2 This file is part of GNUnet
3 Copyright (C) 2010-2017 GNUnet e.V.
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP transport protocol
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 * @author Matthias Wachs
29 #include "plugin_transport_udp.h"
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_util_lib.h"
32 #include "gnunet_fragmentation_lib.h"
33 #include "gnunet_nat_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))
1274 return GNUNET_OK; /* plausible, if unlikely... */
1275 memset (&s6, 0, sizeof (s6));
1276 s6.sin6_family = AF_INET6;
1277 #if HAVE_SOCKADDR_IN_SIN_LEN
1278 s6.sin6_len = sizeof (s6);
1280 s6.sin6_port = v6->u6_port;
1281 s6.sin6_addr = v6->ipv6_addr;
1284 GNUNET_NAT_test_address (plugin->nat,
1286 sizeof(struct sockaddr_in6)))
1287 return GNUNET_SYSERR;
1291 GNUNET_break_op (0);
1292 return GNUNET_SYSERR;
1299 * Our external IP address/port mapping has changed.
1301 * @param cls closure, the `struct Plugin`
1302 * @param add_remove #GNUNET_YES to mean the new public IP address,
1303 * #GNUNET_NO to mean the previous (now invalid) one
1304 * @param ac address class the address belongs to
1305 * @param addr either the previous or the new public IP address
1306 * @param addrlen actual length of the @a addr
1309 udp_nat_port_map_callback (void *cls,
1311 enum GNUNET_NAT_AddressClass ac,
1312 const struct sockaddr *addr,
1315 struct Plugin *plugin = cls;
1316 struct GNUNET_HELLO_Address *address;
1317 struct IPv4UdpAddress u4;
1318 struct IPv6UdpAddress u6;
1322 LOG (GNUNET_ERROR_TYPE_DEBUG,
1323 (GNUNET_YES == add_remove)
1324 ? "NAT notification to add address `%s'\n"
1325 : "NAT notification to remove address `%s'\n",
1328 /* convert 'address' to our internal format */
1329 switch (addr->sa_family)
1333 const struct sockaddr_in *i4;
1335 GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
1336 i4 = (const struct sockaddr_in *) addr;
1337 if (0 == ntohs (i4->sin_port))
1338 return; /* Port = 0 means unmapped, ignore these for UDP. */
1342 u4.options = htonl (plugin->myoptions);
1343 u4.ipv4_addr = i4->sin_addr.s_addr;
1344 u4.u4_port = i4->sin_port;
1346 args = sizeof (struct IPv4UdpAddress);
1351 const struct sockaddr_in6 *i6;
1353 GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
1354 i6 = (const struct sockaddr_in6 *) addr;
1355 if (0 == ntohs (i6->sin6_port))
1356 return; /* Port = 0 means unmapped, ignore these for UDP. */
1360 u6.options = htonl (plugin->myoptions);
1361 u6.ipv6_addr = i6->sin6_addr;
1362 u6.u6_port = i6->sin6_port;
1364 args = sizeof (struct IPv6UdpAddress);
1371 /* modify our published address list */
1372 /* TODO: use 'ac' here in the future... */
1373 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1377 GNUNET_HELLO_ADDRESS_INFO_NONE);
1378 plugin->env->notify_address (plugin->env->cls,
1381 GNUNET_HELLO_address_free (address);
1385 /* ********************* Finding sessions ******************* */
1389 * Closure for #session_cmp_it().
1391 struct GNUNET_ATS_SessionCompareContext
1394 * Set to session matching the address.
1396 struct GNUNET_ATS_Session *res;
1399 * Address we are looking for.
1401 const struct GNUNET_HELLO_Address *address;
1406 * Find a session with a matching address.
1408 * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
1409 * @param key peer identity (unused)
1410 * @param value the `struct GNUNET_ATS_Session *`
1411 * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
1414 session_cmp_it (void *cls,
1415 const struct GNUNET_PeerIdentity *key,
1418 struct GNUNET_ATS_SessionCompareContext *cctx = cls;
1419 struct GNUNET_ATS_Session *s = value;
1421 if (0 == GNUNET_HELLO_address_cmp (s->address,
1424 GNUNET_assert (GNUNET_NO == s->in_destroy);
1433 * Locate an existing session the transport service is using to
1434 * send data to another peer. Performs some basic sanity checks
1435 * on the address and then tries to locate a matching session.
1437 * @param cls the plugin
1438 * @param address the address we should locate the session by
1439 * @return the session if it exists, or NULL if it is not found
1441 static struct GNUNET_ATS_Session *
1442 udp_plugin_lookup_session (void *cls,
1443 const struct GNUNET_HELLO_Address *address)
1445 struct Plugin *plugin = cls;
1446 const struct IPv6UdpAddress *udp_a6;
1447 const struct IPv4UdpAddress *udp_a4;
1448 struct GNUNET_ATS_SessionCompareContext cctx;
1450 if (NULL == address->address)
1455 if (sizeof(struct IPv4UdpAddress) == address->address_length)
1457 if (NULL == plugin->sockv4)
1459 udp_a4 = (const struct IPv4UdpAddress *) address->address;
1460 if (0 == udp_a4->u4_port)
1466 else if (sizeof(struct IPv6UdpAddress) == address->address_length)
1468 if (NULL == plugin->sockv6)
1470 udp_a6 = (const struct IPv6UdpAddress *) address->address;
1471 if (0 == udp_a6->u6_port)
1483 /* check if session already exists */
1484 cctx.address = address;
1486 LOG (GNUNET_ERROR_TYPE_DEBUG,
1487 "Looking for existing session for peer `%s' with address `%s'\n",
1488 GNUNET_i2s (&address->peer),
1489 udp_address_to_string (plugin,
1491 address->address_length));
1492 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
1496 if (NULL == cctx.res)
1498 LOG (GNUNET_ERROR_TYPE_DEBUG,
1499 "Found existing session %p\n",
1505 /* ********************** Timeout ****************** */
1509 * Increment session timeout due to activity.
1511 * @param s session to reschedule timeout activity for
1514 reschedule_session_timeout (struct GNUNET_ATS_Session *s)
1516 if (GNUNET_YES == s->in_destroy)
1518 GNUNET_assert (NULL != s->timeout_task);
1519 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
1525 * Function that will be called whenever the transport service wants to
1526 * notify the plugin that a session is still active and in use and
1527 * therefore the session timeout for this session has to be updated
1529 * @param cls closure with the `struct Plugin`
1530 * @param peer which peer was the session for
1531 * @param session which session is being updated
1534 udp_plugin_update_session_timeout (void *cls,
1535 const struct GNUNET_PeerIdentity *peer,
1536 struct GNUNET_ATS_Session *session)
1538 struct Plugin *plugin = cls;
1541 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1548 /* Reschedule session timeout */
1549 reschedule_session_timeout (session);
1553 /* ************************* Sending ************************ */
1557 * Remove the given message from the transmission queue and
1558 * update all applicable statistics.
1560 * @param plugin the UDP plugin
1561 * @param udpw message wrapper to dequeue
1564 dequeue (struct Plugin *plugin,
1565 struct UDP_MessageWrapper *udpw)
1567 struct GNUNET_ATS_Session *session = udpw->session;
1569 if (plugin->bytes_in_buffer < udpw->msg_size)
1575 GNUNET_STATISTICS_update (plugin->env->stats,
1576 "# UDP, total bytes in send buffers",
1577 - (long long) udpw->msg_size,
1579 plugin->bytes_in_buffer -= udpw->msg_size;
1581 GNUNET_STATISTICS_update (plugin->env->stats,
1582 "# UDP, total messages in send buffers",
1585 if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length)
1587 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head,
1588 plugin->ipv4_queue_tail,
1591 else if (sizeof(struct IPv6UdpAddress) == udpw->session->address->address_length)
1593 GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head,
1594 plugin->ipv6_queue_tail,
1602 GNUNET_assert (session->msgs_in_queue > 0);
1603 session->msgs_in_queue--;
1604 GNUNET_assert (session->bytes_in_queue >= udpw->msg_size);
1605 session->bytes_in_queue -= udpw->msg_size;
1610 * Enqueue a message for transmission and update statistics.
