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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
731 * @param tc the scheduling context (for rescheduling this function again)
734 udp_plugin_select_v4 (void *cls,
735 const struct GNUNET_SCHEDULER_TaskContext *tc);
739 * We have been notified that our readset has something to read. We don't
740 * know which socket needs to be read, so we have to check each one
741 * Then reschedule this function to be called again once more is available.
743 * @param cls the plugin handle
744 * @param tc the scheduling context (for rescheduling this function again)
747 udp_plugin_select_v6 (void *cls,
748 const struct GNUNET_SCHEDULER_TaskContext *tc);
752 * (re)schedule IPv4-select tasks for this plugin.
754 * @param plugin plugin to reschedule
757 schedule_select_v4 (struct Plugin *plugin)
759 struct GNUNET_TIME_Relative min_delay;
760 struct GNUNET_TIME_Relative delay;
761 struct UDP_MessageWrapper *udpw;
762 struct UDP_MessageWrapper *min_udpw;
764 if ( (GNUNET_YES == plugin->enable_ipv4) &&
765 (NULL != plugin->sockv4) )
767 /* Find a message ready to send:
768 * Flow delay from other peer is expired or not set (0) */
769 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
771 for (udpw = plugin->ipv4_queue_head; NULL != udpw; udpw = udpw->next)
773 delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
774 if (delay.rel_value_us < min_delay.rel_value_us)
780 if (NULL != plugin->select_task_v4)
781 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
782 if (NULL != min_udpw)
784 if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
786 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
787 "Calculated flow delay for UDPv4 at %s for %s\n",
788 GNUNET_STRINGS_relative_time_to_string (min_delay,
790 GNUNET_i2s (&min_udpw->session->target));
794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
795 "Calculated flow delay for UDPv4 at %s for %s\n",
796 GNUNET_STRINGS_relative_time_to_string (min_delay,
798 GNUNET_i2s (&min_udpw->session->target));
801 plugin->select_task_v4
802 = GNUNET_SCHEDULER_add_read_net (min_delay,
804 &udp_plugin_select_v4,
811 * (re)schedule IPv6-select tasks for this plugin.
813 * @param plugin plugin to reschedule
816 schedule_select_v6 (struct Plugin *plugin)
818 struct GNUNET_TIME_Relative min_delay;
819 struct GNUNET_TIME_Relative delay;
820 struct UDP_MessageWrapper *udpw;
821 struct UDP_MessageWrapper *min_udpw;
823 if ( (GNUNET_YES == plugin->enable_ipv6) &&
824 (NULL != plugin->sockv6) )
826 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
828 for (udpw = plugin->ipv6_queue_head; NULL != udpw; udpw = udpw->next)
830 delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
831 if (delay.rel_value_us < min_delay.rel_value_us)
837 if (NULL != plugin->select_task_v6)
838 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
839 if (NULL != min_udpw)
841 if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
843 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
844 "Calculated flow delay for UDPv6 at %s for %s\n",
845 GNUNET_STRINGS_relative_time_to_string (min_delay,
847 GNUNET_i2s (&min_udpw->session->target));
851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
852 "Calculated flow delay for UDPv6 at %s for %s\n",
853 GNUNET_STRINGS_relative_time_to_string (min_delay,
855 GNUNET_i2s (&min_udpw->session->target));
858 plugin->select_task_v6
859 = GNUNET_SCHEDULER_add_read_net (min_delay,
861 &udp_plugin_select_v6,
867 /* ******************* Address to string and back ***************** */
871 * Function called for a quick conversion of the binary address to
872 * a numeric address. Note that the caller must not free the
873 * address and that the next call to this function is allowed
874 * to override the address again.
877 * @param addr binary address (a `union UdpAddress`)
878 * @param addrlen length of the @a addr
879 * @return string representing the same address
882 udp_address_to_string (void *cls,
886 static char rbuf[INET6_ADDRSTRLEN + 10];
887 char buf[INET6_ADDRSTRLEN];
891 const struct IPv4UdpAddress *t4;
892 const struct IPv6UdpAddress *t6;
903 if (addrlen == sizeof(struct IPv6UdpAddress))
907 options = ntohl (t6->options);
908 port = ntohs (t6->u6_port);
912 else if (addrlen == sizeof(struct IPv4UdpAddress))
916 options = ntohl (t4->options);
917 port = ntohs (t4->u4_port);
918 a4.s_addr = t4->ipv4_addr;
930 GNUNET_snprintf (rbuf,
944 * Function called to convert a string address to a binary address.
946 * @param cls closure (`struct Plugin *`)
947 * @param addr string address
948 * @param addrlen length of the address
949 * @param buf location to store the buffer
950 * @param added location to store the number of bytes in the buffer.
951 * If the function returns #GNUNET_SYSERR, its contents are undefined.
952 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
955 udp_string_to_address (void *cls,
961 struct sockaddr_storage socket_address;
967 /* Format tcp.options.address:port */
972 if ((NULL == addr) || (0 == addrlen))
975 return GNUNET_SYSERR;
977 if ('\0' != addr[addrlen - 1])
980 return GNUNET_SYSERR;
982 if (strlen (addr) != addrlen - 1)
985 return GNUNET_SYSERR;
987 plugin = GNUNET_strdup (addr);
988 optionstr = strchr (plugin, '.');
989 if (NULL == optionstr)
992 GNUNET_free (plugin);
993 return GNUNET_SYSERR;
997 options = atol (optionstr);
998 address = strchr (optionstr, '.');
1002 GNUNET_free (plugin);
1003 return GNUNET_SYSERR;
1009 GNUNET_STRINGS_to_address_ip (address,
1014 GNUNET_free (plugin);
1015 return GNUNET_SYSERR;
1017 GNUNET_free(plugin);
1019 switch (socket_address.ss_family)
1023 struct IPv4UdpAddress *u4;
1024 const struct sockaddr_in *in4 = (const struct sockaddr_in *) &socket_address;
1026 u4 = GNUNET_new (struct IPv4UdpAddress);
1027 u4->options = htonl (options);
1028 u4->ipv4_addr = in4->sin_addr.s_addr;
1029 u4->u4_port = in4->sin_port;
1031 *added = sizeof (struct IPv4UdpAddress);
1036 struct IPv6UdpAddress *u6;
1037 const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) &socket_address;
1039 u6 = GNUNET_new (struct IPv6UdpAddress);
1040 u6->options = htonl (options);
1041 u6->ipv6_addr = in6->sin6_addr;
1042 u6->u6_port = in6->sin6_port;
1044 *added = sizeof (struct IPv6UdpAddress);
1049 return GNUNET_SYSERR;
1055 * Append our port and forward the result.
1057 * @param cls a `struct PrettyPrinterContext *`
1058 * @param hostname result from DNS resolver
1061 append_port (void *cls,
1062 const char *hostname)
1064 struct PrettyPrinterContext *ppc = cls;
1065 struct Plugin *plugin = ppc->plugin;
1068 if (NULL == hostname)
1070 /* Final call, done */
1071 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
1072 plugin->ppc_dll_tail,
1074 ppc->resolver_handle = NULL;
1075 ppc->asc (ppc->asc_cls,
1081 if (GNUNET_YES == ppc->ipv6)
1082 GNUNET_asprintf (&ret,
1089 GNUNET_asprintf (&ret,
1095 ppc->asc (ppc->asc_cls,
1103 * Convert the transports address to a nice, human-readable format.
1105 * @param cls closure with the `struct Plugin *`
1106 * @param type name of the transport that generated the address
1107 * @param addr one of the addresses of the host, NULL for the last address
1108 * the specific address format depends on the transport;
1109 * a `union UdpAddress`
1110 * @param addrlen length of the address
1111 * @param numeric should (IP) addresses be displayed in numeric form?
1112 * @param timeout after how long should we give up?
1113 * @param asc function to call on each string
1114 * @param asc_cls closure for @a asc
1117 udp_plugin_address_pretty_printer (void *cls,
1122 struct GNUNET_TIME_Relative timeout,
1123 GNUNET_TRANSPORT_AddressStringCallback asc,
1126 struct Plugin *plugin = cls;
1127 struct PrettyPrinterContext *ppc;
1128 const struct sockaddr *sb;
1130 struct sockaddr_in a4;
1131 struct sockaddr_in6 a6;
1132 const struct IPv4UdpAddress *u4;
1133 const struct IPv6UdpAddress *u6;
1137 if (addrlen == sizeof(struct IPv6UdpAddress))
1143 a6.sin6_family = AF_INET6;
1144 #if HAVE_SOCKADDR_IN_SIN_LEN
1145 a6.sin6_len = sizeof (a6);
1147 a6.sin6_port = u6->u6_port;
1148 a6.sin6_addr = u6->ipv6_addr;
1149 port = ntohs (u6->u6_port);
1150 options = ntohl (u6->options);
1151 sb = (const struct sockaddr *) &a6;
1154 else if (addrlen == sizeof (struct IPv4UdpAddress))
1160 a4.sin_family = AF_INET;
1161 #if HAVE_SOCKADDR_IN_SIN_LEN
1162 a4.sin_len = sizeof (a4);
1164 a4.sin_port = u4->u4_port;
1165 a4.sin_addr.s_addr = u4->ipv4_addr;
1166 port = ntohs (u4->u4_port);
1167 options = ntohl (u4->options);
1168 sb = (const struct sockaddr *) &a4;
1173 /* invalid address */
1174 GNUNET_break_op (0);
1183 ppc = GNUNET_new (struct PrettyPrinterContext);
1184 ppc->plugin = plugin;
1186 ppc->asc_cls = asc_cls;
1188 ppc->options = options;
1189 if (addrlen == sizeof (struct IPv6UdpAddress))
1190 ppc->ipv6 = GNUNET_YES;
1192 ppc->ipv6 = GNUNET_NO;
1193 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
1194 plugin->ppc_dll_tail,
1196 ppc->resolver_handle
1197 = GNUNET_RESOLVER_hostname_get (sb,
1207 * Check if the given port is plausible (must be either our listen
1208 * port or our advertised port). If it is neither, we return
1211 * @param plugin global variables
1212 * @param in_port port number to check
1213 * @return #GNUNET_OK if port is either our open or advertised port
1216 check_port (const struct Plugin *plugin,
1219 if ( (plugin->port == in_port) ||
1220 (plugin->aport == in_port) )
1222 return GNUNET_SYSERR;
1227 * Function that will be called to check if a binary address for this
1228 * plugin is well-formed and corresponds to an address for THIS peer
1229 * (as per our configuration). Naturally, if absolutely necessary,
1230 * plugins can be a bit conservative in their answer, but in general
1231 * plugins should make sure that the address does not redirect
1232 * traffic to a 3rd party that might try to man-in-the-middle our
1235 * @param cls closure, should be our handle to the Plugin
1236 * @param addr pointer to a `union UdpAddress`
1237 * @param addrlen length of @a addr
1238 * @return #GNUNET_OK if this is a plausible address for this peer
1239 * and transport, #GNUNET_SYSERR if not
1242 udp_plugin_check_address (void *cls,
1246 struct Plugin *plugin = cls;
1247 const struct IPv4UdpAddress *v4;
1248 const struct IPv6UdpAddress *v6;
1250 if (sizeof(struct IPv4UdpAddress) == addrlen)
1252 v4 = (const struct IPv4UdpAddress *) addr;
1253 if (GNUNET_OK != check_port (plugin,
1254 ntohs (v4->u4_port)))
1255 return GNUNET_SYSERR;
1257 GNUNET_NAT_test_address (plugin->nat,
1259 sizeof (struct in_addr)))
1260 return GNUNET_SYSERR;
1262 else if (sizeof(struct IPv6UdpAddress) == addrlen)
1264 v6 = (const struct IPv6UdpAddress *) addr;
1265 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1267 GNUNET_break_op (0);
1268 return GNUNET_SYSERR;
1270 if (GNUNET_OK != check_port (plugin,
1271 ntohs (v6->u6_port)))
1272 return GNUNET_SYSERR;
1274 GNUNET_NAT_test_address (plugin->nat,
1276 sizeof (struct in6_addr)))
1277 return GNUNET_SYSERR;
1281 GNUNET_break_op (0);
1282 return GNUNET_SYSERR;
1289 * Our external IP address/port mapping has changed.
