver_handle = NULL;
1071 ppc->asc (ppc->asc_cls,
1077 if (GNUNET_YES == ppc->ipv6)
1078 GNUNET_asprintf (&ret,
1085 GNUNET_asprintf (&ret,
1091 ppc->asc (ppc->asc_cls,
1099 * Convert the transports address to a nice, human-readable format.
1101 * @param cls closure with the `struct Plugin *`
1102 * @param type name of the transport that generated the address
1103 * @param addr one of the addresses of the host, NULL for the last address
1104 * the specific address format depends on the transport;
1105 * a `union UdpAddress`
1106 * @param addrlen length of the address
1107 * @param numeric should (IP) addresses be displayed in numeric form?
1108 * @param timeout after how long should we give up?
1109 * @param asc function to call on each string
1110 * @param asc_cls closure for @a asc
1113 udp_plugin_address_pretty_printer (void *cls,
1118 struct GNUNET_TIME_Relative timeout,
1119 GNUNET_TRANSPORT_AddressStringCallback asc,
1122 struct Plugin *plugin = cls;
1123 struct PrettyPrinterContext *ppc;
1124 const struct sockaddr *sb;
1126 struct sockaddr_in a4;
1127 struct sockaddr_in6 a6;
1128 const struct IPv4UdpAddress *u4;
1129 const struct IPv6UdpAddress *u6;
1133 if (addrlen == sizeof(struct IPv6UdpAddress))
1139 a6.sin6_family = AF_INET6;
1140 #if HAVE_SOCKADDR_IN_SIN_LEN
1141 a6.sin6_len = sizeof (a6);
1143 a6.sin6_port = u6->u6_port;
1144 a6.sin6_addr = u6->ipv6_addr;
1145 port = ntohs (u6->u6_port);
1146 options = ntohl (u6->options);
1147 sb = (const struct sockaddr *) &a6;
1150 else if (addrlen == sizeof (struct IPv4UdpAddress))
1156 a4.sin_family = AF_INET;
1157 #if HAVE_SOCKADDR_IN_SIN_LEN
1158 a4.sin_len = sizeof (a4);
1160 a4.sin_port = u4->u4_port;
1161 a4.sin_addr.s_addr = u4->ipv4_addr;
1162 port = ntohs (u4->u4_port);
1163 options = ntohl (u4->options);
1164 sb = (const struct sockaddr *) &a4;
1169 /* invalid address */
1170 GNUNET_break_op (0);
1179 ppc = GNUNET_new (struct PrettyPrinterContext);
1180 ppc->plugin = plugin;
1182 ppc->asc_cls = asc_cls;
1184 ppc->options = options;
1185 if (addrlen == sizeof (struct IPv6UdpAddress))
1186 ppc->ipv6 = GNUNET_YES;
1188 ppc->ipv6 = GNUNET_NO;
1189 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
1190 plugin->ppc_dll_tail,
1192 ppc->resolver_handle
1193 = GNUNET_RESOLVER_hostname_get (sb,
1203 * Check if the given port is plausible (must be either our listen
1204 * port or our advertised port). If it is neither, we return
1207 * @param plugin global variables
1208 * @param in_port port number to check
1209 * @return #GNUNET_OK if port is either our open or advertised port
1212 check_port (const struct Plugin *plugin,
1215 if ( (plugin->port == in_port) ||
1216 (plugin->aport == in_port) )
1218 return GNUNET_SYSERR;
1223 * Function that will be called to check if a binary address for this
1224 * plugin is well-formed and corresponds to an address for THIS peer
1225 * (as per our configuration). Naturally, if absolutely necessary,
1226 * plugins can be a bit conservative in their answer, but in general
1227 * plugins should make sure that the address does not redirect
1228 * traffic to a 3rd party that might try to man-in-the-middle our
1231 * @param cls closure, should be our handle to the Plugin
1232 * @param addr pointer to a `union UdpAddress`
1233 * @param addrlen length of @a addr
1234 * @return #GNUNET_OK if this is a plausible address for this peer
1235 * and transport, #GNUNET_SYSERR if not
1238 udp_plugin_check_address (void *cls,
1242 struct Plugin *plugin = cls;
1243 const struct IPv4UdpAddress *v4;
1244 const struct IPv6UdpAddress *v6;
1246 if (sizeof(struct IPv4UdpAddress) == addrlen)
1248 v4 = (const struct IPv4UdpAddress *) addr;
1249 if (GNUNET_OK != check_port (plugin,
1250 ntohs (v4->u4_port)))
1251 return GNUNET_SYSERR;
1253 GNUNET_NAT_test_address (plugin->nat,
1255 sizeof (struct in_addr)))
1256 return GNUNET_SYSERR;
1258 else if (sizeof(struct IPv6UdpAddress) == addrlen)
1260 v6 = (const struct IPv6UdpAddress *) addr;
1261 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1263 GNUNET_break_op (0);
1264 return GNUNET_SYSERR;
1266 if (GNUNET_OK != check_port (plugin,
1267 ntohs (v6->u6_port)))
1268 return GNUNET_SYSERR;
1270 GNUNET_NAT_test_address (plugin->nat,
1272 sizeof (struct in6_addr)))
1273 return GNUNET_SYSERR;
1277 GNUNET_break_op (0);
1278 return GNUNET_SYSERR;
1285 * Our external IP address/port mapping has changed.
1287 * @param cls closure, the `struct Plugin`
1288 * @param add_remove #GNUNET_YES to mean the new public IP address,
1289 * #GNUNET_NO to mean the previous (now invalid) one
1290 * @param addr either the previous or the new public IP address
1291 * @param addrlen actual length of the @a addr
1294 udp_nat_port_map_callback (void *cls,
1296 const struct sockaddr *addr,
1299 struct Plugin *plugin = cls;
1300 struct GNUNET_HELLO_Address *address;
1301 struct IPv4UdpAddress u4;
1302 struct IPv6UdpAddress u6;
1306 LOG (GNUNET_ERROR_TYPE_DEBUG,
1307 (GNUNET_YES == add_remove)
1308 ? "NAT notification to add address `%s'\n"
1309 : "NAT notification to remove address `%s'\n",
1312 /* convert 'address' to our internal format */
1313 switch (addr->sa_family)
1317 const struct sockaddr_in *i4;
1319 GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
1320 i4 = (const struct sockaddr_in *) addr;
1321 if (0 == ntohs (i4->sin_port))
1329 u4.options = htonl (plugin->myoptions);
1330 u4.ipv4_addr = i4->sin_addr.s_addr;
1331 u4.u4_port = i4->sin_port;
1333 args = sizeof (struct IPv4UdpAddress);
1338 const struct sockaddr_in6 *i6;
1340 GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
1341 i6 = (const struct sockaddr_in6 *) addr;
1342 if (0 == ntohs (i6->sin6_port))
1350 u6.options = htonl (plugin->myoptions);
1351 u6.ipv6_addr = i6->sin6_addr;
1352 u6.u6_port = i6->sin6_port;
1354 args = sizeof (struct IPv6UdpAddress);
1361 /* modify our published address list */
1362 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1366 GNUNET_HELLO_ADDRESS_INFO_NONE);
1367 plugin->env->notify_address (plugin->env->cls,
1370 GNUNET_HELLO_address_free (address);
1374 /* ********************* Finding sessions ******************* */
1378 * Closure for #session_cmp_it().
1380 struct GNUNET_ATS_SessionCompareContext
1383 * Set to session matching the address.
1385 struct GNUNET_ATS_Session *res;
1388 * Address we are looking for.
1390 const struct GNUNET_HELLO_Address *address;
1395 * Find a session with a matching address.
1397 * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
1398 * @param key peer identity (unused)
1399 * @param value the `struct GNUNET_ATS_Session *`
1400 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1403 session_cmp_it (void *cls,
1404 const struct GNUNET_PeerIdentity *key,
1407 struct GNUNET_ATS_SessionCompareContext *cctx = cls;
1408 struct GNUNET_ATS_Session *s = value;
1410 if (0 == GNUNET_HELLO_address_cmp (s->address,
1413 GNUNET_assert (GNUNET_NO == s->in_destroy);
1422 * Locate an existing session the transport service is using to
1423 * send data to another peer. Performs some basic sanity checks
1424 * on the address and then tries to locate a matching session.
1426 * @param cls the plugin
1427 * @param address the address we should locate the session by
1428 * @return the session if it exists, or NULL if it is not found
1430 static struct GNUNET_ATS_Session *
1431 udp_plugin_lookup_session (void *cls,
1432 const struct GNUNET_HELLO_Address *address)
1434 struct Plugin *plugin = cls;
1435 const struct IPv6UdpAddress *udp_a6;
1436 const struct IPv4UdpAddress *udp_a4;
1437 struct GNUNET_ATS_SessionCompareContext cctx;
1439 if (NULL == address->address)
1444 if (sizeof(struct IPv4UdpAddress) == address->address_length)
1446 if (NULL == plugin->sockv4)
1448 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1449 if (0 == udp_a4->u4_port)
1455 else if (sizeof(struct IPv6UdpAddress) == address->address_length)
1457 if (NULL == plugin->sockv6)
1459 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1460 if (0 == udp_a6->u6_port)
1472 /* check if session already exists */
1473 cctx.address = address;
1475 LOG (GNUNET_ERROR_TYPE_DEBUG,
1476 "Looking for existing session for peer `%s' with address `%s'\n",
1477 GNUNET_i2s (&address->peer),
1478 udp_address_to_string (plugin,
1480 address->address_length));
1481 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1485 if (NULL == cctx.res)
1487 LOG (GNUNET_ERROR_TYPE_DEBUG,
1488 "Found existing session %p\n",
1494 /* ********************** Timeout ****************** */
1498 * Increment session timeout due to activity.