1612 * @param plugin the UDP plugin
1613 * @param udpw message wrapper to queue
1616 enqueue (struct Plugin *plugin,
1617 struct UDP_MessageWrapper *udpw)
1619 struct GNUNET_ATS_Session *session = udpw->session;
1621 if (GNUNET_YES == session->in_destroy)
1626 if (plugin->bytes_in_buffer > INT64_MAX - udpw->msg_size)
1632 GNUNET_STATISTICS_update (plugin->env->stats,
1633 "# UDP, total bytes in send buffers",
1636 plugin->bytes_in_buffer += udpw->msg_size;
1638 GNUNET_STATISTICS_update (plugin->env->stats,
1639 "# UDP, total messages in send buffers",
1642 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
1644 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1645 plugin->ipv4_queue_tail,
1648 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
1650 GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head,
1651 plugin->ipv6_queue_tail,
1657 udpw->cont (udpw->cont_cls,
1665 session->msgs_in_queue++;
1666 session->bytes_in_queue += udpw->msg_size;
1671 * We have completed our (attempt) to transmit a message that had to
1672 * be fragmented -- either because we got an ACK saying that all
1673 * fragments were received, or because of timeout / disconnect. Clean
1676 * @param frag_ctx fragmentation context to clean up
1677 * @param result #GNUNET_OK if we succeeded (got ACK),
1678 * #GNUNET_SYSERR if the transmission failed
1681 fragmented_message_done (struct UDP_FragmentationContext *frag_ctx,
1684 struct Plugin *plugin = frag_ctx->plugin;
1685 struct GNUNET_ATS_Session *s = frag_ctx->session;
1686 struct UDP_MessageWrapper *udpw;
1687 struct UDP_MessageWrapper *tmp;
1689 struct GNUNET_TIME_Relative delay;
1691 LOG (GNUNET_ERROR_TYPE_DEBUG,
1692 "%p: Fragmented message removed with result %s\n",
1694 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1695 /* Call continuation for fragmented message */
1696 if (frag_ctx->on_wire_size >= frag_ctx->payload_size)
1697 overhead = frag_ctx->on_wire_size - frag_ctx->payload_size;
1699 overhead = frag_ctx->on_wire_size;
1700 delay = GNUNET_TIME_absolute_get_duration (frag_ctx->start_time);
1701 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1703 LOG (GNUNET_ERROR_TYPE_WARNING,
1704 "Fragmented message acknowledged after %s (expected at %s)\n",
1705 GNUNET_STRINGS_relative_time_to_string (delay,
1707 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1711 LOG (GNUNET_ERROR_TYPE_DEBUG,
1712 "Fragmented message acknowledged after %s (expected at %s)\n",
1713 GNUNET_STRINGS_relative_time_to_string (delay,
1715 GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time));
1718 if (NULL != frag_ctx->cont)
1719 frag_ctx->cont (frag_ctx->cont_cls,
1722 s->frag_ctx->payload_size,
1723 frag_ctx->on_wire_size);
1724 GNUNET_STATISTICS_update (plugin->env->stats,
1725 "# UDP, fragmented messages active",
1729 if (GNUNET_OK == result)
1731 GNUNET_STATISTICS_update (plugin->env->stats,
1732 "# UDP, fragmented msgs, messages, sent, success",
1735 GNUNET_STATISTICS_update (plugin->env->stats,
1736 "# UDP, fragmented msgs, bytes payload, sent, success",
1737 s->frag_ctx->payload_size,
1739 GNUNET_STATISTICS_update (plugin->env->stats,
1740 "# UDP, fragmented msgs, bytes overhead, sent, success",
1743 GNUNET_STATISTICS_update (plugin->env->stats,
1744 "# UDP, total, bytes overhead, sent",
1747 GNUNET_STATISTICS_update (plugin->env->stats,
1748 "# UDP, total, bytes payload, sent",
1749 s->frag_ctx->payload_size,
1754 GNUNET_STATISTICS_update (plugin->env->stats,
1755 "# UDP, fragmented msgs, messages, sent, failure",
1758 GNUNET_STATISTICS_update (plugin->env->stats,
1759 "# UDP, fragmented msgs, bytes payload, sent, failure",
1760 s->frag_ctx->payload_size,
1762 GNUNET_STATISTICS_update (plugin->env->stats,
1763 "# UDP, fragmented msgs, bytes payload, sent, failure",
1766 GNUNET_STATISTICS_update (plugin->env->stats,
1767 "# UDP, fragmented msgs, bytes payload, sent, failure",
1772 /* Remove remaining fragments from queue, no need to transmit those
1774 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1776 udpw = plugin->ipv6_queue_head;
1777 while (NULL != udpw)
1780 if ( (udpw->frag_ctx != NULL) &&
1781 (udpw->frag_ctx == frag_ctx) )
1790 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1792 udpw = plugin->ipv4_queue_head;
1793 while (NULL != udpw)
1796 if ( (NULL != udpw->frag_ctx) &&
1797 (udpw->frag_ctx == frag_ctx) )
1806 notify_session_monitor (s->plugin,
1808 GNUNET_TRANSPORT_SS_UPDATE);
1809 GNUNET_FRAGMENT_context_destroy (frag_ctx->frag,
1810 &s->last_expected_msg_delay,
1811 &s->last_expected_ack_delay);
1813 GNUNET_free (frag_ctx);
1818 * We are finished with a fragment in the message queue.
1819 * Notify the continuation and update statistics.
1821 * @param cls the `struct Plugin *`
1822 * @param udpw the queue entry
1823 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1826 qc_fragment_sent (void *cls,
1827 struct UDP_MessageWrapper *udpw,
1830 struct Plugin *plugin = cls;
1832 GNUNET_assert (NULL != udpw->frag_ctx);
1833 if (GNUNET_OK == result)
1835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1836 "Fragment of message with %u bytes transmitted to %s\n",
1837 (unsigned int) udpw->payload_size,
1838 GNUNET_i2s (&udpw->session->target));
1839 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1840 GNUNET_STATISTICS_update (plugin->env->stats,
1841 "# UDP, fragmented msgs, fragments, sent, success",
1844 GNUNET_STATISTICS_update (plugin->env->stats,
1845 "# UDP, fragmented msgs, fragments bytes, sent, success",
1851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1852 "Failed to transmit fragment of message with %u bytes to %s\n",
1853 (unsigned int) udpw->payload_size,
1854 GNUNET_i2s (&udpw->session->target));
1855 fragmented_message_done (udpw->frag_ctx,
1857 GNUNET_STATISTICS_update (plugin->env->stats,
1858 "# UDP, fragmented msgs, fragments, sent, failure",
1861 GNUNET_STATISTICS_update (plugin->env->stats,
1862 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1870 * Function that is called with messages created by the fragmentation
1871 * module. In the case of the `proc` callback of the
1872 * #GNUNET_FRAGMENT_context_create() function, this function must
1873 * eventually call #GNUNET_FRAGMENT_context_transmission_done().
1875 * @param cls closure, the `struct UDP_FragmentationContext`
1876 * @param msg the message that was created
1879 enqueue_fragment (void *cls,
1880 const struct GNUNET_MessageHeader *msg)
1882 struct UDP_FragmentationContext *frag_ctx = cls;
1883 struct Plugin *plugin = frag_ctx->plugin;
1884 struct UDP_MessageWrapper *udpw;
1885 struct GNUNET_ATS_Session *session = frag_ctx->session;
1886 size_t msg_len = ntohs (msg->size);
1888 LOG (GNUNET_ERROR_TYPE_DEBUG,
1889 "Enqueuing fragment with %u bytes\n",
1891 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1892 udpw->session = session;
1893 udpw->msg_buf = (char *) &udpw[1];
1894 udpw->msg_size = msg_len;
1895 udpw->payload_size = msg_len; /* FIXME: minus fragment overhead */
1896 udpw->timeout = frag_ctx->timeout;
1897 udpw->start_time = frag_ctx->start_time;
1898 udpw->transmission_time = frag_ctx->next_frag_time;
1899 frag_ctx->next_frag_time
1900 = GNUNET_TIME_absolute_add (frag_ctx->next_frag_time,
1901 frag_ctx->flow_delay_from_other_peer);
1902 udpw->frag_ctx = frag_ctx;
1903 udpw->qc = &qc_fragment_sent;
1904 udpw->qc_cls = plugin;
1905 GNUNET_memcpy (udpw->msg_buf,
1910 if (session->address->address_length == sizeof (struct IPv4UdpAddress))
1911 schedule_select_v4 (plugin);
1913 schedule_select_v6 (plugin);
1918 * We are finished with a message from the message queue.
1919 * Notify the continuation and update statistics.
