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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 NAT punching
25 * @author Christian Grothoff
26 * @author Nathan Evans
29 #include "gnunet_hello_lib.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_fragmentation_lib.h"
32 #include "gnunet_nat_lib.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_resolver_service.h"
35 #include "gnunet_signatures.h"
36 #include "gnunet_constants.h"
37 #include "gnunet_statistics_service.h"
38 #include "gnunet_transport_service.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
45 #define DEBUG_UDP GNUNET_EXTRA_LOGGING
48 * MTU for fragmentation subsystem. Should be conservative since
49 * all communicating peers MUST work with this MTU.
54 * Number of messages we can defragment in parallel. We only really
55 * defragment 1 message at a time, but if messages get re-ordered, we
56 * may want to keep knowledge about the previous message to avoid
57 * discarding the current message in favor of a single fragment of a
58 * previous message. 3 should be good since we don't expect massive
59 * message reorderings with UDP.
61 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
64 * We keep a defragmentation queue per sender address. How many
65 * sender addresses do we support at the same time? Memory consumption
66 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
67 * value. (So 128 corresponds to 12 MB and should suffice for
68 * connecting to roughly 128 peers via UDP).
70 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
74 * UDP Message-Packet header (after defragmentation).
81 struct GNUNET_MessageHeader header;
84 * Always zero for now.
89 * What is the identity of the sender
91 struct GNUNET_PeerIdentity sender;
97 * UDP ACK Message-Packet header (after defragmentation).
99 struct UDP_ACK_Message
104 struct GNUNET_MessageHeader header;
107 * Desired delay for flow control
112 * What is the identity of the sender
114 struct GNUNET_PeerIdentity sender;
118 struct UDP_Beacon_Message
123 struct GNUNET_MessageHeader header;
126 * What is the identity of the sender
128 struct GNUNET_PeerIdentity sender;
133 * Network format for IPv4 addresses.
135 struct IPv4UdpAddress
138 * IPv4 address, in network byte order.
140 uint32_t ipv4_addr GNUNET_PACKED;
143 * Port number, in network byte order.
145 uint16_t u4_port GNUNET_PACKED;
150 * Network format for IPv6 addresses.
152 struct IPv6UdpAddress
158 struct in6_addr ipv6_addr GNUNET_PACKED;
161 * Port number, in network byte order.
163 uint16_t u6_port GNUNET_PACKED;
167 /* Forward definition */
172 * Session with another peer. FIXME: why not make this into
173 * a regular 'struct Session' and pass it around!?
179 * Which peer is this session for?
181 struct GNUNET_PeerIdentity target;
184 * Pointer to the global plugin struct.
186 struct Plugin *plugin;
189 * Address of the other peer
191 const struct sockaddr *sock_addr;
196 * Function to call upon completion of the transmission.
198 GNUNET_TRANSPORT_TransmitContinuation cont;
201 * Closure for 'cont'.
206 * Current outgoing message to this peer.
208 struct GNUNET_FRAGMENT_Context *frag;
210 struct GNUNET_TIME_Absolute valid_until;
212 GNUNET_SCHEDULER_TaskIdentifier invalidation_task;
214 GNUNET_SCHEDULER_TaskIdentifier delayed_cont_task;
217 * Desired delay for next sending we send to other peer
219 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
222 * Desired delay for next sending we received from other peer
224 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
229 * Data structure to track defragmentation contexts based
230 * on the source of the UDP traffic.
232 struct ReceiveContext
236 * Defragmentation context.
238 struct GNUNET_DEFRAGMENT_Context *defrag;
241 * Source address this receive context is for (allocated at the
242 * end of the struct).
244 const struct sockaddr *src_addr;
247 * Reference to master plugin struct.
249 struct Plugin *plugin;
252 * Node in the defrag heap.
254 struct GNUNET_CONTAINER_HeapNode *hnode;
257 * Length of 'src_addr'
261 struct GNUNET_PeerIdentity id;
265 struct BroadcastAddress
267 struct BroadcastAddress *next;
268 struct BroadcastAddress *prev;
276 * Encapsulation of all of the state of the plugin.
284 struct GNUNET_TRANSPORT_PluginEnvironment *env;
287 * Session of peers with whom we are currently connected,
288 * map of peer identity to 'struct PeerSession'.
290 struct GNUNET_CONTAINER_MultiHashMap *sessions;
293 * Session of peers with whom we are currently connected,
294 * map of peer identity to 'struct PeerSession'.
296 struct GNUNET_CONTAINER_MultiHashMap *inbound_sessions;
299 * Heap with all of our defragmentation activities.
301 struct GNUNET_CONTAINER_Heap *defrags;
306 GNUNET_SCHEDULER_TaskIdentifier select_task;
309 * Tokenizer for inbound messages.
311 struct GNUNET_SERVER_MessageStreamTokenizer *mst;
314 * Bandwidth tracker to limit global UDP traffic.
316 struct GNUNET_BANDWIDTH_Tracker tracker;
319 * Address we were told to bind to exclusively (IPv4).
324 * Address we were told to bind to exclusively (IPv6).
329 * Handle to NAT traversal support.
331 struct GNUNET_NAT_Handle *nat;
336 struct GNUNET_NETWORK_FDSet *rs;
339 * The read socket for IPv4
341 struct GNUNET_NETWORK_Handle *sockv4;
344 * The read socket for IPv6
346 struct GNUNET_NETWORK_Handle *sockv6;
349 * Beacon broadcasting
350 * -------------------
356 struct GNUNET_TIME_Relative broadcast_interval;
359 * Broadcast with IPv4
364 * Broadcast with IPv6
370 * Tokenizer for inbound messages.
372 struct GNUNET_SERVER_MessageStreamTokenizer *broadcast_ipv6_mst;
373 struct GNUNET_SERVER_MessageStreamTokenizer *broadcast_ipv4_mst;
376 * ID of select broadcast task
378 GNUNET_SCHEDULER_TaskIdentifier send_ipv4_broadcast_task;
381 * ID of select broadcast task
383 GNUNET_SCHEDULER_TaskIdentifier send_ipv6_broadcast_task;
386 * IPv6 multicast address
388 struct sockaddr_in6 ipv6_multicast_address;
391 * DLL of IPv4 broadcast addresses
393 struct BroadcastAddress *ipv4_broadcast_tail;
394 struct BroadcastAddress *ipv4_broadcast_head;
398 * expected delay for ACKs
400 struct GNUNET_TIME_Relative last_expected_delay;
403 * Port we broadcasting on.
405 uint16_t broadcast_port;
413 * Port we advertise on.
419 struct PeerSessionIteratorContext
421 struct Session *result;
428 * Lookup the session for the given peer.
