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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_service.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 GNUNET_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 struct sockaddr_in s4;
1250 v4 = (const struct IPv4UdpAddress *) addr;
1251 if (GNUNET_OK != check_port (plugin,
1252 ntohs (v4->u4_port)))
1253 return GNUNET_SYSERR;
1254 memset (&s4, 0, sizeof (s4));
1255 s4.sin_family = AF_INET;
1256 #if HAVE_SOCKADDR_IN_SIN_LEN
1257 s4.sin_len = sizeof (s4);
1259 s4.sin_port = v4->u4_port;
1260 s4.sin_addr.s_addr = v4->ipv4_addr;
1263 GNUNET_NAT_test_address (plugin->nat,
1265 sizeof (struct sockaddr_in)))
1266 return GNUNET_SYSERR;
1268 else if (sizeof(struct IPv6UdpAddress) == addrlen)
1270 struct sockaddr_in6 s6;
1272 v6 = (const struct IPv6UdpAddress *) addr;
1273 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1275 GNUNET_break_op (0);
1276 return GNUNET_SYSERR;
1278 memset (&s6, 0, sizeof (s6));
1279 s6.sin6_family = AF_INET6;
1280 #if HAVE_SOCKADDR_IN_SIN_LEN
1281 s6.sin6_len = sizeof (s6);
1283 s6.sin6_port = v6->u6_port;
1284 s6.sin6_addr = v6->ipv6_addr;
1287 GNUNET_NAT_test_address (plugin->nat,
1289 sizeof(struct sockaddr_in6)))
1290 return GNUNET_SYSERR;
1294 GNUNET_break_op (0);
1295 return GNUNET_SYSERR;
1302 * Our external IP address/port mapping has changed.
1304 * @param cls closure, the `struct Plugin`
1305 * @param add_remove #GNUNET_YES to mean the new public IP address,
1306 * #GNUNET_NO to mean the previous (now invalid) one
1307 * @param ac address class the address belongs to
1308 * @param addr either the previous or the new public IP address
1309 * @param addrlen actual length of the @a addr
1312 udp_nat_port_map_callback (void *cls,
1314 enum GNUNET_NAT_AddressClass ac,
1315 const struct sockaddr *addr,
1318 struct Plugin *plugin = cls;
1319 struct GNUNET_HELLO_Address *address;
1320 struct IPv4UdpAddress u4;
1321 struct IPv6UdpAddress u6;
1325 LOG (GNUNET_ERROR_TYPE_DEBUG,
1326 (GNUNET_YES == add_remove)
1327 ? "NAT notification to add address `%s'\n"
1328 : "NAT notification to remove address `%s'\n",
1331 /* convert 'address' to our internal format */
1332 switch (addr->sa_family)
1336 const struct sockaddr_in *i4;
1338 GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
1339 i4 = (const struct sockaddr_in *) addr;
1340 if (0 == ntohs (i4->sin_port))
1348 u4.options = htonl (plugin->myoptions);
1349 u4.ipv4_addr = i4->sin_addr.s_addr;
1350 u4.u4_port = i4->sin_port;
1352 args = sizeof (struct IPv4UdpAddress);
1357 const struct sockaddr_in6 *i6;
1359 GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
1360 i6 = (const struct sockaddr_in6 *) addr;
1361 if (0 == ntohs (i6->sin6_port))
1369 u6.options = htonl (plugin->myoptions);
1370 u6.ipv6_addr = i6->sin6_addr;
1371 u6.u6_port = i6->sin6_port;
1373 args = sizeof (struct IPv6UdpAddress);
1380 /* modify our published address list */
1381 /* TODO: use 'ac' here in the future... */
1382 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1386 GNUNET_HELLO_ADDRESS_INFO_NONE);
1387 plugin->env->notify_address (plugin->env->cls,
1390 GNUNET_HELLO_address_free (address);
1394 /* ********************* Finding sessions ******************* */
1398 * Closure for #session_cmp_it().
1400 struct GNUNET_ATS_SessionCompareContext
1403 * Set to session matching the address.
1405 struct GNUNET_ATS_Session *res;
1408 * Address we are looking for.
1410 const struct GNUNET_HELLO_Address *address;
1415 * Find a session with a matching address.
1417 * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
1418 * @param key peer identity (unused)
1419 * @param value the `struct GNUNET_ATS_Session *`
1420 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1423 session_cmp_it (void *cls,
1424 const struct GNUNET_PeerIdentity *key,
1427 struct GNUNET_ATS_SessionCompareContext *cctx = cls;
1428 struct GNUNET_ATS_Session *s = value;
1430 if (0 == GNUNET_HELLO_address_cmp (s->address,
1433 GNUNET_assert (GNUNET_NO == s->in_destroy);
1442 * Locate an existing session the transport service is using to
1443 * send data to another peer. Performs some basic sanity checks
1444 * on the address and then tries to locate a matching session.
1446 * @param cls the plugin
1447 * @param address the address we should locate the session by
1448 * @return the session if it exists, or NULL if it is not found
1450 static struct GNUNET_ATS_Session *
1451 udp_plugin_lookup_session (void *cls,
1452 const struct GNUNET_HELLO_Address *address)
1454 struct Plugin *plugin = cls;
1455 const struct IPv6UdpAddress *udp_a6;
1456 const struct IPv4UdpAddress *udp_a4;
1457 struct GNUNET_ATS_SessionCompareContext cctx;
1459 if (NULL == address->address)
1464 if (sizeof(struct IPv4UdpAddress) == address->address_length)
1466 if (NULL == plugin->sockv4)
1468 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1469 if (0 == udp_a4->u4_port)
1475 else if (sizeof(struct IPv6UdpAddress) == address->address_length)
1477 if (NULL == plugin->sockv6)
1479 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1480 if (0 == udp_a6->u6_port)
1492 /* check if session already exists */
1493 cctx.address = address;
1495 LOG (GNUNET_ERROR_TYPE_DEBUG,
1496 "Looking for existing session for peer `%s' with address `%s'\n",
1497 GNUNET_i2s (&address->peer),
1498 udp_address_to_string (plugin,
1500 address->address_length));
1501 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1505 if (NULL == cctx.res)
1507 LOG (GNUNET_ERROR_TYPE_DEBUG,
1508 "Found existing session %p\n",
1514 /* ********************** Timeout ****************** */
1518 * Increment session timeout due to activity.
1520 * @param s session to reschedule timeout activity for
1523 reschedule_session_timeout (struct GNUNET_ATS_Session *s)
1525 if (GNUNET_YES == s->in_destroy)
1527 GNUNET_assert (NULL != s->timeout_task);
1528 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1534 * Function that will be called whenever the transport service wants to
1535 * notify the plugin that a session is still active and in use and
1536 * therefore the session timeout for this session has to be updated
1538 * @param cls closure with the `struct Plugin`
1539 * @param peer which peer was the session for
1540 * @param session which session is being updated
1543 udp_plugin_update_session_timeout (void *cls,
1544 const struct GNUNET_PeerIdentity *peer,
1545 struct GNUNET_ATS_Session *session)
1547 struct Plugin *plugin = cls;
1550 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1557 /* Reschedule session timeout */
1558 reschedule_session_timeout (session);
1562 /* ************************* Sending ************************ */
1566 * Remove the given message from the transmission queue and
1567 * update all applicable statistics.
1569 * @param plugin the UDP plugin
1570 * @param udpw message wrapper to dequeue
1573 dequeue (struct Plugin *plugin,
1574 struct UDP_MessageWrapper *udpw)
1576 struct GNUNET_ATS_Session *session = udpw->session;
1578 if (plugin->bytes_in_buffer < udpw->msg_size)
1584 GNUNET_STATISTICS_update (plugin->env->stats,
1585 "# UDP, total bytes in send buffers",
1586 - (long long) udpw->msg_size,
1588 plugin->bytes_in_buffer -= udpw->msg_size;
1590 GNUNET_STATISTICS_update (plugin->env->stats,
1591 "# UDP, total messages in send buffers",
1594 if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length)
1596 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1597 plugin->ipv4_queue_tail,
1600 else if (sizeof(struct IPv6UdpAddress) == udpw->session->address->address_length)
1602 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1603 plugin->ipv6_queue_tail,
1611 GNUNET_assert (session->msgs_in_queue > 0);
1612 session->msgs_in_queue--;
1613 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1614 session->bytes_in_queue -= udpw->msg_size;
1619 * Enqueue a message for transmission and update statistics.
