2 This file is part of GNUnet
3 (C) 2010, 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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18 Boston, MA 02111-1307, USA.
22 * @file transport/plugin_transport_udp_broadcasting.c
23 * @brief Neighbour discovery with UDP
24 * @author Christian Grothoff
25 * @author Matthias Wachs
28 #include "plugin_transport_udp.h"
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 struct UDP_Beacon_Message
50 struct GNUNET_MessageHeader header;
53 * What is the identity of the sender
55 struct GNUNET_PeerIdentity sender;
59 struct BroadcastAddress
61 struct BroadcastAddress *next;
62 struct BroadcastAddress *prev;
71 struct Plugin *plugin;
73 struct IPv4UdpAddress addr;
75 * ATS network type in NBO
77 uint32_t ats_address_network_type;
82 struct Plugin *plugin;
84 struct IPv6UdpAddress addr;
86 * ATS network type in NBO
88 uint32_t ats_address_network_type;
93 broadcast_ipv6_mst_cb (void *cls, void *client,
94 const struct GNUNET_MessageHeader *message)
97 struct Plugin *plugin = cls;
98 struct Mstv6Context *mc = client;
99 const struct GNUNET_MessageHeader *hello;
100 const struct UDP_Beacon_Message *msg;
101 struct GNUNET_ATS_Information atsi;
103 msg = (const struct UDP_Beacon_Message *) message;
105 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
106 ntohs (msg->header.type))
108 LOG (GNUNET_ERROR_TYPE_DEBUG,
109 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
110 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
111 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
114 atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE);
115 atsi.value = mc->ats_address_network_type;
116 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
118 hello = (struct GNUNET_MessageHeader *) &msg[1];
119 plugin->env->receive (plugin->env->cls,
123 (const char *) &mc->addr,
125 plugin->env->update_address_metrics (plugin->env->cls,
127 (const char *) &mc->addr,
132 GNUNET_STATISTICS_update (plugin->env->stats,
134 ("# IPv6 multicast HELLO beacons received via udp"),
142 broadcast_ipv4_mst_cb (void *cls, void *client,
143 const struct GNUNET_MessageHeader *message)
145 struct Plugin *plugin = cls;
146 struct Mstv4Context *mc = client;
147 const struct GNUNET_MessageHeader *hello;
148 struct UDP_Beacon_Message *msg;
150 msg = (struct UDP_Beacon_Message *) message;
152 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
153 ntohs (msg->header.type))
155 LOG (GNUNET_ERROR_TYPE_DEBUG,
156 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
157 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
158 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
160 struct GNUNET_ATS_Information atsi[2];
163 atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
164 atsi[0].value = htonl (1);
165 atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
166 atsi[1].value = mc->ats_address_network_type;
167 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
169 hello = (struct GNUNET_MessageHeader *) &msg[1];
170 plugin->env->receive (plugin->env->cls,
174 (const char *) &mc->addr,
177 plugin->env->update_address_metrics (plugin->env->cls,
179 (const char *) &mc->addr,
182 (struct GNUNET_ATS_Information *) &atsi, 2);
184 GNUNET_STATISTICS_update (plugin->env->stats,
186 ("# IPv4 broadcast HELLO beacons received via udp"),
193 udp_broadcast_receive (struct Plugin *plugin, const char * buf, ssize_t size, struct sockaddr *addr, size_t addrlen)
195 struct GNUNET_ATS_Information ats;
197 if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in)))
199 LOG (GNUNET_ERROR_TYPE_DEBUG,
200 "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
201 size, GNUNET_a2s ((const struct sockaddr *) addr, addrlen));
202 struct Mstv4Context *mc;
204 mc = GNUNET_malloc (sizeof (struct Mstv4Context));
205 struct sockaddr_in *av4 = (struct sockaddr_in *) addr;
207 mc->addr.ipv4_addr = av4->sin_addr.s_addr;
208 mc->addr.u4_port = av4->sin_port;
209 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
210 mc->ats_address_network_type = ats.value;
212 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
214 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, size,
215 GNUNET_NO, GNUNET_NO))
218 else if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in6)))
220 LOG (GNUNET_ERROR_TYPE_DEBUG,
221 "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
222 size, GNUNET_a2s ((const struct sockaddr *) &addr, addrlen));
223 struct Mstv6Context *mc;
225 mc = GNUNET_malloc (sizeof (struct Mstv6Context));
226 struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) addr;
228 mc->addr.ipv6_addr = av6->sin6_addr;
229 mc->addr.u6_port = av6->sin6_port;
230 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
231 mc->ats_address_network_type = ats.value;
232 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
234 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, size,
235 GNUNET_NO, GNUNET_NO))
241 prepare_beacon (struct Plugin *plugin, struct UDP_Beacon_Message *msg)
246 const struct GNUNET_MessageHeader *hello;
247 hello = plugin->env->get_our_hello ();
250 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
251 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
253 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
254 (msg_size > (UDP_MTU)))
257 msg->sender = *(plugin->env->my_identity);
258 msg->header.size = htons (msg_size);
259 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
260 memcpy (&msg[1], hello, hello_size);
265 udp_ipv4_broadcast_send (void *cls,
266 const struct GNUNET_SCHEDULER_TaskContext *tc)
268 struct Plugin *plugin = cls;
271 char buf[65536] GNUNET_ALIGN;
272 struct BroadcastAddress *baddr;
274 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
276 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
278 baddr = plugin->ipv4_broadcast_head;
280 while ((msg_size > 0) && (baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
282 struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
284 addr->sin_port = htons (plugin->port);
286 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv4, &buf, msg_size,
287 (const struct sockaddr *) addr,
289 if (sent == GNUNET_SYSERR)
291 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
293 /* "Network unreachable" or "Network down"
295 * This indicates that we just do not have network connectivity
