source: mainline/uspace/srv/net/tl/udp/udp.c@ aa85487

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since aa85487 was aa85487, checked in by Lukas Mejdrech <lukasmejdrech@…>, 16 years ago

Merge mainline changes, revision 308
  • Property mode set to 100644
File size: 24.6 KB
Line 
1/*
2 * Copyright (c) 2008 Lukas Mejdrech
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup udp
30 * @{
31 */
32
33/** @file
34 * UDP module implementation.
35 * @see udp.h
36 */
37
38#include <async.h>
39#include <fibril_synch.h>
40#include <malloc.h>
41#include <stdio.h>
42
43#include <ipc/ipc.h>
44#include <ipc/services.h>
45
46#include "../../err.h"
47#include "../../messages.h"
48#include "../../modules.h"
49
50#include "../../structures/dynamic_fifo.h"
51#include "../../structures/packet/packet_client.h"
52
53#include "../../include/checksum.h"
54#include "../../include/in.h"
55#include "../../include/in6.h"
56#include "../../include/inet.h"
57#include "../../include/ip_client.h"
58#include "../../include/ip_interface.h"
59#include "../../include/ip_protocols.h"
60#include "../../include/icmp_client.h"
61#include "../../include/icmp_interface.h"
62#include "../../include/net_interface.h"
63#include "../../include/socket_codes.h"
64#include "../../include/socket_errno.h"
65
66#include "../../socket/socket_core.h"
67#include "../../socket/socket_messages.h"
68
69#include "../tl_common.h"
70#include "../tl_messages.h"
71
72#include "udp.h"
73#include "udp_header.h"
74#include "udp_module.h"
75
76/** Default UDP checksum computing.
77 */
78#define NET_DEFAULT_UDP_CHECKSUM_COMPUTING true
79
80/** Default UDP autobind when sending via unbound sockets.
81 */
82#define NET_DEFAULT_UDP_AUTOBINDING true
83
84/** Maximum UDP fragment size.
85 */
86#define MAX_UDP_FRAGMENT_SIZE 65535
87
88/** Free ports pool start.
89 */
90#define UDP_FREE_PORTS_START 1025
91
92/** Free ports pool end.
93 */
94#define UDP_FREE_PORTS_END 65535
95
96/** Processes the received UDP packet queue.
97 * Is used as an entry point from the underlying IP module.
98 * Locks the global lock and calls udp_process_packet() function.
99 * @param[in] device_id The receiving device identifier.
100 * @param[in,out] packet The received packet queue.
101 * @param receiver The target service. Ignored parameter.
102 * @param[in] error The packet error reporting service. Prefixes the received packet.
103 * @returns EOK on success.
104 * @returns Other error codes as defined for the udp_process_packet() function.
105 */
106int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error );
107
108/** Processes the received UDP packet queue.
109 * Notifies the destination socket application.
110 * Releases the packet on error or sends an ICMP error notification..
111 * @param[in] device_id The receiving device identifier.
112 * @param[in,out] packet The received packet queue.
113 * @param[in] error The packet error reporting service. Prefixes the received packet.
114 * @returns EOK on success.
115 * @returns EINVAL if the packet is not valid.
116 * @returns EINVAL if the stored packet address is not the an_addr_t.
117 * @returns EINVAL if the packet does not contain any data.
118 * @returns NO_DATA if the packet content is shorter than the user datagram header.
119 * @returns ENOMEM if there is not enough memory left.
120 * @returns EADDRNOTAVAIL if the destination socket does not exist.
121 * @returns Other error codes as defined for the ip_client_process_packet() function.
122 */
123int udp_process_packet( device_id_t device_id, packet_t packet, services_t error );
124
125/** Releases the packet and returns the result.
126 * @param[in] packet The packet queue to be released.
127 * @param[in] result The result to be returned.
128 * @return The result parameter.
129 */
130int udp_release_and_return( packet_t packet, int result );
131
132/** @name Socket messages processing functions
133 */
134/*@{*/
135
136/** Processes the socket client messages.
137 * Runs until the client module disconnects.
