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; 129 130 // set initial state 131 chan->state = L2CAP_STATE_CLOSED; 132 chan->sig_id = L2CAP_SIG_ID_INVALID; 133 134 // add to connections list 135 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 136 137 // send connection request 138 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 139 hci_send_cmd(&hci_create_connection, address, 0x18, 0, 0, 0, 0); 140 } 141 142 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 143 // find channel for local_cid 144 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 145 if (channel) { 146 channel->sig_id = l2cap_next_sig_id(); 147 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->remote_cid, channel->local_cid); 148 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 149 } 150 } 151 152 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 153 linked_item_t *it; 154 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 155 l2cap_channel_t * channel = (l2cap_channel_t *) it; 156 if ( ! BD_ADDR_CMP( channel->address, address) ){ 157 if (channel->state == L2CAP_STATE_CLOSED) { 158 // failure, forward error code 159 l2cap_emit_channel_opened(channel, status); 160 // discard channel 161 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 162 free (channel); 163 } 164 } 165 } 166 } 167 168 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 169 linked_item_t *it; 170 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 171 l2cap_channel_t * channel = (l2cap_channel_t *) it; 172 if ( ! BD_ADDR_CMP( channel->address, address) ){ 173 if (channel->state == L2CAP_STATE_CLOSED) { 174 // success, start l2cap handshake 175 channel->handle = handle; 176 channel->sig_id = l2cap_next_sig_id(); 177 channel->local_cid = l2cap_next_local_cid(); 178 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 179 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->sig_id, channel->psm, channel->local_cid); 180 } 181 } 182 } 183 } 184 185 void l2cap_event_handler( uint8_t *packet, uint16_t size ){ 186 187 bd_addr_t address; 188 hci_con_handle_t handle; 189 190 switch(packet[0]){ 191 192 // handle connection complete events 193 case HCI_EVENT_CONNECTION_COMPLETE: 194 bt_flip_addr(address, &packet[5]); 195 if (packet[2] == 0){ 196 handle = READ_BT_16(packet, 3); 197 l2cap_handle_connection_success_for_addr(address, handle); 198 } else { 199 l2cap_handle_connection_failed_for_addr(address, packet[2]); 200 } 201 break; 202 203 // handle successful create connection cancel command 204 case HCI_EVENT_COMMAND_COMPLETE: 205 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 206 if (packet[5] == 0){ 207 bt_flip_addr(address, &packet[6]); 208 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 209 l2cap_handle_connection_failed_for_addr(address, 0x16); 210 } 211 } 212 break; 213 214 // handle disconnection complete events 215 case HCI_EVENT_DISCONNECTION_COMPLETE: 216 // send l2cap disconnect events for all channels on this handle 217 handle = READ_BT_16(packet, 3); 218 linked_item_t *it; 219 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 220 l2cap_channel_t * channel = (l2cap_channel_t *) it; 221 if ( channel->handle == handle ){ 222 l2cap_finialize_channel_close(channel); 223 } 224 } 225 break; 226 227 // HCI Connection Timeouts 228 case L2CAP_EVENT_TIMEOUT_CHECK: 229 if (!capture_connection){ 230 hci_con_handle_t handle = READ_BT_16(packet, 2); 231 linked_item_t *it; 232 l2cap_channel_t * channel; 233 int used = 0; 234 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 235 channel = (l2cap_channel_t *) it; 236 if (channel->handle == handle) { 237 used = 1; 238 } 239 } 240 if (!used) { 241 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 242 } 243 } 244 break; 245 246 default: 247 break; 248 } 249 250 // pass on 251 (*event_packet_handler)(NULL, packet, size); 252 } 253 254 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 255 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, identifier, channel->remote_cid, channel->local_cid); 256 l2cap_finialize_channel_close(channel); 257 } 258 259 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 260 261 // printf("l2cap_handle_connection_request for handle %u, psm %u cid %u\n", handle, psm, source_cid); 262 l2cap_service_t *service = l2cap_get_service(psm); 263 if (!service) { 264 // 0x0002 PSM not supported 265 // printf("l2cap_handle_connection_request no PSM for psm %u/n", psm); 266 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, 0x0002, 0); 