1291 * @param cls closure, the `struct Plugin`
1292 * @param add_remove #GNUNET_YES to mean the new public IP address,
1293 * #GNUNET_NO to mean the previous (now invalid) one
1294 * @param addr either the previous or the new public IP address
1295 * @param addrlen actual length of the @a addr
1298 udp_nat_port_map_callback (void *cls,
1300 const struct sockaddr *addr,
1303 struct Plugin *plugin = cls;
1304 struct GNUNET_HELLO_Address *address;
1305 struct IPv4UdpAddress u4;
1306 struct IPv6UdpAddress u6;
1310 LOG (GNUNET_ERROR_TYPE_DEBUG,
1311 (GNUNET_YES == add_remove)
1312 ? "NAT notification to add address `%s'\n"
1313 : "NAT notification to remove address `%s'\n",
1316 /* convert 'address' to our internal format */
1317 switch (addr->sa_family)
1321 const struct sockaddr_in *i4;
1323 GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
1324 i4 = (const struct sockaddr_in *) addr;
1325 if (0 == ntohs (i4->sin_port))
1333 u4.options = htonl (plugin->myoptions);
1334 u4.ipv4_addr = i4->sin_addr.s_addr;
1335 u4.u4_port = i4->sin_port;
1337 args = sizeof (struct IPv4UdpAddress);
1342 const struct sockaddr_in6 *i6;
1344 GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
1345 i6 = (const struct sockaddr_in6 *) addr;
1346 if (0 == ntohs (i6->sin6_port))
1354 u6.options = htonl (plugin->myoptions);
1355 u6.ipv6_addr = i6->sin6_addr;
1356 u6.u6_port = i6->sin6_port;
1358 args = sizeof (struct IPv6UdpAddress);
1365 /* modify our published address list */
1366 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1370 GNUNET_HELLO_ADDRESS_INFO_NONE);
1371 plugin->env->notify_address (plugin->env->cls,
1374 GNUNET_HELLO_address_free (address);
1378 /* ********************* Finding sessions ******************* */
1382 * Closure for #session_cmp_it().
1384 struct GNUNET_ATS_SessionCompareContext
1387 * Set to session matching the address.
1389 struct GNUNET_ATS_Session *res;
1392 * Address we are looking for.
1394 const struct GNUNET_HELLO_Address *address;
1399 * Find a session with a matching address.
1401 * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
1402 * @param key peer identity (unused)
1403 * @param value the `struct GNUNET_ATS_Session *`
1404 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1407 session_cmp_it (void *cls,
1408 const struct GNUNET_PeerIdentity *key,
1411 struct GNUNET_ATS_SessionCompareContext *cctx = cls;
1412 struct GNUNET_ATS_Session *s = value;
1414 if (0 == GNUNET_HELLO_address_cmp (s->address,
1417 GNUNET_assert (GNUNET_NO == s->in_destroy);
1426 * Locate an existing session the transport service is using to
1427 * send data to another peer. Performs some basic sanity checks
1428 * on the address and then tries to locate a matching session.
1430 * @param cls the plugin
1431 * @param address the address we should locate the session by
1432 * @return the session if it exists, or NULL if it is not found
1434 static struct GNUNET_ATS_Session *
1435 udp_plugin_lookup_session (void *cls,
1436 const struct GNUNET_HELLO_Address *address)
1438 struct Plugin *plugin = cls;
1439 const struct IPv6UdpAddress *udp_a6;
1440 const struct IPv4UdpAddress *udp_a4;
1441 struct GNUNET_ATS_SessionCompareContext cctx;
1443 if (NULL == address->address)
1448 if (sizeof(struct IPv4UdpAddress) == address->address_length)
1450 if (NULL == plugin->sockv4)
1452 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1453 if (0 == udp_a4->u4_port)
1459 else if (sizeof(struct IPv6UdpAddress) == address->address_length)
1461 if (NULL == plugin->sockv6)
1463 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1464 if (0 == udp_a6->u6_port)
1476 /* check if session already exists */
1477 cctx.address = address;
1479 LOG (GNUNET_ERROR_TYPE_DEBUG,
1480 "Looking for existing session for peer `%s' with address `%s'\n",
1481 GNUNET_i2s (&address->peer),
1482 udp_address_to_string (plugin,
1484 address->address_length));
1485 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1489 if (NULL == cctx.res)
1491 LOG (GNUNET_ERROR_TYPE_DEBUG,
1492 "Found existing session %p\n",
1498 /* ********************** Timeout ****************** */
1502 * Increment session timeout due to activity.
1504 * @param s session to reschedule timeout activity for
1507 reschedule_session_timeout (struct GNUNET_ATS_Session *s)
1509 if (GNUNET_YES == s->in_destroy)
1511 GNUNET_assert (NULL != s->timeout_task);
1512 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1518 * Function that will be called whenever the transport service wants to
1519 * notify the plugin that a session is still active and in use and
1520 * therefore the session timeout for this session has to be updated
1522 * @param cls closure with the `struct Plugin`
1523 * @param peer which peer was the session for
1524 * @param session which session is being updated
1527 udp_plugin_update_session_timeout (void *cls,
1528 const struct GNUNET_PeerIdentity *peer,
1529 struct GNUNET_ATS_Session *session)
1531 struct Plugin *plugin = cls;
1534 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1541 /* Reschedule session timeout */
1542 reschedule_session_timeout (session);
1546 /* ************************* Sending ************************ */
1550 * Remove the given message from the transmission queue and
1551 * update all applicable statistics.
1553 * @param plugin the UDP plugin
1554 * @param udpw message wrapper to dequeue
1557 dequeue (struct Plugin *plugin,
1558 struct UDP_MessageWrapper *udpw)
1560 struct GNUNET_ATS_Session *session = udpw->session;
1562 if (plugin->bytes_in_buffer < udpw->msg_size)
1568 GNUNET_STATISTICS_update (plugin->env->stats,
1569 "# UDP, total bytes in send buffers",
1570 - (long long) udpw->msg_size,
1572 plugin->bytes_in_buffer -= udpw->msg_size;
1574 GNUNET_STATISTICS_update (plugin->env->stats,
1575 "# UDP, total messages in send buffers",
1578 if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length)
1580 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1581 plugin->ipv4_queue_tail,
1584 else if (sizeof(struct IPv6UdpAddress) == udpw->session->address->address_length)
1586 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1587 plugin->ipv6_queue_tail,
1595 GNUNET_assert (session->msgs_in_queue > 0);
1596 session->msgs_in_queue--;
1597 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1598 session->bytes_in_queue -= udpw->msg_size;
1603 * Enqueue a message for transmission and update statistics.
