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Diffstat (limited to 'src/transport/plugin_transport_udp.c')
-rw-r--r-- | src/transport/plugin_transport_udp.c | 3897 |
1 files changed, 0 insertions, 3897 deletions
diff --git a/src/transport/plugin_transport_udp.c b/src/transport/plugin_transport_udp.c deleted file mode 100644 index 2db31caa3..000000000 --- a/src/transport/plugin_transport_udp.c +++ /dev/null | |||
@@ -1,3897 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2010-2017 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
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 | ||
27 | */ | ||
28 | #include "platform.h" | ||
29 | #include "plugin_transport_udp.h" | ||
30 | #include "gnunet_hello_lib.h" | ||
31 | #include "gnunet_util_lib.h" | ||
32 | #include "gnunet_fragmentation_lib.h" | ||
33 | #include "gnunet_nat_service.h" | ||
34 | #include "gnunet_protocols.h" | ||
35 | #include "gnunet_resolver_service.h" | ||
36 | #include "gnunet_signatures.h" | ||
37 | #include "gnunet_constants.h" | ||
38 | #include "gnunet_statistics_service.h" | ||
39 | #include "gnunet_transport_service.h" | ||
40 | #include "gnunet_transport_plugin.h" | ||
41 | #include "transport.h" | ||
42 | |||
43 | #define LOG(kind, ...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__) | ||
44 | |||
45 | /** | ||
46 | * After how much inactivity should a UDP session time out? | ||
47 | */ | ||
48 | #define UDP_SESSION_TIME_OUT \ | ||
49 | GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60) | ||
50 | |||
51 | /** | ||
52 | * Number of messages we can defragment in parallel. We only really | ||
53 | * defragment 1 message at a time, but if messages get re-ordered, we | ||
54 | * may want to keep knowledge about the previous message to avoid | ||
55 | * discarding the current message in favor of a single fragment of a | ||
56 | * previous message. 3 should be good since we don't expect massive | ||
57 | * message reorderings with UDP. | ||
58 | */ | ||
59 | #define UDP_MAX_MESSAGES_IN_DEFRAG 3 | ||
60 | |||
61 | /** | ||
62 | * We keep a defragmentation queue per sender address. How many | ||
63 | * sender addresses do we support at the same time? Memory consumption | ||
64 | * is roughly a factor of 32k * #UDP_MAX_MESSAGES_IN_DEFRAG times this | ||
65 | * value. (So 128 corresponds to 12 MB and should suffice for | ||
66 | * connecting to roughly 128 peers via UDP). | ||
67 | */ | ||
68 | #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128 | ||
69 | |||
70 | |||
71 | /** | ||
72 | * UDP Message-Packet header (after defragmentation). | ||
73 | */ | ||
74 | struct UDPMessage | ||
75 | { | ||
76 | /** | ||
77 | * Message header. | ||
78 | */ | ||
79 | struct GNUNET_MessageHeader header; | ||
80 | |||
81 | /** | ||
82 | * Always zero for now. | ||
83 | */ | ||
84 | uint32_t reserved; | ||
85 | |||
86 | /** | ||
87 | * What is the identity of the sender | ||
88 | */ | ||
89 | struct GNUNET_PeerIdentity sender; | ||
90 | }; | ||
91 | |||
92 | |||
93 | /** | ||
94 | * Closure for #append_port(). | ||
95 | */ | ||
96 | struct PrettyPrinterContext | ||
97 | { | ||
98 | /** | ||
99 | * DLL | ||
100 | */ | ||
101 | struct PrettyPrinterContext *next; | ||
102 | |||
103 | /** | ||
104 | * DLL | ||
105 | */ | ||
106 | struct PrettyPrinterContext *prev; | ||
107 | |||
108 | /** | ||
109 | * Our plugin. | ||
110 | */ | ||
111 | struct Plugin *plugin; | ||
112 | |||
113 | /** | ||
114 | * Resolver handle | ||
115 | */ | ||
116 | struct GNUNET_RESOLVER_RequestHandle *resolver_handle; | ||
117 | |||
118 | /** | ||
119 | * Function to call with the result. | ||
120 | */ | ||
121 | GNUNET_TRANSPORT_AddressStringCallback asc; | ||
122 | |||
123 | /** | ||
124 | * Clsoure for @e asc. | ||
125 | */ | ||
126 | void *asc_cls; | ||
127 | |||
128 | /** | ||
129 | * Timeout task | ||
130 | */ | ||
131 | struct GNUNET_SCHEDULER_Task *timeout_task; | ||
132 | |||
133 | /** | ||
134 | * Is this an IPv6 address? | ||
135 | */ | ||
136 | int ipv6; | ||
137 | |||
138 | /** | ||
139 | * Options | ||
140 | */ | ||
141 | uint32_t options; | ||
142 | |||
143 | /** | ||
144 | * Port to add after the IP address. | ||
145 | */ | ||
146 | uint16_t port; | ||
147 | }; | ||
148 | |||
149 | |||
150 | /** | ||
151 | * Session with another peer. | ||
152 | */ | ||
153 | struct GNUNET_ATS_Session | ||
154 | { | ||
155 | /** | ||
156 | * Which peer is this session for? | ||
157 | */ | ||
158 | struct GNUNET_PeerIdentity target; | ||
159 | |||
160 | /** | ||
161 | * Tokenizer for inbound messages. | ||
162 | */ | ||
163 | struct GNUNET_MessageStreamTokenizer *mst; | ||
164 | |||
165 | /** | ||
166 | * Plugin this session belongs to. | ||
167 | */ | ||
168 | struct Plugin *plugin; | ||
169 | |||
170 | /** | ||
171 | * Context for dealing with fragments. | ||
172 | */ | ||
173 | struct UDP_FragmentationContext *frag_ctx; | ||
174 | |||
175 | /** | ||
176 | * Desired delay for next sending we send to other peer | ||
177 | */ | ||
178 | struct GNUNET_TIME_Relative flow_delay_for_other_peer; | ||
179 | |||
180 | /** | ||
181 | * Desired delay for transmissions we received from other peer. | ||
182 | * This is for full messages, the value needs to be adjusted for | ||
183 | * fragmented messages. | ||
184 | */ | ||
185 | struct GNUNET_TIME_Relative flow_delay_from_other_peer; | ||
186 | |||
187 | /** | ||
188 | * Session timeout task | ||
189 | */ | ||
190 | struct GNUNET_SCHEDULER_Task *timeout_task; | ||
191 | |||
192 | /** | ||
193 | * When does this session time out? | ||
194 | */ | ||
195 | struct GNUNET_TIME_Absolute timeout; | ||
196 | |||
197 | /** | ||
198 | * What time did we last transmit? | ||
199 | */ | ||
200 | struct GNUNET_TIME_Absolute last_transmit_time; | ||
201 | |||
202 | /** | ||
203 | * expected delay for ACKs | ||
204 | */ | ||
205 | struct GNUNET_TIME_Relative last_expected_ack_delay; | ||
206 | |||
207 | /** | ||
208 | * desired delay between UDP messages | ||
209 | */ | ||
210 | struct GNUNET_TIME_Relative last_expected_msg_delay; | ||
211 | |||
212 | /** | ||
213 | * Our own address. | ||
214 | */ | ||
215 | struct GNUNET_HELLO_Address *address; | ||
216 | |||
217 | /** | ||
218 | * Number of bytes waiting for transmission to this peer. | ||
219 | */ | ||
220 | unsigned long long bytes_in_queue; | ||
221 | |||
222 | /** | ||
223 | * Number of messages waiting for transmission to this peer. | ||
224 | */ | ||
225 | unsigned int msgs_in_queue; | ||
226 | |||
227 | /** | ||
228 | * Reference counter to indicate that this session is | ||
229 | * currently being used and must not be destroyed; | ||
230 | * setting @e in_destroy will destroy it as soon as | ||
231 | * possible. | ||
232 | */ | ||
233 | unsigned int rc; | ||
234 | |||
235 | /** | ||
236 | * Network type of the address. | ||
237 | */ | ||
238 | enum GNUNET_NetworkType scope; | ||
239 | |||
240 | /** | ||
241 | * Is this session about to be destroyed (sometimes we cannot | ||
242 | * destroy a session immediately as below us on the stack | ||
243 | * there might be code that still uses it; in this case, | ||
244 | * @e rc is non-zero). | ||
245 | */ | ||
246 | int in_destroy; | ||
247 | }; | ||
248 | |||
249 | |||
250 | /** | ||
251 | * Data structure to track defragmentation contexts based | ||
252 | * on the source of the UDP traffic. | ||
253 | */ | ||
254 | struct DefragContext | ||
255 | { | ||
256 | /** | ||
257 | * Defragmentation context. | ||
258 | */ | ||
259 | struct GNUNET_DEFRAGMENT_Context *defrag; | ||
260 | |||
261 | /** | ||
262 | * Reference to master plugin struct. | ||
263 | */ | ||
264 | struct Plugin *plugin; | ||
265 | |||
266 | /** | ||
267 | * Node in the defrag heap. | ||
268 | */ | ||
269 | struct GNUNET_CONTAINER_HeapNode *hnode; | ||
270 | |||
271 | /** | ||
272 | * Source address this receive context is for (allocated at the | ||
273 | * end of the struct). | ||
274 | */ | ||
275 | const union UdpAddress *udp_addr; | ||
276 | |||
277 | /** | ||
278 | * Who's message(s) are we defragmenting here? | ||
279 | * Only initialized once we succeeded and | ||
280 | * @e have_sender is set. | ||
281 | */ | ||
282 | struct GNUNET_PeerIdentity sender; | ||
283 | |||
284 | /** | ||
285 | * Length of @e udp_addr. | ||
286 | */ | ||
287 | size_t udp_addr_len; | ||
288 | |||
289 | /** | ||
290 | * Network type the address belongs to. | ||
291 | */ | ||
292 | enum GNUNET_NetworkType network_type; | ||
293 | |||
294 | /** | ||
295 | * Has the @e sender field been initialized yet? | ||
296 | */ | ||
297 | int have_sender; | ||
298 | }; | ||
299 | |||
300 | |||
301 | /** | ||
302 | * Context to send fragmented messages | ||
303 | */ | ||
304 | struct UDP_FragmentationContext | ||
305 | { | ||
306 | /** | ||
307 | * Next in linked list | ||
308 | */ | ||
309 | struct UDP_FragmentationContext *next; | ||
310 | |||
311 | /** | ||
312 | * Previous in linked list | ||
313 | */ | ||
314 | struct UDP_FragmentationContext *prev; | ||
315 | |||
316 | /** | ||
317 | * The plugin | ||
318 | */ | ||
319 | struct Plugin *plugin; | ||
320 | |||
321 | /** | ||
322 | * Handle for fragmentation. | ||
323 | */ | ||
324 | struct GNUNET_FRAGMENT_Context *frag; | ||
325 | |||
326 | /** | ||
327 | * The session this fragmentation context belongs to | ||
328 | */ | ||
329 | struct GNUNET_ATS_Session *session; | ||
330 | |||
331 | /** | ||
332 | * Function to call upon completion of the transmission. | ||
333 | */ | ||
334 | GNUNET_TRANSPORT_TransmitContinuation cont; | ||
335 | |||
336 | /** | ||
337 | * Closure for @e cont. | ||
338 | */ | ||
339 | void *cont_cls; | ||
340 | |||
341 | /** | ||
342 | * Start time. | ||
343 | */ | ||
344 | struct GNUNET_TIME_Absolute start_time; | ||
345 | |||
346 | /** | ||
347 | * Transmission time for the next fragment. Incremented by | ||
348 | * the @e flow_delay_from_other_peer for each fragment when | ||
349 | * we setup the fragments. | ||
350 | */ | ||
351 | struct GNUNET_TIME_Absolute next_frag_time; | ||
352 | |||
353 | /** | ||
354 | * Desired delay for transmissions we received from other peer. | ||
355 | * Adjusted to be per fragment (UDP_MTU), even though on the | ||
356 | * wire it was for "full messages". | ||
357 | */ | ||
358 | struct GNUNET_TIME_Relative flow_delay_from_other_peer; | ||
359 | |||
360 | /** | ||
361 | * Message timeout | ||
362 | */ | ||
363 | struct GNUNET_TIME_Absolute timeout; | ||
364 | |||
365 | /** | ||
366 | * Payload size of original unfragmented message | ||
367 | */ | ||
368 | size_t payload_size; | ||
369 | |||
370 | /** | ||
371 | * Bytes used to send all fragments on wire including UDP overhead | ||
372 | */ | ||
373 | size_t on_wire_size; | ||
374 | }; | ||
375 | |||
376 | |||
377 | /** | ||
378 | * Function called when a message is removed from the | ||
379 | * transmission queue. | ||
380 | * | ||
381 | * @param cls closure | ||
382 | * @param udpw message wrapper finished | ||
383 | * @param result #GNUNET_OK on success (message was sent) | ||
384 | * #GNUNET_SYSERR if the target disconnected | ||
385 | * or we had a timeout or other trouble sending | ||
386 | */ | ||
387 | typedef void (*QueueContinuation) (void *cls, | ||
388 | struct UDP_MessageWrapper *udpw, | ||
389 | int result); | ||
390 | |||
391 | |||
392 | /** | ||
393 | * Information we track for each message in the queue. | ||
394 | */ | ||
395 | struct UDP_MessageWrapper | ||
396 | { | ||
397 | /** | ||
398 | * Session this message belongs to | ||
399 | */ | ||
400 | struct GNUNET_ATS_Session *session; | ||
401 | |||
402 | /** | ||
403 | * DLL of messages, previous element | ||
404 | */ | ||
405 | struct UDP_MessageWrapper *prev; | ||
406 | |||
407 | /** | ||
408 | * DLL of messages, next element | ||
409 | */ | ||
410 | struct UDP_MessageWrapper *next; | ||
411 | |||
412 | /** | ||
413 | * Message with @e msg_size bytes including UDP-specific overhead. | ||
414 | */ | ||
415 | char *msg_buf; | ||
416 | |||
417 | /** | ||
418 | * Function to call once the message wrapper is being removed | ||
419 | * from the queue (with success or failure). | ||
420 | */ | ||
421 | QueueContinuation qc; | ||
422 | |||
423 | /** | ||
424 | * Closure for @e qc. | ||
425 | */ | ||
426 | void *qc_cls; | ||
427 | |||
428 | /** | ||
429 | * External continuation to call upon completion of the | ||
430 | * transmission, NULL if this queue entry is not for a | ||
431 | * message from the application. | ||
432 | */ | ||
433 | GNUNET_TRANSPORT_TransmitContinuation cont; | ||
434 | |||
435 | /** | ||
436 | * Closure for @e cont. | ||
437 | */ | ||
438 | void *cont_cls; | ||
439 | |||
440 | /** | ||
441 | * Fragmentation context. | ||
442 | * frag_ctx == NULL if transport <= MTU | ||
443 | * frag_ctx != NULL if transport > MTU | ||
444 | */ | ||
445 | struct UDP_FragmentationContext *frag_ctx; | ||
446 | |||
447 | /** | ||
448 | * Message enqueue time. | ||
449 | */ | ||
450 | struct GNUNET_TIME_Absolute start_time; | ||
451 | |||
452 | /** | ||
453 | * Desired transmission time for this message, based on the | ||
454 | * flow limiting information we got from the other peer. | ||
455 | */ | ||
456 | struct GNUNET_TIME_Absolute transmission_time; | ||
457 | |||
458 | /** | ||
459 | * Message timeout. | ||
460 | */ | ||
461 | struct GNUNET_TIME_Absolute timeout; | ||
462 | |||
463 | /** | ||
464 | * Size of UDP message to send, including UDP-specific overhead. | ||
465 | */ | ||
466 | size_t msg_size; | ||
467 | |||
468 | /** | ||
469 | * Payload size of original message. | ||
470 | */ | ||
471 | size_t payload_size; | ||
472 | }; | ||
473 | |||
474 | |||
475 | GNUNET_NETWORK_STRUCT_BEGIN | ||
476 | |||
477 | /** | ||
478 | * UDP ACK Message-Packet header. | ||
479 | */ | ||
480 | struct UDP_ACK_Message | ||
481 | { | ||
482 | /** | ||
483 | * Message header. | ||
484 | */ | ||
485 | struct GNUNET_MessageHeader header; | ||
486 | |||
487 | /** | ||
488 | * Desired delay for flow control, in us (in NBO). | ||
489 | * A value of UINT32_MAX indicates that the other | ||
490 | * peer wants us to disconnect. | ||
491 | */ | ||
492 | uint32_t delay GNUNET_PACKED; | ||
493 | |||
494 | /** | ||
495 | * What is the identity of the sender | ||
496 | */ | ||
497 | struct GNUNET_PeerIdentity sender; | ||
498 | }; | ||
499 | |||
500 | GNUNET_NETWORK_STRUCT_END | ||
501 | |||
502 | |||
503 | /* ************************* Monitoring *********** */ | ||
504 | |||
505 | |||
506 | /** | ||
507 | * If a session monitor is attached, notify it about the new | ||
508 | * session state. | ||
509 | * | ||
510 | * @param plugin our plugin | ||
511 | * @param session session that changed state | ||
512 | * @param state new state of the session | ||
513 | */ | ||
514 | static void | ||
515 | notify_session_monitor (struct Plugin *plugin, | ||
516 | struct GNUNET_ATS_Session *session, | ||
517 | enum GNUNET_TRANSPORT_SessionState state) | ||
518 | { | ||
519 | struct GNUNET_TRANSPORT_SessionInfo info; | ||
520 | |||
521 | if (NULL == plugin->sic) | ||
522 | return; | ||
523 | if (GNUNET_YES == session->in_destroy) | ||
524 | return; /* already destroyed, just RC>0 left-over actions */ | ||
525 | memset (&info, 0, sizeof(info)); | ||
526 | info.state = state; | ||
527 | info.is_inbound = GNUNET_SYSERR; /* hard to say */ | ||
528 | info.num_msg_pending = session->msgs_in_queue; | ||
529 | info.num_bytes_pending = session->bytes_in_queue; | ||
530 | /* info.receive_delay remains zero as this is not supported by UDP | ||
531 | (cannot selectively not receive from 'some' peer while continuing | ||
532 | to receive from others) */ | ||
533 | info.session_timeout = session->timeout; | ||
534 | info.address = session->address; | ||
535 | plugin->sic (plugin->sic_cls, session, &info); | ||
536 | } | ||
537 | |||
538 | |||
539 | /** | ||
540 | * Return information about the given session to the monitor callback. | ||
541 | * | ||
542 | * @param cls the `struct Plugin` with the monitor callback (`sic`) | ||
543 | * @param peer peer we send information about | ||
544 | * @param value our `struct GNUNET_ATS_Session` to send information about | ||
545 | * @return #GNUNET_OK (continue to iterate) | ||
546 | */ | ||
547 | static int | ||
548 | send_session_info_iter (void *cls, | ||
549 | const struct GNUNET_PeerIdentity *peer, | ||
550 | void *value) | ||
551 | { | ||
552 | struct Plugin *plugin = cls; | ||
553 | struct GNUNET_ATS_Session *session = value; | ||
554 | |||
555 | notify_session_monitor (plugin, session, GNUNET_TRANSPORT_SS_INIT); | ||
556 | notify_session_monitor (plugin, session, GNUNET_TRANSPORT_SS_UP); | ||
557 | return GNUNET_OK; | ||
558 | } | ||
559 | |||
560 | |||
561 | /** | ||
562 | * Begin monitoring sessions of a plugin. There can only | ||
563 | * be one active monitor per plugin (i.e. if there are | ||
564 | * multiple monitors, the transport service needs to | ||
565 | * multiplex the generated events over all of them). | ||
566 | * | ||
567 | * @param cls closure of the plugin | ||
568 | * @param sic callback to invoke, NULL to disable monitor; | ||
569 | * plugin will being by iterating over all active | ||
570 | * sessions immediately and then enter monitor mode | ||
571 | * @param sic_cls closure for @a sic | ||
572 | */ | ||
573 | static void | ||
574 | udp_plugin_setup_monitor (void *cls, | ||
575 | GNUNET_TRANSPORT_SessionInfoCallback sic, | ||
576 | void *sic_cls) | ||
577 | { | ||
578 | struct Plugin *plugin = cls; | ||
579 | |||
580 | plugin->sic = sic; | ||
581 | plugin->sic_cls = sic_cls; | ||
582 | if (NULL != sic) | ||
583 | { | ||
584 | GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions, | ||
585 | &send_session_info_iter, | ||
586 | plugin); | ||
587 | /* signal end of first iteration */ | ||