267 return; 268 } 269 270 hci_connection_t * hci_connection = connection_for_handle( handle ); 271 if (!hci_connection) { 272 fprintf(stderr, "no hci_connection for handle %u\n", handle); 273 // TODO: emit error 274 return; 275 } 276 // alloc structure 277 // printf("l2cap_handle_connection_request register channel\n"); 278 l2cap_channel_t * channel = malloc(sizeof(l2cap_channel_t)); 279 // TODO: emit error event 280 if (!channel) return; 281 282 // fill in 283 BD_ADDR_COPY(channel->address, hci_connection->address); 284 channel->psm = psm; 285 channel->handle = handle; 286 channel->connection = service->connection; 287 channel->local_cid = l2cap_next_local_cid(); 288 channel->remote_cid = source_cid; 289 290 // set initial state 291 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 292 293 // temp. store req sig id 294 channel->sig_id = sig_id; 295 296 // add to connections list 297 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 298 299 // emit incoming connection request 300 l2cap_emit_connection_request(channel); 301 } 302 303 void l2cap_accept_connection_internal(uint16_t local_cid){ 304 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 305 if (!channel) { 306 fprintf(stderr, "l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 307 return; 308 } 309 310 // accept connection 311 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->sig_id, channel->local_cid, channel->remote_cid, 0, 0); 312 313 // set real sig and state and start config 314 channel->sig_id = l2cap_next_sig_id(); 315 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 316 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->remote_cid, 0, 4, &config_options); 317 318 // printf("new state %u\n", channel->state); 319 } 320 321 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 322 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 323 if (!channel) { 324 fprintf(stderr, "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid,reason); 325 return; 326 } 327 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->sig_id, 0, 0, reason, 0); 328 329 // discard channel 330 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 331 free (channel); 332 } 333 334 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 335 336 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 337 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 338 uint16_t len = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 339 uint16_t result = 0; 340 341 // printf("signaling handler code %u\n", code); 342 343 switch (channel->state) { 344 345 case L2CAP_STATE_WAIT_CONNECT_RSP: 346 switch (code){ 347 case CONNECTION_RESPONSE: 348 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 349 switch (result) { 350 case 0: 351 // successful connection 352 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 353 channel->sig_id = l2cap_next_sig_id(); 354 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->remote_cid, 0, 4, &config_options); 355 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 356 break; 357 case 1: 358 // connection pending. get some coffee 359 break; 360 default: 361 // map l2cap connection response result to BTstack status enumeration 362 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 363 break; 364 } 365 break; 366 367 case DISCONNECTION_REQUEST: 368 l2cap_handle_disconnect_request(channel, identifier); 369 break; 370 371 default: 372 //@TODO: implement other signaling packets 373 break; 374 } 375 break; 376 377 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ: 378 switch (code) { 379 case CONFIGURE_RESPONSE: 380 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ; 381 break; 382 case CONFIGURE_REQUEST: 383 // accept the other's configuration options 384 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->remote_cid, 0, 0, len-4, &command[8]); 385 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP; 386 break; 387 case DISCONNECTION_REQUEST: 388 l2cap_handle_disconnect_request(channel, identifier); 389 break; 390 default: 391 //@TODO: implement other signaling packets 392 break; 393 } 394 break; 395 396 case L2CAP_STATE_WAIT_CONFIG_REQ: 397 switch (code) { 398 case CONFIGURE_REQUEST: 399 // accept the other's configuration options 400 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->remote_cid, 0, 0, len-4, &command[8]); 401 channel->state = L2CAP_STATE_OPEN; 402 l2cap_emit_channel_opened(channel, 0); // success 403 break; 404 case DISCONNECTION_REQUEST: 405 l2cap_handle_disconnect_request(channel, identifier); 