1500 * @param s session to reschedule timeout activity for
1503 reschedule_session_timeout (struct GNUNET_ATS_Session *s)
1505 if (GNUNET_YES == s->in_destroy)
1507 GNUNET_assert (NULL != s->timeout_task);
1508 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1514 * Function that will be called whenever the transport service wants to
1515 * notify the plugin that a session is still active and in use and
1516 * therefore the session timeout for this session has to be updated
1518 * @param cls closure with the `struct Plugin`
1519 * @param peer which peer was the session for
1520 * @param session which session is being updated
1523 udp_plugin_update_session_timeout (void *cls,
1524 const struct GNUNET_PeerIdentity *peer,
1525 struct GNUNET_ATS_Session *session)
1527 struct Plugin *plugin = cls;
1530 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1537 /* Reschedule session timeout */
1538 reschedule_session_timeout (session);
1542 /* ************************* Sending ************************ */
1546 * Remove the given message from the transmission queue and
1547 * update all applicable statistics.
1549 * @param plugin the UDP plugin
1550 * @param udpw message wrapper to dequeue
1553 dequeue (struct Plugin *plugin,
1554 struct UDP_MessageWrapper *udpw)
1556 struct GNUNET_ATS_Session *session = udpw->session;
1558 if (plugin->bytes_in_buffer < udpw->msg_size)
1564 GNUNET_STATISTICS_update (plugin->env->stats,
1565 "# UDP, total bytes in send buffers",
1566 - (long long) udpw->msg_size,
1568 plugin->bytes_in_buffer -= udpw->msg_size;
1570 GNUNET_STATISTICS_update (plugin->env->stats,
1571 "# UDP, total messages in send buffers",
1574 if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length)
1576 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1577 plugin->ipv4_queue_tail,
1580 else if (sizeof(struct IPv6UdpAddress) == udpw->session->address->address_length)
1582 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1583 plugin->ipv6_queue_tail,
1591 GNUNET_assert (session->msgs_in_queue > 0);
1592 session->msgs_in_queue--;
1593 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1594 session->bytes_in_queue -= udpw->msg_size;
1599 * Enqueue a message for transmission and update statistics.
1601 * @param plugin the UDP plugin
1602 * @param udpw message wrapper to queue
1605 enqueue (struct Plugin *plugin,
1606 struct UDP_MessageWrapper *udpw)
1608 struct GNUNET_ATS_Session *session = udpw->session;
1610 if (GNUNET_YES == session->in_destroy)
1615 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1621 GNUNET_STATISTICS_update (plugin->env->stats,
1622 "# UDP, total bytes in send buffers",
1625 plugin->bytes_in_buffer += udpw->msg_size;
1627 GNUNET_STATISTICS_update (plugin->env->stats,
1628 "# UDP, total messages in send buffers",
1631 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
1633 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1634 plugin->ipv4_queue_tail,
1637 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
1639 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1640 plugin->ipv6_queue_tail,
1646 udpw->cont (udpw->cont_cls,
1654 session->msgs_in_queue++;
1655 session->bytes_in_queue += udpw->msg_size;
1660 * We have completed our (attempt) to transmit a message that had to
1661 * be fragmented -- either because we got an ACK saying that all
1662 * fragments were received, or because of timeout / disconnect. Clean
1665 * @param frag_ctx fragmentation context to clean up
1666 * @param result #GNUNET_OK if we succeeded (got ACK),
1667 * #GNUNET_SYSERR if the transmission failed
1670 fragmented_message_done (struct UDP_FragmentationContext *frag_ctx,
1673 struct Plugin *plugin = frag_ctx->plugin;
1674 struct GNUNET_ATS_Session *s = frag_ctx->session;
1675 struct UDP_MessageWrapper *udpw;
1676 struct UDP_MessageWrapper *tmp;
1678 struct GNUNET_TIME_Relative delay;
1680 LOG (GNUNET_ERROR_TYPE_DEBUG,
1681 "%p: Fragmented message removed with result %s\n",
1683 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1684 /* Call continuation for fragmented message */
1685 if (frag_ctx->on_wire_size >= frag_ctx->payload_size)
1686 overhead = frag_ctx->on_wire_size - frag_ctx->payload_size;
1688 overhead = frag_ctx->on_wire_size;
1689 delay = GNUNET_TIME_absolute_get_duration (frag_ctx->start_time);
1690 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1692 LOG (GNUNET_ERROR_TYPE_WARNING,
1693 "Fragmented message acknowledged after %s (expected at %s)\n",
1694 GNUNET_STRINGS_relative_time_to_string (delay,
1696 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1700 LOG (GNUNET_ERROR_TYPE_DEBUG,
1701 "Fragmented message acknowledged after %s (expected at %s)\n",
1702 GNUNET_STRINGS_relative_time_to_string (delay,
1704 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1707 if (NULL != frag_ctx->cont)
1708 frag_ctx->cont (frag_ctx->cont_cls,
1711 s->frag_ctx->payload_size,
1712 frag_ctx->on_wire_size);
1713 GNUNET_STATISTICS_update (plugin->env->stats,
1714 "# UDP, fragmented messages active",
1718 if (GNUNET_OK == result)
1720 GNUNET_STATISTICS_update (plugin->env->stats,
1721 "# UDP, fragmented msgs, messages, sent, success",
1724 GNUNET_STATISTICS_update (plugin->env->stats,
1725 "# UDP, fragmented msgs, bytes payload, sent, success",
1726 s->frag_ctx->payload_size,
1728 GNUNET_STATISTICS_update (plugin->env->stats,
1729 "# UDP, fragmented msgs, bytes overhead, sent, success",
1732 GNUNET_STATISTICS_update (plugin->env->stats,
1733 "# UDP, total, bytes overhead, sent",
1736 GNUNET_STATISTICS_update (plugin->env->stats,
1737 "# UDP, total, bytes payload, sent",
1738 s->frag_ctx->payload_size,
1743 GNUNET_STATISTICS_update (plugin->env->stats,
1744 "# UDP, fragmented msgs, messages, sent, failure",
1747 GNUNET_STATISTICS_update (plugin->env->stats,
1748 "# UDP, fragmented msgs, bytes payload, sent, failure",
1749 s->frag_ctx->payload_size,
1751 GNUNET_STATISTICS_update (plugin->env->stats,
1752 "# UDP, fragmented msgs, bytes payload, sent, failure",
1755 GNUNET_STATISTICS_update (plugin->env->stats,
1756 "# UDP, fragmented msgs, bytes payload, sent, failure",
1761 /* Remove remaining fragments from queue, no need to transmit those
1763 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1765 udpw = plugin->ipv6_queue_head;
1766 while (NULL != udpw)
1769 if ( (udpw->frag_ctx != NULL) &&
1770 (udpw->frag_ctx == frag_ctx) )
1779 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1781 udpw = plugin->ipv4_queue_head;
1782 while (NULL != udpw)
1785 if ( (NULL != udpw->frag_ctx) &&
1786 (udpw->frag_ctx == frag_ctx) )
1795 notify_session_monitor (s->plugin,
1797 GNUNET_TRANSPORT_SS_UPDATE);
1798 GNUNET_FRAGMENT_context_destroy (frag_ctx->frag,
1799 &s->last_expected_msg_delay,
1800 &s->last_expected_ack_delay);
1802 GNUNET_free (frag_ctx);
1807 * We are finished with a fragment in the message queue.
1808 * Notify the continuation and update statistics.