430 * @param plugin the plugin
431 * @param peer peer's identity
432 * @return NULL if we have no session
434 static struct Session *
435 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
437 return GNUNET_CONTAINER_multihashmap_get (plugin->sessions,
443 inbound_session_iterator (void *cls, const GNUNET_HashCode * key, void *value)
445 struct PeerSessionIteratorContext *psc = cls;
446 struct Session *s = value;
448 if (s->addrlen == psc->addrlen)
450 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
453 if (psc->result != NULL)
460 * Lookup the session for the given peer.
462 * @param plugin the plugin
463 * @param peer peer's identity
464 * @param addr address
465 * @param addrlen address length
466 * @return NULL if we have no session
468 static struct Session *
469 find_inbound_session (struct Plugin *plugin,
470 const struct GNUNET_PeerIdentity *peer, const void *addr,
473 struct PeerSessionIteratorContext psc;
476 psc.addrlen = addrlen;
479 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->inbound_sessions,
481 &inbound_session_iterator, &psc);
487 inbound_session_by_addr_iterator (void *cls, const GNUNET_HashCode * key,
490 struct PeerSessionIteratorContext *psc = cls;
491 struct Session *s = value;
493 if (s->addrlen == psc->addrlen)
495 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
498 if (psc->result != NULL)
505 * Lookup the session for the given peer just by address.
507 * @param plugin the plugin
508 * @param addr address
509 * @param addrlen address length
510 * @return NULL if we have no session
512 static struct Session *
513 find_inbound_session_by_addr (struct Plugin *plugin, const void *addr,
516 struct PeerSessionIteratorContext psc;
519 psc.addrlen = addrlen;
522 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions,
523 &inbound_session_by_addr_iterator,
530 * Destroy a session, plugin is being unloaded.
533 * @param key hash of public key of target peer
534 * @param value a 'struct PeerSession*' to clean up
535 * @return GNUNET_OK (continue to iterate)
538 destroy_session (void *cls, const GNUNET_HashCode * key, void *value)
540 struct Session *peer_session = value;
542 GNUNET_assert (GNUNET_YES ==
543 GNUNET_CONTAINER_multihashmap_remove (peer_session->
548 if (peer_session->frag != NULL)
549 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
550 if (GNUNET_SCHEDULER_NO_TASK != peer_session->delayed_cont_task)
551 GNUNET_SCHEDULER_cancel (peer_session->delayed_cont_task);
552 GNUNET_free (peer_session);
558 * Destroy a session, plugin is being unloaded.
561 * @param key hash of public key of target peer
562 * @param value a 'struct PeerSession*' to clean up
563 * @return GNUNET_OK (continue to iterate)
566 destroy_inbound_session (void *cls, const GNUNET_HashCode * key, void *value)
568 struct Session *s = value;
570 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
571 GNUNET_SCHEDULER_cancel (s->invalidation_task);
572 if (GNUNET_SCHEDULER_NO_TASK != s->delayed_cont_task)
573 GNUNET_SCHEDULER_cancel (s->delayed_cont_task);
574 GNUNET_CONTAINER_multihashmap_remove (s->plugin->inbound_sessions,
575 &s->target.hashPubKey, s);
582 * Disconnect from a remote node. Clean up session if we have one for this peer
584 * @param cls closure for this call (should be handle to Plugin)
585 * @param target the peeridentity of the peer to disconnect
586 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
589 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
591 struct Plugin *plugin = cls;
592 struct Session *session;
594 session = find_session (plugin, target);
597 GNUNET_assert (GNUNET_OK ==
598 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
602 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->inbound_sessions,
604 &destroy_inbound_session, NULL);
605 plugin->last_expected_delay = GNUNET_FRAGMENT_context_destroy (session->frag);
606 if (GNUNET_SCHEDULER_NO_TASK != session->delayed_cont_task)
607 GNUNET_SCHEDULER_cancel (session->delayed_cont_task);
608 if (session->cont != NULL)
609 session->cont (session->cont_cls, target, GNUNET_SYSERR);
610 GNUNET_free (session);
615 * Actually send out the message.
617 * @param plugin the plugin
618 * @param sa the address to send the message to
619 * @param msg message to transmit
620 * @return the number of bytes written
623 udp_send (struct Plugin *plugin, const struct sockaddr *sa,
624 const struct GNUNET_MessageHeader *msg)
629 switch (sa->sa_family)
632 if (NULL == plugin->sockv4)
635 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, ntohs (msg->size),
636 sa, slen = sizeof (struct sockaddr_in));
639 if (NULL == plugin->sockv6)
642 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, ntohs (msg->size),
643 sa, slen = sizeof (struct sockaddr_in6));
649 if (GNUNET_SYSERR == sent)
651 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
652 LOG (GNUNET_ERROR_TYPE_ERROR,
653 "UDP transmited %u-byte message to %s (%d: %s)\n",
654 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen), (int) sent,
655 (sent < 0) ? STRERROR (errno) : "ok");
658 LOG (GNUNET_ERROR_TYPE_DEBUG,
659 "UDP transmited %u-byte message to %s (%d: %s)\n",
660 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen), (int) sent,
661 (sent < 0) ? STRERROR (errno) : "ok");
667 * Function that is called with messages created by the fragmentation
668 * module. In the case of the 'proc' callback of the
669 * GNUNET_FRAGMENT_context_create function, this function must
670 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
672 * @param cls closure, the 'struct PeerSession'
673 * @param msg the message that was created
676 send_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
678 struct Session *session = cls;
680 udp_send (session->plugin, session->sock_addr, msg);
681 GNUNET_FRAGMENT_context_transmission_done (session->frag);
685 static struct Session *
686 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
687 const void *addr, size_t addrlen,
688 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
690 struct Session *peer_session;
691 const struct IPv4UdpAddress *t4;
692 const struct IPv6UdpAddress *t6;
693 struct sockaddr_in *v4;
694 struct sockaddr_in6 *v6;
699 case sizeof (struct IPv4UdpAddress):
700 if (NULL == plugin->sockv4)
706 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
707 len = sizeof (struct sockaddr_in);
708 v4 = (struct sockaddr_in *) &peer_session[1];
709 v4->sin_family = AF_INET;
710 #if HAVE_SOCKADDR_IN_SIN_LEN
711 v4->sin_len = sizeof (struct sockaddr_in);
713 v4->sin_port = t4->u4_port;
714 v4->sin_addr.s_addr = t4->ipv4_addr;
716 case sizeof (struct IPv6UdpAddress):
717 if (NULL == plugin->sockv6)
723 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
724 len = sizeof (struct sockaddr_in6);
725 v6 = (struct sockaddr_in6 *) &peer_session[1];
726 v6->sin6_family = AF_INET6;
727 #if HAVE_SOCKADDR_IN_SIN_LEN
728 v6->sin6_len = sizeof (struct sockaddr_in6);
730 v6->sin6_port = t6->u6_port;
731 v6->sin6_addr = t6->ipv6_addr;
734 /* Must have a valid address to send to */
739 peer_session->valid_until = GNUNET_TIME_absolute_get_zero ();
740 peer_session->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
741 peer_session->addrlen = len;
742 peer_session->target = *target;
743 peer_session->plugin = plugin;
744 peer_session->sock_addr = (const struct sockaddr *) &peer_session[1];
745 peer_session->cont = cont;
746 peer_session->cont_cls = cont_cls;
752 udp_address_to_string (void *cls, const void *addr, size_t addrlen);
756 udp_call_continuation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
758 struct Session *s = cls;
759 GNUNET_TRANSPORT_TransmitContinuation cont = s->cont;
761 s->delayed_cont_task = GNUNET_SCHEDULER_NO_TASK;
763 cont (s->cont_cls, &s->target, GNUNET_OK);
768 * Function that can be used by the transport service to transmit
769 * a message using the plugin.
