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 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 btstack_packet_callback_registration_t hci_event_callback_registration; 77 78 static btstack_linked_list_t l2cap_channels; 79 static btstack_linked_list_t l2cap_services; 80 static btstack_linked_list_t l2cap_le_channels; 81 static btstack_linked_list_t l2cap_le_services; 82 static void (*packet_handler) (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 83 84 static btstack_packet_handler_t attribute_protocol_packet_handler; 85 static btstack_packet_handler_t security_protocol_packet_handler; 86 static btstack_packet_handler_t connectionless_channel_packet_handler; 87 static uint8_t require_security_level2_for_outgoing_sdp; 88 89 // prototypes 90 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 91 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 92 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 93 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 94 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 95 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 96 97 98 void l2cap_init(void){ 99 signaling_responses_pending = 0; 100 101 l2cap_channels = NULL; 102 l2cap_services = NULL; 103 l2cap_le_services = NULL; 104 l2cap_le_channels = NULL; 105 106 packet_handler = null_packet_handler; 107 attribute_protocol_packet_handler = NULL; 108 security_protocol_packet_handler = NULL; 109 connectionless_channel_packet_handler = NULL; 110 111 require_security_level2_for_outgoing_sdp = 0; 112 113 // 114 // register callback with HCI 115 // 116 hci_event_callback_registration.callback = &l2cap_packet_handler; 117 hci_add_event_handler(&hci_event_callback_registration); 118 119 hci_register_acl_packet_handler(&l2cap_packet_handler); 120 121 hci_connectable_control(0); // no services yet 122 } 123 124 125 /** Register L2CAP packet handlers */ 126 static void null_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 127 } 128 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 129 packet_handler = handler; 130 } 131 132 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 133 (* (channel->packet_handler))(type, channel->local_cid, data, size); 134 } 135 136 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 137 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", 138 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 139 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 140 uint8_t event[23]; 141 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 142 event[1] = sizeof(event) - 2; 143 event[2] = status; 144 bt_flip_addr(&event[3], channel->address); 145 little_endian_store_16(event, 9, channel->handle); 146 little_endian_store_16(event, 11, channel->psm); 147 little_endian_store_16(event, 13, channel->local_cid); 148 little_endian_store_16(event, 15, channel->remote_cid); 149 little_endian_store_16(event, 17, channel->local_mtu); 150 little_endian_store_16(event, 19, channel->remote_mtu); 151 little_endian_store_16(event, 21, channel->flush_timeout); 152 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 153 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 154 } 155 156 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 157 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 158 uint8_t event[4]; 159 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 160 event[1] = sizeof(event) - 2; 161 little_endian_store_16(event, 2, channel->local_cid); 162 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 163 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 164 } 165 166 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 167 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 168 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 169 uint8_t event[16]; 170 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 171 event[1] = sizeof(event) - 2; 172 bt_flip_addr(&event[2], channel->address); 173 little_endian_store_16(event, 8, channel->handle); 174 little_endian_store_16(event, 10, channel->psm); 175 little_endian_store_16(event, 12, channel->local_cid); 176 little_endian_store_16(event, 14, channel->remote_cid); 177 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 178 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 179 } 180 181 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 182 uint8_t event[6]; 183 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 184 event[1] = 4; 185 little_endian_store_16(event, 2, handle); 186 little_endian_store_16(event, 4, result); 187 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 (*packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 189 } 190 191 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 192 btstack_linked_list_iterator_t it; 193 btstack_linked_list_iterator_init(&it, &l2cap_channels); 194 while (btstack_linked_list_iterator_has_next(&it)){ 195 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 196 if ( channel->local_cid == local_cid) { 197 return channel; 198 } 199 } 200 return NULL; 201 } 202 203 int l2cap_can_send_packet_now(uint16_t local_cid){ 204 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 205 if (!channel) return 0; 206 return hci_can_send_acl_packet_now(channel->handle); 207 } 208 209 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 210 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 211 if (!channel) return 0; 212 return hci_can_send_prepared_acl_packet_now(channel->handle); 213 } 214 215 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 216 return hci_can_send_acl_packet_now(handle); 217 } 218 219 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 220 