588 | sic (sic_cls, NULL, NULL); | ||
589 | } | ||
590 | } | ||
591 | |||
592 | |||
593 | /* ****************** Little Helpers ****************** */ | ||
594 | |||
595 | |||
596 | /** | ||
597 | * Function to free last resources associated with a session. | ||
598 | * | ||
599 | * @param s session to free | ||
600 | */ | ||
601 | static void | ||
602 | free_session (struct GNUNET_ATS_Session *s) | ||
603 | { | ||
604 | if (NULL != s->address) | ||
605 | { | ||
606 | GNUNET_HELLO_address_free (s->address); | ||
607 | s->address = NULL; | ||
608 | } | ||
609 | if (NULL != s->frag_ctx) | ||
610 | { | ||
611 | GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag, NULL, NULL); | ||
612 | GNUNET_free (s->frag_ctx); | ||
613 | s->frag_ctx = NULL; | ||
614 | } | ||
615 | if (NULL != s->mst) | ||
616 | { | ||
617 | GNUNET_MST_destroy (s->mst); | ||
618 | s->mst = NULL; | ||
619 | } | ||
620 | GNUNET_free (s); | ||
621 | } | ||
622 | |||
623 | |||
624 | /** | ||
625 | * Function that is called to get the keepalive factor. | ||
626 | * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to | ||
627 | * calculate the interval between keepalive packets. | ||
628 | * | ||
629 | * @param cls closure with the `struct Plugin` | ||
630 | * @return keepalive factor | ||
631 | */ | ||
632 | static unsigned int | ||
633 | udp_query_keepalive_factor (void *cls) | ||
634 | { | ||
635 | return 15; | ||
636 | } | ||
637 | |||
638 | |||
639 | /** | ||
640 | * Function obtain the network type for a session | ||
641 | * | ||
642 | * @param cls closure (`struct Plugin *`) | ||
643 | * @param session the session | ||
644 | * @return the network type | ||
645 | */ | ||
646 | static enum GNUNET_NetworkType | ||
647 | udp_plugin_get_network (void *cls, struct GNUNET_ATS_Session *session) | ||
648 | { | ||
649 | return session->scope; | ||
650 | } | ||
651 | |||
652 | |||
653 | /** | ||
654 | * Function obtain the network type for an address. | ||
655 | * | ||
656 | * @param cls closure (`struct Plugin *`) | ||
657 | * @param address the address | ||
658 | * @return the network type | ||
659 | */ | ||
660 | static enum GNUNET_NetworkType | ||
661 | udp_plugin_get_network_for_address (void *cls, | ||
662 | const struct GNUNET_HELLO_Address *address) | ||
663 | { | ||
664 | struct Plugin *plugin = cls; | ||
665 | size_t addrlen; | ||
666 | struct sockaddr_in a4; | ||
667 | struct sockaddr_in6 a6; | ||
668 | const struct IPv4UdpAddress *u4; | ||
669 | const struct IPv6UdpAddress *u6; | ||
670 | const void *sb; | ||
671 | size_t sbs; | ||
672 | |||
673 | addrlen = address->address_length; | ||
674 | if (addrlen == sizeof(struct IPv6UdpAddress)) | ||
675 | { | ||
676 | GNUNET_assert (NULL != address->address); /* make static analysis happy */ | ||
677 | u6 = address->address; | ||
678 | memset (&a6, 0, sizeof(a6)); | ||
679 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
680 | a6.sin6_len = sizeof(a6); | ||
681 | #endif | ||
682 | a6.sin6_family = AF_INET6; | ||
683 | a6.sin6_port = u6->u6_port; | ||
684 | GNUNET_memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr)); | ||
685 | sb = &a6; | ||
686 | sbs = sizeof(a6); | ||
687 | } | ||
688 | else if (addrlen == sizeof(struct IPv4UdpAddress)) | ||
689 | { | ||
690 | GNUNET_assert (NULL != address->address); /* make static analysis happy */ | ||
691 | u4 = address->address; | ||
692 | memset (&a4, 0, sizeof(a4)); | ||
693 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
694 | a4.sin_len = sizeof(a4); | ||
695 | #endif | ||
696 | a4.sin_family = AF_INET; | ||
697 | a4.sin_port = u4->u4_port; | ||
698 | a4.sin_addr.s_addr = u4->ipv4_addr; | ||
699 | sb = &a4; | ||
700 | sbs = sizeof(a4); | ||
701 | } | ||
702 | else | ||
703 | { | ||
704 | GNUNET_break (0); | ||
705 | return GNUNET_NT_UNSPECIFIED; | ||
706 | } | ||
707 | return plugin->env->get_address_type (plugin->env->cls, sb, sbs); | ||
708 | } | ||
709 | |||
710 | |||
711 | /* ******************* Event loop ******************** */ | ||
712 | |||
713 | /** | ||
714 | * We have been notified that our readset has something to read. We don't | ||
715 | * know which socket needs to be read, so we have to check each one | ||
716 | * Then reschedule this function to be called again once more is available. | ||
717 | * | ||
718 | * @param cls the plugin handle | ||
719 | */ | ||
720 | static void | ||
721 | udp_plugin_select_v4 (void *cls); | ||
722 | |||
723 | |||
724 | /** | ||
725 | * We have been notified that our readset has something to read. We don't | ||
726 | * know which socket needs to be read, so we have to check each one | ||
727 | * Then reschedule this function to be called again once more is available. | ||
728 | * | ||
729 | * @param cls the plugin handle | ||
730 | */ | ||
731 | static void | ||
732 | udp_plugin_select_v6 (void *cls); | ||
733 | |||
734 | |||
735 | /** | ||
736 | * (re)schedule IPv4-select tasks for this plugin. | ||
737 | * | ||
738 | * @param plugin plugin to reschedule | ||
739 | */ | ||
740 | static void | ||
741 | schedule_select_v4 (struct Plugin *plugin) | ||
742 | { | ||
743 | struct GNUNET_TIME_Relative min_delay; | ||
744 | struct GNUNET_TIME_Relative delay; | ||
745 | struct UDP_MessageWrapper *udpw; | ||
746 | struct UDP_MessageWrapper *min_udpw; | ||
747 | |||
748 | if ((GNUNET_YES == plugin->enable_ipv4) && (NULL != plugin->sockv4)) | ||
749 | { | ||
750 | /* Find a message ready to send: | ||
751 | * Flow delay from other peer is expired or not set (0) */ | ||
752 | min_delay = GNUNET_TIME_UNIT_FOREVER_REL; | ||
753 | min_udpw = NULL; | ||
754 | for (udpw = plugin->ipv4_queue_head; NULL != udpw; udpw = udpw->next) | ||
755 | { | ||
756 | delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time); | ||
757 | if (delay.rel_value_us < min_delay.rel_value_us) | ||
758 | { | ||
759 | min_delay = delay; | ||
760 | min_udpw = udpw; | ||
761 | } | ||
762 | } | ||
763 | if (NULL != plugin->select_task_v4) | ||
764 | GNUNET_SCHEDULER_cancel (plugin->select_task_v4); | ||
765 | if (NULL != min_udpw) | ||
766 | { | ||
767 | if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
768 | { | ||
769 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
770 | "Calculated flow delay for UDPv4 at %s for %s\n", | ||
771 | GNUNET_STRINGS_relative_time_to_string (min_delay, | ||
772 | GNUNET_YES), | ||
773 | GNUNET_i2s (&min_udpw->session->target)); | ||
774 | } | ||
775 | else | ||
776 | { | ||
777 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
778 | "Calculated flow delay for UDPv4 at %s for %s\n", | ||
779 | GNUNET_STRINGS_relative_time_to_string (min_delay, | ||
780 | GNUNET_YES), | ||
781 | GNUNET_i2s (&min_udpw->session->target)); | ||
782 | } | ||
783 | } | ||
784 | plugin->select_task_v4 = | ||
785 | GNUNET_SCHEDULER_add_read_net (min_delay, | ||
786 | plugin->sockv4, | ||
787 | &udp_plugin_select_v4, | ||
788 | plugin); | ||
789 | } | ||
790 | } | ||
791 | |||
792 | |||
793 | /** | ||
794 | * (re)schedule IPv6-select tasks for this plugin. | ||
795 | * | ||
796 | * @param plugin plugin to reschedule | ||
797 | */ | ||
798 | static void | ||
799 | schedule_select_v6 (struct Plugin *plugin) | ||
800 | { | ||
801 | struct GNUNET_TIME_Relative min_delay; | ||
802 | struct GNUNET_TIME_Relative delay; | ||
803 | struct UDP_MessageWrapper *udpw; | ||
804 | struct UDP_MessageWrapper *min_udpw; | ||
805 | |||
806 | if ((GNUNET_YES == plugin->enable_ipv6) && (NULL != plugin->sockv6)) | ||
807 | { | ||
808 | min_delay = GNUNET_TIME_UNIT_FOREVER_REL; | ||
809 | min_udpw = NULL; | ||
810 | for (udpw = plugin->ipv6_queue_head; NULL != udpw; udpw = udpw->next) | ||
811 | { | ||
812 | delay = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time); | ||
813 | if (delay.rel_value_us < min_delay.rel_value_us) | ||
814 | { | ||
815 | min_delay = delay; | ||
816 | min_udpw = udpw; | ||
817 | } | ||
818 | } | ||
819 | if (NULL != plugin->select_task_v6) | ||
820 | GNUNET_SCHEDULER_cancel (plugin->select_task_v6); | ||
821 | if (NULL != min_udpw) | ||
822 | { | ||
823 | if (min_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
824 | { | ||
825 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
826 | "Calculated flow delay for UDPv6 at %s for %s\n", | ||
827 | GNUNET_STRINGS_relative_time_to_string (min_delay, | ||
828 | GNUNET_YES), | ||
829 | GNUNET_i2s (&min_udpw->session->target)); | ||
830 | } | ||
831 | else | ||
832 | { | ||
833 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
834 | "Calculated flow delay for UDPv6 at %s for %s\n", | ||
835 | GNUNET_STRINGS_relative_time_to_string (min_delay, | ||
836 | GNUNET_YES), | ||
837 | GNUNET_i2s (&min_udpw->session->target)); | ||
838 | } | ||
839 | } | ||
840 | plugin->select_task_v6 = | ||
841 | GNUNET_SCHEDULER_add_read_net (min_delay, | ||
842 | plugin->sockv6, | ||
843 | &udp_plugin_select_v6, | ||
844 | plugin); | ||
845 | } | ||
846 | } | ||
847 | |||
848 | |||
849 | /* ******************* Address to string and back ***************** */ | ||
850 | |||
851 | |||
852 | /** | ||
853 | * Function called for a quick conversion of the binary address to | ||
854 | * a numeric address. Note that the caller must not free the | ||
855 | * address and that the next call to this function is allowed | ||
856 | * to override the address again. | ||
857 | * | ||
858 | * @param cls closure | ||
859 | * @param addr binary address (a `union UdpAddress`) | ||
860 | * @param addrlen length of the @a addr | ||
861 | * @return string representing the same address | ||
862 | */ | ||
863 | const char * | ||
864 | udp_address_to_string (void *cls, const void *addr, size_t addrlen) | ||
865 | { | ||
866 | static char rbuf[INET6_ADDRSTRLEN + 10]; | ||
867 | char buf[INET6_ADDRSTRLEN]; | ||
868 | const void *sb; | ||
869 | struct in_addr a4; | ||
870 | struct in6_addr a6; | ||
871 | const struct IPv4UdpAddress *t4; | ||
872 | const struct IPv6UdpAddress *t6; | ||
873 | int af; | ||
874 | uint16_t port; | ||
875 | uint32_t options; | ||
876 | |||
877 | if (NULL == addr) | ||
878 | { | ||
879 | GNUNET_break_op (0); | ||
880 | return NULL; | ||
881 | } | ||
882 | |||
883 | if (addrlen == sizeof(struct IPv6UdpAddress)) | ||
884 | { | ||
885 | t6 = addr; | ||
886 | af = AF_INET6; | ||
887 | options = ntohl (t6->options); | ||
888 | port = ntohs (t6->u6_port); | ||
889 | a6 = t6->ipv6_addr; | ||
890 | sb = &a6; | ||
891 | } | ||
892 | else if (addrlen == sizeof(struct IPv4UdpAddress)) | ||
893 | { | ||
894 | t4 = addr; | ||
895 | af = AF_INET; | ||
896 | options = ntohl (t4->options); | ||
897 | port = ntohs (t4->u4_port); | ||
898 | a4.s_addr = t4->ipv4_addr; | ||
899 | sb = &a4; | ||
900 | } | ||
901 | else | ||
902 | { | ||
903 | GNUNET_break_op (0); | ||
904 | return NULL; | ||
905 | } | ||
906 | inet_ntop (af, sb, buf, INET6_ADDRSTRLEN); | ||
907 | GNUNET_snprintf (rbuf, | ||
908 | sizeof(rbuf), | ||
909 | (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u", | ||
910 | PLUGIN_NAME, | ||
911 | options, | ||
912 | buf, | ||
913 | port); | ||
914 | return rbuf; | ||
915 | } | ||
916 | |||
917 | |||
918 | /** | ||
919 | * Function called to convert a string address to a binary address. | ||
920 | * | ||
921 | * @param cls closure (`struct Plugin *`) | ||
922 | * @param addr string address | ||
923 | * @param addrlen length of the address | ||
924 | * @param buf location to store the buffer | ||
925 | * @param added location to store the number of bytes in the buffer. | ||
926 | * If the function returns #GNUNET_SYSERR, its contents are undefined. | ||
927 | * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure | ||
928 | */ | ||
929 | static int | ||
930 | udp_string_to_address (void *cls, | ||
931 | const char *addr, | ||
932 | uint16_t addrlen, | ||
933 | void **buf, | ||
934 | size_t *added) | ||
935 | { | ||
936 | struct sockaddr_storage socket_address; | ||
937 | char *address; | ||
938 | char *plugin; | ||
939 | char *optionstr; | ||
940 | uint32_t options; | ||
941 | |||
942 | /* Format tcp.options.address:port */ | ||
943 | address = NULL; | ||
944 | plugin = NULL; | ||
945 | optionstr = NULL; | ||
946 | |||
947 | if ((NULL == addr) || (0 == addrlen)) | ||
948 | { | ||
949 | GNUNET_break (0); | ||
950 | return GNUNET_SYSERR; | ||
951 | } | ||
952 | if ('\0' != addr[addrlen - 1]) | ||
953 | { | ||
954 | GNUNET_break (0); | ||
955 | return GNUNET_SYSERR; | ||
956 | } | ||
957 | if (strlen (addr) != addrlen - 1) | ||
958 | { | ||
959 | GNUNET_break (0); | ||
960 | return GNUNET_SYSERR; | ||
961 | } | ||
962 | plugin = GNUNET_strdup (addr); | ||
963 | optionstr = strchr (plugin, '.'); | ||
964 | if (NULL == optionstr) | ||
965 | { | ||
966 | GNUNET_break (0); | ||
967 | GNUNET_free (plugin); | ||
968 | return GNUNET_SYSERR; | ||
969 | } | ||
970 | optionstr[0] = '\0'; | ||
971 | optionstr++; | ||
972 | options = atol (optionstr); | ||
973 | address = strchr (optionstr, '.'); | ||
974 | if (NULL == address) | ||
975 | { | ||
976 | GNUNET_break (0); | ||
977 | GNUNET_free (plugin); | ||
978 | return GNUNET_SYSERR; | ||
979 | } | ||
980 | address[0] = '\0'; | ||
981 | address++; | ||
982 | |||
983 | if (GNUNET_OK != | ||
984 | GNUNET_STRINGS_to_address_ip (address, strlen (address), &socket_address)) | ||
985 | { | ||
986 | GNUNET_break (0); | ||
987 | GNUNET_free (plugin); | ||
988 | return GNUNET_SYSERR; | ||
989 | } | ||
990 | GNUNET_free (plugin); | ||
991 | |||
992 | switch (socket_address.ss_family) | ||
993 | { | ||
994 | case AF_INET: { | ||
995 | struct IPv4UdpAddress *u4; | ||
996 | const struct sockaddr_in *in4 = | ||
997 | (const struct sockaddr_in *) &socket_address; | ||
998 | |||
999 | u4 = GNUNET_new (struct IPv4UdpAddress); | ||
1000 | u4->options = htonl (options); | ||
1001 | u4->ipv4_addr = in4->sin_addr.s_addr; | ||
1002 | u4->u4_port = in4->sin_port; | ||
1003 | *buf = u4; | ||
1004 | *added = sizeof(struct IPv4UdpAddress); | ||
1005 | return GNUNET_OK; | ||
1006 | } | ||
1007 | |||
1008 | case AF_INET6: { | ||
1009 | struct IPv6UdpAddress *u6; | ||
1010 | const struct sockaddr_in6 *in6 = | ||
1011 | (const struct sockaddr_in6 *) &socket_address; | ||
1012 | |||
1013 | u6 = GNUNET_new (struct IPv6UdpAddress); | ||
1014 | u6->options = htonl (options); | ||
1015 | u6->ipv6_addr = in6->sin6_addr; | ||
1016 | u6->u6_port = in6->sin6_port; | ||
1017 | *buf = u6; | ||
1018 | *added = sizeof(struct IPv6UdpAddress); | ||
1019 | return GNUNET_OK; | ||
1020 | } | ||
1021 | |||
1022 | default: | ||
1023 | GNUNET_break (0); | ||
1024 | return GNUNET_SYSERR; | ||
1025 | } | ||
1026 | } | ||
1027 | |||
1028 | |||
1029 | /** | ||
1030 | * Append our port and forward the result. | ||
1031 | * | ||
1032 | * @param cls a `struct PrettyPrinterContext *` | ||
1033 | * @param hostname result from DNS resolver | ||
1034 | */ | ||
1035 | static void | ||
1036 | append_port (void *cls, const char *hostname) | ||
1037 | { | ||
1038 | struct PrettyPrinterContext *ppc = cls; | ||
1039 | struct Plugin *plugin = ppc->plugin; | ||
1040 | char *ret; | ||
1041 | |||
1042 | if (NULL == hostname) | ||
1043 | { | ||
1044 | /* Final call, done */ | ||
1045 | GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head, | ||
1046 | plugin->ppc_dll_tail, | ||
1047 | ppc); | ||
1048 | ppc->resolver_handle = NULL; | ||
1049 | ppc->asc (ppc->asc_cls, NULL, GNUNET_OK); | ||
1050 | GNUNET_free (ppc); | ||
1051 | return; | ||
1052 | } | ||
1053 | if (GNUNET_YES == ppc->ipv6) | ||
1054 | GNUNET_asprintf (&ret, | ||
1055 | "%s.%u.[%s]:%d", | ||
1056 | PLUGIN_NAME, | ||
1057 | ppc->options, | ||
1058 | hostname, | ||
1059 | ppc->port); | ||
1060 | else | ||
1061 | GNUNET_asprintf (&ret, | ||
1062 | "%s.%u.%s:%d", | ||
1063 | PLUGIN_NAME, | ||
1064 | ppc->options, | ||
1065 | hostname, | ||
1066 | ppc->port); | ||
1067 | ppc->asc (ppc->asc_cls, ret, GNUNET_OK); | ||
1068 | GNUNET_free (ret); | ||
1069 | } | ||
1070 | |||
1071 | |||
1072 | /** | ||
1073 | * Convert the transports address to a nice, human-readable format. | ||
1074 | * | ||
1075 | * @param cls closure with the `struct Plugin *` | ||
1076 | * @param type name of the transport that generated the address | ||
1077 | * @param addr one of the addresses of the host, NULL for the last address | ||
1078 | * the specific address format depends on the transport; | ||
1079 | * a `union UdpAddress` | ||
1080 | * @param addrlen length of the address | ||
1081 | * @param numeric should (IP) addresses be displayed in numeric form? | ||
1082 | * @param timeout after how long should we give up? | ||
1083 | * @param asc function to call on each string | ||
1084 | * @param asc_cls closure for @a asc | ||
1085 | */ | ||
1086 | static void | ||
1087 | udp_plugin_address_pretty_printer (void *cls, | ||
1088 | const char *type, | ||
1089 | const void *addr, | ||
1090 | size_t addrlen, | ||
1091 | int numeric, | ||
1092 | struct GNUNET_TIME_Relative timeout, | ||
1093 | GNUNET_TRANSPORT_AddressStringCallback asc, | ||
1094 | void *asc_cls) | ||
1095 | { | ||
1096 | struct Plugin *plugin = cls; | ||
1097 | struct PrettyPrinterContext *ppc; | ||
1098 | const struct sockaddr *sb; | ||
1099 | size_t sbs; | ||
1100 | struct sockaddr_in a4; | ||
1101 | struct sockaddr_in6 a6; | ||
1102 | const struct IPv4UdpAddress *u4; | ||
1103 | const struct IPv6UdpAddress *u6; | ||
1104 | uint16_t port; | ||
1105 | uint32_t options; | ||
1106 | |||
1107 | if (addrlen == sizeof(struct IPv6UdpAddress)) | ||
1108 | { | ||
1109 | u6 = addr; | ||
1110 | memset (&a6, 0, sizeof(a6)); | ||
1111 | a6.sin6_family = AF_INET6; | ||
1112 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1113 | a6.sin6_len = sizeof(a6); | ||
1114 | #endif | ||
1115 | a6.sin6_port = u6->u6_port; | ||
1116 | a6.sin6_addr = u6->ipv6_addr; | ||
1117 | port = ntohs (u6->u6_port); | ||
