1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 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 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * l2cap.c 40 * 41 * Logical Link Control and Adaption Protocl (L2CAP) 42 * 43 * Created by Matthias Ringwald on 5/16/09. 44 */ 45 46 #include "l2cap.h" 47 #include "hci.h" 48 #include "hci_dump.h" 49 #include "debug.h" 50 #include "btstack_memory.h" 51 52 #include <stdarg.h> 53 #include <string.h> 54 55 #include <stdio.h> 56 57 // nr of buffered acl packets in outgoing queue to get max performance 58 #define NR_BUFFERED_ACL_PACKETS 3 59 60 // used to cache l2cap rejects, echo, and informational requests 61 #define NR_PENDING_SIGNALING_RESPONSES 3 62 63 // offsets for L2CAP SIGNALING COMMANDS 64 #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 65 #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 66 #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 67 #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 68 69 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 70 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 71 72 // used to cache l2cap rejects, echo, and informational requests 73 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 74 static int signaling_responses_pending; 75 76 static linked_list_t l2cap_channels; 77 static linked_list_t l2cap_services; 78 static linked_list_t l2cap_le_channels; 79 static linked_list_t l2cap_le_services; 80 static void (*packet_handler) (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 81 82 static btstack_packet_handler_t attribute_protocol_packet_handler; 83 static btstack_packet_handler_t security_protocol_packet_handler; 84 static btstack_packet_handler_t connectionless_channel_packet_handler; 85 static uint8_t require_security_level2_for_outgoing_sdp; 86 87 // prototypes 88 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 89 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 90 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 91 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 92 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 93 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 94 95 96 void l2cap_init(void){ 97 signaling_responses_pending = 0; 98 99 l2cap_channels = NULL; 100 l2cap_services = NULL; 101 l2cap_le_services = NULL; 102 l2cap_le_channels = NULL; 103 104 packet_handler = null_packet_handler; 105 attribute_protocol_packet_handler = NULL; 106 security_protocol_packet_handler = NULL; 107 connectionless_channel_packet_handler = NULL; 108 109 require_security_level2_for_outgoing_sdp = 0; 110 111 // 112 // register callback with HCI 113 // 114 hci_register_packet_handler(&l2cap_packet_handler); 115 hci_connectable_control(0); // no services yet 116 } 117 118 119 /** Register L2CAP packet handlers */ 120 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 121 } 122 void l2cap_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 123 packet_handler = handler; 124 } 125 126 // notify client/protocol handler 127 static void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 128 if (channel->packet_handler) { 129 (* (channel->packet_handler))(type, channel->local_cid, data, size); 130 } else { 131 (*packet_handler)(channel->connection, type, channel->local_cid, data, size); 132 } 133 } 134 135 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 136 log_info("L2CAP_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x local_mtu %u, remote_mtu %u, flush_timeout %u", 137 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 138 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 139 uint8_t event[23]; 140 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 141 event[1] = sizeof(event) - 2; 142 event[2] = status; 143 bt_flip_addr(&event[3], channel->address); 144 bt_store_16(event, 9, channel->handle); 145 bt_store_16(event, 11, channel->psm); 146 bt_store_16(event, 13, channel->local_cid); 147 bt_store_16(event, 15, channel->remote_cid); 148 bt_store_16(event, 17, channel->local_mtu); 149 bt_store_16(event, 19, channel->remote_mtu); 150 bt_store_16(event, 21, channel->flush_timeout); 151 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 152 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 153 } 154 155 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 156 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 157 uint8_t event[4]; 158 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 159 event[1] = sizeof(event) - 2; 160 bt_store_16(event, 2, channel->local_cid); 161 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 162 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 163 } 164 165 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 166 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 167 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 168 uint8_t event[16]; 169 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 170 event[1] = sizeof(event) - 2; 171 bt_flip_addr(&event[2], channel->address); 172 bt_store_16(event, 8, channel->handle); 173 bt_store_16(event, 10, channel->psm); 174 bt_store_16(event, 12, channel->local_cid); 175 bt_store_16(event, 14, channel->remote_cid); 176 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 177 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 178 } 179 180 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 181 uint8_t event[6]; 182 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 183 event[1] = 4; 184 bt_store_16(event, 2, handle); 185 bt_store_16(event, 4, result); 186 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 187 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 } 189 190 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 191 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 192 uint8_t event[5]; 193 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 194 event[1] = sizeof(event) - 2; 195 event[2] = status; 196 bt_store_16(event, 3, psm); 197 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 198 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 199 } 200 201 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 202 203 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 204 205 uint8_t event[5]; 206 event[0] = L2CAP_EVENT_CREDITS; 207 event[1] = sizeof(event) - 2; 208 bt_store_16(event, 2, channel->local_cid); 209 event[4] = credits; 210 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 211 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 212 } 213 214 static void l2cap_hand_out_credits(void){ 215 linked_list_iterator_t it; 216 linked_list_iterator_init(&it, &l2cap_channels); 217 