1810 * @param cls the `struct Plugin *`
1811 * @param udpw the queue entry
1812 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1815 qc_fragment_sent (void *cls,
1816 struct UDP_MessageWrapper *udpw,
1819 struct Plugin *plugin = cls;
1821 GNUNET_assert (NULL != udpw->frag_ctx);
1822 if (GNUNET_OK == result)
1824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1825 "Fragment of message with %u bytes transmitted to %s\n",
1826 (unsigned int) udpw->payload_size,
1827 GNUNET_i2s (&udpw->session->target));
1828 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1829 GNUNET_STATISTICS_update (plugin->env->stats,
1830 "# UDP, fragmented msgs, fragments, sent, success",
1833 GNUNET_STATISTICS_update (plugin->env->stats,
1834 "# UDP, fragmented msgs, fragments bytes, sent, success",
1840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1841 "Failed to transmit fragment of message with %u bytes to %s\n",
1842 (unsigned int) udpw->payload_size,
1843 GNUNET_i2s (&udpw->session->target));
1844 fragmented_message_done (udpw->frag_ctx,
1846 GNUNET_STATISTICS_update (plugin->env->stats,
1847 "# UDP, fragmented msgs, fragments, sent, failure",
1850 GNUNET_STATISTICS_update (plugin->env->stats,
1851 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1859 * Function that is called with messages created by the fragmentation
1860 * module. In the case of the `proc` callback of the
1861 * #GNUNET_FRAGMENT_context_create() function, this function must
1862 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1864 * @param cls closure, the `struct UDP_FragmentationContext`
1865 * @param msg the message that was created
1868 enqueue_fragment (void *cls,
1869 const struct GNUNET_MessageHeader *msg)
1871 struct UDP_FragmentationContext *frag_ctx = cls;
1872 struct Plugin *plugin = frag_ctx->plugin;
1873 struct UDP_MessageWrapper *udpw;
1874 struct GNUNET_ATS_Session *session = frag_ctx->session;
1875 size_t msg_len = ntohs (msg->size);
1877 LOG (GNUNET_ERROR_TYPE_DEBUG,
1878 "Enqueuing fragment with %u bytes\n",
1880 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1881 udpw->session = session;
1882 udpw->msg_buf = (char *) &udpw[1];
1883 udpw->msg_size = msg_len;
1884 udpw->payload_size = msg_len; /* FIXME: minus fragment overhead */
1885 udpw->timeout = frag_ctx->timeout;
1886 udpw->start_time = frag_ctx->start_time;
1887 udpw->transmission_time = frag_ctx->next_frag_time;
1888 frag_ctx->next_frag_time
1889 = GNUNET_TIME_absolute_add (frag_ctx->next_frag_time,
1890 frag_ctx->flow_delay_from_other_peer);
1891 udpw->frag_ctx = frag_ctx;
1892 udpw->qc = &qc_fragment_sent;
1893 udpw->qc_cls = plugin;
1894 memcpy (udpw->msg_buf,
1899 if (session->address->address_length == sizeof (struct IPv4UdpAddress))
1900 schedule_select_v4 (plugin);
1902 schedule_select_v6 (plugin);
1907 * We are finished with a message from the message queue.
1908 * Notify the continuation and update statistics.
1910 * @param cls the `struct Plugin *`
1911 * @param udpw the queue entry
1912 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1915 qc_message_sent (void *cls,
1916 struct UDP_MessageWrapper *udpw,
1919 struct Plugin *plugin = cls;
1921 struct GNUNET_TIME_Relative delay;
1923 if (udpw->msg_size >= udpw->payload_size)
1924 overhead = udpw->msg_size - udpw->payload_size;
1926 overhead = udpw->msg_size;
1928 if (NULL != udpw->cont)
1930 delay = GNUNET_TIME_absolute_get_duration (udpw->start_time);
1931 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1933 LOG (GNUNET_ERROR_TYPE_WARNING,
1934 "Message sent via UDP with delay of %s\n",
1935 GNUNET_STRINGS_relative_time_to_string (delay,
1940 LOG (GNUNET_ERROR_TYPE_DEBUG,
1941 "Message sent via UDP with delay of %s\n",
1942 GNUNET_STRINGS_relative_time_to_string (delay,
1945 udpw->cont (udpw->cont_cls,
1946 &udpw->session->target,
1951 if (GNUNET_OK == result)
1953 GNUNET_STATISTICS_update (plugin->env->stats,
1954 "# UDP, unfragmented msgs, messages, sent, success",
1957 GNUNET_STATISTICS_update (plugin->env->stats,
1958 "# UDP, unfragmented msgs, bytes payload, sent, success",
1961 GNUNET_STATISTICS_update (plugin->env->stats,
1962 "# UDP, unfragmented msgs, bytes overhead, sent, success",
1965 GNUNET_STATISTICS_update (plugin->env->stats,
1966 "# UDP, total, bytes overhead, sent",
1969 GNUNET_STATISTICS_update (plugin->env->stats,
1970 "# UDP, total, bytes payload, sent",
1976 GNUNET_STATISTICS_update (plugin->env->stats,
1977 "# UDP, unfragmented msgs, messages, sent, failure",
1980 GNUNET_STATISTICS_update (plugin->env->stats,
1981 "# UDP, unfragmented msgs, bytes payload, sent, failure",
1984 GNUNET_STATISTICS_update (plugin->env->stats,
1985 "# UDP, unfragmented msgs, bytes overhead, sent, failure",
1993 * Function that can be used by the transport service to transmit a
1994 * message using the plugin. Note that in the case of a peer
1995 * disconnecting, the continuation MUST be called prior to the
1996 * disconnect notification itself. This function will be called with
1997 * this peer's HELLO message to initiate a fresh connection to another
2000 * @param cls closure
2001 * @param s which session must be used
2002 * @param msgbuf the message to transmit
2003 * @param msgbuf_size number of bytes in @a msgbuf
2004 * @param priority how important is the message (most plugins will
2005 * ignore message priority and just FIFO)
2006 * @param to how long to wait at most for the transmission (does not
2007 * require plugins to discard the message after the timeout,
2008 * just advisory for the desired delay; most plugins will ignore
2010 * @param cont continuation to call once the message has
2011 * been transmitted (or if the transport is ready
2012 * for the next transmission call; or if the
2013 * peer disconnected...); can be NULL
2014 * @param cont_cls closure for @a cont
2015 * @return number of bytes used (on the physical network, with overheads);
2016 * -1 on hard errors (i.e. address invalid); 0 is a legal value
2017 * and does NOT mean that the message was not transmitted (DV)
2020 udp_plugin_send (void *cls,
2021 struct GNUNET_ATS_Session *s,
2024 unsigned int priority,
2025 struct GNUNET_TIME_Relative to,
2026 GNUNET_TRANSPORT_TransmitContinuation cont,
2029 struct Plugin *plugin = cls;
2030 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2031 struct UDP_FragmentationContext *frag_ctx;
2032 struct UDP_MessageWrapper *udpw;
2033 struct UDPMessage *udp;
2034 char mbuf[udpmlen] GNUNET_ALIGN;
2035 struct GNUNET_TIME_Relative latency;
2037 if ( (sizeof(struct IPv6UdpAddress) == s->address->address_length) &&
2038 (NULL == plugin->sockv6) )
2039 return GNUNET_SYSERR;
2040 if ( (sizeof(struct IPv4UdpAddress) == s->address->address_length) &&
2041 (NULL == plugin->sockv4) )
2042 return GNUNET_SYSERR;
2043 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2046 return GNUNET_SYSERR;
2049 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2054 return GNUNET_SYSERR;
2056 LOG (GNUNET_ERROR_TYPE_DEBUG,
2057 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2059 GNUNET_i2s (&s->target),
2060 udp_address_to_string (plugin,
2061 s->address->address,
2062 s->address->address_length));
2064 udp = (struct UDPMessage *) mbuf;
2065 udp->header.size = htons (udpmlen);
2066 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2067 udp->reserved = htonl (0);
2068 udp->sender = *plugin->env->my_identity;
2070 /* We do not update the session time out here! Otherwise this
2071 * session will not timeout since we send keep alive before session
2074 * For UDP we update session timeout only on receive, this will
2075 * cover keep alives, since remote peer will reply with keep alive
2078 if (udpmlen <= UDP_MTU)
2080 /* unfragmented message */
2081 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2083 udpw->msg_buf = (char *) &udpw[1];
2084 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2085 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2086 udpw->start_time = GNUNET_TIME_absolute_get ();
2087 udpw->timeout = GNUNET_TIME_relative_to_absolute (to);
2088 udpw->transmission_time = s->last_transmit_time;
2089 s->last_transmit_time
2090 = GNUNET_TIME_absolute_add (s->last_transmit_time,
2091 s->flow_delay_from_other_peer);
2093 udpw->cont_cls = cont_cls;
2094 udpw->frag_ctx = NULL;
2095 udpw->qc = &qc_message_sent;
2096 udpw->qc_cls = plugin;
2097 memcpy (udpw->msg_buf,
2099 sizeof (struct UDPMessage));
2100 memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)],
2105 GNUNET_STATISTICS_update (plugin->env->stats,
2106 "# UDP, unfragmented messages queued total",
2109 GNUNET_STATISTICS_update (plugin->env->stats,
2110 "# UDP, unfragmented bytes payload queued total",
2113 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2114 schedule_select_v4 (plugin);
2116 schedule_select_v6 (plugin);
2120 /* fragmented message */
2121 if (NULL != s->frag_ctx)
2122 return GNUNET_SYSERR;
2126 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2127 frag_ctx->plugin = plugin;
2128 frag_ctx->session = s;
2129 frag_ctx->cont = cont;
2130 frag_ctx->cont_cls = cont_cls;
2131 frag_ctx->start_time = GNUNET_TIME_absolute_get ();
2132 frag_ctx->next_frag_time = s->last_transmit_time;
2133 frag_ctx->flow_delay_from_other_peer
2134 = GNUNET_TIME_relative_divide (s->flow_delay_from_other_peer,
2137 frag_ctx->timeout = GNUNET_TIME_relative_to_absolute (to);
2138 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2139 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2140 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2143 s->last_expected_msg_delay,
2144 s->last_expected_ack_delay,
2148 s->frag_ctx = frag_ctx;
2149 s->last_transmit_time = frag_ctx->next_frag_time;
2150 latency = GNUNET_TIME_absolute_get_remaining (s->last_transmit_time);
2151 if (latency.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2152 LOG (GNUNET_ERROR_TYPE_WARNING,
2153 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2154 GNUNET_STRINGS_relative_time_to_string (latency,
2156 GNUNET_i2s (&s->target),
2157 (unsigned int) s->msgs_in_queue);
2159 LOG (GNUNET_ERROR_TYPE_DEBUG,
2160 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2161 GNUNET_STRINGS_relative_time_to_string (latency,
2163 GNUNET_i2s (&s->target),
2164 (unsigned int) s->msgs_in_queue);
2166 GNUNET_STATISTICS_update (plugin->env->stats,
2167 "# UDP, fragmented messages active",
2170 GNUNET_STATISTICS_update (plugin->env->stats,
2171 "# UDP, fragmented messages, total",
2174 GNUNET_STATISTICS_update (plugin->env->stats,
2175 "# UDP, fragmented bytes (payload)",
2176 frag_ctx->payload_size,
2179 notify_session_monitor (s->plugin,
2181 GNUNET_TRANSPORT_SS_UPDATE);
2186 /* ********************** Receiving ********************** */
2190 * Closure for #find_receive_context().