138 * @param[in] callid The message identifier.
139 * @param[in] call The message parameters.
140 * @returns EOK on success.
141 * @see socket.h
142 */
143int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call );
144
145/** Sends data from the socket to the remote address.
146 * Binds the socket to a free port if not already connected/bound.
147 * Handles the NET_SOCKET_SENDTO message.
148 * Supports AF_INET and AF_INET6 address families.
149 * @param[in,out] local_sockets The application local sockets.
150 * @param[in] socket_id Socket identifier.
151 * @param[in] addr The destination address.
152 * @param[in] addrlen The address length.
153 * @param[in] fragments The number of data fragments.
154 * @param[out] data_fragment_size The data fragment size in bytes.
155 * @param[in] flags Various send flags.
156 * @returns EOK on success.
157 * @returns EAFNOTSUPPORT if the address family is not supported.
158 * @returns ENOTSOCK if the socket is not found.
159 * @returns EINVAL if the address is invalid.
160 * @returns ENOTCONN if the sending socket is not and cannot be bound.
161 * @returns ENOMEM if there is not enough memory left.
162 * @returns Other error codes as defined for the socket_read_packet_data() function.
163 * @returns Other error codes as defined for the ip_client_prepare_packet() function.
164 * @returns Other error codes as defined for the ip_send_msg() function.
165 */
166int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, size_t * data_fragment_size, int flags );
167
168/** Receives data to the socket.
169 * Handles the NET_SOCKET_RECVFROM message.
170 * Replies the source address as well.
171 * @param[in] local_sockets The application local sockets.
172 * @param[in] socket_id Socket identifier.
173 * @param[in] flags Various receive flags.
174 * @param[out] addrlen The source address length.
175 * @returns The number of bytes received.
176 * @returns ENOTSOCK if the socket is not found.
177 * @returns NO_DATA if there are no received packets or data.
178 * @returns ENOMEM if there is not enough memory left.
179 * @returns EINVAL if the received address is not an IP address.
180 * @returns Other error codes as defined for the packet_translate() function.
181 * @returns Other error codes as defined for the data_reply() function.
182 */
183int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen );
184
185/*@}*/
186
187/** UDP global data.
188 */
189udp_globals_t udp_globals;
190
191int udp_initialize( async_client_conn_t client_connection ){
192 ERROR_DECLARE;
193
194 measured_string_t names[] = {{ str_dup("UDP_CHECKSUM_COMPUTING"), 22 }, { str_dup("UDP_AUTOBINDING"), 15 }};
195 measured_string_ref configuration;
196 size_t count = sizeof( names ) / sizeof( measured_string_t );
197 char * data;
198
199 fibril_rwlock_initialize( & udp_globals.lock );
200 fibril_rwlock_write_lock( & udp_globals.lock );
201 udp_globals.icmp_phone = icmp_connect_module( SERVICE_ICMP, ICMP_CONNECT_TIMEOUT );
202 udp_globals.ip_phone = ip_bind_service( SERVICE_IP, IPPROTO_UDP, SERVICE_UDP, client_connection, udp_received_msg );
203 if( udp_globals.ip_phone < 0 ){
204 return udp_globals.ip_phone;
205 }
206 // read default packet dimensions
207 ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.packet_dimension ));
208 ERROR_PROPAGATE( socket_ports_initialize( & udp_globals.sockets ));
209 if( ERROR_OCCURRED( packet_dimensions_initialize( & udp_globals.dimensions ))){
210 socket_ports_destroy( & udp_globals.sockets );
211 return ERROR_CODE;
212 }
213 udp_globals.packet_dimension.prefix += sizeof( udp_header_t );
214 udp_globals.packet_dimension.content -= sizeof( udp_header_t );