while (linked_list_iterator_has_next(&it)){ 218 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 219 if (channel->state != L2CAP_STATE_OPEN) continue; 220 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 221 l2cap_emit_credits(channel, 1); 222 } 223 } 224 225 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 226 linked_list_iterator_t it; 227 linked_list_iterator_init(&it, &l2cap_channels); 228 while (linked_list_iterator_has_next(&it)){ 229 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 230 if ( channel->local_cid == local_cid) { 231 return channel; 232 } 233 } 234 return NULL; 235 } 236 237 int l2cap_can_send_packet_now(uint16_t local_cid){ 238 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 239 if (!channel) return 0; 240 return hci_can_send_acl_packet_now(channel->handle); 241 } 242 243 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 244 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 245 if (!channel) return 0; 246 return hci_can_send_prepared_acl_packet_now(channel->handle); 247 } 248 249 // @deprecated 250 int l2cap_can_send_connectionless_packet_now(void){ 251 // TODO provide real handle 252 return l2cap_can_send_fixed_channel_packet_now(0x1234); 253 } 254 255 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 256 return hci_can_send_acl_packet_now(handle); 257 } 258 259 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 260 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 261 if (channel) { 262 return channel->remote_mtu; 263 } 264 return 0; 265 } 266 267 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 268 linked_list_iterator_t it; 269 linked_list_iterator_init(&it, &l2cap_channels); 270 while (linked_list_iterator_has_next(&it)){ 271 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 272 if ( &channel->rtx == ts) { 273 return channel; 274 } 275 } 276 return NULL; 277 } 278 279 static void l2cap_rtx_timeout(timer_source_t * ts){ 280 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 281 if (!ts) return; 282 283 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 284 285 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 286 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 287 // notify client 288 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 289 290 // discard channel 291 // no need to stop timer here, it is removed from list during timer callback 292 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 293 btstack_memory_l2cap_channel_free(channel); 294 } 295 296 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 297 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 298 run_loop_remove_timer(&channel->rtx); 299 } 300 301 static void l2cap_start_rtx(l2cap_channel_t * channel){ 302 l2cap_stop_rtx(channel); 303 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 304 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 305 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 306 run_loop_add_timer(&channel->rtx); 307 } 308 309 static void l2cap_start_ertx(l2cap_channel_t * channel){ 310 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 311 l2cap_stop_rtx(channel); 312 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 313 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 314 run_loop_add_timer(&channel->rtx); 315 } 316 317 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 318 require_security_level2_for_outgoing_sdp = 1; 319 } 320 321 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 322 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 323 } 324 325 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 326 327 if (!hci_can_send_acl_packet_now(handle)){ 328 log_info("l2cap_send_signaling_packet, cannot send"); 329 return BTSTACK_ACL_BUFFERS_FULL; 330 } 331 332 // log_info("l2cap_send_signaling_packet type %u", cmd); 333 hci_reserve_packet_buffer(); 334 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 335 va_list argptr; 336 va_start(argptr, identifier); 337 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 338 va_end(argptr); 339 // log_info("l2cap_send_signaling_packet con %u!", handle); 340 return hci_send_acl_packet_buffer(len); 341 } 342 343 #ifdef HAVE_BLE 344 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 345 346 if (!hci_can_send_acl_packet_now(handle)){ 347 log_info("l2cap_send_signaling_packet, cannot send"); 348 return BTSTACK_ACL_BUFFERS_FULL; 349 } 350 351 // log_info("l2cap_send_signaling_packet type %u", cmd); 352 hci_reserve_packet_buffer(); 353 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 354 va_list argptr; 355 va_start(argptr, identifier); 356 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 357 va_end(argptr); 358 // log_info("l2cap_send_signaling_packet con %u!", handle); 359 return hci_send_acl_packet_buffer(len); 360 } 361 #endif 362 363 uint8_t *l2cap_get_outgoing_buffer(void){ 364 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 365 } 366 367 int l2cap_reserve_packet_buffer(void){ 368 return hci_reserve_packet_buffer(); 369 } 370 371 void l2cap_release_packet_buffer(void){ 372 hci_release_packet_buffer(); 373 } 374 375 376 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 377 378 if (!hci_is_packet_buffer_reserved()){ 379 log_error("l2cap_send_prepared called without reserving packet first"); 380 return BTSTACK_ACL_BUFFERS_FULL; 381 } 382 383 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 384 if (!channel) { 385 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 386 return -1; // TODO: define error 387 } 388 389 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 390 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 391 return BTSTACK_ACL_BUFFERS_FULL; 392 } 393 394 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 395 396 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 397 398 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 399 400 // 0 - Connection handle : PB=pb : BC=00 401 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 402 // 2 - ACL length 403 bt_store_16(acl_buffer, 2, len + 4); 404 // 4 - L2CAP packet length 405 bt_store_16(acl_buffer, 4, len + 0); 406 // 6 - L2CAP channel DEST 407 bt_store_16(acl_buffer, 6, channel->remote_cid); 408 // send 409 int err = hci_send_acl_packet_buffer(len+8); 410 411 l2cap_hand_out_credits(); 412 413 return err; 414 } 415 416 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 417 418 if (!hci_is_packet_buffer_reserved()){ 419 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 420 return BTSTACK_ACL_BUFFERS_FULL; 421 } 422 423 if (!hci_can_send_prepared_acl_packet_now(handle)){ 424 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 