2192 struct FindReceiveContext
2195 * Where to store the result.
2197 struct DefragContext *rc;
2200 * Session associated with this context.
2202 struct GNUNET_ATS_Session *session;
2207 const union UdpAddress *udp_addr;
2210 * Number of bytes in @e udp_addr.
2212 size_t udp_addr_len;
2218 * Scan the heap for a receive context with the given address.
2220 * @param cls the `struct FindReceiveContext`
2221 * @param node internal node of the heap
2222 * @param element value stored at the node (a `struct ReceiveContext`)
2223 * @param cost cost associated with the node
2224 * @return #GNUNET_YES if we should continue to iterate,
2225 * #GNUNET_NO if not.
2228 find_receive_context (void *cls,
2229 struct GNUNET_CONTAINER_HeapNode *node,
2231 GNUNET_CONTAINER_HeapCostType cost)
2233 struct FindReceiveContext *frc = cls;
2234 struct DefragContext *e = element;
2236 if ( (frc->udp_addr_len == e->udp_addr_len) &&
2237 (0 == memcmp (frc->udp_addr,
2239 frc->udp_addr_len)) )
2249 * Functions with this signature are called whenever we need to close
2250 * a session due to a disconnect or failure to establish a connection.
2252 * @param cls closure with the `struct Plugin`
2253 * @param s session to close down
2254 * @return #GNUNET_OK on success
2257 udp_disconnect_session (void *cls,
2258 struct GNUNET_ATS_Session *s)
2260 struct Plugin *plugin = cls;
2261 struct UDP_MessageWrapper *udpw;
2262 struct UDP_MessageWrapper *next;
2263 struct FindReceiveContext frc;
2265 GNUNET_assert (GNUNET_YES != s->in_destroy);
2266 LOG (GNUNET_ERROR_TYPE_DEBUG,
2267 "Session %p to peer `%s' at address %s ended\n",
2269 GNUNET_i2s (&s->target),
2270 udp_address_to_string (plugin,
2271 s->address->address,
2272 s->address->address_length));
2273 if (NULL != s->timeout_task)
2275 GNUNET_SCHEDULER_cancel (s->timeout_task);
2276 s->timeout_task = NULL;
2278 if (NULL != s->frag_ctx)
2280 /* Remove fragmented message due to disconnect */
2281 fragmented_message_done (s->frag_ctx,
2284 GNUNET_assert (GNUNET_YES ==
2285 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
2289 frc.udp_addr = s->address->address;
2290 frc.udp_addr_len = s->address->address_length;
2291 /* Lookup existing receive context for this address */
2292 if (NULL != plugin->defrag_ctxs)
2294 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2295 &find_receive_context,
2299 struct DefragContext *d_ctx = frc.rc;
2301 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
2302 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2303 GNUNET_free (d_ctx);
2306 s->in_destroy = GNUNET_YES;
2307 next = plugin->ipv4_queue_head;
2308 while (NULL != (udpw = next))
2311 if (udpw->session == s)
2315 udpw->qc (udpw->qc_cls,
2321 next = plugin->ipv6_queue_head;
2322 while (NULL != (udpw = next))
2325 if (udpw->session == s)
2329 udpw->qc (udpw->qc_cls,
2335 if ( (NULL != s->frag_ctx) &&
2336 (NULL != s->frag_ctx->cont) )
2338 /* The 'frag_ctx' itself will be freed in #free_session() a bit
2339 later, as it might be in use right now */
2340 LOG (GNUNET_ERROR_TYPE_DEBUG,
2341 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
2342 GNUNET_i2s (&s->target));
2343 s->frag_ctx->cont (s->frag_ctx->cont_cls,
2346 s->frag_ctx->payload_size,
2347 s->frag_ctx->on_wire_size);
2349 notify_session_monitor (s->plugin,
2351 GNUNET_TRANSPORT_SS_DONE);
2352 plugin->env->session_end (plugin->env->cls,
2355 GNUNET_STATISTICS_set (plugin->env->stats,
2356 "# UDP sessions active",
2357 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2366 * Handle a #GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK message.
2368 * @param plugin the UDP plugin
2369 * @param msg the (presumed) UDP ACK message
2370 * @param udp_addr sender address
2371 * @param udp_addr_len number of bytes in @a udp_addr
2374 read_process_ack (struct Plugin *plugin,
2375 const struct GNUNET_MessageHeader *msg,
2376 const union UdpAddress *udp_addr,
2377 socklen_t udp_addr_len)
2379 const struct GNUNET_MessageHeader *ack;
2380 const struct UDP_ACK_Message *udp_ack;
2381 struct GNUNET_HELLO_Address *address;
2382 struct GNUNET_ATS_Session *s;
2383 struct GNUNET_TIME_Relative flow_delay;
2385 /* check message format */
2386 if (ntohs (msg->size)
2387 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2389 GNUNET_break_op (0);
2392 udp_ack = (const struct UDP_ACK_Message *) msg;
2393 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2394 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2400 /* Locate session */
2401 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2405 GNUNET_HELLO_ADDRESS_INFO_NONE);
2406 s = udp_plugin_lookup_session (plugin,
2410 LOG (GNUNET_ERROR_TYPE_WARNING,
2411 "UDP session of address %s for ACK not found\n",
2412 udp_address_to_string (plugin,
2414 address->address_length));
2415 GNUNET_HELLO_address_free (address);
2418 if (NULL == s->frag_ctx)
2420 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2421 "Fragmentation context of address %s for ACK (%s) not found\n",
2422 udp_address_to_string (plugin,
2424 address->address_length),
2425 GNUNET_FRAGMENT_print_ack (ack));
2426 GNUNET_HELLO_address_free (address);
2429 GNUNET_HELLO_address_free (address);
2431 /* evaluate flow delay: how long should we wait between messages? */
2432 if (UINT32_MAX == ntohl (udp_ack->delay))
2434 /* Other peer asked for us to terminate the session */
2435 LOG (GNUNET_ERROR_TYPE_INFO,
2436 "Asked to disconnect UDP session of %s\n",
2437 GNUNET_i2s (&udp_ack->sender));
2438 udp_disconnect_session (plugin,
2442 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2443 if (flow_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2444 LOG (GNUNET_ERROR_TYPE_WARNING,
2445 "We received a sending delay of %s for %s\n",
2446 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2448 GNUNET_i2s (&udp_ack->sender));
2450 LOG (GNUNET_ERROR_TYPE_DEBUG,
2451 "We received a sending delay of %s for %s\n",
2452 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2454 GNUNET_i2s (&udp_ack->sender));
2455 /* Flow delay is for the reassembled packet, however, our delay
2456 is per packet, so we need to adjust: */
2457 s->flow_delay_from_other_peer = flow_delay;
2461 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2464 LOG (GNUNET_ERROR_TYPE_DEBUG,
2465 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2466 (unsigned int) ntohs (msg->size),
2467 GNUNET_i2s (&udp_ack->sender),
2468 udp_address_to_string (plugin,
2471 /* Expect more ACKs to arrive */
2475 /* Remove fragmented message after successful sending */
2476 LOG (GNUNET_ERROR_TYPE_DEBUG,
2477 "Message from %s at %s full ACK'ed\n",
2478 GNUNET_i2s (&udp_ack->sender),
2479 udp_address_to_string (plugin,
2482 fragmented_message_done (s->frag_ctx,
2488 * Message tokenizer has broken up an incomming message. Pass it on
2491 * @param cls the `struct Plugin *`
2492 * @param client the `struct GNUNET_ATS_Session *`
2493 * @param hdr the actual message
2494 * @return #GNUNET_OK (always)
2497 process_inbound_tokenized_messages (void *cls,
2499 const struct GNUNET_MessageHeader *hdr)
2501 struct Plugin *plugin = cls;
2502 struct GNUNET_ATS_Session *session = client;
2504 if (GNUNET_YES == session->in_destroy)
2506 reschedule_session_timeout (session);
2507 session->flow_delay_for_other_peer
2508 = plugin->env->receive (plugin->env->cls,
2517 * Destroy a session, plugin is being unloaded.