1621 * @param plugin the UDP plugin
1622 * @param udpw message wrapper to queue
1625 enqueue (struct Plugin *plugin,
1626 struct UDP_MessageWrapper *udpw)
1628 struct GNUNET_ATS_Session *session = udpw->session;
1630 if (GNUNET_YES == session->in_destroy)
1635 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1641 GNUNET_STATISTICS_update (plugin->env->stats,
1642 "# UDP, total bytes in send buffers",
1645 plugin->bytes_in_buffer += udpw->msg_size;
1647 GNUNET_STATISTICS_update (plugin->env->stats,
1648 "# UDP, total messages in send buffers",
1651 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
1653 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1654 plugin->ipv4_queue_tail,
1657 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
1659 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1660 plugin->ipv6_queue_tail,
1666 udpw->cont (udpw->cont_cls,
1674 session->msgs_in_queue++;
1675 session->bytes_in_queue += udpw->msg_size;
1680 * We have completed our (attempt) to transmit a message that had to
1681 * be fragmented -- either because we got an ACK saying that all
1682 * fragments were received, or because of timeout / disconnect. Clean
1685 * @param frag_ctx fragmentation context to clean up
1686 * @param result #GNUNET_OK if we succeeded (got ACK),
1687 * #GNUNET_SYSERR if the transmission failed
1690 fragmented_message_done (struct UDP_FragmentationContext *frag_ctx,
1693 struct Plugin *plugin = frag_ctx->plugin;
1694 struct GNUNET_ATS_Session *s = frag_ctx->session;
1695 struct UDP_MessageWrapper *udpw;
1696 struct UDP_MessageWrapper *tmp;
1698 struct GNUNET_TIME_Relative delay;
1700 LOG (GNUNET_ERROR_TYPE_DEBUG,
1701 "%p: Fragmented message removed with result %s\n",
1703 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1704 /* Call continuation for fragmented message */
1705 if (frag_ctx->on_wire_size >= frag_ctx->payload_size)
1706 overhead = frag_ctx->on_wire_size - frag_ctx->payload_size;
1708 overhead = frag_ctx->on_wire_size;
1709 delay = GNUNET_TIME_absolute_get_duration (frag_ctx->start_time);
1710 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1712 LOG (GNUNET_ERROR_TYPE_WARNING,
1713 "Fragmented message acknowledged after %s (expected at %s)\n",
1714 GNUNET_STRINGS_relative_time_to_string (delay,
1716 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1720 LOG (GNUNET_ERROR_TYPE_DEBUG,
1721 "Fragmented message acknowledged after %s (expected at %s)\n",
1722 GNUNET_STRINGS_relative_time_to_string (delay,
1724 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1727 if (NULL != frag_ctx->cont)
1728 frag_ctx->cont (frag_ctx->cont_cls,
1731 s->frag_ctx->payload_size,
1732 frag_ctx->on_wire_size);
1733 GNUNET_STATISTICS_update (plugin->env->stats,
1734 "# UDP, fragmented messages active",
1738 if (GNUNET_OK == result)
1740 GNUNET_STATISTICS_update (plugin->env->stats,
1741 "# UDP, fragmented msgs, messages, sent, success",
1744 GNUNET_STATISTICS_update (plugin->env->stats,
1745 "# UDP, fragmented msgs, bytes payload, sent, success",
1746 s->frag_ctx->payload_size,
1748 GNUNET_STATISTICS_update (plugin->env->stats,
1749 "# UDP, fragmented msgs, bytes overhead, sent, success",
1752 GNUNET_STATISTICS_update (plugin->env->stats,
1753 "# UDP, total, bytes overhead, sent",
1756 GNUNET_STATISTICS_update (plugin->env->stats,
1757 "# UDP, total, bytes payload, sent",
1758 s->frag_ctx->payload_size,
1763 GNUNET_STATISTICS_update (plugin->env->stats,
1764 "# UDP, fragmented msgs, messages, sent, failure",
1767 GNUNET_STATISTICS_update (plugin->env->stats,
1768 "# UDP, fragmented msgs, bytes payload, sent, failure",
1769 s->frag_ctx->payload_size,
1771 GNUNET_STATISTICS_update (plugin->env->stats,
1772 "# UDP, fragmented msgs, bytes payload, sent, failure",
1775 GNUNET_STATISTICS_update (plugin->env->stats,
1776 "# UDP, fragmented msgs, bytes payload, sent, failure",
1781 /* Remove remaining fragments from queue, no need to transmit those
1783 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1785 udpw = plugin->ipv6_queue_head;
1786 while (NULL != udpw)
1789 if ( (udpw->frag_ctx != NULL) &&
1790 (udpw->frag_ctx == frag_ctx) )
1799 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1801 udpw = plugin->ipv4_queue_head;
1802 while (NULL != udpw)
1805 if ( (NULL != udpw->frag_ctx) &&
1806 (udpw->frag_ctx == frag_ctx) )
1815 notify_session_monitor (s->plugin,
1817 GNUNET_TRANSPORT_SS_UPDATE);
1818 GNUNET_FRAGMENT_context_destroy (frag_ctx->frag,
1819 &s->last_expected_msg_delay,
1820 &s->last_expected_ack_delay);
1822 GNUNET_free (frag_ctx);
1827 * We are finished with a fragment in the message queue.
1828 * Notify the continuation and update statistics.
1830 * @param cls the `struct Plugin *`
1831 * @param udpw the queue entry
1832 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1835 qc_fragment_sent (void *cls,
1836 struct UDP_MessageWrapper *udpw,
1839 struct Plugin *plugin = cls;
1841 GNUNET_assert (NULL != udpw->frag_ctx);
1842 if (GNUNET_OK == result)
1844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1845 "Fragment of message with %u bytes transmitted to %s\n",
1846 (unsigned int) udpw->payload_size,
1847 GNUNET_i2s (&udpw->session->target));
1848 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1849 GNUNET_STATISTICS_update (plugin->env->stats,
1850 "# UDP, fragmented msgs, fragments, sent, success",
1853 GNUNET_STATISTICS_update (plugin->env->stats,
1854 "# UDP, fragmented msgs, fragments bytes, sent, success",
1860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1861 "Failed to transmit fragment of message with %u bytes to %s\n",
1862 (unsigned int) udpw->payload_size,
1863 GNUNET_i2s (&udpw->session->target));
1864 fragmented_message_done (udpw->frag_ctx,
1866 GNUNET_STATISTICS_update (plugin->env->stats,
1867 "# UDP, fragmented msgs, fragments, sent, failure",
1870 GNUNET_STATISTICS_update (plugin->env->stats,
1871 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1879 * Function that is called with messages created by the fragmentation
1880 * module. In the case of the `proc` callback of the
1881 * #GNUNET_FRAGMENT_context_create() function, this function must
1882 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1884 * @param cls closure, the `struct UDP_FragmentationContext`
1885 * @param msg the message that was created
1888 enqueue_fragment (void *cls,
1889 const struct GNUNET_MessageHeader *msg)
1891 struct UDP_FragmentationContext *frag_ctx = cls;
1892 struct Plugin *plugin = frag_ctx->plugin;
1893 struct UDP_MessageWrapper *udpw;
1894 struct GNUNET_ATS_Session *session = frag_ctx->session;
1895 size_t msg_len = ntohs (msg->size);
1897 LOG (GNUNET_ERROR_TYPE_DEBUG,
1898 "Enqueuing fragment with %u bytes\n",
1900 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1901 udpw->session = session;
1902 udpw->msg_buf = (char *) &udpw[1];
1903 udpw->msg_size = msg_len;
1904 udpw->payload_size = msg_len; /* FIXME: minus fragment overhead */
1905 udpw->timeout = frag_ctx->timeout;
1906 udpw->start_time = frag_ctx->start_time;
1907 udpw->transmission_time = frag_ctx->next_frag_time;
1908 frag_ctx->next_frag_time
1909 = GNUNET_TIME_absolute_add (frag_ctx->next_frag_time,
1910 frag_ctx->flow_delay_from_other_peer);
1911 udpw->frag_ctx = frag_ctx;
1912 udpw->qc = &qc_fragment_sent;
1913 udpw->qc_cls = plugin;
1914 GNUNET_memcpy (udpw->msg_buf,
1919 if (session->address->address_length == sizeof (struct IPv4UdpAddress))
1920 schedule_select_v4 (plugin);
1922 schedule_select_v6 (plugin);
1927 * We are finished with a message from the message queue.
1928 * Notify the continuation and update statistics.