1605 * @param plugin the UDP plugin
1606 * @param udpw message wrapper to queue
1609 enqueue (struct Plugin *plugin,
1610 struct UDP_MessageWrapper *udpw)
1612 struct GNUNET_ATS_Session *session = udpw->session;
1614 if (GNUNET_YES == session->in_destroy)
1619 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1625 GNUNET_STATISTICS_update (plugin->env->stats,
1626 "# UDP, total bytes in send buffers",
1629 plugin->bytes_in_buffer += udpw->msg_size;
1631 GNUNET_STATISTICS_update (plugin->env->stats,
1632 "# UDP, total messages in send buffers",
1635 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
1637 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1638 plugin->ipv4_queue_tail,
1641 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
1643 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1644 plugin->ipv6_queue_tail,
1650 udpw->cont (udpw->cont_cls,
1658 session->msgs_in_queue++;
1659 session->bytes_in_queue += udpw->msg_size;
1664 * We have completed our (attempt) to transmit a message that had to
1665 * be fragmented -- either because we got an ACK saying that all
1666 * fragments were received, or because of timeout / disconnect. Clean
1669 * @param frag_ctx fragmentation context to clean up
1670 * @param result #GNUNET_OK if we succeeded (got ACK),
1671 * #GNUNET_SYSERR if the transmission failed
1674 fragmented_message_done (struct UDP_FragmentationContext *frag_ctx,
1677 struct Plugin *plugin = frag_ctx->plugin;
1678 struct GNUNET_ATS_Session *s = frag_ctx->session;
1679 struct UDP_MessageWrapper *udpw;
1680 struct UDP_MessageWrapper *tmp;
1682 struct GNUNET_TIME_Relative delay;
1684 LOG (GNUNET_ERROR_TYPE_DEBUG,
1685 "%p: Fragmented message removed with result %s\n",
1687 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1688 /* Call continuation for fragmented message */
1689 if (frag_ctx->on_wire_size >= frag_ctx->payload_size)
1690 overhead = frag_ctx->on_wire_size - frag_ctx->payload_size;
1692 overhead = frag_ctx->on_wire_size;
1693 delay = GNUNET_TIME_absolute_get_duration (frag_ctx->start_time);
1694 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1696 LOG (GNUNET_ERROR_TYPE_WARNING,
1697 "Fragmented message acknowledged after %s (expected at %s)\n",
1698 GNUNET_STRINGS_relative_time_to_string (delay,
1700 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1704 LOG (GNUNET_ERROR_TYPE_DEBUG,
1705 "Fragmented message acknowledged after %s (expected at %s)\n",
1706 GNUNET_STRINGS_relative_time_to_string (delay,
1708 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1711 if (NULL != frag_ctx->cont)
1712 frag_ctx->cont (frag_ctx->cont_cls,
1715 s->frag_ctx->payload_size,
1716 frag_ctx->on_wire_size);
1717 GNUNET_STATISTICS_update (plugin->env->stats,
1718 "# UDP, fragmented messages active",
1722 if (GNUNET_OK == result)
1724 GNUNET_STATISTICS_update (plugin->env->stats,
1725 "# UDP, fragmented msgs, messages, sent, success",
1728 GNUNET_STATISTICS_update (plugin->env->stats,
1729 "# UDP, fragmented msgs, bytes payload, sent, success",
1730 s->frag_ctx->payload_size,
1732 GNUNET_STATISTICS_update (plugin->env->stats,
1733 "# UDP, fragmented msgs, bytes overhead, sent, success",
1736 GNUNET_STATISTICS_update (plugin->env->stats,
1737 "# UDP, total, bytes overhead, sent",
1740 GNUNET_STATISTICS_update (plugin->env->stats,
1741 "# UDP, total, bytes payload, sent",
1742 s->frag_ctx->payload_size,
1747 GNUNET_STATISTICS_update (plugin->env->stats,
1748 "# UDP, fragmented msgs, messages, sent, failure",
1751 GNUNET_STATISTICS_update (plugin->env->stats,
1752 "# UDP, fragmented msgs, bytes payload, sent, failure",
1753 s->frag_ctx->payload_size,
1755 GNUNET_STATISTICS_update (plugin->env->stats,
1756 "# UDP, fragmented msgs, bytes payload, sent, failure",
1759 GNUNET_STATISTICS_update (plugin->env->stats,
1760 "# UDP, fragmented msgs, bytes payload, sent, failure",
1765 /* Remove remaining fragments from queue, no need to transmit those
1767 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1769 udpw = plugin->ipv6_queue_head;
1770 while (NULL != udpw)
1773 if ( (udpw->frag_ctx != NULL) &&
1774 (udpw->frag_ctx == frag_ctx) )
1783 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1785 udpw = plugin->ipv4_queue_head;
1786 while (NULL != udpw)
1789 if ( (NULL != udpw->frag_ctx) &&
1790 (udpw->frag_ctx == frag_ctx) )
1799 notify_session_monitor (s->plugin,
1801 GNUNET_TRANSPORT_SS_UPDATE);
1802 GNUNET_FRAGMENT_context_destroy (frag_ctx->frag,
1803 &s->last_expected_msg_delay,
1804 &s->last_expected_ack_delay);
1806 GNUNET_free (frag_ctx);
1811 * We are finished with a fragment in the message queue.
1812 * Notify the continuation and update statistics.
1814 * @param cls the `struct Plugin *`
1815 * @param udpw the queue entry
1816 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1819 qc_fragment_sent (void *cls,
1820 struct UDP_MessageWrapper *udpw,
1823 struct Plugin *plugin = cls;
1825 GNUNET_assert (NULL != udpw->frag_ctx);
1826 if (GNUNET_OK == result)
1828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1829 "Fragment of message with %u bytes transmitted to %s\n",
1830 (unsigned int) udpw->payload_size,
1831 GNUNET_i2s (&udpw->session->target));
1832 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1833 GNUNET_STATISTICS_update (plugin->env->stats,
1834 "# UDP, fragmented msgs, fragments, sent, success",
1837 GNUNET_STATISTICS_update (plugin->env->stats,
1838 "# UDP, fragmented msgs, fragments bytes, sent, success",
1844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1845 "Failed to transmit fragment of message with %u bytes to %s\n",
1846 (unsigned int) udpw->payload_size,
1847 GNUNET_i2s (&udpw->session->target));
1848 fragmented_message_done (udpw->frag_ctx,
1850 GNUNET_STATISTICS_update (plugin->env->stats,
1851 "# UDP, fragmented msgs, fragments, sent, failure",
1854 GNUNET_STATISTICS_update (plugin->env->stats,
1855 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1863 * Function that is called with messages created by the fragmentation
1864 * module. In the case of the `proc` callback of the
1865 * #GNUNET_FRAGMENT_context_create() function, this function must
1866 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1868 * @param cls closure, the `struct UDP_FragmentationContext`
1869 * @param msg the message that was created
1872 enqueue_fragment (void *cls,
1873 const struct GNUNET_MessageHeader *msg)
1875 struct UDP_FragmentationContext *frag_ctx = cls;
1876 struct Plugin *plugin = frag_ctx->plugin;
1877 struct UDP_MessageWrapper *udpw;
1878 struct GNUNET_ATS_Session *session = frag_ctx->session;
1879 size_t msg_len = ntohs (msg->size);
1881 LOG (GNUNET_ERROR_TYPE_DEBUG,
1882 "Enqueuing fragment with %u bytes\n",
1884 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1885 udpw->session = session;
1886 udpw->msg_buf = (char *) &udpw[1];
1887 udpw->msg_size = msg_len;
1888 udpw->payload_size = msg_len; /* FIXME: minus fragment overhead */
1889 udpw->timeout = frag_ctx->timeout;
1890 udpw->start_time = frag_ctx->start_time;
1891 udpw->transmission_time = frag_ctx->next_frag_time;
1892 frag_ctx->next_frag_time
1893 = GNUNET_TIME_absolute_add (frag_ctx->next_frag_time,
1894 frag_ctx->flow_delay_from_other_peer);
1895 udpw->frag_ctx = frag_ctx;
1896 udpw->qc = &qc_fragment_sent;
1897 udpw->qc_cls = plugin;
1898 memcpy (udpw->msg_buf,
1903 if (session->address->address_length == sizeof (struct IPv4UdpAddress))
1904 schedule_select_v4 (plugin);
1906 schedule_select_v6 (plugin);
1911 * We are finished with a message from the message queue.
1912 * Notify the continuation and update statistics.
1914 * @param cls the `struct Plugin *`
1915 * @param udpw the queue entry
1916 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1919 qc_message_sent (void *cls,
1920 struct UDP_MessageWrapper *udpw,
1923 struct Plugin *plugin = cls;
1925 struct GNUNET_TIME_Relative delay;
1927 if (udpw->msg_size >= udpw->payload_size)
1928 overhead = udpw->msg_size - udpw->payload_size;
1930 overhead = udpw->msg_size;
1932 if (NULL != udpw->cont)
1934 delay = GNUNET_TIME_absolute_get_duration (udpw->start_time);
1935 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1937 LOG (GNUNET_ERROR_TYPE_WARNING,
1938 "Message sent via UDP with delay of %s\n",
1939 GNUNET_STRINGS_relative_time_to_string (delay,
1944 LOG (GNUNET_ERROR_TYPE_DEBUG,
1945 "Message sent via UDP with delay of %s\n",
1946 GNUNET_STRINGS_relative_time_to_string (delay,
1949 udpw->cont (udpw->cont_cls,
1950 &udpw->session->target,
1955 if (GNUNET_OK == result)
1957 GNUNET_STATISTICS_update (plugin->env->stats,
1958 "# UDP, unfragmented msgs, messages, sent, success",
1961 GNUNET_STATISTICS_update (plugin->env->stats,
1962 "# UDP, unfragmented msgs, bytes payload, sent, success",
1965 GNUNET_STATISTICS_update (plugin->env->stats,
1966 "# UDP, unfragmented msgs, bytes overhead, sent, success",
1969 GNUNET_STATISTICS_update (plugin->env->stats,
1970 "# UDP, total, bytes overhead, sent",
1973 GNUNET_STATISTICS_update (plugin->env->stats,
1974 "# UDP, total, bytes payload, sent",
1980 GNUNET_STATISTICS_update (plugin->env->stats,
1981 "# UDP, unfragmented msgs, messages, sent, failure",
1984 GNUNET_STATISTICS_update (plugin->env->stats,
1985 "# UDP, unfragmented msgs, bytes payload, sent, failure",
1988 GNUNET_STATISTICS_update (plugin->env->stats,
1989 "# UDP, unfragmented msgs, bytes overhead, sent, failure",
1997 * Function that can be used by the transport service to transmit a
1998 * message using the plugin. Note that in the case of a peer