2519 * @param cls the `struct Plugin`
2520 * @param key hash of public key of target peer
2521 * @param value a `struct PeerSession *` to clean up
2522 * @return #GNUNET_OK (continue to iterate)
2525 disconnect_and_free_it (void *cls,
2526 const struct GNUNET_PeerIdentity *key,
2529 struct Plugin *plugin = cls;
2531 udp_disconnect_session (plugin,
2538 * Disconnect from a remote node. Clean up session if we have one for
2541 * @param cls closure for this call (should be handle to Plugin)
2542 * @param target the peeridentity of the peer to disconnect
2543 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
2546 udp_disconnect (void *cls,
2547 const struct GNUNET_PeerIdentity *target)
2549 struct Plugin *plugin = cls;
2551 LOG (GNUNET_ERROR_TYPE_DEBUG,
2552 "Disconnecting from peer `%s'\n",
2553 GNUNET_i2s (target));
2554 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
2556 &disconnect_and_free_it,
2562 * Session was idle, so disconnect it.
2564 * @param cls the `struct GNUNET_ATS_Session` to time out
2567 session_timeout (void *cls)
2569 struct GNUNET_ATS_Session *s = cls;
2570 struct Plugin *plugin = s->plugin;
2571 struct GNUNET_TIME_Relative left;
2573 s->timeout_task = NULL;
2574 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
2575 if (left.rel_value_us > 0)
2577 /* not actually our turn yet, but let's at least update
2578 the monitor, it may think we're about to die ... */
2579 notify_session_monitor (s->plugin,
2581 GNUNET_TRANSPORT_SS_UPDATE);
2582 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
2587 LOG (GNUNET_ERROR_TYPE_DEBUG,
2588 "Session %p was idle for %s, disconnecting\n",
2590 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
2592 /* call session destroy function */
2593 udp_disconnect_session (plugin,
2599 * Allocate a new session for the given endpoint address.
2600 * Note that this function does not inform the service
2601 * of the new session, this is the responsibility of the
2602 * caller (if needed).
2604 * @param cls the `struct Plugin`
2605 * @param address address of the other peer to use
2606 * @param network_type network type the address belongs to
2607 * @return NULL on error, otherwise session handle
2609 static struct GNUNET_ATS_Session *
2610 udp_plugin_create_session (void *cls,
2611 const struct GNUNET_HELLO_Address *address,
2612 enum GNUNET_ATS_Network_Type network_type)
2614 struct Plugin *plugin = cls;
2615 struct GNUNET_ATS_Session *s;
2617 s = GNUNET_new (struct GNUNET_ATS_Session);
2619 s->address = GNUNET_HELLO_address_copy (address);
2620 s->target = address->peer;
2621 s->last_transmit_time = GNUNET_TIME_absolute_get ();
2622 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2624 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
2625 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
2626 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
2627 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
2628 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
2631 s->scope = network_type;
2633 LOG (GNUNET_ERROR_TYPE_DEBUG,
2634 "Creating new session %p for peer `%s' address `%s'\n",
2636 GNUNET_i2s (&address->peer),
2637 udp_address_to_string (plugin,
2639 address->address_length));
2640 GNUNET_assert (GNUNET_OK ==
2641 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
2644 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
2645 GNUNET_STATISTICS_set (plugin->env->stats,
2646 "# UDP sessions active",
2647 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2649 notify_session_monitor (plugin,
2651 GNUNET_TRANSPORT_SS_INIT);
2657 * Creates a new outbound session the transport service will use to
2658 * send data to the peer.
2660 * @param cls the `struct Plugin *`
2661 * @param address the address
2662 * @return the session or NULL of max connections exceeded
2664 static struct GNUNET_ATS_Session *
2665 udp_plugin_get_session (void *cls,
2666 const struct GNUNET_HELLO_Address *address)
2668 struct Plugin *plugin = cls;
2669 struct GNUNET_ATS_Session *s;
2670 enum GNUNET_ATS_Network_Type network_type = GNUNET_ATS_NET_UNSPECIFIED;
2671 const struct IPv4UdpAddress *udp_v4;
2672 const struct IPv6UdpAddress *udp_v6;
2674 if (NULL == address)
2679 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
2680 (address->address_length != sizeof(struct IPv6UdpAddress)) )
2682 GNUNET_break_op (0);
2685 if (NULL != (s = udp_plugin_lookup_session (cls,
2689 /* need to create new session */
2690 if (sizeof (struct IPv4UdpAddress) == address->address_length)
2692 struct sockaddr_in v4;
2694 udp_v4 = (const struct IPv4UdpAddress *) address->address;
2695 memset (&v4, '\0', sizeof (v4));
2696 v4.sin_family = AF_INET;
2697 #if HAVE_SOCKADDR_IN_SIN_LEN
2698 v4.sin_len = sizeof (struct sockaddr_in);
2700 v4.sin_port = udp_v4->u4_port;
2701 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
2702 network_type = plugin->env->get_address_type (plugin->env->cls,
2703 (const struct sockaddr *) &v4,
2706 if (sizeof (struct IPv6UdpAddress) == address->address_length)
2708 struct sockaddr_in6 v6;
2710 udp_v6 = (const struct IPv6UdpAddress *) address->address;
2711 memset (&v6, '\0', sizeof (v6));
2712 v6.sin6_family = AF_INET6;
2713 #if HAVE_SOCKADDR_IN_SIN_LEN
2714 v6.sin6_len = sizeof (struct sockaddr_in6);
2716 v6.sin6_port = udp_v6->u6_port;
2717 v6.sin6_addr = udp_v6->ipv6_addr;
2718 network_type = plugin->env->get_address_type (plugin->env->cls,
2719 (const struct sockaddr *) &v6,
2722 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2723 return udp_plugin_create_session (cls,
2730 * We've received a UDP Message. Process it (pass contents to main service).
2732 * @param plugin plugin context
2733 * @param msg the message
2734 * @param udp_addr sender address
2735 * @param udp_addr_len number of bytes in @a udp_addr
2736 * @param network_type network type the address belongs to
2739 process_udp_message (struct Plugin *plugin,
2740 const struct UDPMessage *msg,
2741 const union UdpAddress *udp_addr,
2742 size_t udp_addr_len,
2743 enum GNUNET_ATS_Network_Type network_type)
2745 struct GNUNET_ATS_Session *s;
2746 struct GNUNET_HELLO_Address *address;
2748 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2749 if (0 != ntohl (msg->reserved))
2754 if (ntohs (msg->header.size)
2755 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2761 address = GNUNET_HELLO_address_allocate (&msg->sender,
2765 GNUNET_HELLO_ADDRESS_INFO_NONE);
2767 (s = udp_plugin_lookup_session (plugin,
2770 s = udp_plugin_create_session (plugin,
2773 plugin->env->session_start (plugin->env->cls,
2777 notify_session_monitor (plugin,
2779 GNUNET_TRANSPORT_SS_UP);
2781 GNUNET_free (address);
2784 GNUNET_SERVER_mst_receive (plugin->mst,
2786 (const char *) &msg[1],
2787 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2791 if ( (0 == s->rc) &&
2792 (GNUNET_YES == s->in_destroy) )
2798 * Process a defragmented message.
2800 * @param cls the `struct DefragContext *`
2801 * @param msg the message
2804 fragment_msg_proc (void *cls,
2805 const struct GNUNET_MessageHeader *msg)
2807 struct DefragContext *dc = cls;
2808 const struct UDPMessage *um;
2810 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2812 GNUNET_break_op (0);
2815 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2817 GNUNET_break_op (0);
2820 um = (const struct UDPMessage *) msg;
2821 dc->sender = um->sender;
2822 dc->have_sender = GNUNET_YES;
2823 process_udp_message (dc->plugin,
2832 * We finished sending an acknowledgement. Update
2835 * @param cls the `struct Plugin`
2836 * @param udpw message queue entry of the ACK
2837 * @param result #GNUNET_OK if the transmission worked,
2838 * #GNUNET_SYSERR if we failed to send the ACK
2841 ack_message_sent (void *cls,
2842 struct UDP_MessageWrapper *udpw,
2845 struct Plugin *plugin = cls;
2847 if (GNUNET_OK == result)
2849 GNUNET_STATISTICS_update (plugin->env->stats,
2850 "# UDP, ACK messages sent",
2856 GNUNET_STATISTICS_update (plugin->env->stats,
2857 "# UDP, ACK transmissions failed",
2865 * Transmit an acknowledgement.