772 * @param target who should receive this message (ignored by UDP)
773 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
774 * @param msgbuf_size the size of the msgbuf to send
775 * @param priority how important is the message (ignored by UDP)
776 * @param timeout when should we time out (give up) if we can not transmit?
777 * @param session identifier used for this session (NULL for UDP)
778 * @param addr the addr to send the message to
779 * @param addrlen the len of addr
780 * @param force_address not used, we had better have an address to send to
781 * because we are stateless!!
782 * @param cont continuation to call once the message has
783 * been transmitted (or if the transport is ready
784 * for the next transmission call; or if the
785 * peer disconnected...)
786 * @param cont_cls closure for cont
788 * @return the number of bytes written (may return 0 and the message can
789 * still be transmitted later!)
792 udp_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
793 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
794 struct GNUNET_TIME_Relative timeout, struct Session *session,
795 const void *addr, size_t addrlen, int force_address,
796 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
798 struct Plugin *plugin = cls;
799 struct Session *peer_session;
801 const struct IPv4UdpAddress *t4;
802 const struct IPv6UdpAddress *t6;
803 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
805 struct UDPMessage *udp;
806 struct GNUNET_TIME_Relative delta;
808 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
811 return GNUNET_SYSERR;
814 LOG (GNUNET_ERROR_TYPE_DEBUG,
815 "UDP transmits %u-byte message to `%s' using address `%s' session 0x%X mode %i\n",
816 msgbuf_size, GNUNET_i2s (target), udp_address_to_string (NULL, addr,
818 session, force_address);
820 if ((force_address == GNUNET_SYSERR) && (session == NULL))
821 return GNUNET_SYSERR;
824 /* safety check: comparing address to address stored in session */
825 if ((session != NULL) && (addr != NULL) && (addrlen != 0))
828 GNUNET_assert (GNUNET_YES ==
829 GNUNET_CONTAINER_multihashmap_contains_value
830 (plugin->inbound_sessions, &target->hashPubKey, s));
832 if (0 != memcmp (&s->target, target, sizeof (struct GNUNET_PeerIdentity)))
833 return GNUNET_SYSERR;
836 case sizeof (struct IPv4UdpAddress):
837 if (NULL == plugin->sockv4)
840 cont (cont_cls, target, GNUNET_SYSERR);
841 return GNUNET_SYSERR;
844 if (s->addrlen != (sizeof (struct sockaddr_in)))
845 return GNUNET_SYSERR;
846 struct sockaddr_in *a4 = (struct sockaddr_in *) s->sock_addr;
848 GNUNET_assert (a4->sin_port == t4->u4_port);
850 memcmp (&a4->sin_addr, &t4->ipv4_addr,
851 sizeof (struct in_addr)));
852 LOG (GNUNET_ERROR_TYPE_DEBUG, "Session 0x%X successfully checked!\n",
855 case sizeof (struct IPv6UdpAddress):
856 if (NULL == plugin->sockv6)
859 cont (cont_cls, target, GNUNET_SYSERR);
860 return GNUNET_SYSERR;
863 GNUNET_assert (s->addrlen == sizeof (struct sockaddr_in6));
864 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) s->sock_addr;
866 GNUNET_assert (a6->sin6_port == t6->u6_port);
868 memcmp (&a6->sin6_addr, &t6->ipv6_addr,
869 sizeof (struct in6_addr)));
870 LOG (GNUNET_ERROR_TYPE_DEBUG, "Session 0x%X successfully checked!\n",
874 /* Must have a valid address to send to */
879 if ((addr == NULL) || (addrlen == 0))
880 return GNUNET_SYSERR;
881 peer_session = create_session (plugin, target, addr, addrlen, cont, cont_cls);
882 if (peer_session == NULL)
885 cont (cont_cls, target, GNUNET_SYSERR);
886 return GNUNET_SYSERR;;
890 udp = (struct UDPMessage *) mbuf;
891 udp->header.size = htons (mlen);
892 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
893 udp->reserved = htonl (0);
894 udp->sender = *plugin->env->my_identity;
895 memcpy (&udp[1], msgbuf, msgbuf_size);
898 delta = GNUNET_TIME_absolute_get_remaining (s->flow_delay_from_other_peer);
900 delta = GNUNET_TIME_UNIT_ZERO;
903 mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
906 if ((delta.rel_value > 0) && (mlen > 0))
909 s->cont_cls = cont_cls;
910 s->delayed_cont_task =
911 GNUNET_SCHEDULER_add_delayed (delta, &udp_call_continuation, s);
914 cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
916 GNUNET_free_non_null (peer_session);
920 GNUNET_assert (GNUNET_OK ==
921 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
924 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
926 GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
928 plugin->last_expected_delay,
929 &udp->header, &send_fragment,
937 * Closure for 'process_inbound_tokenized_messages'
939 struct SourceInformation
944 struct GNUNET_PeerIdentity sender;
952 * Number of bytes in source address.
956 struct Session *session;
961 * Message tokenizer has broken up an incomming message. Pass it on
964 * @param cls the 'struct Plugin'
965 * @param client the 'struct SourceInformation'
966 * @param hdr the actual message
969 process_inbound_tokenized_messages (void *cls, void *client,
970 const struct GNUNET_MessageHeader *hdr)
972 struct Plugin *plugin = cls;
973 struct SourceInformation *si = client;
974 struct GNUNET_ATS_Information distance;
975 struct GNUNET_TIME_Relative delay;
978 distance.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
979 distance.value = htonl (1);
981 LOG (GNUNET_ERROR_TYPE_DEBUG, "Giving Session %X %s to transport\n",
982 si->session, GNUNET_i2s (&si->session->target));
984 plugin->env->receive (plugin->env->cls, &si->sender, hdr, &distance, 1,
985 si->session, si->arg, si->args);
986 si->session->flow_delay_for_other_peer = delay;
990 invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
992 struct Session *s = cls;
994 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
995 LOG (GNUNET_ERROR_TYPE_DEBUG, "Session %X (`%s') is now invalid\n", s,
996 GNUNET_a2s (s->sock_addr, s->addrlen));
998 s->plugin->env->session_end (s->plugin->env->cls, &s->target, s);
999 GNUNET_assert (GNUNET_YES ==
1000 GNUNET_CONTAINER_multihashmap_remove (s->
1001 plugin->inbound_sessions,
1002 &s->target.hashPubKey,
1009 * We've received a UDP Message. Process it (pass contents to main service).