1921 * @param cls the `struct Plugin *`
1922 * @param udpw the queue entry
1923 * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure
1926 qc_message_sent (void *cls,
1927 struct UDP_MessageWrapper *udpw,
1930 struct Plugin *plugin = cls;
1932 struct GNUNET_TIME_Relative delay;
1934 if (udpw->msg_size >= udpw->payload_size)
1935 overhead = udpw->msg_size - udpw->payload_size;
1937 overhead = udpw->msg_size;
1939 if (NULL != udpw->cont)
1941 delay = GNUNET_TIME_absolute_get_duration (udpw->start_time);
1942 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
1944 LOG (GNUNET_ERROR_TYPE_WARNING,
1945 "Message sent via UDP with delay of %s\n",
1946 GNUNET_STRINGS_relative_time_to_string (delay,
1951 LOG (GNUNET_ERROR_TYPE_DEBUG,
1952 "Message sent via UDP with delay of %s\n",
1953 GNUNET_STRINGS_relative_time_to_string (delay,
1956 udpw->cont (udpw->cont_cls,
1957 &udpw->session->target,
1962 if (GNUNET_OK == result)
1964 GNUNET_STATISTICS_update (plugin->env->stats,
1965 "# UDP, unfragmented msgs, messages, sent, success",
1968 GNUNET_STATISTICS_update (plugin->env->stats,
1969 "# UDP, unfragmented msgs, bytes payload, sent, success",
1972 GNUNET_STATISTICS_update (plugin->env->stats,
1973 "# UDP, unfragmented msgs, bytes overhead, sent, success",
1976 GNUNET_STATISTICS_update (plugin->env->stats,
1977 "# UDP, total, bytes overhead, sent",
1980 GNUNET_STATISTICS_update (plugin->env->stats,
1981 "# UDP, total, bytes payload, sent",
1987 GNUNET_STATISTICS_update (plugin->env->stats,
1988 "# UDP, unfragmented msgs, messages, sent, failure",
1991 GNUNET_STATISTICS_update (plugin->env->stats,
1992 "# UDP, unfragmented msgs, bytes payload, sent, failure",
1995 GNUNET_STATISTICS_update (plugin->env->stats,
1996 "# UDP, unfragmented msgs, bytes overhead, sent, failure",
2004 * Function that can be used by the transport service to transmit a
2005 * message using the plugin. Note that in the case of a peer
2006 * disconnecting, the continuation MUST be called prior to the
2007 * disconnect notification itself. This function will be called with
2008 * this peer's HELLO message to initiate a fresh connection to another
2011 * @param cls closure
2012 * @param s which session must be used
2013 * @param msgbuf the message to transmit
2014 * @param msgbuf_size number of bytes in @a msgbuf
2015 * @param priority how important is the message (most plugins will
2016 * ignore message priority and just FIFO)
2017 * @param to how long to wait at most for the transmission (does not
2018 * require plugins to discard the message after the timeout,
2019 * just advisory for the desired delay; most plugins will ignore
2021 * @param cont continuation to call once the message has
2022 * been transmitted (or if the transport is ready
2023 * for the next transmission call; or if the
2024 * peer disconnected...); can be NULL
2025 * @param cont_cls closure for @a cont
2026 * @return number of bytes used (on the physical network, with overheads);
2027 * -1 on hard errors (i.e. address invalid); 0 is a legal value
2028 * and does NOT mean that the message was not transmitted (DV)
2031 udp_plugin_send (void *cls,
2032 struct GNUNET_ATS_Session *s,
2035 unsigned int priority,
2036 struct GNUNET_TIME_Relative to,
2037 GNUNET_TRANSPORT_TransmitContinuation cont,
2040 struct Plugin *plugin = cls;
2041 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
2042 struct UDP_FragmentationContext *frag_ctx;
2043 struct UDP_MessageWrapper *udpw;
2044 struct UDPMessage *udp;
2045 char mbuf[udpmlen] GNUNET_ALIGN;
2046 struct GNUNET_TIME_Relative latency;
2048 if ( (sizeof(struct IPv6UdpAddress) == s->address->address_length) &&
2049 (NULL == plugin->sockv6) )
2050 return GNUNET_SYSERR;
2051 if ( (sizeof(struct IPv4UdpAddress) == s->address->address_length) &&
2052 (NULL == plugin->sockv4) )
2053 return GNUNET_SYSERR;
2054 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
2057 return GNUNET_SYSERR;
2060 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
2065 return GNUNET_SYSERR;
2067 LOG (GNUNET_ERROR_TYPE_DEBUG,
2068 "UDP transmits %u-byte message to `%s' using address `%s'\n",
2070 GNUNET_i2s (&s->target),
2071 udp_address_to_string (plugin,
2072 s->address->address,
2073 s->address->address_length));
2075 udp = (struct UDPMessage *) mbuf;
2076 udp->header.size = htons (udpmlen);
2077 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
2078 udp->reserved = htonl (0);
2079 udp->sender = *plugin->env->my_identity;
2081 /* We do not update the session time out here! Otherwise this
2082 * session will not timeout since we send keep alive before session
2085 * For UDP we update session timeout only on receive, this will
2086 * cover keep alives, since remote peer will reply with keep alive
2089 if (udpmlen <= UDP_MTU)
2091 /* unfragmented message */
2092 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
2094 udpw->msg_buf = (char *) &udpw[1];
2095 udpw->msg_size = udpmlen; /* message size with UDP overhead */
2096 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
2097 udpw->start_time = GNUNET_TIME_absolute_get ();
2098 udpw->timeout = GNUNET_TIME_relative_to_absolute (to);
2099 udpw->transmission_time = s->last_transmit_time;
2100 s->last_transmit_time
2101 = GNUNET_TIME_absolute_add (s->last_transmit_time,
2102 s->flow_delay_from_other_peer);
2104 udpw->cont_cls = cont_cls;
2105 udpw->frag_ctx = NULL;
2106 udpw->qc = &qc_message_sent;
2107 udpw->qc_cls = plugin;
2108 GNUNET_memcpy (udpw->msg_buf,
2110 sizeof (struct UDPMessage));
2111 GNUNET_memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)],
2116 GNUNET_STATISTICS_update (plugin->env->stats,
2117 "# UDP, unfragmented messages queued total",
2120 GNUNET_STATISTICS_update (plugin->env->stats,
2121 "# UDP, unfragmented bytes payload queued total",
2124 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2125 schedule_select_v4 (plugin);
2127 schedule_select_v6 (plugin);
2131 /* fragmented message */
2132 if (NULL != s->frag_ctx)
2133 return GNUNET_SYSERR;
2134 GNUNET_memcpy (&udp[1],
2137 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
2138 frag_ctx->plugin = plugin;
2139 frag_ctx->session = s;
2140 frag_ctx->cont = cont;
2141 frag_ctx->cont_cls = cont_cls;
2142 frag_ctx->start_time = GNUNET_TIME_absolute_get ();
2143 frag_ctx->next_frag_time = s->last_transmit_time;
2144 frag_ctx->flow_delay_from_other_peer
2145 = GNUNET_TIME_relative_divide (s->flow_delay_from_other_peer,
2148 frag_ctx->timeout = GNUNET_TIME_relative_to_absolute (to);
2149 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
2150 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
2151 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
2154 s->last_expected_msg_delay,
2155 s->last_expected_ack_delay,
2159 s->frag_ctx = frag_ctx;
2160 s->last_transmit_time = frag_ctx->next_frag_time;
2161 latency = GNUNET_TIME_absolute_get_remaining (s->last_transmit_time);
2162 if (latency.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2163 LOG (GNUNET_ERROR_TYPE_WARNING,
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 LOG (GNUNET_ERROR_TYPE_DEBUG,
2171 "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n",
2172 GNUNET_STRINGS_relative_time_to_string (latency,
2174 GNUNET_i2s (&s->target),
2175 (unsigned int) s->msgs_in_queue);
2177 GNUNET_STATISTICS_update (plugin->env->stats,
2178 "# UDP, fragmented messages active",
2181 GNUNET_STATISTICS_update (plugin->env->stats,
2182 "# UDP, fragmented messages, total",
2185 GNUNET_STATISTICS_update (plugin->env->stats,
2186 "# UDP, fragmented bytes (payload)",
2187 frag_ctx->payload_size,
2190 notify_session_monitor (s->plugin,
2192 GNUNET_TRANSPORT_SS_UPDATE);
2197 /* ********************** Receiving ********************** */
2201 * Closure for #find_receive_context().
2203 struct FindReceiveContext
2206 * Where to store the result.
2208 struct DefragContext *rc;
2211 * Session associated with this context.
2213 struct GNUNET_ATS_Session *session;
2218 const union UdpAddress *udp_addr;
2221 * Number of bytes in @e udp_addr.
2223 size_t udp_addr_len;
2229 * Scan the heap for a receive context with the given address.
2231 * @param cls the `struct FindReceiveContext`
2232 * @param node internal node of the heap
2233 * @param element value stored at the node (a `struct ReceiveContext`)
2234 * @param cost cost associated with the node
2235 * @return #GNUNET_YES if we should continue to iterate,
2236 * #GNUNET_NO if not.
2239 find_receive_context (void *cls,
2240 struct GNUNET_CONTAINER_HeapNode *node,
2242 GNUNET_CONTAINER_HeapCostType cost)
2244 struct FindReceiveContext *frc = cls;
2245 struct DefragContext *e = element;
2247 if ( (frc->udp_addr_len == e->udp_addr_len) &&
2248 (0 == memcmp (frc->udp_addr,
2250 frc->udp_addr_len)) )
2260 * Functions with this signature are called whenever we need to close
2261 * a session due to a disconnect or failure to establish a connection.