2867 * @param cls the `struct DefragContext *`
2868 * @param id message ID (unused)
2869 * @param msg ack to transmit
2872 ack_proc (void *cls,
2874 const struct GNUNET_MessageHeader *msg)
2876 struct DefragContext *rc = cls;
2877 struct Plugin *plugin = rc->plugin;
2878 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2879 struct UDP_ACK_Message *udp_ack;
2881 struct UDP_MessageWrapper *udpw;
2882 struct GNUNET_ATS_Session *s;
2883 struct GNUNET_HELLO_Address *address;
2885 if (GNUNET_NO == rc->have_sender)
2887 /* tried to defragment but never succeeded, hence will not ACK */
2888 /* This can happen if we just lost msgs */
2889 GNUNET_STATISTICS_update (plugin->env->stats,
2890 "# UDP, fragments discarded without ACK",
2895 address = GNUNET_HELLO_address_allocate (&rc->sender,
2899 GNUNET_HELLO_ADDRESS_INFO_NONE);
2900 s = udp_plugin_lookup_session (plugin,
2902 GNUNET_HELLO_address_free (address);
2905 LOG (GNUNET_ERROR_TYPE_ERROR,
2906 "Trying to transmit ACK to peer `%s' but no session found!\n",
2907 udp_address_to_string (plugin,
2910 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2911 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2913 GNUNET_STATISTICS_update (plugin->env->stats,
2914 "# UDP, ACK transmissions failed",
2919 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
2920 s->flow_delay_for_other_peer.rel_value_us)
2922 else if (s->flow_delay_for_other_peer.rel_value_us < UINT32_MAX)
2923 delay = s->flow_delay_for_other_peer.rel_value_us;
2925 delay = UINT32_MAX - 1; /* largest value we can communicate */
2926 LOG (GNUNET_ERROR_TYPE_DEBUG,
2927 "Sending ACK to `%s' including delay of %s\n",
2928 udp_address_to_string (plugin,
2931 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2933 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2934 udpw->msg_size = msize;
2935 udpw->payload_size = 0;
2937 udpw->start_time = GNUNET_TIME_absolute_get ();
2938 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2939 udpw->msg_buf = (char *) &udpw[1];
2940 udpw->qc = &ack_message_sent;
2941 udpw->qc_cls = plugin;
2942 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2943 udp_ack->header.size = htons ((uint16_t) msize);
2944 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2945 udp_ack->delay = htonl (delay);
2946 udp_ack->sender = *plugin->env->my_identity;
2947 memcpy (&udp_ack[1],
2952 notify_session_monitor (plugin,
2954 GNUNET_TRANSPORT_SS_UPDATE);
2955 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2956 schedule_select_v4 (plugin);
2958 schedule_select_v6 (plugin);
2963 * We received a fragment, process it.
2965 * @param plugin our plugin
2966 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2967 * @param udp_addr sender address
2968 * @param udp_addr_len number of bytes in @a udp_addr
2969 * @param network_type network type the address belongs to
2972 read_process_fragment (struct Plugin *plugin,
2973 const struct GNUNET_MessageHeader *msg,
2974 const union UdpAddress *udp_addr,
2975 size_t udp_addr_len,
2976 enum GNUNET_ATS_Network_Type network_type)
2978 struct DefragContext *d_ctx;
2979 struct GNUNET_TIME_Absolute now;
2980 struct FindReceiveContext frc;
2983 frc.udp_addr = udp_addr;
2984 frc.udp_addr_len = udp_addr_len;
2986 /* Lookup existing receive context for this address */
2987 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2988 &find_receive_context,
2990 now = GNUNET_TIME_absolute_get ();
2995 /* Create a new defragmentation context */
2996 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
3000 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
3001 d_ctx->udp_addr_len = udp_addr_len;
3002 d_ctx->network_type = network_type;
3003 d_ctx->plugin = plugin;
3004 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
3006 UDP_MAX_MESSAGES_IN_DEFRAG,
3010 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
3012 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3013 LOG (GNUNET_ERROR_TYPE_DEBUG,
3014 "Created new defragmentation context for %u-byte fragment from `%s'\n",
3015 (unsigned int) ntohs (msg->size),
3016 udp_address_to_string (plugin,
3022 LOG (GNUNET_ERROR_TYPE_DEBUG,
3023 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
3024 (unsigned int) ntohs (msg->size),
3025 udp_address_to_string (plugin,
3031 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag,
3034 /* keep this 'rc' from expiring */
3035 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs,
3037 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3039 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
3040 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
3042 /* remove 'rc' that was inactive the longest */
3043 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
3044 GNUNET_assert (NULL != d_ctx);
3045 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3046 GNUNET_free (d_ctx);
3047 GNUNET_STATISTICS_update (plugin->env->stats,
3048 "# UDP, Defragmentations aborted",
3056 * Read and process a message from the given socket.
3058 * @param plugin the overall plugin
3059 * @param rsock socket to read from
3062 udp_select_read (struct Plugin *plugin,
3063 struct GNUNET_NETWORK_Handle *rsock)
3066 struct sockaddr_storage addr;
3067 char buf[65536] GNUNET_ALIGN;
3069 const struct GNUNET_MessageHeader *msg;
3070 struct IPv4UdpAddress v4;
3071 struct IPv6UdpAddress v6;
3072 const struct sockaddr *sa;
3073 const struct sockaddr_in *sa4;
3074 const struct sockaddr_in6 *sa6;
3075 const union UdpAddress *int_addr;
3076 size_t int_addr_len;
3077 enum GNUNET_ATS_Network_Type network_type;
3079 fromlen = sizeof (addr);
3083 size = GNUNET_NETWORK_socket_recvfrom (rsock,
3086 (struct sockaddr *) &addr,
3088 sa = (const struct sockaddr *) &addr;
3090 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
3091 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
3092 * on this socket has failed.
3094 * WSAECONNRESET - The virtual circuit was reset by the remote side
3095 * executing a hard or abortive close. The application should close
3096 * the socket; it is no longer usable. On a UDP-datagram socket this
3097 * error indicates a previous send operation resulted in an ICMP Port
3098 * Unreachable message.
3100 if ( (-1 == size) &&
3101 (ECONNRESET == errno) )
3106 LOG (GNUNET_ERROR_TYPE_DEBUG,
3107 "UDP failed to receive data: %s\n",
3109 /* Connection failure or something. Not a protocol violation. */
3113 /* Check if this is a STUN packet */
3114 if (GNUNET_NAT_is_valid_stun_packet (plugin->nat,
3117 return; /* was STUN, do not process further */
3119 if (size < sizeof(struct GNUNET_MessageHeader))
3121 LOG (GNUNET_ERROR_TYPE_WARNING,
3122 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
3123 (unsigned int ) size,
3126 /* _MAY_ be a connection failure (got partial message) */
3127 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
3128 GNUNET_break_op (0);
3132 msg = (const struct GNUNET_MessageHeader *) buf;
3133 LOG (GNUNET_ERROR_TYPE_DEBUG,
3134 "UDP received %u-byte message from `%s' type %u\n",
3135 (unsigned int) size,
3139 if (size != ntohs (msg->size))
3141 LOG (GNUNET_ERROR_TYPE_WARNING,
3142 "UDP malformed message (size %u) header from %s\n",
3143 (unsigned int) size,
3146 GNUNET_break_op (0);
3149 GNUNET_STATISTICS_update (plugin->env->stats,
3150 "# UDP, total bytes received",
3153 network_type = plugin->env->get_address_type (plugin->env->cls,
3156 switch (sa->sa_family)
3159 sa4 = (const struct sockaddr_in *) &addr;
3161 v4.ipv4_addr = sa4->sin_addr.s_addr;
3162 v4.u4_port = sa4->sin_port;
3163 int_addr = (union UdpAddress *) &v4;
3164 int_addr_len = sizeof (v4);
3167 sa6 = (const struct sockaddr_in6 *) &addr;
3169 v6.ipv6_addr = sa6->sin6_addr;
3170 v6.u6_port = sa6->sin6_port;
3171 int_addr = (union UdpAddress *) &v6;
3172 int_addr_len = sizeof (v6);
3179 switch (ntohs (msg->type))
3181 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
3182 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
3183 udp_broadcast_receive (plugin,
3190 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
3191 if (ntohs (msg->size) < sizeof(struct UDPMessage))
3196 process_udp_message (plugin,
3197 (const struct UDPMessage *) msg,
3202 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
3203 read_process_ack (plugin,
3208 case GNUNET_MESSAGE_TYPE_FRAGMENT:
3209 read_process_fragment (plugin,
3223 * Removes messages from the transmission queue that have
3224 * timed out, and then selects a message that should be
3227 * @param plugin the UDP plugin
3228 * @param sock which socket should we process the queue for (v4 or v6)
3229 * @return message selected for transmission, or NULL for none
3231 static struct UDP_MessageWrapper *
3232 remove_timeout_messages_and_select (struct Plugin *plugin,
3233 struct GNUNET_NETWORK_Handle *sock)
3235 struct UDP_MessageWrapper *udpw;
3236 struct GNUNET_TIME_Relative remaining;
3237 struct GNUNET_ATS_Session *session;
3240 removed = GNUNET_NO;
3241 udpw = (sock == plugin->sockv4)
3242 ? plugin->ipv4_queue_head
3243 : plugin->ipv6_queue_head;
3244 while (NULL != udpw)
3246 session = udpw->session;
3247 /* Find messages with timeout */
3248 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
3249 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
3251 /* Message timed out */
3252 removed = GNUNET_YES;
3255 udpw->qc (udpw->qc_cls,
3260 if (sock == plugin->sockv4)
3262 udpw = plugin->ipv4_queue_head;
3264 else if (sock == plugin->sockv6)
3266 udpw = plugin->ipv6_queue_head;
3270 GNUNET_break (0); /* should never happen */
3273 GNUNET_STATISTICS_update (plugin->env->stats,
3274 "# messages discarded due to timeout",
3280 /* Message did not time out, check transmission time */
3281 remaining = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
3282 if (0 == remaining.rel_value_us)
3284 /* this message is not delayed */
3285 LOG (GNUNET_ERROR_TYPE_DEBUG,
3286 "Message for peer `%s' (%u bytes) is not delayed \n",
3287 GNUNET_i2s (&udpw->session->target),
3288 udpw->payload_size);
3289 break; /* Found message to send, break */
3293 /* Message is delayed, try next */
3294 LOG (GNUNET_ERROR_TYPE_DEBUG,
3295 "Message for peer `%s' (%u bytes) is delayed for %s\n",
3296 GNUNET_i2s (&udpw->session->target),
3298 GNUNET_STRINGS_relative_time_to_string (remaining,
3304 if (GNUNET_YES == removed)
3305 notify_session_monitor (session->plugin,
3307 GNUNET_TRANSPORT_SS_UPDATE);
3313 * We failed to transmit a message via UDP. Generate
3314 * a descriptive error message.
