1 /* 2 * Copyright (C) 2009 by Matthias Ringwald 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 21 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * l2cap.c 34 * 35 * Logical Link Control and Adaption Protocl (L2CAP) 36 * 37 * Created by Matthias Ringwald on 5/16/09. 38 */ 39 40 #include "l2cap.h" 41 #include "hci.h" 42 #include "hci_dump.h" 43 44 #include <stdarg.h> 45 #include <string.h> 46 47 #include <stdio.h> 48 49 // size of HCI ACL + L2CAP Header for regular data packets 50 #define COMPLETE_L2CAP_HEADER 8 51 52 // offsets for L2CAP SIGNALING COMMANDS 53 #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 54 #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 55 #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 56 #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 57 58 static void null_event_handler(connection_t * connection, uint8_t *packet, uint16_t size); 59 static void null_data_handler(connection_t * connection, uint16_t local_cid, uint8_t *packet, uint16_t size); 60 61 static uint8_t * sig_buffer = NULL; 62 static linked_list_t l2cap_channels = NULL; 63 static linked_list_t l2cap_services = NULL; 64 static uint8_t * acl_buffer = NULL; 65 static void (*event_packet_handler) (connection_t * connection, uint8_t *packet, uint16_t size) = null_event_handler; 66 static void (*data_packet_handler) (connection_t * connection, uint16_t local_cid, uint8_t *packet, uint16_t size) = null_data_handler; 67 static connection_t * capture_connection = NULL; 68 69 static uint8_t config_options[] = { 1, 2, 150, 0}; // mtu = 48 70 71 void l2cap_init(){ 72 sig_buffer = malloc( 48 ); 73 acl_buffer = malloc( 255 + 8 ); 74 75 // 76 // register callbacks with HCI 77 // 78 hci_register_event_packet_handler(&l2cap_event_handler); 79 hci_register_acl_packet_handler(&l2cap_acl_handler); 80 } 81 82 83 /** Register L2CAP packet handlers */ 84 static void null_event_handler(connection_t * connection, uint8_t *packet, uint16_t size){ 85 } 86 static void null_data_handler(connection_t * connection, uint16_t local_cid, uint8_t *packet, uint16_t size){ 87 } 88 void l2cap_register_event_packet_handler(void (*handler)(connection_t * connection, uint8_t *packet, uint16_t size)){ 89 event_packet_handler = handler; 90 } 91 void l2cap_register_data_packet_handler (void (*handler)(connection_t * connection, uint16_t local_cid, uint8_t *packet, uint16_t size)){ 92 data_packet_handler = handler; 93 } 94 95 int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 96 // printf("l2cap_send_signaling_packet type %u\n", cmd); 97 va_list argptr; 98 va_start(argptr, identifier); 99 uint16_t len = l2cap_create_signaling_internal(sig_buffer, handle, cmd, identifier, argptr); 100 va_end(argptr); 101 return hci_send_acl_packet(sig_buffer, len); 102 } 103 104 l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 105 linked_item_t *it; 106 l2cap_channel_t * channel; 107 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 108 channel = (l2cap_channel_t *) it; 109 if ( channel->local_cid == local_cid) { 110 return channel; 111 } 112 } 113 return NULL; 114 } 115 116 // open outgoing L2CAP channel 117 void l2cap_create_channel_internal(connection_t * connection, bd_addr_t address, uint16_t psm){ 118 119 // alloc structure 120 l2cap_channel_t * chan = malloc(sizeof(l2cap_channel_t)); 121 // TODO: emit error event 122 if (!chan) return; 123 124 // fill in 125 BD_ADDR_COPY(chan->address, address); 126 chan->psm = psm; 127 chan->handle = 0; 128 chan->connection = connection; 129 chan->packet_handler = NULL; 130 131 // set initial state 132 chan->state = L2CAP_STATE_CLOSED; 133 chan->sig_id = L2CAP_SIG_ID_INVALID; 134 135 // add to connections list 136 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 137 138 // send connection request 139 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 140 hci_send_cmd(&hci_create_connection, address, 0x18, 0, 0, 0, 0); 141 } 142 143 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 144 // find channel for local_cid 145 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 146 if (channel) { 147 channel->sig_id = l2cap_next_sig_id(); 148 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->remote_cid, channel->local_cid); 149 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 150 } 151 } 152 153 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 154 