1930 * @param cls the `struct Plugin *`
1931 * @param udpw the queue entry
1932 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1935 qc_message_sent (void *cls,
1936 struct UDP_MessageWrapper *udpw,
1939 struct Plugin *plugin = cls;
1941 struct GNUNET_TIME_Relative delay;
1943 if (udpw->msg_size >= udpw->payload_size)
1944 overhead = udpw->msg_size - udpw->payload_size;
1946 overhead = udpw->msg_size;
1948 if (NULL != udpw->cont)
1950 delay = GNUNET_TIME_absolute_get_duration (udpw->start_time);
1951 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1953 LOG (GNUNET_ERROR_TYPE_WARNING,
1954 "Message sent via UDP with delay of %s\n",
1955 GNUNET_STRINGS_relative_time_to_string (delay,
1960 LOG (GNUNET_ERROR_TYPE_DEBUG,
1961 "Message sent via UDP with delay of %s\n",
1962 GNUNET_STRINGS_relative_time_to_string (delay,
1965 udpw->cont (udpw->cont_cls,
1966 &udpw->session->target,
1971 if (GNUNET_OK == result)
1973 GNUNET_STATISTICS_update (plugin->env->stats,
1974 "# UDP, unfragmented msgs, messages, sent, success",
1977 GNUNET_STATISTICS_update (plugin->env->stats,
1978 "# UDP, unfragmented msgs, bytes payload, sent, success",
1981 GNUNET_STATISTICS_update (plugin->env->stats,
1982 "# UDP, unfragmented msgs, bytes overhead, sent, success",
1985 GNUNET_STATISTICS_update (plugin->env->stats,
1986 "# UDP, total, bytes overhead, sent",
1989 GNUNET_STATISTICS_update (plugin->env->stats,
1990 "# UDP, total, bytes payload, sent",
1996 GNUNET_STATISTICS_update (plugin->env->stats,
1997 "# UDP, unfragmented msgs, messages, sent, failure",
2000 GNUNET_STATISTICS_update (plugin->env->stats,
2001 "# UDP, unfragmented msgs, bytes payload, sent, failure",
2004 GNUNET_STATISTICS_update (plugin->env->stats,
2005 "# UDP, unfragmented msgs, bytes overhead, sent, failure",
2013 * Function that can be used by the transport service to transmit a
2014 * message using the plugin. Note that in the case of a peer
2015 * disconnecting, the continuation MUST be called prior to the
2016 * disconnect notification itself. This function will be called with
2017 * this peer's HELLO message to initiate a fresh connection to another
2020 * @param cls closure
2021 * @param s which session must be used
2022 * @param msgbuf the message to transmit
2023 * @param msgbuf_size number of bytes in @a msgbuf
2024 * @param priority how important is the message (most plugins will
2025 * ignore message priority and just FIFO)
2026 * @param to how long to wait at most for the transmission (does not
2027 * require plugins to discard the message after the timeout,
2028 * just advisory for the desired delay; most plugins will ignore
2030 * @param cont continuation to call once the message has
2031 * been transmitted (or if the transport is ready
2032 * for the next transmission call; or if the
2033 * peer disconnected...); can be NULL
2034 * @param cont_cls closure for @a cont
2035 * @return number of bytes used (on the physical network, with overheads);
2036 * -1 on hard errors (i.e. address invalid); 0 is a legal value
2037 * and does NOT mean that the message was not transmitted (DV)
2040 udp_plugin_send (void *cls,
2041 struct GNUNET_ATS_Session *s,
2044 unsigned int priority,
2045 struct GNUNET_TIME_Relative to,
2046 GNUNET_TRANSPORT_TransmitContinuation cont,
2049 struct Plugin *plugin = cls;
2050 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2051 struct UDP_FragmentationContext *frag_ctx;
2052 struct UDP_MessageWrapper *udpw;
2053 struct UDPMessage *udp;
2054 char mbuf[udpmlen] GNUNET_ALIGN;
2055 struct GNUNET_TIME_Relative latency;
2057 if ( (sizeof(struct IPv6UdpAddress) == s->address->address_length) &&
2058 (NULL == plugin->sockv6) )
2059 return GNUNET_SYSERR;
2060 if ( (sizeof(struct IPv4UdpAddress) == s->address->address_length) &&
2061 (NULL == plugin->sockv4) )
2062 return GNUNET_SYSERR;
2063 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2066 return GNUNET_SYSERR;
2069 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2074 return GNUNET_SYSERR;
2076 LOG (GNUNET_ERROR_TYPE_DEBUG,
2077 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2079 GNUNET_i2s (&s->target),
2080 udp_address_to_string (plugin,
2081 s->address->address,
2082 s->address->address_length));
2084 udp = (struct UDPMessage *) mbuf;
2085 udp->header.size = htons (udpmlen);
2086 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2087 udp->reserved = htonl (0);
2088 udp->sender = *plugin->env->my_identity;
2090 /* We do not update the session time out here! Otherwise this
2091 * session will not timeout since we send keep alive before session
2094 * For UDP we update session timeout only on receive, this will
2095 * cover keep alives, since remote peer will reply with keep alive
2098 if (udpmlen <= UDP_MTU)
2100 /* unfragmented message */
2101 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2103 udpw->msg_buf = (char *) &udpw[1];
2104 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2105 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2106 udpw->start_time = GNUNET_TIME_absolute_get ();
2107 udpw->timeout = GNUNET_TIME_relative_to_absolute (to);
2108 udpw->transmission_time = s->last_transmit_time;
2109 s->last_transmit_time
2110 = GNUNET_TIME_absolute_add (s->last_transmit_time,
2111 s->flow_delay_from_other_peer);
2113 udpw->cont_cls = cont_cls;
2114 udpw->frag_ctx = NULL;
2115 udpw->qc = &qc_message_sent;
2116 udpw->qc_cls = plugin;
2117 GNUNET_memcpy (udpw->msg_buf,
2119 sizeof (struct UDPMessage));
2120 GNUNET_memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)],
2125 GNUNET_STATISTICS_update (plugin->env->stats,
2126 "# UDP, unfragmented messages queued total",
2129 GNUNET_STATISTICS_update (plugin->env->stats,
2130 "# UDP, unfragmented bytes payload queued total",
2133 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2134 schedule_select_v4 (plugin);
2136 schedule_select_v6 (plugin);
2140 /* fragmented message */
2141 if (NULL != s->frag_ctx)
2142 return GNUNET_SYSERR;
2143 GNUNET_memcpy (&udp[1],
2146 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2147 frag_ctx->plugin = plugin;
2148 frag_ctx->session = s;
2149 frag_ctx->cont = cont;
2150 frag_ctx->cont_cls = cont_cls;
2151 frag_ctx->start_time = GNUNET_TIME_absolute_get ();
2152 frag_ctx->next_frag_time = s->last_transmit_time;
2153 frag_ctx->flow_delay_from_other_peer
2154 = GNUNET_TIME_relative_divide (s->flow_delay_from_other_peer,
2157 frag_ctx->timeout = GNUNET_TIME_relative_to_absolute (to);
2158 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2159 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2160 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2163 s->last_expected_msg_delay,
2164 s->last_expected_ack_delay,
2168 s->frag_ctx = frag_ctx;
2169 s->last_transmit_time = frag_ctx->next_frag_time;
2170 latency = GNUNET_TIME_absolute_get_remaining (s->last_transmit_time);
2171 if (latency.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2172 LOG (GNUNET_ERROR_TYPE_WARNING,
2173 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2174 GNUNET_STRINGS_relative_time_to_string (latency,
2176 GNUNET_i2s (&s->target),
2177 (unsigned int) s->msgs_in_queue);
2179 LOG (GNUNET_ERROR_TYPE_DEBUG,
2180 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2181 GNUNET_STRINGS_relative_time_to_string (latency,
2183 GNUNET_i2s (&s->target),
2184 (unsigned int) s->msgs_in_queue);
2186 GNUNET_STATISTICS_update (plugin->env->stats,
2187 "# UDP, fragmented messages active",
2190 GNUNET_STATISTICS_update (plugin->env->stats,
2191 "# UDP, fragmented messages, total",
2194 GNUNET_STATISTICS_update (plugin->env->stats,
2195 "# UDP, fragmented bytes (payload)",
2196 frag_ctx->payload_size,
2199 notify_session_monitor (s->plugin,
2201 GNUNET_TRANSPORT_SS_UPDATE);
2206 /* ********************** Receiving ********************** */
2210 * Closure for #find_receive_context().
2212 struct FindReceiveContext
2215 * Where to store the result.
2217 struct DefragContext *rc;
2220 * Session associated with this context.
2222 struct GNUNET_ATS_Session *session;
2227 const union UdpAddress *udp_addr;
2230 * Number of bytes in @e udp_addr.
2232 size_t udp_addr_len;
2238 * Scan the heap for a receive context with the given address.
2240 * @param cls the `struct FindReceiveContext`
2241 * @param node internal node of the heap
2242 * @param element value stored at the node (a `struct ReceiveContext`)
2243 * @param cost cost associated with the node
2244 * @return #GNUNET_YES if we should continue to iterate,
2245 * #GNUNET_NO if not.
2248 find_receive_context (void *cls,
2249 struct GNUNET_CONTAINER_HeapNode *node,
2251 GNUNET_CONTAINER_HeapCostType cost)
2253 struct FindReceiveContext *frc = cls;
2254 struct DefragContext *e = element;
2256 if ( (frc->udp_addr_len == e->udp_addr_len) &&
2257 (0 == memcmp (frc->udp_addr,
2259 frc->udp_addr_len)) )
2269 * Functions with this signature are called whenever we need to close
2270 * a session due to a disconnect or failure to establish a connection.