425 return BTSTACK_ACL_BUFFERS_FULL; 426 } 427 428 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 429 430 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 431 432 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 433 434 // 0 - Connection handle : PB=pb : BC=00 435 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 436 // 2 - ACL length 437 bt_store_16(acl_buffer, 2, len + 4); 438 // 4 - L2CAP packet length 439 bt_store_16(acl_buffer, 4, len + 0); 440 // 6 - L2CAP channel DEST 441 bt_store_16(acl_buffer, 6, cid); 442 // send 443 int err = hci_send_acl_packet_buffer(len+8); 444 445 l2cap_hand_out_credits(); 446 447 return err; 448 } 449 450 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 451 452 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 453 if (!channel) { 454 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 455 return -1; // TODO: define error 456 } 457 458 if (len > channel->remote_mtu){ 459 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 460 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 461 } 462 463 if (!hci_can_send_acl_packet_now(channel->handle)){ 464 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 465 return BTSTACK_ACL_BUFFERS_FULL; 466 } 467 468 hci_reserve_packet_buffer(); 469 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 470 471 memcpy(&acl_buffer[8], data, len); 472 473 return l2cap_send_prepared(local_cid, len); 474 } 475 476 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 477 478 if (!hci_can_send_acl_packet_now(handle)){ 479 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 480 return BTSTACK_ACL_BUFFERS_FULL; 481 } 482 483 hci_reserve_packet_buffer(); 484 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 485 486 memcpy(&acl_buffer[8], data, len); 487 488 return l2cap_send_prepared_connectionless(handle, cid, len); 489 } 490 491 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 492 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 493 } 494 495 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 496 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 497 } 498 499 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 500 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 501 } 502 503 504 505 // MARK: L2CAP_RUN 506 // process outstanding signaling tasks 507 static void l2cap_run(void){ 508 509 // log_info("l2cap_run: entered"); 510 511 // check pending signaling responses 512 while (signaling_responses_pending){ 513 514 hci_con_handle_t handle = signaling_responses[0].handle; 515 516 if (!hci_can_send_acl_packet_now(handle)) break; 517 518 uint8_t sig_id = signaling_responses[0].sig_id; 519 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 520 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 521 uint8_t response_code = signaling_responses[0].code; 522 523 // remove first item before sending (to avoid sending response mutliple times) 524 signaling_responses_pending--; 525 int i; 526 for (i=0; i < signaling_responses_pending; i++){ 527 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 528 } 529 530 switch (response_code){ 531 case CONNECTION_REQUEST: 532 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 533 // also disconnect if result is 0x0003 - security blocked 534 if (result == 0x0003){ 535 hci_disconnect_security_block(handle); 536 } 537 break; 538 case ECHO_REQUEST: 539 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 540 break; 541 case INFORMATION_REQUEST: 542 switch (infoType){ 543 case 1: { // Connectionless MTU 544 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 545 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 546 break; 547 } 548 case 2: { // Extended Features Supported 549 // extended features request supported, features: fixed channels, unicast connectionless data reception 550 uint32_t features = 0x280; 551 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 552 break; 553 } 554 case 3: { // Fixed Channels Supported 555 uint8_t map[8]; 556 memset(map, 0, 8); 557 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 558 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 559 break; 560 } 561 default: 562 // all other types are not supported 563 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 564 break; 565 } 566 break; 567 case COMMAND_REJECT: 568 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 569 #ifdef HAVE_BLE 570 case COMMAND_REJECT_LE: 571 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 572 break; 573 #endif 574 default: 575 // should not happen 576 break; 577 } 578 } 579 580 uint8_t config_options[4]; 581 linked_list_iterator_t it; 582 linked_list_iterator_init(&it, &l2cap_channels); 583 while (linked_list_iterator_has_next(&it)){ 584 585 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 586 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 587 switch (channel->state){ 588 589 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 590 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 591 if (!hci_can_send_acl_packet_now(channel->handle)) break; 592 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 593 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 594 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 595 } 596 break; 597 598 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 599 if (!hci_can_send_command_packet_now()) break; 600 // send connection request - set state first 601 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 602 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 603 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 604 break; 605 606 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 607 if (!hci_can_send_acl_packet_now(channel->handle)) break; 608 channel->state = L2CAP_STATE_INVALID; 609 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 610 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 611 l2cap_stop_rtx(channel); 612 linked_list_iterator_remove(&it); 613 btstack_memory_l2cap_channel_free(channel); 614 break; 615 616 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 617 if (!hci_can_send_acl_packet_now(channel->handle)) break; 618 channel->state = L2CAP_STATE_CONFIG; 619 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 620 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 621 break; 622 623 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 624 if (!hci_can_send_acl_packet_now(channel->handle)) break; 625 // success, start l2cap handshake 626 channel->local_sig_id = l2cap_next_sig_id(); 627 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 628 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 