1999 * disconnecting, the continuation MUST be called prior to the
2000 * disconnect notification itself. This function will be called with
2001 * this peer's HELLO message to initiate a fresh connection to another
2004 * @param cls closure
2005 * @param s which session must be used
2006 * @param msgbuf the message to transmit
2007 * @param msgbuf_size number of bytes in @a msgbuf
2008 * @param priority how important is the message (most plugins will
2009 * ignore message priority and just FIFO)
2010 * @param to how long to wait at most for the transmission (does not
2011 * require plugins to discard the message after the timeout,
2012 * just advisory for the desired delay; most plugins will ignore
2014 * @param cont continuation to call once the message has
2015 * been transmitted (or if the transport is ready
2016 * for the next transmission call; or if the
2017 * peer disconnected...); can be NULL
2018 * @param cont_cls closure for @a cont
2019 * @return number of bytes used (on the physical network, with overheads);
2020 * -1 on hard errors (i.e. address invalid); 0 is a legal value
2021 * and does NOT mean that the message was not transmitted (DV)
2024 udp_plugin_send (void *cls,
2025 struct GNUNET_ATS_Session *s,
2028 unsigned int priority,
2029 struct GNUNET_TIME_Relative to,
2030 GNUNET_TRANSPORT_TransmitContinuation cont,
2033 struct Plugin *plugin = cls;
2034 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2035 struct UDP_FragmentationContext *frag_ctx;
2036 struct UDP_MessageWrapper *udpw;
2037 struct UDPMessage *udp;
2038 char mbuf[udpmlen] GNUNET_ALIGN;
2039 struct GNUNET_TIME_Relative latency;
2041 if ( (sizeof(struct IPv6UdpAddress) == s->address->address_length) &&
2042 (NULL == plugin->sockv6) )
2043 return GNUNET_SYSERR;
2044 if ( (sizeof(struct IPv4UdpAddress) == s->address->address_length) &&
2045 (NULL == plugin->sockv4) )
2046 return GNUNET_SYSERR;
2047 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2050 return GNUNET_SYSERR;
2053 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2058 return GNUNET_SYSERR;
2060 LOG (GNUNET_ERROR_TYPE_DEBUG,
2061 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2063 GNUNET_i2s (&s->target),
2064 udp_address_to_string (plugin,
2065 s->address->address,
2066 s->address->address_length));
2068 udp = (struct UDPMessage *) mbuf;
2069 udp->header.size = htons (udpmlen);
2070 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2071 udp->reserved = htonl (0);
2072 udp->sender = *plugin->env->my_identity;
2074 /* We do not update the session time out here! Otherwise this
2075 * session will not timeout since we send keep alive before session
2078 * For UDP we update session timeout only on receive, this will
2079 * cover keep alives, since remote peer will reply with keep alive
2082 if (udpmlen <= UDP_MTU)
2084 /* unfragmented message */
2085 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2087 udpw->msg_buf = (char *) &udpw[1];
2088 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2089 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2090 udpw->start_time = GNUNET_TIME_absolute_get ();
2091 udpw->timeout = GNUNET_TIME_relative_to_absolute (to);
2092 udpw->transmission_time = s->last_transmit_time;
2093 s->last_transmit_time
2094 = GNUNET_TIME_absolute_add (s->last_transmit_time,
2095 s->flow_delay_from_other_peer);
2097 udpw->cont_cls = cont_cls;
2098 udpw->frag_ctx = NULL;
2099 udpw->qc = &qc_message_sent;
2100 udpw->qc_cls = plugin;
2101 memcpy (udpw->msg_buf,
2103 sizeof (struct UDPMessage));
2104 memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)],
2109 GNUNET_STATISTICS_update (plugin->env->stats,
2110 "# UDP, unfragmented messages queued total",
2113 GNUNET_STATISTICS_update (plugin->env->stats,
2114 "# UDP, unfragmented bytes payload queued total",
2117 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2118 schedule_select_v4 (plugin);
2120 schedule_select_v6 (plugin);
2124 /* fragmented message */
2125 if (NULL != s->frag_ctx)
2126 return GNUNET_SYSERR;
2130 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2131 frag_ctx->plugin = plugin;
2132 frag_ctx->session = s;
2133 frag_ctx->cont = cont;
2134 frag_ctx->cont_cls = cont_cls;
2135 frag_ctx->start_time = GNUNET_TIME_absolute_get ();
2136 frag_ctx->next_frag_time = s->last_transmit_time;
2137 frag_ctx->flow_delay_from_other_peer
2138 = GNUNET_TIME_relative_divide (s->flow_delay_from_other_peer,
2141 frag_ctx->timeout = GNUNET_TIME_relative_to_absolute (to);
2142 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2143 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2144 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2147 s->last_expected_msg_delay,
2148 s->last_expected_ack_delay,
2152 s->frag_ctx = frag_ctx;
2153 s->last_transmit_time = frag_ctx->next_frag_time;
2154 latency = GNUNET_TIME_absolute_get_remaining (s->last_transmit_time);
2155 if (latency.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2156 LOG (GNUNET_ERROR_TYPE_WARNING,
2157 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2158 GNUNET_STRINGS_relative_time_to_string (latency,
2160 GNUNET_i2s (&s->target),
2161 (unsigned int) s->msgs_in_queue);
2163 LOG (GNUNET_ERROR_TYPE_DEBUG,
2164 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2165 GNUNET_STRINGS_relative_time_to_string (latency,
2167 GNUNET_i2s (&s->target),
2168 (unsigned int) s->msgs_in_queue);
2170 GNUNET_STATISTICS_update (plugin->env->stats,
2171 "# UDP, fragmented messages active",
2174 GNUNET_STATISTICS_update (plugin->env->stats,
2175 "# UDP, fragmented messages, total",
2178 GNUNET_STATISTICS_update (plugin->env->stats,
2179 "# UDP, fragmented bytes (payload)",
2180 frag_ctx->payload_size,
2183 notify_session_monitor (s->plugin,
2185 GNUNET_TRANSPORT_SS_UPDATE);
2190 /* ********************** Receiving ********************** */
2194 * Closure for #find_receive_context().
2196 struct FindReceiveContext
2199 * Where to store the result.
2201 struct DefragContext *rc;
2204 * Session associated with this context.
2206 struct GNUNET_ATS_Session *session;
2211 const union UdpAddress *udp_addr;
2214 * Number of bytes in @e udp_addr.
2216 size_t udp_addr_len;
2222 * Scan the heap for a receive context with the given address.
2224 * @param cls the `struct FindReceiveContext`
2225 * @param node internal node of the heap
2226 * @param element value stored at the node (a `struct ReceiveContext`)
2227 * @param cost cost associated with the node
2228 * @return #GNUNET_YES if we should continue to iterate,
2229 * #GNUNET_NO if not.
2232 find_receive_context (void *cls,
2233 struct GNUNET_CONTAINER_HeapNode *node,
2235 GNUNET_CONTAINER_HeapCostType cost)
2237 struct FindReceiveContext *frc = cls;
2238 struct DefragContext *e = element;
2240 if ( (frc->udp_addr_len == e->udp_addr_len) &&
2241 (0 == memcmp (frc->udp_addr,
2243 frc->udp_addr_len)) )
2253 * Functions with this signature are called whenever we need to close
2254 * a session due to a disconnect or failure to establish a connection.
2256 * @param cls closure with the `struct Plugin`
2257 * @param s session to close down
2258 * @return #GNUNET_OK on success
2261 udp_disconnect_session (void *cls,
2262 struct GNUNET_ATS_Session *s)
2264 struct Plugin *plugin = cls;
2265 struct UDP_MessageWrapper *udpw;
2266 struct UDP_MessageWrapper *next;
2267 struct FindReceiveContext frc;
2269 GNUNET_assert (GNUNET_YES != s->in_destroy);
2270 LOG (GNUNET_ERROR_TYPE_DEBUG,
2271 "Session %p to peer `%s' at address %s ended\n",
2273 GNUNET_i2s (&s->target),
2274 udp_address_to_string (plugin,
2275 s->address->address,
2276 s->address->address_length));
2277 if (NULL != s->timeout_task)
2279 GNUNET_SCHEDULER_cancel (s->timeout_task);
2280 s->timeout_task = NULL;
2282 if (NULL != s->frag_ctx)
2284 /* Remove fragmented message due to disconnect */
2285 fragmented_message_done (s->frag_ctx,
2288 GNUNET_assert (GNUNET_YES ==
2289 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
2293 frc.udp_addr = s->address->address;
2294 frc.udp_addr_len = s->address->address_length;
2295 /* Lookup existing receive context for this address */
2296 if (NULL != plugin->defrag_ctxs)
2298 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2299 &find_receive_context,
2303 struct DefragContext *d_ctx = frc.rc;
2305 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
2306 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2307 GNUNET_free (d_ctx);
2310 s->in_destroy = GNUNET_YES;
2311 next = plugin->ipv4_queue_head;
2312 while (NULL != (udpw = next))
2315 if (udpw->session == s)
2319 udpw->qc (udpw->qc_cls,
2325 next = plugin->ipv6_queue_head;
2326 while (NULL != (udpw = next))
2329 if (udpw->session == s)
2333 udpw->qc (udpw->qc_cls,
2339 if ( (NULL != s->frag_ctx) &&
2340 (NULL != s->frag_ctx->cont) )
2342 /* The 'frag_ctx' itself will be freed in #free_session() a bit
2343 later, as it might be in use right now */
2344 LOG (GNUNET_ERROR_TYPE_DEBUG,
2345 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
2346 GNUNET_i2s (&s->target));
2347 s->frag_ctx->cont (s->frag_ctx->cont_cls,
2350 s->frag_ctx->payload_size,
2351 s->frag_ctx->on_wire_size);
2353 notify_session_monitor (s->plugin,
2355 GNUNET_TRANSPORT_SS_DONE);
2356 plugin->env->session_end (plugin->env->cls,
2359 GNUNET_STATISTICS_set (plugin->env->stats,
2360 "# UDP sessions active",
2361 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2370 * Handle a #GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK message.