linked_item_t *it; 155 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 156 l2cap_channel_t * channel = (l2cap_channel_t *) it; 157 if ( ! BD_ADDR_CMP( channel->address, address) ){ 158 if (channel->state == L2CAP_STATE_CLOSED) { 159 // failure, forward error code 160 l2cap_emit_channel_opened(channel, status); 161 // discard channel 162 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 163 free (channel); 164 } 165 } 166 } 167 } 168 169 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 170 linked_item_t *it; 171 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 172 l2cap_channel_t * channel = (l2cap_channel_t *) it; 173 if ( ! BD_ADDR_CMP( channel->address, address) ){ 174 if (channel->state == L2CAP_STATE_CLOSED) { 175 // success, start l2cap handshake 176 channel->handle = handle; 177 channel->sig_id = l2cap_next_sig_id(); 178 channel->local_cid = l2cap_next_local_cid(); 179 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 180 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->sig_id, channel->psm, channel->local_cid); 181 } 182 } 183 } 184 } 185 186 void l2cap_event_handler( uint8_t *packet, uint16_t size ){ 187 188 bd_addr_t address; 189 hci_con_handle_t handle; 190 191 switch(packet[0]){ 192 193 // handle connection complete events 194 case HCI_EVENT_CONNECTION_COMPLETE: 195 bt_flip_addr(address, &packet[5]); 196 if (packet[2] == 0){ 197 handle = READ_BT_16(packet, 3); 198 l2cap_handle_connection_success_for_addr(address, handle); 199 } else { 200 l2cap_handle_connection_failed_for_addr(address, packet[2]); 201 } 202 break; 203 204 // handle successful create connection cancel command 205 case HCI_EVENT_COMMAND_COMPLETE: 206 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 207 if (packet[5] == 0){ 208 bt_flip_addr(address, &packet[6]); 209 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 210 l2cap_handle_connection_failed_for_addr(address, 0x16); 211 } 212 } 213 break; 214 215 // handle disconnection complete events 216 case HCI_EVENT_DISCONNECTION_COMPLETE: 217 // send l2cap disconnect events for all channels on this handle 218 handle = READ_BT_16(packet, 3); 219 linked_item_t *it; 220 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 221 l2cap_channel_t * channel = (l2cap_channel_t *) it; 222 if ( channel->handle == handle ){ 223 l2cap_finialize_channel_close(channel); 224 } 225 } 226 break; 227 228 // HCI Connection Timeouts 229 case L2CAP_EVENT_TIMEOUT_CHECK: 230 if (!capture_connection){ 231 hci_con_handle_t handle = READ_BT_16(packet, 2); 232 linked_item_t *it; 233 l2cap_channel_t * channel; 234 int used = 0; 235 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 236 channel = (l2cap_channel_t *) it; 237 if (channel->handle == handle) { 238 used = 1; 239 } 240 } 241 if (!used) { 242 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 243 } 244 } 245 break; 246 247 default: 248 break; 249 } 250 251 // pass on 252 (*event_packet_handler)(NULL, packet, size); 253 } 254 255 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 256 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, identifier, channel->remote_cid, channel->local_cid); 257 l2cap_finialize_channel_close(channel); 258 } 259 260 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 261 262 // printf("l2cap_handle_connection_request for handle %u, psm %u cid %u\n", handle, psm, source_cid); 263 l2cap_service_t *service = l2cap_get_service(psm); 264 if (!service) { 265 // 0x0002 PSM not supported 266 // printf("l2cap_handle_connection_request no PSM for psm %u/n", psm); 267 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, 0x0002, 0); 268 return; 269 } 270 271 hci_connection_t * hci_connection = connection_for_handle( handle ); 272 if (!hci_connection) { 273 fprintf(stderr, "no hci_connection for handle %u\n", handle); 274 // TODO: emit error 275 return; 276 } 277 // alloc structure 278 // printf("l2cap_handle_connection_request register channel\n"); 279 l2cap_channel_t * channel = malloc(sizeof(l2cap_channel_t)); 280 // TODO: emit error event 281 if (!channel) return; 282 283 // fill in 284 BD_ADDR_COPY(channel->address, hci_connection->address); 285 channel->psm = psm; 286 channel->handle = handle; 287 channel->connection = service->connection; 288 channel->packet_handler = service->packet_handler; 289 channel->local_cid = l2cap_next_local_cid(); 290 channel->remote_cid = source_cid; 291 292 // set initial state 293 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 294 295 // temp. store req sig id 296 channel->sig_id = sig_id; 297 298 // add to connections list 299 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 300 301 // emit incoming connection request 302 l2cap_emit_connection_request(channel); 303 } 304 305 void l2cap_accept_connection_internal(uint16_t local_cid){ 306 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 307 if (!channel) { 308 fprintf(stderr, "l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 309 return; 310 } 311 312 // accept connection 313 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->sig_id, channel->local_cid, channel->remote_cid, 0, 0); 314 315 // set real sig and state and start config 316 channel->sig_id = l2cap_next_sig_id(); 317 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 318 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->remote_cid, 0, 4, &config_options); 319 320 // printf("new state %u\n", channel->state); 321 } 322 323 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 324 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 325 if (!channel) { 326 fprintf(stderr, "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid,reason); 327 return; 328 } 329 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->sig_id, 0, 0, reason, 0); 330 331 // discard channel 332 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 333 free (channel); 334 } 335 336 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 337 338 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 339 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 340 uint16_t len = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 341 uint16_t result = 0; 342 343 // printf("signaling handler code %u\n", code); 344 345 switch (channel->state) { 346 347 case L2CAP_STATE_WAIT_CONNECT_RSP: 348 switch (code){ 349 case CONNECTION_RESPONSE: 350 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 351 switch (result) { 352 case 0: 353 // successful connection 354 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 355 channel->sig_id = l2cap_next_sig_id(); 356 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->remote_cid, 0, 4, &config_options); 357 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 358 break; 359 case 1: 360 // connection pending. get some coffee 361 break; 362 default: 363 // map l2cap connection response result to BTstack status enumeration 364 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 365 break; 366 } 367 break; 368 369 case DISCONNECTION_REQUEST: 370 l2cap_handle_disconnect_request(channel, identifier); 371 break; 372 373 default: 374 //@TODO: implement other signaling packets 375 break; 376 } 377 break; 378 379 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ: 380 switch (code) { 381 case CONFIGURE_RESPONSE: 382 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ; 383 break; 384 case CONFIGURE_REQUEST: 385 // accept the other's configuration options 386 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->remote_cid, 0, 0, len-4, &command[8]); 387 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP; 388 break; 389 case DISCONNECTION_REQUEST: 390 l2cap_handle_disconnect_request(channel, identifier); 391 break; 392 default: 393 //@TODO: implement other signaling packets 394 break; 395 } 396 break; 397 398 case L2CAP_STATE_WAIT_CONFIG_REQ: 399 switch (code) { 400 case CONFIGURE_REQUEST: 401 // accept the other's configuration options 402 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->remote_cid, 0, 0, len-4, &command[8]); 403 channel->state = L2CAP_STATE_OPEN; 404 l2cap_emit_channel_opened(channel, 0); // success 405 break; 406 case DISCONNECTION_REQUEST: 407 l2cap_handle_disconnect_request(channel, identifier); 408 break; 409 default: 410 //@TODO: implement other signaling packets 411 break; 412 } 413 break; 414 415 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP: 416 switch (code) { 417 case CONFIGURE_RESPONSE: 418 channel->state = L2CAP_STATE_OPEN; 419 l2cap_emit_channel_opened(channel, 0); // success 420 break; 421 case DISCONNECTION_REQUEST: 422 l2cap_handle_disconnect_request(channel, identifier); 423 break; 424 default: 425 //@TODO: implement other signaling packets 426 break; 427 } 428 break; 429 430 case L2CAP_STATE_WAIT_DISCONNECT: 431 