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3 (C) 2010, 2011 Christian Grothoff (and other contributing authors)
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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__)
47 * Number of messages we can defragment in parallel. We only really
48 * defragment 1 message at a time, but if messages get re-ordered, we
49 * may want to keep knowledge about the previous message to avoid
50 * discarding the current message in favor of a single fragment of a
51 * previous message. 3 should be good since we don't expect massive
52 * message reorderings with UDP.
54 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
57 * We keep a defragmentation queue per sender address. How many
58 * sender addresses do we support at the same time? Memory consumption
59 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
60 * value. (So 128 corresponds to 12 MB and should suffice for
61 * connecting to roughly 128 peers via UDP).
63 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
68 * Closure for 'append_port'.
70 struct PrettyPrinterContext
73 * Function to call with the result.
75 GNUNET_TRANSPORT_AddressStringCallback asc;
83 * Port to add after the IP address.
91 * Which peer is this session for?
93 struct GNUNET_PeerIdentity target;
96 * Address of the other peer
98 const struct sockaddr *sock_addr;
103 * Desired delay for next sending we send to other peer
105 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
108 * Desired delay for next sending we received from other peer
110 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
113 * expected delay for ACKs
115 struct GNUNET_TIME_Relative last_expected_delay;
118 struct GNUNET_ATS_Information ats;
120 struct FragmentationContext * frag_ctx;
124 struct SessionCompareContext
127 const struct GNUNET_HELLO_Address *addr;
132 * Closure for 'process_inbound_tokenized_messages'
134 struct SourceInformation
139 struct GNUNET_PeerIdentity sender;
147 * Number of bytes in source address.
151 struct Session *session;
156 * Closure for 'find_receive_context'.
158 struct FindReceiveContext
161 * Where to store the result.
163 struct DefragContext *rc;
168 const struct sockaddr *addr;
171 * Number of bytes in 'addr'.
175 struct Session *session;
181 * Data structure to track defragmentation contexts based
182 * on the source of the UDP traffic.
188 * Defragmentation context.
190 struct GNUNET_DEFRAGMENT_Context *defrag;
193 * Source address this receive context is for (allocated at the
194 * end of the struct).
196 const struct sockaddr *src_addr;
199 * Reference to master plugin struct.
201 struct Plugin *plugin;
204 * Node in the defrag heap.
206 struct GNUNET_CONTAINER_HeapNode *hnode;
209 * Length of 'src_addr'
217 * Closure for 'process_inbound_tokenized_messages'
219 struct FragmentationContext
221 struct FragmentationContext * next;
222 struct FragmentationContext * prev;
224 struct Plugin * plugin;
225 struct GNUNET_FRAGMENT_Context * frag;
226 struct Session * session;
228 struct GNUNET_TIME_Absolute timeout;
232 * Function to call upon completion of the transmission.
234 GNUNET_TRANSPORT_TransmitContinuation cont;
237 * Closure for 'cont'.
241 size_t bytes_to_send;
245 struct UDPMessageWrapper
247 struct Session *session;
248 struct UDPMessageWrapper *prev;
249 struct UDPMessageWrapper *next;
253 struct GNUNET_TIME_Absolute timeout;
256 * Function to call upon completion of the transmission.
258 GNUNET_TRANSPORT_TransmitContinuation cont;
261 * Closure for 'cont'.
265 struct FragmentationContext *frag_ctx;
271 * UDP ACK Message-Packet header (after defragmentation).
273 struct UDP_ACK_Message
278 struct GNUNET_MessageHeader header;
281 * Desired delay for flow control
286 * What is the identity of the sender
288 struct GNUNET_PeerIdentity sender;
293 * We have been notified that our readset has something to read. We don't
294 * know which socket needs to be read, so we have to check each one
295 * Then reschedule this function to be called again once more is available.
297 * @param cls the plugin handle
298 * @param tc the scheduling context (for rescheduling this function again)
301 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
304 * We have been notified that our readset has something to read. We don't
305 * know which socket needs to be read, so we have to check each one
306 * Then reschedule this function to be called again once more is available.
308 * @param cls the plugin handle
309 * @param tc the scheduling context (for rescheduling this function again)
312 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
315 * Function called for a quick conversion of the binary address to
316 * a numeric address. Note that the caller must not free the
317 * address and that the next call to this function is allowed
318 * to override the address again.
321 * @param addr binary address
322 * @param addrlen length of the address
323 * @return string representing the same address
326 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
328 static char rbuf[INET6_ADDRSTRLEN + 10];
329 char buf[INET6_ADDRSTRLEN];
333 const struct IPv4UdpAddress *t4;
334 const struct IPv6UdpAddress *t6;
338 if (addrlen == sizeof (struct IPv6UdpAddress))
342 port = ntohs (t6->u6_port);
343 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
346 else if (addrlen == sizeof (struct IPv4UdpAddress))
350 port = ntohs (t4->u4_port);
351 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
359 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
360 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
367 * Function called to convert a string address to
370 * @param cls closure ('struct Plugin*')
371 * @param addr string address
372 * @param addrlen length of the address
373 * @param buf location to store the buffer
374 * @param added location to store the number of bytes in the buffer.
375 * If the function returns GNUNET_SYSERR, its contents are undefined.