629 l2cap_start_rtx(channel); 630 break; 631 632 case L2CAP_STATE_CONFIG: 633 if (!hci_can_send_acl_packet_now(channel->handle)) break; 634 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 635 uint16_t flags = 0; 636 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 637 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 638 flags = 1; 639 } else { 640 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 641 } 642 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 643 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 644 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 645 config_options[0] = 1; // MTU 646 config_options[1] = 2; // len param 647 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 648 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 649 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 650 } else { 651 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 652 } 653 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 654 } 655 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 656 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 657 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 658 channel->local_sig_id = l2cap_next_sig_id(); 659 config_options[0] = 1; // MTU 660 config_options[1] = 2; // len param 661 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 662 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 663 l2cap_start_rtx(channel); 664 } 665 if (l2cap_channel_ready_for_open(channel)){ 666 channel->state = L2CAP_STATE_OPEN; 667 l2cap_emit_channel_opened(channel, 0); // success 668 l2cap_emit_credits(channel, 1); 669 } 670 break; 671 672 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 673 if (!hci_can_send_acl_packet_now(channel->handle)) break; 674 channel->state = L2CAP_STATE_INVALID; 675 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 676 // we don't start an RTX timer for a disconnect - there's no point in closing the channel if the other side doesn't respond :) 677 l2cap_finialize_channel_close(channel); // -- remove from list 678 break; 679 680 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 681 if (!hci_can_send_acl_packet_now(channel->handle)) break; 682 channel->local_sig_id = l2cap_next_sig_id(); 683 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 684 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 685 break; 686 default: 687 break; 688 } 689 } 690 691 #ifdef HAVE_BLE 692 // send l2cap con paramter update if necessary 693 hci_connections_get_iterator(&it); 694 while(linked_list_iterator_has_next(&it)){ 695 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 696 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 697 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 698 switch (connection->le_con_parameter_update_state){ 699 case CON_PARAMETER_UPDATE_SEND_REQUEST: 700 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 701 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 702 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 703 break; 704 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 705 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 706 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 707 break; 708 case CON_PARAMETER_UPDATE_DENY: 709 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 710 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 711 break; 712 default: 713 break; 714 } 715 } 716 #endif 717 718 // log_info("l2cap_run: exit"); 719 } 720 721 uint16_t l2cap_max_mtu(void){ 722 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 723 } 724 725 uint16_t l2cap_max_le_mtu(void){ 726 return l2cap_max_mtu(); 727 } 728 729 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 730 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 731 log_info("l2cap_handle_connection_complete expected state"); 732 // success, start l2cap handshake 733 channel->handle = handle; 734 channel->local_cid = l2cap_next_local_cid(); 735 // check remote SSP feature first 736 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 737 } 738 } 739 740 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 741 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 742 743 // we have been waiting for remote supported features, if both support SSP, 744 log_info("l2cap received remote supported features, sec_level_0_allowed for psm %u = %u", channel->psm, l2cap_security_level_0_allowed_for_PSM(channel->psm)); 745 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 746 // request security level 2 747 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 748 gap_request_security_level(channel->handle, LEVEL_2); 749 return; 750 } 751 // fine, go ahead 752 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 753 } 754 755 // open outgoing L2CAP channel 756 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t channel_packet_handler, 757 bd_addr_t address, uint16_t psm, uint16_t mtu){ 758 759 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 760 761 // alloc structure 762 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 763 if (!chan) { 764 // emit error event 765 l2cap_channel_t dummy_channel; 766 BD_ADDR_COPY(dummy_channel.address, address); 767 dummy_channel.psm = psm; 768 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 769 return; 770 } 771 // Init memory (make valgrind happy) 772 memset(chan, 0, sizeof(l2cap_channel_t)); 773 // limit local mtu to max acl packet length - l2cap header 774 if (mtu > l2cap_max_mtu()) { 775 mtu = l2cap_max_mtu(); 776 } 777 778 // fill in 779 BD_ADDR_COPY(chan->address, address); 780 chan->psm = psm; 781 chan->handle = 0; 782 chan->connection = connection; 783 chan->packet_handler = channel_packet_handler; 784 chan->remote_mtu = L2CAP_MINIMAL_MTU; 785 chan->local_mtu = mtu; 786 787 // set initial state 788 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 789 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 790 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 791 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 792 chan->required_security_level = LEVEL_0; 793 794 // add to connections list 795 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 796 797 // check if hci connection is already usable 798 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 799 if (conn){ 800 log_info("l2cap_create_channel_internal, hci connection already exists"); 801 l2cap_handle_connection_complete(conn->con_handle, chan); 802 // check if remote supported fearures are already received 803 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 804 l2cap_handle_remote_supported_features_received(chan); 805 } 806 } 807 