406 break; 407 default: 408 //@TODO: implement other signaling packets 409 break; 410 } 411 break; 412 413 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP: 414 switch (code) { 415 case CONFIGURE_RESPONSE: 416 channel->state = L2CAP_STATE_OPEN; 417 l2cap_emit_channel_opened(channel, 0); // success 418 break; 419 case DISCONNECTION_REQUEST: 420 l2cap_handle_disconnect_request(channel, identifier); 421 break; 422 default: 423 //@TODO: implement other signaling packets 424 break; 425 } 426 break; 427 428 case L2CAP_STATE_WAIT_DISCONNECT: 429 switch (code) { 430 case DISCONNECTION_RESPONSE: 431 l2cap_finialize_channel_close(channel); 432 break; 433 case DISCONNECTION_REQUEST: 434 l2cap_handle_disconnect_request(channel, identifier); 435 break; 436 default: 437 //@TODO: implement other signaling packets 438 break; 439 } 440 break; 441 442 case L2CAP_STATE_CLOSED: 443 // @TODO handle incoming requests 444 break; 445 446 case L2CAP_STATE_OPEN: 447 switch (code) { 448 case DISCONNECTION_REQUEST: 449 l2cap_handle_disconnect_request(channel, identifier); 450 break; 451 default: 452 //@TODO: implement other signaling packets, e.g. re-configure 453 break; 454 } 455 break; 456 } 457 // printf("new state %u\n", channel->state); 458 } 459 460 461 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 462 463 // get code, signalind identifier and command len 464 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 465 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 466 uint16_t len = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 467 468 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 469 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 470 return; 471 } 472 473 // general commands without an assigned channel 474 switch(code) { 475 476 case CONNECTION_REQUEST: { 477 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 478 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 479 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 480 break; 481 } 482 483 case ECHO_REQUEST: { 484 // send back packet 485 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, len, &command[L2CAP_SIGNALING_COMMAND_DATA_OFFSET]); 486 break; 487 } 488 489 case INFORMATION_REQUEST: { 490 // we neither support connectionless L2CAP data nor support any flow control modes yet 491 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 492 if (infoType == 2) { 493 uint32_t features = 0; 494 // extended features request supported, however no features present 495 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, 4, &features); 496 } else { 497 // all other types are not supported 498 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 499 } 500 break;; 501 } 502 503 default: 504 break; 505 } 506 507 508 // Get potential destination CID 509 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 510 511 // Find channel for this sig_id and connection handle 512 linked_item_t *it; 513 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 514 l2cap_channel_t * channel = (l2cap_channel_t *) it; 515 if (channel->handle == handle) { 516 if (code & 1) { 517 // match odd commands by previous signaling identifier 518 if (channel->sig_id == sig_id) { 519 l2cap_signaling_handler_channel(channel, command); 520 } 521 } else { 522 // match even commands by local channel id 523 if (channel->local_cid == dest_cid) { 524 l2cap_signaling_handler_channel(channel, command); 525 } 526 } 527 } 528 } 529 } 530 531 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 532 533 // Capturing? 534 if (capture_connection) { 535 (*data_packet_handler)(capture_connection, 0, packet, size); 536 return; 537 } 538 539 // Get Channel ID 540 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 541 542 // Signaling Packet? 543 if (channel_id == 1) { 544 545 // Get Connection 546 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 547 548 uint16_t command_offset = 8; 549 while (command_offset < size) { 550 551 // handle signaling commands 552 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 553 554 // increment command_offset 555 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 556 } 557 return; 558 } 559 560 // Find channel for this channel_id and connection handle 561 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 562 if (channel) { 563 (*data_packet_handler)(channel->connection, channel_id, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 564 } 565 } 566 567 568 // finalize closed channel 569 