376 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
379 udp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
380 void **buf, size_t *added)
382 struct sockaddr_storage socket_address;
383 int ret = GNUNET_STRINGS_to_address_ip (addr, addrlen,
386 if (ret != GNUNET_OK)
387 return GNUNET_SYSERR;
389 if (socket_address.ss_family == AF_INET)
391 struct IPv4UdpAddress *u4;
392 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
393 u4 = GNUNET_malloc (sizeof (struct IPv4UdpAddress));
394 u4->ipv4_addr = in4->sin_addr.s_addr;
395 u4->u4_port = in4->sin_port;
397 *added = sizeof (struct IPv4UdpAddress);
399 else if (socket_address.ss_family == AF_INET6)
401 struct IPv6UdpAddress *u6;
402 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
403 u6 = GNUNET_malloc (sizeof (struct IPv6UdpAddress));
404 u6->ipv6_addr = in6->sin6_addr;
405 u6->u6_port = in6->sin6_port;
407 *added = sizeof (struct IPv6UdpAddress);
409 return GNUNET_SYSERR;
414 * Append our port and forward the result.
416 * @param cls a 'struct PrettyPrinterContext'
417 * @param hostname result from DNS resolver
420 append_port (void *cls, const char *hostname)
422 struct PrettyPrinterContext *ppc = cls;
425 if (hostname == NULL)
427 ppc->asc (ppc->asc_cls, NULL);
431 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
432 ppc->asc (ppc->asc_cls, ret);
438 * Convert the transports address to a nice, human-readable
442 * @param type name of the transport that generated the address
443 * @param addr one of the addresses of the host, NULL for the last address
444 * the specific address format depends on the transport
445 * @param addrlen length of the address
446 * @param numeric should (IP) addresses be displayed in numeric form?
447 * @param timeout after how long should we give up?
448 * @param asc function to call on each string
449 * @param asc_cls closure for asc
452 udp_plugin_address_pretty_printer (void *cls, const char *type,
453 const void *addr, size_t addrlen,
455 struct GNUNET_TIME_Relative timeout,
456 GNUNET_TRANSPORT_AddressStringCallback asc,
459 struct PrettyPrinterContext *ppc;
462 struct sockaddr_in a4;
463 struct sockaddr_in6 a6;
464 const struct IPv4UdpAddress *u4;
465 const struct IPv6UdpAddress *u6;
468 if (addrlen == sizeof (struct IPv6UdpAddress))
471 memset (&a6, 0, sizeof (a6));
472 a6.sin6_family = AF_INET6;
473 #if HAVE_SOCKADDR_IN_SIN_LEN
474 a6.sin6_len = sizeof (a6);
476 a6.sin6_port = u6->u6_port;
477 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
478 port = ntohs (u6->u6_port);
482 else if (addrlen == sizeof (struct IPv4UdpAddress))
485 memset (&a4, 0, sizeof (a4));
486 a4.sin_family = AF_INET;
487 #if HAVE_SOCKADDR_IN_SIN_LEN
488 a4.sin_len = sizeof (a4);
490 a4.sin_port = u4->u4_port;
491 a4.sin_addr.s_addr = u4->ipv4_addr;
492 port = ntohs (u4->u4_port);
498 /* invalid address */
503 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
505 ppc->asc_cls = asc_cls;
507 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
512 * Check if the given port is plausible (must be either our listen
513 * port or our advertised port). If it is neither, we return
516 * @param plugin global variables
517 * @param in_port port number to check
518 * @return GNUNET_OK if port is either open_port or adv_port
521 check_port (struct Plugin *plugin, uint16_t in_port)
523 if ((in_port == plugin->port) || (in_port == plugin->aport))
525 return GNUNET_SYSERR;
531 * Function that will be called to check if a binary address for this
532 * plugin is well-formed and corresponds to an address for THIS peer
533 * (as per our configuration). Naturally, if absolutely necessary,
534 * plugins can be a bit conservative in their answer, but in general
535 * plugins should make sure that the address does not redirect
536 * traffic to a 3rd party that might try to man-in-the-middle our
539 * @param cls closure, should be our handle to the Plugin
540 * @param addr pointer to the address
541 * @param addrlen length of addr
542 * @return GNUNET_OK if this is a plausible address for this peer
543 * and transport, GNUNET_SYSERR if not
547 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
549 struct Plugin *plugin = cls;
550 struct IPv4UdpAddress *v4;
551 struct IPv6UdpAddress *v6;
553 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
554 (addrlen != sizeof (struct IPv6UdpAddress)))
557 return GNUNET_SYSERR;
559 if (addrlen == sizeof (struct IPv4UdpAddress))
561 v4 = (struct IPv4UdpAddress *) addr;
562 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
563 return GNUNET_SYSERR;
565 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
566 sizeof (struct in_addr)))
567 return GNUNET_SYSERR;
571 v6 = (struct IPv6UdpAddress *) addr;
572 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
575 return GNUNET_SYSERR;
577 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
578 return GNUNET_SYSERR;
580 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
581 sizeof (struct in6_addr)))
582 return GNUNET_SYSERR;
589 * Destroy a session, plugin is being unloaded.