297 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
298 "Network connectivity is down, cannot send beacon!\n");
301 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
305 LOG (GNUNET_ERROR_TYPE_DEBUG,
306 "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
307 GNUNET_a2s (baddr->addr, baddr->addrlen));
312 plugin->send_ipv4_broadcast_task =
313 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
314 &udp_ipv4_broadcast_send, plugin);
318 udp_ipv6_broadcast_send (void *cls,
319 const struct GNUNET_SCHEDULER_TaskContext *tc)
321 struct Plugin *plugin = cls;
324 char buf[65536] GNUNET_ALIGN;
326 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
328 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
330 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv6, &buf, msg_size,
331 (const struct sockaddr *)
332 &plugin->ipv6_multicast_address,
333 sizeof (struct sockaddr_in6));
334 if (sent == GNUNET_SYSERR)
336 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
338 /* "Network unreachable" or "Network down"
340 * This indicates that this system is IPv6 enabled, but does not
341 * have a valid global IPv6 address assigned
343 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
344 "Network connectivity is down, cannot send beacon!\n");
347 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
351 LOG (GNUNET_ERROR_TYPE_DEBUG,
352 "Sending IPv6 HELLO beacon broadcast with %i bytes to address %s\n",
354 GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
355 sizeof (struct sockaddr_in6)));
357 plugin->send_ipv6_broadcast_task =
358 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
359 &udp_ipv6_broadcast_send, plugin);
364 iface_proc (void *cls, const char *name, int isDefault,
365 const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
366 const struct sockaddr *netmask, socklen_t addrlen)
368 struct Plugin *plugin = cls;
372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
373 GNUNET_a2s (addr, addrlen), name, addr);
374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
375 "broadcast address %s for interface %s %p\n ",
376 GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
378 GNUNET_a2s (netmask, addrlen), name, netmask);
380 /* Collecting broadcast addresses */
381 if (broadcast_addr != NULL)
383 struct BroadcastAddress *ba =
384 GNUNET_malloc (sizeof (struct BroadcastAddress));
385 ba->addr = GNUNET_malloc (addrlen);
386 memcpy (ba->addr, broadcast_addr, addrlen);
387 ba->addrlen = addrlen;
388 GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
389 plugin->ipv4_broadcast_tail, ba);
397 setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
399 /* create IPv4 broadcast socket */
400 plugin->broadcast_ipv4 = GNUNET_NO;
401 if (plugin->sockv4 != NULL)
405 if (GNUNET_NETWORK_socket_setsockopt
406 (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
407 sizeof (int)) != GNUNET_OK)
409 LOG (GNUNET_ERROR_TYPE_WARNING,
411 ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
412 ntohs (serverAddrv4->sin_port));
416 GNUNET_OS_network_interfaces_list (iface_proc, plugin);
417 plugin->send_ipv4_broadcast_task =
418 GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
420 plugin->broadcast_ipv4_mst =
421 GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
423 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
424 plugin->broadcast_ipv4 = GNUNET_YES;
428 plugin->broadcast_ipv6 = GNUNET_NO;
429 if (plugin->sockv6 != NULL)
431 memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
433 inet_pton (AF_INET6, "FF05::13B",
434 &plugin->ipv6_multicast_address.sin6_addr));
436 plugin->ipv6_multicast_address.sin6_family = AF_INET6;
437 plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
439 plugin->broadcast_ipv6_mst =
440 GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
442 /* Create IPv6 multicast request */
443 struct ipv6_mreq multicastRequest;
445 multicastRequest.ipv6mr_multiaddr =
446 plugin->ipv6_multicast_address.sin6_addr;
447 /* TODO: 0 selects the "best" interface, tweak to use all interfaces
449 * http://tools.ietf.org/html/rfc2553#section-5.2:
453 * Join a multicast group on a specified local interface. If the
454 * interface index is specified as 0, the kernel chooses the local
455 * interface. For example, some kernels look up the multicast
456 * group in the normal IPv6 routing table and using the resulting
459 multicastRequest.ipv6mr_interface = 0;
461 /* Join the multicast group */
462 if (GNUNET_NETWORK_socket_setsockopt
463 (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
464 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
466 LOG (GNUNET_ERROR_TYPE_WARNING,
467 "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
471 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
472 plugin->send_ipv6_broadcast_task =
473 GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
474 plugin->broadcast_ipv6 = GNUNET_YES;
480 stop_broadcast (struct Plugin *plugin)
482 if (plugin->broadcast_ipv4)
484 if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
486 GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
487 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
490 if (plugin->broadcast_ipv4_mst != NULL)
491 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
493 while (plugin->ipv4_broadcast_head != NULL)
495 struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
497 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
498 plugin->ipv4_broadcast_tail, p);
499 GNUNET_free (p->addr);
504 if (plugin->broadcast_ipv6)
506 /* Create IPv6 multicast request */
507 struct ipv6_mreq multicastRequest;
509 multicastRequest.ipv6mr_multiaddr =
510 plugin->ipv6_multicast_address.sin6_addr;
511 multicastRequest.ipv6mr_interface = 0;
513 /* Join the multicast address */
514 if (GNUNET_NETWORK_socket_setsockopt
515 (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
516 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
518 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
522 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
525 if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
527 GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
528 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
530 if (plugin->broadcast_ipv6_mst != NULL)
531 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
536 /* end of plugin_transport_udp_broadcasting.c */