2263 * @param cls closure with the `struct Plugin`
2264 * @param s session to close down
2265 * @return #GNUNET_OK on success
2268 udp_disconnect_session (void *cls,
2269 struct GNUNET_ATS_Session *s)
2271 struct Plugin *plugin = cls;
2272 struct UDP_MessageWrapper *udpw;
2273 struct UDP_MessageWrapper *next;
2274 struct FindReceiveContext frc;
2276 GNUNET_assert (GNUNET_YES != s->in_destroy);
2277 LOG (GNUNET_ERROR_TYPE_DEBUG,
2278 "Session %p to peer `%s' at address %s ended\n",
2280 GNUNET_i2s (&s->target),
2281 udp_address_to_string (plugin,
2282 s->address->address,
2283 s->address->address_length));
2284 if (NULL != s->timeout_task)
2286 GNUNET_SCHEDULER_cancel (s->timeout_task);
2287 s->timeout_task = NULL;
2289 if (NULL != s->frag_ctx)
2291 /* Remove fragmented message due to disconnect */
2292 fragmented_message_done (s->frag_ctx,
2295 GNUNET_assert (GNUNET_YES ==
2296 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
2300 frc.udp_addr = s->address->address;
2301 frc.udp_addr_len = s->address->address_length;
2302 /* Lookup existing receive context for this address */
2303 if (NULL != plugin->defrag_ctxs)
2305 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2306 &find_receive_context,
2310 struct DefragContext *d_ctx = frc.rc;
2312 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
2313 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2314 GNUNET_free (d_ctx);
2317 s->in_destroy = GNUNET_YES;
2318 next = plugin->ipv4_queue_head;
2319 while (NULL != (udpw = next))
2322 if (udpw->session == s)
2326 udpw->qc (udpw->qc_cls,
2332 next = plugin->ipv6_queue_head;
2333 while (NULL != (udpw = next))
2336 if (udpw->session == s)
2340 udpw->qc (udpw->qc_cls,
2346 if ( (NULL != s->frag_ctx) &&
2347 (NULL != s->frag_ctx->cont) )
2349 /* The 'frag_ctx' itself will be freed in #free_session() a bit
2350 later, as it might be in use right now */
2351 LOG (GNUNET_ERROR_TYPE_DEBUG,
2352 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
2353 GNUNET_i2s (&s->target));
2354 s->frag_ctx->cont (s->frag_ctx->cont_cls,
2357 s->frag_ctx->payload_size,
2358 s->frag_ctx->on_wire_size);
2360 notify_session_monitor (s->plugin,
2362 GNUNET_TRANSPORT_SS_DONE);
2363 plugin->env->session_end (plugin->env->cls,
2366 GNUNET_STATISTICS_set (plugin->env->stats,
2367 "# UDP sessions active",
2368 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2377 * Handle a #GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK message.
2379 * @param plugin the UDP plugin
2380 * @param msg the (presumed) UDP ACK message
2381 * @param udp_addr sender address
2382 * @param udp_addr_len number of bytes in @a udp_addr
2385 read_process_ack (struct Plugin *plugin,
2386 const struct GNUNET_MessageHeader *msg,
2387 const union UdpAddress *udp_addr,
2388 socklen_t udp_addr_len)
2390 const struct GNUNET_MessageHeader *ack;
2391 const struct UDP_ACK_Message *udp_ack;
2392 struct GNUNET_HELLO_Address *address;
2393 struct GNUNET_ATS_Session *s;
2394 struct GNUNET_TIME_Relative flow_delay;
2396 /* check message format */
2397 if (ntohs (msg->size)
2398 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2400 GNUNET_break_op (0);
2403 udp_ack = (const struct UDP_ACK_Message *) msg;
2404 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2405 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2411 /* Locate session */
2412 address = GNUNET_HELLO_address_allocate (&udp_ack->sender,
2416 GNUNET_HELLO_ADDRESS_INFO_NONE);
2417 s = udp_plugin_lookup_session (plugin,
2421 LOG (GNUNET_ERROR_TYPE_WARNING,
2422 "UDP session of address %s for ACK not found\n",
2423 udp_address_to_string (plugin,
2425 address->address_length));
2426 GNUNET_HELLO_address_free (address);
2429 if (NULL == s->frag_ctx)
2431 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2432 "Fragmentation context of address %s for ACK (%s) not found\n",
2433 udp_address_to_string (plugin,
2435 address->address_length),
2436 GNUNET_FRAGMENT_print_ack (ack));
2437 GNUNET_HELLO_address_free (address);
2440 GNUNET_HELLO_address_free (address);
2442 /* evaluate flow delay: how long should we wait between messages? */
2443 if (UINT32_MAX == ntohl (udp_ack->delay))
2445 /* Other peer asked for us to terminate the session */
2446 LOG (GNUNET_ERROR_TYPE_INFO,
2447 "Asked to disconnect UDP session of %s\n",
2448 GNUNET_i2s (&udp_ack->sender));
2449 udp_disconnect_session (plugin,
2453 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2454 if (flow_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
2455 LOG (GNUNET_ERROR_TYPE_WARNING,
2456 "We received a sending delay of %s for %s\n",
2457 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2459 GNUNET_i2s (&udp_ack->sender));
2461 LOG (GNUNET_ERROR_TYPE_DEBUG,
2462 "We received a sending delay of %s for %s\n",
2463 GNUNET_STRINGS_relative_time_to_string (flow_delay,
2465 GNUNET_i2s (&udp_ack->sender));
2466 /* Flow delay is for the reassembled packet, however, our delay
2467 is per packet, so we need to adjust: */
2468 s->flow_delay_from_other_peer = flow_delay;
2472 GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag,
2475 LOG (GNUNET_ERROR_TYPE_DEBUG,
2476 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2477 (unsigned int) ntohs (msg->size),
2478 GNUNET_i2s (&udp_ack->sender),
2479 udp_address_to_string (plugin,
2482 /* Expect more ACKs to arrive */
2486 /* Remove fragmented message after successful sending */
2487 LOG (GNUNET_ERROR_TYPE_DEBUG,
2488 "Message from %s at %s full ACK'ed\n",
2489 GNUNET_i2s (&udp_ack->sender),
2490 udp_address_to_string (plugin,
2493 fragmented_message_done (s->frag_ctx,
2499 * Message tokenizer has broken up an incomming message. Pass it on
2502 * @param cls the `struct Plugin *`
2503 * @param client the `struct GNUNET_ATS_Session *`
2504 * @param hdr the actual message
2505 * @return #GNUNET_OK (always)
2508 process_inbound_tokenized_messages (void *cls,
2510 const struct GNUNET_MessageHeader *hdr)
2512 struct Plugin *plugin = cls;
2513 struct GNUNET_ATS_Session *session = client;
2515 if (GNUNET_YES == session->in_destroy)
2517 reschedule_session_timeout (session);
2518 session->flow_delay_for_other_peer
2519 = plugin->env->receive (plugin->env->cls,
2528 * Destroy a session, plugin is being unloaded.
2530 * @param cls the `struct Plugin`
2531 * @param key hash of public key of target peer
2532 * @param value a `struct PeerSession *` to clean up
2533 * @return #GNUNET_OK (continue to iterate)
2536 disconnect_and_free_it (void *cls,
2537 const struct GNUNET_PeerIdentity *key,
2540 struct Plugin *plugin = cls;
2542 udp_disconnect_session (plugin,
2549 * Disconnect from a remote node. Clean up session if we have one for
2552 * @param cls closure for this call (should be handle to Plugin)
2553 * @param target the peeridentity of the peer to disconnect
2554 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
2557 udp_disconnect (void *cls,
2558 const struct GNUNET_PeerIdentity *target)
2560 struct Plugin *plugin = cls;
2562 LOG (GNUNET_ERROR_TYPE_DEBUG,
2563 "Disconnecting from peer `%s'\n",
2564 GNUNET_i2s (target));
2565 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
2567 &disconnect_and_free_it,
2573 * Session was idle, so disconnect it.
2575 * @param cls the `struct GNUNET_ATS_Session` to time out
2578 session_timeout (void *cls)
2580 struct GNUNET_ATS_Session *s = cls;
2581 struct Plugin *plugin = s->plugin;
2582 struct GNUNET_TIME_Relative left;
2584 s->timeout_task = NULL;
2585 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
2586 if (left.rel_value_us > 0)
2588 /* not actually our turn yet, but let's at least update
2589 the monitor, it may think we're about to die ... */
2590 notify_session_monitor (s->plugin,
2592 GNUNET_TRANSPORT_SS_UPDATE);
2593 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
2598 LOG (GNUNET_ERROR_TYPE_DEBUG,
2599 "Session %p was idle for %s, disconnecting\n",
2601 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
2603 /* call session destroy function */
2604 udp_disconnect_session (plugin,
2610 * Allocate a new session for the given endpoint address.
2611 * Note that this function does not inform the service
2612 * of the new session, this is the responsibility of the
2613 * caller (if needed).