592 * @param key hash of public key of target peer
593 * @param value a 'struct PeerSession*' to clean up
594 * @return GNUNET_OK (continue to iterate)
597 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
599 struct Plugin *plugin = cls;
600 struct Session *s = value;
601 struct UDPMessageWrapper *udpw;
602 struct UDPMessageWrapper *next;
605 LOG (GNUNET_ERROR_TYPE_DEBUG,
606 "Session %p to peer `%s' address ended \n",
608 GNUNET_i2s (&s->target),
609 GNUNET_a2s (s->sock_addr, s->addrlen));
612 if (s->frag_ctx != NULL)
614 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
615 GNUNET_free (s->frag_ctx);
619 udpw = plugin->ipv4_queue_head;
623 if (udpw->session == s)
625 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
627 if (udpw->cont != NULL)
628 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
634 udpw = plugin->ipv6_queue_head;
638 if (udpw->session == s)
640 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
642 if (udpw->cont != NULL)
643 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
649 plugin->env->session_end (plugin->env->cls, &s->target, s);
651 GNUNET_assert (GNUNET_YES ==
652 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
653 &s->target.hashPubKey,
663 * Disconnect from a remote node. Clean up session if we have one for this peer
665 * @param cls closure for this call (should be handle to Plugin)
666 * @param target the peeridentity of the peer to disconnect
667 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
670 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
672 struct Plugin *plugin = cls;
673 GNUNET_assert (plugin != NULL);
675 GNUNET_assert (target != NULL);
677 LOG (GNUNET_ERROR_TYPE_DEBUG,
678 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
680 /* Clean up sessions */
681 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
684 static struct Session *
685 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
686 const void *addr, size_t addrlen,
687 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
690 const struct IPv4UdpAddress *t4;
691 const struct IPv6UdpAddress *t6;
692 struct sockaddr_in *v4;
693 struct sockaddr_in6 *v6;
698 case sizeof (struct IPv4UdpAddress):
699 if (NULL == plugin->sockv4)
704 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
705 len = sizeof (struct sockaddr_in);
706 v4 = (struct sockaddr_in *) &s[1];
707 v4->sin_family = AF_INET;
708 #if HAVE_SOCKADDR_IN_SIN_LEN
709 v4->sin_len = sizeof (struct sockaddr_in);
711 v4->sin_port = t4->u4_port;
712 v4->sin_addr.s_addr = t4->ipv4_addr;
713 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
715 case sizeof (struct IPv6UdpAddress):
716 if (NULL == plugin->sockv6)
722 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
723 len = sizeof (struct sockaddr_in6);
724 v6 = (struct sockaddr_in6 *) &s[1];
725 v6->sin6_family = AF_INET6;
726 #if HAVE_SOCKADDR_IN_SIN_LEN
727 v6->sin6_len = sizeof (struct sockaddr_in6);
729 v6->sin6_port = t6->u6_port;
730 v6->sin6_addr = t6->ipv6_addr;
731 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
734 /* Must have a valid address to send to */
741 s->sock_addr = (const struct sockaddr *) &s[1];
742 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
743 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
744 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
749 static int session_cmp_it (void *cls,
750 const GNUNET_HashCode * key,
753 struct SessionCompareContext * cctx = cls;
754 const struct GNUNET_HELLO_Address *address = cctx->addr;
755 struct Session *s = value;
757 socklen_t s_addrlen = s->addrlen;
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
761 udp_address_to_string (NULL, (void *) address->address, address->address_length),
762 GNUNET_a2s (s->sock_addr, s->addrlen));
765 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
766 (s_addrlen == sizeof (struct sockaddr_in)))
768 struct IPv4UdpAddress * u4 = NULL;
769 u4 = (struct IPv4UdpAddress *) address->address;
770 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
771 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
772 (u4->u4_port == s4->sin_port))
779 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
780 (s_addrlen == sizeof (struct sockaddr_in6)))
782 struct IPv6UdpAddress * u6 = NULL;
783 u6 = (struct IPv6UdpAddress *) address->address;
784 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
785 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
786 (u6->u6_port == s6->sin6_port))
799 * Creates a new outbound session the transport service will use to send data to the
802 * @param cls the plugin
803 * @param address the address
804 * @return the session or NULL of max connections exceeded
806 static struct Session *
807 udp_plugin_get_session (void *cls,
808 const struct GNUNET_HELLO_Address *address)
810 struct Session * s = NULL;
811 struct Plugin * plugin = cls;
812 struct IPv6UdpAddress * udp_a6;
813 struct IPv4UdpAddress * udp_a4;
815 GNUNET_assert (plugin != NULL);
816 GNUNET_assert (address != NULL);
819 if ((address->address == NULL) ||
820 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
821 (address->address_length != sizeof (struct IPv6UdpAddress))))
827 if (address->address_length == sizeof (struct IPv4UdpAddress))
829 if (plugin->sockv4 == NULL)
831 udp_a4 = (struct IPv4UdpAddress *) address->address;
832 if (udp_a4->u4_port == 0)
836 if (address->address_length == sizeof (struct IPv6UdpAddress))
838 if (plugin->sockv6 == NULL)
840 udp_a6 = (struct IPv6UdpAddress *) address->address;
841 if (udp_a6->u6_port == 0)
845 /* check if session already exists */
846 struct SessionCompareContext cctx;
850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking for existing session for peer `%s' `%s' \n", GNUNET_i2s (&address->peer), udp_address_to_string(NULL, address->address, address->address_length));
852 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
853 if (cctx.res != NULL)
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
861 /* otherwise create new */
862 s = create_session (plugin,
865 address->address_length,
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Creating new session %p for peer `%s' address `%s'\n",
871 GNUNET_i2s(&address->peer),
872 udp_address_to_string(NULL,address->address,address->address_length));
874 GNUNET_assert (GNUNET_OK ==
875 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
876 &s->target.hashPubKey,
878 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
883 static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
886 if (udpw->session->addrlen == sizeof (struct sockaddr_in))
887 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
888 if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
889 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
893 * Function that is called with messages created by the fragmentation
894 * module. In the case of the 'proc' callback of the
895 * GNUNET_FRAGMENT_context_create function, this function must
896 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
898 * @param cls closure, the 'struct FragmentationContext'
899 * @param msg the message that was created
902 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
904 struct FragmentationContext *frag_ctx = cls;
905 struct Plugin *plugin = frag_ctx->plugin;
906 struct UDPMessageWrapper * udpw;
909 size_t msg_len = ntohs (msg->size);
912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
915 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
916 udpw->session = frag_ctx->session;
918 udpw->udp = (char *) &udpw[1];
920 udpw->msg_size = msg_len;
921 udpw->cont = frag_ctx->cont;
922 udpw->cont_cls = frag_ctx->cont_cls;
923 udpw->timeout = frag_ctx->timeout;
924 udpw->frag_ctx = frag_ctx;
925 memcpy (udpw->udp, msg, msg_len);
927 enqueue (plugin, udpw);
930 if (s->addrlen == sizeof (struct sockaddr_in))
932 if (plugin->with_v4_ws == GNUNET_NO)
934 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
935 GNUNET_SCHEDULER_cancel(plugin->select_task);
937 plugin->select_task =
938 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
939 GNUNET_SCHEDULER_NO_TASK,
940 GNUNET_TIME_UNIT_FOREVER_REL,
943 &udp_plugin_select, plugin);
944 plugin->with_v4_ws = GNUNET_YES;
948 else if (s->addrlen == sizeof (struct sockaddr_in6))
950 if (plugin->with_v6_ws == GNUNET_NO)
952 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
953 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
955 plugin->select_task_v6 =
956 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
957 GNUNET_SCHEDULER_NO_TASK,
958 GNUNET_TIME_UNIT_FOREVER_REL,
961 &udp_plugin_select_v6, plugin);
962 plugin->with_v6_ws = GNUNET_YES;
972 * Function that can be used by the transport service to transmit
973 * a message using the plugin. Note that in the case of a
974 * peer disconnecting, the continuation MUST be called
975 * prior to the disconnect notification itself. This function
976 * will be called with this peer's HELLO message to initiate
977 * a fresh connection to another peer.