1118 | options = ntohl (u6->options); | ||
1119 | sb = (const struct sockaddr *) &a6; | ||
1120 | sbs = sizeof(a6); | ||
1121 | } | ||
1122 | else if (addrlen == sizeof(struct IPv4UdpAddress)) | ||
1123 | { | ||
1124 | u4 = addr; | ||
1125 | memset (&a4, 0, sizeof(a4)); | ||
1126 | a4.sin_family = AF_INET; | ||
1127 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1128 | a4.sin_len = sizeof(a4); | ||
1129 | #endif | ||
1130 | a4.sin_port = u4->u4_port; | ||
1131 | a4.sin_addr.s_addr = u4->ipv4_addr; | ||
1132 | port = ntohs (u4->u4_port); | ||
1133 | options = ntohl (u4->options); | ||
1134 | sb = (const struct sockaddr *) &a4; | ||
1135 | sbs = sizeof(a4); | ||
1136 | } | ||
1137 | else | ||
1138 | { | ||
1139 | /* invalid address */ | ||
1140 | GNUNET_break_op (0); | ||
1141 | asc (asc_cls, NULL, GNUNET_SYSERR); | ||
1142 | asc (asc_cls, NULL, GNUNET_OK); | ||
1143 | return; | ||
1144 | } | ||
1145 | ppc = GNUNET_new (struct PrettyPrinterContext); | ||
1146 | ppc->plugin = plugin; | ||
1147 | ppc->asc = asc; | ||
1148 | ppc->asc_cls = asc_cls; | ||
1149 | ppc->port = port; | ||
1150 | ppc->options = options; | ||
1151 | if (addrlen == sizeof(struct IPv6UdpAddress)) | ||
1152 | ppc->ipv6 = GNUNET_YES; | ||
1153 | else | ||
1154 | ppc->ipv6 = GNUNET_NO; | ||
1155 | GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head, plugin->ppc_dll_tail, ppc); | ||
1156 | ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, | ||
1157 | sbs, | ||
1158 | ! numeric, | ||
1159 | timeout, | ||
1160 | &append_port, | ||
1161 | ppc); | ||
1162 | } | ||
1163 | |||
1164 | |||
1165 | /** | ||
1166 | * Check if the given port is plausible (must be either our listen | ||
1167 | * port or our advertised port). If it is neither, we return | ||
1168 | * #GNUNET_SYSERR. | ||
1169 | * | ||
1170 | * @param plugin global variables | ||
1171 | * @param in_port port number to check | ||
1172 | * @return #GNUNET_OK if port is either our open or advertised port | ||
1173 | */ | ||
1174 | static int | ||
1175 | check_port (const struct Plugin *plugin, uint16_t in_port) | ||
1176 | { | ||
1177 | if ((plugin->port == in_port) || (plugin->aport == in_port)) | ||
1178 | return GNUNET_OK; | ||
1179 | return GNUNET_SYSERR; | ||
1180 | } | ||
1181 | |||
1182 | |||
1183 | /** | ||
1184 | * Function that will be called to check if a binary address for this | ||
1185 | * plugin is well-formed and corresponds to an address for THIS peer | ||
1186 | * (as per our configuration). Naturally, if absolutely necessary, | ||
1187 | * plugins can be a bit conservative in their answer, but in general | ||
1188 | * plugins should make sure that the address does not redirect | ||
1189 | * traffic to a 3rd party that might try to man-in-the-middle our | ||
1190 | * traffic. | ||
1191 | * | ||
1192 | * @param cls closure, should be our handle to the Plugin | ||
1193 | * @param addr pointer to a `union UdpAddress` | ||
1194 | * @param addrlen length of @a addr | ||
1195 | * @return #GNUNET_OK if this is a plausible address for this peer | ||
1196 | * and transport, #GNUNET_SYSERR if not | ||
1197 | */ | ||
1198 | static int | ||
1199 | udp_plugin_check_address (void *cls, const void *addr, size_t addrlen) | ||
1200 | { | ||
1201 | struct Plugin *plugin = cls; | ||
1202 | const struct IPv4UdpAddress *v4; | ||
1203 | const struct IPv6UdpAddress *v6; | ||
1204 | |||
1205 | if (sizeof(struct IPv4UdpAddress) == addrlen) | ||
1206 | { | ||
1207 | struct sockaddr_in s4; | ||
1208 | |||
1209 | v4 = (const struct IPv4UdpAddress *) addr; | ||
1210 | if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port))) | ||
1211 | return GNUNET_SYSERR; | ||
1212 | memset (&s4, 0, sizeof(s4)); | ||
1213 | s4.sin_family = AF_INET; | ||
1214 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1215 | s4.sin_len = sizeof(s4); | ||
1216 | #endif | ||
1217 | s4.sin_port = v4->u4_port; | ||
1218 | s4.sin_addr.s_addr = v4->ipv4_addr; | ||
1219 | |||
1220 | if (GNUNET_OK != | ||
1221 | GNUNET_NAT_test_address (plugin->nat, &s4, sizeof(struct sockaddr_in))) | ||
1222 | return GNUNET_SYSERR; | ||
1223 | } | ||
1224 | else if (sizeof(struct IPv6UdpAddress) == addrlen) | ||
1225 | { | ||
1226 | struct sockaddr_in6 s6; | ||
1227 | |||
1228 | v6 = (const struct IPv6UdpAddress *) addr; | ||
1229 | if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr)) | ||
1230 | return GNUNET_OK; /* plausible, if unlikely... */ | ||
1231 | memset (&s6, 0, sizeof(s6)); | ||
1232 | s6.sin6_family = AF_INET6; | ||
1233 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1234 | s6.sin6_len = sizeof(s6); | ||
1235 | #endif | ||
1236 | s6.sin6_port = v6->u6_port; | ||
1237 | s6.sin6_addr = v6->ipv6_addr; | ||
1238 | |||
1239 | if (GNUNET_OK != GNUNET_NAT_test_address (plugin->nat, | ||
1240 | &s6, | ||
1241 | sizeof(struct sockaddr_in6))) | ||
1242 | return GNUNET_SYSERR; | ||
1243 | } | ||
1244 | else | ||
1245 | { | ||
1246 | GNUNET_break_op (0); | ||
1247 | return GNUNET_SYSERR; | ||
1248 | } | ||
1249 | return GNUNET_OK; | ||
1250 | } | ||
1251 | |||
1252 | |||
1253 | /** | ||
1254 | * Our external IP address/port mapping has changed. | ||
1255 | * | ||
1256 | * @param cls closure, the `struct Plugin` | ||
1257 | * @param app_ctx[in,out] location where the app can store stuff | ||
1258 | * on add and retrieve it on remove | ||
1259 | * @param add_remove #GNUNET_YES to mean the new public IP address, | ||
1260 | * #GNUNET_NO to mean the previous (now invalid) one | ||
1261 | * @param ac address class the address belongs to | ||
1262 | * @param addr either the previous or the new public IP address | ||
1263 | * @param addrlen actual length of the @a addr | ||
1264 | */ | ||
1265 | static void | ||
1266 | udp_nat_port_map_callback (void *cls, | ||
1267 | void **app_ctx, | ||
1268 | int add_remove, | ||
1269 | enum GNUNET_NAT_AddressClass ac, | ||
1270 | const struct sockaddr *addr, | ||
1271 | socklen_t addrlen) | ||
1272 | { | ||
1273 | struct Plugin *plugin = cls; | ||
1274 | struct GNUNET_HELLO_Address *address; | ||
1275 | struct IPv4UdpAddress u4; | ||
1276 | struct IPv6UdpAddress u6; | ||
1277 | void *arg; | ||
1278 | size_t args; | ||
1279 | |||
1280 | (void) app_ctx; | ||
1281 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1282 | (GNUNET_YES == add_remove) ? "NAT notification to add address `%s'\n" | ||
1283 | : "NAT notification to remove address `%s'\n", | ||
1284 | GNUNET_a2s (addr, addrlen)); | ||
1285 | /* convert 'address' to our internal format */ | ||
1286 | switch (addr->sa_family) | ||
1287 | { | ||
1288 | case AF_INET: { | ||
1289 | const struct sockaddr_in *i4; | ||
1290 | |||
1291 | GNUNET_assert (sizeof(struct sockaddr_in) == addrlen); | ||
1292 | i4 = (const struct sockaddr_in *) addr; | ||
1293 | if (0 == ntohs (i4->sin_port)) | ||
1294 | return; /* Port = 0 means unmapped, ignore these for UDP. */ | ||
1295 | memset (&u4, 0, sizeof(u4)); | ||
1296 | u4.options = htonl (plugin->myoptions); | ||
1297 | u4.ipv4_addr = i4->sin_addr.s_addr; | ||
1298 | u4.u4_port = i4->sin_port; | ||
1299 | arg = &u4; | ||
1300 | args = sizeof(struct IPv4UdpAddress); | ||
1301 | break; | ||
1302 | } | ||
1303 | |||
1304 | case AF_INET6: { | ||
1305 | const struct sockaddr_in6 *i6; | ||
1306 | |||
1307 | GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen); | ||
1308 | i6 = (const struct sockaddr_in6 *) addr; | ||
1309 | if (0 == ntohs (i6->sin6_port)) | ||
1310 | return; /* Port = 0 means unmapped, ignore these for UDP. */ | ||
1311 | memset (&u6, 0, sizeof(u6)); | ||
1312 | u6.options = htonl (plugin->myoptions); | ||
1313 | u6.ipv6_addr = i6->sin6_addr; | ||
1314 | u6.u6_port = i6->sin6_port; | ||
1315 | arg = &u6; | ||
1316 | args = sizeof(struct IPv6UdpAddress); | ||
1317 | break; | ||
1318 | } | ||
1319 | |||
1320 | default: | ||
1321 | GNUNET_break (0); | ||
1322 | return; | ||
1323 | } | ||
1324 | /* modify our published address list */ | ||
1325 | /* TODO: use 'ac' here in the future... */ | ||
1326 | address = GNUNET_HELLO_address_allocate (plugin->env->my_identity, | ||
1327 | PLUGIN_NAME, | ||
1328 | arg, | ||
1329 | args, | ||
1330 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
1331 | plugin->env->notify_address (plugin->env->cls, add_remove, address); | ||
1332 | GNUNET_HELLO_address_free (address); | ||
1333 | } | ||
1334 | |||
1335 | |||
1336 | /* ********************* Finding sessions ******************* */ | ||
1337 | |||
1338 | |||
1339 | /** | ||
1340 | * Closure for #session_cmp_it(). | ||
1341 | */ | ||
1342 | struct GNUNET_ATS_SessionCompareContext | ||
1343 | { | ||
1344 | /** | ||
1345 | * Set to session matching the address. | ||
1346 | */ | ||
1347 | struct GNUNET_ATS_Session *res; | ||
1348 | |||
1349 | /** | ||
1350 | * Address we are looking for. | ||
1351 | */ | ||
1352 | const struct GNUNET_HELLO_Address *address; | ||
1353 | }; | ||
1354 | |||
1355 | |||
1356 | /** | ||
1357 | * Find a session with a matching address. | ||
1358 | * | ||
1359 | * @param cls the `struct GNUNET_ATS_SessionCompareContext *` | ||
1360 | * @param key peer identity (unused) | ||
1361 | * @param value the `struct GNUNET_ATS_Session *` | ||
1362 | * @return #GNUNET_NO if we found the session, #GNUNET_OK if not | ||
1363 | */ | ||
1364 | static int | ||
1365 | session_cmp_it (void *cls, const struct GNUNET_PeerIdentity *key, void *value) | ||
1366 | { | ||
1367 | struct GNUNET_ATS_SessionCompareContext *cctx = cls; | ||
1368 | struct GNUNET_ATS_Session *s = value; | ||
1369 | |||
1370 | if (0 == GNUNET_HELLO_address_cmp (s->address, cctx->address)) | ||
1371 | { | ||
1372 | GNUNET_assert (GNUNET_NO == s->in_destroy); | ||
1373 | cctx->res = s; | ||
1374 | return GNUNET_NO; | ||
1375 | } | ||
1376 | return GNUNET_OK; | ||
1377 | } | ||
1378 | |||
1379 | |||
1380 | /** | ||
1381 | * Locate an existing session the transport service is using to | ||
1382 | * send data to another peer. Performs some basic sanity checks | ||
1383 | * on the address and then tries to locate a matching session. | ||
1384 | * | ||
1385 | * @param cls the plugin | ||
1386 | * @param address the address we should locate the session by | ||
1387 | * @return the session if it exists, or NULL if it is not found | ||
1388 | */ | ||
1389 | static struct GNUNET_ATS_Session * | ||
1390 | udp_plugin_lookup_session (void *cls, | ||
1391 | const struct GNUNET_HELLO_Address *address) | ||
1392 | { | ||
1393 | struct Plugin *plugin = cls; | ||
1394 | const struct IPv6UdpAddress *udp_a6; | ||
1395 | const struct IPv4UdpAddress *udp_a4; | ||
1396 | struct GNUNET_ATS_SessionCompareContext cctx; | ||
1397 | |||
1398 | if (NULL == address->address) | ||
1399 | { | ||
1400 | GNUNET_break (0); | ||
1401 | return NULL; | ||
1402 | } | ||
1403 | if (sizeof(struct IPv4UdpAddress) == address->address_length) | ||
1404 | { | ||
1405 | if (NULL == plugin->sockv4) | ||
1406 | return NULL; | ||
1407 | udp_a4 = (const struct IPv4UdpAddress *) address->address; | ||
1408 | if (0 == udp_a4->u4_port) | ||
1409 | { | ||
1410 | GNUNET_break (0); | ||
1411 | return NULL; | ||
1412 | } | ||
1413 | } | ||
1414 | else if (sizeof(struct IPv6UdpAddress) == address->address_length) | ||
1415 | { | ||
1416 | if (NULL == plugin->sockv6) | ||
1417 | return NULL; | ||
1418 | udp_a6 = (const struct IPv6UdpAddress *) address->address; | ||
1419 | if (0 == udp_a6->u6_port) | ||
1420 | { | ||
1421 | GNUNET_break (0); | ||
1422 | return NULL; | ||
1423 | } | ||
1424 | } | ||
1425 | else | ||
1426 | { | ||
1427 | GNUNET_break (0); | ||
1428 | return NULL; | ||
1429 | } | ||
1430 | |||
1431 | /* check if session already exists */ | ||
1432 | cctx.address = address; | ||
1433 | cctx.res = NULL; | ||
1434 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1435 | "Looking for existing session for peer `%s' with address `%s'\n", | ||
1436 | GNUNET_i2s (&address->peer), | ||
1437 | udp_address_to_string (plugin, | ||
1438 | address->address, | ||
1439 | address->address_length)); | ||
1440 | GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions, | ||
1441 | &address->peer, | ||
1442 | &session_cmp_it, | ||
1443 | &cctx); | ||
1444 | if (NULL == cctx.res) | ||
1445 | return NULL; | ||
1446 | LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res); | ||
1447 | return cctx.res; | ||
1448 | } | ||
1449 | |||
1450 | |||
1451 | /* ********************** Timeout ****************** */ | ||
1452 | |||
1453 | |||
1454 | /** | ||
1455 | * Increment session timeout due to activity. | ||
1456 | * | ||
1457 | * @param s session to reschedule timeout activity for | ||
1458 | */ | ||
1459 | static void | ||
1460 | reschedule_session_timeout (struct GNUNET_ATS_Session *s) | ||
1461 | { | ||
1462 | if (GNUNET_YES == s->in_destroy) | ||
1463 | return; | ||
1464 | GNUNET_assert (NULL != s->timeout_task); | ||
1465 | s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT); | ||
1466 | } | ||
1467 | |||
1468 | |||
1469 | /** | ||
1470 | * Function that will be called whenever the transport service wants to | ||
1471 | * notify the plugin that a session is still active and in use and | ||
1472 | * therefore the session timeout for this session has to be updated | ||
1473 | * | ||
1474 | * @param cls closure with the `struct Plugin` | ||
1475 | * @param peer which peer was the session for | ||
1476 | * @param session which session is being updated | ||
1477 | */ | ||
1478 | static void | ||
1479 | udp_plugin_update_session_timeout (void *cls, | ||
1480 | const struct GNUNET_PeerIdentity *peer, | ||
1481 | struct GNUNET_ATS_Session *session) | ||
1482 | { | ||
1483 | struct Plugin *plugin = cls; | ||
1484 | |||
1485 | if (GNUNET_YES != | ||
1486 | GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions, | ||
1487 | peer, | ||
1488 | session)) | ||
1489 | { | ||
1490 | GNUNET_break (0); | ||
1491 | return; | ||
1492 | } | ||
1493 | /* Reschedule session timeout */ | ||
1494 | reschedule_session_timeout (session); | ||
1495 | } | ||
1496 | |||
1497 | |||
1498 | /* ************************* Sending ************************ */ | ||
1499 | |||
1500 | |||
1501 | /** | ||
1502 | * Remove the given message from the transmission queue and | ||
1503 | * update all applicable statistics. | ||
1504 | * | ||
1505 | * @param plugin the UDP plugin | ||
1506 | * @param udpw message wrapper to dequeue | ||
1507 | */ | ||
1508 | static void | ||
1509 | dequeue (struct Plugin *plugin, struct UDP_MessageWrapper *udpw) | ||
1510 | { | ||
1511 | struct GNUNET_ATS_Session *session = udpw->session; | ||
1512 | |||
1513 | if (plugin->bytes_in_buffer < udpw->msg_size) | ||
1514 | { | ||
1515 | GNUNET_break (0); | ||
1516 | } | ||
1517 | else | ||
1518 | { | ||
1519 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1520 | "# UDP, total bytes in send buffers", | ||
1521 | -(long long) udpw->msg_size, | ||
1522 | GNUNET_NO); | ||
1523 | plugin->bytes_in_buffer -= udpw->msg_size; | ||
1524 | } | ||
1525 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1526 | "# UDP, total messages in send buffers", | ||
1527 | -1, | ||
1528 | GNUNET_NO); | ||
1529 | if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length) | ||
1530 | { | ||
1531 | GNUNET_CONTAINER_DLL_remove (plugin->ipv4_queue_head, | ||
1532 | plugin->ipv4_queue_tail, | ||
1533 | udpw); | ||
1534 | } | ||
1535 | else if (sizeof(struct IPv6UdpAddress) == | ||
1536 | udpw->session->address->address_length) | ||
1537 | { | ||
1538 | GNUNET_CONTAINER_DLL_remove (plugin->ipv6_queue_head, | ||
1539 | plugin->ipv6_queue_tail, | ||
1540 | udpw); | ||
1541 | } | ||
1542 | else | ||
1543 | { | ||
1544 | GNUNET_break (0); | ||
1545 | return; | ||
1546 | } | ||
1547 | GNUNET_assert (session->msgs_in_queue > 0); | ||
1548 | session->msgs_in_queue--; | ||
1549 | GNUNET_assert (session->bytes_in_queue >= udpw->msg_size); | ||
1550 | session->bytes_in_queue -= udpw->msg_size; | ||
1551 | } | ||
1552 | |||
1553 | |||
1554 | /** | ||
1555 | * Enqueue a message for transmission and update statistics. | ||
1556 | * | ||
1557 | * @param plugin the UDP plugin | ||
1558 | * @param udpw message wrapper to queue | ||
1559 | */ | ||
1560 | static void | ||
1561 | enqueue (struct Plugin *plugin, struct UDP_MessageWrapper *udpw) | ||
1562 | { | ||
1563 | struct GNUNET_ATS_Session *session = udpw->session; | ||
1564 | |||
1565 | if (GNUNET_YES == session->in_destroy) | ||
1566 | { | ||
1567 | GNUNET_break (0); | ||
1568 | GNUNET_free (udpw); | ||
1569 | return; | ||
1570 | } | ||
1571 | if (plugin->bytes_in_buffer > INT64_MAX - udpw->msg_size) | ||
1572 | { | ||
1573 | GNUNET_break (0); | ||
1574 | } | ||
1575 | else | ||
1576 | { | ||
1577 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1578 | "# UDP, total bytes in send buffers", | ||
1579 | udpw->msg_size, | ||
1580 | GNUNET_NO); | ||
1581 | plugin->bytes_in_buffer += udpw->msg_size; | ||
1582 | } | ||
1583 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1584 | "# UDP, total messages in send buffers", | ||
1585 | 1, | ||
1586 | GNUNET_NO); | ||
1587 | if (sizeof(struct IPv4UdpAddress) == udpw->session->address->address_length) | ||
1588 | { | ||
1589 | GNUNET_CONTAINER_DLL_insert (plugin->ipv4_queue_head, | ||
1590 | plugin->ipv4_queue_tail, | ||
1591 | udpw); | ||
1592 | } | ||
1593 | else if (sizeof(struct IPv6UdpAddress) == | ||
1594 | udpw->session->address->address_length) | ||
1595 | { | ||
1596 | GNUNET_CONTAINER_DLL_insert (plugin->ipv6_queue_head, | ||
1597 | plugin->ipv6_queue_tail, | ||
1598 | udpw); | ||
1599 | } | ||
1600 | else | ||
1601 | { | ||
1602 | GNUNET_break (0); | ||
1603 | udpw->cont (udpw->cont_cls, | ||
1604 | &session->target, | ||
1605 | GNUNET_SYSERR, | ||
1606 | udpw->msg_size, | ||
1607 | 0); | ||