1011 * @param plugin plugin context
1012 * @param msg the message
1013 * @param sender_addr sender address
1014 * @param sender_addr_len number of bytes in sender_addr
1017 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1018 const struct sockaddr *sender_addr,
1019 socklen_t sender_addr_len)
1021 struct SourceInformation si;
1022 struct IPv4UdpAddress u4;
1023 struct IPv6UdpAddress u6;
1027 if (0 != ntohl (msg->reserved))
1029 GNUNET_break_op (0);
1032 if (ntohs (msg->header.size) <
1033 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1035 GNUNET_break_op (0);
1039 /* convert address */
1040 switch (sender_addr->sa_family)
1043 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1044 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1045 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1050 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1051 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1052 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1061 LOG (GNUNET_ERROR_TYPE_DEBUG,
1062 "Received message with %u bytes from peer `%s' at `%s'\n",
1063 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1064 GNUNET_a2s (sender_addr, sender_addr_len));
1067 /* create a session for inbound connections */
1068 const struct UDPMessage *udp_msg = (const struct UDPMessage *) msg;
1070 LOG (GNUNET_ERROR_TYPE_DEBUG,
1071 "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
1072 GNUNET_i2s (&udp_msg->sender), udp_address_to_string (NULL, arg, args));
1074 struct Session *s = NULL;
1076 s = find_inbound_session (plugin, &udp_msg->sender, sender_addr,
1081 LOG (GNUNET_ERROR_TYPE_DEBUG,
1082 "Found existing inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
1083 s, GNUNET_i2s (&s->target), udp_address_to_string (NULL, arg, args));
1087 s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
1088 LOG (GNUNET_ERROR_TYPE_DEBUG,
1089 "Creating inbound UDP sessions 0x%X for peer `%s' address `%s'\n", s,
1090 GNUNET_i2s (&s->target), udp_address_to_string (NULL, arg, args));
1092 GNUNET_assert (GNUNET_OK ==
1093 GNUNET_CONTAINER_multihashmap_put (plugin->inbound_sessions,
1094 &s->target.hashPubKey, s,
1095 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1098 GNUNET_TIME_relative_to_absolute
1099 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1100 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
1102 GNUNET_SCHEDULER_cancel (s->invalidation_task);
1103 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
1104 LOG (GNUNET_ERROR_TYPE_DEBUG, "Rescheduling %X' `%s'\n", s,
1105 udp_address_to_string (NULL, arg, args));
1107 s->invalidation_task =
1108 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1109 &invalidation_task, s);
1110 /* iterate over all embedded messages */
1111 si.sender = msg->sender;
1115 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1116 ntohs (msg->header.size) -
1117 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1122 * Process a defragmented message.
1124 * @param cls the 'struct ReceiveContext'
1125 * @param msg the message
1128 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1130 struct ReceiveContext *rc = cls;
1132 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1137 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1142 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1143 rc->src_addr, rc->addr_len);
1148 * Transmit an acknowledgement.
1150 * @param cls the 'struct ReceiveContext'
1151 * @param id message ID (unused)
1152 * @param msg ack to transmit
1155 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1157 struct ReceiveContext *rc = cls;
1159 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1161 struct UDP_ACK_Message *udp_ack;
1166 s = find_inbound_session_by_addr (rc->plugin, rc->src_addr, rc->addr_len);
1169 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1170 delay = s->flow_delay_for_other_peer.rel_value;
1177 LOG (GNUNET_ERROR_TYPE_DEBUG,
1178 "Sending ACK to `%s' including delay of %u ms\n",
1179 GNUNET_a2s (rc->src_addr,
1180 (rc->src_addr->sa_family ==
1181 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1185 udp_ack = (struct UDP_ACK_Message *) buf;
1186 udp_ack->header.size = htons ((uint16_t) msize);
1187 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1188 udp_ack->delay = htonl (delay);
1189 udp_ack->sender = *rc->plugin->env->my_identity;
1190 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1191 (void) udp_send (rc->plugin, rc->src_addr, &udp_ack->header);
1196 * Closure for 'find_receive_context'.
1198 struct FindReceiveContext
1201 * Where to store the result.
1203 struct ReceiveContext *rc;
1208 const struct sockaddr *addr;
1211 * Number of bytes in 'addr'.
1215 struct Session *session;
1220 * Scan the heap for a receive context with the given address.
1222 * @param cls the 'struct FindReceiveContext'
1223 * @param node internal node of the heap
1224 * @param element value stored at the node (a 'struct ReceiveContext')
1225 * @param cost cost associated with the node
1226 * @return GNUNET_YES if we should continue to iterate,
1230 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1231 void *element, GNUNET_CONTAINER_HeapCostType cost)
1233 struct FindReceiveContext *frc = cls;
1234 struct ReceiveContext *e = element;
1236 if ((frc->addr_len == e->addr_len) &&
1237 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1247 struct Plugin *plugin;
1249 struct IPv4UdpAddress addr;
1254 struct Plugin *plugin;
1256 struct IPv6UdpAddress addr;
1261 * Read and process a message from the given socket.