215 udp_globals.last_used_port = UDP_FREE_PORTS_START - 1;
216 // get configuration
217 udp_globals.checksum_computing = NET_DEFAULT_UDP_CHECKSUM_COMPUTING;
218 udp_globals.autobinding = NET_DEFAULT_UDP_AUTOBINDING;
219 configuration = & names[ 0 ];
220 ERROR_PROPAGATE( net_get_conf_req( udp_globals.net_phone, & configuration, count, & data ));
221 if( configuration ){
222 if( configuration[ 0 ].value ){
223 udp_globals.checksum_computing = ( configuration[ 0 ].value[ 0 ] == 'y' );
224 }
225 if( configuration[ 1 ].value ){
226 udp_globals.autobinding = ( configuration[ 1 ].value[ 0 ] == 'y' );
227 }
228 net_free_settings( configuration, data );
229 }
230 fibril_rwlock_write_unlock( & udp_globals.lock );
231 return EOK;
232}
233
234int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error ){
235 int result;
236
237 fibril_rwlock_write_lock( & udp_globals.lock );
238 result = udp_process_packet( device_id, packet, error );
239 if( result != EOK ){
240 fibril_rwlock_write_unlock( & udp_globals.lock );
241 }
242
243 return result;
244}
245
246int udp_process_packet( device_id_t device_id, packet_t packet, services_t error ){
247 ERROR_DECLARE;
248
249 size_t length;
250 size_t offset;
251 int result;
252 udp_header_ref header;
253 socket_core_ref socket;
254 packet_t next_packet;
255 size_t total_length;
256 uint32_t checksum;
257 int fragments;
258 packet_t tmp_packet;
259 icmp_type_t type;
260 icmp_code_t code;
261 ip_pseudo_header_ref ip_header;
262 struct sockaddr * src;
263 struct sockaddr * dest;
264 packet_dimension_ref packet_dimension;
265
266 if( error ){
267 switch( error ){
268 case SERVICE_ICMP:
269 // ignore error
270 // length = icmp_client_header_length( packet );
271 // process error
272 result = icmp_client_process_packet( packet, & type, & code, NULL, NULL );
273 if( result < 0 ){
274 return udp_release_and_return( packet, result );
275 }
276 length = ( size_t ) result;
277 if( ERROR_OCCURRED( packet_trim( packet, length, 0 ))){
278 return udp_release_and_return( packet, ERROR_CODE );
279 }
280 break;
281 default:
282 return udp_release_and_return( packet, ENOTSUP );
283 }
284 }
285 // TODO process received ipopts?
286 result = ip_client_process_packet( packet, NULL, NULL, NULL, NULL, NULL );
287 if( result < 0 ){
288 return udp_release_and_return( packet, result );
289 }
290 offset = ( size_t ) result;
291
292 length = packet_get_data_length( packet );
293 if( length <= 0 ){
294 return udp_release_and_return( packet, EINVAL );
295 }
296 if( length < UDP_HEADER_SIZE + offset ){
297 return udp_release_and_return( packet, NO_DATA );
298 }
299
300 // trim all but UDP header
301 if( ERROR_OCCURRED( packet_trim( packet, offset, 0 ))){
302 return udp_release_and_return( packet, ERROR_CODE );
303 }
304
305 // get udp header
306 header = ( udp_header_ref ) packet_get_data( packet );
307 if( ! header ){
308 return udp_release_and_return( packet, NO_DATA );
309 }
310 // find the destination socket
311 socket = socket_port_find( & udp_globals.sockets, ntohs( header->destination_port ), SOCKET_MAP_KEY_LISTENING, 0 );
312 if( ! socket ){
313 if( tl_prepare_icmp_packet( udp_globals.net_phone, udp_globals.icmp_phone, packet, error ) == EOK ){
314 icmp_destination_unreachable_msg( udp_globals.icmp_phone, ICMP_PORT_UNREACH, 0, packet );
315 }
316 return EADDRNOTAVAIL;
317 }
318
319 // count the received packet fragments
320 next_packet = packet;
321 fragments = 0;
322 total_length = ntohs( header->total_length );
323 // compute header checksum if set
324 if( header->checksum && ( ! error )){
325 result = packet_get_addr( packet, ( uint8_t ** ) & src, ( uint8_t ** ) & dest );
326 if( result <= 0 ){