808 l2cap_run(); 809 } 810 811 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 812 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 813 // find channel for local_cid 814 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 815 if (channel) { 816 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 817 } 818 // process 819 l2cap_run(); 820 } 821 822 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 823 linked_list_iterator_t it; 824 linked_list_iterator_init(&it, &l2cap_channels); 825 while (linked_list_iterator_has_next(&it)){ 826 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 827 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 828 // channel for this address found 829 switch (channel->state){ 830 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 831 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 832 // failure, forward error code 833 l2cap_emit_channel_opened(channel, status); 834 // discard channel 835 l2cap_stop_rtx(channel); 836 linked_list_iterator_remove(&it); 837 btstack_memory_l2cap_channel_free(channel); 838 break; 839 default: 840 break; 841 } 842 } 843 } 844 845 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 846 linked_list_iterator_t it; 847 linked_list_iterator_init(&it, &l2cap_channels); 848 while (linked_list_iterator_has_next(&it)){ 849 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 850 if ( ! BD_ADDR_CMP( channel->address, address) ){ 851 l2cap_handle_connection_complete(handle, channel); 852 } 853 } 854 // process 855 l2cap_run(); 856 } 857 858 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 859 860 bd_addr_t address; 861 hci_con_handle_t handle; 862 linked_list_iterator_t it; 863 int hci_con_used; 864 865 switch(packet[0]){ 866 867 // handle connection complete events 868 case HCI_EVENT_CONNECTION_COMPLETE: 869 bt_flip_addr(address, &packet[5]); 870 if (packet[2] == 0){ 871 handle = READ_BT_16(packet, 3); 872 l2cap_handle_connection_success_for_addr(address, handle); 873 } else { 874 l2cap_handle_connection_failed_for_addr(address, packet[2]); 875 } 876 break; 877 878 // handle successful create connection cancel command 879 case HCI_EVENT_COMMAND_COMPLETE: 880 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 881 if (packet[5] == 0){ 882 bt_flip_addr(address, &packet[6]); 883 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 884 l2cap_handle_connection_failed_for_addr(address, 0x16); 885 } 886 } 887 l2cap_run(); // try sending signaling packets first 888 break; 889 890 case HCI_EVENT_COMMAND_STATUS: 891 l2cap_run(); // try sending signaling packets first 892 break; 893 894 // handle disconnection complete events 895 case HCI_EVENT_DISCONNECTION_COMPLETE: 896 // send l2cap disconnect events for all channels on this handle and free them 897 handle = READ_BT_16(packet, 3); 898 linked_list_iterator_init(&it, &l2cap_channels); 899 while (linked_list_iterator_has_next(&it)){ 900 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 901 if (channel->handle != handle) continue; 902 l2cap_emit_channel_closed(channel); 903 l2cap_stop_rtx(channel); 904 linked_list_iterator_remove(&it); 905 btstack_memory_l2cap_channel_free(channel); 906 } 907 break; 908 909 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 910 l2cap_run(); // try sending signaling packets first 911 l2cap_hand_out_credits(); 912 break; 913 914 // HCI Connection Timeouts 915 case L2CAP_EVENT_TIMEOUT_CHECK: 916 handle = READ_BT_16(packet, 2); 917 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 918 if (hci_authentication_active_for_handle(handle)) break; 919 hci_con_used = 0; 920 linked_list_iterator_init(&it, &l2cap_channels); 921 while (linked_list_iterator_has_next(&it)){ 922 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 923 if (channel->handle != handle) continue; 924 hci_con_used = 1; 925 break; 926 } 927 if (hci_con_used) break; 928 if (!hci_can_send_command_packet_now()) break; 929 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 930 break; 931 932 case DAEMON_EVENT_HCI_PACKET_SENT: 933 l2cap_run(); // try sending signaling packets first 934 l2cap_hand_out_credits(); 935 936 linked_list_iterator_init(&it, &l2cap_channels); 937 while (linked_list_iterator_has_next(&it)){ 938 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 939 if (!channel->packet_handler) continue; 940 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 941 } 942 if (attribute_protocol_packet_handler) { 943 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 944 } 945 if (security_protocol_packet_handler) { 946 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 947 } 948 if (connectionless_channel_packet_handler) { 949 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 950 } 951 break; 952 953 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 954 handle = READ_BT_16(packet, 3); 955 linked_list_iterator_init(&it, &l2cap_channels); 956 while (linked_list_iterator_has_next(&it)){ 957 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 958 if (channel->handle != handle) continue; 959 l2cap_handle_remote_supported_features_received(channel); 960 break; 961 } 962 break; 963 964 case GAP_SECURITY_LEVEL: 965 handle = READ_BT_16(packet, 2); 966 log_info("l2cap - security level update"); 967 linked_list_iterator_init(&it, &l2cap_channels); 968 while (linked_list_iterator_has_next(&it)){ 969 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 970 if (channel->handle != handle) continue; 971 972 log_info("l2cap - state %u", channel->state); 973 974 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 975 gap_security_level_t required_level = channel->required_security_level; 976 977 switch (channel->state){ 978 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 979 if (actual_level >= required_level){ 980 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 981 l2cap_emit_connection_request(channel); 982 } else { 983 channel->reason = 0x0003; // security block 984 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 985 } 986 break; 987 988 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 989 if (actual_level >= required_level){ 990 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 991 } else { 992 // disconnnect, authentication not good enough 993 hci_disconnect_security_block(handle); 994 } 995 break; 996 997 default: 998 break; 999 } 1000 } 1001 break; 1002 1003 default: 1004 break; 1005 } 1006 1007 // pass on: main packet handler, att and sm packet handlers 1008 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1009 if (attribute_protocol_packet_handler){ 1010 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1011 } 