1263 * @param plugin the overall plugin
1264 * @param rsock socket to read from
1267 udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1273 const struct GNUNET_MessageHeader *msg;
1274 const struct GNUNET_MessageHeader *ack;
1275 struct Session *peer_session;
1276 const struct UDP_ACK_Message *udp_ack;
1277 struct ReceiveContext *rc;
1278 struct GNUNET_TIME_Absolute now;
1279 struct FindReceiveContext frc;
1280 struct Session *s = NULL;
1281 struct GNUNET_TIME_Relative flow_delay;
1283 fromlen = sizeof (addr);
1284 memset (&addr, 0, sizeof (addr));
1286 GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1287 (struct sockaddr *) &addr, &fromlen);
1288 if (ret < sizeof (struct GNUNET_MessageHeader))
1290 GNUNET_break_op (0);
1293 msg = (const struct GNUNET_MessageHeader *) buf;
1295 LOG (GNUNET_ERROR_TYPE_DEBUG,
1296 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1297 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1299 if (ret != ntohs (msg->size))
1301 GNUNET_break_op (0);
1304 switch (ntohs (msg->type))
1306 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1308 if (fromlen == sizeof (struct sockaddr_in))
1310 LOG (GNUNET_ERROR_TYPE_DEBUG,
1311 "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
1312 ret, GNUNET_a2s ((const struct sockaddr *) &addr, fromlen));
1314 struct Mstv4Context *mc;
1316 mc = GNUNET_malloc (sizeof (struct Mstv4Context));
1317 struct sockaddr_in *av4 = (struct sockaddr_in *) &addr;
1319 mc->addr.ipv4_addr = av4->sin_addr.s_addr;
1320 mc->addr.u4_port = av4->sin_port;
1322 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, ret,
1323 GNUNET_NO, GNUNET_NO))
1326 else if (fromlen == sizeof (struct sockaddr_in6))
1328 LOG (GNUNET_ERROR_TYPE_DEBUG,
1329 "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
1330 ret, GNUNET_a2s ((const struct sockaddr *) &addr, fromlen));
1332 struct Mstv6Context *mc;
1334 mc = GNUNET_malloc (sizeof (struct Mstv6Context));
1335 struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) &addr;
1337 mc->addr.ipv6_addr = av6->sin6_addr;
1338 mc->addr.u6_port = av6->sin6_port;
1341 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, ret,
1342 GNUNET_NO, GNUNET_NO))
1347 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1348 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1350 GNUNET_break_op (0);
1353 process_udp_message (plugin, (const struct UDPMessage *) msg,
1354 (const struct sockaddr *) addr, fromlen);
1356 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1358 if (ntohs (msg->size) <
1359 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1361 GNUNET_break_op (0);
1364 udp_ack = (const struct UDP_ACK_Message *) msg;
1365 s = find_inbound_session (plugin, &udp_ack->sender, addr, fromlen);
1368 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1370 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1371 flow_delay.rel_value);
1373 s->flow_delay_from_other_peer =
1374 GNUNET_TIME_relative_to_absolute (flow_delay);
1376 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1377 if (ntohs (ack->size) !=
1378 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1380 GNUNET_break_op (0);
1384 LOG (GNUNET_ERROR_TYPE_DEBUG,
1385 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1386 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1387 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1390 peer_session = find_session (plugin, &udp_ack->sender);
1391 if (NULL == peer_session)
1394 LOG (GNUNET_ERROR_TYPE_DEBUG,
1395 "Session for ACK not found, dropping ACK!\n");
1399 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
1401 GNUNET_assert (GNUNET_OK ==
1402 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
1406 plugin->last_expected_delay =
1407 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
1408 if (peer_session->cont != NULL)
1409 peer_session->cont (peer_session->cont_cls, &udp_ack->sender, GNUNET_OK);
1410 GNUNET_free (peer_session);
1412 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1414 frc.addr = (const struct sockaddr *) addr;
1415 frc.addr_len = fromlen;
1416 GNUNET_CONTAINER_heap_iterate (plugin->defrags, &find_receive_context,
1418 now = GNUNET_TIME_absolute_get ();
1422 /* need to create a new RC */
1423 rc = GNUNET_malloc (sizeof (struct ReceiveContext) + fromlen);
1424 memcpy (&rc[1], addr, fromlen);
1425 rc->src_addr = (const struct sockaddr *) &rc[1];
1426 rc->addr_len = fromlen;
1427 rc->plugin = plugin;
1429 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1430 UDP_MAX_MESSAGES_IN_DEFRAG, rc,
1431 &fragment_msg_proc, &ack_proc);
1433 GNUNET_CONTAINER_heap_insert (plugin->defrags, rc,
1434 (GNUNET_CONTAINER_HeapCostType)
1438 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1439 (unsigned int) ntohs (msg->size),
1440 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1443 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
1445 /* keep this 'rc' from expiring */
1446 GNUNET_CONTAINER_heap_update_cost (plugin->defrags, rc->hnode,
1447 (GNUNET_CONTAINER_HeapCostType)
1450 if (GNUNET_CONTAINER_heap_get_size (plugin->defrags) >
1451 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1453 /* remove 'rc' that was inactive the longest */
1454 rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags);
1455 GNUNET_assert (NULL != rc);
1456 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1461 GNUNET_break_op (0);
1468 * We have been notified that our writeset has something to read. We don't
1469 * know which socket needs to be read, so we have to check each one
1470 * Then reschedule this function to be called again once more is available.
1472 * @param cls the plugin handle
1473 * @param tc the scheduling context (for rescheduling this function again)
1476 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1478 struct Plugin *plugin = cls;
1480 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1481 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1483 if ((NULL != plugin->sockv4) &&
1484 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1485 udp_read (plugin, plugin->sockv4);
1486 if ((NULL != plugin->sockv6) &&
1487 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1488 udp_read (plugin, plugin->sockv6);
1489 plugin->select_task =
1490 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1491 GNUNET_SCHEDULER_NO_TASK,
1492 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1493 NULL, &udp_plugin_select, plugin);
1499 broadcast_ipv4_mst_cb (void *cls, void *client,
1500 const struct GNUNET_MessageHeader *message)
1502 struct Plugin *plugin = cls;
1503 struct Mstv4Context *mc = client;
1504 const struct GNUNET_MessageHeader *hello;
1505 struct UDP_Beacon_Message *msg;
1507 msg = (struct UDP_Beacon_Message *) message;
1509 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
1510 ntohs (msg->header.type))
1513 LOG (GNUNET_ERROR_TYPE_DEBUG,
1514 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
1515 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1516 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
1518 struct GNUNET_ATS_Information ats;
1520 ats.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1521 ats.value = htonl (1);
1523 hello = (struct GNUNET_MessageHeader *) &msg[1];
1524 plugin->env->receive (plugin->env->cls, &msg->sender, hello, &ats, 1, NULL,
1525 (const char *) &mc->addr, sizeof (mc->addr));
1527 GNUNET_STATISTICS_update (plugin->env->stats,
1529 ("# IPv4 broadcast HELLO beacons received via udp"),
1536 broadcast_ipv6_mst_cb (void *cls, void *client,
1537 const struct GNUNET_MessageHeader *message)
1540 struct Plugin *plugin = cls;
1541 struct Mstv6Context *mc = client;
1542 const struct GNUNET_MessageHeader *hello;
1543 struct UDP_Beacon_Message *msg;
1545 msg = (struct UDP_Beacon_Message *) message;
1547 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