3316 * @param plugin our plugin
3317 * @param sa target address we were trying to reach
3318 * @param slen number of bytes in @a sa
3319 * @param error the errno value returned from the sendto() call
3322 analyze_send_error (struct Plugin *plugin,
3323 const struct sockaddr *sa,
3327 enum GNUNET_ATS_Network_Type type;
3329 type = plugin->env->get_address_type (plugin->env->cls,
3332 if ( ( (GNUNET_ATS_NET_LAN == type) ||
3333 (GNUNET_ATS_NET_WAN == type) ) &&
3334 ( (ENETUNREACH == errno) ||
3335 (ENETDOWN == errno) ) )
3337 if (slen == sizeof (struct sockaddr_in))
3339 /* IPv4: "Network unreachable" or "Network down"
3341 * This indicates we do not have connectivity
3343 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3344 _("UDP could not transmit message to `%s': "
3345 "Network seems down, please check your network configuration\n"),
3349 if (slen == sizeof (struct sockaddr_in6))
3351 /* IPv6: "Network unreachable" or "Network down"
3353 * This indicates that this system is IPv6 enabled, but does not
3354 * have a valid global IPv6 address assigned or we do not have
3357 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3358 _("UDP could not transmit IPv6 message! "
3359 "Please check your network configuration and disable IPv6 if your "
3360 "connection does not have a global IPv6 address\n"));
3365 LOG (GNUNET_ERROR_TYPE_WARNING,
3366 "UDP could not transmit message to `%s': `%s'\n",
3375 * It is time to try to transmit a UDP message. Select one
3378 * @param plugin the plugin
3379 * @param sock which socket (v4/v6) to send on
3382 udp_select_send (struct Plugin *plugin,
3383 struct GNUNET_NETWORK_Handle *sock)
3387 const struct sockaddr *a;
3388 const struct IPv4UdpAddress *u4;
3389 struct sockaddr_in a4;
3390 const struct IPv6UdpAddress *u6;
3391 struct sockaddr_in6 a6;
3392 struct UDP_MessageWrapper *udpw;
3394 /* Find message(s) to send */
3395 while (NULL != (udpw = remove_timeout_messages_and_select (plugin,
3398 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
3400 u4 = udpw->session->address->address;
3404 a4.sin_family = AF_INET;
3405 #if HAVE_SOCKADDR_IN_SIN_LEN
3406 a4.sin_len = sizeof (a4);
3408 a4.sin_port = u4->u4_port;
3409 a4.sin_addr.s_addr = u4->ipv4_addr;
3410 a = (const struct sockaddr *) &a4;
3413 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
3415 u6 = udpw->session->address->address;
3419 a6.sin6_family = AF_INET6;
3420 #if HAVE_SOCKADDR_IN_SIN_LEN
3421 a6.sin6_len = sizeof (a6);
3423 a6.sin6_port = u6->u6_port;
3424 a6.sin6_addr = u6->ipv6_addr;
3425 a = (const struct sockaddr *) &a6;
3433 udpw->qc (udpw->qc_cls,
3436 notify_session_monitor (plugin,
3438 GNUNET_TRANSPORT_SS_UPDATE);
3442 sent = GNUNET_NETWORK_socket_sendto (sock,
3447 udpw->session->last_transmit_time
3448 = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
3449 udpw->session->last_transmit_time);
3452 if (GNUNET_SYSERR == sent)
3455 analyze_send_error (plugin,
3459 udpw->qc (udpw->qc_cls,
3462 GNUNET_STATISTICS_update (plugin->env->stats,
3463 "# UDP, total, bytes, sent, failure",
3466 GNUNET_STATISTICS_update (plugin->env->stats,
3467 "# UDP, total, messages, sent, failure",
3474 LOG (GNUNET_ERROR_TYPE_DEBUG,
3475 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3476 (unsigned int) (udpw->msg_size),
3477 GNUNET_i2s (&udpw->session->target),
3481 (sent < 0) ? STRERROR (errno) : "ok");
3482 GNUNET_STATISTICS_update (plugin->env->stats,
3483 "# UDP, total, bytes, sent, success",
3486 GNUNET_STATISTICS_update (plugin->env->stats,
3487 "# UDP, total, messages, sent, success",
3490 if (NULL != udpw->frag_ctx)
3491 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3492 udpw->qc (udpw->qc_cls,
3496 notify_session_monitor (plugin,
3498 GNUNET_TRANSPORT_SS_UPDATE);
3504 /* ***************** Event loop (part 2) *************** */
3508 * We have been notified that our readset has something to read. We don't
3509 * know which socket needs to be read, so we have to check each one
3510 * Then reschedule this function to be called again once more is available.
3512 * @param cls the plugin handle
3515 udp_plugin_select_v4 (void *cls)
3517 struct Plugin *plugin = cls;
3518 const struct GNUNET_SCHEDULER_TaskContext *tc;
3520 plugin->select_task_v4 = NULL;
3521 if (NULL == plugin->sockv4)
3523 tc = GNUNET_SCHEDULER_get_task_context ();
3524 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3525 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3527 udp_select_read (plugin,
3529 udp_select_send (plugin,
3531 schedule_select_v4 (plugin);
3536 * We have been notified that our readset has something to read. We don't
3537 * know which socket needs to be read, so we have to check each one
3538 * Then reschedule this function to be called again once more is available.
3540 * @param cls the plugin handle
3543 udp_plugin_select_v6 (void *cls)
3545 struct Plugin *plugin = cls;
3546 const struct GNUNET_SCHEDULER_TaskContext *tc;
3548 plugin->select_task_v6 = NULL;
3549 if (NULL == plugin->sockv6)
3551 tc = GNUNET_SCHEDULER_get_task_context ();
3552 if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3553 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3555 udp_select_read (plugin,
3558 udp_select_send (plugin,
3560 schedule_select_v6 (plugin);
3564 /* ******************* Initialization *************** */
3568 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3570 * @param plugin the plugin to initialize
3571 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3572 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3573 * @return number of sockets that were successfully bound
3576 setup_sockets (struct Plugin *plugin,
3577 const struct sockaddr_in6 *bind_v6,
3578 const struct sockaddr_in *bind_v4)
3581 int sockets_created = 0;
3582 struct sockaddr_in6 server_addrv6;
3583 struct sockaddr_in server_addrv4;
3584 const struct sockaddr *server_addr;
3585 const struct sockaddr *addrs[2];
3586 socklen_t addrlens[2];
3590 /* Create IPv6 socket */
3592 if (GNUNET_YES == plugin->enable_ipv6)
3594 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
3597 if (NULL == plugin->sockv6)
3599 LOG (GNUNET_ERROR_TYPE_INFO,
3600 _("Disabling IPv6 since it is not supported on this system!\n"));
3601 plugin->enable_ipv6 = GNUNET_NO;
3605 memset (&server_addrv6,
3607 sizeof(struct sockaddr_in6));
3608 #if HAVE_SOCKADDR_IN_SIN_LEN
3609 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3611 server_addrv6.sin6_family = AF_INET6;
3612 if (NULL != bind_v6)
3613 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3615 server_addrv6.sin6_addr = in6addr_any;
3617 if (0 == plugin->port) /* autodetect */
3618 server_addrv6.sin6_port
3619 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3623 server_addrv6.sin6_port = htons (plugin->port);
3624 addrlen = sizeof (struct sockaddr_in6);
3625 server_addr = (const struct sockaddr *) &server_addrv6;
3630 LOG(GNUNET_ERROR_TYPE_DEBUG,
3631 "Binding to IPv6 `%s'\n",
3632 GNUNET_a2s (server_addr,
3636 GNUNET_NETWORK_socket_bind (plugin->sockv6,
3641 if (0 != plugin->port)
3643 tries = 10; /* fail immediately */
3644 break; /* bind failed on specific port */
3647 server_addrv6.sin6_port
3648 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3655 GNUNET_NETWORK_socket_close (plugin->sockv6);
3656 plugin->enable_ipv6 = GNUNET_NO;
3657 plugin->sockv6 = NULL;
3661 plugin->port = ntohs (server_addrv6.sin6_port);
3663 if (NULL != plugin->sockv6)
3665 LOG (GNUNET_ERROR_TYPE_DEBUG,
3666 "IPv6 UDP socket created listinging at %s\n",
3667 GNUNET_a2s (server_addr,
3669 addrs[sockets_created] = server_addr;
3670 addrlens[sockets_created] = addrlen;
3675 LOG (GNUNET_ERROR_TYPE_WARNING,
3676 _("Failed to bind UDP socket to %s: %s\n"),
3677 GNUNET_a2s (server_addr,
3684 /* Create IPv4 socket */
3686 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
3689 if (NULL == plugin->sockv4)
3691 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3693 LOG (GNUNET_ERROR_TYPE_INFO,
3694 _("Disabling IPv4 since it is not supported on this system!\n"));
3695 plugin->enable_ipv4 = GNUNET_NO;
3699 memset (&server_addrv4,
3701 sizeof(struct sockaddr_in));
3702 #if HAVE_SOCKADDR_IN_SIN_LEN
3703 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3705 server_addrv4.sin_family = AF_INET;
3706 if (NULL != bind_v4)
3707 server_addrv4.sin_addr = bind_v4->sin_addr;
3709 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3711 if (0 == plugin->port)
3713 server_addrv4.sin_port
3714 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3718 server_addrv4.sin_port = htons (plugin->port);
3720 addrlen = sizeof (struct sockaddr_in);
3721 server_addr = (const struct sockaddr *) &server_addrv4;
3726 LOG (GNUNET_ERROR_TYPE_DEBUG,
3727 "Binding to IPv4 `%s'\n",
3728 GNUNET_a2s (server_addr,
3733 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3738 if (0 != plugin->port)
3740 tries = 10; /* fail */
3741 break; /* bind failed on specific port */
3745 server_addrv4.sin_port
3746 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3753 GNUNET_NETWORK_socket_close (plugin->sockv4);
3754 plugin->enable_ipv4 = GNUNET_NO;
3755 plugin->sockv4 = NULL;
3759 plugin->port = ntohs (server_addrv4.sin_port);
3762 if (NULL != plugin->sockv4)
3764 LOG (GNUNET_ERROR_TYPE_DEBUG,
3765 "IPv4 socket created on port %s\n",
3766 GNUNET_a2s (server_addr,
3768 addrs[sockets_created] = server_addr;
3769 addrlens[sockets_created] = addrlen;
3774 LOG (GNUNET_ERROR_TYPE_ERROR,
3775 _("Failed to bind UDP socket to %s: %s\n"),
3776 GNUNET_a2s (server_addr,
3782 if (0 == sockets_created)
3784 LOG (GNUNET_ERROR_TYPE_WARNING,
3785 _("Failed to open UDP sockets\n"));
3786 return 0; /* No sockets created, return */
3788 schedule_select_v4 (plugin);
3789 schedule_select_v6 (plugin);
3790 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3796 &udp_nat_port_map_callback,
3800 return sockets_created;
3805 * The exported method. Makes the core api available via a global and
3806 * returns the udp transport API.