2615 * @param cls the `struct Plugin`
2616 * @param address address of the other peer to use
2617 * @param network_type network type the address belongs to
2618 * @return NULL on error, otherwise session handle
2620 static struct GNUNET_ATS_Session *
2621 udp_plugin_create_session (void *cls,
2622 const struct GNUNET_HELLO_Address *address,
2623 enum GNUNET_ATS_Network_Type network_type)
2625 struct Plugin *plugin = cls;
2626 struct GNUNET_ATS_Session *s;
2628 s = GNUNET_new (struct GNUNET_ATS_Session);
2630 s->address = GNUNET_HELLO_address_copy (address);
2631 s->target = address->peer;
2632 s->last_transmit_time = GNUNET_TIME_absolute_get ();
2633 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2635 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
2636 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
2637 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
2638 s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT);
2639 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
2642 s->scope = network_type;
2644 LOG (GNUNET_ERROR_TYPE_DEBUG,
2645 "Creating new session %p for peer `%s' address `%s'\n",
2647 GNUNET_i2s (&address->peer),
2648 udp_address_to_string (plugin,
2650 address->address_length));
2651 GNUNET_assert (GNUNET_OK ==
2652 GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
2655 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
2656 GNUNET_STATISTICS_set (plugin->env->stats,
2657 "# UDP sessions active",
2658 GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
2660 notify_session_monitor (plugin,
2662 GNUNET_TRANSPORT_SS_INIT);
2668 * Creates a new outbound session the transport service will use to
2669 * send data to the peer.
2671 * @param cls the `struct Plugin *`
2672 * @param address the address
2673 * @return the session or NULL of max connections exceeded
2675 static struct GNUNET_ATS_Session *
2676 udp_plugin_get_session (void *cls,
2677 const struct GNUNET_HELLO_Address *address)
2679 struct Plugin *plugin = cls;
2680 struct GNUNET_ATS_Session *s;
2681 enum GNUNET_ATS_Network_Type network_type = GNUNET_ATS_NET_UNSPECIFIED;
2682 const struct IPv4UdpAddress *udp_v4;
2683 const struct IPv6UdpAddress *udp_v6;
2685 if (NULL == address)
2690 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
2691 (address->address_length != sizeof(struct IPv6UdpAddress)) )
2693 GNUNET_break_op (0);
2696 if (NULL != (s = udp_plugin_lookup_session (cls,
2700 /* need to create new session */
2701 if (sizeof (struct IPv4UdpAddress) == address->address_length)
2703 struct sockaddr_in v4;
2705 udp_v4 = (const struct IPv4UdpAddress *) address->address;
2706 memset (&v4, '\0', sizeof (v4));
2707 v4.sin_family = AF_INET;
2708 #if HAVE_SOCKADDR_IN_SIN_LEN
2709 v4.sin_len = sizeof (struct sockaddr_in);
2711 v4.sin_port = udp_v4->u4_port;
2712 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
2713 network_type = plugin->env->get_address_type (plugin->env->cls,
2714 (const struct sockaddr *) &v4,
2717 if (sizeof (struct IPv6UdpAddress) == address->address_length)
2719 struct sockaddr_in6 v6;
2721 udp_v6 = (const struct IPv6UdpAddress *) address->address;
2722 memset (&v6, '\0', sizeof (v6));
2723 v6.sin6_family = AF_INET6;
2724 #if HAVE_SOCKADDR_IN_SIN_LEN
2725 v6.sin6_len = sizeof (struct sockaddr_in6);
2727 v6.sin6_port = udp_v6->u6_port;
2728 v6.sin6_addr = udp_v6->ipv6_addr;
2729 network_type = plugin->env->get_address_type (plugin->env->cls,
2730 (const struct sockaddr *) &v6,
2733 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2734 return udp_plugin_create_session (cls,
2741 * We've received a UDP Message. Process it (pass contents to main service).
2743 * @param plugin plugin context
2744 * @param msg the message
2745 * @param udp_addr sender address
2746 * @param udp_addr_len number of bytes in @a udp_addr
2747 * @param network_type network type the address belongs to
2750 process_udp_message (struct Plugin *plugin,
2751 const struct UDPMessage *msg,
2752 const union UdpAddress *udp_addr,
2753 size_t udp_addr_len,
2754 enum GNUNET_ATS_Network_Type network_type)
2756 struct GNUNET_ATS_Session *s;
2757 struct GNUNET_HELLO_Address *address;
2759 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
2760 if (0 != ntohl (msg->reserved))
2765 if (ntohs (msg->header.size)
2766 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2772 address = GNUNET_HELLO_address_allocate (&msg->sender,
2776 GNUNET_HELLO_ADDRESS_INFO_NONE);
2778 (s = udp_plugin_lookup_session (plugin,
2781 s = udp_plugin_create_session (plugin,
2784 plugin->env->session_start (plugin->env->cls,
2788 notify_session_monitor (plugin,
2790 GNUNET_TRANSPORT_SS_UP);
2792 GNUNET_free (address);
2795 GNUNET_SERVER_mst_receive (plugin->mst,
2797 (const char *) &msg[1],
2798 ntohs (msg->header.size) - sizeof(struct UDPMessage),
2802 if ( (0 == s->rc) &&
2803 (GNUNET_YES == s->in_destroy) )
2809 * Process a defragmented message.
2811 * @param cls the `struct DefragContext *`
2812 * @param msg the message
2815 fragment_msg_proc (void *cls,
2816 const struct GNUNET_MessageHeader *msg)
2818 struct DefragContext *dc = cls;
2819 const struct UDPMessage *um;
2821 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2823 GNUNET_break_op (0);
2826 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2828 GNUNET_break_op (0);
2831 um = (const struct UDPMessage *) msg;
2832 dc->sender = um->sender;
2833 dc->have_sender = GNUNET_YES;
2834 process_udp_message (dc->plugin,
2843 * We finished sending an acknowledgement. Update
2846 * @param cls the `struct Plugin`
2847 * @param udpw message queue entry of the ACK
2848 * @param result #GNUNET_OK if the transmission worked,
2849 * #GNUNET_SYSERR if we failed to send the ACK
2852 ack_message_sent (void *cls,
2853 struct UDP_MessageWrapper *udpw,
2856 struct Plugin *plugin = cls;
2858 if (GNUNET_OK == result)
2860 GNUNET_STATISTICS_update (plugin->env->stats,
2861 "# UDP, ACK messages sent",
2867 GNUNET_STATISTICS_update (plugin->env->stats,
2868 "# UDP, ACK transmissions failed",
2876 * Transmit an acknowledgement.
2878 * @param cls the `struct DefragContext *`
2879 * @param id message ID (unused)
2880 * @param msg ack to transmit
2883 ack_proc (void *cls,
2885 const struct GNUNET_MessageHeader *msg)
2887 struct DefragContext *rc = cls;
2888 struct Plugin *plugin = rc->plugin;
2889 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2890 struct UDP_ACK_Message *udp_ack;
2892 struct UDP_MessageWrapper *udpw;
2893 struct GNUNET_ATS_Session *s;
2894 struct GNUNET_HELLO_Address *address;
2896 if (GNUNET_NO == rc->have_sender)
2898 /* tried to defragment but never succeeded, hence will not ACK */
2899 /* This can happen if we just lost msgs */
2900 GNUNET_STATISTICS_update (plugin->env->stats,
2901 "# UDP, fragments discarded without ACK",
2906 address = GNUNET_HELLO_address_allocate (&rc->sender,
2910 GNUNET_HELLO_ADDRESS_INFO_NONE);
2911 s = udp_plugin_lookup_session (plugin,
2913 GNUNET_HELLO_address_free (address);
2916 LOG (GNUNET_ERROR_TYPE_ERROR,
2917 "Trying to transmit ACK to peer `%s' but no session found!\n",
2918 udp_address_to_string (plugin,
2921 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2922 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2924 GNUNET_STATISTICS_update (plugin->env->stats,
2925 "# UDP, ACK transmissions failed",
2930 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
2931 s->flow_delay_for_other_peer.rel_value_us)
2933 else if (s->flow_delay_for_other_peer.rel_value_us < UINT32_MAX)
2934 delay = s->flow_delay_for_other_peer.rel_value_us;
2936 delay = UINT32_MAX - 1; /* largest value we can communicate */
2937 LOG (GNUNET_ERROR_TYPE_DEBUG,
2938 "Sending ACK to `%s' including delay of %s\n",
2939 udp_address_to_string (plugin,
2942 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer,
2944 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2945 udpw->msg_size = msize;
2946 udpw->payload_size = 0;
2948 udpw->start_time = GNUNET_TIME_absolute_get ();
2949 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2950 udpw->msg_buf = (char *) &udpw[1];
2951 udpw->qc = &ack_message_sent;
2952 udpw->qc_cls = plugin;
2953 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2954 udp_ack->header.size = htons ((uint16_t) msize);
2955 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2956 udp_ack->delay = htonl (delay);
2957 udp_ack->sender = *plugin->env->my_identity;
2958 GNUNET_memcpy (&udp_ack[1],
2963 notify_session_monitor (plugin,
2965 GNUNET_TRANSPORT_SS_UPDATE);
2966 if (s->address->address_length == sizeof (struct IPv4UdpAddress))
2967 schedule_select_v4 (plugin);
2969 schedule_select_v6 (plugin);
2974 * We received a fragment, process it.