2272 * @param cls closure with the `struct Plugin`
2273 * @param s session to close down
2274 * @return #GNUNET_OK on success
2277 udp_disconnect_session (void *cls,
2278 struct GNUNET_ATS_Session *s)
2280 struct Plugin *plugin = cls;
2281 struct UDP_MessageWrapper *udpw;
2282 struct UDP_MessageWrapper *next;
2283 struct FindReceiveContext frc;
2285 GNUNET_assert (GNUNET_YES != s->in_destroy);
2286 LOG (GNUNET_ERROR_TYPE_DEBUG,
2287 "Session %p to peer `%s' at address %s ended\n",
2289 GNUNET_i2s (&s->target),
2290 udp_address_to_string (plugin,
2291 s->address->address,
2292 s->address->address_length));
2293 if (NULL != s->timeout_task)
2295 GNUNET_SCHEDULER_cancel (s->timeout_task);
2296 s->timeout_task = NULL;
2298 if (NULL != s->frag_ctx)
2300 /* Remove fragmented message due to disconnect */
2301 fragmented_message_done (s->frag_ctx,
2304 GNUNET_assert (GNUNET_YES ==
2305 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
2309 frc.udp_addr = s->address->address;
2310 frc.udp_addr_len = s->address->address_length;
2311 /* Lookup existing receive context for this address */
2312 if (NULL != plugin->defrag_ctxs)
2314 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2315 &find_receive_context,
2319 struct DefragContext *d_ctx = frc.rc;
2321 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
2322 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2323 GNUNET_free (d_ctx);
2326 s->in_destroy = GNUNET_YES;
2327 next = plugin->ipv4_queue_head;
2328 while (NULL != (udpw = next))
2331 if (udpw->session == s)
2335 udpw->qc (udpw->qc_cls,
2341 next = plugin->ipv6_queue_head;
2342 while (NULL != (udpw = next))
2345 if (udpw->session == s)
2349 udpw->qc (udpw->qc_cls,
2355 if ( (NULL != s->frag_ctx) &&
2356 (NULL != s->frag_ctx->cont) )
2358 /* The 'frag_ctx' itself will be freed in #free_session() a bit
2359 later, as it might be in use right now */
2360 LOG (GNUNET_ERROR_TYPE_DEBUG,
2361 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
2362 GNUNET_i2s (&s->target));
2363 s->frag_ctx->cont (s->frag_ctx->cont_cls,
2366 s->frag_ctx->payload_size,
2367 s->frag_ctx->on_wire_size);
2369 notify_session_monitor (s->plugin,
2371 GNUNET_TRANSPORT_SS_DONE);
2372 plugin->env->session_end (plugin->env->cls,
2375 GNUNET_STATISTICS_set (plugin->env->stats,
2376 "# UDP sessions active",
2377 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2386 * Handle a #GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK message.
2388 * @param plugin the UDP plugin
2389 * @param msg the (presumed) UDP ACK message
2390 * @param udp_addr sender address
2391 * @param udp_addr_len number of bytes in @a udp_addr
2394 read_process_ack (struct Plugin *plugin,
2395 const struct GNUNET_MessageHeader *msg,
2396 const union UdpAddress *udp_addr,
2397 socklen_t udp_addr_len)
2399 const struct GNUNET_MessageHeader *ack;
2400 const struct UDP_ACK_Message *udp_ack;
2401 struct GNUNET_HELLO_Address *address;
2402 struct GNUNET_ATS_Session *s;
2403 struct GNUNET_TIME_Relative flow_delay;
2405 /* check message format */
2406 if (ntohs (msg->size)
2407 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2409 GNUNET_break_op (0);
2412 udp_ack = (const struct UDP_ACK_Message *) msg;
2413 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2414 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2420 /* Locate session */
2421 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2425 GNUNET_HELLO_ADDRESS_INFO_NONE);
2426 s = udp_plugin_lookup_session (plugin,
2430 LOG (GNUNET_ERROR_TYPE_WARNING,
2431 "UDP session of address %s for ACK not found\n",
2432 udp_address_to_string (plugin,
2434 address->address_length));
2435 GNUNET_HELLO_address_free (address);
2438 if (NULL == s->frag_ctx)
2440 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2441 "Fragmentation context of address %s for ACK (%s) not found\n",
2442 udp_address_to_string (plugin,
2444 address->address_length),
2445 GNUNET_FRAGMENT_print_ack (ack));
2446 GNUNET_HELLO_address_free (address);
2449 GNUNET_HELLO_address_free (address);
2451 /* evaluate flow delay: how long should we wait between messages? */
2452 if (UINT32_MAX == ntohl (udp_ack->delay))
2454 /* Other peer asked for us to terminate the session */
2455 LOG (GNUNET_ERROR_TYPE_INFO,
2456 "Asked to disconnect UDP session of %s\n",
2457 GNUNET_i2s (&udp_ack->sender));
2458 udp_disconnect_session (plugin,
2462 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2463 if (flow_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2464 LOG (GNUNET_ERROR_TYPE_WARNING,
2465 "We received a sending delay of %s for %s\n",
2466 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2468 GNUNET_i2s (&udp_ack->sender));
2470 LOG (GNUNET_ERROR_TYPE_DEBUG,
2471 "We received a sending delay of %s for %s\n",
2472 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2474 GNUNET_i2s (&udp_ack->sender));
2475 /* Flow delay is for the reassembled packet, however, our delay
2476 is per packet, so we need to adjust: */
2477 s->flow_delay_from_other_peer = flow_delay;
2481 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2484 LOG (GNUNET_ERROR_TYPE_DEBUG,
2485 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2486 (unsigned int) ntohs (msg->size),
2487 GNUNET_i2s (&udp_ack->sender),
2488 udp_address_to_string (plugin,
2491 /* Expect more ACKs to arrive */
2495 /* Remove fragmented message after successful sending */
2496 LOG (GNUNET_ERROR_TYPE_DEBUG,
2497 "Message from %s at %s full ACK'ed\n",
2498 GNUNET_i2s (&udp_ack->sender),
2499 udp_address_to_string (plugin,
2502 fragmented_message_done (s->frag_ctx,
2508 * Message tokenizer has broken up an incomming message. Pass it on
2511 * @param cls the `struct Plugin *`
2512 * @param client the `struct GNUNET_ATS_Session *`
2513 * @param hdr the actual message
2514 * @return #GNUNET_OK (always)
2517 process_inbound_tokenized_messages (void *cls,
2519 const struct GNUNET_MessageHeader *hdr)
2521 struct Plugin *plugin = cls;
2522 struct GNUNET_ATS_Session *session = client;
2524 if (GNUNET_YES == session->in_destroy)
2526 reschedule_session_timeout (session);
2527 session->flow_delay_for_other_peer
2528 = plugin->env->receive (plugin->env->cls,
2537 * Destroy a session, plugin is being unloaded.
2539 * @param cls the `struct Plugin`
2540 * @param key hash of public key of target peer
2541 * @param value a `struct PeerSession *` to clean up
2542 * @return #GNUNET_OK (continue to iterate)
2545 disconnect_and_free_it (void *cls,
2546 const struct GNUNET_PeerIdentity *key,
2549 struct Plugin *plugin = cls;
2551 udp_disconnect_session (plugin,
2558 * Disconnect from a remote node. Clean up session if we have one for
2561 * @param cls closure for this call (should be handle to Plugin)
2562 * @param target the peeridentity of the peer to disconnect
2563 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
2566 udp_disconnect (void *cls,
2567 const struct GNUNET_PeerIdentity *target)
2569 struct Plugin *plugin = cls;
2571 LOG (GNUNET_ERROR_TYPE_DEBUG,
2572 "Disconnecting from peer `%s'\n",
2573 GNUNET_i2s (target));
2574 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
2576 &disconnect_and_free_it,
2582 * Session was idle, so disconnect it.
2584 * @param cls the `struct GNUNET_ATS_Session` to time out
2587 session_timeout (void *cls)
2589 struct GNUNET_ATS_Session *s = cls;
2590 struct Plugin *plugin = s->plugin;
2591 struct GNUNET_TIME_Relative left;
2593 s->timeout_task = NULL;
2594 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
2595 if (left.rel_value_us > 0)
2597 /* not actually our turn yet, but let's at least update
2598 the monitor, it may think we're about to die ... */
2599 notify_session_monitor (s->plugin,
2601 GNUNET_TRANSPORT_SS_UPDATE);
2602 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
2607 LOG (GNUNET_ERROR_TYPE_DEBUG,
2608 "Session %p was idle for %s, disconnecting\n",
2610 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
2612 /* call session destroy function */
2613 udp_disconnect_session (plugin,
2619 * Allocate a new session for the given endpoint address.
2620 * Note that this function does not inform the service
2621 * of the new session, this is the responsibility of the
2622 * caller (if needed).