327 return udp_release_and_return( packet, result );
328 }
329 if( ERROR_OCCURRED( ip_client_get_pseudo_header( IPPROTO_UDP, src, result, dest, result, total_length, & ip_header, & length ))){
330 return udp_release_and_return( packet, ERROR_CODE );
331 }else{
332 checksum = compute_checksum( 0, ip_header, length );
333 // the udp header checksum will be added with the first fragment later
334 free( ip_header );
335 }
336 }else{
337 header->checksum = 0;
338 checksum = 0;
339 }
340
341 do{
342 ++ fragments;
343 length = packet_get_data_length( next_packet );
344 if( length <= 0 ){
345 return udp_release_and_return( packet, NO_DATA );
346 }
347 if( total_length < length ){
348 if( ERROR_OCCURRED( packet_trim( next_packet, 0, length - total_length ))){
349 return udp_release_and_return( packet, ERROR_CODE );
350 }
351 // add partial checksum if set
352 if( header->checksum ){
353 checksum = compute_checksum( checksum, packet_get_data( packet ), packet_get_data_length( packet ));
354 }
355 // relese the rest of the packet fragments
356 tmp_packet = pq_next( next_packet );
357 while( tmp_packet ){
358 next_packet = pq_detach( tmp_packet );
359 pq_release( udp_globals.net_phone, packet_get_id( tmp_packet ));
360 tmp_packet = next_packet;
361 }
362 // exit the loop
363 break;
364 }
365 total_length -= length;
366 // add partial checksum if set
367 if( header->checksum ){
368 checksum = compute_checksum( checksum, packet_get_data( packet ), packet_get_data_length( packet ));
369 }
370 }while(( next_packet = pq_next( next_packet )) && ( total_length > 0 ));
371
372 // check checksum
373 if( header->checksum ){
374 if( flip_checksum( compact_checksum( checksum )) != IP_CHECKSUM_ZERO ){
375 if( tl_prepare_icmp_packet( udp_globals.net_phone, udp_globals.icmp_phone, packet, error ) == EOK ){
376 // checksum error ICMP
377 icmp_parameter_problem_msg( udp_globals.icmp_phone, ICMP_PARAM_POINTER, (( size_t ) (( void * ) & header->checksum )) - (( size_t ) (( void * ) header )), packet );
378 }
379 return EINVAL;
380 }
381 }
382
383 // queue the received packet
384 if( ERROR_OCCURRED( dyn_fifo_push( & socket->received, packet_get_id( packet ), SOCKET_MAX_RECEIVED_SIZE ))
385 || ERROR_OCCURRED( tl_get_ip_packet_dimension( udp_globals.ip_phone, & udp_globals.dimensions, device_id, & packet_dimension ))){
386 return udp_release_and_return( packet, ERROR_CODE );
387 }
388
389 // notify the destination socket
390 fibril_rwlock_write_unlock( & udp_globals.lock );
391 async_msg_5( socket->phone, NET_SOCKET_RECEIVED, ( ipcarg_t ) socket->socket_id, packet_dimension->content, 0, 0, ( ipcarg_t ) fragments );
392 return EOK;
393}
394
395int udp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
396 ERROR_DECLARE;
397
398 packet_t packet;
399
400 * answer_count = 0;
401 switch( IPC_GET_METHOD( * call )){
402 case NET_TL_RECEIVED:
403 if( ! ERROR_OCCURRED( packet_translate( udp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
404 ERROR_CODE = udp_received_msg( IPC_GET_DEVICE( call ), packet, SERVICE_UDP, IPC_GET_ERROR( call ));
405 }
406 return ERROR_CODE;
407 case IPC_M_CONNECT_TO_ME:
408 return udp_process_client_messages( callid, * call );
409 }
410 return ENOTSUP;
411}
412
413int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call ){
414 int res;
415 bool keep_on_going = true;
416 socket_cores_t local_sockets;
417 int app_phone = IPC_GET_PHONE( & call );
418 struct sockaddr * addr;
419 size_t addrlen;
420 fibril_rwlock_t lock;
421 ipc_call_t answer;
422 int answer_count;
423 packet_dimension_ref packet_dimension;
424
425 /*
426 * Accept the connection
427 * - Answer the first IPC_M_CONNECT_TO_ME call.