2372 * @param plugin the UDP plugin
2373 * @param msg the (presumed) UDP ACK message
2374 * @param udp_addr sender address
2375 * @param udp_addr_len number of bytes in @a udp_addr
2378 read_process_ack (struct Plugin *plugin,
2379 const struct GNUNET_MessageHeader *msg,
2380 const union UdpAddress *udp_addr,
2381 socklen_t udp_addr_len)
2383 const struct GNUNET_MessageHeader *ack;
2384 const struct UDP_ACK_Message *udp_ack;
2385 struct GNUNET_HELLO_Address *address;
2386 struct GNUNET_ATS_Session *s;
2387 struct GNUNET_TIME_Relative flow_delay;
2389 /* check message format */
2390 if (ntohs (msg->size)
2391 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2393 GNUNET_break_op (0);
2396 udp_ack = (const struct UDP_ACK_Message *) msg;
2397 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2398 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2404 /* Locate session */
2405 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2409 GNUNET_HELLO_ADDRESS_INFO_NONE);
2410 s = udp_plugin_lookup_session (plugin,
2414 LOG (GNUNET_ERROR_TYPE_WARNING,
2415 "UDP session of address %s for ACK not found\n",
2416 udp_address_to_string (plugin,
2418 address->address_length));
2419 GNUNET_HELLO_address_free (address);
2422 if (NULL == s->frag_ctx)
2424 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2425 "Fragmentation context of address %s for ACK (%s) not found\n",
2426 udp_address_to_string (plugin,
2428 address->address_length),
2429 GNUNET_FRAGMENT_print_ack (ack));
2430 GNUNET_HELLO_address_free (address);
2433 GNUNET_HELLO_address_free (address);
2435 /* evaluate flow delay: how long should we wait between messages? */
2436 if (UINT32_MAX == ntohl (udp_ack->delay))
2438 /* Other peer asked for us to terminate the session */
2439 LOG (GNUNET_ERROR_TYPE_INFO,
2440 "Asked to disconnect UDP session of %s\n",
2441 GNUNET_i2s (&udp_ack->sender));
2442 udp_disconnect_session (plugin,
2446 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2447 if (flow_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2448 LOG (GNUNET_ERROR_TYPE_WARNING,
2449 "We received a sending delay of %s for %s\n",
2450 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2452 GNUNET_i2s (&udp_ack->sender));
2454 LOG (GNUNET_ERROR_TYPE_DEBUG,
2455 "We received a sending delay of %s for %s\n",
2456 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2458 GNUNET_i2s (&udp_ack->sender));
2459 /* Flow delay is for the reassembled packet, however, our delay
2460 is per packet, so we need to adjust: */
2461 s->flow_delay_from_other_peer = flow_delay;
2465 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2468 LOG (GNUNET_ERROR_TYPE_DEBUG,
2469 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2470 (unsigned int) ntohs (msg->size),
2471 GNUNET_i2s (&udp_ack->sender),
2472 udp_address_to_string (plugin,
2475 /* Expect more ACKs to arrive */
2479 /* Remove fragmented message after successful sending */
2480 LOG (GNUNET_ERROR_TYPE_DEBUG,
2481 "Message from %s at %s full ACK'ed\n",
2482 GNUNET_i2s (&udp_ack->sender),
2483 udp_address_to_string (plugin,
2486 fragmented_message_done (s->frag_ctx,
2492 * Message tokenizer has broken up an incomming message. Pass it on
2495 * @param cls the `struct Plugin *`
2496 * @param client the `struct GNUNET_ATS_Session *`
2497 * @param hdr the actual message
2498 * @return #GNUNET_OK (always)
2501 process_inbound_tokenized_messages (void *cls,
2503 const struct GNUNET_MessageHeader *hdr)
2505 struct Plugin *plugin = cls;
2506 struct GNUNET_ATS_Session *session = client;
2508 if (GNUNET_YES == session->in_destroy)
2510 reschedule_session_timeout (session);
2511 session->flow_delay_for_other_peer
2512 = plugin->env->receive (plugin->env->cls,
2521 * Destroy a session, plugin is being unloaded.
2523 * @param cls the `struct Plugin`
2524 * @param key hash of public key of target peer
2525 * @param value a `struct PeerSession *` to clean up
2526 * @return #GNUNET_OK (continue to iterate)
2529 disconnect_and_free_it (void *cls,
2530 const struct GNUNET_PeerIdentity *key,
2533 struct Plugin *plugin = cls;
2535 udp_disconnect_session (plugin,
2542 * Disconnect from a remote node. Clean up session if we have one for
2545 * @param cls closure for this call (should be handle to Plugin)
2546 * @param target the peeridentity of the peer to disconnect
2547 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
2550 udp_disconnect (void *cls,
2551 const struct GNUNET_PeerIdentity *target)
2553 struct Plugin *plugin = cls;
2555 LOG (GNUNET_ERROR_TYPE_DEBUG,
2556 "Disconnecting from peer `%s'\n",
2557 GNUNET_i2s (target));
2558 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
2560 &disconnect_and_free_it,
2566 * Session was idle, so disconnect it.
2568 * @param cls the `struct GNUNET_ATS_Session` to time out
2569 * @param tc scheduler context
2572 session_timeout (void *cls,
2573 const struct GNUNET_SCHEDULER_TaskContext *tc)
2575 struct GNUNET_ATS_Session *s = cls;
2576 struct Plugin *plugin = s->plugin;
2577 struct GNUNET_TIME_Relative left;
2579 s->timeout_task = NULL;
2580 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
2581 if (left.rel_value_us > 0)
2583 /* not actually our turn yet, but let's at least update
2584 the monitor, it may think we're about to die ... */
2585 notify_session_monitor (s->plugin,
2587 GNUNET_TRANSPORT_SS_UPDATE);
2588 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
2593 LOG (GNUNET_ERROR_TYPE_DEBUG,
2594 "Session %p was idle for %s, disconnecting\n",
2596 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
2598 /* call session destroy function */
2599 udp_disconnect_session (plugin,
2605 * Allocate a new session for the given endpoint address.
2606 * Note that this function does not inform the service
2607 * of the new session, this is the responsibility of the
2608 * caller (if needed).
2610 * @param cls the `struct Plugin`
2611 * @param address address of the other peer to use
2612 * @param network_type network type the address belongs to
2613 * @return NULL on error, otherwise session handle
2615 static struct GNUNET_ATS_Session *
2616 udp_plugin_create_session (void *cls,
2617 const struct GNUNET_HELLO_Address *address,
2618 enum GNUNET_ATS_Network_Type network_type)
2620 struct Plugin *plugin = cls;
2621 struct GNUNET_ATS_Session *s;
2623 s = GNUNET_new (struct GNUNET_ATS_Session);
2625 s->address = GNUNET_HELLO_address_copy (address);
2626 s->target = address->peer;
2627 s->last_transmit_time = GNUNET_TIME_absolute_get ();
2628 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2630 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
2631 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
2632 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
2633 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
2634 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
2637 s->scope = network_type;
2639 LOG (GNUNET_ERROR_TYPE_DEBUG,
2640 "Creating new session %p for peer `%s' address `%s'\n",
2642 GNUNET_i2s (&address->peer),
2643 udp_address_to_string (plugin,
2645 address->address_length));
2646 GNUNET_assert (GNUNET_OK ==
2647 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
2650 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
2651 GNUNET_STATISTICS_set (plugin->env->stats,
2652 "# UDP sessions active",
2653 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2655 notify_session_monitor (plugin,
2657 GNUNET_TRANSPORT_SS_INIT);
2663 * Creates a new outbound session the transport service will use to
2664 * send data to the peer.
2666 * @param cls the `struct Plugin *`
2667 * @param address the address
2668 * @return the session or NULL of max connections exceeded
2670 static struct GNUNET_ATS_Session *
2671 udp_plugin_get_session (void *cls,
2672 const struct GNUNET_HELLO_Address *address)
2674 struct Plugin *plugin = cls;
2675 struct GNUNET_ATS_Session *s;
2676 enum GNUNET_ATS_Network_Type network_type = GNUNET_ATS_NET_UNSPECIFIED;
2677 const struct IPv4UdpAddress *udp_v4;
2678 const struct IPv6UdpAddress *udp_v6;
2680 if (NULL == address)
2685 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
2686 (address->address_length != sizeof(struct IPv6UdpAddress)) )
2688 GNUNET_break_op (0);
2691 if (NULL != (s = udp_plugin_lookup_session (cls,
2695 /* need to create new session */
2696 if (sizeof (struct IPv4UdpAddress) == address->address_length)
2698 struct sockaddr_in v4;
2700 udp_v4 = (const struct IPv4UdpAddress *) address->address;
2701 memset (&v4, '\0', sizeof (v4));
2702 v4.sin_family = AF_INET;
2703 #if HAVE_SOCKADDR_IN_SIN_LEN
2704 v4.sin_len = sizeof (struct sockaddr_in);
2706 v4.sin_port = udp_v4->u4_port;
2707 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
2708 network_type = plugin->env->get_address_type (plugin->env->cls,
2709 (const struct sockaddr *) &v4,
2712 if (sizeof (struct IPv6UdpAddress) == address->address_length)
2714 struct sockaddr_in6 v6;
2716 udp_v6 = (const struct IPv6UdpAddress *) address->address;
2717 memset (&v6, '\0', sizeof (v6));
2718 v6.sin6_family = AF_INET6;
2719 #if HAVE_SOCKADDR_IN_SIN_LEN
2720 v6.sin6_len = sizeof (struct sockaddr_in6);
2722 v6.sin6_port = udp_v6->u6_port;
2723 v6.sin6_addr = udp_v6->ipv6_addr;
2724 network_type = plugin->env->get_address_type (plugin->env->cls,
2725 (const struct sockaddr *) &v6,
2728 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2729 return udp_plugin_create_session (cls,
2736 * We've received a UDP Message. Process it (pass contents to main service).
2738 * @param plugin plugin context
2739 * @param msg the message
2740 * @param udp_addr sender address
2741 * @param udp_addr_len number of bytes in @a udp_addr
2742 * @param network_type network type the address belongs to
2745 process_udp_message (struct Plugin *plugin,
2746 const struct UDPMessage *msg,
2747 const union UdpAddress *udp_addr,
2748 size_t udp_addr_len,
2749 enum GNUNET_ATS_Network_Type network_type)
2751 struct GNUNET_ATS_Session *s;
2752 struct GNUNET_HELLO_Address *address;
2754 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2755 if (0 != ntohl (msg->reserved))
2760 if (ntohs (msg->header.size)
2761 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2767 address = GNUNET_HELLO_address_allocate (&msg->sender,
2771 GNUNET_HELLO_ADDRESS_INFO_NONE);
2773 (s = udp_plugin_lookup_session (plugin,
2776 s = udp_plugin_create_session (plugin,
2779 plugin->env->session_start (plugin->env->cls,
2783 notify_session_monitor (plugin,
2785 GNUNET_TRANSPORT_SS_UP);
2787 GNUNET_free (address);
2790 GNUNET_SERVER_mst_receive (plugin->mst,
2792 (const char *) &msg[1],
2793 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2797 if ( (0 == s->rc) &&
2798 (GNUNET_YES == s->in_destroy) )
2804 * Process a defragmented message.