2624 * @param cls the `struct Plugin`
2625 * @param address address of the other peer to use
2626 * @param network_type network type the address belongs to
2627 * @return NULL on error, otherwise session handle
2629 static struct GNUNET_ATS_Session *
2630 udp_plugin_create_session (void *cls,
2631 const struct GNUNET_HELLO_Address *address,
2632 enum GNUNET_ATS_Network_Type network_type)
2634 struct Plugin *plugin = cls;
2635 struct GNUNET_ATS_Session *s;
2637 s = GNUNET_new (struct GNUNET_ATS_Session);
2639 s->address = GNUNET_HELLO_address_copy (address);
2640 s->target = address->peer;
2641 s->last_transmit_time = GNUNET_TIME_absolute_get ();
2642 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2644 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
2645 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
2646 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
2647 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
2648 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
2651 s->scope = network_type;
2653 LOG (GNUNET_ERROR_TYPE_DEBUG,
2654 "Creating new session %p for peer `%s' address `%s'\n",
2656 GNUNET_i2s (&address->peer),
2657 udp_address_to_string (plugin,
2659 address->address_length));
2660 GNUNET_assert (GNUNET_OK ==
2661 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
2664 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
2665 GNUNET_STATISTICS_set (plugin->env->stats,
2666 "# UDP sessions active",
2667 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2669 notify_session_monitor (plugin,
2671 GNUNET_TRANSPORT_SS_INIT);
2677 * Creates a new outbound session the transport service will use to
2678 * send data to the peer.
2680 * @param cls the `struct Plugin *`
2681 * @param address the address
2682 * @return the session or NULL of max connections exceeded
2684 static struct GNUNET_ATS_Session *
2685 udp_plugin_get_session (void *cls,
2686 const struct GNUNET_HELLO_Address *address)
2688 struct Plugin *plugin = cls;
2689 struct GNUNET_ATS_Session *s;
2690 enum GNUNET_ATS_Network_Type network_type = GNUNET_ATS_NET_UNSPECIFIED;
2691 const struct IPv4UdpAddress *udp_v4;
2692 const struct IPv6UdpAddress *udp_v6;
2694 if (NULL == address)
2699 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
2700 (address->address_length != sizeof(struct IPv6UdpAddress)) )
2702 GNUNET_break_op (0);
2705 if (NULL != (s = udp_plugin_lookup_session (cls,
2709 /* need to create new session */
2710 if (sizeof (struct IPv4UdpAddress) == address->address_length)
2712 struct sockaddr_in v4;
2714 udp_v4 = (const struct IPv4UdpAddress *) address->address;
2715 memset (&v4, '\0', sizeof (v4));
2716 v4.sin_family = AF_INET;
2717 #if HAVE_SOCKADDR_IN_SIN_LEN
2718 v4.sin_len = sizeof (struct sockaddr_in);
2720 v4.sin_port = udp_v4->u4_port;
2721 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
2722 network_type = plugin->env->get_address_type (plugin->env->cls,
2723 (const struct sockaddr *) &v4,
2726 if (sizeof (struct IPv6UdpAddress) == address->address_length)
2728 struct sockaddr_in6 v6;
2730 udp_v6 = (const struct IPv6UdpAddress *) address->address;
2731 memset (&v6, '\0', sizeof (v6));
2732 v6.sin6_family = AF_INET6;
2733 #if HAVE_SOCKADDR_IN_SIN_LEN
2734 v6.sin6_len = sizeof (struct sockaddr_in6);
2736 v6.sin6_port = udp_v6->u6_port;
2737 v6.sin6_addr = udp_v6->ipv6_addr;
2738 network_type = plugin->env->get_address_type (plugin->env->cls,
2739 (const struct sockaddr *) &v6,
2742 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2743 return udp_plugin_create_session (cls,
2750 * We've received a UDP Message. Process it (pass contents to main service).
2752 * @param plugin plugin context
2753 * @param msg the message
2754 * @param udp_addr sender address
2755 * @param udp_addr_len number of bytes in @a udp_addr
2756 * @param network_type network type the address belongs to
2759 process_udp_message (struct Plugin *plugin,
2760 const struct UDPMessage *msg,
2761 const union UdpAddress *udp_addr,
2762 size_t udp_addr_len,
2763 enum GNUNET_ATS_Network_Type network_type)
2765 struct GNUNET_ATS_Session *s;
2766 struct GNUNET_HELLO_Address *address;
2768 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2769 if (0 != ntohl (msg->reserved))
2774 if (ntohs (msg->header.size)
2775 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2781 address = GNUNET_HELLO_address_allocate (&msg->sender,
2785 GNUNET_HELLO_ADDRESS_INFO_NONE);
2787 (s = udp_plugin_lookup_session (plugin,
2790 s = udp_plugin_create_session (plugin,
2793 plugin->env->session_start (plugin->env->cls,
2797 notify_session_monitor (plugin,
2799 GNUNET_TRANSPORT_SS_UP);
2801 GNUNET_free (address);
2804 GNUNET_SERVER_mst_receive (plugin->mst,
2806 (const char *) &msg[1],
2807 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2811 if ( (0 == s->rc) &&
2812 (GNUNET_YES == s->in_destroy) )
2818 * Process a defragmented message.
2820 * @param cls the `struct DefragContext *`
2821 * @param msg the message
2824 fragment_msg_proc (void *cls,
2825 const struct GNUNET_MessageHeader *msg)
2827 struct DefragContext *dc = cls;
2828 const struct UDPMessage *um;
2830 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2832 GNUNET_break_op (0);
2835 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2837 GNUNET_break_op (0);
2840 um = (const struct UDPMessage *) msg;
2841 dc->sender = um->sender;
2842 dc->have_sender = GNUNET_YES;
2843 process_udp_message (dc->plugin,
2852 * We finished sending an acknowledgement. Update
2855 * @param cls the `struct Plugin`
2856 * @param udpw message queue entry of the ACK
2857 * @param result #GNUNET_OK if the transmission worked,
2858 * #GNUNET_SYSERR if we failed to send the ACK
2861 ack_message_sent (void *cls,
2862 struct UDP_MessageWrapper *udpw,
2865 struct Plugin *plugin = cls;
2867 if (GNUNET_OK == result)
2869 GNUNET_STATISTICS_update (plugin->env->stats,
2870 "# UDP, ACK messages sent",
2876 GNUNET_STATISTICS_update (plugin->env->stats,
2877 "# UDP, ACK transmissions failed",
2885 * Transmit an acknowledgement.
2887 * @param cls the `struct DefragContext *`
2888 * @param id message ID (unused)
2889 * @param msg ack to transmit
2892 ack_proc (void *cls,
2894 const struct GNUNET_MessageHeader *msg)
2896 struct DefragContext *rc = cls;
2897 struct Plugin *plugin = rc->plugin;
2898 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2899 struct UDP_ACK_Message *udp_ack;
2901 struct UDP_MessageWrapper *udpw;
2902 struct GNUNET_ATS_Session *s;
2903 struct GNUNET_HELLO_Address *address;
2905 if (GNUNET_NO == rc->have_sender)
2907 /* tried to defragment but never succeeded, hence will not ACK */
2908 /* This can happen if we just lost msgs */
2909 GNUNET_STATISTICS_update (plugin->env->stats,
2910 "# UDP, fragments discarded without ACK",
2915 address = GNUNET_HELLO_address_allocate (&rc->sender,
2919 GNUNET_HELLO_ADDRESS_INFO_NONE);
2920 s = udp_plugin_lookup_session (plugin,
2922 GNUNET_HELLO_address_free (address);
2925 LOG (GNUNET_ERROR_TYPE_ERROR,
2926 "Trying to transmit ACK to peer `%s' but no session found!\n",
2927 udp_address_to_string (plugin,
2930 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2931 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2933 GNUNET_STATISTICS_update (plugin->env->stats,
2934 "# UDP, ACK transmissions failed",
2939 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
2940 s->flow_delay_for_other_peer.rel_value_us)
2942 else if (s->flow_delay_for_other_peer.rel_value_us < UINT32_MAX)
2943 delay = s->flow_delay_for_other_peer.rel_value_us;
2945 delay = UINT32_MAX - 1; /* largest value we can communicate */
2946 LOG (GNUNET_ERROR_TYPE_DEBUG,
2947 "Sending ACK to `%s' including delay of %s\n",
2948 udp_address_to_string (plugin,
2951 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2953 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2954 udpw->msg_size = msize;
2955 udpw->payload_size = 0;
2957 udpw->start_time = GNUNET_TIME_absolute_get ();
2958 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2959 udpw->msg_buf = (char *) &udpw[1];
2960 udpw->qc = &ack_message_sent;
2961 udpw->qc_cls = plugin;
2962 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2963 udp_ack->header.size = htons ((uint16_t) msize);
2964 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2965 udp_ack->delay = htonl (delay);
2966 udp_ack->sender = *plugin->env->my_identity;
2967 GNUNET_memcpy (&udp_ack[1],
2972 notify_session_monitor (plugin,
2974 GNUNET_TRANSPORT_SS_UPDATE);
2975 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2976 schedule_select_v4 (plugin);
2978 schedule_select_v6 (plugin);
2983 * We received a fragment, process it.