1012 if (security_protocol_packet_handler) { 1013 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1014 } 1015 if (connectionless_channel_packet_handler) { 1016 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1017 } 1018 1019 l2cap_run(); 1020 } 1021 1022 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1023 channel->remote_sig_id = identifier; 1024 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1025 l2cap_run(); 1026 } 1027 1028 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1029 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1030 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1031 signaling_responses[signaling_responses_pending].handle = handle; 1032 signaling_responses[signaling_responses_pending].code = code; 1033 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1034 signaling_responses[signaling_responses_pending].data = data; 1035 signaling_responses_pending++; 1036 l2cap_run(); 1037 } 1038 } 1039 1040 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1041 1042 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1043 l2cap_service_t *service = l2cap_get_service(psm); 1044 if (!service) { 1045 // 0x0002 PSM not supported 1046 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1047 return; 1048 } 1049 1050 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1051 if (!hci_connection) { 1052 // 1053 log_error("no hci_connection for handle %u", handle); 1054 return; 1055 } 1056 1057 // alloc structure 1058 // log_info("l2cap_handle_connection_request register channel"); 1059 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1060 if (!channel){ 1061 // 0x0004 No resources available 1062 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1063 return; 1064 } 1065 // Init memory (make valgrind happy) 1066 memset(channel, 0, sizeof(l2cap_channel_t)); 1067 // fill in 1068 BD_ADDR_COPY(channel->address, hci_connection->address); 1069 channel->psm = psm; 1070 channel->handle = handle; 1071 channel->connection = service->connection; 1072 channel->packet_handler = service->packet_handler; 1073 channel->local_cid = l2cap_next_local_cid(); 1074 channel->remote_cid = source_cid; 1075 channel->local_mtu = service->mtu; 1076 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1077 channel->remote_sig_id = sig_id; 1078 channel->required_security_level = service->required_security_level; 1079 1080 // limit local mtu to max acl packet length - l2cap header 1081 if (channel->local_mtu > l2cap_max_mtu()) { 1082 channel->local_mtu = l2cap_max_mtu(); 1083 } 1084 1085 // set initial state 1086 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1087 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1088 1089 // add to connections list 1090 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1091 1092 // assert security requirements 1093 gap_request_security_level(handle, channel->required_security_level); 1094 } 1095 1096 void l2cap_accept_connection_internal(uint16_t local_cid){ 1097 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1098 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1099 if (!channel) { 1100 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1101 return; 1102 } 1103 1104 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1105 1106 // process 1107 l2cap_run(); 1108 } 1109 1110 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1111 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1112 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1113 if (!channel) { 1114 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1115 return; 1116 } 1117 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1118 channel->reason = reason; 1119 l2cap_run(); 1120 } 1121 1122 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1123 1124 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1125 1126 uint16_t flags = READ_BT_16(command, 6); 1127 if (flags & 1) { 1128 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1129 } 1130 1131 // accept the other's configuration options 1132 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1133 uint16_t pos = 8; 1134 while (pos < end_pos){ 1135 uint8_t option_hint = command[pos] >> 7; 1136 uint8_t option_type = command[pos] & 0x7f; 1137 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1138 pos++; 1139 uint8_t length = command[pos++]; 1140 // MTU { type(8): 1, len(8):2, MTU(16) } 1141 if (option_type == 1 && length == 2){ 1142 channel->remote_mtu = READ_BT_16(command, pos); 1143 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1144 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1145 } 1146 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1147 if (option_type == 2 && length == 2){ 1148 channel->flush_timeout = READ_BT_16(command, pos); 1149 } 1150 // check for unknown options 1151 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1152 log_info("l2cap cid %u, unknown options", channel->local_cid); 1153 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1154 } 1155 pos += length; 1156 } 1157 } 1158 1159 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1160 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1161 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1162 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1163 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1164 if (channel->state == L2CAP_STATE_OPEN) return 0; 1165 return 1; 1166 } 1167 1168 1169 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1170 1171 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1172 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1173 uint16_t result = 0; 1174 1175 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1176 1177 // handle DISCONNECT REQUESTS seperately 1178 if (code == DISCONNECTION_REQUEST){ 1179 switch (channel->state){ 1180 case L2CAP_STATE_CONFIG: 1181 case L2CAP_STATE_OPEN: 1182 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1183 case L2CAP_STATE_WAIT_DISCONNECT: 1184 l2cap_handle_disconnect_request(channel, identifier); 1185 break; 1186 1187 default: 1188 // ignore in other states 1189 break; 1190 } 1191 return; 1192 } 1193 1194 // @STATEMACHINE(l2cap) 1195 switch (channel->state) { 1196 1197 case L2CAP_STATE_WAIT_CONNECT_RSP: 1198 switch (code){ 1199 case CONNECTION_RESPONSE: 1200 l2cap_stop_rtx(channel); 1201 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1202 switch (result) { 1203 case 0: 1204 // successful connection 1205 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1206 channel->state = L2CAP_STATE_CONFIG; 1207 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1208 break; 1209 case 1: 1210 // connection