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 "btstack_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(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 70 71 // used to cache l2cap rejects, echo, and informational requests 72 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 73 static int signaling_responses_pending; 74 75 static btstack_packet_callback_registration_t hci_event_callback_registration; 76 77 static btstack_linked_list_t l2cap_channels; 78 static btstack_linked_list_t l2cap_services; 79 static btstack_linked_list_t l2cap_le_channels; 80 static btstack_linked_list_t l2cap_le_services; 81 static void (*packet_handler) (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 82 83 static btstack_packet_handler_t attribute_protocol_packet_handler; 84 static btstack_packet_handler_t security_protocol_packet_handler; 85 static btstack_packet_handler_t connectionless_channel_packet_handler; 86 static uint8_t require_security_level2_for_outgoing_sdp; 87 88 // prototypes 89 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 90 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 91 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 92 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 93 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 94 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 95 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 96 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ); 97 98 99 void l2cap_init(void){ 100 signaling_responses_pending = 0; 101 102 l2cap_channels = NULL; 103 l2cap_services = NULL; 104 l2cap_le_services = NULL; 105 l2cap_le_channels = NULL; 106 107 packet_handler = null_packet_handler; 108 attribute_protocol_packet_handler = NULL; 109 security_protocol_packet_handler = NULL; 110 connectionless_channel_packet_handler = NULL; 111 112 require_security_level2_for_outgoing_sdp = 0; 113 114 // 115 // register callback with HCI 116 // 117 hci_event_callback_registration.callback = &l2cap_hci_event_handler; 118 hci_add_event_handler(&hci_event_callback_registration); 119 120 hci_register_acl_packet_handler(&l2cap_acl_handler); 121 122 hci_connectable_control(0); // no services yet 123 } 124 125 126 /** Register L2CAP packet handlers */ 127 static void null_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 128 } 129 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 130 packet_handler = handler; 131 } 132 133 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 134 (* (channel->packet_handler))(type, channel->local_cid, data, size); 135 } 136 137 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 138 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", 139 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 140 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 141 uint8_t event[23]; 142 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 143 event[1] = sizeof(event) - 2; 144 event[2] = status; 145 bt_flip_addr(&event[3], channel->address); 146 little_endian_store_16(event, 9, channel->handle); 147 little_endian_store_16(event, 11, channel->psm); 148 little_endian_store_16(event, 13, channel->local_cid); 149 little_endian_store_16(event, 15, channel->remote_cid); 150 little_endian_store_16(event, 17, channel->local_mtu); 151 little_endian_store_16(event, 19, channel->remote_mtu); 152 little_endian_store_16(event, 21, channel->flush_timeout); 153 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 154 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 155 } 156 157 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 158 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 159 uint8_t event[4]; 160 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 161 event[1] = sizeof(event) - 2; 162 little_endian_store_16(event, 2, channel->local_cid); 163 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 164 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 165 } 166 167 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 168 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 169 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 170 uint8_t event[16]; 171 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 172 event[1] = sizeof(event) - 2; 173 bt_flip_addr(&event[2], channel->address); 174 little_endian_store_16(event, 8, channel->handle); 175 little_endian_store_16(event, 10, channel->psm); 176 little_endian_store_16(event, 12, channel->local_cid); 177 little_endian_store_16(event, 14, channel->remote_cid); 178 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 179 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 180 } 181 182 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 183 uint8_t event[6]; 184 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 185 event[1] = 4; 186 little_endian_store_16(event, 2, handle); 187 little_endian_store_16(event, 4, result); 188 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 189 (*packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 190 } 191 192 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 193 btstack_linked_list_iterator_t it; 194 btstack_linked_list_iterator_init(&it, &l2cap_channels); 195 while (btstack_linked_list_iterator_has_next(&it)){ 196 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 197 if ( channel->local_cid == local_cid) { 198 return channel; 199 } 200 } 201 return NULL; 202 } 203 204 int l2cap_can_send_packet_now(uint16_t local_cid){ 205 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 206 if (!channel) return 0; 207 return hci_can_send_acl_packet_now(channel->handle); 208 } 209 210 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 211 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 212 if (!channel) return 0; 213 return hci_can_send_prepared_acl_packet_now(channel->handle); 214 } 215 216 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 217 return hci_can_send_acl_packet_now(handle); 218 } 219 220 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 221 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 222 if (channel) { 223 return channel->remote_mtu; 224 } 225 return 0; 226 } 227 228 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 229 