3808 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3809 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3812 libgnunet_plugin_transport_udp_init (void *cls)
3814 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3815 struct GNUNET_TRANSPORT_PluginFunctions *api;
3817 unsigned long long port;
3818 unsigned long long aport;
3819 unsigned long long udp_max_bps;
3820 unsigned long long enable_v6;
3821 unsigned long long enable_broadcasting;
3822 unsigned long long enable_broadcasting_recv;
3823 char *bind4_address;
3824 char *bind6_address;
3825 struct GNUNET_TIME_Relative interval;
3826 struct sockaddr_in server_addrv4;
3827 struct sockaddr_in6 server_addrv6;
3832 if (NULL == env->receive)
3834 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3835 initialze the plugin or the API */
3836 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3838 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3839 api->address_to_string = &udp_address_to_string;
3840 api->string_to_address = &udp_string_to_address;
3844 /* Get port number: port == 0 : autodetect a port,
3845 * > 0 : use this port, not given : 2086 default */
3847 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3854 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3857 _("must be in [0,65535]"));
3861 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3868 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3871 _("must be in [0,65535]"));
3876 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3879 enable_v6 = GNUNET_NO;
3881 enable_v6 = GNUNET_YES;
3883 have_bind4 = GNUNET_NO;
3884 memset (&server_addrv4,
3886 sizeof (server_addrv4));
3888 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3893 LOG (GNUNET_ERROR_TYPE_DEBUG,
3894 "Binding UDP plugin to specific address: `%s'\n",
3896 if (1 != inet_pton (AF_INET,
3898 &server_addrv4.sin_addr))
3900 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3903 _("must be valid IPv4 address"));
3904 GNUNET_free (bind4_address);
3907 have_bind4 = GNUNET_YES;
3909 GNUNET_free_non_null (bind4_address);
3910 have_bind6 = GNUNET_NO;
3911 memset (&server_addrv6,
3913 sizeof (server_addrv6));
3915 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3920 LOG (GNUNET_ERROR_TYPE_DEBUG,
3921 "Binding udp plugin to specific address: `%s'\n",
3923 if (1 != inet_pton (AF_INET6,
3925 &server_addrv6.sin6_addr))
3927 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3930 _("must be valid IPv6 address"));
3931 GNUNET_free (bind6_address);
3934 have_bind6 = GNUNET_YES;
3936 GNUNET_free_non_null (bind6_address);
3938 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3941 if (enable_broadcasting == GNUNET_SYSERR)
3942 enable_broadcasting = GNUNET_NO;
3944 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3946 "BROADCAST_RECEIVE");
3947 if (enable_broadcasting_recv == GNUNET_SYSERR)
3948 enable_broadcasting_recv = GNUNET_YES;
3950 if (GNUNET_SYSERR ==
3951 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3953 "BROADCAST_INTERVAL",
3956 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
3960 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3965 /* 50 MB/s == infinity for practical purposes */
3966 udp_max_bps = 1024 * 1024 * 50;
3969 p = GNUNET_new (struct Plugin);
3972 p->broadcast_interval = interval;
3973 p->enable_ipv6 = enable_v6;
3974 p->enable_ipv4 = GNUNET_YES; /* default */
3975 p->enable_broadcasting = enable_broadcasting;
3976 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3978 p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
3980 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3981 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages,
3983 GNUNET_BANDWIDTH_tracker_init (&p->tracker,
3986 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps),
3988 res = setup_sockets (p,
3989 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
3990 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
3992 ( (NULL == p->sockv4) &&
3993 (NULL == p->sockv6) ) )
3995 LOG (GNUNET_ERROR_TYPE_ERROR,
3996 _("Failed to create UDP network sockets\n"));
3997 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
3998 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
3999 GNUNET_SERVER_mst_destroy (p->mst);
4004 /* Setup broadcasting and receiving beacons */
4009 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
4011 api->disconnect_session = &udp_disconnect_session;
4012 api->query_keepalive_factor = &udp_query_keepalive_factor;
4013 api->disconnect_peer = &udp_disconnect;
4014 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
4015 api->address_to_string = &udp_address_to_string;
4016 api->string_to_address = &udp_string_to_address;
4017 api->check_address = &udp_plugin_check_address;
4018 api->get_session = &udp_plugin_get_session;
4019 api->send = &udp_plugin_send;
4020 api->get_network = &udp_plugin_get_network;
4021 api->get_network_for_address = &udp_plugin_get_network_for_address;
4022 api->update_session_timeout = &udp_plugin_update_session_timeout;
4023 api->setup_monitor = &udp_plugin_setup_monitor;
4029 * Function called on each entry in the defragmentation heap to
4033 * @param node node in the heap (to be removed)
4034 * @param element a `struct DefragContext` to be cleaned up
4035 * @param cost unused
4036 * @return #GNUNET_YES
4039 heap_cleanup_iterator (void *cls,
4040 struct GNUNET_CONTAINER_HeapNode *node,
4042 GNUNET_CONTAINER_HeapCostType cost)
4044 struct DefragContext *d_ctx = element;
4046 GNUNET_CONTAINER_heap_remove_node (node);
4047 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
4048 GNUNET_free (d_ctx);
4054 * The exported method. Makes the core api available via a global and
4055 * returns the udp transport API.
4057 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
4061 libgnunet_plugin_transport_udp_done (void *cls)
4063 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
4064 struct Plugin *plugin = api->cls;
4065 struct PrettyPrinterContext *cur;
4066 struct UDP_MessageWrapper *udpw;
4073 stop_broadcast (plugin);
4074 if (NULL != plugin->select_task_v4)
4076 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
4077 plugin->select_task_v4 = NULL;
4079 if (NULL != plugin->select_task_v6)
4081 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
4082 plugin->select_task_v6 = NULL;
4084 if (NULL != plugin->sockv4)
4086 GNUNET_break (GNUNET_OK ==
4087 GNUNET_NETWORK_socket_close (plugin->sockv4));
4088 plugin->sockv4 = NULL;
4090 if (NULL != plugin->sockv6)
4092 GNUNET_break (GNUNET_OK ==
4093 GNUNET_NETWORK_socket_close (plugin->sockv6));
4094 plugin->sockv6 = NULL;
4096 if (NULL != plugin->nat)
4098 GNUNET_NAT_unregister (plugin->nat);
4101 if (NULL != plugin->defrag_ctxs)
4103 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
4104 &heap_cleanup_iterator,
4106 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
4107 plugin->defrag_ctxs = NULL;
4109 if (NULL != plugin->mst)
4111 GNUNET_SERVER_mst_destroy (plugin->mst);
4114 while (NULL != (udpw = plugin->ipv4_queue_head))
4118 udpw->qc (udpw->qc_cls,
4123 while (NULL != (udpw = plugin->ipv6_queue_head))
4127 udpw->qc (udpw->qc_cls,
4132 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
4133 &disconnect_and_free_it,
4135 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
4137 while (NULL != (cur = plugin->ppc_dll_head))
4140 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
4141 plugin->ppc_dll_tail,
4143 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
4144 if (NULL != cur->timeout_task)
4146 GNUNET_SCHEDULER_cancel (cur->timeout_task);
4147 cur->timeout_task = NULL;
4151 GNUNET_free (plugin);
4156 /* end of plugin_transport_udp.c */