2985 * @param plugin our plugin
2986 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2987 * @param udp_addr sender address
2988 * @param udp_addr_len number of bytes in @a udp_addr
2989 * @param network_type network type the address belongs to
2992 read_process_fragment (struct Plugin *plugin,
2993 const struct GNUNET_MessageHeader *msg,
2994 const union UdpAddress *udp_addr,
2995 size_t udp_addr_len,
2996 enum GNUNET_ATS_Network_Type network_type)
2998 struct DefragContext *d_ctx;
2999 struct GNUNET_TIME_Absolute now;
3000 struct FindReceiveContext frc;
3003 frc.udp_addr = udp_addr;
3004 frc.udp_addr_len = udp_addr_len;
3006 /* Lookup existing receive context for this address */
3007 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
3008 &find_receive_context,
3010 now = GNUNET_TIME_absolute_get ();
3015 /* Create a new defragmentation context */
3016 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
3017 GNUNET_memcpy (&d_ctx[1],
3020 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
3021 d_ctx->udp_addr_len = udp_addr_len;
3022 d_ctx->network_type = network_type;
3023 d_ctx->plugin = plugin;
3024 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
3026 UDP_MAX_MESSAGES_IN_DEFRAG,
3030 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
3032 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3033 LOG (GNUNET_ERROR_TYPE_DEBUG,
3034 "Created new defragmentation context for %u-byte fragment from `%s'\n",
3035 (unsigned int) ntohs (msg->size),
3036 udp_address_to_string (plugin,
3042 LOG (GNUNET_ERROR_TYPE_DEBUG,
3043 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
3044 (unsigned int) ntohs (msg->size),
3045 udp_address_to_string (plugin,
3051 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag,
3054 /* keep this 'rc' from expiring */
3055 GNUNET_CONTAINER_heap_update_cost (d_ctx->hnode,
3056 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3058 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
3059 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
3061 /* remove 'rc' that was inactive the longest */
3062 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
3063 GNUNET_assert (NULL != d_ctx);
3064 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3065 GNUNET_free (d_ctx);
3066 GNUNET_STATISTICS_update (plugin->env->stats,
3067 "# UDP, Defragmentations aborted",
3075 * Read and process a message from the given socket.
3077 * @param plugin the overall plugin
3078 * @param rsock socket to read from
3081 udp_select_read (struct Plugin *plugin,
3082 struct GNUNET_NETWORK_Handle *rsock)
3085 struct sockaddr_storage addr;
3086 char buf[65536] GNUNET_ALIGN;
3088 const struct GNUNET_MessageHeader *msg;
3089 struct IPv4UdpAddress v4;
3090 struct IPv6UdpAddress v6;
3091 const struct sockaddr *sa;
3092 const struct sockaddr_in *sa4;
3093 const struct sockaddr_in6 *sa6;
3094 const union UdpAddress *int_addr;
3095 size_t int_addr_len;
3096 enum GNUNET_ATS_Network_Type network_type;
3098 fromlen = sizeof (addr);
3102 size = GNUNET_NETWORK_socket_recvfrom (rsock,
3105 (struct sockaddr *) &addr,
3107 sa = (const struct sockaddr *) &addr;
3109 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
3110 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
3111 * on this socket has failed.
3113 * WSAECONNRESET - The virtual circuit was reset by the remote side
3114 * executing a hard or abortive close. The application should close
3115 * the socket; it is no longer usable. On a UDP-datagram socket this
3116 * error indicates a previous send operation resulted in an ICMP Port
3117 * Unreachable message.
3119 if ( (-1 == size) &&
3120 (ECONNRESET == errno) )
3125 LOG (GNUNET_ERROR_TYPE_DEBUG,
3126 "UDP failed to receive data: %s\n",
3128 /* Connection failure or something. Not a protocol violation. */
3132 /* Check if this is a STUN packet */
3134 GNUNET_NAT_stun_handle_packet (plugin->nat,
3135 (const struct sockaddr *) &addr,
3139 return; /* was STUN, do not process further */
3141 if (size < sizeof(struct GNUNET_MessageHeader))
3143 LOG (GNUNET_ERROR_TYPE_WARNING,
3144 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
3145 (unsigned int ) size,
3148 /* _MAY_ be a connection failure (got partial message) */
3149 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
3150 GNUNET_break_op (0);
3154 msg = (const struct GNUNET_MessageHeader *) buf;
3155 LOG (GNUNET_ERROR_TYPE_DEBUG,
3156 "UDP received %u-byte message from `%s' type %u\n",
3157 (unsigned int) size,
3161 if (size != ntohs (msg->size))
3163 LOG (GNUNET_ERROR_TYPE_WARNING,
3164 "UDP malformed message (size %u) header from %s\n",
3165 (unsigned int) size,
3168 GNUNET_break_op (0);
3171 GNUNET_STATISTICS_update (plugin->env->stats,
3172 "# UDP, total bytes received",
3175 network_type = plugin->env->get_address_type (plugin->env->cls,
3178 switch (sa->sa_family)
3181 sa4 = (const struct sockaddr_in *) &addr;
3183 v4.ipv4_addr = sa4->sin_addr.s_addr;
3184 v4.u4_port = sa4->sin_port;
3185 int_addr = (union UdpAddress *) &v4;
3186 int_addr_len = sizeof (v4);
3189 sa6 = (const struct sockaddr_in6 *) &addr;
3191 v6.ipv6_addr = sa6->sin6_addr;
3192 v6.u6_port = sa6->sin6_port;
3193 int_addr = (union UdpAddress *) &v6;
3194 int_addr_len = sizeof (v6);
3201 switch (ntohs (msg->type))
3203 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
3204 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
3205 udp_broadcast_receive (plugin,
3212 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
3213 if (ntohs (msg->size) < sizeof(struct UDPMessage))
3218 process_udp_message (plugin,
3219 (const struct UDPMessage *) msg,
3224 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
3225 read_process_ack (plugin,
3230 case GNUNET_MESSAGE_TYPE_FRAGMENT:
3231 read_process_fragment (plugin,
3245 * Removes messages from the transmission queue that have
3246 * timed out, and then selects a message that should be
3249 * @param plugin the UDP plugin
3250 * @param sock which socket should we process the queue for (v4 or v6)
3251 * @return message selected for transmission, or NULL for none
3253 static struct UDP_MessageWrapper *
3254 remove_timeout_messages_and_select (struct Plugin *plugin,
3255 struct GNUNET_NETWORK_Handle *sock)
3257 struct UDP_MessageWrapper *udpw;
3258 struct GNUNET_TIME_Relative remaining;
3259 struct GNUNET_ATS_Session *session;
3262 removed = GNUNET_NO;
3263 udpw = (sock == plugin->sockv4)
3264 ? plugin->ipv4_queue_head
3265 : plugin->ipv6_queue_head;
3266 while (NULL != udpw)
3268 session = udpw->session;
3269 /* Find messages with timeout */
3270 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
3271 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
3273 /* Message timed out */
3274 removed = GNUNET_YES;
3277 udpw->qc (udpw->qc_cls,
3282 if (sock == plugin->sockv4)
3284 udpw = plugin->ipv4_queue_head;
3286 else if (sock == plugin->sockv6)
3288 udpw = plugin->ipv6_queue_head;
3292 GNUNET_break (0); /* should never happen */
3295 GNUNET_STATISTICS_update (plugin->env->stats,
3296 "# messages discarded due to timeout",
3302 /* Message did not time out, check transmission time */
3303 remaining = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
3304 if (0 == remaining.rel_value_us)
3306 /* this message is not delayed */
3307 LOG (GNUNET_ERROR_TYPE_DEBUG,
3308 "Message for peer `%s' (%u bytes) is not delayed \n",
3309 GNUNET_i2s (&udpw->session->target),
3310 udpw->payload_size);
3311 break; /* Found message to send, break */
3315 /* Message is delayed, try next */
3316 LOG (GNUNET_ERROR_TYPE_DEBUG,
3317 "Message for peer `%s' (%u bytes) is delayed for %s\n",
3318 GNUNET_i2s (&udpw->session->target),
3320 GNUNET_STRINGS_relative_time_to_string (remaining,
3326 if (GNUNET_YES == removed)
3327 notify_session_monitor (session->plugin,
3329 GNUNET_TRANSPORT_SS_UPDATE);
3335 * We failed to transmit a message via UDP. Generate
3336 * a descriptive error message.