btstack_linked_list_iterator_t it; 230 btstack_linked_list_iterator_init(&it, &l2cap_channels); 231 while (btstack_linked_list_iterator_has_next(&it)){ 232 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 233 if ( &channel->rtx == ts) { 234 return channel; 235 } 236 } 237 return NULL; 238 } 239 240 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 241 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 242 if (!ts) return; 243 244 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 245 246 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 247 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 248 // notify client 249 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 250 251 // discard channel 252 // no need to stop timer here, it is removed from list during timer callback 253 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 254 btstack_memory_l2cap_channel_free(channel); 255 } 256 257 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 258 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 259 btstack_run_loop_remove_timer(&channel->rtx); 260 } 261 262 static void l2cap_start_rtx(l2cap_channel_t * channel){ 263 l2cap_stop_rtx(channel); 264 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 265 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 266 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 267 btstack_run_loop_add_timer(&channel->rtx); 268 } 269 270 static void l2cap_start_ertx(l2cap_channel_t * channel){ 271 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 272 l2cap_stop_rtx(channel); 273 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 274 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 275 btstack_run_loop_add_timer(&channel->rtx); 276 } 277 278 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 279 require_security_level2_for_outgoing_sdp = 1; 280 } 281 282 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 283 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 284 } 285 286 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 287 288 if (!hci_can_send_acl_packet_now(handle)){ 289 log_info("l2cap_send_signaling_packet, cannot send"); 290 return BTSTACK_ACL_BUFFERS_FULL; 291 } 292 293 // log_info("l2cap_send_signaling_packet type %u", cmd); 294 hci_reserve_packet_buffer(); 295 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 296 va_list argptr; 297 va_start(argptr, identifier); 298 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 299 va_end(argptr); 300 // log_info("l2cap_send_signaling_packet con %u!", handle); 301 return hci_send_acl_packet_buffer(len); 302 } 303 304 #ifdef ENABLE_BLE 305 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 306 307 if (!hci_can_send_acl_packet_now(handle)){ 308 log_info("l2cap_send_signaling_packet, cannot send"); 309 return BTSTACK_ACL_BUFFERS_FULL; 310 } 311 312 // log_info("l2cap_send_signaling_packet type %u", cmd); 313 hci_reserve_packet_buffer(); 314 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 315 va_list argptr; 316 va_start(argptr, identifier); 317 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 318 va_end(argptr); 319 // log_info("l2cap_send_signaling_packet con %u!", handle); 320 return hci_send_acl_packet_buffer(len); 321 } 322 #endif 323 324 uint8_t *l2cap_get_outgoing_buffer(void){ 325 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 326 } 327 328 int l2cap_reserve_packet_buffer(void){ 329 return hci_reserve_packet_buffer(); 330 } 331 332 void l2cap_release_packet_buffer(void){ 333 hci_release_packet_buffer(); 334 } 335 336 337 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 338 339 if (!hci_is_packet_buffer_reserved()){ 340 log_error("l2cap_send_prepared called without reserving packet first"); 341 return BTSTACK_ACL_BUFFERS_FULL; 342 } 343 344 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 345 if (!channel) { 346 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 347 return -1; // TODO: define error 348 } 349 350 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 351 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 352 return BTSTACK_ACL_BUFFERS_FULL; 353 } 354 355 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 356 357 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 358 359 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 360 361 // 0 - Connection handle : PB=pb : BC=00 362 little_endian_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 363 // 2 - ACL length 364 little_endian_store_16(acl_buffer, 2, len + 4); 365 // 4 - L2CAP packet length 366 little_endian_store_16(acl_buffer, 4, len + 0); 367 // 6 - L2CAP channel DEST 368 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 369 // send 370 int err = hci_send_acl_packet_buffer(len+8); 371 372 return err; 373 } 374 375 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 376 377 if (!hci_is_packet_buffer_reserved()){ 378 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 379 return BTSTACK_ACL_BUFFERS_FULL; 380 } 381 382 if (!hci_can_send_prepared_acl_packet_now(handle)){ 383 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 384 return BTSTACK_ACL_BUFFERS_FULL; 385 } 386 387 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 388 389 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 390 391 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 392 393 // 0 - Connection handle : PB=pb : BC=00 394 little_endian_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 395 // 2 - ACL length 396 little_endian_store_16(acl_buffer, 2, len + 4); 397 // 4 - L2CAP packet length 398 little_endian_store_16(acl_buffer, 4, len + 0); 399 // 6 - L2CAP channel DEST 400 little_endian_store_16(acl_buffer, 6, cid); 401 // send 402 int err = hci_send_acl_packet_buffer(len+8); 403 404 return err; 405 } 406 407 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 408 409 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 410 if (!channel) { 411 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 412 return -1; // TODO: define error 413 } 414 415 if (len > channel->remote_mtu){ 416 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 417 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 418 } 419 420 if (!hci_can_send_acl_packet_now(channel->handle)){ 421 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 422 return BTSTACK_ACL_BUFFERS_FULL; 423 } 424 425 hci_reserve_packet_buffer(); 426 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 427 428 memcpy(&acl_buffer[8], data, len); 429 430 return l2cap_send_prepared(local_cid, len); 431 } 432 433 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 434 435 if (!hci_can_send_acl_packet_now(handle)){ 436 log_info("l2cap_send cid 0x%02x, cannot send", cid); 437 return BTSTACK_ACL_BUFFERS_FULL; 438 } 439 440 hci_reserve_packet_buffer(); 441 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 442 443 memcpy(&acl_buffer[8], data, len); 444 445 return l2cap_send_prepared_connectionless(handle, cid, len); 446 } 447 448 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 449 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 450 } 451 452 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 453 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 454 } 455 456 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 457 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 458 } 459 460 461 462 // MARK: L2CAP_RUN 463 // process outstanding signaling tasks 464 static void l2cap_run(void){ 465 466 // log_info("l2cap_run: entered"); 467 468 // check pending signaling responses 469 while (signaling_responses_pending){ 470 471 hci_con_handle_t handle = signaling_responses[0].handle; 472 473 if (!hci_can_send_acl_packet_now(handle)) break; 474 475 uint8_t sig_id = signaling_responses[0].sig_id; 476 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 477 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 478 uint8_t response_code = signaling_responses[0].code; 479 480 // remove first item before sending (to avoid sending response mutliple times) 481 signaling_responses_pending--; 482 int i; 483 for (i=0; i < signaling_responses_pending; i++){ 484 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 485 } 486 487 switch (response_code){ 488 case CONNECTION_REQUEST: 489 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 490 // also disconnect if result is 0x0003 - security blocked 491 if (result == 0x0003){ 492 hci_disconnect_security_block(handle); 493 } 494 break; 495 case ECHO_REQUEST: 496 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 497 break; 498 case INFORMATION_REQUEST: 499 switch (infoType){ 500 case 1: { // Connectionless MTU 501 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 502 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 503 break; 504 } 505 case 2: { // Extended Features Supported 506 // extended features request supported, features: fixed channels, unicast connectionless data reception 507 uint32_t features = 0x280; 508 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 509 break; 510 } 511 case 3: { // Fixed Channels Supported 512 uint8_t map[8]; 513 memset(map, 0, 8); 514 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 515 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 516 break; 517 } 518 default: 519 // all other types are not supported 520 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 521 break; 522 } 523 break; 524 case COMMAND_REJECT: 525 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 526 #ifdef ENABLE_BLE 527 case COMMAND_REJECT_LE: 528 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 529 break; 530 #endif 531 default: 532 // should not happen 533 break; 534 } 535 } 536 537 uint8_t config_options[4]; 538 btstack_linked_list_iterator_t it; 539 btstack_linked_list_iterator_init(&it, &l2cap_channels); 540 while (btstack_linked_list_iterator_has_next(&it)){ 541 542 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 543 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 544 switch (channel->state){ 545 546 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 547 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 548 if (!hci_can_send_acl_packet_now(channel->handle)) break; 549 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 550 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 551 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 552 } 553 break; 554 555 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 556 if (!hci_can_send_command_packet_now()) break; 557 // send connection request - set state first 558 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 559 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 560 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 561 break; 562 563 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 564 if (!hci_can_send_acl_packet_now(channel->handle)) break; 565 channel->state = L2CAP_STATE_INVALID; 566 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 567 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 568 l2cap_stop_rtx(channel); 569 btstack_linked_list_iterator_remove(&it); 570 btstack_memory_l2cap_channel_free(channel); 571 break; 572 573 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 574 if (!hci_can_send_acl_packet_now(channel->handle)) break; 575 channel->state = L2CAP_STATE_CONFIG; 576 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 577 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 578 break; 579 580 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 581 if (!hci_can_send_acl_packet_now(channel->handle)) break; 582 // success, start l2cap handshake 583 channel->local_sig_id = l2cap_next_sig_id(); 584 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 585 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 586 l2cap_start_rtx(channel); 587 break; 588 589 case L2CAP_STATE_CONFIG: 590 if (!hci_can_send_acl_packet_now(channel->handle)) break; 591 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 592 uint16_t flags = 0; 593 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 594 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 595 flags = 1; 596 } else { 597 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 598 } 599 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 600 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 601 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 602 config_options[0] = 1; // MTU 603 config_options[1] = 