switch (code) { 432 case DISCONNECTION_RESPONSE: 433 l2cap_finialize_channel_close(channel); 434 break; 435 case DISCONNECTION_REQUEST: 436 l2cap_handle_disconnect_request(channel, identifier); 437 break; 438 default: 439 //@TODO: implement other signaling packets 440 break; 441 } 442 break; 443 444 case L2CAP_STATE_CLOSED: 445 // @TODO handle incoming requests 446 break; 447 448 case L2CAP_STATE_OPEN: 449 switch (code) { 450 case DISCONNECTION_REQUEST: 451 l2cap_handle_disconnect_request(channel, identifier); 452 break; 453 default: 454 //@TODO: implement other signaling packets, e.g. re-configure 455 break; 456 } 457 break; 458 } 459 // printf("new state %u\n", channel->state); 460 } 461 462 463 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 464 465 // get code, signalind identifier and command len 466 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 467 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 468 uint16_t len = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 469 470 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 471 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 472 return; 473 } 474 475 // general commands without an assigned channel 476 switch(code) { 477 478 case CONNECTION_REQUEST: { 479 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 480 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 481 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 482 break; 483 } 484 485 case ECHO_REQUEST: { 486 // send back packet 487 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, len, &command[L2CAP_SIGNALING_COMMAND_DATA_OFFSET]); 488 break; 489 } 490 491 case INFORMATION_REQUEST: { 492 // we neither support connectionless L2CAP data nor support any flow control modes yet 493 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 494 if (infoType == 2) { 495 uint32_t features = 0; 496 // extended features request supported, however no features present 497 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, 4, &features); 498 } else { 499 // all other types are not supported 500 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 501 } 502 break;; 503 } 504 505 default: 506 break; 507 } 508 509 510 // Get potential destination CID 511 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 512 513 // Find channel for this sig_id and connection handle 514 linked_item_t *it; 515 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 516 l2cap_channel_t * channel = (l2cap_channel_t *) it; 517 if (channel->handle == handle) { 518 if (code & 1) { 519 // match odd commands by previous signaling identifier 520 if (channel->sig_id == sig_id) { 521 l2cap_signaling_handler_channel(channel, command); 522 } 523 } else { 524 // match even commands by local channel id 525 if (channel->local_cid == dest_cid) { 526 l2cap_signaling_handler_channel(channel, command); 527 } 528 } 529 } 530 } 531 } 532 533 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 534 535 // Capturing? 536 if (capture_connection) { 537 (*data_packet_handler)(capture_connection, 0, packet, size); 538 return; 539 } 540 541 // Get Channel ID 542 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 543 544 // Signaling Packet? 545 if (channel_id == 1) { 546 547 // Get Connection 548 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 549 550 uint16_t command_offset = 8; 551 while (command_offset < size) { 552 553 // handle signaling commands 554 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 555 556 // increment command_offset 557 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 558 } 559 return; 560 } 561 562 // Find channel for this channel_id and connection handle 563 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 564 if (channel) { 565 (*data_packet_handler)(channel->connection, channel_id, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 566 } 567 } 568 569 570 // finalize closed channel 571 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 572 channel->state = L2CAP_STATE_CLOSED; 573 l2cap_emit_channel_closed(channel); 574 575 // discard channel 576 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 577 free (channel); 578 } 579 580 l2cap_service_t * l2cap_get_service(uint16_t psm){ 581 linked_item_t *it; 582 583 // close open channels 584 for (it = (linked_item_t *) l2cap_services; it ; it = it->next){ 585 l2cap_service_t * service = ((l2cap_service_t *) it); 586 if ( service->psm == psm){ 587 return service; 588 }; 589 } 590 return NULL; 591 } 592 593 void l2cap_register_service_internal(connection_t *connection, btstack_packet_handler_t packet_handler, uint16_t psm, uint16_t mtu){ 594 // check for alread registered psm // TODO: emit error event 595 l2cap_service_t *service = l2cap_get_service(psm); 596 if (service) return; 597 598 // alloc structure // TODO: emit error event 599 service = malloc(sizeof(l2cap_service_t)); 600 if (!service) return; 601 602 // fill in 603 service->psm = psm; 604 service->mtu = mtu; 605 service->connection = connection; 606 service->packet_handler = packet_handler; 607 608 // add to services list 609 linked_list_add(&l2cap_services, (linked_item_t *) service); 610 } 611 612 void l2cap_unregister_service_internal(connection_t *connection, uint16_t psm){ 613 l2cap_service_t *service = l2cap_get_service(psm); 614 if (!service) return; 615 linked_list_remove(&l2cap_services, (linked_item_t *) service); 616 free(service); 617 } 618 619 // 620 void l2cap_close_connection(connection_t *connection){ 621 linked_item_t *it; 622 623 // close open channels 624 l2cap_channel_t * channel; 625 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 626 channel = (l2cap_channel_t *) it; 627 if (channel->connection == connection) { 628 channel->sig_id = l2cap_next_sig_id(); 629 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->remote_cid, channel->local_cid); 630 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 631 } 632 } 633 634 // unregister services 635 l2cap_service_t *service; 636 for (it = (linked_item_t *) l2cap_services; it ; ){ 637 service = (l2cap_service_t *) it->next; 638 if (service->connection == connection){ 639 it->next = service->item.next; 640 free(service); 641 } else { 642 it = it->next; 643 } 644 } 645 } 646 647 // notify client/protocol handler 648 void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 649 if (channel->packet_handler) { 650 (* (channel->packet_handler))(type, channel->local_cid, data, size); 651 } else { 652 (*event_packet_handler)(channel->connection, data, size); 653 } 654 } 655 656 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 657 uint8_t event[17]; 658 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 659 event[1] = sizeof(event) - 2; 660 event[2] = status; 661 bt_flip_addr(&event[3], channel->address); 662 bt_store_16(event, 9, channel->handle); 663 bt_store_16(event, 11, channel->psm); 664 bt_store_16(event, 13, channel->local_cid); 665 bt_store_16(event, 15, channel->remote_cid); 666 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 667 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 668 } 669 670 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 671 uint8_t event[4]; 672 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 673 event[1] = sizeof(event) - 2; 674 bt_store_16(event, 2, channel->local_cid); 675 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 676 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 677 } 678 679 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 680 uint8_t event[16]; 681 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 682 event[1] = sizeof(event) - 2; 683 bt_flip_addr(&event[2], channel->address); 684 bt_store_16(event, 8, channel->handle); 685 bt_store_16(event, 10, channel->psm); 686 bt_store_16(event, 12, channel->local_cid); 687 bt_store_16(event, 14, channel->remote_cid); 688 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 689 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 690 } 691 692 void l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 693 // find channel for local_cid, construct l2cap packet and send 694 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 695 if (channel) { 696 // 0 - Connection handle : PB=10 : BC=00 697 bt_store_16(acl_buffer, 0, channel->handle | (2 << 12) | (0 << 14)); 698 // 2 - ACL length 699 bt_store_16(acl_buffer, 2, len + 4); 700 // 4 - L2CAP packet length 701 bt_store_16(acl_buffer, 4, len + 0); 702 // 6 - L2CAP channel DEST 703 bt_store_16(acl_buffer, 6, channel->remote_cid); 704 // 8 - data 705 memcpy(&acl_buffer[8], data, len); 706 // send 707 hci_send_acl_packet(acl_buffer, len+8); 708 } 709 } 710 711 void l2cap_set_capture_connection(connection_t * connection){ 712 capture_connection = connection; 713 } 714 715