pending. get some coffee, but start the ERTX 1211 l2cap_start_ertx(channel); 1212 break; 1213 default: 1214 // channel closed 1215 channel->state = L2CAP_STATE_CLOSED; 1216 // map l2cap connection response result to BTstack status enumeration 1217 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1218 1219 // drop link key if security block 1220 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1221 hci_drop_link_key_for_bd_addr(channel->address); 1222 } 1223 1224 // discard channel 1225 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1226 btstack_memory_l2cap_channel_free(channel); 1227 break; 1228 } 1229 break; 1230 1231 default: 1232 //@TODO: implement other signaling packets 1233 break; 1234 } 1235 break; 1236 1237 case L2CAP_STATE_CONFIG: 1238 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1239 switch (code) { 1240 case CONFIGURE_REQUEST: 1241 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1242 l2cap_signaling_handle_configure_request(channel, command); 1243 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1244 // only done if continuation not set 1245 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1246 } 1247 break; 1248 case CONFIGURE_RESPONSE: 1249 l2cap_stop_rtx(channel); 1250 switch (result){ 1251 case 0: // success 1252 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1253 break; 1254 case 4: // pending 1255 l2cap_start_ertx(channel); 1256 break; 1257 default: 1258 // retry on negative result 1259 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1260 break; 1261 } 1262 break; 1263 default: 1264 break; 1265 } 1266 if (l2cap_channel_ready_for_open(channel)){ 1267 // for open: 1268 channel->state = L2CAP_STATE_OPEN; 1269 l2cap_emit_channel_opened(channel, 0); 1270 l2cap_emit_credits(channel, 1); 1271 } 1272 break; 1273 1274 case L2CAP_STATE_WAIT_DISCONNECT: 1275 switch (code) { 1276 case DISCONNECTION_RESPONSE: 1277 l2cap_finialize_channel_close(channel); 1278 break; 1279 default: 1280 //@TODO: implement other signaling packets 1281 break; 1282 } 1283 break; 1284 1285 case L2CAP_STATE_CLOSED: 1286 // @TODO handle incoming requests 1287 break; 1288 1289 case L2CAP_STATE_OPEN: 1290 //@TODO: implement other signaling packets, e.g. re-configure 1291 break; 1292 default: 1293 break; 1294 } 1295 // log_info("new state %u", channel->state); 1296 } 1297 1298 1299 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1300 1301 // get code, signalind identifier and command len 1302 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1303 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1304 1305 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1306 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1307 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1308 return; 1309 } 1310 1311 // general commands without an assigned channel 1312 switch(code) { 1313 1314 case CONNECTION_REQUEST: { 1315 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1316 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1317 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1318 return; 1319 } 1320 1321 case ECHO_REQUEST: 1322 l2cap_register_signaling_response(handle, code, sig_id, 0); 1323 return; 1324 1325 case INFORMATION_REQUEST: { 1326 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1327 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1328 return; 1329 } 1330 1331 default: 1332 break; 1333 } 1334 1335 1336 // Get potential destination CID 1337 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1338 1339 // Find channel for this sig_id and connection handle 1340 linked_list_iterator_t it; 1341 linked_list_iterator_init(&it, &l2cap_channels); 1342 while (linked_list_iterator_has_next(&it)){ 1343 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1344 if (channel->handle != handle) continue; 1345 if (code & 1) { 1346 // match odd commands (responses) by previous signaling identifier 1347 if (channel->local_sig_id == sig_id) { 1348 l2cap_signaling_handler_channel(channel, command); 1349 break; 1350 } 1351 } else { 1352 // match even commands (requests) by local channel id 1353 if (channel->local_cid == dest_cid) { 1354 l2cap_signaling_handler_channel(channel, command); 1355 break; 1356 } 1357 } 1358 } 1359 } 1360 1361 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1362 1363 // Get Channel ID 1364 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1365 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1366 1367 switch (channel_id) { 1368 1369 case L2CAP_CID_SIGNALING: { 1370 1371 uint16_t command_offset = 8; 1372 while (command_offset < size) { 1373 1374 // handle signaling commands 1375 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1376 1377 // increment command_offset 1378 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1379 } 1380 break; 1381 } 1382 1383 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1384 if (attribute_protocol_packet_handler) { 1385 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1386 } 1387 break; 1388 1389 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1390 if (security_protocol_packet_handler) { 1391 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1392 } 1393 break; 1394 1395 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1396 if (connectionless_channel_packet_handler) { 1397 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1398 } 1399 break; 1400 1401 case L2CAP_CID_SIGNALING_LE: { 1402 switch (packet[8]){ 1403 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1404 uint16_t result = READ_BT_16(packet, 12); 1405 l2cap_emit_connection_parameter_update_response(handle, result); 1406 break; 1407 } 1408 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1409 uint8_t event[10]; 1410 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1411 event[1] = 8; 1412 memcpy(&event[2], &packet[12], 8); 1413 1414 hci_connection_t * connection = hci_connection_for_handle(handle); 1415 if (connection){ 1416 if (connection->role != HCI_ROLE_MASTER){ 1417 // reject command without notifying upper layer when not in master role 1418 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1419 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1420 break; 1421 } 1422 int update_parameter = 1; 1423 le_connection_parameter_range_t existing_range; 1424 gap_le_get_connection_parameter_range(existing_range); 1425 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1426 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1427 uint16_t le_conn_latency = READ_BT_16(packet,16); 1428 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1429 1430 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1431 