1608 | GNUNET_free (udpw); | ||
1609 | return; | ||
1610 | } | ||
1611 | session->msgs_in_queue++; | ||
1612 | session->bytes_in_queue += udpw->msg_size; | ||
1613 | } | ||
1614 | |||
1615 | |||
1616 | /** | ||
1617 | * We have completed our (attempt) to transmit a message that had to | ||
1618 | * be fragmented -- either because we got an ACK saying that all | ||
1619 | * fragments were received, or because of timeout / disconnect. Clean | ||
1620 | * up our state. | ||
1621 | * | ||
1622 | * @param frag_ctx fragmentation context to clean up | ||
1623 | * @param result #GNUNET_OK if we succeeded (got ACK), | ||
1624 | * #GNUNET_SYSERR if the transmission failed | ||
1625 | */ | ||
1626 | static void | ||
1627 | fragmented_message_done (struct UDP_FragmentationContext *frag_ctx, int result) | ||
1628 | { | ||
1629 | struct Plugin *plugin = frag_ctx->plugin; | ||
1630 | struct GNUNET_ATS_Session *s = frag_ctx->session; | ||
1631 | struct UDP_MessageWrapper *udpw; | ||
1632 | struct UDP_MessageWrapper *tmp; | ||
1633 | size_t overhead; | ||
1634 | struct GNUNET_TIME_Relative delay; | ||
1635 | |||
1636 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1637 | "%p: Fragmented message removed with result %s\n", | ||
1638 | frag_ctx, | ||
1639 | (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS"); | ||
1640 | /* Call continuation for fragmented message */ | ||
1641 | if (frag_ctx->on_wire_size >= frag_ctx->payload_size) | ||
1642 | overhead = frag_ctx->on_wire_size - frag_ctx->payload_size; | ||
1643 | else | ||
1644 | overhead = frag_ctx->on_wire_size; | ||
1645 | delay = GNUNET_TIME_absolute_get_duration (frag_ctx->start_time); | ||
1646 | if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
1647 | { | ||
1648 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
1649 | "Fragmented message acknowledged after %s (expected at %s)\n", | ||
1650 | GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES), | ||
1651 | GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time)); | ||
1652 | } | ||
1653 | else | ||
1654 | { | ||
1655 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1656 | "Fragmented message acknowledged after %s (expected at %s)\n", | ||
1657 | GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES), | ||
1658 | GNUNET_STRINGS_absolute_time_to_string (frag_ctx->next_frag_time)); | ||
1659 | } | ||
1660 | |||
1661 | if (NULL != frag_ctx->cont) | ||
1662 | frag_ctx->cont (frag_ctx->cont_cls, | ||
1663 | &s->target, | ||
1664 | result, | ||
1665 | s->frag_ctx->payload_size, | ||
1666 | frag_ctx->on_wire_size); | ||
1667 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1668 | "# UDP, fragmented messages active", | ||
1669 | -1, | ||
1670 | GNUNET_NO); | ||
1671 | |||
1672 | if (GNUNET_OK == result) | ||
1673 | { | ||
1674 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1675 | "# UDP, fragmented msgs, messages, sent, success", | ||
1676 | 1, | ||
1677 | GNUNET_NO); | ||
1678 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1679 | "# UDP, fragmented msgs, bytes payload, sent, success", | ||
1680 | s->frag_ctx->payload_size, | ||
1681 | GNUNET_NO); | ||
1682 | GNUNET_STATISTICS_update ( | ||
1683 | plugin->env->stats, | ||
1684 | "# UDP, fragmented msgs, bytes overhead, sent, success", | ||
1685 | overhead, | ||
1686 | GNUNET_NO); | ||
1687 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1688 | "# UDP, total, bytes overhead, sent", | ||
1689 | overhead, | ||
1690 | GNUNET_NO); | ||
1691 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1692 | "# UDP, total, bytes payload, sent", | ||
1693 | s->frag_ctx->payload_size, | ||
1694 | GNUNET_NO); | ||
1695 | } | ||
1696 | else | ||
1697 | { | ||
1698 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1699 | "# UDP, fragmented msgs, messages, sent, failure", | ||
1700 | 1, | ||
1701 | GNUNET_NO); | ||
1702 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1703 | "# UDP, fragmented msgs, bytes payload, sent, failure", | ||
1704 | s->frag_ctx->payload_size, | ||
1705 | GNUNET_NO); | ||
1706 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1707 | "# UDP, fragmented msgs, bytes payload, sent, failure", | ||
1708 | overhead, | ||
1709 | GNUNET_NO); | ||
1710 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1711 | "# UDP, fragmented msgs, bytes payload, sent, failure", | ||
1712 | overhead, | ||
1713 | GNUNET_NO); | ||
1714 | } | ||
1715 | |||
1716 | /* Remove remaining fragments from queue, no need to transmit those | ||
1717 | any longer. */ | ||
1718 | if (s->address->address_length == sizeof(struct IPv6UdpAddress)) | ||
1719 | { | ||
1720 | udpw = plugin->ipv6_queue_head; | ||
1721 | while (NULL != udpw) | ||
1722 | { | ||
1723 | tmp = udpw->next; | ||
1724 | if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == frag_ctx)) | ||
1725 | { | ||
1726 | dequeue (plugin, udpw); | ||
1727 | GNUNET_free (udpw); | ||
1728 | } | ||
1729 | udpw = tmp; | ||
1730 | } | ||
1731 | } | ||
1732 | if (s->address->address_length == sizeof(struct IPv4UdpAddress)) | ||
1733 | { | ||
1734 | udpw = plugin->ipv4_queue_head; | ||
1735 | while (NULL != udpw) | ||
1736 | { | ||
1737 | tmp = udpw->next; | ||
1738 | if ((NULL != udpw->frag_ctx) && (udpw->frag_ctx == frag_ctx)) | ||
1739 | { | ||
1740 | dequeue (plugin, udpw); | ||
1741 | GNUNET_free (udpw); | ||
1742 | } | ||
1743 | udpw = tmp; | ||
1744 | } | ||
1745 | } | ||
1746 | notify_session_monitor (s->plugin, s, GNUNET_TRANSPORT_SS_UPDATE); | ||
1747 | GNUNET_FRAGMENT_context_destroy (frag_ctx->frag, | ||
1748 | &s->last_expected_msg_delay, | ||
1749 | &s->last_expected_ack_delay); | ||
1750 | s->frag_ctx = NULL; | ||
1751 | GNUNET_free (frag_ctx); | ||
1752 | } | ||
1753 | |||
1754 | |||
1755 | /** | ||
1756 | * We are finished with a fragment in the message queue. | ||
1757 | * Notify the continuation and update statistics. | ||
1758 | * | ||
1759 | * @param cls the `struct Plugin *` | ||
1760 | * @param udpw the queue entry | ||
1761 | * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure | ||
1762 | */ | ||
1763 | static void | ||
1764 | qc_fragment_sent (void *cls, struct UDP_MessageWrapper *udpw, int result) | ||
1765 | { | ||
1766 | struct Plugin *plugin = cls; | ||
1767 | |||
1768 | GNUNET_assert (NULL != udpw->frag_ctx); | ||
1769 | if (GNUNET_OK == result) | ||
1770 | { | ||
1771 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
1772 | "Fragment of message with %u bytes transmitted to %s\n", | ||
1773 | (unsigned int) udpw->payload_size, | ||
1774 | GNUNET_i2s (&udpw->session->target)); | ||
1775 | GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag); | ||
1776 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1777 | "# UDP, fragmented msgs, fragments, sent, success", | ||
1778 | 1, | ||
1779 | GNUNET_NO); | ||
1780 | GNUNET_STATISTICS_update ( | ||
1781 | plugin->env->stats, | ||
1782 | "# UDP, fragmented msgs, fragments bytes, sent, success", | ||
1783 | udpw->msg_size, | ||
1784 | GNUNET_NO); | ||
1785 | } | ||
1786 | else | ||
1787 | { | ||
1788 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
1789 | "Failed to transmit fragment of message with %u bytes to %s\n", | ||
1790 | (unsigned int) udpw->payload_size, | ||
1791 | GNUNET_i2s (&udpw->session->target)); | ||
1792 | fragmented_message_done (udpw->frag_ctx, GNUNET_SYSERR); | ||
1793 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1794 | "# UDP, fragmented msgs, fragments, sent, failure", | ||
1795 | 1, | ||
1796 | GNUNET_NO); | ||
1797 | GNUNET_STATISTICS_update ( | ||
1798 | plugin->env->stats, | ||
1799 | "# UDP, fragmented msgs, fragments bytes, sent, failure", | ||
1800 | udpw->msg_size, | ||
1801 | GNUNET_NO); | ||
1802 | } | ||
1803 | } | ||
1804 | |||
1805 | |||
1806 | /** | ||
1807 | * Function that is called with messages created by the fragmentation | ||
1808 | * module. In the case of the `proc` callback of the | ||
1809 | * #GNUNET_FRAGMENT_context_create() function, this function must | ||
1810 | * eventually call #GNUNET_FRAGMENT_context_transmission_done(). | ||
1811 | * | ||
1812 | * @param cls closure, the `struct UDP_FragmentationContext` | ||
1813 | * @param msg the message that was created | ||
1814 | */ | ||
1815 | static void | ||
1816 | enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg) | ||
1817 | { | ||
1818 | struct UDP_FragmentationContext *frag_ctx = cls; | ||
1819 | struct Plugin *plugin = frag_ctx->plugin; | ||
1820 | struct UDP_MessageWrapper *udpw; | ||
1821 | struct GNUNET_ATS_Session *session = frag_ctx->session; | ||
1822 | size_t msg_len = ntohs (msg->size); | ||
1823 | |||
1824 | LOG (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %lu bytes\n", | ||
1825 | (unsigned long) msg_len); | ||
1826 | udpw = GNUNET_malloc (sizeof(struct UDP_MessageWrapper) + msg_len); | ||
1827 | udpw->session = session; | ||
1828 | udpw->msg_buf = (char *) &udpw[1]; | ||
1829 | udpw->msg_size = msg_len; | ||
1830 | udpw->payload_size = msg_len; /* FIXME: minus fragment overhead */ | ||
1831 | udpw->timeout = frag_ctx->timeout; | ||
1832 | udpw->start_time = frag_ctx->start_time; | ||
1833 | udpw->transmission_time = frag_ctx->next_frag_time; | ||
1834 | frag_ctx->next_frag_time = | ||
1835 | GNUNET_TIME_absolute_add (frag_ctx->next_frag_time, | ||
1836 | frag_ctx->flow_delay_from_other_peer); | ||
1837 | udpw->frag_ctx = frag_ctx; | ||
1838 | udpw->qc = &qc_fragment_sent; | ||
1839 | udpw->qc_cls = plugin; | ||
1840 | GNUNET_memcpy (udpw->msg_buf, msg, msg_len); | ||
1841 | enqueue (plugin, udpw); | ||
1842 | if (session->address->address_length == sizeof(struct IPv4UdpAddress)) | ||
1843 | schedule_select_v4 (plugin); | ||
1844 | else | ||
1845 | schedule_select_v6 (plugin); | ||
1846 | } | ||
1847 | |||
1848 | |||
1849 | /** | ||
1850 | * We are finished with a message from the message queue. | ||
1851 | * Notify the continuation and update statistics. | ||
1852 | * | ||
1853 | * @param cls the `struct Plugin *` | ||
1854 | * @param udpw the queue entry | ||
1855 | * @param result #GNUNET_OK on success, #GNUNET_SYSERR on failure | ||
1856 | */ | ||
1857 | static void | ||
1858 | qc_message_sent (void *cls, struct UDP_MessageWrapper *udpw, int result) | ||
1859 | { | ||
1860 | struct Plugin *plugin = cls; | ||
1861 | size_t overhead; | ||
1862 | struct GNUNET_TIME_Relative delay; | ||
1863 | |||
1864 | if (udpw->msg_size >= udpw->payload_size) | ||
1865 | overhead = udpw->msg_size - udpw->payload_size; | ||
1866 | else | ||
1867 | overhead = udpw->msg_size; | ||
1868 | |||
1869 | if (NULL != udpw->cont) | ||
1870 | { | ||
1871 | delay = GNUNET_TIME_absolute_get_duration (udpw->start_time); | ||
1872 | if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
1873 | { | ||
1874 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
1875 | "Message sent via UDP with delay of %s\n", | ||
1876 | GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES)); | ||
1877 | } | ||
1878 | else | ||
1879 | { | ||
1880 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1881 | "Message sent via UDP with delay of %s\n", | ||
1882 | GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES)); | ||
1883 | } | ||
1884 | udpw->cont (udpw->cont_cls, | ||
1885 | &udpw->session->target, | ||
1886 | result, | ||
1887 | udpw->payload_size, | ||
1888 | overhead); | ||
1889 | } | ||
1890 | if (GNUNET_OK == result) | ||
1891 | { | ||
1892 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1893 | "# UDP, unfragmented msgs, messages, sent, success", | ||
1894 | 1, | ||
1895 | GNUNET_NO); | ||
1896 | GNUNET_STATISTICS_update ( | ||
1897 | plugin->env->stats, | ||
1898 | "# UDP, unfragmented msgs, bytes payload, sent, success", | ||
1899 | udpw->payload_size, | ||
1900 | GNUNET_NO); | ||
1901 | GNUNET_STATISTICS_update ( | ||
1902 | plugin->env->stats, | ||
1903 | "# UDP, unfragmented msgs, bytes overhead, sent, success", | ||
1904 | overhead, | ||
1905 | GNUNET_NO); | ||
1906 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1907 | "# UDP, total, bytes overhead, sent", | ||
1908 | overhead, | ||
1909 | GNUNET_NO); | ||
1910 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1911 | "# UDP, total, bytes payload, sent", | ||
1912 | udpw->payload_size, | ||
1913 | GNUNET_NO); | ||
1914 | } | ||
1915 | else | ||
1916 | { | ||
1917 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1918 | "# UDP, unfragmented msgs, messages, sent, failure", | ||
1919 | 1, | ||
1920 | GNUNET_NO); | ||
1921 | GNUNET_STATISTICS_update ( | ||
1922 | plugin->env->stats, | ||
1923 | "# UDP, unfragmented msgs, bytes payload, sent, failure", | ||
1924 | udpw->payload_size, | ||
1925 | GNUNET_NO); | ||
1926 | GNUNET_STATISTICS_update ( | ||
1927 | plugin->env->stats, | ||
1928 | "# UDP, unfragmented msgs, bytes overhead, sent, failure", | ||
1929 | overhead, | ||
1930 | GNUNET_NO); | ||
1931 | } | ||
1932 | } | ||
1933 | |||
1934 | |||
1935 | /** | ||
1936 | * Function that can be used by the transport service to transmit a | ||
1937 | * message using the plugin. Note that in the case of a peer | ||
1938 | * disconnecting, the continuation MUST be called prior to the | ||
1939 | * disconnect notification itself. This function will be called with | ||
1940 | * this peer's HELLO message to initiate a fresh connection to another | ||
1941 | * peer. | ||
1942 | * | ||
1943 | * @param cls closure | ||
1944 | * @param s which session must be used | ||
1945 | * @param msgbuf the message to transmit | ||
1946 | * @param msgbuf_size number of bytes in @a msgbuf | ||
1947 | * @param priority how important is the message (most plugins will | ||
1948 | * ignore message priority and just FIFO) | ||
1949 | * @param to how long to wait at most for the transmission (does not | ||
1950 | * require plugins to discard the message after the timeout, | ||
1951 | * just advisory for the desired delay; most plugins will ignore | ||
1952 | * this as well) | ||
1953 | * @param cont continuation to call once the message has | ||
1954 | * been transmitted (or if the transport is ready | ||
1955 | * for the next transmission call; or if the | ||
1956 | * peer disconnected...); can be NULL | ||
1957 | * @param cont_cls closure for @a cont | ||
1958 | * @return number of bytes used (on the physical network, with overheads); | ||
1959 | * -1 on hard errors (i.e. address invalid); 0 is a legal value | ||
1960 | * and does NOT mean that the message was not transmitted (DV) | ||
1961 | */ | ||
1962 | static ssize_t | ||
1963 | udp_plugin_send (void *cls, | ||
1964 | struct GNUNET_ATS_Session *s, | ||
1965 | const char *msgbuf, | ||
1966 | size_t msgbuf_size, | ||
1967 | unsigned int priority, | ||
1968 | struct GNUNET_TIME_Relative to, | ||
1969 | GNUNET_TRANSPORT_TransmitContinuation cont, | ||
1970 | void *cont_cls) | ||
1971 | { | ||
1972 | struct Plugin *plugin = cls; | ||
1973 | size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage); | ||
1974 | struct UDP_FragmentationContext *frag_ctx; | ||
1975 | struct UDP_MessageWrapper *udpw; | ||
1976 | struct UDPMessage *udp; | ||
1977 | char mbuf[udpmlen] GNUNET_ALIGN; | ||
1978 | struct GNUNET_TIME_Relative latency; | ||
1979 | |||
1980 | if ((sizeof(struct IPv6UdpAddress) == s->address->address_length) && | ||
1981 | (NULL == plugin->sockv6)) | ||
1982 | return GNUNET_SYSERR; | ||
1983 | if ((sizeof(struct IPv4UdpAddress) == s->address->address_length) && | ||
1984 | (NULL == plugin->sockv4)) | ||
1985 | return GNUNET_SYSERR; | ||
1986 | if (udpmlen >= GNUNET_MAX_MESSAGE_SIZE) | ||
1987 | { | ||
1988 | GNUNET_break (0); | ||
1989 | return GNUNET_SYSERR; | ||
1990 | } | ||
1991 | if (GNUNET_YES != | ||
1992 | GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions, | ||
1993 | &s->target, | ||
1994 | s)) | ||
1995 | { | ||
1996 | GNUNET_break (0); | ||
1997 | return GNUNET_SYSERR; | ||
1998 | } | ||
1999 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2000 | "UDP transmits %lu-byte message to `%s' using address `%s'\n", | ||
2001 | (unsigned long) udpmlen, | ||
2002 | GNUNET_i2s (&s->target), | ||
2003 | udp_address_to_string (plugin, | ||
2004 | s->address->address, | ||
2005 | s->address->address_length)); | ||
2006 | |||
2007 | udp = (struct UDPMessage *) mbuf; | ||
2008 | udp->header.size = htons (udpmlen); | ||
2009 | udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE); | ||
2010 | udp->reserved = htonl (0); | ||
2011 | udp->sender = *plugin->env->my_identity; | ||
2012 | |||
2013 | /* We do not update the session time out here! Otherwise this | ||
2014 | * session will not timeout since we send keep alive before session | ||
2015 | * can timeout. | ||
2016 | * | ||
2017 | * For UDP we update session timeout only on receive, this will | ||
2018 | * cover keep alives, since remote peer will reply with keep alive | ||
2019 | * responses! | ||
2020 | */if (udpmlen <= UDP_MTU) | ||
2021 | { | ||
2022 | /* unfragmented message */ | ||
2023 | udpw = GNUNET_malloc (sizeof(struct UDP_MessageWrapper) + udpmlen); | ||
2024 | udpw->session = s; | ||
2025 | udpw->msg_buf = (char *) &udpw[1]; | ||
2026 | udpw->msg_size = udpmlen; /* message size with UDP overhead */ | ||
2027 | udpw->payload_size = msgbuf_size; /* message size without UDP overhead */ | ||
2028 | udpw->start_time = GNUNET_TIME_absolute_get (); | ||
2029 | udpw->timeout = GNUNET_TIME_relative_to_absolute (to); | ||
2030 | udpw->transmission_time = s->last_transmit_time; | ||
2031 | s->last_transmit_time = | ||
2032 | GNUNET_TIME_absolute_add (s->last_transmit_time, | ||
2033 | s->flow_delay_from_other_peer); | ||
2034 | udpw->cont = cont; | ||
2035 | udpw->cont_cls = cont_cls; | ||
2036 | udpw->frag_ctx = NULL; | ||
2037 | udpw->qc = &qc_message_sent; | ||
2038 | udpw->qc_cls = plugin; | ||