2806 * @param cls the `struct DefragContext *`
2807 * @param msg the message
2810 fragment_msg_proc (void *cls,
2811 const struct GNUNET_MessageHeader *msg)
2813 struct DefragContext *dc = cls;
2814 const struct UDPMessage *um;
2816 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2818 GNUNET_break_op (0);
2821 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2823 GNUNET_break_op (0);
2826 um = (const struct UDPMessage *) msg;
2827 dc->sender = um->sender;
2828 dc->have_sender = GNUNET_YES;
2829 process_udp_message (dc->plugin,
2838 * We finished sending an acknowledgement. Update
2841 * @param cls the `struct Plugin`
2842 * @param udpw message queue entry of the ACK
2843 * @param result #GNUNET_OK if the transmission worked,
2844 * #GNUNET_SYSERR if we failed to send the ACK
2847 ack_message_sent (void *cls,
2848 struct UDP_MessageWrapper *udpw,
2851 struct Plugin *plugin = cls;
2853 if (GNUNET_OK == result)
2855 GNUNET_STATISTICS_update (plugin->env->stats,
2856 "# UDP, ACK messages sent",
2862 GNUNET_STATISTICS_update (plugin->env->stats,
2863 "# UDP, ACK transmissions failed",
2871 * Transmit an acknowledgement.
2873 * @param cls the `struct DefragContext *`
2874 * @param id message ID (unused)
2875 * @param msg ack to transmit
2878 ack_proc (void *cls,
2880 const struct GNUNET_MessageHeader *msg)
2882 struct DefragContext *rc = cls;
2883 struct Plugin *plugin = rc->plugin;
2884 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2885 struct UDP_ACK_Message *udp_ack;
2887 struct UDP_MessageWrapper *udpw;
2888 struct GNUNET_ATS_Session *s;
2889 struct GNUNET_HELLO_Address *address;
2891 if (GNUNET_NO == rc->have_sender)
2893 /* tried to defragment but never succeeded, hence will not ACK */
2894 /* This can happen if we just lost msgs */
2895 GNUNET_STATISTICS_update (plugin->env->stats,
2896 "# UDP, fragments discarded without ACK",
2901 address = GNUNET_HELLO_address_allocate (&rc->sender,
2905 GNUNET_HELLO_ADDRESS_INFO_NONE);
2906 s = udp_plugin_lookup_session (plugin,
2908 GNUNET_HELLO_address_free (address);
2911 LOG (GNUNET_ERROR_TYPE_ERROR,
2912 "Trying to transmit ACK to peer `%s' but no session found!\n",
2913 udp_address_to_string (plugin,
2916 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2917 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2919 GNUNET_STATISTICS_update (plugin->env->stats,
2920 "# UDP, ACK transmissions failed",
2925 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
2926 s->flow_delay_for_other_peer.rel_value_us)
2928 else if (s->flow_delay_for_other_peer.rel_value_us < UINT32_MAX)
2929 delay = s->flow_delay_for_other_peer.rel_value_us;
2931 delay = UINT32_MAX - 1; /* largest value we can communicate */
2932 LOG (GNUNET_ERROR_TYPE_DEBUG,
2933 "Sending ACK to `%s' including delay of %s\n",
2934 udp_address_to_string (plugin,
2937 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2939 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2940 udpw->msg_size = msize;
2941 udpw->payload_size = 0;
2943 udpw->start_time = GNUNET_TIME_absolute_get ();
2944 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2945 udpw->msg_buf = (char *) &udpw[1];
2946 udpw->qc = &ack_message_sent;
2947 udpw->qc_cls = plugin;
2948 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2949 udp_ack->header.size = htons ((uint16_t) msize);
2950 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2951 udp_ack->delay = htonl (delay);
2952 udp_ack->sender = *plugin->env->my_identity;
2953 memcpy (&udp_ack[1],
2958 notify_session_monitor (plugin,
2960 GNUNET_TRANSPORT_SS_UPDATE);
2961 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2962 schedule_select_v4 (plugin);
2964 schedule_select_v6 (plugin);
2969 * We received a fragment, process it.
2971 * @param plugin our plugin
2972 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2973 * @param udp_addr sender address
2974 * @param udp_addr_len number of bytes in @a udp_addr
2975 * @param network_type network type the address belongs to
2978 read_process_fragment (struct Plugin *plugin,
2979 const struct GNUNET_MessageHeader *msg,
2980 const union UdpAddress *udp_addr,
2981 size_t udp_addr_len,
2982 enum GNUNET_ATS_Network_Type network_type)
2984 struct DefragContext *d_ctx;
2985 struct GNUNET_TIME_Absolute now;
2986 struct FindReceiveContext frc;
2989 frc.udp_addr = udp_addr;
2990 frc.udp_addr_len = udp_addr_len;
2992 /* Lookup existing receive context for this address */
2993 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2994 &find_receive_context,
2996 now = GNUNET_TIME_absolute_get ();
3001 /* Create a new defragmentation context */
3002 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
3006 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
3007 d_ctx->udp_addr_len = udp_addr_len;
3008 d_ctx->network_type = network_type;
3009 d_ctx->plugin = plugin;
3010 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
3012 UDP_MAX_MESSAGES_IN_DEFRAG,
3016 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
3018 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3019 LOG (GNUNET_ERROR_TYPE_DEBUG,
3020 "Created new defragmentation context for %u-byte fragment from `%s'\n",
3021 (unsigned int) ntohs (msg->size),
3022 udp_address_to_string (plugin,
3028 LOG (GNUNET_ERROR_TYPE_DEBUG,
3029 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
3030 (unsigned int) ntohs (msg->size),
3031 udp_address_to_string (plugin,
3037 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag,
3040 /* keep this 'rc' from expiring */
3041 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs,
3043 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3045 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
3046 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
3048 /* remove 'rc' that was inactive the longest */
3049 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
3050 GNUNET_assert (NULL != d_ctx);
3051 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3052 GNUNET_free (d_ctx);
3053 GNUNET_STATISTICS_update (plugin->env->stats,
3054 "# UDP, Defragmentations aborted",
3062 * Read and process a message from the given socket.
3064 * @param plugin the overall plugin
3065 * @param rsock socket to read from
3068 udp_select_read (struct Plugin *plugin,
3069 struct GNUNET_NETWORK_Handle *rsock)
3072 struct sockaddr_storage addr;
3073 char buf[65536] GNUNET_ALIGN;
3075 const struct GNUNET_MessageHeader *msg;
3076 struct IPv4UdpAddress v4;
3077 struct IPv6UdpAddress v6;
3078 const struct sockaddr *sa;
3079 const struct sockaddr_in *sa4;
3080 const struct sockaddr_in6 *sa6;
3081 const union UdpAddress *int_addr;
3082 size_t int_addr_len;
3083 enum GNUNET_ATS_Network_Type network_type;
3085 fromlen = sizeof (addr);
3089 size = GNUNET_NETWORK_socket_recvfrom (rsock,
3092 (struct sockaddr *) &addr,
3094 sa = (const struct sockaddr *) &addr;
3096 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
3097 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
3098 * on this socket has failed.
3100 * WSAECONNRESET - The virtual circuit was reset by the remote side
3101 * executing a hard or abortive close. The application should close
3102 * the socket; it is no longer usable. On a UDP-datagram socket this
3103 * error indicates a previous send operation resulted in an ICMP Port
3104 * Unreachable message.
3106 if ( (-1 == size) &&
3107 (ECONNRESET == errno) )
3112 LOG (GNUNET_ERROR_TYPE_DEBUG,
3113 "UDP failed to receive data: %s\n",
3115 /* Connection failure or something. Not a protocol violation. */
3119 /* Check if this is a STUN packet */
3120 if (GNUNET_NAT_is_valid_stun_packet (plugin->nat,
3123 return; /* was STUN, do not process further */
3125 if (size < sizeof(struct GNUNET_MessageHeader))
3127 LOG (GNUNET_ERROR_TYPE_WARNING,
3128 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
3129 (unsigned int ) size,
3132 /* _MAY_ be a connection failure (got partial message) */
3133 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
3134 GNUNET_break_op (0);
3138 msg = (const struct GNUNET_MessageHeader *) buf;
3139 LOG (GNUNET_ERROR_TYPE_DEBUG,
3140 "UDP received %u-byte message from `%s' type %u\n",
3141 (unsigned int) size,
3145 if (size != ntohs (msg->size))
3147 LOG (GNUNET_ERROR_TYPE_WARNING,
3148 "UDP malformed message header from %s\n",
3149 (unsigned int) size,
3152 GNUNET_break_op (0);
3155 GNUNET_STATISTICS_update (plugin->env->stats,
3156 "# UDP, total bytes received",
3159 network_type = plugin->env->get_address_type (plugin->env->cls,
3162 switch (sa->sa_family)
3165 sa4 = (const struct sockaddr_in *) &addr;
3167 v4.ipv4_addr = sa4->sin_addr.s_addr;
3168 v4.u4_port = sa4->sin_port;
3169 int_addr = (union UdpAddress *) &v4;
3170 int_addr_len = sizeof (v4);
3173 sa6 = (const struct sockaddr_in6 *) &addr;
3175 v6.ipv6_addr = sa6->sin6_addr;
3176 v6.u6_port = sa6->sin6_port;
3177 int_addr = (union UdpAddress *) &v6;
3178 int_addr_len = sizeof (v6);
3185 switch (ntohs (msg->type))
3187 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
3188 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
3189 udp_broadcast_receive (plugin,
3196 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
3197 if (ntohs (msg->size) < sizeof(struct UDPMessage))
3202 process_udp_message (plugin,
3203 (const struct UDPMessage *) msg,
3208 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
3209 read_process_ack (plugin,
3214 case GNUNET_MESSAGE_TYPE_FRAGMENT:
3215 read_process_fragment (plugin,
3229 * Removes messages from the transmission queue that have
3230 * timed out, and then selects a message that should be
3233 * @param plugin the UDP plugin
3234 * @param sock which socket should we process the queue for (v4 or v6)
3235 * @return message selected for transmission, or NULL for none
3237 static struct UDP_MessageWrapper *
3238 remove_timeout_messages_and_select (struct Plugin *plugin,
3239 struct GNUNET_NETWORK_Handle *sock)
3241 struct UDP_MessageWrapper *udpw;
3242 struct GNUNET_TIME_Relative remaining;
3243 struct GNUNET_ATS_Session *session;
3246 removed = GNUNET_NO;
3247 udpw = (sock == plugin->sockv4)
3248 ? plugin->ipv4_queue_head
3249 : plugin->ipv6_queue_head;
3250 while (NULL != udpw)
3252 session = udpw->session;
3253 /* Find messages with timeout */
3254 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
3255 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
3257 /* Message timed out */
3258 removed = GNUNET_YES;
3261 udpw->qc (udpw->qc_cls,
3266 if (sock == plugin->sockv4)
3268 udpw = plugin->ipv4_queue_head;
3270 else if (sock == plugin->sockv6)
3272 udpw = plugin->ipv6_queue_head;
3276 GNUNET_break (0); /* should never happen */
3279 GNUNET_STATISTICS_update (plugin->env->stats,
3280 "# messages discarded due to timeout",
3286 /* Message did not time out, check transmission time */
3287 remaining = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
3288 if (0 == remaining.rel_value_us)
3290 /* this message is not delayed */
3291 LOG (GNUNET_ERROR_TYPE_DEBUG,
3292 "Message for peer `%s' (%u bytes) is not delayed \n",
3293 GNUNET_i2s (&udpw->session->target),
3294 udpw->payload_size);
3295 break; /* Found message to send, break */
3299 /* Message is delayed, try next */
3300 LOG (GNUNET_ERROR_TYPE_DEBUG,
3301 "Message for peer `%s' (%u bytes) is delayed for %s\n",
3302 GNUNET_i2s (&udpw->session->target),
3304 GNUNET_STRINGS_relative_time_to_string (remaining,
3310 if (GNUNET_YES == removed)
3311 notify_session_monitor (session->plugin,
3313 GNUNET_TRANSPORT_SS_UPDATE);
3319 * We failed to transmit a message via UDP. Generate
3320 * a descriptive error message.