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 221 if (channel) { 222 return channel->remote_mtu; 223 } 224 return 0; 225 } 226 227 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 228 btstack_linked_list_iterator_t it; 229 btstack_linked_list_iterator_init(&it, &l2cap_channels); 230 while (btstack_linked_list_iterator_has_next(&it)){ 231 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 232 if ( &channel->rtx == ts) { 233 return channel; 234 } 235 } 236 return NULL; 237 } 238 239 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 240 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 241 if (!ts) return; 242 243 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 244 245 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 246 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 247 // notify client 248 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 249 250 // discard channel 251 // no need to stop timer here, it is removed from list during timer callback 252 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 253 btstack_memory_l2cap_channel_free(channel); 254 } 255 256 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 257 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 258 btstack_run_loop_remove_timer(&channel->rtx); 259 } 260 261 static void l2cap_start_rtx(l2cap_channel_t * channel){ 262 l2cap_stop_rtx(channel); 263 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 264 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 265 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 266 btstack_run_loop_add_timer(&channel->rtx); 267 } 268 269 static void l2cap_start_ertx(l2cap_channel_t * channel){ 270 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 271 l2cap_stop_rtx(channel); 272 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 273 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 274 btstack_run_loop_add_timer(&channel->rtx); 275 } 276 277 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 278 require_security_level2_for_outgoing_sdp = 1; 279 } 280 281 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 282 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 283 } 284 285 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 286 287 if (!hci_can_send_acl_packet_now(handle)){ 288 log_info("l2cap_send_signaling_packet, cannot send"); 289 return BTSTACK_ACL_BUFFERS_FULL; 290 } 291 292 // log_info("l2cap_send_signaling_packet type %u", cmd); 293 hci_reserve_packet_buffer(); 294 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 295 va_list argptr; 296 va_start(argptr, identifier); 297 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 298 va_end(argptr); 299 // log_info("l2cap_send_signaling_packet con %u!", handle); 300 return hci_send_acl_packet_buffer(len); 301 } 302 303 #ifdef ENABLE_BLE 304 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 305 306 if (!hci_can_send_acl_packet_now(handle)){ 307 log_info("l2cap_send_signaling_packet, cannot send"); 308 return BTSTACK_ACL_BUFFERS_FULL; 309 } 310 311 // log_info("l2cap_send_signaling_packet type %u", cmd); 312 hci_reserve_packet_buffer(); 313 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 314 va_list argptr; 315 va_start(argptr, identifier); 316 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 317 va_end(argptr); 318 // log_info("l2cap_send_signaling_packet con %u!", handle); 319 return hci_send_acl_packet_buffer(len); 320 } 321 #endif 322 323 uint8_t *l2cap_get_outgoing_buffer(void){ 324 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 325 } 326 327 int l2cap_reserve_packet_buffer(void){ 328 return hci_reserve_packet_buffer(); 329 } 330 331 void l2cap_release_packet_buffer(void){ 332 hci_release_packet_buffer(); 333 } 334 335 336 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 337 338 if (!hci_is_packet_buffer_reserved()){ 339 log_error("l2cap_send_prepared called without reserving packet first"); 340 return BTSTACK_ACL_BUFFERS_FULL; 341 } 342 343 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 344 if (!channel) { 345 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 346 return -1; // TODO: define error 347 } 348 349 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 350 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 351 return BTSTACK_ACL_BUFFERS_FULL; 352 } 353 354 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 355 356 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 357 358 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 359 360 // 0 - Connection handle : PB=pb : BC=00 361 little_endian_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 362 // 2 - ACL length 363 little_endian_store_16(acl_buffer, 2, len + 4); 364 // 4 - L2CAP packet length 365 little_endian_store_16(acl_buffer, 4, len + 0); 366 // 6 - L2CAP channel DEST 367 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 368 // send 369 int err = hci_send_acl_packet_buffer(len+8); 370 371 return err; 372 } 373 374 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 375 376 if (!hci_is_packet_buffer_reserved()){ 377 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 378 return BTSTACK_ACL_BUFFERS_FULL; 379 } 380 381 if (!hci_can_send_prepared_acl_packet_now(handle)){ 382 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 383 return BTSTACK_ACL_BUFFERS_FULL; 384 } 385 386 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 387 388 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 389 390 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 391 392 // 0 - Connection handle : PB=pb : BC=00 393 little_endian_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 394 // 2 - ACL length 395 