2039 | GNUNET_memcpy (udpw->msg_buf, udp, sizeof(struct UDPMessage)); | ||
2040 | GNUNET_memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)], | ||
2041 | msgbuf, | ||
2042 | msgbuf_size); | ||
2043 | enqueue (plugin, udpw); | ||
2044 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2045 | "# UDP, unfragmented messages queued total", | ||
2046 | 1, | ||
2047 | GNUNET_NO); | ||
2048 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2049 | "# UDP, unfragmented bytes payload queued total", | ||
2050 | msgbuf_size, | ||
2051 | GNUNET_NO); | ||
2052 | if (s->address->address_length == sizeof(struct IPv4UdpAddress)) | ||
2053 | schedule_select_v4 (plugin); | ||
2054 | else | ||
2055 | schedule_select_v6 (plugin); | ||
2056 | } | ||
2057 | else | ||
2058 | { | ||
2059 | /* fragmented message */ | ||
2060 | if (NULL != s->frag_ctx) | ||
2061 | return GNUNET_SYSERR; | ||
2062 | GNUNET_memcpy (&udp[1], msgbuf, msgbuf_size); | ||
2063 | frag_ctx = GNUNET_new (struct UDP_FragmentationContext); | ||
2064 | frag_ctx->plugin = plugin; | ||
2065 | frag_ctx->session = s; | ||
2066 | frag_ctx->cont = cont; | ||
2067 | frag_ctx->cont_cls = cont_cls; | ||
2068 | frag_ctx->start_time = GNUNET_TIME_absolute_get (); | ||
2069 | frag_ctx->next_frag_time = s->last_transmit_time; | ||
2070 | frag_ctx->flow_delay_from_other_peer = | ||
2071 | GNUNET_TIME_relative_divide (s->flow_delay_from_other_peer, | ||
2072 | 1 + (msgbuf_size / UDP_MTU)); | ||
2073 | frag_ctx->timeout = GNUNET_TIME_relative_to_absolute (to); | ||
2074 | frag_ctx->payload_size = | ||
2075 | msgbuf_size; /* unfragmented message size without UDP overhead */ | ||
2076 | frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */ | ||
2077 | frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats, | ||
2078 | UDP_MTU, | ||
2079 | &plugin->tracker, | ||
2080 | s->last_expected_msg_delay, | ||
2081 | s->last_expected_ack_delay, | ||
2082 | &udp->header, | ||
2083 | &enqueue_fragment, | ||
2084 | frag_ctx); | ||
2085 | s->frag_ctx = frag_ctx; | ||
2086 | s->last_transmit_time = frag_ctx->next_frag_time; | ||
2087 | latency = GNUNET_TIME_absolute_get_remaining (s->last_transmit_time); | ||
2088 | if (latency.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
2089 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2090 | "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n", | ||
2091 | GNUNET_STRINGS_relative_time_to_string (latency, GNUNET_YES), | ||
2092 | GNUNET_i2s (&s->target), | ||
2093 | (unsigned int) s->msgs_in_queue); | ||
2094 | else | ||
2095 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2096 | "Enqueued fragments will take %s for transmission to %s (queue size: %u)\n", | ||
2097 | GNUNET_STRINGS_relative_time_to_string (latency, GNUNET_YES), | ||
2098 | GNUNET_i2s (&s->target), | ||
2099 | (unsigned int) s->msgs_in_queue); | ||
2100 | |||
2101 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2102 | "# UDP, fragmented messages active", | ||
2103 | 1, | ||
2104 | GNUNET_NO); | ||
2105 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2106 | "# UDP, fragmented messages, total", | ||
2107 | 1, | ||
2108 | GNUNET_NO); | ||
2109 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2110 | "# UDP, fragmented bytes (payload)", | ||
2111 | frag_ctx->payload_size, | ||
2112 | GNUNET_NO); | ||
2113 | } | ||
2114 | notify_session_monitor (s->plugin, s, GNUNET_TRANSPORT_SS_UPDATE); | ||
2115 | return udpmlen; | ||
2116 | } | ||
2117 | |||
2118 | |||
2119 | /* ********************** Receiving ********************** */ | ||
2120 | |||
2121 | |||
2122 | /** | ||
2123 | * Closure for #find_receive_context(). | ||
2124 | */ | ||
2125 | struct FindReceiveContext | ||
2126 | { | ||
2127 | /** | ||
2128 | * Where to store the result. | ||
2129 | */ | ||
2130 | struct DefragContext *rc; | ||
2131 | |||
2132 | /** | ||
2133 | * Session associated with this context. | ||
2134 | */ | ||
2135 | struct GNUNET_ATS_Session *session; | ||
2136 | |||
2137 | /** | ||
2138 | * Address to find. | ||
2139 | */ | ||
2140 | const union UdpAddress *udp_addr; | ||
2141 | |||
2142 | /** | ||
2143 | * Number of bytes in @e udp_addr. | ||
2144 | */ | ||
2145 | size_t udp_addr_len; | ||
2146 | }; | ||
2147 | |||
2148 | |||
2149 | /** | ||
2150 | * Scan the heap for a receive context with the given address. | ||
2151 | * | ||
2152 | * @param cls the `struct FindReceiveContext` | ||
2153 | * @param node internal node of the heap | ||
2154 | * @param element value stored at the node (a `struct ReceiveContext`) | ||
2155 | * @param cost cost associated with the node | ||
2156 | * @return #GNUNET_YES if we should continue to iterate, | ||
2157 | * #GNUNET_NO if not. | ||
2158 | */ | ||
2159 | static int | ||
2160 | find_receive_context (void *cls, | ||
2161 | struct GNUNET_CONTAINER_HeapNode *node, | ||
2162 | void *element, | ||
2163 | GNUNET_CONTAINER_HeapCostType cost) | ||
2164 | { | ||
2165 | struct FindReceiveContext *frc = cls; | ||
2166 | struct DefragContext *e = element; | ||
2167 | |||
2168 | if ((frc->udp_addr_len == e->udp_addr_len) && | ||
2169 | (0 == memcmp (frc->udp_addr, e->udp_addr, frc->udp_addr_len))) | ||
2170 | { | ||
2171 | frc->rc = e; | ||
2172 | return GNUNET_NO; | ||
2173 | } | ||
2174 | return GNUNET_YES; | ||
2175 | } | ||
2176 | |||
2177 | |||
2178 | /** | ||
2179 | * Functions with this signature are called whenever we need to close | ||
2180 | * a session due to a disconnect or failure to establish a connection. | ||
2181 | * | ||
2182 | * @param cls closure with the `struct Plugin` | ||
2183 | * @param s session to close down | ||
2184 | * @return #GNUNET_OK on success | ||
2185 | */ | ||
2186 | static int | ||
2187 | udp_disconnect_session (void *cls, struct GNUNET_ATS_Session *s) | ||
2188 | { | ||
2189 | struct Plugin *plugin = cls; | ||
2190 | struct UDP_MessageWrapper *udpw; | ||
2191 | struct UDP_MessageWrapper *next; | ||
2192 | struct FindReceiveContext frc; | ||
2193 | |||
2194 | GNUNET_assert (GNUNET_YES != s->in_destroy); | ||
2195 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2196 | "Session %p to peer `%s' at address %s ended\n", | ||
2197 | s, | ||
2198 | GNUNET_i2s (&s->target), | ||
2199 | udp_address_to_string (plugin, | ||
2200 | s->address->address, | ||
2201 | s->address->address_length)); | ||
2202 | if (NULL != s->timeout_task) | ||
2203 | { | ||
2204 | GNUNET_SCHEDULER_cancel (s->timeout_task); | ||
2205 | s->timeout_task = NULL; | ||
2206 | } | ||
2207 | if (NULL != s->frag_ctx) | ||
2208 | { | ||
2209 | /* Remove fragmented message due to disconnect */ | ||
2210 | fragmented_message_done (s->frag_ctx, GNUNET_SYSERR); | ||
2211 | } | ||
2212 | GNUNET_assert ( | ||
2213 | GNUNET_YES == | ||
2214 | GNUNET_CONTAINER_multipeermap_remove (plugin->sessions, &s->target, s)); | ||
2215 | frc.rc = NULL; | ||
2216 | frc.udp_addr = s->address->address; | ||
2217 | frc.udp_addr_len = s->address->address_length; | ||
2218 | /* Lookup existing receive context for this address */ | ||
2219 | if (NULL != plugin->defrag_ctxs) | ||
2220 | { | ||
2221 | GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs, | ||
2222 | &find_receive_context, | ||
2223 | &frc); | ||
2224 | if (NULL != frc.rc) | ||
2225 | { | ||
2226 | struct DefragContext *d_ctx = frc.rc; | ||
2227 | |||
2228 | GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode); | ||
2229 | GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag); | ||
2230 | GNUNET_free (d_ctx); | ||
2231 | } | ||
2232 | } | ||
2233 | s->in_destroy = GNUNET_YES; | ||
2234 | next = plugin->ipv4_queue_head; | ||
2235 | while (NULL != (udpw = next)) | ||
2236 | { | ||
2237 | next = udpw->next; | ||
2238 | if (udpw->session == s) | ||
2239 | { | ||
2240 | dequeue (plugin, udpw); | ||
2241 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
2242 | GNUNET_free (udpw); | ||
2243 | } | ||
2244 | } | ||
2245 | next = plugin->ipv6_queue_head; | ||
2246 | while (NULL != (udpw = next)) | ||
2247 | { | ||
2248 | next = udpw->next; | ||
2249 | if (udpw->session == s) | ||
2250 | { | ||
2251 | dequeue (plugin, udpw); | ||
2252 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
2253 | GNUNET_free (udpw); | ||
2254 | } | ||
2255 | } | ||
2256 | if ((NULL != s->frag_ctx) && (NULL != s->frag_ctx->cont)) | ||
2257 | { | ||
2258 | /* The 'frag_ctx' itself will be freed in #free_session() a bit | ||
2259 | later, as it might be in use right now */ | ||
2260 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2261 | "Calling continuation for fragemented message to `%s' with result SYSERR\n", | ||
2262 | GNUNET_i2s (&s->target)); | ||
2263 | s->frag_ctx->cont (s->frag_ctx->cont_cls, | ||
2264 | &s->target, | ||
2265 | GNUNET_SYSERR, | ||
2266 | s->frag_ctx->payload_size, | ||
2267 | s->frag_ctx->on_wire_size); | ||
2268 | } | ||
2269 | notify_session_monitor (s->plugin, s, GNUNET_TRANSPORT_SS_DONE); | ||
2270 | plugin->env->session_end (plugin->env->cls, s->address, s); | ||
2271 | GNUNET_STATISTICS_set (plugin->env->stats, | ||
2272 | "# UDP sessions active", | ||
2273 | GNUNET_CONTAINER_multipeermap_size (plugin->sessions), | ||
2274 | GNUNET_NO); | ||
2275 | if (0 == s->rc) | ||
2276 | free_session (s); | ||
2277 | return GNUNET_OK; | ||
2278 | } | ||
2279 | |||
2280 | |||
2281 | /** | ||
2282 | * Handle a #GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK message. | ||
2283 | * | ||
2284 | * @param plugin the UDP plugin | ||
2285 | * @param msg the (presumed) UDP ACK message | ||
2286 | * @param udp_addr sender address | ||
2287 | * @param udp_addr_len number of bytes in @a udp_addr | ||
2288 | */ | ||
2289 | static void | ||
2290 | read_process_ack (struct Plugin *plugin, | ||
2291 | const struct GNUNET_MessageHeader *msg, | ||
2292 | const union UdpAddress *udp_addr, | ||
2293 | socklen_t udp_addr_len) | ||
2294 | { | ||
2295 | const struct GNUNET_MessageHeader *ack; | ||
2296 | const struct UDP_ACK_Message *udp_ack; | ||
2297 | struct GNUNET_HELLO_Address *address; | ||
2298 | struct GNUNET_ATS_Session *s; | ||
2299 | struct GNUNET_TIME_Relative flow_delay; | ||
2300 | |||
2301 | /* check message format */ | ||
2302 | if (ntohs (msg->size) < | ||
2303 | sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader)) | ||
2304 | { | ||
2305 | GNUNET_break_op (0); | ||
2306 | return; | ||
2307 | } | ||
2308 | udp_ack = (const struct UDP_ACK_Message *) msg; | ||
2309 | ack = (const struct GNUNET_MessageHeader *) &udp_ack[1]; | ||
2310 | if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message)) | ||
2311 | { | ||
2312 | GNUNET_break_op (0); | ||
2313 | return; | ||
2314 | } | ||
2315 | |||
2316 | /* Locate session */ | ||
2317 | address = GNUNET_HELLO_address_allocate (&udp_ack->sender, | ||
2318 | PLUGIN_NAME, | ||
2319 | udp_addr, | ||
2320 | udp_addr_len, | ||
2321 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
2322 | s = udp_plugin_lookup_session (plugin, address); | ||
2323 | if (NULL == s) | ||
2324 | { | ||
2325 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2326 | "UDP session of address %s for ACK not found\n", | ||
2327 | udp_address_to_string (plugin, | ||
2328 | address->address, | ||
2329 | address->address_length)); | ||
2330 | GNUNET_HELLO_address_free (address); | ||
2331 | return; | ||
2332 | } | ||
2333 | if (NULL == s->frag_ctx) | ||
2334 | { | ||
2335 | LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK, | ||
2336 | "Fragmentation context of address %s for ACK (%s) not found\n", | ||
2337 | udp_address_to_string (plugin, | ||
2338 | address->address, | ||
2339 | address->address_length), | ||
2340 | GNUNET_FRAGMENT_print_ack (ack)); | ||
2341 | GNUNET_HELLO_address_free (address); | ||
2342 | return; | ||
2343 | } | ||
2344 | GNUNET_HELLO_address_free (address); | ||
2345 | |||
2346 | /* evaluate flow delay: how long should we wait between messages? */ | ||
2347 | if (UINT32_MAX == ntohl (udp_ack->delay)) | ||
2348 | { | ||
2349 | /* Other peer asked for us to terminate the session */ | ||
2350 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
2351 | "Asked to disconnect UDP session of %s\n", | ||
2352 | GNUNET_i2s (&udp_ack->sender)); | ||
2353 | udp_disconnect_session (plugin, s); | ||
2354 | return; | ||
2355 | } | ||
2356 | flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay); | ||
2357 | if (flow_delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us) | ||
2358 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2359 | "We received a sending delay of %s for %s\n", | ||
2360 | GNUNET_STRINGS_relative_time_to_string (flow_delay, GNUNET_YES), | ||
2361 | GNUNET_i2s (&udp_ack->sender)); | ||
2362 | else | ||
2363 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2364 | "We received a sending delay of %s for %s\n", | ||
2365 | GNUNET_STRINGS_relative_time_to_string (flow_delay, GNUNET_YES), | ||
2366 | GNUNET_i2s (&udp_ack->sender)); | ||
2367 | /* Flow delay is for the reassembled packet, however, our delay | ||
2368 | is per packet, so we need to adjust: */ | ||
2369 | s->flow_delay_from_other_peer = flow_delay; | ||
2370 | |||
2371 | /* Handle ACK */ | ||
2372 | if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack)) | ||
2373 | { | ||
2374 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2375 | "UDP processes %u-byte acknowledgement from `%s' at `%s'\n", | ||
2376 | (unsigned int) ntohs (msg->size), | ||
2377 | GNUNET_i2s (&udp_ack->sender), | ||
2378 | udp_address_to_string (plugin, udp_addr, udp_addr_len)); | ||
2379 | /* Expect more ACKs to arrive */ | ||
2380 | return; | ||
2381 | } | ||
2382 | |||
2383 | /* Remove fragmented message after successful sending */ | ||
2384 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2385 | "Message from %s at %s full ACK'ed\n", | ||
2386 | GNUNET_i2s (&udp_ack->sender), | ||
2387 | udp_address_to_string (plugin, udp_addr, udp_addr_len)); | ||
2388 | fragmented_message_done (s->frag_ctx, GNUNET_OK); | ||
2389 | } | ||
2390 | |||
2391 | |||
2392 | /** | ||
2393 | * Message tokenizer has broken up an incoming message. Pass it on | ||
2394 | * to the service. | ||
2395 | * | ||
2396 | * @param cls the `struct GNUNET_ATS_Session *` | ||
2397 | * @param hdr the actual message | ||
2398 | * @return #GNUNET_OK (always) | ||
2399 | */ | ||
2400 | static int | ||
2401 | process_inbound_tokenized_messages (void *cls, | ||
2402 | const struct GNUNET_MessageHeader *hdr) | ||
2403 | { | ||
2404 | struct GNUNET_ATS_Session *session = cls; | ||
2405 | struct Plugin *plugin = session->plugin; | ||
2406 | |||
2407 | if (GNUNET_YES == session->in_destroy) | ||
2408 | return GNUNET_OK; | ||
2409 | reschedule_session_timeout (session); | ||
2410 | session->flow_delay_for_other_peer = | ||
2411 | plugin->env->receive (plugin->env->cls, session->address, session, hdr); | ||
2412 | return GNUNET_OK; | ||
2413 | } | ||
2414 | |||
2415 | |||
2416 | /** | ||
2417 | * Destroy a session, plugin is being unloaded. | ||
2418 | * | ||
2419 | * @param cls the `struct Plugin` | ||
2420 | * @param key hash of public key of target peer | ||
2421 | * @param value a `struct PeerSession *` to clean up | ||
2422 | * @return #GNUNET_OK (continue to iterate) | ||
2423 | */ | ||
2424 | static int | ||
2425 | disconnect_and_free_it (void *cls, | ||
2426 | const struct GNUNET_PeerIdentity *key, | ||
2427 | void *value) | ||
2428 | { | ||
2429 | struct Plugin *plugin = cls; | ||
2430 | |||
2431 | udp_disconnect_session (plugin, value); | ||
2432 | return GNUNET_OK; | ||
2433 | } | ||
2434 | |||
2435 | |||
2436 | /** | ||
2437 | * Disconnect from a remote node. Clean up session if we have one for | ||
2438 | * this peer. | ||
2439 | * | ||
2440 | * @param cls closure for this call (should be handle to Plugin) | ||
2441 | * @param target the peeridentity of the peer to disconnect | ||
2442 | * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed | ||
2443 | */ | ||
2444 | static void | ||
2445 | udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target) | ||
2446 | { | ||
2447 | struct Plugin *plugin = cls; | ||
2448 | |||
2449 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2450 | "Disconnecting from peer `%s'\n", | ||
2451 | GNUNET_i2s (target)); | ||
2452 | GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions, | ||
2453 | target, | ||
2454 | &disconnect_and_free_it, | ||
2455 | plugin); | ||
2456 | } | ||
2457 | |||
2458 | |||
2459 | /** | ||
2460 | * Session was idle, so disconnect it. | ||
2461 | * | ||
2462 | * @param cls the `struct GNUNET_ATS_Session` to time out | ||
2463 | */ | ||
2464 | static void | ||
2465 | session_timeout (void *cls) | ||
2466 | { | ||
2467 | struct GNUNET_ATS_Session *s = cls; | ||
2468 | struct Plugin *plugin = s->plugin; | ||
2469 | struct GNUNET_TIME_Relative left; | ||
2470 | |||
2471 | s->timeout_task = NULL; | ||
2472 | left = GNUNET_TIME_absolute_get_remaining (s->timeout); | ||
2473 | if (left.rel_value_us > 0) | ||
2474 | { | ||
2475 | /* not actually our turn yet, but let's at least update | ||
2476 | the monitor, it may think we're about to die ... */ | ||
2477 | notify_session_monitor (s->plugin, s, GNUNET_TRANSPORT_SS_UPDATE); | ||
2478 | s->timeout_task = GNUNET_SCHEDULER_add_delayed (left, &session_timeout, s); | ||
2479 | return; | ||
2480 | } | ||
2481 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2482 | "Session %p was idle for %s, disconnecting\n", | ||
2483 | s, | ||
2484 | GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT, | ||
2485 | GNUNET_YES)); | ||
2486 | /* call session destroy function */ | ||
2487 | udp_disconnect_session (plugin, s); | ||
2488 | } | ||
2489 | |||
2490 | |||
2491 | /** | ||
2492 | * Allocate a new session for the given endpoint address. | ||