2; // len param 604 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 605 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 606 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 607 } else { 608 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 609 } 610 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 611 } 612 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 613 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 614 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 615 channel->local_sig_id = l2cap_next_sig_id(); 616 config_options[0] = 1; // MTU 617 config_options[1] = 2; // len param 618 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 619 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 620 l2cap_start_rtx(channel); 621 } 622 if (l2cap_channel_ready_for_open(channel)){ 623 channel->state = L2CAP_STATE_OPEN; 624 l2cap_emit_channel_opened(channel, 0); // success 625 } 626 break; 627 628 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 629 if (!hci_can_send_acl_packet_now(channel->handle)) break; 630 channel->state = L2CAP_STATE_INVALID; 631 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 632 // 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 :) 633 l2cap_finialize_channel_close(channel); // -- remove from list 634 break; 635 636 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 637 if (!hci_can_send_acl_packet_now(channel->handle)) break; 638 channel->local_sig_id = l2cap_next_sig_id(); 639 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 640 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 641 break; 642 default: 643 break; 644 } 645 } 646 647 #ifdef ENABLE_BLE 648 // send l2cap con paramter update if necessary 649 hci_connections_get_iterator(&it); 650 while(btstack_linked_list_iterator_has_next(&it)){ 651 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 652 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 653 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 654 switch (connection->le_con_parameter_update_state){ 655 case CON_PARAMETER_UPDATE_SEND_REQUEST: 656 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 657 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 658 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 659 break; 660 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 661 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 662 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 663 break; 664 case CON_PARAMETER_UPDATE_DENY: 665 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 666 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 667 break; 668 default: 669 break; 670 } 671 } 672 #endif 673 674 // log_info("l2cap_run: exit"); 675 } 676 677 uint16_t l2cap_max_mtu(void){ 678 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 679 } 680 681 uint16_t l2cap_max_le_mtu(void){ 682 return l2cap_max_mtu(); 683 } 684 685 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 686 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 687 log_info("l2cap_handle_connection_complete expected state"); 688 // success, start l2cap handshake 689 channel->handle = handle; 690 // check remote SSP feature first 691 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 692 } 693 } 694 695 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 696 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 697 698 // we have been waiting for remote supported features, if both support SSP, 699 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)); 700 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 701 // request security level 2 702 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 703 gap_request_security_level(channel->handle, LEVEL_2); 704 return; 705 } 706 // fine, go ahead 707 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 708 } 709 710 /** 711 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 712 * @param packet_handler 713 * @param address 714 * @param psm 715 * @param mtu 716 * @param local_cid 717 */ 718 uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t mtu, uint16_t * out_local_cid){ 719 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 720 721 // alloc structure 722 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 723 if (!chan) { 724 return BTSTACK_MEMORY_ALLOC_FAILED; 725 } 726 727 // Init memory (make valgrind happy) 728 memset(chan, 0, sizeof(l2cap_channel_t)); 729 // limit local mtu to max acl packet length - l2cap header 730 if (mtu > l2cap_max_mtu()) { 731 mtu = l2cap_max_mtu(); 732 } 733 734 // fill in 735 BD_ADDR_COPY(chan->address, address); 736 chan->psm = psm; 737 chan->handle = 0; 738 chan->packet_handler = channel_packet_handler; 739 chan->remote_mtu = L2CAP_MINIMAL_MTU; 740 chan->local_mtu = mtu; 741 chan->local_cid = l2cap_next_local_cid(); 742 743 // set initial state 744 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 745 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 746 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 747 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 748 chan->required_security_level = LEVEL_0; 749 750 // add to connections list 751 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 752 753 // store local_cid 754 if (out_local_cid){ 755 *out_local_cid = chan->local_cid; 756 } 757 758 // check if hci connection is already usable 759 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 760 if (conn){ 761 log_info("l2cap_create_channel, hci connection already exists"); 762 l2cap_handle_connection_complete(conn->con_handle, chan); 763 // check if remote supported fearures are already received 764 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 765 l2cap_handle_remote_supported_features_received(chan); 766 } 767 } 768 769 l2cap_run(); 770 771 return 0; 772 } 773 774 void 775 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 776 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 777 // find channel for local_cid 778 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 779 if (channel) { 780 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 781 } 782 // process 783 l2cap_run(); 784 } 785 786 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 787 