3322 * @param plugin our plugin
3323 * @param sa target address we were trying to reach
3324 * @param slen number of bytes in @a sa
3325 * @param error the errno value returned from the sendto() call
3328 analyze_send_error (struct Plugin *plugin,
3329 const struct sockaddr *sa,
3333 enum GNUNET_ATS_Network_Type type;
3335 type = plugin->env->get_address_type (plugin->env->cls,
3338 if ( ( (GNUNET_ATS_NET_LAN == type) ||
3339 (GNUNET_ATS_NET_WAN == type) ) &&
3340 ( (ENETUNREACH == errno) ||
3341 (ENETDOWN == errno) ) )
3343 if (slen == sizeof (struct sockaddr_in))
3345 /* IPv4: "Network unreachable" or "Network down"
3347 * This indicates we do not have connectivity
3349 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3350 _("UDP could not transmit message to `%s': "
3351 "Network seems down, please check your network configuration\n"),
3355 if (slen == sizeof (struct sockaddr_in6))
3357 /* IPv6: "Network unreachable" or "Network down"
3359 * This indicates that this system is IPv6 enabled, but does not
3360 * have a valid global IPv6 address assigned or we do not have
3363 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3364 _("UDP could not transmit IPv6 message! "
3365 "Please check your network configuration and disable IPv6 if your "
3366 "connection does not have a global IPv6 address\n"));
3371 LOG (GNUNET_ERROR_TYPE_WARNING,
3372 "UDP could not transmit message to `%s': `%s'\n",
3381 * It is time to try to transmit a UDP message. Select one
3384 * @param plugin the plugin
3385 * @param sock which socket (v4/v6) to send on
3388 udp_select_send (struct Plugin *plugin,
3389 struct GNUNET_NETWORK_Handle *sock)
3393 const struct sockaddr *a;
3394 const struct IPv4UdpAddress *u4;
3395 struct sockaddr_in a4;
3396 const struct IPv6UdpAddress *u6;
3397 struct sockaddr_in6 a6;
3398 struct UDP_MessageWrapper *udpw;
3400 /* Find message(s) to send */
3401 while (NULL != (udpw = remove_timeout_messages_and_select (plugin,
3404 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
3406 u4 = udpw->session->address->address;
3410 a4.sin_family = AF_INET;
3411 #if HAVE_SOCKADDR_IN_SIN_LEN
3412 a4.sin_len = sizeof (a4);
3414 a4.sin_port = u4->u4_port;
3415 a4.sin_addr.s_addr = u4->ipv4_addr;
3416 a = (const struct sockaddr *) &a4;
3419 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
3421 u6 = udpw->session->address->address;
3425 a6.sin6_family = AF_INET6;
3426 #if HAVE_SOCKADDR_IN_SIN_LEN
3427 a6.sin6_len = sizeof (a6);
3429 a6.sin6_port = u6->u6_port;
3430 a6.sin6_addr = u6->ipv6_addr;
3431 a = (const struct sockaddr *) &a6;
3439 udpw->qc (udpw->qc_cls,
3442 notify_session_monitor (plugin,
3444 GNUNET_TRANSPORT_SS_UPDATE);
3448 sent = GNUNET_NETWORK_socket_sendto (sock,
3453 udpw->session->last_transmit_time
3454 = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
3455 udpw->session->last_transmit_time);
3458 if (GNUNET_SYSERR == sent)
3461 analyze_send_error (plugin,
3465 udpw->qc (udpw->qc_cls,
3468 GNUNET_STATISTICS_update (plugin->env->stats,
3469 "# UDP, total, bytes, sent, failure",
3472 GNUNET_STATISTICS_update (plugin->env->stats,
3473 "# UDP, total, messages, sent, failure",
3480 LOG (GNUNET_ERROR_TYPE_DEBUG,
3481 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3482 (unsigned int) (udpw->msg_size),
3483 GNUNET_i2s (&udpw->session->target),
3487 (sent < 0) ? STRERROR (errno) : "ok");
3488 GNUNET_STATISTICS_update (plugin->env->stats,
3489 "# UDP, total, bytes, sent, success",
3492 GNUNET_STATISTICS_update (plugin->env->stats,
3493 "# UDP, total, messages, sent, success",
3496 if (NULL != udpw->frag_ctx)
3497 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3498 udpw->qc (udpw->qc_cls,
3502 notify_session_monitor (plugin,
3504 GNUNET_TRANSPORT_SS_UPDATE);
3510 /* ***************** Event loop (part 2) *************** */
3514 * We have been notified that our readset has something to read. We don't
3515 * know which socket needs to be read, so we have to check each one
3516 * Then reschedule this function to be called again once more is available.
3518 * @param cls the plugin handle
3519 * @param tc the scheduling context
3522 udp_plugin_select_v4 (void *cls,
3523 const struct GNUNET_SCHEDULER_TaskContext *tc)
3525 struct Plugin *plugin = cls;
3527 plugin->select_task_v4 = NULL;
3528 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3530 if (NULL == plugin->sockv4)
3532 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3533 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3535 udp_select_read (plugin,
3537 udp_select_send (plugin,
3539 schedule_select_v4 (plugin);
3544 * We have been notified that our readset has something to read. We don't
3545 * know which socket needs to be read, so we have to check each one
3546 * Then reschedule this function to be called again once more is available.