1548 ntohs (msg->header.type))
1551 LOG (GNUNET_ERROR_TYPE_DEBUG,
1552 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
1553 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1554 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
1556 struct GNUNET_ATS_Information ats;
1558 ats.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1559 ats.value = htonl (1);
1561 hello = (struct GNUNET_MessageHeader *) &msg[1];
1562 plugin->env->receive (plugin->env->cls, &msg->sender, hello, &ats, 1, NULL,
1563 (const char *) &mc->addr, sizeof (mc->addr));
1565 GNUNET_STATISTICS_update (plugin->env->stats,
1567 ("# IPv6 multicast HELLO beacons received via udp"),
1574 udp_ipv4_broadcast_send (void *cls,
1575 const struct GNUNET_SCHEDULER_TaskContext *tc)
1577 struct Plugin *plugin = cls;
1580 uint16_t hello_size;
1583 const struct GNUNET_MessageHeader *hello;
1584 struct UDP_Beacon_Message *msg;
1585 struct BroadcastAddress *baddr;
1587 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
1589 hello = plugin->env->get_our_hello ();
1590 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1591 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
1593 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
1594 (msg_size > (UDP_MTU)))
1597 msg = (struct UDP_Beacon_Message *) buf;
1598 msg->sender = *(plugin->env->my_identity);
1599 msg->header.size = ntohs (msg_size);
1600 msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
1601 memcpy (&msg[1], hello, hello_size);
1604 baddr = plugin->ipv4_broadcast_head;
1606 while ((baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
1608 struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
1610 addr->sin_port = htons (plugin->port);
1613 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, msg_size,
1614 (const struct sockaddr *) addr,
1616 if (sent == GNUNET_SYSERR)
1617 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1619 LOG (GNUNET_ERROR_TYPE_DEBUG,
1620 "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
1621 GNUNET_a2s (baddr->addr, baddr->addrlen));
1622 baddr = baddr->next;
1625 plugin->send_ipv4_broadcast_task =
1626 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
1627 &udp_ipv4_broadcast_send, plugin);
1631 udp_ipv6_broadcast_send (void *cls,
1632 const struct GNUNET_SCHEDULER_TaskContext *tc)
1634 struct Plugin *plugin = cls;
1637 uint16_t hello_size;
1640 const struct GNUNET_MessageHeader *hello;
1641 struct UDP_Beacon_Message *msg;
1643 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
1645 hello = plugin->env->get_our_hello ();
1646 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1647 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
1649 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
1650 (msg_size > (UDP_MTU)))
1653 msg = (struct UDP_Beacon_Message *) buf;
1654 msg->sender = *(plugin->env->my_identity);
1655 msg->header.size = ntohs (msg_size);
1656 msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
1657 memcpy (&msg[1], hello, hello_size);
1661 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, msg_size,
1662 (const struct sockaddr *)
1663 &plugin->ipv6_multicast_address,
1664 sizeof (struct sockaddr_in6));
1665 if (sent == GNUNET_SYSERR)
1666 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1668 LOG (GNUNET_ERROR_TYPE_DEBUG,
1669 "Sending IPv6 HELLO beacon broadcast with %i bytes to address %s\n",
1671 GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
1672 sizeof (struct sockaddr_in6)));
1676 plugin->send_ipv6_broadcast_task =
1677 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
1678 &udp_ipv6_broadcast_send, plugin);
1682 * Check if the given port is plausible (must be either our listen
1683 * port or our advertised port). If it is neither, we return
1686 * @param plugin global variables
1687 * @param in_port port number to check
1688 * @return GNUNET_OK if port is either open_port or adv_port
1691 check_port (struct Plugin *plugin, uint16_t in_port)
1693 if ((in_port == plugin->port) || (in_port == plugin->aport))
1695 return GNUNET_SYSERR;
1700 * Function that will be called to check if a binary address for this
1701 * plugin is well-formed and corresponds to an address for THIS peer
1702 * (as per our configuration). Naturally, if absolutely necessary,
1703 * plugins can be a bit conservative in their answer, but in general
1704 * plugins should make sure that the address does not redirect
1705 * traffic to a 3rd party that might try to man-in-the-middle our
1708 * @param cls closure, should be our handle to the Plugin
1709 * @param addr pointer to the address
1710 * @param addrlen length of addr
1711 * @return GNUNET_OK if this is a plausible address for this peer
1712 * and transport, GNUNET_SYSERR if not
1716 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1718 struct Plugin *plugin = cls;
1719 struct IPv4UdpAddress *v4;
1720 struct IPv6UdpAddress *v6;
1722 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1723 (addrlen != sizeof (struct IPv6UdpAddress)))
1725 GNUNET_break_op (0);
1726 return GNUNET_SYSERR;
1728 if (addrlen == sizeof (struct IPv4UdpAddress))
1730 v4 = (struct IPv4UdpAddress *) addr;
1731 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1732 return GNUNET_SYSERR;
1734 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1735 sizeof (struct in_addr)))
1736 return GNUNET_SYSERR;
1740 v6 = (struct IPv6UdpAddress *) addr;
1741 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1743 GNUNET_break_op (0);
1744 return GNUNET_SYSERR;
1746 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1747 return GNUNET_SYSERR;
1749 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1750 sizeof (struct in6_addr)))
1751 return GNUNET_SYSERR;
1758 * Function called for a quick conversion of the binary address to
1759 * a numeric address. Note that the caller must not free the
1760 * address and that the next call to this function is allowed
1761 * to override the address again.
1763 * @param cls closure
1764 * @param addr binary address
1765 * @param addrlen length of the address
1766 * @return string representing the same address
1769 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
1771 static char rbuf[INET6_ADDRSTRLEN + 10];
1772 char buf[INET6_ADDRSTRLEN];
1776 const struct IPv4UdpAddress *t4;
1777 const struct IPv6UdpAddress *t6;
1781 if (addrlen == sizeof (struct IPv6UdpAddress))
1785 port = ntohs (t6->u6_port);
1786 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
1789 else if (addrlen == sizeof (struct IPv4UdpAddress))
1793 port = ntohs (t4->u4_port);
1794 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
1799 GNUNET_break_op (0);
1802 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1803 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
1810 * Closure for 'append_port'.
1812 struct PrettyPrinterContext
1815 * Function to call with the result.
1817 GNUNET_TRANSPORT_AddressStringCallback asc;
1820 * Clsoure for 'asc'.
1825 * Port to add after the IP address.
1832 * Append our port and forward the result.
1834 * @param cls a 'struct PrettyPrinterContext'
1835 * @param hostname result from DNS resolver
1838 append_port (void *cls, const char *hostname)
1840 struct PrettyPrinterContext *ppc = cls;
1843 if (hostname == NULL)
1845 ppc->asc (ppc->asc_cls, NULL);
1849 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1850 ppc->asc (ppc->asc_cls, ret);
1856 * Convert the transports address to a nice, human-readable
1859 * @param cls closure
1860 * @param type name of the transport that generated the address
1861 * @param addr one of the addresses of the host, NULL for the last address
1862 * the specific address format depends on the transport
1863 * @param addrlen length of the address
1864 * @param numeric should (IP) addresses be displayed in numeric form?