980 * @param s which session must be used
981 * @param msgbuf the message to transmit
982 * @param msgbuf_size number of bytes in 'msgbuf'
983 * @param priority how important is the message (most plugins will
984 * ignore message priority and just FIFO)
985 * @param to how long to wait at most for the transmission (does not
986 * require plugins to discard the message after the timeout,
987 * just advisory for the desired delay; most plugins will ignore
989 * @param cont continuation to call once the message has
990 * been transmitted (or if the transport is ready
991 * for the next transmission call; or if the
992 * peer disconnected...); can be NULL
993 * @param cont_cls closure for cont
994 * @return number of bytes used (on the physical network, with overheads);
995 * -1 on hard errors (i.e. address invalid); 0 is a legal value
996 * and does NOT mean that the message was not transmitted (DV)
999 udp_plugin_send (void *cls,
1001 const char *msgbuf, size_t msgbuf_size,
1002 unsigned int priority,
1003 struct GNUNET_TIME_Relative to,
1004 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1006 struct Plugin *plugin = cls;
1007 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
1009 struct UDPMessageWrapper * udpw;
1010 struct UDPMessage *udp;
1012 GNUNET_assert (plugin != NULL);
1013 GNUNET_assert (s != NULL);
1015 if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL))
1016 return GNUNET_SYSERR;
1018 if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL))
1019 return GNUNET_SYSERR;
1022 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1025 return GNUNET_SYSERR;
1028 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
1031 return GNUNET_SYSERR;
1034 LOG (GNUNET_ERROR_TYPE_DEBUG,
1035 "UDP transmits %u-byte message to `%s' using address `%s'\n",
1037 GNUNET_i2s (&s->target),
1038 GNUNET_a2s(s->sock_addr, s->addrlen));
1041 udp = (struct UDPMessage *) mbuf;
1042 udp->header.size = htons (mlen);
1043 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
1044 udp->reserved = htonl (0);
1045 udp->sender = *plugin->env->my_identity;
1047 if (mlen <= UDP_MTU)
1049 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
1051 udpw->udp = (char *) &udpw[1];
1052 udpw->msg_size = mlen;
1053 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1055 udpw->cont_cls = cont_cls;
1056 udpw->frag_ctx = NULL;
1058 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
1059 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
1061 enqueue (plugin, udpw);
1065 LOG (GNUNET_ERROR_TYPE_DEBUG,
1066 "UDP has to fragment message \n");
1067 if (s->frag_ctx != NULL)
1068 return GNUNET_SYSERR;
1069 memcpy (&udp[1], msgbuf, msgbuf_size);
1070 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
1072 frag_ctx->plugin = plugin;
1073 frag_ctx->session = s;
1074 frag_ctx->cont = cont;
1075 frag_ctx->cont_cls = cont_cls;
1076 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1077 frag_ctx->bytes_to_send = mlen;
1078 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
1081 s->last_expected_delay,
1086 s->frag_ctx = frag_ctx;
1090 if (s->addrlen == sizeof (struct sockaddr_in))
1092 if (plugin->with_v4_ws == GNUNET_NO)
1094 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1095 GNUNET_SCHEDULER_cancel(plugin->select_task);
1097 plugin->select_task =
1098 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1099 GNUNET_SCHEDULER_NO_TASK,
1100 GNUNET_TIME_UNIT_FOREVER_REL,
1103 &udp_plugin_select, plugin);
1104 plugin->with_v4_ws = GNUNET_YES;
1108 else if (s->addrlen == sizeof (struct sockaddr_in6))
1110 if (plugin->with_v6_ws == GNUNET_NO)
1112 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1113 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
1115 plugin->select_task_v6 =
1116 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1117 GNUNET_SCHEDULER_NO_TASK,
1118 GNUNET_TIME_UNIT_FOREVER_REL,
1121 &udp_plugin_select_v6, plugin);
1122 plugin->with_v6_ws = GNUNET_YES;
1131 * Our external IP address/port mapping has changed.