3338 * @param plugin our plugin
3339 * @param sa target address we were trying to reach
3340 * @param slen number of bytes in @a sa
3341 * @param error the errno value returned from the sendto() call
3344 analyze_send_error (struct Plugin *plugin,
3345 const struct sockaddr *sa,
3349 enum GNUNET_ATS_Network_Type type;
3351 type = plugin->env->get_address_type (plugin->env->cls,
3354 if ( ( (GNUNET_ATS_NET_LAN == type) ||
3355 (GNUNET_ATS_NET_WAN == type) ) &&
3356 ( (ENETUNREACH == errno) ||
3357 (ENETDOWN == errno) ) )
3359 if (slen == sizeof (struct sockaddr_in))
3361 /* IPv4: "Network unreachable" or "Network down"
3363 * This indicates we do not have connectivity
3365 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3366 _("UDP could not transmit message to `%s': "
3367 "Network seems down, please check your network configuration\n"),
3371 if (slen == sizeof (struct sockaddr_in6))
3373 /* IPv6: "Network unreachable" or "Network down"
3375 * This indicates that this system is IPv6 enabled, but does not
3376 * have a valid global IPv6 address assigned or we do not have
3379 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3380 _("UDP could not transmit IPv6 message! "
3381 "Please check your network configuration and disable IPv6 if your "
3382 "connection does not have a global IPv6 address\n"));
3387 LOG (GNUNET_ERROR_TYPE_WARNING,
3388 "UDP could not transmit message to `%s': `%s'\n",
3397 * It is time to try to transmit a UDP message. Select one
3400 * @param plugin the plugin
3401 * @param sock which socket (v4/v6) to send on
3404 udp_select_send (struct Plugin *plugin,
3405 struct GNUNET_NETWORK_Handle *sock)
3409 const struct sockaddr *a;
3410 const struct IPv4UdpAddress *u4;
3411 struct sockaddr_in a4;
3412 const struct IPv6UdpAddress *u6;
3413 struct sockaddr_in6 a6;
3414 struct UDP_MessageWrapper *udpw;
3416 /* Find message(s) to send */
3417 while (NULL != (udpw = remove_timeout_messages_and_select (plugin,
3420 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
3422 u4 = udpw->session->address->address;
3426 a4.sin_family = AF_INET;
3427 #if HAVE_SOCKADDR_IN_SIN_LEN
3428 a4.sin_len = sizeof (a4);
3430 a4.sin_port = u4->u4_port;
3431 a4.sin_addr.s_addr = u4->ipv4_addr;
3432 a = (const struct sockaddr *) &a4;
3435 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
3437 u6 = udpw->session->address->address;
3441 a6.sin6_family = AF_INET6;
3442 #if HAVE_SOCKADDR_IN_SIN_LEN
3443 a6.sin6_len = sizeof (a6);
3445 a6.sin6_port = u6->u6_port;
3446 a6.sin6_addr = u6->ipv6_addr;
3447 a = (const struct sockaddr *) &a6;
3455 udpw->qc (udpw->qc_cls,
3458 notify_session_monitor (plugin,
3460 GNUNET_TRANSPORT_SS_UPDATE);
3464 sent = GNUNET_NETWORK_socket_sendto (sock,
3469 udpw->session->last_transmit_time
3470 = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
3471 udpw->session->last_transmit_time);
3474 if (GNUNET_SYSERR == sent)
3477 analyze_send_error (plugin,
3481 udpw->qc (udpw->qc_cls,
3484 GNUNET_STATISTICS_update (plugin->env->stats,
3485 "# UDP, total, bytes, sent, failure",
3488 GNUNET_STATISTICS_update (plugin->env->stats,
3489 "# UDP, total, messages, sent, failure",
3496 LOG (GNUNET_ERROR_TYPE_DEBUG,
3497 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3498 (unsigned int) (udpw->msg_size),
3499 GNUNET_i2s (&udpw->session->target),
3503 (sent < 0) ? STRERROR (errno) : "ok");
3504 GNUNET_STATISTICS_update (plugin->env->stats,
3505 "# UDP, total, bytes, sent, success",
3508 GNUNET_STATISTICS_update (plugin->env->stats,
3509 "# UDP, total, messages, sent, success",
3512 if (NULL != udpw->frag_ctx)
3513 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3514 udpw->qc (udpw->qc_cls,
3518 notify_session_monitor (plugin,
3520 GNUNET_TRANSPORT_SS_UPDATE);
3526 /* ***************** Event loop (part 2) *************** */
3530 * We have been notified that our readset has something to read. We don't
3531 * know which socket needs to be read, so we have to check each one
3532 * Then reschedule this function to be called again once more is available.
3534 * @param cls the plugin handle
3537 udp_plugin_select_v4 (void *cls)
3539 struct Plugin *plugin = cls;
3540 const struct GNUNET_SCHEDULER_TaskContext *tc;
3542 plugin->select_task_v4 = NULL;
3543 if (NULL == plugin->sockv4)
3545 tc = GNUNET_SCHEDULER_get_task_context ();
3546 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3547 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3549 udp_select_read (plugin,
3551 udp_select_send (plugin,
3553 schedule_select_v4 (plugin);
3558 * We have been notified that our readset has something to read. We don't
3559 * know which socket needs to be read, so we have to check each one
3560 * Then reschedule this function to be called again once more is available.
3562 * @param cls the plugin handle
3565 udp_plugin_select_v6 (void *cls)
3567 struct Plugin *plugin = cls;
3568 const struct GNUNET_SCHEDULER_TaskContext *tc;
3570 plugin->select_task_v6 = NULL;
3571 if (NULL == plugin->sockv6)
3573 tc = GNUNET_SCHEDULER_get_task_context ();
3574 if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3575 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3577 udp_select_read (plugin,
3580 udp_select_send (plugin,
3582 schedule_select_v6 (plugin);
3586 /* ******************* Initialization *************** */
3590 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3592 * @param plugin the plugin to initialize
3593 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3594 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3595 * @return number of sockets that were successfully bound
3598 setup_sockets (struct Plugin *plugin,
3599 const struct sockaddr_in6 *bind_v6,
3600 const struct sockaddr_in *bind_v4)
3603 unsigned int sockets_created = 0;
3604 struct sockaddr_in6 server_addrv6;
3605 struct sockaddr_in server_addrv4;
3606 const struct sockaddr *server_addr;
3607 const struct sockaddr *addrs[2];
3608 socklen_t addrlens[2];
3612 /* Create IPv6 socket */
3614 if (GNUNET_YES == plugin->enable_ipv6)
3616 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
3619 if (NULL == plugin->sockv6)
3621 LOG (GNUNET_ERROR_TYPE_INFO,
3622 _("Disabling IPv6 since it is not supported on this system!\n"));
3623 plugin->enable_ipv6 = GNUNET_NO;
3627 memset (&server_addrv6,
3629 sizeof(struct sockaddr_in6));
3630 #if HAVE_SOCKADDR_IN_SIN_LEN
3631 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3633 server_addrv6.sin6_family = AF_INET6;
3634 if (NULL != bind_v6)
3635 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3637 server_addrv6.sin6_addr = in6addr_any;
3639 if (0 == plugin->port) /* autodetect */
3640 server_addrv6.sin6_port
3641 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3645 server_addrv6.sin6_port = htons (plugin->port);
3646 addrlen = sizeof (struct sockaddr_in6);
3647 server_addr = (const struct sockaddr *) &server_addrv6;
3652 LOG(GNUNET_ERROR_TYPE_DEBUG,
3653 "Binding to IPv6 `%s'\n",
3654 GNUNET_a2s (server_addr,
3658 GNUNET_NETWORK_socket_bind (plugin->sockv6,
3663 if (0 != plugin->port)
3665 tries = 10; /* fail immediately */
3666 break; /* bind failed on specific port */
3669 server_addrv6.sin6_port
3670 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3677 GNUNET_NETWORK_socket_close (plugin->sockv6);
3678 plugin->enable_ipv6 = GNUNET_NO;
3679 plugin->sockv6 = NULL;
3683 plugin->port = ntohs (server_addrv6.sin6_port);
3685 if (NULL != plugin->sockv6)
3687 LOG (GNUNET_ERROR_TYPE_DEBUG,
3688 "IPv6 UDP socket created listinging at %s\n",
3689 GNUNET_a2s (server_addr,
3691 addrs[sockets_created] = server_addr;
3692 addrlens[sockets_created] = addrlen;
3697 LOG (GNUNET_ERROR_TYPE_WARNING,
3698 _("Failed to bind UDP socket to %s: %s\n"),
3699 GNUNET_a2s (server_addr,
3706 /* Create IPv4 socket */
3708 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
3711 if (NULL == plugin->sockv4)
3713 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3715 LOG (GNUNET_ERROR_TYPE_INFO,
3716 _("Disabling IPv4 since it is not supported on this system!\n"));
3717 plugin->enable_ipv4 = GNUNET_NO;
3721 memset (&server_addrv4,
3723 sizeof(struct sockaddr_in));
3724 #if HAVE_SOCKADDR_IN_SIN_LEN
3725 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3727 server_addrv4.sin_family = AF_INET;
3728 if (NULL != bind_v4)
3729 server_addrv4.sin_addr = bind_v4->sin_addr;
3731 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3733 if (0 == plugin->port)
3735 server_addrv4.sin_port
3736 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3740 server_addrv4.sin_port = htons (plugin->port);
3742 addrlen = sizeof (struct sockaddr_in);
3743 server_addr = (const struct sockaddr *) &server_addrv4;
3748 LOG (GNUNET_ERROR_TYPE_DEBUG,
3749 "Binding to IPv4 `%s'\n",
3750 GNUNET_a2s (server_addr,
3755 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3760 if (0 != plugin->port)
3762 tries = 10; /* fail */
3763 break; /* bind failed on specific port */
3767 server_addrv4.sin_port
3768 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3775 GNUNET_NETWORK_socket_close (plugin->sockv4);
3776 plugin->enable_ipv4 = GNUNET_NO;
3777 plugin->sockv4 = NULL;
3781 plugin->port = ntohs (server_addrv4.sin_port);
3784 if (NULL != plugin->sockv4)
3786 LOG (GNUNET_ERROR_TYPE_DEBUG,
3787 "IPv4 socket created on port %s\n",
3788 GNUNET_a2s (server_addr,
3790 addrs[sockets_created] = server_addr;
3791 addrlens[sockets_created] = addrlen;
3796 LOG (GNUNET_ERROR_TYPE_ERROR,
3797 _("Failed to bind UDP socket to %s: %s\n"),
3798 GNUNET_a2s (server_addr,
3804 if (0 == sockets_created)
3806 LOG (GNUNET_ERROR_TYPE_WARNING,
3807 _("Failed to open UDP sockets\n"));
3808 return 0; /* No sockets created, return */
3810 schedule_select_v4 (plugin);
3811 schedule_select_v6 (plugin);
3812 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3818 &udp_nat_port_map_callback,
3821 return sockets_created;
3826 * The exported method. Makes the core api available via a global and
3827 * returns the udp transport API.