1865 * @param timeout after how long should we give up?
1866 * @param asc function to call on each string
1867 * @param asc_cls closure for asc
1870 udp_plugin_address_pretty_printer (void *cls, const char *type,
1871 const void *addr, size_t addrlen,
1873 struct GNUNET_TIME_Relative timeout,
1874 GNUNET_TRANSPORT_AddressStringCallback asc,
1877 struct PrettyPrinterContext *ppc;
1880 struct sockaddr_in a4;
1881 struct sockaddr_in6 a6;
1882 const struct IPv4UdpAddress *u4;
1883 const struct IPv6UdpAddress *u6;
1886 if (addrlen == sizeof (struct IPv6UdpAddress))
1889 memset (&a6, 0, sizeof (a6));
1890 a6.sin6_family = AF_INET6;
1891 #if HAVE_SOCKADDR_IN_SIN_LEN
1892 a6.sin6_len = sizeof (a6);
1894 a6.sin6_port = u6->u6_port;
1895 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1896 port = ntohs (u6->u6_port);
1900 else if (addrlen == sizeof (struct IPv4UdpAddress))
1903 memset (&a4, 0, sizeof (a4));
1904 a4.sin_family = AF_INET;
1905 #if HAVE_SOCKADDR_IN_SIN_LEN
1906 a4.sin_len = sizeof (a4);
1908 a4.sin_port = u4->u4_port;
1909 a4.sin_addr.s_addr = u4->ipv4_addr;
1910 port = ntohs (u4->u4_port);
1916 /* invalid address */
1917 GNUNET_break_op (0);
1918 asc (asc_cls, NULL);
1921 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1923 ppc->asc_cls = asc_cls;
1925 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1930 * Our external IP address/port mapping has changed.
1932 * @param cls closure, the 'struct LocalAddrList'
1933 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1934 * the previous (now invalid) one
1935 * @param addr either the previous or the new public IP address
1936 * @param addrlen actual lenght of the address
1939 udp_nat_port_map_callback (void *cls, int add_remove,
1940 const struct sockaddr *addr, socklen_t addrlen)
1942 struct Plugin *plugin = cls;
1943 struct IPv4UdpAddress u4;
1944 struct IPv6UdpAddress u6;
1948 /* convert 'addr' to our internal format */
1949 switch (addr->sa_family)
1952 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1953 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1954 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1959 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1960 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1961 sizeof (struct in6_addr));
1962 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1970 /* modify our published address list */
1971 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1976 iface_proc (void *cls, const char *name, int isDefault,
1977 const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
1978 const struct sockaddr *netmask, socklen_t addrlen)
1980 struct Plugin *plugin = cls;
1984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
1985 GNUNET_a2s (addr, addrlen), name, addr);
1986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1987 "broadcast address %s for interface %s %p\n ",
1988 GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
1989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
1990 GNUNET_a2s (netmask, addrlen), name, netmask);
1993 /* Collecting broadcast addresses */
1994 if (broadcast_addr != NULL)
1996 struct BroadcastAddress *ba =
1997 GNUNET_malloc (sizeof (struct BroadcastAddress));
1998 ba->addr = GNUNET_malloc (addrlen);
1999 memcpy (ba->addr, broadcast_addr, addrlen);
2000 ba->addrlen = addrlen;
2001 GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
2002 plugin->ipv4_broadcast_tail, ba);
2010 * The exported method. Makes the core api available via a global and
2011 * returns the udp transport API.
2013 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2014 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2017 libgnunet_plugin_transport_udp_init (void *cls)
2019 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2020 unsigned long long port;
2021 unsigned long long aport;
2022 struct GNUNET_TRANSPORT_PluginFunctions *api;
2023 struct Plugin *plugin;
2024 int sockets_created;
2026 struct GNUNET_TIME_Relative interval;
2027 struct sockaddr_in serverAddrv4;
2028 struct sockaddr_in6 serverAddrv6;
2029 struct sockaddr *serverAddr;
2030 struct sockaddr *addrs[2];
2031 socklen_t addrlens[2];
2034 unsigned long long udp_max_bps;
2037 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
2042 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
2044 if (broadcast == GNUNET_SYSERR)
2045 broadcast = GNUNET_NO;
2047 if (GNUNET_SYSERR ==
2048 GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
2049 "BROADCAST_INTERVAL", &interval))
2050 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
2053 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2054 "MAX_BPS", &udp_max_bps))
2055 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
2057 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2058 "ADVERTISED_PORT", &aport))
2062 LOG (GNUNET_ERROR_TYPE_WARNING,
2063 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
2067 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
2068 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
2070 plugin = GNUNET_malloc (sizeof (struct Plugin));
2071 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
2072 GNUNET_BANDWIDTH_value_init ((uint32_t)
2074 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
2075 plugin->port = port;
2076 plugin->aport = aport;
2078 plugin->broadcast_interval = interval;
2079 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2082 api->send = &udp_plugin_send;
2083 api->disconnect = &udp_disconnect;
2084 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2085 api->address_to_string = &udp_address_to_string;
2086 api->check_address = &udp_plugin_check_address;
2089 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2090 "BINDTO", &plugin->bind4_address))
2092 LOG (GNUNET_ERROR_TYPE_DEBUG,
2093 "Binding udp plugin to specific address: `%s'\n",
2094 plugin->bind4_address);
2095 if (1 != inet_pton (AF_INET, plugin->bind4_address, &serverAddrv4.sin_addr))
2097 GNUNET_free (plugin->bind4_address);
2098 GNUNET_free (plugin);
2105 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2106 "BINDTO6", &plugin->bind6_address))
2108 LOG (GNUNET_ERROR_TYPE_DEBUG,
2109 "Binding udp plugin to specific address: `%s'\n",
2110 plugin->bind6_address);
2112 inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
2114 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
2115 plugin->bind6_address);
2116 GNUNET_free_non_null (plugin->bind4_address);
2117 GNUNET_free (plugin->bind6_address);
2118 GNUNET_free (plugin);
2125 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2127 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
2129 plugin->inbound_sessions =
2130 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
2132 sockets_created = 0;
2134 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
2137 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
2138 if (NULL == plugin->sockv6)
2140 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
2144 #if HAVE_SOCKADDR_IN_SIN_LEN
2145 serverAddrv6.sin6_len = sizeof (serverAddrv6);
2147 serverAddrv6.sin6_family = AF_INET6;
2148 serverAddrv6.sin6_addr = in6addr_any;
2149 serverAddrv6.sin6_port = htons (plugin->port);
2150 addrlen = sizeof (serverAddrv6);
2151 serverAddr = (struct sockaddr *) &serverAddrv6;
2153 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
2154 ntohs (serverAddrv6.sin6_port));
2157 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