1133 * @param cls closure, the 'struct LocalAddrList'
1134 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1135 * the previous (now invalid) one
1136 * @param addr either the previous or the new public IP address
1137 * @param addrlen actual lenght of the address
1140 udp_nat_port_map_callback (void *cls, int add_remove,
1141 const struct sockaddr *addr, socklen_t addrlen)
1143 struct Plugin *plugin = cls;
1144 struct IPv4UdpAddress u4;
1145 struct IPv6UdpAddress u6;
1149 /* convert 'addr' to our internal format */
1150 switch (addr->sa_family)
1153 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1154 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1155 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1160 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1161 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1162 sizeof (struct in6_addr));
1163 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1171 /* modify our published address list */
1172 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1178 * Message tokenizer has broken up an incomming message. Pass it on
1181 * @param cls the 'struct Plugin'
1182 * @param client the 'struct SourceInformation'
1183 * @param hdr the actual message
1186 process_inbound_tokenized_messages (void *cls, void *client,
1187 const struct GNUNET_MessageHeader *hdr)
1189 struct Plugin *plugin = cls;
1190 struct SourceInformation *si = client;
1191 struct GNUNET_ATS_Information ats[2];
1192 struct GNUNET_TIME_Relative delay;
1194 GNUNET_assert (si->session != NULL);
1196 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1197 ats[0].value = htonl (1);
1198 ats[1] = si->session->ats;
1199 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1201 delay = plugin->env->receive (plugin->env->cls,
1204 (const struct GNUNET_ATS_Information *) &ats, 2,
1208 si->session->flow_delay_for_other_peer = delay;
1213 * We've received a UDP Message. Process it (pass contents to main service).
1215 * @param plugin plugin context
1216 * @param msg the message
1217 * @param sender_addr sender address
1218 * @param sender_addr_len number of bytes in sender_addr
1221 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1222 const struct sockaddr *sender_addr,
1223 socklen_t sender_addr_len)
1225 struct SourceInformation si;
1226 struct Session * s = NULL;
1227 struct IPv4UdpAddress u4;
1228 struct IPv6UdpAddress u6;
1232 if (0 != ntohl (msg->reserved))
1234 GNUNET_break_op (0);
1237 if (ntohs (msg->header.size) <
1238 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1240 GNUNET_break_op (0);
1244 /* convert address */
1245 switch (sender_addr->sa_family)
1248 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1249 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1250 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1255 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1256 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1257 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1266 LOG (GNUNET_ERROR_TYPE_DEBUG,
1267 "Received message with %u bytes from peer `%s' at `%s'\n",
1268 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1269 GNUNET_a2s (sender_addr, sender_addr_len));
1272 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1273 s = udp_plugin_get_session(plugin, address);
1274 GNUNET_free (address);
1276 /* iterate over all embedded messages */
1278 si.sender = msg->sender;
1282 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1283 ntohs (msg->header.size) -
1284 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1289 * Scan the heap for a receive context with the given address.
1291 * @param cls the 'struct FindReceiveContext'
1292 * @param node internal node of the heap
1293 * @param element value stored at the node (a 'struct ReceiveContext')
1294 * @param cost cost associated with the node
1295 * @return GNUNET_YES if we should continue to iterate,
1299 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1300 void *element, GNUNET_CONTAINER_HeapCostType cost)
1302 struct FindReceiveContext *frc = cls;
1303 struct DefragContext *e = element;
1305 if ((frc->addr_len == e->addr_len) &&
1306 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1316 * Process a defragmented message.
1318 * @param cls the 'struct ReceiveContext'
1319 * @param msg the message
1322 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1324 struct DefragContext *rc = cls;
1326 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1331 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1336 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1337 rc->src_addr, rc->addr_len);
1340 struct LookupContext
1342 const struct sockaddr * addr;
1345 struct Session *res;
1349 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1351 struct LookupContext *l_ctx = cls;
1352 struct Session * s = value;
1354 if ((s->addrlen == l_ctx->addrlen) &&
1355 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1364 * Transmit an acknowledgement.
1366 * @param cls the 'struct ReceiveContext'
1367 * @param id message ID (unused)
1368 * @param msg ack to transmit
1371 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1373 struct DefragContext *rc = cls;
1375 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1376 struct UDP_ACK_Message *udp_ack;
1378 struct UDPMessageWrapper *udpw;
1381 struct LookupContext l_ctx;
1382 l_ctx.addr = rc->src_addr;
1383 l_ctx.addrlen = rc->addr_len;
1385 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1386 &lookup_session_by_addr_it,
1390 GNUNET_assert (s != NULL);
1392 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1393 delay = s->flow_delay_for_other_peer.rel_value;
1396 LOG (GNUNET_ERROR_TYPE_DEBUG,
1397 "Sending ACK to `%s' including delay of %u ms\n",
1398 GNUNET_a2s (rc->src_addr,
1399 (rc->src_addr->sa_family ==
1400 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1404 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1406 udpw->cont_cls = NULL;
1407 udpw->frag_ctx = NULL;
1408 udpw->msg_size = msize;
1410 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1411 udpw->udp = (char *)&udpw[1];
1413 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1414 udp_ack->header.size = htons ((uint16_t) msize);
1415 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1416 udp_ack->delay = htonl (delay);
1417 udp_ack->sender = *rc->plugin->env->my_identity;
1418 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1420 enqueue (rc->plugin, udpw);
1424 static void read_process_msg (struct Plugin *plugin,
1425 const struct GNUNET_MessageHeader *msg,
1429 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1431 GNUNET_break_op (0);
1434 process_udp_message (plugin, (const struct UDPMessage *) msg,
1435 (const struct sockaddr *) addr, fromlen);
1439 static void read_process_ack (struct Plugin *plugin,
1440 const struct GNUNET_MessageHeader *msg,
1444 const struct GNUNET_MessageHeader *ack;
1445 const struct UDP_ACK_Message *udp_ack;
1446 struct LookupContext l_ctx;
1447 struct Session *s = NULL;
1448 struct GNUNET_TIME_Relative flow_delay;
1450 if (ntohs (msg->size) <
1451 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1453 GNUNET_break_op (0);
1457 udp_ack = (const struct UDP_ACK_Message *) msg;
1459 l_ctx.addr = (const struct sockaddr *) addr;
1460 l_ctx.addrlen = fromlen;
1462 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1463 &lookup_session_by_addr_it,
1467 if ((s == NULL) || (s->frag_ctx == NULL))
1470 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1471 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1472 flow_delay.rel_value);