428 */
429 res = EOK;
430 answer_count = 0;
431
432 // The client connection is only in one fibril and therefore no additional locks are needed.
433
434 socket_cores_initialize( & local_sockets );
435 fibril_rwlock_initialize( & lock );
436
437 while( keep_on_going ){
438
439 // answer the call
440 answer_call( callid, res, & answer, answer_count );
441
442 // refresh data
443 refresh_answer( & answer, & answer_count );
444
445 // get the next call
446 callid = async_get_call( & call );
447
448 // process the call
449 switch( IPC_GET_METHOD( call )){
450 case IPC_M_PHONE_HUNGUP:
451 keep_on_going = false;
452 res = EHANGUP;
453 break;
454 case NET_SOCKET:
455 fibril_rwlock_write_lock( & lock );
456 * SOCKET_SET_SOCKET_ID( answer ) = SOCKET_GET_SOCKET_ID( call );
457 res = socket_create( & local_sockets, app_phone, NULL, SOCKET_SET_SOCKET_ID( answer ));
458 fibril_rwlock_write_unlock( & lock );
459 if( res == EOK ){
460 if( tl_get_ip_packet_dimension( udp_globals.ip_phone, & udp_globals.dimensions, DEVICE_INVALID_ID, & packet_dimension ) == EOK ){
461 * SOCKET_SET_DATA_FRAGMENT_SIZE( answer ) = packet_dimension->content;
462 }
463// * SOCKET_SET_DATA_FRAGMENT_SIZE( answer ) = MAX_UDP_FRAGMENT_SIZE;
464 * SOCKET_SET_HEADER_SIZE( answer ) = UDP_HEADER_SIZE;
465 answer_count = 3;
466 }
467 break;
468 case NET_SOCKET_BIND:
469 res = data_receive(( void ** ) & addr, & addrlen );
470 if( res == EOK ){
471 fibril_rwlock_read_lock( & lock );
472 fibril_rwlock_write_lock( & udp_globals.lock );
473 res = socket_bind( & local_sockets, & udp_globals.sockets, SOCKET_GET_SOCKET_ID( call ), addr, addrlen, UDP_FREE_PORTS_START, UDP_FREE_PORTS_END, udp_globals.last_used_port );
474 fibril_rwlock_write_unlock( & udp_globals.lock );
475 fibril_rwlock_read_unlock( & lock );
476 free( addr );
477 }
478 break;
479 case NET_SOCKET_SENDTO:
480 res = data_receive(( void ** ) & addr, & addrlen );
481 if( res == EOK ){
482 fibril_rwlock_read_lock( & lock );
483 fibril_rwlock_write_lock( & udp_globals.lock );
484 res = udp_sendto_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), addr, addrlen, SOCKET_GET_DATA_FRAGMENTS( call ), SOCKET_SET_DATA_FRAGMENT_SIZE( answer ), SOCKET_GET_FLAGS( call ));
485 if( res != EOK ){
486 fibril_rwlock_write_unlock( & udp_globals.lock );
487 }else{
488 answer_count = 2;
489 }
490 fibril_rwlock_read_unlock( & lock );
491 free( addr );
492 }
493 break;
494 case NET_SOCKET_RECVFROM:
495 fibril_rwlock_read_lock( & lock );
496 fibril_rwlock_write_lock( & udp_globals.lock );
497 res = udp_recvfrom_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), SOCKET_GET_FLAGS( call ), & addrlen );
498 fibril_rwlock_write_unlock( & udp_globals.lock );
499 fibril_rwlock_read_unlock( & lock );
500 if( res > 0 ){
501 * SOCKET_SET_READ_DATA_LENGTH( answer ) = res;
502 * SOCKET_SET_ADDRESS_LENGTH( answer ) = addrlen;
503 answer_count = 3;
504 res = EOK;
505 }
506 break;
507 case NET_SOCKET_CLOSE:
508 fibril_rwlock_write_lock( & lock );
509 fibril_rwlock_write_lock( & udp_globals.lock );
510 res = socket_destroy( udp_globals.net_phone, SOCKET_GET_SOCKET_ID( call ), & local_sockets, & udp_globals.sockets, NULL );
511 fibril_rwlock_write_unlock( & udp_globals.lock );
512 fibril_rwlock_write_unlock( & lock );
513 break;
514 case NET_SOCKET_GETSOCKOPT:
515 case NET_SOCKET_SETSOCKOPT:
516 default:
517 res = ENOTSUP;
518 break;
519 }
520 }
521
522 // release all local sockets
523 socket_cores_release( udp_globals.net_phone, & local_sockets, & udp_globals.sockets, NULL );
524
525 return res;
526}
527
528int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, size_t * data_fragment_size, int flags ){
529 ERROR_DECLARE;
530
531 socket_core_ref socket;
532 packet_t packet;
533 packet_t next_packet;
534 udp_header_ref header;
535 int index;
536 size_t total_length;
537 int result;
538 uint16_t dest_port;
539 uint32_t checksum;
540 ip_pseudo_header_ref ip_header;
541 size_t headerlen;
542 device_id_t device_id;
543 packet_dimension_ref packet_dimension;
544
545 ERROR_PROPAGATE( tl_get_address_port( addr, addrlen, & dest_port ));
546
547 socket = socket_cores_find( local_sockets, socket_id );
548 if( ! socket ) return ENOTSOCK;
549
550 if(( socket->port <= 0 ) && udp_globals.autobinding ){
551 // bind the socket to a random free port if not bound
552// do{
553 // try to find a free port
554// fibril_rwlock_read_unlock( & udp_globals.lock );
555// fibril_rwlock_write_lock( & udp_globals.lock );
556 // might be changed in the meantime
557// if( socket->port <= 0 ){
558 if( ERROR_OCCURRED( socket_bind_free_port( & udp_globals.sockets, socket, UDP_FREE_PORTS_START, UDP_FREE_PORTS_END, udp_globals.last_used_port ))){
559// fibril_rwlock_write_unlock( & udp_globals.lock );
560// fibril_rwlock_read_lock( & udp_globals.lock );
561 return ERROR_CODE;
562 }
563 // set the next port as the search starting port number
564 udp_globals.last_used_port = socket->port;
565// }
566// fibril_rwlock_write_unlock( & udp_globals.lock );
567// fibril_rwlock_read_lock( & udp_globals.lock );
568 // might be changed in the meantime
569// }while( socket->port <= 0 );
570 }
571
572 if( udp_globals.checksum_computing ){
573 if( ERROR_OCCURRED( ip_get_route_req( udp_globals.ip_phone, IPPROTO_UDP, addr, addrlen, & device_id, & ip_header, & headerlen ))){
574 return udp_release_and_return( packet, ERROR_CODE );
575 }
576 // get the device packet dimension
577// ERROR_PROPAGATE( tl_get_ip_packet_dimension( udp_globals.ip_phone, & udp_globals.dimensions, device_id, & packet_dimension ));
578 }
579// }else{
580 // do not ask all the time
581 ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.packet_dimension ));
582 packet_dimension = & udp_globals.packet_dimension;
583// }
584
585 // read the first packet fragment
586 result = tl_socket_read_packet_data( udp_globals.net_phone, & packet, UDP_HEADER_SIZE, packet_dimension, addr, addrlen );
587 if( result < 0 ) return result;
588 total_length = ( size_t ) result;
589 if( udp_globals.checksum_computing ){
590 checksum = compute_checksum( 0, packet_get_data( packet ), packet_get_data_length( packet ));
591 }else{
592 checksum = 0;
593 }
594 // prefix the udp header
595 header = PACKET_PREFIX( packet, udp_header_t );
596 if( ! header ){
597 return udp_release_and_return( packet, ENOMEM );
598 }
599 bzero( header, sizeof( * header ));
600 // read the rest of the packet fragments
601 for( index = 1; index < fragments; ++ index ){
602 result = tl_socket_read_packet_data( udp_globals.net_phone, & next_packet, 0, packet_dimension, addr, addrlen );
603 if( result < 0 ){
604 return udp_release_and_return( packet, result );
605 }
606 if( ERROR_OCCURRED( pq_add( & packet, next_packet, index, 0 ))){