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1432 1433 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1434 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1435 1436 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1437 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1438 1439 if (update_parameter){ 1440 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1441 connection->le_conn_interval_min = le_conn_interval_min; 1442 connection->le_conn_interval_max = le_conn_interval_max; 1443 connection->le_conn_latency = le_conn_latency; 1444 connection->le_supervision_timeout = le_supervision_timeout; 1445 } else { 1446 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1447 } 1448 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1449 } 1450 1451 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1452 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1453 1454 break; 1455 } 1456 default: { 1457 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1458 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1459 break; 1460 } 1461 } 1462 break; 1463 } 1464 1465 default: { 1466 // Find channel for this channel_id and connection handle 1467 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1468 if (channel) { 1469 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1470 } 1471 break; 1472 } 1473 } 1474 } 1475 1476 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1477 switch (packet_type) { 1478 case HCI_EVENT_PACKET: 1479 l2cap_event_handler(packet, size); 1480 break; 1481 case HCI_ACL_DATA_PACKET: 1482 l2cap_acl_handler(packet, size); 1483 break; 1484 default: 1485 break; 1486 } 1487 l2cap_run(); 1488 } 1489 1490 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1491 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1492 channel->state = L2CAP_STATE_CLOSED; 1493 l2cap_emit_channel_closed(channel); 1494 // discard channel 1495 l2cap_stop_rtx(channel); 1496 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1497 btstack_memory_l2cap_channel_free(channel); 1498 } 1499 1500 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1501 linked_list_iterator_t it; 1502 linked_list_iterator_init(&it, services); 1503 while (linked_list_iterator_has_next(&it)){ 1504 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1505 if ( service->psm == psm){ 1506 return service; 1507 }; 1508 } 1509 return NULL; 1510 } 1511 1512 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1513 return l2cap_get_service_internal(&l2cap_services, psm); 1514 } 1515 1516 void l2cap_register_service_internal(void *connection, btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1517 1518 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1519 1520 // check for alread registered psm 1521 // TODO: emit error event 1522 l2cap_service_t *service = l2cap_get_service(psm); 1523 if (service) { 1524 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1525 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1526 return; 1527 } 1528 1529 // alloc structure 1530 // TODO: emit error event 1531 service = btstack_memory_l2cap_service_get(); 1532 if (!service) { 1533 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1534 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1535 return; 1536 } 1537 1538 // fill in 1539 service->psm = psm; 1540 service->mtu = mtu; 1541 service->connection = connection; 1542 service->packet_handler = service_packet_handler; 1543 service->required_security_level = security_level; 1544 1545 // add to services list 1546 linked_list_add(&l2cap_services, (linked_item_t *) service); 1547 1548 // enable page scan 1549 hci_connectable_control(1); 1550 1551 // done 1552 l2cap_emit_service_registered(connection, 0, psm); 1553 } 1554 1555 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1556 1557 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1558 1559 l2cap_service_t *service = l2cap_get_service(psm); 1560 if (!service) return; 1561 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1562 btstack_memory_l2cap_service_free(service); 1563 1564 // disable page scan when no services registered 1565 if (!linked_list_empty(&l2cap_services)) return; 1566 hci_connectable_control(0); 1567 } 1568 1569 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1570 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1571 switch(channel_id){ 1572 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1573 attribute_protocol_packet_handler = the_packet_handler; 1574 break; 1575 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1576 security_protocol_packet_handler = the_packet_handler; 1577 break; 1578 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1579 connectionless_channel_packet_handler = the_packet_handler; 1580 break; 1581 } 1582 } 1583 1584 #ifdef HAVE_BLE 1585 1586 1587 #if 0 1588 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1589 return l2cap_get_service_internal(&l2cap_le_services, psm); 1590 } 1591 /** 1592 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1593 * @param 1594 */ 1595 void l2cap_le_register_service_internal(void * connection, btstack_packet_handler_t packet_handler, uint16_t psm, 1596 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1597 1598 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1599 1600 // check for alread registered psm 1601 // TODO: emit error event 1602 l2cap_service_t *service = l2cap_le_get_service(psm); 1603 if (service) { 1604 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1605 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1606 return; 1607 } 1608 1609 // alloc structure 1610 // TODO: emit error event 1611 service = btstack_memory_l2cap_service_get(); 1612 if (!service) { 1613 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1614 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1615 return; 1616 } 1617 1618 // fill in 1619 service->psm = psm; 1620 service->mtu = mtu; 1621 service->mps = mps; 1622 service->connection = connection; 1623 service->packet_handler = packet_handler; 1624 service->required_security_level = security_level; 1625 1626 // add to services list 1627 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1628 1629 // done 1630 l2cap_emit_service_registered(connection, 0, psm); 1631 } 1632 1633 void l2cap_le_unregister_service_internal(void * connection, uint16_t psm) { 1634 1635 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1636 1637 l2cap_service_t *service = l2cap_le_get_service(psm); 1638 if (!service) return; 1639 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1640 btstack_memory_l2cap_service_free(service); 1641 } 1642 #endif 1643 #endif 1644