2493 | * Note that this function does not inform the service | ||
2494 | * of the new session, this is the responsibility of the | ||
2495 | * caller (if needed). | ||
2496 | * | ||
2497 | * @param cls the `struct Plugin` | ||
2498 | * @param address address of the other peer to use | ||
2499 | * @param network_type network type the address belongs to | ||
2500 | * @return NULL on error, otherwise session handle | ||
2501 | */ | ||
2502 | static struct GNUNET_ATS_Session * | ||
2503 | udp_plugin_create_session (void *cls, | ||
2504 | const struct GNUNET_HELLO_Address *address, | ||
2505 | enum GNUNET_NetworkType network_type) | ||
2506 | { | ||
2507 | struct Plugin *plugin = cls; | ||
2508 | struct GNUNET_ATS_Session *s; | ||
2509 | |||
2510 | s = GNUNET_new (struct GNUNET_ATS_Session); | ||
2511 | s->mst = GNUNET_MST_create (&process_inbound_tokenized_messages, s); | ||
2512 | s->plugin = plugin; | ||
2513 | s->address = GNUNET_HELLO_address_copy (address); | ||
2514 | s->target = address->peer; | ||
2515 | s->last_transmit_time = GNUNET_TIME_absolute_get (); | ||
2516 | s->last_expected_ack_delay = | ||
2517 | GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250); | ||
2518 | s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS; | ||
2519 | s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO; | ||
2520 | s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO; | ||
2521 | s->timeout = GNUNET_TIME_relative_to_absolute (UDP_SESSION_TIME_OUT); | ||
2522 | s->timeout_task = | ||
2523 | GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT, &session_timeout, s); | ||
2524 | s->scope = network_type; | ||
2525 | |||
2526 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2527 | "Creating new session %p for peer `%s' address `%s'\n", | ||
2528 | s, | ||
2529 | GNUNET_i2s (&address->peer), | ||
2530 | udp_address_to_string (plugin, | ||
2531 | address->address, | ||
2532 | address->address_length)); | ||
2533 | GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multipeermap_put ( | ||
2534 | plugin->sessions, | ||
2535 | &s->target, | ||
2536 | s, | ||
2537 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE)); | ||
2538 | GNUNET_STATISTICS_set (plugin->env->stats, | ||
2539 | "# UDP sessions active", | ||
2540 | GNUNET_CONTAINER_multipeermap_size (plugin->sessions), | ||
2541 | GNUNET_NO); | ||
2542 | notify_session_monitor (plugin, s, GNUNET_TRANSPORT_SS_INIT); | ||
2543 | return s; | ||
2544 | } | ||
2545 | |||
2546 | |||
2547 | /** | ||
2548 | * Creates a new outbound session the transport service will use to | ||
2549 | * send data to the peer. | ||
2550 | * | ||
2551 | * @param cls the `struct Plugin *` | ||
2552 | * @param address the address | ||
2553 | * @return the session or NULL of max connections exceeded | ||
2554 | */ | ||
2555 | static struct GNUNET_ATS_Session * | ||
2556 | udp_plugin_get_session (void *cls, const struct GNUNET_HELLO_Address *address) | ||
2557 | { | ||
2558 | struct Plugin *plugin = cls; | ||
2559 | struct GNUNET_ATS_Session *s; | ||
2560 | enum GNUNET_NetworkType network_type = GNUNET_NT_UNSPECIFIED; | ||
2561 | const struct IPv4UdpAddress *udp_v4; | ||
2562 | const struct IPv6UdpAddress *udp_v6; | ||
2563 | |||
2564 | if (NULL == address) | ||
2565 | { | ||
2566 | GNUNET_break (0); | ||
2567 | return NULL; | ||
2568 | } | ||
2569 | if ((address->address_length != sizeof(struct IPv4UdpAddress)) && | ||
2570 | (address->address_length != sizeof(struct IPv6UdpAddress))) | ||
2571 | { | ||
2572 | GNUNET_break_op (0); | ||
2573 | return NULL; | ||
2574 | } | ||
2575 | if (NULL != (s = udp_plugin_lookup_session (cls, address))) | ||
2576 | return s; | ||
2577 | |||
2578 | /* need to create new session */ | ||
2579 | if (sizeof(struct IPv4UdpAddress) == address->address_length) | ||
2580 | { | ||
2581 | struct sockaddr_in v4; | ||
2582 | |||
2583 | udp_v4 = (const struct IPv4UdpAddress *) address->address; | ||
2584 | memset (&v4, '\0', sizeof(v4)); | ||
2585 | v4.sin_family = AF_INET; | ||
2586 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2587 | v4.sin_len = sizeof(struct sockaddr_in); | ||
2588 | #endif | ||
2589 | v4.sin_port = udp_v4->u4_port; | ||
2590 | v4.sin_addr.s_addr = udp_v4->ipv4_addr; | ||
2591 | network_type = plugin->env->get_address_type (plugin->env->cls, | ||
2592 | (const struct sockaddr *) &v4, | ||
2593 | sizeof(v4)); | ||
2594 | } | ||
2595 | if (sizeof(struct IPv6UdpAddress) == address->address_length) | ||
2596 | { | ||
2597 | struct sockaddr_in6 v6; | ||
2598 | |||
2599 | udp_v6 = (const struct IPv6UdpAddress *) address->address; | ||
2600 | memset (&v6, '\0', sizeof(v6)); | ||
2601 | v6.sin6_family = AF_INET6; | ||
2602 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2603 | v6.sin6_len = sizeof(struct sockaddr_in6); | ||
2604 | #endif | ||
2605 | v6.sin6_port = udp_v6->u6_port; | ||
2606 | v6.sin6_addr = udp_v6->ipv6_addr; | ||
2607 | network_type = plugin->env->get_address_type (plugin->env->cls, | ||
2608 | (const struct sockaddr *) &v6, | ||
2609 | sizeof(v6)); | ||
2610 | } | ||
2611 | GNUNET_break (GNUNET_NT_UNSPECIFIED != network_type); | ||
2612 | return udp_plugin_create_session (cls, address, network_type); | ||
2613 | } | ||
2614 | |||
2615 | |||
2616 | /** | ||
2617 | * We've received a UDP Message. Process it (pass contents to main service). | ||
2618 | * | ||
2619 | * @param plugin plugin context | ||
2620 | * @param msg the message | ||
2621 | * @param udp_addr sender address | ||
2622 | * @param udp_addr_len number of bytes in @a udp_addr | ||
2623 | * @param network_type network type the address belongs to | ||
2624 | */ | ||
2625 | static void | ||
2626 | process_udp_message (struct Plugin *plugin, | ||
2627 | const struct UDPMessage *msg, | ||
2628 | const union UdpAddress *udp_addr, | ||
2629 | size_t udp_addr_len, | ||
2630 | enum GNUNET_NetworkType network_type) | ||
2631 | { | ||
2632 | struct GNUNET_ATS_Session *s; | ||
2633 | struct GNUNET_HELLO_Address *address; | ||
2634 | |||
2635 | GNUNET_break (GNUNET_NT_UNSPECIFIED != network_type); | ||
2636 | if (0 != ntohl (msg->reserved)) | ||
2637 | { | ||
2638 | GNUNET_break_op (0); | ||
2639 | return; | ||
2640 | } | ||
2641 | if (ntohs (msg->header.size) < | ||
2642 | sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage)) | ||
2643 | { | ||
2644 | GNUNET_break_op (0); | ||
2645 | return; | ||
2646 | } | ||
2647 | |||
2648 | address = GNUNET_HELLO_address_allocate (&msg->sender, | ||
2649 | PLUGIN_NAME, | ||
2650 | udp_addr, | ||
2651 | udp_addr_len, | ||
2652 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
2653 | if (NULL == (s = udp_plugin_lookup_session (plugin, address))) | ||
2654 | { | ||
2655 | s = udp_plugin_create_session (plugin, address, network_type); | ||
2656 | plugin->env->session_start (plugin->env->cls, address, s, s->scope); | ||
2657 | notify_session_monitor (plugin, s, GNUNET_TRANSPORT_SS_UP); | ||
2658 | } | ||
2659 | GNUNET_free (address); | ||
2660 | |||
2661 | s->rc++; | ||
2662 | GNUNET_MST_from_buffer (s->mst, | ||
2663 | (const char *) &msg[1], | ||
2664 | ntohs (msg->header.size) - sizeof(struct UDPMessage), | ||
2665 | GNUNET_YES, | ||
2666 | GNUNET_NO); | ||
2667 | s->rc--; | ||
2668 | if ((0 == s->rc) && (GNUNET_YES == s->in_destroy)) | ||
2669 | free_session (s); | ||
2670 | } | ||
2671 | |||
2672 | |||
2673 | /** | ||
2674 | * Process a defragmented message. | ||
2675 | * | ||
2676 | * @param cls the `struct DefragContext *` | ||
2677 | * @param msg the message | ||
2678 | */ | ||
2679 | static void | ||
2680 | fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg) | ||
2681 | { | ||
2682 | struct DefragContext *dc = cls; | ||
2683 | const struct UDPMessage *um; | ||
2684 | |||
2685 | if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE) | ||
2686 | { | ||
2687 | GNUNET_break_op (0); | ||
2688 | return; | ||
2689 | } | ||
2690 | if (ntohs (msg->size) < sizeof(struct UDPMessage)) | ||
2691 | { | ||
2692 | GNUNET_break_op (0); | ||
2693 | return; | ||
2694 | } | ||
2695 | um = (const struct UDPMessage *) msg; | ||
2696 | dc->sender = um->sender; | ||
2697 | dc->have_sender = GNUNET_YES; | ||
2698 | process_udp_message (dc->plugin, | ||
2699 | um, | ||
2700 | dc->udp_addr, | ||
2701 | dc->udp_addr_len, | ||
2702 | dc->network_type); | ||
2703 | } | ||
2704 | |||
2705 | |||
2706 | /** | ||
2707 | * We finished sending an acknowledgement. Update | ||
2708 | * statistics. | ||
2709 | * | ||
2710 | * @param cls the `struct Plugin` | ||
2711 | * @param udpw message queue entry of the ACK | ||
2712 | * @param result #GNUNET_OK if the transmission worked, | ||
2713 | * #GNUNET_SYSERR if we failed to send the ACK | ||
2714 | */ | ||
2715 | static void | ||
2716 | ack_message_sent (void *cls, struct UDP_MessageWrapper *udpw, int result) | ||
2717 | { | ||
2718 | struct Plugin *plugin = cls; | ||
2719 | |||
2720 | if (GNUNET_OK == result) | ||
2721 | { | ||
2722 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2723 | "# UDP, ACK messages sent", | ||
2724 | 1, | ||
2725 | GNUNET_NO); | ||
2726 | } | ||
2727 | else | ||
2728 | { | ||
2729 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2730 | "# UDP, ACK transmissions failed", | ||
2731 | 1, | ||
2732 | GNUNET_NO); | ||
2733 | } | ||
2734 | } | ||
2735 | |||
2736 | |||
2737 | /** | ||
2738 | * Transmit an acknowledgement. | ||
2739 | * | ||
2740 | * @param cls the `struct DefragContext *` | ||
2741 | * @param id message ID (unused) | ||
2742 | * @param msg ack to transmit | ||
2743 | */ | ||
2744 | static void | ||
2745 | ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg) | ||
2746 | { | ||
2747 | struct DefragContext *rc = cls; | ||
2748 | struct Plugin *plugin = rc->plugin; | ||
2749 | size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size); | ||
2750 | struct UDP_ACK_Message *udp_ack; | ||
2751 | uint32_t delay; | ||
2752 | struct UDP_MessageWrapper *udpw; | ||
2753 | struct GNUNET_ATS_Session *s; | ||
2754 | struct GNUNET_HELLO_Address *address; | ||
2755 | |||
2756 | if (GNUNET_NO == rc->have_sender) | ||
2757 | { | ||
2758 | /* tried to defragment but never succeeded, hence will not ACK */ | ||
2759 | /* This can happen if we just lost msgs */ | ||
2760 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2761 | "# UDP, fragments discarded without ACK", | ||
2762 | 1, | ||
2763 | GNUNET_NO); | ||
2764 | return; | ||
2765 | } | ||
2766 | address = GNUNET_HELLO_address_allocate (&rc->sender, | ||
2767 | PLUGIN_NAME, | ||
2768 | rc->udp_addr, | ||
2769 | rc->udp_addr_len, | ||
2770 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
2771 | s = udp_plugin_lookup_session (plugin, address); | ||
2772 | GNUNET_HELLO_address_free (address); | ||
2773 | if (NULL == s) | ||
2774 | { | ||
2775 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
2776 | "Trying to transmit ACK to peer `%s' but no session found!\n", | ||
2777 | udp_address_to_string (plugin, rc->udp_addr, rc->udp_addr_len)); | ||
2778 | GNUNET_CONTAINER_heap_remove_node (rc->hnode); | ||
2779 | GNUNET_DEFRAGMENT_context_destroy (rc->defrag); | ||
2780 | GNUNET_free (rc); | ||
2781 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2782 | "# UDP, ACK transmissions failed", | ||
2783 | 1, | ||
2784 | GNUNET_NO); | ||
2785 | return; | ||
2786 | } | ||
2787 | if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == | ||
2788 | s->flow_delay_for_other_peer.rel_value_us) | ||
2789 | delay = UINT32_MAX; | ||
2790 | else if (s->flow_delay_for_other_peer.rel_value_us < UINT32_MAX) | ||
2791 | delay = s->flow_delay_for_other_peer.rel_value_us; | ||
2792 | else | ||
2793 | delay = UINT32_MAX - 1; /* largest value we can communicate */ | ||
2794 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2795 | "Sending ACK to `%s' including delay of %s\n", | ||
2796 | udp_address_to_string (plugin, rc->udp_addr, rc->udp_addr_len), | ||
2797 | GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer, | ||
2798 | GNUNET_YES)); | ||
2799 | udpw = GNUNET_malloc (sizeof(struct UDP_MessageWrapper) + msize); | ||
2800 | udpw->msg_size = msize; | ||
2801 | udpw->payload_size = 0; | ||
2802 | udpw->session = s; | ||
2803 | udpw->start_time = GNUNET_TIME_absolute_get (); | ||
2804 | udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS; | ||
2805 | udpw->msg_buf = (char *) &udpw[1]; | ||
2806 | udpw->qc = &ack_message_sent; | ||
2807 | udpw->qc_cls = plugin; | ||
2808 | udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf; | ||
2809 | udp_ack->header.size = htons ((uint16_t) msize); | ||
2810 | udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK); | ||
2811 | udp_ack->delay = htonl (delay); | ||
2812 | udp_ack->sender = *plugin->env->my_identity; | ||
2813 | GNUNET_memcpy (&udp_ack[1], msg, ntohs (msg->size)); | ||
2814 | enqueue (plugin, udpw); | ||
2815 | notify_session_monitor (plugin, s, GNUNET_TRANSPORT_SS_UPDATE); | ||
2816 | if (s->address->address_length == sizeof(struct IPv4UdpAddress)) | ||
2817 | schedule_select_v4 (plugin); | ||
2818 | else | ||
2819 | schedule_select_v6 (plugin); | ||
2820 | } | ||
2821 | |||
2822 | |||
2823 | /** | ||
2824 | * We received a fragment, process it. | ||
2825 | * | ||
2826 | * @param plugin our plugin | ||
2827 | * @param msg a message of type #GNUNET_MESSAGE_TYPE_FRAGMENT | ||
2828 | * @param udp_addr sender address | ||
2829 | * @param udp_addr_len number of bytes in @a udp_addr | ||
2830 | * @param network_type network type the address belongs to | ||
2831 | */ | ||
2832 | static void | ||
2833 | read_process_fragment (struct Plugin *plugin, | ||
2834 | const struct GNUNET_MessageHeader *msg, | ||
2835 | const union UdpAddress *udp_addr, | ||
2836 | size_t udp_addr_len, | ||
2837 | enum GNUNET_NetworkType network_type) | ||
2838 | { | ||
2839 | struct DefragContext *d_ctx; | ||
2840 | struct GNUNET_TIME_Absolute now; | ||
2841 | struct FindReceiveContext frc; | ||
2842 | |||
2843 | frc.rc = NULL; | ||
2844 | frc.udp_addr = udp_addr; | ||
2845 | frc.udp_addr_len = udp_addr_len; | ||
2846 | |||
2847 | /* Lookup existing receive context for this address */ | ||
2848 | GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs, | ||
2849 | &find_receive_context, | ||
2850 | &frc); | ||
2851 | now = GNUNET_TIME_absolute_get (); | ||
2852 | d_ctx = frc.rc; | ||
2853 | |||
2854 | if (NULL == d_ctx) | ||
2855 | { | ||
2856 | /* Create a new defragmentation context */ | ||
2857 | d_ctx = GNUNET_malloc (sizeof(struct DefragContext) + udp_addr_len); | ||
2858 | GNUNET_memcpy (&d_ctx[1], udp_addr, udp_addr_len); | ||
2859 | d_ctx->udp_addr = (const union UdpAddress *) &d_ctx[1]; | ||
2860 | d_ctx->udp_addr_len = udp_addr_len; | ||
2861 | d_ctx->network_type = network_type; | ||
2862 | d_ctx->plugin = plugin; | ||
2863 | d_ctx->defrag = | ||
2864 | GNUNET_DEFRAGMENT_context_create (plugin->env->stats, | ||
2865 | UDP_MTU, | ||
2866 | UDP_MAX_MESSAGES_IN_DEFRAG, | ||
2867 | d_ctx, | ||
2868 | &fragment_msg_proc, | ||
2869 | &ack_proc); | ||
2870 | d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, | ||
2871 | d_ctx, | ||
2872 | (GNUNET_CONTAINER_HeapCostType) | ||
2873 | now.abs_value_us); | ||
2874 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2875 | "Created new defragmentation context for %u-byte fragment from `%s'\n", | ||
2876 | (unsigned int) ntohs (msg->size), | ||
2877 | udp_address_to_string (plugin, udp_addr, udp_addr_len)); | ||
2878 | } | ||
2879 | else | ||
2880 | { | ||
2881 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2882 | "Found existing defragmentation context for %u-byte fragment from `%s'\n", | ||
2883 | (unsigned int) ntohs (msg->size), | ||
2884 | udp_address_to_string (plugin, udp_addr, udp_addr_len)); | ||
2885 | } | ||
2886 | |||
2887 | if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg)) | ||
2888 | { | ||
2889 | /* keep this 'rc' from expiring */ | ||
2890 | GNUNET_CONTAINER_heap_update_cost (d_ctx->hnode, | ||
2891 | (GNUNET_CONTAINER_HeapCostType) | ||
2892 | now.abs_value_us); | ||
2893 | } | ||
2894 | if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) > | ||
2895 | UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG) | ||
2896 | { | ||
2897 | /* remove 'rc' that was inactive the longest */ | ||
2898 | d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs); | ||
2899 | GNUNET_assert (NULL != d_ctx); | ||
2900 | GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag); | ||
2901 | GNUNET_free (d_ctx); | ||
2902 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2903 | "# UDP, Defragmentations aborted", | ||
2904 | 1, | ||
2905 | GNUNET_NO); | ||
2906 | } | ||
2907 | } | ||
2908 | |||
2909 | |||
2910 | /** | ||
2911 | * Read and process a message from the given socket. | ||
2912 | * | ||
2913 | * @param plugin the overall plugin | ||
2914 | * @param rsock socket to read from | ||
2915 | */ | ||
2916 | static void | ||
2917 | udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock) | ||
2918 | { | ||
2919 | socklen_t fromlen; | ||
2920 | struct sockaddr_storage addr; | ||
2921 | char buf[65536] GNUNET_ALIGN; | ||
2922 | ssize_t size; | ||
2923 | const struct GNUNET_MessageHeader *msg; | ||
2924 | struct IPv4UdpAddress v4; | ||
2925 | struct IPv6UdpAddress v6; | ||
2926 | const struct sockaddr *sa; | ||
2927 | const struct sockaddr_in *sa4; | ||
2928 | const struct sockaddr_in6 *sa6; | ||
2929 | const union UdpAddress *int_addr; | ||
2930 | size_t int_addr_len; | ||
2931 | enum GNUNET_NetworkType network_type; | ||
2932 | |||
2933 | fromlen = sizeof(addr); | ||
2934 | memset (&addr, 0, sizeof(addr)); | ||
2935 | size = GNUNET_NETWORK_socket_recvfrom (rsock, | ||
2936 | buf, | ||
2937 | sizeof(buf), | ||
2938 | (struct sockaddr *) &addr, | ||
2939 | &fromlen); | ||