2976 * @param plugin our plugin
2977 * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT
2978 * @param udp_addr sender address
2979 * @param udp_addr_len number of bytes in @a udp_addr
2980 * @param network_type network type the address belongs to
2983 read_process_fragment (struct Plugin *plugin,
2984 const struct GNUNET_MessageHeader *msg,
2985 const union UdpAddress *udp_addr,
2986 size_t udp_addr_len,
2987 enum GNUNET_ATS_Network_Type network_type)
2989 struct DefragContext *d_ctx;
2990 struct GNUNET_TIME_Absolute now;
2991 struct FindReceiveContext frc;
2994 frc.udp_addr = udp_addr;
2995 frc.udp_addr_len = udp_addr_len;
2997 /* Lookup existing receive context for this address */
2998 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2999 &find_receive_context,
3001 now = GNUNET_TIME_absolute_get ();
3006 /* Create a new defragmentation context */
3007 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + udp_addr_len);
3008 GNUNET_memcpy (&d_ctx[1],
3011 d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1];
3012 d_ctx->udp_addr_len = udp_addr_len;
3013 d_ctx->network_type = network_type;
3014 d_ctx->plugin = plugin;
3015 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
3017 UDP_MAX_MESSAGES_IN_DEFRAG,
3021 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs,
3023 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3024 LOG (GNUNET_ERROR_TYPE_DEBUG,
3025 "Created new defragmentation context for %u-byte fragment from `%s'\n",
3026 (unsigned int) ntohs (msg->size),
3027 udp_address_to_string (plugin,
3033 LOG (GNUNET_ERROR_TYPE_DEBUG,
3034 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
3035 (unsigned int) ntohs (msg->size),
3036 udp_address_to_string (plugin,
3042 GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag,
3045 /* keep this 'rc' from expiring */
3046 GNUNET_CONTAINER_heap_update_cost (d_ctx->hnode,
3047 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
3049 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
3050 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
3052 /* remove 'rc' that was inactive the longest */
3053 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
3054 GNUNET_assert (NULL != d_ctx);
3055 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3056 GNUNET_free (d_ctx);
3057 GNUNET_STATISTICS_update (plugin->env->stats,
3058 "# UDP, Defragmentations aborted",
3066 * Read and process a message from the given socket.
3068 * @param plugin the overall plugin
3069 * @param rsock socket to read from
3072 udp_select_read (struct Plugin *plugin,
3073 struct GNUNET_NETWORK_Handle *rsock)
3076 struct sockaddr_storage addr;
3077 char buf[65536] GNUNET_ALIGN;
3079 const struct GNUNET_MessageHeader *msg;
3080 struct IPv4UdpAddress v4;
3081 struct IPv6UdpAddress v6;
3082 const struct sockaddr *sa;
3083 const struct sockaddr_in *sa4;
3084 const struct sockaddr_in6 *sa6;
3085 const union UdpAddress *int_addr;
3086 size_t int_addr_len;
3087 enum GNUNET_ATS_Network_Type network_type;
3089 fromlen = sizeof (addr);
3093 size = GNUNET_NETWORK_socket_recvfrom (rsock,
3096 (struct sockaddr *) &addr,
3098 sa = (const struct sockaddr *) &addr;
3100 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
3101 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
3102 * on this socket has failed.
3104 * WSAECONNRESET - The virtual circuit was reset by the remote side
3105 * executing a hard or abortive close. The application should close
3106 * the socket; it is no longer usable. On a UDP-datagram socket this
3107 * error indicates a previous send operation resulted in an ICMP Port
3108 * Unreachable message.
3110 if ( (-1 == size) &&
3111 (ECONNRESET == errno) )
3116 LOG (GNUNET_ERROR_TYPE_DEBUG,
3117 "UDP failed to receive data: %s\n",
3119 /* Connection failure or something. Not a protocol violation. */
3123 /* Check if this is a STUN packet */
3125 GNUNET_NAT_stun_handle_packet (plugin->nat,
3126 (const struct sockaddr *) &addr,
3130 return; /* was STUN, do not process further */
3132 if (size < sizeof(struct GNUNET_MessageHeader))
3134 LOG (GNUNET_ERROR_TYPE_WARNING,
3135 "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n",
3136 (unsigned int ) size,
3139 /* _MAY_ be a connection failure (got partial message) */
3140 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
3141 GNUNET_break_op (0);
3145 msg = (const struct GNUNET_MessageHeader *) buf;
3146 LOG (GNUNET_ERROR_TYPE_DEBUG,
3147 "UDP received %u-byte message from `%s' type %u\n",
3148 (unsigned int) size,
3152 if (size != ntohs (msg->size))
3154 LOG (GNUNET_ERROR_TYPE_WARNING,
3155 "UDP malformed message (size %u) header from %s\n",
3156 (unsigned int) size,
3159 GNUNET_break_op (0);
3162 GNUNET_STATISTICS_update (plugin->env->stats,
3163 "# UDP, total bytes received",
3166 network_type = plugin->env->get_address_type (plugin->env->cls,
3169 switch (sa->sa_family)
3172 sa4 = (const struct sockaddr_in *) &addr;
3174 v4.ipv4_addr = sa4->sin_addr.s_addr;
3175 v4.u4_port = sa4->sin_port;
3176 int_addr = (union UdpAddress *) &v4;
3177 int_addr_len = sizeof (v4);
3180 sa6 = (const struct sockaddr_in6 *) &addr;
3182 v6.ipv6_addr = sa6->sin6_addr;
3183 v6.u6_port = sa6->sin6_port;
3184 int_addr = (union UdpAddress *) &v6;
3185 int_addr_len = sizeof (v6);
3192 switch (ntohs (msg->type))
3194 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
3195 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
3196 udp_broadcast_receive (plugin,
3203 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
3204 if (ntohs (msg->size) < sizeof(struct UDPMessage))
3209 process_udp_message (plugin,
3210 (const struct UDPMessage *) msg,
3215 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
3216 read_process_ack (plugin,
3221 case GNUNET_MESSAGE_TYPE_FRAGMENT:
3222 read_process_fragment (plugin,
3236 * Removes messages from the transmission queue that have
3237 * timed out, and then selects a message that should be
3240 * @param plugin the UDP plugin
3241 * @param sock which socket should we process the queue for (v4 or v6)
3242 * @return message selected for transmission, or NULL for none
3244 static struct UDP_MessageWrapper *
3245 remove_timeout_messages_and_select (struct Plugin *plugin,
3246 struct GNUNET_NETWORK_Handle *sock)
3248 struct UDP_MessageWrapper *udpw;
3249 struct GNUNET_TIME_Relative remaining;
3250 struct GNUNET_ATS_Session *session;
3253 removed = GNUNET_NO;
3254 udpw = (sock == plugin->sockv4)
3255 ? plugin->ipv4_queue_head
3256 : plugin->ipv6_queue_head;
3257 while (NULL != udpw)
3259 session = udpw->session;
3260 /* Find messages with timeout */
3261 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
3262 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
3264 /* Message timed out */
3265 removed = GNUNET_YES;
3268 udpw->qc (udpw->qc_cls,
3273 if (sock == plugin->sockv4)
3275 udpw = plugin->ipv4_queue_head;
3277 else if (sock == plugin->sockv6)
3279 udpw = plugin->ipv6_queue_head;
3283 GNUNET_break (0); /* should never happen */
3286 GNUNET_STATISTICS_update (plugin->env->stats,
3287 "# messages discarded due to timeout",
3293 /* Message did not time out, check transmission time */
3294 remaining = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time);
3295 if (0 == remaining.rel_value_us)
3297 /* this message is not delayed */
3298 LOG (GNUNET_ERROR_TYPE_DEBUG,
3299 "Message for peer `%s' (%u bytes) is not delayed \n",
3300 GNUNET_i2s (&udpw->session->target),
3301 udpw->payload_size);
3302 break; /* Found message to send, break */
3306 /* Message is delayed, try next */
3307 LOG (GNUNET_ERROR_TYPE_DEBUG,
3308 "Message for peer `%s' (%u bytes) is delayed for %s\n",
3309 GNUNET_i2s (&udpw->session->target),
3311 GNUNET_STRINGS_relative_time_to_string (remaining,
3317 if (GNUNET_YES == removed)
3318 notify_session_monitor (session->plugin,
3320 GNUNET_TRANSPORT_SS_UPDATE);
3326 * We failed to transmit a message via UDP. Generate
3327 * a descriptive error message.