607 return udp_release_and_return( packet, ERROR_CODE );
608 }
609 total_length += ( size_t ) result;
610 if( udp_globals.checksum_computing ){
611 checksum = compute_checksum( checksum, packet_get_data( next_packet ), packet_get_data_length( next_packet ));
612 }
613 }
614 // set the udp header
615 header->source_port = htons(( socket->port > 0 ) ? socket->port : 0 );
616 header->destination_port = htons( dest_port );
617 header->total_length = htons( total_length + sizeof( * header ));
618 header->checksum = 0;
619 if( udp_globals.checksum_computing ){
620 // update the pseudo header
621 if( ERROR_OCCURRED( ip_client_set_pseudo_header_data_length( ip_header, headerlen, total_length + UDP_HEADER_SIZE ))){
622 free( ip_header );
623 return udp_release_and_return( packet, ERROR_CODE );
624 }
625 // finish the checksum computation
626 checksum = compute_checksum( checksum, ip_header, headerlen );
627 checksum = compute_checksum( checksum, ( uint8_t * ) header, sizeof( * header ));
628 header->checksum = htons( flip_checksum( compact_checksum( checksum )));
629 free( ip_header );
630 }else{
631 device_id = DEVICE_INVALID_ID;
632 }
633 // prepare the first packet fragment
634 if( ERROR_OCCURRED( ip_client_prepare_packet( packet, IPPROTO_UDP, 0, 0, 0, 0 ))){
635 return udp_release_and_return( packet, ERROR_CODE );
636 }
637 // send the packet
638 fibril_rwlock_write_unlock( & udp_globals.lock );
639 ip_send_msg( udp_globals.ip_phone, device_id, packet, SERVICE_UDP, 0 );
640 return EOK;
641}
642
643int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen ){
644 ERROR_DECLARE;
645
646 socket_core_ref socket;
647 int packet_id;
648 packet_t packet;
649 udp_header_ref header;
650 struct sockaddr * addr;
651 size_t length;
652 uint8_t * data;
653 int result;
654
655 // find the socket
656 socket = socket_cores_find( local_sockets, socket_id );
657 if( ! socket ) return ENOTSOCK;
658 // get the next received packet
659 packet_id = dyn_fifo_value( & socket->received );
660 if( packet_id < 0 ) return NO_DATA;
661 ERROR_PROPAGATE( packet_translate( udp_globals.net_phone, & packet, packet_id ));
662 // get udp header
663 data = packet_get_data( packet );
664 if( ! data ){
665 pq_release( udp_globals.net_phone, packet_id );
666 return NO_DATA;
667 }
668 header = ( udp_header_ref ) data;
669
670 // set the source address port
671 result = packet_get_addr( packet, ( uint8_t ** ) & addr, NULL );
672 if( ERROR_OCCURRED( tl_set_address_port( addr, result, ntohs( header->source_port )))){
673 pq_release( udp_globals.net_phone, packet_id );
674 return ERROR_CODE;
675 }
676 * addrlen = ( size_t ) result;
677 // send the source address
678 ERROR_PROPAGATE( data_reply( addr, * addrlen ));
679
680 // trim the header
681 ERROR_PROPAGATE( packet_trim( packet, UDP_HEADER_SIZE, 0 ));
682
683 // reply the packets
684 ERROR_PROPAGATE( socket_reply_packets( packet, & length ));
685
686 // release the packet
687 dyn_fifo_pop( & socket->received );
688 pq_release( udp_globals.net_phone, packet_get_id( packet ));
689 // return the total length
690 return ( int ) length;
691}
692
693int udp_release_and_return( packet_t packet, int result ){
694 pq_release( udp_globals.net_phone, packet_get_id( packet ));
695 return result;
696}
697
698/** @}
699 */
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