2160 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
2162 LOG (GNUNET_ERROR_TYPE_DEBUG,
2163 "IPv6 Binding failed, trying new port %d\n",
2164 ntohs (serverAddrv6.sin6_port));
2169 GNUNET_NETWORK_socket_close (plugin->sockv6);
2170 plugin->sockv6 = NULL;
2174 if (plugin->sockv6 != NULL)
2176 addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
2177 addrlens[sockets_created] = sizeof (serverAddrv6);
2184 GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
2185 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
2186 if (NULL == plugin->sockv4)
2188 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
2192 #if HAVE_SOCKADDR_IN_SIN_LEN
2193 serverAddrv4.sin_len = sizeof (serverAddrv4);
2195 serverAddrv4.sin_family = AF_INET;
2196 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
2197 serverAddrv4.sin_port = htons (plugin->port);
2198 addrlen = sizeof (serverAddrv4);
2199 serverAddr = (struct sockaddr *) &serverAddrv4;
2201 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
2202 ntohs (serverAddrv4.sin_port));
2205 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
2208 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
2210 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
2211 ntohs (serverAddrv4.sin_port));
2216 GNUNET_NETWORK_socket_close (plugin->sockv4);
2217 plugin->sockv4 = NULL;
2221 if (plugin->sockv4 != NULL)
2223 addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
2224 addrlens[sockets_created] = sizeof (serverAddrv4);
2229 plugin->rs = GNUNET_NETWORK_fdset_create ();
2230 GNUNET_NETWORK_fdset_zero (plugin->rs);
2231 if (NULL != plugin->sockv4)
2232 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
2233 if (NULL != plugin->sockv6)
2234 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
2236 plugin->select_task =
2237 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2238 GNUNET_SCHEDULER_NO_TASK,
2239 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
2240 NULL, &udp_plugin_select, plugin);
2246 /* create IPv4 broadcast socket */
2247 plugin->broadcast_ipv4 = GNUNET_NO;
2248 if (plugin->sockv4 != NULL)
2252 if (GNUNET_NETWORK_socket_setsockopt
2253 (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
2254 sizeof (int)) != GNUNET_OK)
2256 LOG (GNUNET_ERROR_TYPE_WARNING,
2258 ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
2259 ntohs (serverAddrv4.sin_port));
2263 GNUNET_OS_network_interfaces_list (iface_proc, plugin);
2264 plugin->send_ipv4_broadcast_task =
2265 GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
2267 plugin->broadcast_ipv4_mst =
2268 GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
2270 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
2271 plugin->broadcast_ipv4 = GNUNET_YES;
2275 plugin->broadcast_ipv6 = GNUNET_NO;
2276 if (plugin->sockv6 != NULL)
2278 memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
2280 inet_pton (AF_INET6, "FF05::13B",
2281 &plugin->ipv6_multicast_address.sin6_addr));
2283 plugin->ipv6_multicast_address.sin6_family = AF_INET6;
2284 plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
2286 plugin->broadcast_ipv6_mst =
2287 GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
2289 /* Create IPv6 multicast request */
2290 struct ipv6_mreq multicastRequest;
2292 multicastRequest.ipv6mr_multiaddr =
2293 plugin->ipv6_multicast_address.sin6_addr;
2294 /* TODO: 0 selects the "best" interface, tweak to use all interfaces
2296 * http://tools.ietf.org/html/rfc2553#section-5.2:
2300 * Join a multicast group on a specified local interface. If the
2301 * interface index is specified as 0, the kernel chooses the local
2302 * interface. For example, some kernels look up the multicast
2303 * group in the normal IPv6 routing table and using the resulting
2306 multicastRequest.ipv6mr_interface = 0;
2308 /* Join the multicast group */
2309 if (GNUNET_NETWORK_socket_setsockopt
2310 (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
2311 (char *) &multicastRequest, sizeof (multicastRequest)) == GNUNET_OK)
2313 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
2315 plugin->send_ipv6_broadcast_task =
2316 GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
2317 plugin->broadcast_ipv6 = GNUNET_YES;
2320 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting not running\n");
2324 if (sockets_created == 0)
2325 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2327 GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
2328 (const struct sockaddr **) addrs, addrlens,
2329 &udp_nat_port_map_callback, NULL, plugin);
2334 * Shutdown the plugin.
2336 * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
2340 libgnunet_plugin_transport_udp_done (void *cls)
2342 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2343 struct Plugin *plugin = api->cls;
2344 struct ReceiveContext *rc;
2346 /* FIXME: clean up heap and hashmap */
2347 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
2349 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2350 plugin->sessions = NULL;
2351 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions,
2352 &destroy_inbound_session, NULL);
2353 GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
2354 plugin->inbound_sessions = NULL;
2355 while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
2357 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2360 GNUNET_CONTAINER_heap_destroy (plugin->defrags);
2362 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2364 GNUNET_SCHEDULER_cancel (plugin->select_task);
2365 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2368 if (plugin->broadcast_ipv4)
2370 if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
2372 GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
2373 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
2376 if (plugin->broadcast_ipv4_mst != NULL)
2377 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
2379 while (plugin->ipv4_broadcast_head != NULL)
2381 struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
2383 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
2384 plugin->ipv4_broadcast_tail, p);
2385 GNUNET_free (p->addr);
2390 if (plugin->broadcast_ipv6)
2392 /* Create IPv6 multicast request */
2393 struct ipv6_mreq multicastRequest;
2395 multicastRequest.ipv6mr_multiaddr =
2396 plugin->ipv6_multicast_address.sin6_addr;
2397 multicastRequest.ipv6mr_interface = 0;
2399 /* Join the multicast address */
2400 if (GNUNET_NETWORK_socket_setsockopt
2401 (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
2402 (char *) &multicastRequest, sizeof (multicastRequest)) == 0)
2404 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
2407 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
2409 if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
2411 GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
2412 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
2414 if (plugin->broadcast_ipv6_mst != NULL)
2415 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
2419 if (plugin->sockv4 != NULL)
2421 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2422 plugin->sockv4 = NULL;
2424 if (plugin->sockv6 != NULL)
2426 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2427 plugin->sockv6 = NULL;
2430 GNUNET_SERVER_mst_destroy (plugin->mst);
2431 GNUNET_NETWORK_fdset_destroy (plugin->rs);
2433 GNUNET_NAT_unregister (plugin->nat);
2435 GNUNET_free (plugin);
2440 /* end of plugin_transport_udp.c */