3329 * @param plugin our plugin
3330 * @param sa target address we were trying to reach
3331 * @param slen number of bytes in @a sa
3332 * @param error the errno value returned from the sendto() call
3335 analyze_send_error (struct Plugin *plugin,
3336 const struct sockaddr *sa,
3340 enum GNUNET_ATS_Network_Type type;
3342 type = plugin->env->get_address_type (plugin->env->cls,
3345 if ( ( (GNUNET_ATS_NET_LAN == type) ||
3346 (GNUNET_ATS_NET_WAN == type) ) &&
3347 ( (ENETUNREACH == errno) ||
3348 (ENETDOWN == errno) ) )
3350 if (slen == sizeof (struct sockaddr_in))
3352 /* IPv4: "Network unreachable" or "Network down"
3354 * This indicates we do not have connectivity
3356 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3357 _("UDP could not transmit message to `%s': "
3358 "Network seems down, please check your network configuration\n"),
3362 if (slen == sizeof (struct sockaddr_in6))
3364 /* IPv6: "Network unreachable" or "Network down"
3366 * This indicates that this system is IPv6 enabled, but does not
3367 * have a valid global IPv6 address assigned or we do not have
3370 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
3371 _("UDP could not transmit IPv6 message! "
3372 "Please check your network configuration and disable IPv6 if your "
3373 "connection does not have a global IPv6 address\n"));
3378 LOG (GNUNET_ERROR_TYPE_WARNING,
3379 "UDP could not transmit message to `%s': `%s'\n",
3388 * It is time to try to transmit a UDP message. Select one
3391 * @param plugin the plugin
3392 * @param sock which socket (v4/v6) to send on
3395 udp_select_send (struct Plugin *plugin,
3396 struct GNUNET_NETWORK_Handle *sock)
3400 const struct sockaddr *a;
3401 const struct IPv4UdpAddress *u4;
3402 struct sockaddr_in a4;
3403 const struct IPv6UdpAddress *u6;
3404 struct sockaddr_in6 a6;
3405 struct UDP_MessageWrapper *udpw;
3407 /* Find message(s) to send */
3408 while (NULL != (udpw = remove_timeout_messages_and_select (plugin,
3411 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
3413 u4 = udpw->session->address->address;
3417 a4.sin_family = AF_INET;
3418 #if HAVE_SOCKADDR_IN_SIN_LEN
3419 a4.sin_len = sizeof (a4);
3421 a4.sin_port = u4->u4_port;
3422 a4.sin_addr.s_addr = u4->ipv4_addr;
3423 a = (const struct sockaddr *) &a4;
3426 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
3428 u6 = udpw->session->address->address;
3432 a6.sin6_family = AF_INET6;
3433 #if HAVE_SOCKADDR_IN_SIN_LEN
3434 a6.sin6_len = sizeof (a6);
3436 a6.sin6_port = u6->u6_port;
3437 a6.sin6_addr = u6->ipv6_addr;
3438 a = (const struct sockaddr *) &a6;
3446 udpw->qc (udpw->qc_cls,
3449 notify_session_monitor (plugin,
3451 GNUNET_TRANSPORT_SS_UPDATE);
3455 sent = GNUNET_NETWORK_socket_sendto (sock,
3460 udpw->session->last_transmit_time
3461 = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
3462 udpw->session->last_transmit_time);
3465 if (GNUNET_SYSERR == sent)
3468 analyze_send_error (plugin,
3472 udpw->qc (udpw->qc_cls,
3475 GNUNET_STATISTICS_update (plugin->env->stats,
3476 "# UDP, total, bytes, sent, failure",
3479 GNUNET_STATISTICS_update (plugin->env->stats,
3480 "# UDP, total, messages, sent, failure",
3487 LOG (GNUNET_ERROR_TYPE_DEBUG,
3488 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
3489 (unsigned int) (udpw->msg_size),
3490 GNUNET_i2s (&udpw->session->target),
3494 (sent < 0) ? STRERROR (errno) : "ok");
3495 GNUNET_STATISTICS_update (plugin->env->stats,
3496 "# UDP, total, bytes, sent, success",
3499 GNUNET_STATISTICS_update (plugin->env->stats,
3500 "# UDP, total, messages, sent, success",
3503 if (NULL != udpw->frag_ctx)
3504 udpw->frag_ctx->on_wire_size += udpw->msg_size;
3505 udpw->qc (udpw->qc_cls,
3509 notify_session_monitor (plugin,
3511 GNUNET_TRANSPORT_SS_UPDATE);
3517 /* ***************** Event loop (part 2) *************** */
3521 * We have been notified that our readset has something to read. We don't
3522 * know which socket needs to be read, so we have to check each one
3523 * Then reschedule this function to be called again once more is available.
3525 * @param cls the plugin handle
3528 udp_plugin_select_v4 (void *cls)
3530 struct Plugin *plugin = cls;
3531 const struct GNUNET_SCHEDULER_TaskContext *tc;
3533 plugin->select_task_v4 = NULL;
3534 if (NULL == plugin->sockv4)
3536 tc = GNUNET_SCHEDULER_get_task_context ();
3537 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3538 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3540 udp_select_read (plugin,
3542 udp_select_send (plugin,
3544 schedule_select_v4 (plugin);
3549 * We have been notified that our readset has something to read. We don't
3550 * know which socket needs to be read, so we have to check each one
3551 * Then reschedule this function to be called again once more is available.
3553 * @param cls the plugin handle
3556 udp_plugin_select_v6 (void *cls)
3558 struct Plugin *plugin = cls;
3559 const struct GNUNET_SCHEDULER_TaskContext *tc;
3561 plugin->select_task_v6 = NULL;
3562 if (NULL == plugin->sockv6)
3564 tc = GNUNET_SCHEDULER_get_task_context ();
3565 if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
3566 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3568 udp_select_read (plugin,
3571 udp_select_send (plugin,
3573 schedule_select_v6 (plugin);
3577 /* ******************* Initialization *************** */
3581 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
3583 * @param plugin the plugin to initialize
3584 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
3585 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
3586 * @return number of sockets that were successfully bound
3589 setup_sockets (struct Plugin *plugin,
3590 const struct sockaddr_in6 *bind_v6,
3591 const struct sockaddr_in *bind_v4)
3594 unsigned int sockets_created = 0;
3595 struct sockaddr_in6 server_addrv6;
3596 struct sockaddr_in server_addrv4;
3597 const struct sockaddr *server_addr;
3598 const struct sockaddr *addrs[2];
3599 socklen_t addrlens[2];
3603 /* Create IPv6 socket */
3605 if (GNUNET_YES == plugin->enable_ipv6)
3607 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
3610 if (NULL == plugin->sockv6)
3612 LOG (GNUNET_ERROR_TYPE_INFO,
3613 _("Disabling IPv6 since it is not supported on this system!\n"));
3614 plugin->enable_ipv6 = GNUNET_NO;
3618 memset (&server_addrv6,
3620 sizeof(struct sockaddr_in6));
3621 #if HAVE_SOCKADDR_IN_SIN_LEN
3622 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
3624 server_addrv6.sin6_family = AF_INET6;
3625 if (NULL != bind_v6)
3626 server_addrv6.sin6_addr = bind_v6->sin6_addr;
3628 server_addrv6.sin6_addr = in6addr_any;
3630 if (0 == plugin->port) /* autodetect */
3631 server_addrv6.sin6_port
3632 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3636 server_addrv6.sin6_port = htons (plugin->port);
3637 addrlen = sizeof (struct sockaddr_in6);
3638 server_addr = (const struct sockaddr *) &server_addrv6;
3643 LOG(GNUNET_ERROR_TYPE_DEBUG,
3644 "Binding to IPv6 `%s'\n",
3645 GNUNET_a2s (server_addr,
3649 GNUNET_NETWORK_socket_bind (plugin->sockv6,
3654 if (0 != plugin->port)
3656 tries = 10; /* fail immediately */
3657 break; /* bind failed on specific port */
3660 server_addrv6.sin6_port
3661 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3668 GNUNET_NETWORK_socket_close (plugin->sockv6);
3669 plugin->enable_ipv6 = GNUNET_NO;
3670 plugin->sockv6 = NULL;
3674 plugin->port = ntohs (server_addrv6.sin6_port);
3676 if (NULL != plugin->sockv6)
3678 LOG (GNUNET_ERROR_TYPE_DEBUG,
3679 "IPv6 UDP socket created listinging at %s\n",
3680 GNUNET_a2s (server_addr,
3682 addrs[sockets_created] = server_addr;
3683 addrlens[sockets_created] = addrlen;
3688 LOG (GNUNET_ERROR_TYPE_WARNING,
3689 _("Failed to bind UDP socket to %s: %s\n"),
3690 GNUNET_a2s (server_addr,
3697 /* Create IPv4 socket */
3699 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
3702 if (NULL == plugin->sockv4)
3704 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
3706 LOG (GNUNET_ERROR_TYPE_INFO,
3707 _("Disabling IPv4 since it is not supported on this system!\n"));
3708 plugin->enable_ipv4 = GNUNET_NO;
3712 memset (&server_addrv4,
3714 sizeof(struct sockaddr_in));
3715 #if HAVE_SOCKADDR_IN_SIN_LEN
3716 server_addrv4.sin_len = sizeof (struct sockaddr_in);
3718 server_addrv4.sin_family = AF_INET;
3719 if (NULL != bind_v4)
3720 server_addrv4.sin_addr = bind_v4->sin_addr;
3722 server_addrv4.sin_addr.s_addr = INADDR_ANY;
3724 if (0 == plugin->port)
3726 server_addrv4.sin_port
3727 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3731 server_addrv4.sin_port = htons (plugin->port);
3733 addrlen = sizeof (struct sockaddr_in);
3734 server_addr = (const struct sockaddr *) &server_addrv4;
3739 LOG (GNUNET_ERROR_TYPE_DEBUG,
3740 "Binding to IPv4 `%s'\n",
3741 GNUNET_a2s (server_addr,
3746 GNUNET_NETWORK_socket_bind (plugin->sockv4,
3751 if (0 != plugin->port)
3753 tries = 10; /* fail */
3754 break; /* bind failed on specific port */
3758 server_addrv4.sin_port
3759 = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
3766 GNUNET_NETWORK_socket_close (plugin->sockv4);
3767 plugin->enable_ipv4 = GNUNET_NO;
3768 plugin->sockv4 = NULL;
3772 plugin->port = ntohs (server_addrv4.sin_port);
3775 if (NULL != plugin->sockv4)
3777 LOG (GNUNET_ERROR_TYPE_DEBUG,
3778 "IPv4 socket created on port %s\n",
3779 GNUNET_a2s (server_addr,
3781 addrs[sockets_created] = server_addr;
3782 addrlens[sockets_created] = addrlen;
3787 LOG (GNUNET_ERROR_TYPE_ERROR,
3788 _("Failed to bind UDP socket to %s: %s\n"),
3789 GNUNET_a2s (server_addr,
3795 if (0 == sockets_created)
3797 LOG (GNUNET_ERROR_TYPE_WARNING,
3798 _("Failed to open UDP sockets\n"));
3799 return 0; /* No sockets created, return */
3801 schedule_select_v4 (plugin);
3802 schedule_select_v6 (plugin);
3803 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3809 &udp_nat_port_map_callback,
3812 return sockets_created;
3817 * The exported method. Makes the core api available via a global and
3818 * returns the udp transport API.