1473 s->flow_delay_from_other_peer =
1474 GNUNET_TIME_relative_to_absolute (flow_delay);
1476 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1477 if (ntohs (ack->size) !=
1478 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1480 GNUNET_break_op (0);
1484 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1487 LOG (GNUNET_ERROR_TYPE_DEBUG,
1488 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1489 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1490 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1496 LOG (GNUNET_ERROR_TYPE_DEBUG,
1497 "FULL MESSAGE ACKed\n",
1498 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1499 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1501 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1503 struct UDPMessageWrapper * udpw = NULL;
1504 if (s->addrlen == sizeof (struct sockaddr_in6))
1506 udpw = plugin->ipv6_queue_head;
1509 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1511 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1517 if (s->addrlen == sizeof (struct sockaddr_in))
1519 udpw = plugin->ipv4_queue_head;
1522 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1524 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1531 if (s->frag_ctx->cont != NULL)
1533 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1534 GNUNET_free (s->frag_ctx);
1539 static void read_process_fragment (struct Plugin *plugin,
1540 const struct GNUNET_MessageHeader *msg,
1544 struct DefragContext *d_ctx;
1545 struct GNUNET_TIME_Absolute now;
1546 struct FindReceiveContext frc;
1550 frc.addr = (const struct sockaddr *) addr;
1551 frc.addr_len = fromlen;
1554 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1555 (unsigned int) ntohs (msg->size),
1556 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1559 /* Lookup existing receive context for this address */
1560 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1561 &find_receive_context,
1563 now = GNUNET_TIME_absolute_get ();
1568 /* Create a new defragmentation context */
1569 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1570 memcpy (&d_ctx[1], addr, fromlen);
1571 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1572 d_ctx->addr_len = fromlen;
1573 d_ctx->plugin = plugin;
1575 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1576 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1577 &fragment_msg_proc, &ack_proc);
1579 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1580 (GNUNET_CONTAINER_HeapCostType)
1583 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1584 (unsigned int) ntohs (msg->size),
1585 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1591 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1592 (unsigned int) ntohs (msg->size),
1593 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1597 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1599 /* keep this 'rc' from expiring */
1600 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1601 (GNUNET_CONTAINER_HeapCostType)
1604 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1605 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1607 /* remove 'rc' that was inactive the longest */
1608 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1609 GNUNET_assert (NULL != d_ctx);
1610 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1611 GNUNET_free (d_ctx);
1616 * Read and process a message from the given socket.
1618 * @param plugin the overall plugin
1619 * @param rsock socket to read from
1622 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1628 const struct GNUNET_MessageHeader *msg;
1630 fromlen = sizeof (addr);
1631 memset (&addr, 0, sizeof (addr));
1632 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1633 (struct sockaddr *) &addr, &fromlen);
1635 if (size < sizeof (struct GNUNET_MessageHeader))
1637 GNUNET_break_op (0);
1640 msg = (const struct GNUNET_MessageHeader *) buf;
1642 LOG (GNUNET_ERROR_TYPE_DEBUG,
1643 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1644 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1646 if (size != ntohs (msg->size))
1648 GNUNET_break_op (0);
1652 switch (ntohs (msg->type))
1654 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1655 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1658 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1659 read_process_msg (plugin, msg, addr, fromlen);
1662 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1663 read_process_ack (plugin, msg, addr, fromlen);;
1666 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1667 read_process_fragment (plugin, msg, addr, fromlen);
1671 GNUNET_break_op (0);
1677 udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
1681 struct GNUNET_TIME_Absolute max;
1682 struct GNUNET_TIME_Absolute ;
1684 struct UDPMessageWrapper *udpw = NULL;
1686 if (sock == plugin->sockv4)
1688 udpw = plugin->ipv4_queue_head;
1690 else if (sock == plugin->sockv6)
1692 udpw = plugin->ipv6_queue_head;
1700 const struct sockaddr * sa = udpw->session->sock_addr;
1701 slen = udpw->session->addrlen;
1703 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1705 while (udpw != NULL)
1707 if (max.abs_value != udpw->timeout.abs_value)
1709 /* Message timed out */
1711 if (udpw->cont != NULL)
1712 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1713 if (udpw->frag_ctx != NULL)
1716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1717 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1719 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1720 GNUNET_free (udpw->frag_ctx);
1721 udpw->session->frag_ctx = NULL;
1726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1727 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1731 if (sock == plugin->sockv4)
1733 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1735 udpw = plugin->ipv4_queue_head;
1737 else if (sock == plugin->sockv6)
1739 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1741 udpw = plugin->ipv6_queue_head;
1746 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1747 if (delta.rel_value == 0)
1749 /* this message is not delayed */
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1751 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1756 /* this message is delayed, try next */
1757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1758 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1767 /* No message left */
1771 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
1773 if (GNUNET_SYSERR == sent)
1775 LOG (GNUNET_ERROR_TYPE_ERROR,
1776 "UDP could not transmit %u-byte message to `%s': `%s'\n",
1777 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen),
1779 if (udpw->cont != NULL)
1780 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1784 LOG (GNUNET_ERROR_TYPE_DEBUG,
1785 "UDP transmitted %u-byte message to `%s' (%d: %s)\n",
1786 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1787 (sent < 0) ? STRERROR (errno) : "ok");
1789 /* This was just a message fragment */
1790 if (udpw->frag_ctx != NULL)
1792 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1794 /* This was a complete message*/
1797 if (udpw->cont != NULL)
1798 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1801 if (sock == plugin->sockv4)
1802 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1803 else if (sock == plugin->sockv6)
1804 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1812 * We have been notified that our readset has something to read. We don't
1813 * know which socket needs to be read, so we have to check each one
1814 * Then reschedule this function to be called again once more is available.