3829 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3830 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3833 libgnunet_plugin_transport_udp_init (void *cls)
3835 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3836 struct GNUNET_TRANSPORT_PluginFunctions *api;
3838 unsigned long long port;
3839 unsigned long long aport;
3840 unsigned long long udp_max_bps;
3841 unsigned long long enable_v6;
3842 unsigned long long enable_broadcasting;
3843 unsigned long long enable_broadcasting_recv;
3844 char *bind4_address;
3845 char *bind6_address;
3846 struct GNUNET_TIME_Relative interval;
3847 struct sockaddr_in server_addrv4;
3848 struct sockaddr_in6 server_addrv6;
3853 if (NULL == env->receive)
3855 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3856 initialze the plugin or the API */
3857 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3859 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3860 api->address_to_string = &udp_address_to_string;
3861 api->string_to_address = &udp_string_to_address;
3865 /* Get port number: port == 0 : autodetect a port,
3866 * > 0 : use this port, not given : 2086 default */
3868 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3875 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3878 _("must be in [0,65535]"));
3882 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3889 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3892 _("must be in [0,65535]"));
3897 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3900 enable_v6 = GNUNET_NO;
3902 enable_v6 = GNUNET_YES;
3904 have_bind4 = GNUNET_NO;
3905 memset (&server_addrv4,
3907 sizeof (server_addrv4));
3909 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3914 LOG (GNUNET_ERROR_TYPE_DEBUG,
3915 "Binding UDP plugin to specific address: `%s'\n",
3917 if (1 != inet_pton (AF_INET,
3919 &server_addrv4.sin_addr))
3921 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3924 _("must be valid IPv4 address"));
3925 GNUNET_free (bind4_address);
3928 have_bind4 = GNUNET_YES;
3930 GNUNET_free_non_null (bind4_address);
3931 have_bind6 = GNUNET_NO;
3932 memset (&server_addrv6,
3934 sizeof (server_addrv6));
3936 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3941 LOG (GNUNET_ERROR_TYPE_DEBUG,
3942 "Binding udp plugin to specific address: `%s'\n",
3944 if (1 != inet_pton (AF_INET6,
3946 &server_addrv6.sin6_addr))
3948 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3951 _("must be valid IPv6 address"));
3952 GNUNET_free (bind6_address);
3955 have_bind6 = GNUNET_YES;
3957 GNUNET_free_non_null (bind6_address);
3959 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3962 if (enable_broadcasting == GNUNET_SYSERR)
3963 enable_broadcasting = GNUNET_NO;
3965 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3967 "BROADCAST_RECEIVE");
3968 if (enable_broadcasting_recv == GNUNET_SYSERR)
3969 enable_broadcasting_recv = GNUNET_YES;
3971 if (GNUNET_SYSERR ==
3972 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3974 "BROADCAST_INTERVAL",
3977 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
3981 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3986 /* 50 MB/s == infinity for practical purposes */
3987 udp_max_bps = 1024 * 1024 * 50;
3990 p = GNUNET_new (struct Plugin);
3993 p->broadcast_interval = interval;
3994 p->enable_ipv6 = enable_v6;
3995 p->enable_ipv4 = GNUNET_YES; /* default */
3996 p->enable_broadcasting = enable_broadcasting;
3997 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3999 p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
4001 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
4002 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages,
4004 GNUNET_BANDWIDTH_tracker_init (&p->tracker,
4007 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps),
4009 res = setup_sockets (p,
4010 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
4011 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
4013 ( (NULL == p->sockv4) &&
4014 (NULL == p->sockv6) ) )
4016 LOG (GNUNET_ERROR_TYPE_ERROR,
4017 _("Failed to create UDP network sockets\n"));
4018 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
4019 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
4020 GNUNET_SERVER_mst_destroy (p->mst);
4022 GNUNET_NAT_unregister (p->nat);
4027 /* Setup broadcasting and receiving beacons */
4032 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
4034 api->disconnect_session = &udp_disconnect_session;
4035 api->query_keepalive_factor = &udp_query_keepalive_factor;
4036 api->disconnect_peer = &udp_disconnect;
4037 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
4038 api->address_to_string = &udp_address_to_string;
4039 api->string_to_address = &udp_string_to_address;
4040 api->check_address = &udp_plugin_check_address;
4041 api->get_session = &udp_plugin_get_session;
4042 api->send = &udp_plugin_send;
4043 api->get_network = &udp_plugin_get_network;
4044 api->get_network_for_address = &udp_plugin_get_network_for_address;
4045 api->update_session_timeout = &udp_plugin_update_session_timeout;
4046 api->setup_monitor = &udp_plugin_setup_monitor;
4052 * Function called on each entry in the defragmentation heap to
4056 * @param node node in the heap (to be removed)
4057 * @param element a `struct DefragContext` to be cleaned up
4058 * @param cost unused
4059 * @return #GNUNET_YES
4062 heap_cleanup_iterator (void *cls,
4063 struct GNUNET_CONTAINER_HeapNode *node,
4065 GNUNET_CONTAINER_HeapCostType cost)
4067 struct DefragContext *d_ctx = element;
4069 GNUNET_CONTAINER_heap_remove_node (node);
4070 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
4071 GNUNET_free (d_ctx);
4077 * The exported method. Makes the core api available via a global and
4078 * returns the udp transport API.
4080 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
4084 libgnunet_plugin_transport_udp_done (void *cls)
4086 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
4087 struct Plugin *plugin = api->cls;
4088 struct PrettyPrinterContext *cur;
4089 struct UDP_MessageWrapper *udpw;
4096 stop_broadcast (plugin);
4097 if (NULL != plugin->select_task_v4)
4099 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
4100 plugin->select_task_v4 = NULL;
4102 if (NULL != plugin->select_task_v6)
4104 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
4105 plugin->select_task_v6 = NULL;
4107 if (NULL != plugin->sockv4)
4109 GNUNET_break (GNUNET_OK ==
4110 GNUNET_NETWORK_socket_close (plugin->sockv4));
4111 plugin->sockv4 = NULL;
4113 if (NULL != plugin->sockv6)
4115 GNUNET_break (GNUNET_OK ==
4116 GNUNET_NETWORK_socket_close (plugin->sockv6));
4117 plugin->sockv6 = NULL;
4119 if (NULL != plugin->nat)
4121 GNUNET_NAT_unregister (plugin->nat);
4124 if (NULL != plugin->defrag_ctxs)
4126 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
4127 &heap_cleanup_iterator,
4129 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
4130 plugin->defrag_ctxs = NULL;
4132 if (NULL != plugin->mst)
4134 GNUNET_SERVER_mst_destroy (plugin->mst);
4137 while (NULL != (udpw = plugin->ipv4_queue_head))
4141 udpw->qc (udpw->qc_cls,
4146 while (NULL != (udpw = plugin->ipv6_queue_head))
4150 udpw->qc (udpw->qc_cls,
4155 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
4156 &disconnect_and_free_it,
4158 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
4160 while (NULL != (cur = plugin->ppc_dll_head))
4163 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
4164 plugin->ppc_dll_tail,
4166 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
4167 if (NULL != cur->timeout_task)
4169 GNUNET_SCHEDULER_cancel (cur->timeout_task);
4170 cur->timeout_task = NULL;
4174 GNUNET_free (plugin);
4179 /* end of plugin_transport_udp.c */