3820 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3821 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3824 libgnunet_plugin_transport_udp_init (void *cls)
3826 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3827 struct GNUNET_TRANSPORT_PluginFunctions *api;
3829 unsigned long long port;
3830 unsigned long long aport;
3831 unsigned long long udp_max_bps;
3832 unsigned long long enable_v6;
3833 unsigned long long enable_broadcasting;
3834 unsigned long long enable_broadcasting_recv;
3835 char *bind4_address;
3836 char *bind6_address;
3837 struct GNUNET_TIME_Relative interval;
3838 struct sockaddr_in server_addrv4;
3839 struct sockaddr_in6 server_addrv6;
3844 if (NULL == env->receive)
3846 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3847 initialze the plugin or the API */
3848 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3850 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3851 api->address_to_string = &udp_address_to_string;
3852 api->string_to_address = &udp_string_to_address;
3856 /* Get port number: port == 0 : autodetect a port,
3857 * > 0 : use this port, not given : 2086 default */
3859 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3866 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3869 _("must be in [0,65535]"));
3873 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3880 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3883 _("must be in [0,65535]"));
3888 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3891 enable_v6 = GNUNET_NO;
3893 enable_v6 = GNUNET_YES;
3895 have_bind4 = GNUNET_NO;
3896 memset (&server_addrv4,
3898 sizeof (server_addrv4));
3900 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3905 LOG (GNUNET_ERROR_TYPE_DEBUG,
3906 "Binding UDP plugin to specific address: `%s'\n",
3908 if (1 != inet_pton (AF_INET,
3910 &server_addrv4.sin_addr))
3912 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3915 _("must be valid IPv4 address"));
3916 GNUNET_free (bind4_address);
3919 have_bind4 = GNUNET_YES;
3921 GNUNET_free_non_null (bind4_address);
3922 have_bind6 = GNUNET_NO;
3923 memset (&server_addrv6,
3925 sizeof (server_addrv6));
3927 GNUNET_CONFIGURATION_get_value_string (env->cfg,
3932 LOG (GNUNET_ERROR_TYPE_DEBUG,
3933 "Binding udp plugin to specific address: `%s'\n",
3935 if (1 != inet_pton (AF_INET6,
3937 &server_addrv6.sin6_addr))
3939 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
3942 _("must be valid IPv6 address"));
3943 GNUNET_free (bind6_address);
3946 have_bind6 = GNUNET_YES;
3948 GNUNET_free_non_null (bind6_address);
3950 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3953 if (enable_broadcasting == GNUNET_SYSERR)
3954 enable_broadcasting = GNUNET_NO;
3956 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3958 "BROADCAST_RECEIVE");
3959 if (enable_broadcasting_recv == GNUNET_SYSERR)
3960 enable_broadcasting_recv = GNUNET_YES;
3962 if (GNUNET_SYSERR ==
3963 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3965 "BROADCAST_INTERVAL",
3968 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
3972 GNUNET_CONFIGURATION_get_value_number (env->cfg,
3977 /* 50 MB/s == infinity for practical purposes */
3978 udp_max_bps = 1024 * 1024 * 50;
3981 p = GNUNET_new (struct Plugin);
3984 p->broadcast_interval = interval;
3985 p->enable_ipv6 = enable_v6;
3986 p->enable_ipv4 = GNUNET_YES; /* default */
3987 p->enable_broadcasting = enable_broadcasting;
3988 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3990 p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
3992 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3993 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages,
3995 GNUNET_BANDWIDTH_tracker_init (&p->tracker,
3998 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps),
4000 res = setup_sockets (p,
4001 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
4002 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
4004 ( (NULL == p->sockv4) &&
4005 (NULL == p->sockv6) ) )
4007 LOG (GNUNET_ERROR_TYPE_ERROR,
4008 _("Failed to create UDP network sockets\n"));
4009 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
4010 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
4011 GNUNET_SERVER_mst_destroy (p->mst);
4013 GNUNET_NAT_unregister (p->nat);
4018 /* Setup broadcasting and receiving beacons */
4023 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
4025 api->disconnect_session = &udp_disconnect_session;
4026 api->query_keepalive_factor = &udp_query_keepalive_factor;
4027 api->disconnect_peer = &udp_disconnect;
4028 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
4029 api->address_to_string = &udp_address_to_string;
4030 api->string_to_address = &udp_string_to_address;
4031 api->check_address = &udp_plugin_check_address;
4032 api->get_session = &udp_plugin_get_session;
4033 api->send = &udp_plugin_send;
4034 api->get_network = &udp_plugin_get_network;
4035 api->get_network_for_address = &udp_plugin_get_network_for_address;
4036 api->update_session_timeout = &udp_plugin_update_session_timeout;
4037 api->setup_monitor = &udp_plugin_setup_monitor;
4043 * Function called on each entry in the defragmentation heap to
4047 * @param node node in the heap (to be removed)
4048 * @param element a `struct DefragContext` to be cleaned up
4049 * @param cost unused
4050 * @return #GNUNET_YES
4053 heap_cleanup_iterator (void *cls,
4054 struct GNUNET_CONTAINER_HeapNode *node,
4056 GNUNET_CONTAINER_HeapCostType cost)
4058 struct DefragContext *d_ctx = element;
4060 GNUNET_CONTAINER_heap_remove_node (node);
4061 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
4062 GNUNET_free (d_ctx);
4068 * The exported method. Makes the core api available via a global and
4069 * returns the udp transport API.
4071 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
4075 libgnunet_plugin_transport_udp_done (void *cls)
4077 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
4078 struct Plugin *plugin = api->cls;
4079 struct PrettyPrinterContext *cur;
4080 struct UDP_MessageWrapper *udpw;
4087 stop_broadcast (plugin);
4088 if (NULL != plugin->select_task_v4)
4090 GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
4091 plugin->select_task_v4 = NULL;
4093 if (NULL != plugin->select_task_v6)
4095 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
4096 plugin->select_task_v6 = NULL;
4098 if (NULL != plugin->sockv4)
4100 GNUNET_break (GNUNET_OK ==
4101 GNUNET_NETWORK_socket_close (plugin->sockv4));
4102 plugin->sockv4 = NULL;
4104 if (NULL != plugin->sockv6)
4106 GNUNET_break (GNUNET_OK ==
4107 GNUNET_NETWORK_socket_close (plugin->sockv6));
4108 plugin->sockv6 = NULL;
4110 if (NULL != plugin->nat)
4112 GNUNET_NAT_unregister (plugin->nat);
4115 if (NULL != plugin->defrag_ctxs)
4117 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
4118 &heap_cleanup_iterator,
4120 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
4121 plugin->defrag_ctxs = NULL;
4123 if (NULL != plugin->mst)
4125 GNUNET_SERVER_mst_destroy (plugin->mst);
4128 while (NULL != (udpw = plugin->ipv4_queue_head))
4132 udpw->qc (udpw->qc_cls,
4137 while (NULL != (udpw = plugin->ipv6_queue_head))
4141 udpw->qc (udpw->qc_cls,
4146 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
4147 &disconnect_and_free_it,
4149 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
4151 while (NULL != (cur = plugin->ppc_dll_head))
4154 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
4155 plugin->ppc_dll_tail,
4157 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
4158 if (NULL != cur->timeout_task)
4160 GNUNET_SCHEDULER_cancel (cur->timeout_task);
4161 cur->timeout_task = NULL;
4165 GNUNET_free (plugin);
4170 /* end of plugin_transport_udp.c */