3548 * @param cls the plugin handle
3549 * @param tc the scheduling context
3552 udp_plugin_select_v6 (void *cls,
3553 const struct GNUNET_SCHEDULER_TaskContext *tc)
3555 struct Plugin *plugin = cls;
3557 plugin->select_task_v6 = NULL;
3558 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3560 if (NULL == plugin->sockv6)
3562 if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3563 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3565 udp_select_read (plugin,
3568 udp_select_send (plugin,
3570 schedule_select_v6 (plugin);
3574 /* ******************* Initialization *************** */
3578 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3580 * @param plugin the plugin to initialize
3581 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3582 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3583 * @return number of sockets that were successfully bound
3586 setup_sockets (struct Plugin *plugin,
3587 const struct sockaddr_in6 *bind_v6,
3588 const struct sockaddr_in *bind_v4)
3591 int sockets_created = 0;
3592 struct sockaddr_in6 server_addrv6;
3593 struct sockaddr_in server_addrv4;
3594 const struct sockaddr *server_addr;
3595 const struct sockaddr *addrs[2];
3596 socklen_t addrlens[2];
3600 /* Create IPv6 socket */
3602 if (GNUNET_YES == plugin->enable_ipv6)
3604 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
3607 if (NULL == plugin->sockv6)
3609 LOG (GNUNET_ERROR_TYPE_INFO,
3610 _("Disabling IPv6 since it is not supported on this system!\n"));
3611 plugin->enable_ipv6 = GNUNET_NO;
3615 memset (&server_addrv6,
3617 sizeof(struct sockaddr_in6));
3618 #if HAVE_SOCKADDR_IN_SIN_LEN
3619 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3621 server_addrv6.sin6_family = AF_INET6;
3622 if (NULL != bind_v6)
3623 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3625 server_addrv6.sin6_addr = in6addr_any;
3627 if (0 == plugin->port) /* autodetect */
3628 server_addrv6.sin6_port
3629 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3633 server_addrv6.sin6_port = htons (plugin->port);
3634 addrlen = sizeof (struct sockaddr_in6);
3635 server_addr = (const struct sockaddr *) &server_addrv6;
3640 LOG(GNUNET_ERROR_TYPE_DEBUG,
3641 "Binding to IPv6 `%s'\n",
3642 GNUNET_a2s (server_addr,
3646 GNUNET_NETWORK_socket_bind (plugin->sockv6,
3651 if (0 != plugin->port)
3653 tries = 10; /* fail immediately */
3654 break; /* bind failed on specific port */
3657 server_addrv6.sin6_port
3658 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3665 GNUNET_NETWORK_socket_close (plugin->sockv6);
3666 plugin->enable_ipv6 = GNUNET_NO;
3667 plugin->sockv6 = NULL;
3671 plugin->port = ntohs (server_addrv6.sin6_port);
3673 if (NULL != plugin->sockv6)
3675 LOG (GNUNET_ERROR_TYPE_DEBUG,
3676 "IPv6 UDP socket created listinging at %s\n",
3677 GNUNET_a2s (server_addr,
3679 addrs[sockets_created] = server_addr;
3680 addrlens[sockets_created] = addrlen;
3685 LOG (GNUNET_ERROR_TYPE_WARNING,
3686 _("Failed to bind UDP socket to %s: %s\n"),
3687 GNUNET_a2s (server_addr,
3694 /* Create IPv4 socket */
3696 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
3699 if (NULL == plugin->sockv4)
3701 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3703 LOG (GNUNET_ERROR_TYPE_INFO,
3704 _("Disabling IPv4 since it is not supported on this system!\n"));
3705 plugin->enable_ipv4 = GNUNET_NO;
3709 memset (&server_addrv4,
3711 sizeof(struct sockaddr_in));
3712 #if HAVE_SOCKADDR_IN_SIN_LEN
3713 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3715 server_addrv4.sin_family = AF_INET;
3716 if (NULL != bind_v4)
3717 server_addrv4.sin_addr = bind_v4->sin_addr;
3719 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3721 if (0 == plugin->port)
3723 server_addrv4.sin_port
3724 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3728 server_addrv4.sin_port = htons (plugin->port);
3730 addrlen = sizeof (struct sockaddr_in);
3731 server_addr = (const struct sockaddr *) &server_addrv4;
3736 LOG (GNUNET_ERROR_TYPE_DEBUG,
3737 "Binding to IPv4 `%s'\n",
3738 GNUNET_a2s (server_addr,
3743 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3748 if (0 != plugin->port)
3750 tries = 10; /* fail */
3751 break; /* bind failed on specific port */
3755 server_addrv4.sin_port
3756 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3763 GNUNET_NETWORK_socket_close (plugin->sockv4);
3764 plugin->enable_ipv4 = GNUNET_NO;
3765 plugin->sockv4 = NULL;
3769 plugin->port = ntohs (server_addrv4.sin_port);
3772 if (NULL != plugin->sockv4)
3774 LOG (GNUNET_ERROR_TYPE_DEBUG,
3775 "IPv4 socket created on port %s\n",
3776 GNUNET_a2s (server_addr,
3778 addrs[sockets_created] = server_addr;
3779 addrlens[sockets_created] = addrlen;
3784 LOG (GNUNET_ERROR_TYPE_ERROR,
3785 _("Failed to bind UDP socket to %s: %s\n"),
3786 GNUNET_a2s (server_addr,
3792 if (0 == sockets_created)
3794 LOG (GNUNET_ERROR_TYPE_WARNING,
3795 _("Failed to open UDP sockets\n"));
3796 return 0; /* No sockets created, return */
3798 schedule_select_v4 (plugin);
3799 schedule_select_v6 (plugin);
3800 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3806 &udp_nat_port_map_callback,
3810 return sockets_created;
3815 * The exported method. Makes the core api available via a global and
3816 * returns the udp transport API.
3818 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3819 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3822 libgnunet_plugin_transport_udp_init (void *cls)
3824 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3825 struct GNUNET_TRANSPORT_PluginFunctions *api;
3827 unsigned long long port;
3828 unsigned long long aport;
3829 unsigned long long udp_max_bps;
3830 unsigned long long enable_v6;
3831 unsigned long long enable_broadcasting;
3832 unsigned long long enable_broadcasting_recv;
3833 char *bind4_address;
3834 char *bind6_address;
3835 struct GNUNET_TIME_Relative interval;
3836 struct sockaddr_in server_addrv4;
3837 struct sockaddr_in6 server_addrv6;
3842 if (NULL == env->receive)
3844 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3845 initialze the plugin or the API */
3846 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3848 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3849 api->address_to_string = &udp_address_to_string;
3850 api->string_to_address = &udp_string_to_address;
3854 /* Get port number: port == 0 : autodetect a port,
3855 * > 0 : use this port, not given : 2086 default */
3857 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3864 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3867 _("must be in [0,65535]"));
3871 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3878 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3881 _("must be in [0,65535]"));
3886 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3889 enable_v6 = GNUNET_NO;
3891 enable_v6 = GNUNET_YES;
3893 have_bind4 = GNUNET_NO;
3894 memset (&server_addrv4,
3896 sizeof (server_addrv4));
3898 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3903 LOG (GNUNET_ERROR_TYPE_DEBUG,
3904 "Binding UDP plugin to specific address: `%s'\n",
3906 if (1 != inet_pton (AF_INET,
3908 &server_addrv4.sin_addr))
3910 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3913 _("must be valid IPv4 address"));
3914 GNUNET_free (bind4_address);
3917 have_bind4 = GNUNET_YES;
3919 GNUNET_free_non_null (bind4_address);
3920 have_bind6 = GNUNET_NO;
3921 memset (&server_addrv6,
3923 sizeof (server_addrv6));
3925 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3930 LOG (GNUNET_ERROR_TYPE_DEBUG,
3931 "Binding udp plugin to specific address: `%s'\n",
3933 if (1 != inet_pton (AF_INET6,
3935 &server_addrv6.sin6_addr))
3937 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3940 _("must be valid IPv6 address"));
3941 GNUNET_free (bind6_address);
3944 have_bind6 = GNUNET_YES;
3946 GNUNET_free_non_null (bind6_address);
3948 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3951 if (enable_broadcasting == GNUNET_SYSERR)
3952 enable_broadcasting = GNUNET_NO;
3954 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3956 "BROADCAST_RECEIVE");
3957 if (enable_broadcasting_recv == GNUNET_SYSERR)
3958 enable_broadcasting_recv = GNUNET_YES;
3960 if (GNUNET_SYSERR ==
3961 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3963 "BROADCAST_INTERVAL",
3966 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
3970 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3975 /* 50 MB/s == infinity for practical purposes */
3976 udp_max_bps = 1024 * 1024 * 50;
3979 p = GNUNET_new (struct Plugin);
3982 p->broadcast_interval = interval;
3983 p->enable_ipv6 = enable_v6;
3984 p->enable_ipv4 = GNUNET_YES; /* default */
3985 p->enable_broadcasting = enable_broadcasting;
3986 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3988 p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
3990 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3991 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages,
3993 GNUNET_BANDWIDTH_tracker_init (&p->tracker,
3996 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps),
3998 res = setup_sockets (p,
3999 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
4000 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
4002 ( (NULL == p->sockv4) &&
4003 (NULL == p->sockv6) ) )
4005 LOG (GNUNET_ERROR_TYPE_ERROR,
4006 _("Failed to create UDP network sockets\n"));
4007 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
4008 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
4009 GNUNET_SERVER_mst_destroy (p->mst);
4014 /* Setup broadcasting and receiving beacons */
4019 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
4021 api->disconnect_session = &udp_disconnect_session;
4022 api->query_keepalive_factor = &udp_query_keepalive_factor;
4023 api->disconnect_peer = &udp_disconnect;
4024 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
4025 api->address_to_string = &udp_address_to_string;
4026 api->string_to_address = &udp_string_to_address;
4027 api->check_address = &udp_plugin_check_address;
4028 api->get_session = &udp_plugin_get_session;
4029 api->send = &udp_plugin_send;
4030 api->get_network = &udp_plugin_get_network;
4031 api->get_network_for_address = &udp_plugin_get_network_for_address;
4032 api->update_session_timeout = &udp_plugin_update_session_timeout;
4033 api->setup_monitor = &udp_plugin_setup_monitor;
4039 * Function called on each entry in the defragmentation heap to
4043 * @param node node in the heap (to be removed)
4044 * @param element a `struct DefragContext` to be cleaned up
4045 * @param cost unused
4046 * @return #GNUNET_YES
4049 heap_cleanup_iterator (void *cls,
4050 struct GNUNET_CONTAINER_HeapNode *node,
4052 GNUNET_CONTAINER_HeapCostType cost)
4054 struct DefragContext *d_ctx = element;
4056 GNUNET_CONTAINER_heap_remove_node (node);
4057 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
4058 GNUNET_free (d_ctx);
4064 * The exported method. Makes the core api available via a global and
4065 * returns the udp transport API.
4067 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
4071 libgnunet_plugin_transport_udp_done (void *cls)
4073 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
4074 struct Plugin *plugin = api->cls;
4075 struct PrettyPrinterContext *cur;
4076 struct UDP_MessageWrapper *udpw;
4083 stop_broadcast (plugin);
4084 if (NULL != plugin->select_task_v4)
4086 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
4087 plugin->select_task_v4 = NULL;
4089 if (NULL != plugin->select_task_v6)
4091 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
4092 plugin->select_task_v6 = NULL;
4094 if (NULL != plugin->sockv4)
4096 GNUNET_break (GNUNET_OK ==
4097 GNUNET_NETWORK_socket_close (plugin->sockv4));
4098 plugin->sockv4 = NULL;
4100 if (NULL != plugin->sockv6)
4102 GNUNET_break (GNUNET_OK ==
4103 GNUNET_NETWORK_socket_close (plugin->sockv6));
4104 plugin->sockv6 = NULL;
4106 if (NULL != plugin->nat)
4108 GNUNET_NAT_unregister (plugin->nat);
4111 if (NULL != plugin->defrag_ctxs)
4113 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
4114 &heap_cleanup_iterator,
4116 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
4117 plugin->defrag_ctxs = NULL;
4119 if (NULL != plugin->mst)
4121 GNUNET_SERVER_mst_destroy (plugin->mst);
4124 while (NULL != (udpw = plugin->ipv4_queue_head))
4128 udpw->qc (udpw->qc_cls,
4133 while (NULL != (udpw = plugin->ipv6_queue_head))
4137 udpw->qc (udpw->qc_cls,
4142 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
4143 &disconnect_and_free_it,
4145 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
4147 while (NULL != (cur = plugin->ppc_dll_head))
4150 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
4151 plugin->ppc_dll_tail,
4153 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
4154 if (NULL != cur->timeout_task)
4156 GNUNET_SCHEDULER_cancel (cur->timeout_task);
4157 cur->timeout_task = NULL;
4161 GNUNET_free (plugin);
4166 /* end of plugin_transport_udp.c */