1816 * @param cls the plugin handle
1817 * @param tc the scheduling context (for rescheduling this function again)
1820 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1822 struct Plugin *plugin = cls;
1824 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1825 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1827 plugin->with_v4_ws = GNUNET_NO;
1829 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1831 if ((NULL != plugin->sockv4) &&
1832 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1833 udp_select_read (plugin, plugin->sockv4);
1837 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1839 if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
1840 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
1842 udp_select_send (plugin, plugin->sockv4);
1846 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1847 GNUNET_SCHEDULER_cancel (plugin->select_task);
1848 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1849 GNUNET_SCHEDULER_NO_TASK,
1850 GNUNET_TIME_UNIT_FOREVER_REL,
1852 (plugin->ipv4_queue_head != NULL) ? plugin->ws_v4 : NULL,
1853 &udp_plugin_select, plugin);
1854 if (plugin->ipv4_queue_head != NULL)
1855 plugin->with_v4_ws = GNUNET_YES;
1857 plugin->with_v4_ws = GNUNET_NO;
1862 * We have been notified that our readset has something to read. We don't
1863 * know which socket needs to be read, so we have to check each one
1864 * Then reschedule this function to be called again once more is available.
1866 * @param cls the plugin handle
1867 * @param tc the scheduling context (for rescheduling this function again)
1870 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1872 struct Plugin *plugin = cls;
1874 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1875 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1878 plugin->with_v6_ws = GNUNET_NO;
1879 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1881 if ((NULL != plugin->sockv6) &&
1882 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1883 udp_select_read (plugin, plugin->sockv6);
1886 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1888 if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
1889 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
1891 udp_select_send (plugin, plugin->sockv6);
1894 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1895 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
1896 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1897 GNUNET_SCHEDULER_NO_TASK,
1898 GNUNET_TIME_UNIT_FOREVER_REL,
1900 (plugin->ipv6_queue_head != NULL) ? plugin->ws_v6 : NULL,
1901 &udp_plugin_select_v6, plugin);
1902 if (plugin->ipv6_queue_head != NULL)
1903 plugin->with_v6_ws = GNUNET_YES;
1905 plugin->with_v6_ws = GNUNET_NO;
1910 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1913 int sockets_created = 0;
1914 struct sockaddr *serverAddr;
1915 struct sockaddr *addrs[2];
1916 socklen_t addrlens[2];
1919 /* Create IPv6 socket */
1920 if (plugin->enable_ipv6 == GNUNET_YES)
1922 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1923 if (NULL == plugin->sockv6)
1925 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
1926 plugin->enable_ipv6 = GNUNET_NO;
1930 #if HAVE_SOCKADDR_IN_SIN_LEN
1931 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1933 serverAddrv6->sin6_family = AF_INET6;
1934 serverAddrv6->sin6_addr = in6addr_any;
1935 serverAddrv6->sin6_port = htons (plugin->port);
1936 addrlen = sizeof (struct sockaddr_in6);
1937 serverAddr = (struct sockaddr *) serverAddrv6;
1939 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1940 ntohs (serverAddrv6->sin6_port));
1943 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1946 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1948 LOG (GNUNET_ERROR_TYPE_DEBUG,
1949 "IPv6 Binding failed, trying new port %d\n",
1950 ntohs (serverAddrv6->sin6_port));
1955 GNUNET_NETWORK_socket_close (plugin->sockv6);
1956 plugin->sockv6 = NULL;
1960 if (plugin->sockv6 != NULL)
1963 LOG (GNUNET_ERROR_TYPE_DEBUG,
1964 "IPv6 socket created on port %d\n",
1965 ntohs (serverAddrv6->sin6_port));
1967 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1968 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1974 /* Create IPv4 socket */
1975 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1976 if (NULL == plugin->sockv4)
1978 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1982 #if HAVE_SOCKADDR_IN_SIN_LEN
1983 serverAddrv4->sin_len = sizeof (serverAddrv4);
1985 serverAddrv4->sin_family = AF_INET;
1986 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1987 serverAddrv4->sin_port = htons (plugin->port);
1988 addrlen = sizeof (struct sockaddr_in);
1989 serverAddr = (struct sockaddr *) serverAddrv4;
1992 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1993 ntohs (serverAddrv4->sin_port));
1996 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1999 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
2001 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
2002 ntohs (serverAddrv4->sin_port));
2007 GNUNET_NETWORK_socket_close (plugin->sockv4);
2008 plugin->sockv4 = NULL;
2012 if (plugin->sockv4 != NULL)
2014 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
2015 addrlens[sockets_created] = sizeof (struct sockaddr_in);
2020 /* Create file descriptors */
2021 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
2022 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
2023 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
2024 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
2025 if (NULL != plugin->sockv4)
2027 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
2028 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
2031 if (sockets_created == 0)
2032 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2034 plugin->select_task =
2035 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2036 GNUNET_SCHEDULER_NO_TASK,
2037 GNUNET_TIME_UNIT_FOREVER_REL,
2040 &udp_plugin_select, plugin);
2041 plugin->with_v4_ws = GNUNET_NO;
2043 if (plugin->enable_ipv6 == GNUNET_YES)
2045 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
2046 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
2047 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
2048 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
2049 if (NULL != plugin->sockv6)
2051 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
2052 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
2055 plugin->select_task_v6 =
2056 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2057 GNUNET_SCHEDULER_NO_TASK,
2058 GNUNET_TIME_UNIT_FOREVER_REL,
2061 &udp_plugin_select_v6, plugin);
2062 plugin->with_v6_ws = GNUNET_NO;
2065 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2066 GNUNET_NO, plugin->port,
2068 (const struct sockaddr **) addrs, addrlens,
2069 &udp_nat_port_map_callback, NULL, plugin);
2071 return sockets_created;
2076 * The exported method. Makes the core api available via a global and
2077 * returns the udp transport API.