btstack_linked_list_iterator_t it; 788 btstack_linked_list_iterator_init(&it, &l2cap_channels); 789 while (btstack_linked_list_iterator_has_next(&it)){ 790 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 791 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 792 // channel for this address found 793 switch (channel->state){ 794 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 795 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 796 // failure, forward error code 797 l2cap_emit_channel_opened(channel, status); 798 // discard channel 799 l2cap_stop_rtx(channel); 800 btstack_linked_list_iterator_remove(&it); 801 btstack_memory_l2cap_channel_free(channel); 802 break; 803 default: 804 break; 805 } 806 } 807 } 808 809 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 810 btstack_linked_list_iterator_t it; 811 btstack_linked_list_iterator_init(&it, &l2cap_channels); 812 while (btstack_linked_list_iterator_has_next(&it)){ 813 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 814 if ( ! BD_ADDR_CMP( channel->address, address) ){ 815 l2cap_handle_connection_complete(handle, channel); 816 } 817 } 818 // process 819 l2cap_run(); 820 } 821 822 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 823 824 bd_addr_t address; 825 hci_con_handle_t handle; 826 btstack_linked_list_iterator_t it; 827 int hci_con_used; 828 829 switch(packet[0]){ 830 831 // handle connection complete events 832 case HCI_EVENT_CONNECTION_COMPLETE: 833 bt_flip_addr(address, &packet[5]); 834 if (packet[2] == 0){ 835 handle = little_endian_read_16(packet, 3); 836 l2cap_handle_connection_success_for_addr(address, handle); 837 } else { 838 l2cap_handle_connection_failed_for_addr(address, packet[2]); 839 } 840 break; 841 842 // handle successful create connection cancel command 843 case HCI_EVENT_COMMAND_COMPLETE: 844 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 845 if (packet[5] == 0){ 846 bt_flip_addr(address, &packet[6]); 847 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 848 l2cap_handle_connection_failed_for_addr(address, 0x16); 849 } 850 } 851 l2cap_run(); // try sending signaling packets first 852 break; 853 854 case HCI_EVENT_COMMAND_STATUS: 855 l2cap_run(); // try sending signaling packets first 856 break; 857 858 // handle disconnection complete events 859 case HCI_EVENT_DISCONNECTION_COMPLETE: 860 // send l2cap disconnect events for all channels on this handle and free them 861 handle = little_endian_read_16(packet, 3); 862 btstack_linked_list_iterator_init(&it, &l2cap_channels); 863 while (btstack_linked_list_iterator_has_next(&it)){ 864 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 865 if (channel->handle != handle) continue; 866 l2cap_emit_channel_closed(channel); 867 l2cap_stop_rtx(channel); 868 btstack_linked_list_iterator_remove(&it); 869 btstack_memory_l2cap_channel_free(channel); 870 } 871 break; 872 873 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 874 l2cap_run(); // try sending signaling packets first 875 break; 876 877 // HCI Connection Timeouts 878 case L2CAP_EVENT_TIMEOUT_CHECK: 879 handle = little_endian_read_16(packet, 2); 880 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 881 if (hci_authentication_active_for_handle(handle)) break; 882 hci_con_used = 0; 883 btstack_linked_list_iterator_init(&it, &l2cap_channels); 884 while (btstack_linked_list_iterator_has_next(&it)){ 885 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 886 if (channel->handle != handle) continue; 887 hci_con_used = 1; 888 break; 889 } 890 if (hci_con_used) break; 891 if (!hci_can_send_command_packet_now()) break; 892 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 893 break; 894 895 case DAEMON_EVENT_HCI_PACKET_SENT: 896 l2cap_run(); // try sending signaling packets first 897 898 btstack_linked_list_iterator_init(&it, &l2cap_channels); 899 while (btstack_linked_list_iterator_has_next(&it)){ 900 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 901 if (!channel->packet_handler) continue; 902 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 903 } 904 break; 905 906 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 907 handle = little_endian_read_16(packet, 3); 908 btstack_linked_list_iterator_init(&it, &l2cap_channels); 909 while (btstack_linked_list_iterator_has_next(&it)){ 910 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 911 if (channel->handle != handle) continue; 912 l2cap_handle_remote_supported_features_received(channel); 913 break; 914 } 915 break; 916 917 case GAP_EVENT_SECURITY_LEVEL: 918 handle = little_endian_read_16(packet, 2); 919 log_info("l2cap - security level update"); 920 btstack_linked_list_iterator_init(&it, &l2cap_channels); 921 while (btstack_linked_list_iterator_has_next(&it)){ 922 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 923 if (channel->handle != handle) continue; 924 925 log_info("l2cap - state %u", channel->state); 926 927 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 928 gap_security_level_t required_level = channel->required_security_level; 929 930 switch (channel->state){ 931 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 932 if (actual_level >= required_level){ 933 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 934 l2cap_emit_connection_request(channel); 935 } else { 936 channel->reason = 0x0003; // security block 937 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 938 } 939 break; 940 941 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 942 if (actual_level >= required_level){ 943 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 944 } else { 945 // disconnnect, authentication not good enough 946 hci_disconnect_security_block(handle); 947 } 948 break; 949 950 default: 951 break; 952 } 953 } 954 break; 955 956 default: 957 break; 958 } 959 960 l2cap_run(); 961 } 962 963 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 964 channel->remote_sig_id = identifier; 965 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 966 l2cap_run(); 967 } 968 969 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 970 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 971 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 972 signaling_responses[signaling_responses_pending].handle = handle; 973 signaling_responses[signaling_responses_pending].code = code; 974 signaling_responses[signaling_responses_pending].sig_id = sig_id; 975 signaling_responses[signaling_responses_pending].data = data; 976 signaling_responses_pending++; 977 l2cap_run(); 978 } 979 } 980 981 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 982 983 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 984 l2cap_service_t *service = l2cap_get_service(psm); 985 if (!service) { 986 // 0x0002 PSM not supported 987 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 988 return; 989 } 990 991 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 992 if (!hci_connection) { 993 // 994 log_error("no hci_connection for handle %u", handle); 995 return; 996 } 997 998 // alloc structure 999 // log_info("l2cap_handle_connection_request register channel"); 1000 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1001 if (!channel){ 1002 // 0x0004 No resources available 1003 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1004 return; 1005 } 1006 // Init memory (make valgrind happy) 1007 memset(channel, 0, sizeof(l2cap_channel_t)); 1008 // fill in 1009 BD_ADDR_COPY(channel->address, hci_connection->address); 1010 channel->psm = psm; 1011 channel->handle = handle; 1012 channel->packet_handler = service->packet_handler; 1013 channel->local_cid = l2cap_next_local_cid(); 1014 channel->remote_cid = source_cid; 1015 channel->local_mtu = service->mtu; 1016 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1017 channel->remote_sig_id = sig_id; 1018 channel->required_security_level = service->required_security_level; 1019 1020 // limit local mtu to max acl packet length - l2cap header 1021 if (channel->local_mtu > l2cap_max_mtu()) { 1022 channel->local_mtu = l2cap_max_mtu(); 1023 } 1024 1025 // set initial state 1026 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1027 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1028 1029 // add to connections list 1030 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1031 1032 // assert security requirements 1033 gap_request_security_level(handle, channel->required_security_level); 1034 } 1035 1036 void l2cap_accept_connection(uint16_t local_cid){ 1037 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1038 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1039 if (!channel) { 1040 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1041 return; 1042 } 1043 1044 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1045 1046 // process 1047 l2cap_run(); 1048 } 1049 1050 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1051 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1052 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1053 if (!channel) { 1054 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1055 return; 1056 } 1057 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1058 channel->reason = reason; 1059 l2cap_run(); 1060 } 1061 1062 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1063 1064 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1065 1066 uint16_t flags = little_endian_read_16(command, 6); 1067 if (flags & 1) { 1068 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1069 } 1070 1071 // accept the other's configuration options 1072 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1073 uint16_t pos = 8; 1074 while (pos < end_pos){ 1075 uint8_t option_hint = command[pos] >> 7; 1076 uint8_t option_type = command[pos] & 0x7f; 1077 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1078 pos++; 1079 uint8_t length = command[pos++]; 1080 // MTU { type(8): 1, len(8):2, MTU(16) } 1081 if (option_type == 1 && length == 2){ 1082 channel->remote_mtu = little_endian_read_16(command, pos); 1083 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1084 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1085 } 1086 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1087 if (option_type == 2 && length == 2){ 1088 channel->flush_timeout = little_endian_read_16(command, pos); 1089 } 1090 // check for unknown options 1091 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1092 log_info("l2cap cid %u, unknown options", channel->local_cid); 1093 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1094 } 1095 pos += length; 1096 } 1097 } 1098 1099 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1100 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1101 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1102 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1103 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1104 if (channel->state == L2CAP_STATE_OPEN) return 0; 1105 return 1; 1106 } 1107 1108 1109 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1110 1111 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1112 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1113 uint16_t result = 0; 1114 1115 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1116 1117 // handle DISCONNECT REQUESTS seperately 1118 if (code == DISCONNECTION_REQUEST){ 1119 switch (channel->state){ 1120 case L2CAP_STATE_CONFIG: 1121 case L2CAP_STATE_OPEN: 1122 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1123 case L2CAP_STATE_WAIT_DISCONNECT: 1124 l2cap_handle_disconnect_request(channel, identifier); 1125 break; 1126 1127 default: 1128 // ignore in other states 1129 break; 1130 } 1131 return; 1132 } 1133 1134 // @STATEMACHINE(l2cap) 1135 switch (channel->state) { 1136 1137 case L2CAP_STATE_WAIT_CONNECT_RSP: 1138 switch (code){ 1139 case CONNECTION_RESPONSE: 1140 l2cap_stop_rtx(channel); 1141 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1142 switch (result) { 1143 case 0: 1144 // successful connection 1145 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1146 channel->state = L2CAP_STATE_CONFIG; 1147 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1148 break; 1149 case 1: 1150 // connection pending. get some coffee, but start the ERTX 1151 l2cap_start_ertx(channel); 1152 break; 1153 default: 1154 // channel closed 1155 channel->state = L2CAP_STATE_CLOSED; 1156 // map l2cap connection response result to BTstack status enumeration 1157 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1158 