2940 | sa = (const struct sockaddr *) &addr; | ||
2941 | |||
2942 | if (-1 == size) | ||
2943 | { | ||
2944 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2945 | "UDP failed to receive data: %s\n", | ||
2946 | strerror (errno)); | ||
2947 | /* Connection failure or something. Not a protocol violation. */ | ||
2948 | return; | ||
2949 | } | ||
2950 | |||
2951 | /* Check if this is a STUN packet */ | ||
2952 | if (GNUNET_NO != | ||
2953 | GNUNET_NAT_stun_handle_packet (plugin->nat, | ||
2954 | (const struct sockaddr *) &addr, | ||
2955 | fromlen, | ||
2956 | buf, | ||
2957 | size)) | ||
2958 | return; /* was STUN, do not process further */ | ||
2959 | |||
2960 | if (size < sizeof(struct GNUNET_MessageHeader)) | ||
2961 | { | ||
2962 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2963 | "UDP got %u bytes from %s, which is not enough for a GNUnet message header\n", | ||
2964 | (unsigned int) size, | ||
2965 | GNUNET_a2s (sa, fromlen)); | ||
2966 | /* _MAY_ be a connection failure (got partial message) */ | ||
2967 | /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */ | ||
2968 | GNUNET_break_op (0); | ||
2969 | return; | ||
2970 | } | ||
2971 | |||
2972 | msg = (const struct GNUNET_MessageHeader *) buf; | ||
2973 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2974 | "UDP received %u-byte message from `%s' type %u\n", | ||
2975 | (unsigned int) size, | ||
2976 | GNUNET_a2s (sa, fromlen), | ||
2977 | ntohs (msg->type)); | ||
2978 | if (size != ntohs (msg->size)) | ||
2979 | { | ||
2980 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2981 | "UDP malformed message (size %u) header from %s\n", | ||
2982 | (unsigned int) size, | ||
2983 | GNUNET_a2s (sa, fromlen)); | ||
2984 | GNUNET_break_op (0); | ||
2985 | return; | ||
2986 | } | ||
2987 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2988 | "# UDP, total bytes received", | ||
2989 | size, | ||
2990 | GNUNET_NO); | ||
2991 | network_type = plugin->env->get_address_type (plugin->env->cls, sa, fromlen); | ||
2992 | switch (sa->sa_family) | ||
2993 | { | ||
2994 | case AF_INET: | ||
2995 | sa4 = (const struct sockaddr_in *) &addr; | ||
2996 | v4.options = 0; | ||
2997 | v4.ipv4_addr = sa4->sin_addr.s_addr; | ||
2998 | v4.u4_port = sa4->sin_port; | ||
2999 | int_addr = (union UdpAddress *) &v4; | ||
3000 | int_addr_len = sizeof(v4); | ||
3001 | break; | ||
3002 | |||
3003 | case AF_INET6: | ||
3004 | sa6 = (const struct sockaddr_in6 *) &addr; | ||
3005 | v6.options = 0; | ||
3006 | v6.ipv6_addr = sa6->sin6_addr; | ||
3007 | v6.u6_port = sa6->sin6_port; | ||
3008 | int_addr = (union UdpAddress *) &v6; | ||
3009 | int_addr_len = sizeof(v6); | ||
3010 | break; | ||
3011 | |||
3012 | default: | ||
3013 | GNUNET_break (0); | ||
3014 | return; | ||
3015 | } | ||
3016 | |||
3017 | switch (ntohs (msg->type)) | ||
3018 | { | ||
3019 | case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON: | ||
3020 | if (GNUNET_YES == plugin->enable_broadcasting_receiving) | ||
3021 | udp_broadcast_receive (plugin, | ||
3022 | buf, | ||
3023 | size, | ||
3024 | int_addr, | ||
3025 | int_addr_len, | ||
3026 | network_type); | ||
3027 | return; | ||
3028 | |||
3029 | case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE: | ||
3030 | if (ntohs (msg->size) < sizeof(struct UDPMessage)) | ||
3031 | { | ||
3032 | GNUNET_break_op (0); | ||
3033 | return; | ||
3034 | } | ||
3035 | process_udp_message (plugin, | ||
3036 | (const struct UDPMessage *) msg, | ||
3037 | int_addr, | ||
3038 | int_addr_len, | ||
3039 | network_type); | ||
3040 | return; | ||
3041 | |||
3042 | case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK: | ||
3043 | read_process_ack (plugin, msg, int_addr, int_addr_len); | ||
3044 | return; | ||
3045 | |||
3046 | case GNUNET_MESSAGE_TYPE_FRAGMENT: | ||
3047 | read_process_fragment (plugin, msg, int_addr, int_addr_len, network_type); | ||
3048 | return; | ||
3049 | |||
3050 | default: | ||
3051 | GNUNET_break_op (0); | ||
3052 | return; | ||
3053 | } | ||
3054 | } | ||
3055 | |||
3056 | |||
3057 | /** | ||
3058 | * Removes messages from the transmission queue that have | ||
3059 | * timed out, and then selects a message that should be | ||
3060 | * transmitted next. | ||
3061 | * | ||
3062 | * @param plugin the UDP plugin | ||
3063 | * @param sock which socket should we process the queue for (v4 or v6) | ||
3064 | * @return message selected for transmission, or NULL for none | ||
3065 | */ | ||
3066 | static struct UDP_MessageWrapper * | ||
3067 | remove_timeout_messages_and_select (struct Plugin *plugin, | ||
3068 | struct GNUNET_NETWORK_Handle *sock) | ||
3069 | { | ||
3070 | struct UDP_MessageWrapper *udpw; | ||
3071 | struct GNUNET_TIME_Relative remaining; | ||
3072 | struct GNUNET_ATS_Session *session; | ||
3073 | int removed; | ||
3074 | |||
3075 | removed = GNUNET_NO; | ||
3076 | udpw = (sock == plugin->sockv4) ? plugin->ipv4_queue_head | ||
3077 | : plugin->ipv6_queue_head; | ||
3078 | while (NULL != udpw) | ||
3079 | { | ||
3080 | session = udpw->session; | ||
3081 | /* Find messages with timeout */ | ||
3082 | remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout); | ||
3083 | if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us) | ||
3084 | { | ||
3085 | /* Message timed out */ | ||
3086 | removed = GNUNET_YES; | ||
3087 | dequeue (plugin, udpw); | ||
3088 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
3089 | GNUNET_free (udpw); | ||
3090 | |||
3091 | if (sock == plugin->sockv4) | ||
3092 | { | ||
3093 | udpw = plugin->ipv4_queue_head; | ||
3094 | } | ||
3095 | else if (sock == plugin->sockv6) | ||
3096 | { | ||
3097 | udpw = plugin->ipv6_queue_head; | ||
3098 | } | ||
3099 | else | ||
3100 | { | ||
3101 | GNUNET_break (0); /* should never happen */ | ||
3102 | udpw = NULL; | ||
3103 | } | ||
3104 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3105 | "# messages discarded due to timeout", | ||
3106 | 1, | ||
3107 | GNUNET_NO); | ||
3108 | } | ||
3109 | else | ||
3110 | { | ||
3111 | /* Message did not time out, check transmission time */ | ||
3112 | remaining = GNUNET_TIME_absolute_get_remaining (udpw->transmission_time); | ||
3113 | if (0 == remaining.rel_value_us) | ||
3114 | { | ||
3115 | /* this message is not delayed */ | ||
3116 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3117 | "Message for peer `%s' (%lu bytes) is not delayed \n", | ||
3118 | GNUNET_i2s (&udpw->session->target), | ||
3119 | (unsigned long) udpw->payload_size); | ||
3120 | break; /* Found message to send, break */ | ||
3121 | } | ||
3122 | else | ||
3123 | { | ||
3124 | /* Message is delayed, try next */ | ||
3125 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3126 | "Message for peer `%s' (%lu bytes) is delayed for %s\n", | ||
3127 | GNUNET_i2s (&udpw->session->target), | ||
3128 | (unsigned long) udpw->payload_size, | ||
3129 | GNUNET_STRINGS_relative_time_to_string (remaining, GNUNET_YES)); | ||
3130 | udpw = udpw->next; | ||
3131 | } | ||
3132 | } | ||
3133 | } | ||
3134 | if (GNUNET_YES == removed) | ||
3135 | notify_session_monitor (session->plugin, | ||
3136 | session, | ||
3137 | GNUNET_TRANSPORT_SS_UPDATE); | ||
3138 | return udpw; | ||
3139 | } | ||
3140 | |||
3141 | |||
3142 | /** | ||
3143 | * We failed to transmit a message via UDP. Generate | ||
3144 | * a descriptive error message. | ||
3145 | * | ||
3146 | * @param plugin our plugin | ||
3147 | * @param sa target address we were trying to reach | ||
3148 | * @param slen number of bytes in @a sa | ||
3149 | * @param error the errno value returned from the sendto() call | ||
3150 | */ | ||
3151 | static void | ||
3152 | analyze_send_error (struct Plugin *plugin, | ||
3153 | const struct sockaddr *sa, | ||
3154 | socklen_t slen, | ||
3155 | int error) | ||
3156 | { | ||
3157 | enum GNUNET_NetworkType type; | ||
3158 | |||
3159 | type = plugin->env->get_address_type (plugin->env->cls, sa, slen); | ||
3160 | if (((GNUNET_NT_LAN == type) || (GNUNET_NT_WAN == type)) && | ||
3161 | ((ENETUNREACH == errno) || (ENETDOWN == errno))) | ||
3162 | { | ||
3163 | if (slen == sizeof(struct sockaddr_in)) | ||
3164 | { | ||
3165 | /* IPv4: "Network unreachable" or "Network down" | ||
3166 | * | ||
3167 | * This indicates we do not have connectivity | ||
3168 | */ | ||
3169 | LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, | ||
3170 | _ ("UDP could not transmit message to `%s': " | ||
3171 | "Network seems down, please check your network configuration\n"), | ||
3172 | GNUNET_a2s (sa, slen)); | ||
3173 | } | ||
3174 | if (slen == sizeof(struct sockaddr_in6)) | ||
3175 | { | ||
3176 | /* IPv6: "Network unreachable" or "Network down" | ||
3177 | * | ||
3178 | * This indicates that this system is IPv6 enabled, but does not | ||
3179 | * have a valid global IPv6 address assigned or we do not have | ||
3180 | * connectivity | ||
3181 | */LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, | ||
3182 | _ ( | ||
3183 | "UDP could not transmit IPv6 message! " | ||
3184 | "Please check your network configuration and disable IPv6 if your " | ||
3185 | "connection does not have a global IPv6 address\n")); | ||
3186 | } | ||
3187 | } | ||
3188 | else | ||
3189 | { | ||
3190 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
3191 | "UDP could not transmit message to `%s': `%s'\n", | ||
3192 | GNUNET_a2s (sa, slen), | ||
3193 | strerror (error)); | ||
3194 | } | ||
3195 | } | ||
3196 | |||
3197 | |||
3198 | /** | ||
3199 | * It is time to try to transmit a UDP message. Select one | ||
3200 | * and send. | ||
3201 | * | ||
3202 | * @param plugin the plugin | ||
3203 | * @param sock which socket (v4/v6) to send on | ||
3204 | */ | ||
3205 | static void | ||
3206 | udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock) | ||
3207 | { | ||
3208 | ssize_t sent; | ||
3209 | socklen_t slen; | ||
3210 | const struct sockaddr *a; | ||
3211 | const struct IPv4UdpAddress *u4; | ||
3212 | struct sockaddr_in a4; | ||
3213 | const struct IPv6UdpAddress *u6; | ||
3214 | struct sockaddr_in6 a6; | ||
3215 | struct UDP_MessageWrapper *udpw; | ||
3216 | |||
3217 | /* Find message(s) to send */ | ||
3218 | while (NULL != (udpw = remove_timeout_messages_and_select (plugin, sock))) | ||
3219 | { | ||
3220 | if (sizeof(struct IPv4UdpAddress) == | ||
3221 | udpw->session->address->address_length) | ||
3222 | { | ||
3223 | u4 = udpw->session->address->address; | ||
3224 | memset (&a4, 0, sizeof(a4)); | ||
3225 | a4.sin_family = AF_INET; | ||
3226 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3227 | a4.sin_len = sizeof(a4); | ||
3228 | #endif | ||
3229 | a4.sin_port = u4->u4_port; | ||
3230 | a4.sin_addr.s_addr = u4->ipv4_addr; | ||
3231 | a = (const struct sockaddr *) &a4; | ||
3232 | slen = sizeof(a4); | ||
3233 | } | ||
3234 | else if (sizeof(struct IPv6UdpAddress) == | ||
3235 | udpw->session->address->address_length) | ||
3236 | { | ||
3237 | u6 = udpw->session->address->address; | ||
3238 | memset (&a6, 0, sizeof(a6)); | ||
3239 | a6.sin6_family = AF_INET6; | ||
3240 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3241 | a6.sin6_len = sizeof(a6); | ||
3242 | #endif | ||
3243 | a6.sin6_port = u6->u6_port; | ||
3244 | a6.sin6_addr = u6->ipv6_addr; | ||
3245 | a = (const struct sockaddr *) &a6; | ||
3246 | slen = sizeof(a6); | ||
3247 | } | ||
3248 | else | ||
3249 | { | ||
3250 | GNUNET_break (0); | ||
3251 | dequeue (plugin, udpw); | ||
3252 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
3253 | notify_session_monitor (plugin, | ||
3254 | udpw->session, | ||
3255 | GNUNET_TRANSPORT_SS_UPDATE); | ||
3256 | GNUNET_free (udpw); | ||
3257 | continue; | ||
3258 | } | ||
3259 | sent = GNUNET_NETWORK_socket_sendto (sock, | ||
3260 | udpw->msg_buf, | ||
3261 | udpw->msg_size, | ||
3262 | a, | ||
3263 | slen); | ||
3264 | udpw->session->last_transmit_time = | ||
3265 | GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (), | ||
3266 | udpw->session->last_transmit_time); | ||
3267 | dequeue (plugin, udpw); | ||
3268 | if (GNUNET_SYSERR == sent) | ||
3269 | { | ||
3270 | /* Failure */ | ||
3271 | analyze_send_error (plugin, a, slen, errno); | ||
3272 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
3273 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3274 | "# UDP, total, bytes, sent, failure", | ||
3275 | sent, | ||
3276 | GNUNET_NO); | ||
3277 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3278 | "# UDP, total, messages, sent, failure", | ||
3279 | 1, | ||
3280 | GNUNET_NO); | ||
3281 | } | ||
3282 | else | ||
3283 | { | ||
3284 | /* Success */ | ||
3285 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3286 | "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n", | ||
3287 | (unsigned int) (udpw->msg_size), | ||
3288 | GNUNET_i2s (&udpw->session->target), | ||
3289 | GNUNET_a2s (a, slen), | ||
3290 | (int) sent, | ||
3291 | (sent < 0) ? strerror (errno) : "ok"); | ||
3292 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3293 | "# UDP, total, bytes, sent, success", | ||
3294 | sent, | ||
3295 | GNUNET_NO); | ||
3296 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3297 | "# UDP, total, messages, sent, success", | ||
3298 | 1, | ||
3299 | GNUNET_NO); | ||
3300 | if (NULL != udpw->frag_ctx) | ||
3301 | udpw->frag_ctx->on_wire_size += udpw->msg_size; | ||
3302 | udpw->qc (udpw->qc_cls, udpw, GNUNET_OK); | ||
3303 | } | ||
3304 | notify_session_monitor (plugin, udpw->session, GNUNET_TRANSPORT_SS_UPDATE); | ||
3305 | GNUNET_free (udpw); | ||
3306 | } | ||
3307 | } | ||
3308 | |||
3309 | |||
3310 | /* ***************** Event loop (part 2) *************** */ | ||
3311 | |||
3312 | |||
3313 | /** | ||
3314 | * We have been notified that our readset has something to read. We don't | ||
3315 | * know which socket needs to be read, so we have to check each one | ||
3316 | * Then reschedule this function to be called again once more is available. | ||
3317 | * | ||
3318 | * @param cls the plugin handle | ||
3319 | */ | ||
3320 | static void | ||
3321 | udp_plugin_select_v4 (void *cls) | ||
3322 | { | ||
3323 | struct Plugin *plugin = cls; | ||
3324 | const struct GNUNET_SCHEDULER_TaskContext *tc; | ||
3325 | |||
3326 | plugin->select_task_v4 = NULL; | ||
3327 | if (NULL == plugin->sockv4) | ||
3328 | return; | ||
3329 | tc = GNUNET_SCHEDULER_get_task_context (); | ||
3330 | if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) && | ||
3331 | (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4))) | ||
3332 | udp_select_read (plugin, plugin->sockv4); | ||
3333 | udp_select_send (plugin, plugin->sockv4); | ||
3334 | schedule_select_v4 (plugin); | ||
3335 | } | ||
3336 | |||
3337 | |||
3338 | /** | ||
3339 | * We have been notified that our readset has something to read. We don't | ||
3340 | * know which socket needs to be read, so we have to check each one | ||
3341 | * Then reschedule this function to be called again once more is available. | ||
3342 | * | ||
3343 | * @param cls the plugin handle | ||
3344 | */ | ||
3345 | static void | ||
3346 | udp_plugin_select_v6 (void *cls) | ||
3347 | { | ||
3348 | struct Plugin *plugin = cls; | ||
3349 | const struct GNUNET_SCHEDULER_TaskContext *tc; | ||
3350 | |||
3351 | plugin->select_task_v6 = NULL; | ||
3352 | if (NULL == plugin->sockv6) | ||
3353 | return; | ||
3354 | tc = GNUNET_SCHEDULER_get_task_context (); | ||
3355 | if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) && | ||
3356 | (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6))) | ||
3357 | udp_select_read (plugin, plugin->sockv6); | ||
3358 | |||
3359 | udp_select_send (plugin, plugin->sockv6); | ||
3360 | schedule_select_v6 (plugin); | ||
3361 | } | ||
3362 | |||
3363 | |||
3364 | /* ******************* Initialization *************** */ | ||
3365 | |||
3366 | |||
3367 | /** | ||
3368 | * Setup the UDP sockets (for IPv4 and IPv6) for the plugin. | ||
3369 | * | ||
3370 | * @param plugin the plugin to initialize | ||
3371 | * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any') | ||
3372 | * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any') | ||
3373 | * @return number of sockets that were successfully bound | ||
3374 | */ | ||
3375 | static unsigned int | ||
3376 | setup_sockets (struct Plugin *plugin, | ||
3377 | const struct sockaddr_in6 *bind_v6, | ||
3378 | const struct sockaddr_in *bind_v4) | ||
3379 | { | ||
3380 | int tries; | ||
3381 | unsigned int sockets_created = 0; | ||
3382 | struct sockaddr_in6 server_addrv6; | ||
3383 | struct sockaddr_in server_addrv4; | ||
3384 | const struct sockaddr *server_addr; | ||
3385 | const struct sockaddr *addrs[2]; | ||
3386 | socklen_t addrlens[2]; | ||
3387 | socklen_t addrlen; | ||
3388 | int eno; | ||
3389 | |||
3390 | /* Create IPv6 socket */ | ||
3391 | eno = EINVAL; | ||
3392 | if (GNUNET_YES == plugin->enable_ipv6) | ||
3393 | { | ||
3394 | plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0); | ||
3395 | if (NULL == plugin->sockv6) | ||
3396 | { | ||
3397 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
3398 | _ ("Disabling IPv6 since it is not supported on this system!\n")); | ||
3399 | plugin->enable_ipv6 = GNUNET_NO; | ||
3400 | } | ||
3401 | else | ||
3402 | { | ||
3403 | memset (&server_addrv6, 0, sizeof(struct sockaddr_in6)); | ||
3404 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3405 | server_addrv6.sin6_len = sizeof(struct sockaddr_in6); | ||
3406 | #endif | ||
3407 | server_addrv6.sin6_family = AF_INET6; | ||
3408 | if (NULL != bind_v6) | ||
3409 | server_addrv6.sin6_addr = bind_v6->sin6_addr; | ||
3410 | else | ||
3411 | server_addrv6.sin6_addr = in6addr_any; | ||
3412 | |||
3413 | if (0 == plugin->port) /* autodetect */ | ||
3414 | server_addrv6.sin6_port = htons ( | ||
3415 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) | ||