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 570 channel->state = L2CAP_STATE_CLOSED; 571 l2cap_emit_channel_closed(channel); 572 573 // discard channel 574 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 575 free (channel); 576 } 577 578 l2cap_service_t * l2cap_get_service(uint16_t psm){ 579 linked_item_t *it; 580 581 // close open channels 582 for (it = (linked_item_t *) l2cap_services; it ; it = it->next){ 583 l2cap_service_t * service = ((l2cap_service_t *) it); 584 if ( service->psm == psm){ 585 return service; 586 }; 587 } 588 return NULL; 589 } 590 591 void l2cap_register_service_internal(connection_t *connection, uint16_t psm, uint16_t mtu){ 592 // check for alread registered psm // TODO: emit error event 593 l2cap_service_t *service = l2cap_get_service(psm); 594 if (service) return; 595 596 // alloc structure // TODO: emit error event 597 service = malloc(sizeof(l2cap_service_t)); 598 if (!service) return; 599 600 // fill in 601 service->psm = psm; 602 service->mtu = mtu; 603 service->connection = connection; 604 605 // add to services list 606 linked_list_add(&l2cap_services, (linked_item_t *) service); 607 } 608 609 void l2cap_unregister_service_internal(connection_t *connection, uint16_t psm){ 610 l2cap_service_t *service = l2cap_get_service(psm); 611 if (!service) return; 612 linked_list_remove(&l2cap_services, (linked_item_t *) service); 613 free(service); 614 } 615 616 // 617 void l2cap_close_connection(connection_t *connection){ 618 linked_item_t *it; 619 620 // close open channels 621 l2cap_channel_t * channel; 622 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 623 channel = (l2cap_channel_t *) it; 624 if (channel->connection == connection) { 625 channel->sig_id = l2cap_next_sig_id(); 626 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->remote_cid, channel->local_cid); 627 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 628 } 629 } 630 631 // unregister services 632 l2cap_service_t *service; 633 for (it = (linked_item_t *) l2cap_services; it ; ){ 634 service = (l2cap_service_t *) it->next; 635 if (service->connection == connection){ 636 it->next = service->item.next; 637 free(service); 638 } else { 639 it = it->next; 640 } 641 } 642 } 643 644 // notify client 645 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 646 uint8_t event[17]; 647 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 648 event[1] = sizeof(event) - 2; 649 event[2] = status; 650 bt_flip_addr(&event[3], channel->address); 651 bt_store_16(event, 9, channel->handle); 652 bt_store_16(event, 11, channel->psm); 653 bt_store_16(event, 13, channel->local_cid); 654 bt_store_16(event, 15, channel->remote_cid); 655 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 656 (*event_packet_handler)(channel->connection, event, sizeof(event)); 657 } 658 659 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 660 uint8_t event[4]; 661 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 662 event[1] = sizeof(event) - 2; 663 bt_store_16(event, 2, channel->local_cid); 664 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 665 (*event_packet_handler)(channel->connection, event, sizeof(event)); 666 } 667 668 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 669 uint8_t event[16]; 670 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 671 event[1] = sizeof(event) - 2; 672 bt_flip_addr(&event[2], channel->address); 673 bt_store_16(event, 8, channel->handle); 674 bt_store_16(event, 10, channel->psm); 675 bt_store_16(event, 12, channel->local_cid); 676 bt_store_16(event, 14, channel->remote_cid); 677 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 678 (*event_packet_handler)(channel->connection, event, sizeof(event)); 679 } 680 681 void l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 682 // find channel for local_cid, construct l2cap packet and send 683 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 684 if (channel) { 685 // 0 - Connection handle : PB=10 : BC=00 686 bt_store_16(acl_buffer, 0, channel->handle | (2 << 12) | (0 << 14)); 687 // 2 - ACL length 688 bt_store_16(acl_buffer, 2, len + 4); 689 // 4 - L2CAP packet length 690 bt_store_16(acl_buffer, 4, len + 0); 691 // 6 - L2CAP channel DEST 692 bt_store_16(acl_buffer, 6, channel->remote_cid); 693 // 8 - data 694 memcpy(&acl_buffer[8], data, len); 695 // send 696 hci_send_acl_packet(acl_buffer, len+8); 697 } 698 } 699 700 void l2cap_set_capture_connection(connection_t * connection){ 701 capture_connection = connection; 702 } 703 704