1159 // drop link key if security block 1160 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1161 hci_drop_link_key_for_bd_addr(channel->address); 1162 } 1163 1164 // discard channel 1165 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1166 btstack_memory_l2cap_channel_free(channel); 1167 break; 1168 } 1169 break; 1170 1171 default: 1172 //@TODO: implement other signaling packets 1173 break; 1174 } 1175 break; 1176 1177 case L2CAP_STATE_CONFIG: 1178 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1179 switch (code) { 1180 case CONFIGURE_REQUEST: 1181 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1182 l2cap_signaling_handle_configure_request(channel, command); 1183 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1184 // only done if continuation not set 1185 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1186 } 1187 break; 1188 case CONFIGURE_RESPONSE: 1189 l2cap_stop_rtx(channel); 1190 switch (result){ 1191 case 0: // success 1192 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1193 break; 1194 case 4: // pending 1195 l2cap_start_ertx(channel); 1196 break; 1197 default: 1198 // retry on negative result 1199 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1200 break; 1201 } 1202 break; 1203 default: 1204 break; 1205 } 1206 if (l2cap_channel_ready_for_open(channel)){ 1207 // for open: 1208 channel->state = L2CAP_STATE_OPEN; 1209 l2cap_emit_channel_opened(channel, 0); 1210 } 1211 break; 1212 1213 case L2CAP_STATE_WAIT_DISCONNECT: 1214 switch (code) { 1215 case DISCONNECTION_RESPONSE: 1216 l2cap_finialize_channel_close(channel); 1217 break; 1218 default: 1219 //@TODO: implement other signaling packets 1220 break; 1221 } 1222 break; 1223 1224 case L2CAP_STATE_CLOSED: 1225 // @TODO handle incoming requests 1226 break; 1227 1228 case L2CAP_STATE_OPEN: 1229 //@TODO: implement other signaling packets, e.g. re-configure 1230 break; 1231 default: 1232 break; 1233 } 1234 // log_info("new state %u", channel->state); 1235 } 1236 1237 1238 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1239 1240 // get code, signalind identifier and command len 1241 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1242 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1243 1244 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1245 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1246 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1247 return; 1248 } 1249 1250 // general commands without an assigned channel 1251 switch(code) { 1252 1253 case CONNECTION_REQUEST: { 1254 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1255 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1256 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1257 return; 1258 } 1259 1260 case ECHO_REQUEST: 1261 l2cap_register_signaling_response(handle, code, sig_id, 0); 1262 return; 1263 1264 case INFORMATION_REQUEST: { 1265 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1266 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1267 return; 1268 } 1269 1270 default: 1271 break; 1272 } 1273 1274 1275 // Get potential destination CID 1276 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1277 1278 // Find channel for this sig_id and connection handle 1279 btstack_linked_list_iterator_t it; 1280 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1281 while (btstack_linked_list_iterator_has_next(&it)){ 1282 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1283 if (channel->handle != handle) continue; 1284 if (code & 1) { 1285 // match odd commands (responses) by previous signaling identifier 1286 if (channel->local_sig_id == sig_id) { 1287 l2cap_signaling_handler_channel(channel, command); 1288 break; 1289 } 1290 } else { 1291 // match even commands (requests) by local channel id 1292 if (channel->local_cid == dest_cid) { 1293 l2cap_signaling_handler_channel(channel, command); 1294 break; 1295 } 1296 } 1297 } 1298 } 1299 1300 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ){ 1301 1302 // Get Channel ID 1303 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1304 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1305 1306 switch (channel_id) { 1307 1308 case L2CAP_CID_SIGNALING: { 1309 1310 uint16_t command_offset = 8; 1311 while (command_offset < size) { 1312 1313 // handle signaling commands 1314 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1315 1316 // increment command_offset 1317 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1318 } 1319 break; 1320 } 1321 1322 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1323 if (attribute_protocol_packet_handler) { 1324 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1325 } 1326 break; 1327 1328 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1329 if (security_protocol_packet_handler) { 1330 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1331 } 1332 break; 1333 1334 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1335 if (connectionless_channel_packet_handler) { 1336 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1337 } 1338 break; 1339 1340 case L2CAP_CID_SIGNALING_LE: { 1341 switch (packet[8]){ 1342 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1343 uint16_t result = little_endian_read_16(packet, 12); 1344 l2cap_emit_connection_parameter_update_response(handle, result); 1345 break; 1346 } 1347 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1348 uint8_t event[10]; 1349 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1350 event[1] = 8; 1351 memcpy(&event[2], &packet[12], 8); 1352 1353 hci_connection_t * connection = hci_connection_for_handle(handle); 1354 if (connection){ 1355 if (connection->role != HCI_ROLE_MASTER){ 1356 // reject command without notifying upper layer when not in master role 1357 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1358 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1359 break; 1360 } 1361 int update_parameter = 1; 1362 le_connection_parameter_range_t existing_range; 1363 gap_le_get_connection_parameter_range(existing_range); 1364 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1365 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1366 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1367 