3416 | + 32000); | ||
3417 | else | ||
3418 | server_addrv6.sin6_port = htons (plugin->port); | ||
3419 | addrlen = sizeof(struct sockaddr_in6); | ||
3420 | server_addr = (const struct sockaddr *) &server_addrv6; | ||
3421 | |||
3422 | tries = 0; | ||
3423 | while (tries < 10) | ||
3424 | { | ||
3425 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3426 | "Binding to IPv6 `%s'\n", | ||
3427 | GNUNET_a2s (server_addr, addrlen)); | ||
3428 | /* binding */ | ||
3429 | if (GNUNET_OK == | ||
3430 | GNUNET_NETWORK_socket_bind (plugin->sockv6, server_addr, addrlen)) | ||
3431 | break; | ||
3432 | eno = errno; | ||
3433 | if (0 != plugin->port) | ||
3434 | { | ||
3435 | tries = 10; /* fail immediately */ | ||
3436 | break; /* bind failed on specific port */ | ||
3437 | } | ||
3438 | /* autodetect */ | ||
3439 | server_addrv6.sin6_port = htons ( | ||
3440 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) | ||
3441 | + 32000); | ||
3442 | tries++; | ||
3443 | } | ||
3444 | if (tries >= 10) | ||
3445 | { | ||
3446 | GNUNET_NETWORK_socket_close (plugin->sockv6); | ||
3447 | plugin->enable_ipv6 = GNUNET_NO; | ||
3448 | plugin->sockv6 = NULL; | ||
3449 | } | ||
3450 | else | ||
3451 | { | ||
3452 | plugin->port = ntohs (server_addrv6.sin6_port); | ||
3453 | } | ||
3454 | if (NULL != plugin->sockv6) | ||
3455 | { | ||
3456 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3457 | "IPv6 UDP socket created listinging at %s\n", | ||
3458 | GNUNET_a2s (server_addr, addrlen)); | ||
3459 | addrs[sockets_created] = server_addr; | ||
3460 | addrlens[sockets_created] = addrlen; | ||
3461 | sockets_created++; | ||
3462 | } | ||
3463 | else | ||
3464 | { | ||
3465 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
3466 | _ ("Failed to bind UDP socket to %s: %s\n"), | ||
3467 | GNUNET_a2s (server_addr, addrlen), | ||
3468 | strerror (eno)); | ||
3469 | } | ||
3470 | } | ||
3471 | } | ||
3472 | |||
3473 | /* Create IPv4 socket */ | ||
3474 | eno = EINVAL; | ||
3475 | plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0); | ||
3476 | if (NULL == plugin->sockv4) | ||
3477 | { | ||
3478 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket"); | ||
3479 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
3480 | _ ("Disabling IPv4 since it is not supported on this system!\n")); | ||
3481 | plugin->enable_ipv4 = GNUNET_NO; | ||
3482 | } | ||
3483 | else | ||
3484 | { | ||
3485 | memset (&server_addrv4, 0, sizeof(struct sockaddr_in)); | ||
3486 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3487 | server_addrv4.sin_len = sizeof(struct sockaddr_in); | ||
3488 | #endif | ||
3489 | server_addrv4.sin_family = AF_INET; | ||
3490 | if (NULL != bind_v4) | ||
3491 | server_addrv4.sin_addr = bind_v4->sin_addr; | ||
3492 | else | ||
3493 | server_addrv4.sin_addr.s_addr = INADDR_ANY; | ||
3494 | |||
3495 | if (0 == plugin->port) | ||
3496 | /* autodetect */ | ||
3497 | server_addrv4.sin_port = htons ( | ||
3498 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); | ||
3499 | else | ||
3500 | server_addrv4.sin_port = htons (plugin->port); | ||
3501 | |||
3502 | addrlen = sizeof(struct sockaddr_in); | ||
3503 | server_addr = (const struct sockaddr *) &server_addrv4; | ||
3504 | |||
3505 | tries = 0; | ||
3506 | while (tries < 10) | ||
3507 | { | ||
3508 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3509 | "Binding to IPv4 `%s'\n", | ||
3510 | GNUNET_a2s (server_addr, addrlen)); | ||
3511 | |||
3512 | /* binding */ | ||
3513 | if (GNUNET_OK == | ||
3514 | GNUNET_NETWORK_socket_bind (plugin->sockv4, server_addr, addrlen)) | ||
3515 | break; | ||
3516 | eno = errno; | ||
3517 | if (0 != plugin->port) | ||
3518 | { | ||
3519 | tries = 10; /* fail */ | ||
3520 | break; /* bind failed on specific port */ | ||
3521 | } | ||
3522 | |||
3523 | /* autodetect */ | ||
3524 | server_addrv4.sin_port = htons ( | ||
3525 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); | ||
3526 | tries++; | ||
3527 | } | ||
3528 | if (tries >= 10) | ||
3529 | { | ||
3530 | GNUNET_NETWORK_socket_close (plugin->sockv4); | ||
3531 | plugin->enable_ipv4 = GNUNET_NO; | ||
3532 | plugin->sockv4 = NULL; | ||
3533 | } | ||
3534 | else | ||
3535 | { | ||
3536 | plugin->port = ntohs (server_addrv4.sin_port); | ||
3537 | } | ||
3538 | |||
3539 | if (NULL != plugin->sockv4) | ||
3540 | { | ||
3541 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3542 | "IPv4 socket created on port %s\n", | ||
3543 | GNUNET_a2s (server_addr, addrlen)); | ||
3544 | addrs[sockets_created] = server_addr; | ||
3545 | addrlens[sockets_created] = addrlen; | ||
3546 | sockets_created++; | ||
3547 | } | ||
3548 | else | ||
3549 | { | ||
3550 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
3551 | _ ("Failed to bind UDP socket to %s: %s\n"), | ||
3552 | GNUNET_a2s (server_addr, addrlen), | ||
3553 | strerror (eno)); | ||
3554 | } | ||
3555 | } | ||
3556 | |||
3557 | if (0 == sockets_created) | ||
3558 | { | ||
3559 | LOG (GNUNET_ERROR_TYPE_WARNING, _ ("Failed to open UDP sockets\n")); | ||
3560 | return 0; /* No sockets created, return */ | ||
3561 | } | ||
3562 | schedule_select_v4 (plugin); | ||
3563 | schedule_select_v6 (plugin); | ||
3564 | plugin->nat = GNUNET_NAT_register (plugin->env->cfg, | ||
3565 | "transport-udp", | ||
3566 | IPPROTO_UDP, | ||
3567 | sockets_created, | ||
3568 | addrs, | ||
3569 | addrlens, | ||
3570 | &udp_nat_port_map_callback, | ||
3571 | NULL, | ||
3572 | plugin); | ||
3573 | return sockets_created; | ||
3574 | } | ||
3575 | |||
3576 | |||
3577 | /** | ||
3578 | * The exported method. Makes the core api available via a global and | ||
3579 | * returns the udp transport API. | ||
3580 | * | ||
3581 | * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment` | ||
3582 | * @return our `struct GNUNET_TRANSPORT_PluginFunctions` | ||
3583 | */ | ||
3584 | void * | ||
3585 | libgnunet_plugin_transport_udp_init (void *cls) | ||
3586 | { | ||
3587 | struct GNUNET_TRANSPORT_PluginEnvironment *env = cls; | ||
3588 | struct GNUNET_TRANSPORT_PluginFunctions *api; | ||
3589 | struct Plugin *p; | ||
3590 | unsigned long long port; | ||
3591 | unsigned long long aport; | ||
3592 | unsigned long long udp_max_bps; | ||
3593 | int enable_v6; | ||
3594 | int enable_broadcasting; | ||
3595 | int enable_broadcasting_recv; | ||
3596 | char *bind4_address; | ||
3597 | char *bind6_address; | ||
3598 | struct GNUNET_TIME_Relative interval; | ||
3599 | struct sockaddr_in server_addrv4; | ||
3600 | struct sockaddr_in6 server_addrv6; | ||
3601 | unsigned int res; | ||
3602 | int have_bind4; | ||
3603 | int have_bind6; | ||
3604 | |||
3605 | if (NULL == env->receive) | ||
3606 | { | ||
3607 | /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully | ||
3608 | initialize the plugin or the API */ | ||
3609 | api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions); | ||
3610 | api->cls = NULL; | ||
3611 | api->address_pretty_printer = &udp_plugin_address_pretty_printer; | ||
3612 | api->address_to_string = &udp_address_to_string; | ||
3613 | api->string_to_address = &udp_string_to_address; | ||
3614 | return api; | ||
3615 | } | ||
3616 | |||
3617 | /* Get port number: port == 0 : autodetect a port, | ||
3618 | * > 0 : use this port, not given : 2086 default */ | ||
3619 | if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3620 | "transport-udp", | ||
3621 | "PORT", | ||
3622 | &port)) | ||
3623 | port = 2086; | ||
3624 | if (port > 65535) | ||
3625 | { | ||
3626 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
3627 | "transport-udp", | ||
3628 | "PORT", | ||
3629 | _ ("must be in [0,65535]")); | ||
3630 | return NULL; | ||
3631 | } | ||
3632 | if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3633 | "transport-udp", | ||
3634 | "ADVERTISED_PORT", | ||
3635 | &aport)) | ||
3636 | aport = port; | ||
3637 | if (aport > 65535) | ||
3638 | { | ||
3639 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
3640 | "transport-udp", | ||
3641 | "ADVERTISED_PORT", | ||
3642 | _ ("must be in [0,65535]")); | ||
3643 | return NULL; | ||
3644 | } | ||
3645 | |||
3646 | if (GNUNET_YES == | ||
3647 | GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat", "DISABLEV6")) | ||
3648 | enable_v6 = GNUNET_NO; | ||
3649 | else | ||
3650 | enable_v6 = GNUNET_YES; | ||
3651 | |||
3652 | have_bind4 = GNUNET_NO; | ||
3653 | memset (&server_addrv4, 0, sizeof(server_addrv4)); | ||
3654 | if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (env->cfg, | ||
3655 | "transport-udp", | ||
3656 | "BINDTO", | ||
3657 | &bind4_address)) | ||
3658 | { | ||
3659 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3660 | "Binding UDP plugin to specific address: `%s'\n", | ||
3661 | bind4_address); | ||
3662 | if (1 != inet_pton (AF_INET, bind4_address, &server_addrv4.sin_addr)) | ||
3663 | { | ||
3664 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
3665 | "transport-udp", | ||
3666 | "BINDTO", | ||
3667 | _ ("must be valid IPv4 address")); | ||
3668 | GNUNET_free (bind4_address); | ||
3669 | return NULL; | ||
3670 | } | ||
3671 | have_bind4 = GNUNET_YES; | ||
3672 | } | ||
3673 | GNUNET_free (bind4_address); | ||
3674 | have_bind6 = GNUNET_NO; | ||
3675 | memset (&server_addrv6, 0, sizeof(server_addrv6)); | ||
3676 | if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (env->cfg, | ||
3677 | "transport-udp", | ||
3678 | "BINDTO6", | ||
3679 | &bind6_address)) | ||
3680 | { | ||
3681 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3682 | "Binding udp plugin to specific address: `%s'\n", | ||
3683 | bind6_address); | ||
3684 | if (1 != inet_pton (AF_INET6, bind6_address, &server_addrv6.sin6_addr)) | ||
3685 | { | ||
3686 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
3687 | "transport-udp", | ||
3688 | "BINDTO6", | ||
3689 | _ ("must be valid IPv6 address")); | ||
3690 | GNUNET_free (bind6_address); | ||
3691 | return NULL; | ||
3692 | } | ||
3693 | have_bind6 = GNUNET_YES; | ||
3694 | } | ||
3695 | GNUNET_free (bind6_address); | ||
3696 | |||
3697 | enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, | ||
3698 | "transport-udp", | ||
3699 | "BROADCAST"); | ||
3700 | if (enable_broadcasting == GNUNET_SYSERR) | ||
3701 | enable_broadcasting = GNUNET_NO; | ||
3702 | |||
3703 | enable_broadcasting_recv = | ||
3704 | GNUNET_CONFIGURATION_get_value_yesno (env->cfg, | ||
3705 | "transport-udp", | ||
3706 | "BROADCAST_RECEIVE"); | ||
3707 | if (enable_broadcasting_recv == GNUNET_SYSERR) | ||
3708 | enable_broadcasting_recv = GNUNET_YES; | ||
3709 | |||
3710 | if (GNUNET_SYSERR == | ||
3711 | GNUNET_CONFIGURATION_get_value_time (env->cfg, | ||
3712 | "transport-udp", | ||
3713 | "BROADCAST_INTERVAL", | ||
3714 | &interval)) | ||
3715 | { | ||
3716 | interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10); | ||
3717 | } | ||
3718 | if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3719 | "transport-udp", | ||
3720 | "MAX_BPS", | ||
3721 | &udp_max_bps)) | ||
3722 | { | ||
3723 | /* 50 MB/s == infinity for practical purposes */ | ||
3724 | udp_max_bps = 1024 * 1024 * 50; | ||
3725 | } | ||
3726 | |||
3727 | p = GNUNET_new (struct Plugin); | ||
3728 | p->port = port; | ||
3729 | p->aport = aport; | ||
3730 | p->broadcast_interval = interval; | ||
3731 | p->enable_ipv6 = enable_v6; | ||
3732 | p->enable_ipv4 = GNUNET_YES; /* default */ | ||
3733 | p->enable_broadcasting = enable_broadcasting; | ||
3734 | p->enable_broadcasting_receiving = enable_broadcasting_recv; | ||
3735 | p->env = env; | ||
3736 | p->sessions = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_NO); | ||
3737 | p->defrag_ctxs = | ||
3738 | GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN); | ||
3739 | GNUNET_BANDWIDTH_tracker_init (&p->tracker, | ||
3740 | NULL, | ||
3741 | NULL, | ||
3742 | GNUNET_BANDWIDTH_value_init ( | ||
3743 | (uint32_t) udp_max_bps), | ||
3744 | 30); | ||
3745 | res = setup_sockets (p, | ||
3746 | (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL, | ||
3747 | (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL); | ||
3748 | if ((0 == res) || ((NULL == p->sockv4) && (NULL == p->sockv6))) | ||
3749 | { | ||
3750 | LOG (GNUNET_ERROR_TYPE_ERROR, _ ("Failed to create UDP network sockets\n")); | ||
3751 | GNUNET_CONTAINER_multipeermap_destroy (p->sessions); | ||
3752 | GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs); | ||
3753 | if (NULL != p->nat) | ||
3754 | GNUNET_NAT_unregister (p->nat); | ||
3755 | GNUNET_free (p); | ||
3756 | return NULL; | ||
3757 | } | ||
3758 | |||
3759 | /* Setup broadcasting and receiving beacons */ | ||
3760 | setup_broadcast (p, &server_addrv6, &server_addrv4); | ||
3761 | |||
3762 | api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions); | ||
3763 | api->cls = p; | ||
3764 | api->disconnect_session = &udp_disconnect_session; | ||
3765 | api->query_keepalive_factor = &udp_query_keepalive_factor; | ||
3766 | api->disconnect_peer = &udp_disconnect; | ||
3767 | api->address_pretty_printer = &udp_plugin_address_pretty_printer; | ||
3768 | api->address_to_string = &udp_address_to_string; | ||
3769 | api->string_to_address = &udp_string_to_address; | ||
3770 | api->check_address = &udp_plugin_check_address; | ||
3771 | api->get_session = &udp_plugin_get_session; | ||
3772 | api->send = &udp_plugin_send; | ||
3773 | api->get_network = &udp_plugin_get_network; | ||
3774 | api->get_network_for_address = &udp_plugin_get_network_for_address; | ||
3775 | api->update_session_timeout = &udp_plugin_update_session_timeout; | ||
3776 | api->setup_monitor = &udp_plugin_setup_monitor; | ||
3777 | return api; | ||
3778 | } | ||
3779 | |||
3780 | |||
3781 | /** | ||
3782 | * Function called on each entry in the defragmentation heap to | ||
3783 | * clean it up. | ||
3784 | * | ||
3785 | * @param cls NULL | ||
3786 | * @param node node in the heap (to be removed) | ||
3787 | * @param element a `struct DefragContext` to be cleaned up | ||
3788 | * @param cost unused | ||
3789 | * @return #GNUNET_YES | ||
3790 | */ | ||
3791 | static int | ||
3792 | heap_cleanup_iterator (void *cls, | ||
3793 | struct GNUNET_CONTAINER_HeapNode *node, | ||
3794 | void *element, | ||
3795 | GNUNET_CONTAINER_HeapCostType cost) | ||
3796 | { | ||
3797 | struct DefragContext *d_ctx = element; | ||
3798 | |||
3799 | GNUNET_CONTAINER_heap_remove_node (node); | ||
3800 | GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag); | ||
3801 | GNUNET_free (d_ctx); | ||
3802 | return GNUNET_YES; | ||
3803 | } | ||
3804 | |||
3805 | |||
3806 | /** | ||
3807 | * The exported method. Makes the core api available via a global and | ||
3808 | * returns the udp transport API. | ||
3809 | * | ||
3810 | * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment` | ||
3811 | * @return NULL | ||
3812 | */ | ||
3813 | void * | ||
3814 | libgnunet_plugin_transport_udp_done (void *cls) | ||
3815 | { | ||
3816 | struct GNUNET_TRANSPORT_PluginFunctions *api = cls; | ||
3817 | struct Plugin *plugin = api->cls; | ||
3818 | struct PrettyPrinterContext *cur; | ||
3819 | struct UDP_MessageWrapper *udpw; | ||
3820 | |||
3821 | if (NULL == plugin) | ||
3822 | { | ||
3823 | GNUNET_free (api); | ||
3824 | return NULL; | ||
3825 | } | ||
3826 | stop_broadcast (plugin); | ||
3827 | if (NULL != plugin->select_task_v4) | ||
3828 | { | ||
3829 | GNUNET_SCHEDULER_cancel (plugin->select_task_v4); | ||
3830 | plugin->select_task_v4 = NULL; | ||
3831 | } | ||
3832 | if (NULL != plugin->select_task_v6) | ||
3833 | { | ||
3834 | GNUNET_SCHEDULER_cancel (plugin->select_task_v6); | ||
3835 | plugin->select_task_v6 = NULL; | ||
3836 | } | ||
3837 | if (NULL != plugin->sockv4) | ||
3838 | { | ||
3839 | GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4)); | ||
3840 | plugin->sockv4 = NULL; | ||
3841 | } | ||
3842 | if (NULL != plugin->sockv6) | ||
3843 | { | ||
3844 | GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6)); | ||
3845 | plugin->sockv6 = NULL; | ||
3846 | } | ||
3847 | if (NULL != plugin->nat) | ||
3848 | { | ||
3849 | GNUNET_NAT_unregister (plugin->nat); | ||
3850 | plugin->nat = NULL; | ||
3851 | } | ||
3852 | if (NULL != plugin->defrag_ctxs) | ||
3853 | { | ||
3854 | GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs, | ||
3855 | &heap_cleanup_iterator, | ||
3856 | NULL); | ||
3857 | GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs); | ||
3858 | plugin->defrag_ctxs = NULL; | ||
3859 | } | ||
3860 | while (NULL != (udpw = plugin->ipv4_queue_head)) | ||
3861 | { | ||
3862 | dequeue (plugin, udpw); | ||
3863 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
3864 | GNUNET_free (udpw); | ||
3865 | } | ||
3866 | while (NULL != (udpw = plugin->ipv6_queue_head)) | ||
3867 | { | ||
3868 | dequeue (plugin, udpw); | ||
3869 | udpw->qc (udpw->qc_cls, udpw, GNUNET_SYSERR); | ||
3870 | GNUNET_free (udpw); | ||
3871 | } | ||
3872 | GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions, | ||
3873 | &disconnect_and_free_it, | ||
3874 | plugin); | ||
3875 | GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions); | ||
3876 | |||
3877 | while (NULL != (cur = plugin->ppc_dll_head)) | ||
3878 | { | ||
3879 | GNUNET_break (0); | ||
3880 | GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head, | ||
3881 | plugin->ppc_dll_tail, | ||
3882 | cur); | ||
3883 | GNUNET_RESOLVER_request_cancel (cur->resolver_handle); | ||
3884 | if (NULL != cur->timeout_task) | ||
3885 | { | ||
3886 | GNUNET_SCHEDULER_cancel (cur->timeout_task); | ||
3887 | cur->timeout_task = NULL; | ||
3888 | } | ||
3889 | GNUNET_free (cur); | ||
3890 | } | ||
3891 | GNUNET_free (plugin); | ||
3892 | GNUNET_free (api); | ||
3893 | return NULL; | ||
3894 | } | ||
3895 | |||
3896 | |||
3897 | /* end of plugin_transport_udp.c */ | ||