2079 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2080 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2083 libgnunet_plugin_transport_udp_init (void *cls)
2085 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2086 struct GNUNET_TRANSPORT_PluginFunctions *api;
2087 struct Plugin *plugin;
2089 unsigned long long port;
2090 unsigned long long aport;
2091 unsigned long long broadcast;
2092 unsigned long long udp_max_bps;
2093 unsigned long long enable_v6;
2094 char * bind4_address;
2095 char * bind6_address;
2096 struct GNUNET_TIME_Relative interval;
2098 struct sockaddr_in serverAddrv4;
2099 struct sockaddr_in6 serverAddrv6;
2103 if (NULL == env->receive)
2105 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2106 initialze the plugin or the API */
2107 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2109 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2110 api->address_to_string = &udp_address_to_string;
2111 api->string_to_address = &udp_string_to_address;
2115 /* Get port number */
2117 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
2121 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2122 "ADVERTISED_PORT", &aport))
2126 LOG (GNUNET_ERROR_TYPE_WARNING,
2127 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
2134 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
2137 enable_v6 = GNUNET_NO;
2140 enable_v6 = GNUNET_YES;
2144 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
2145 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
2148 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2149 "BINDTO", &bind4_address))
2151 LOG (GNUNET_ERROR_TYPE_DEBUG,
2152 "Binding udp plugin to specific address: `%s'\n",
2154 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
2156 GNUNET_free (bind4_address);
2162 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2163 "BINDTO6", &bind6_address))
2165 LOG (GNUNET_ERROR_TYPE_DEBUG,
2166 "Binding udp plugin to specific address: `%s'\n",
2169 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
2171 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
2173 GNUNET_free_non_null (bind4_address);
2174 GNUNET_free (bind6_address);
2180 /* Enable neighbour discovery */
2181 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
2183 if (broadcast == GNUNET_SYSERR)
2184 broadcast = GNUNET_NO;
2186 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
2187 "BROADCAST_INTERVAL", &interval))
2189 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
2192 /* Maximum datarate */
2193 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2194 "MAX_BPS", &udp_max_bps))
2196 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
2199 plugin = GNUNET_malloc (sizeof (struct Plugin));
2200 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2202 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
2203 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
2206 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
2207 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2208 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
2209 plugin->port = port;
2210 plugin->aport = aport;
2211 plugin->broadcast_interval = interval;
2212 plugin->enable_ipv6 = enable_v6;
2217 api->disconnect = &udp_disconnect;
2218 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2219 api->address_to_string = &udp_address_to_string;
2220 api->string_to_address = &udp_string_to_address;
2221 api->check_address = &udp_plugin_check_address;
2222 api->get_session = &udp_plugin_get_session;
2223 api->send = &udp_plugin_send;
2225 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
2226 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
2227 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
2229 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
2230 GNUNET_free (plugin);
2235 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
2236 if (broadcast == GNUNET_YES)
2237 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
2240 GNUNET_free_non_null (bind4_address);
2241 GNUNET_free_non_null (bind6_address);
2247 heap_cleanup_iterator (void *cls,
2248 struct GNUNET_CONTAINER_HeapNode *
2249 node, void *element,
2250 GNUNET_CONTAINER_HeapCostType
2253 struct DefragContext * d_ctx = element;
2255 GNUNET_CONTAINER_heap_remove_node (node);
2256 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
2257 GNUNET_free (d_ctx);
2264 * The exported method. Makes the core api available via a global and
2265 * returns the udp transport API.
2267 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2271 libgnunet_plugin_transport_udp_done (void *cls)
2273 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2274 struct Plugin *plugin = api->cls;
2282 stop_broadcast (plugin);
2284 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2286 GNUNET_SCHEDULER_cancel (plugin->select_task);
2287 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2289 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2291 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
2292 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2295 /* Closing sockets */
2296 if (plugin->sockv4 != NULL)
2298 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2299 plugin->sockv4 = NULL;
2301 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
2302 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
2304 if (plugin->sockv6 != NULL)
2306 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2307 plugin->sockv6 = NULL;
2309 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
2310 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
2313 GNUNET_NAT_unregister (plugin->nat);
2315 if (plugin->defrag_ctxs != NULL)
2317 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2318 heap_cleanup_iterator, NULL);
2319 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2320 plugin->defrag_ctxs = NULL;
2322 if (plugin->mst != NULL)
2324 GNUNET_SERVER_mst_destroy(plugin->mst);
2328 /* Clean up leftover messages */
2329 struct UDPMessageWrapper * udpw;
2330 udpw = plugin->ipv4_queue_head;
2331 while (udpw != NULL)
2333 struct UDPMessageWrapper *tmp = udpw->next;
2334 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
2335 if (udpw->cont != NULL)
2336 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2340 udpw = plugin->ipv6_queue_head;
2341 while (udpw != NULL)
2343 struct UDPMessageWrapper *tmp = udpw->next;
2344 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
2345 if (udpw->cont != NULL)
2346 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2351 /* Clean up sessions */
2353 LOG (GNUNET_ERROR_TYPE_DEBUG,
2354 "Cleaning up sessions\n");
2356 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2357 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2360 GNUNET_free (plugin);
2366 /* end of plugin_transport_udp.c */