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1368 1369 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1370 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1371 1372 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1373 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1374 1375 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1376 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1377 1378 if (update_parameter){ 1379 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1380 connection->le_conn_interval_min = le_conn_interval_min; 1381 connection->le_conn_interval_max = le_conn_interval_max; 1382 connection->le_conn_latency = le_conn_latency; 1383 connection->le_supervision_timeout = le_supervision_timeout; 1384 } else { 1385 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1386 } 1387 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1388 } 1389 1390 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1391 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1392 1393 break; 1394 } 1395 default: { 1396 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1397 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1398 break; 1399 } 1400 } 1401 break; 1402 } 1403 1404 default: { 1405 // Find channel for this channel_id and connection handle 1406 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1407 if (channel) { 1408 l2cap_dispatch_to_channel(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1409 } 1410 break; 1411 } 1412 } 1413 1414 l2cap_run(); 1415 } 1416 1417 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1418 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1419 channel->state = L2CAP_STATE_CLOSED; 1420 l2cap_emit_channel_closed(channel); 1421 // discard channel 1422 l2cap_stop_rtx(channel); 1423 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1424 btstack_memory_l2cap_channel_free(channel); 1425 } 1426 1427 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1428 btstack_linked_list_iterator_t it; 1429 btstack_linked_list_iterator_init(&it, services); 1430 while (btstack_linked_list_iterator_has_next(&it)){ 1431 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1432 if ( service->psm == psm){ 1433 return service; 1434 }; 1435 } 1436 return NULL; 1437 } 1438 1439 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1440 return l2cap_get_service_internal(&l2cap_services, psm); 1441 } 1442 1443 1444 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1445 1446 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1447 1448 // check for alread registered psm 1449 // TODO: emit error event 1450 l2cap_service_t *service = l2cap_get_service(psm); 1451 if (service) { 1452 log_error("l2cap_register_service: PSM %u already registered", psm); 1453 return L2CAP_SERVICE_ALREADY_REGISTERED; 1454 } 1455 1456 // alloc structure 1457 // TODO: emit error event 1458 service = btstack_memory_l2cap_service_get(); 1459 if (!service) { 1460 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1461 return BTSTACK_MEMORY_ALLOC_FAILED; 1462 } 1463 1464 // fill in 1465 service->psm = psm; 1466 service->mtu = mtu; 1467 service->packet_handler = service_packet_handler; 1468 service->required_security_level = security_level; 1469 1470 // add to services list 1471 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1472 1473 // enable page scan 1474 hci_connectable_control(1); 1475 1476 return 0; 1477 } 1478 1479 void l2cap_unregister_service(uint16_t psm){ 1480 1481 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1482 1483 l2cap_service_t *service = l2cap_get_service(psm); 1484 if (!service) return; 1485 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1486 btstack_memory_l2cap_service_free(service); 1487 1488 // disable page scan when no services registered 1489 if (!btstack_linked_list_empty(&l2cap_services)) return; 1490 hci_connectable_control(0); 1491 } 1492 1493 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1494 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1495 switch(channel_id){ 1496 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1497 attribute_protocol_packet_handler = the_packet_handler; 1498 break; 1499 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1500 security_protocol_packet_handler = the_packet_handler; 1501 break; 1502 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1503 connectionless_channel_packet_handler = the_packet_handler; 1504 break; 1505 } 1506 } 1507 1508 #ifdef ENABLE_BLE 1509 1510 1511 #if 0 1512 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1513 return l2cap_get_service_internal(&l2cap_le_services, psm); 1514 } 1515 /** 1516 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1517 * @param 1518 */ 1519 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1520 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1521 1522 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1523 1524 // check for alread registered psm 1525 // TODO: emit error event 1526 l2cap_service_t *service = l2cap_le_get_service(psm); 1527 if (service) { 1528 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1529 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1530 return; 1531 } 1532 1533 // alloc structure 1534 // TODO: emit error event 1535 service = btstack_memory_l2cap_service_get(); 1536 if (!service) { 1537 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1538 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1539 return; 1540 } 1541 1542 // fill in 1543 service->psm = psm; 1544 service->mtu = mtu; 1545 service->mps = mps; 1546 service->packet_handler = packet_handler; 1547 service->required_security_level = security_level; 1548 1549 // add to services list 1550 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1551 1552 // done 1553 l2cap_emit_service_registered(connection, 0, psm); 1554 } 1555 1556 void l2cap_le_unregister_service(uint16_t psm) { 1557 1558 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1559 1560 l2cap_service_t *service = l2cap_le_get_service(psm); 1561 if (!service) return; 1562 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1563 btstack_memory_l2cap_service_free(service); 1564 } 1565 #endif 1566 #endif 1567