little_endian_store_16(acl_buffer, 2, len + 4); 396 // 4 - L2CAP packet length 397 little_endian_store_16(acl_buffer, 4, len + 0); 398 // 6 - L2CAP channel DEST 399 little_endian_store_16(acl_buffer, 6, cid); 400 // send 401 int err = hci_send_acl_packet_buffer(len+8); 402 403 return err; 404 } 405 406 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 407 408 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 409 if (!channel) { 410 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 411 return -1; // TODO: define error 412 } 413 414 if (len > channel->remote_mtu){ 415 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 416 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 417 } 418 419 if (!hci_can_send_acl_packet_now(channel->handle)){ 420 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 421 return BTSTACK_ACL_BUFFERS_FULL; 422 } 423 424 hci_reserve_packet_buffer(); 425 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 426 427 memcpy(&acl_buffer[8], data, len); 428 429 return l2cap_send_prepared(local_cid, len); 430 } 431 432 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 433 434 if (!hci_can_send_acl_packet_now(handle)){ 435 log_info("l2cap_send cid 0x%02x, cannot send", cid); 436 return BTSTACK_ACL_BUFFERS_FULL; 437 } 438 439 hci_reserve_packet_buffer(); 440 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 441 442 memcpy(&acl_buffer[8], data, len); 443 444 return l2cap_send_prepared_connectionless(handle, cid, len); 445 } 446 447 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 448 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 449 } 450 451 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 452 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 453 } 454 455 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 456 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 457 } 458 459 460 461 // MARK: L2CAP_RUN 462 // process outstanding signaling tasks 463 static void l2cap_run(void){ 464 465 // log_info("l2cap_run: entered"); 466 467 // check pending signaling responses 468 while (signaling_responses_pending){ 469 470 hci_con_handle_t handle = signaling_responses[0].handle; 471 472 if (!hci_can_send_acl_packet_now(handle)) break; 473 474 uint8_t sig_id = signaling_responses[0].sig_id; 475 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 476 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 477 uint8_t response_code = signaling_responses[0].code; 478 479 // remove first item before sending (to avoid sending response mutliple times) 480 signaling_responses_pending--; 481 int i; 482 for (i=0; i < signaling_responses_pending; i++){ 483 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 484 } 485 486 switch (response_code){ 487 case CONNECTION_REQUEST: 488 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 489 // also disconnect if result is 0x0003 - security blocked 490 if (result == 0x0003){ 491 hci_disconnect_security_block(handle); 492 } 493 break; 494 case ECHO_REQUEST: 495 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 496 break; 497 case INFORMATION_REQUEST: 498 switch (infoType){ 499 case 1: { // Connectionless MTU 500 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 501 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 502 break; 503 } 504 case 2: { // Extended Features Supported 505 // extended features request supported, features: fixed channels, unicast connectionless data reception 506 uint32_t features = 0x280; 507 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 508 break; 509 } 510 case 3: { // Fixed Channels Supported 511 uint8_t map[8]; 512 memset(map, 0, 8); 513 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 514 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 515 break; 516 } 517 default: 518 // all other types are not supported 519 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 520 break; 521 } 522 break; 523 case COMMAND_REJECT: 524 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 525 #ifdef ENABLE_BLE 526 case COMMAND_REJECT_LE: 527 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 528 break; 529 #endif 530 default: 531 // should not happen 532 break; 533 } 534 } 535 536 uint8_t config_options[4]; 537 btstack_linked_list_iterator_t it; 538 btstack_linked_list_iterator_init(&it, &l2cap_channels); 539 while (btstack_linked_list_iterator_has_next(&it)){ 540 541 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 542 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 543 switch (channel->state){ 544 545 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 546 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 547 if (!hci_can_send_acl_packet_now(channel->handle)) break; 548 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 549 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 550 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 551 } 552 break; 553 554 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 555 if (!hci_can_send_command_packet_now()) break; 556 // send connection request - set state first 557 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 558 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 559 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 560 break; 561 562 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 563 if (!hci_can_send_acl_packet_now(channel->handle)) break; 564 channel->state = L2CAP_STATE_INVALID; 565 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 566 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 567 l2cap_stop_rtx(channel); 568 btstack_linked_list_iterator_remove(&it); 569 btstack_memory_l2cap_channel_free(channel); 570 break; 571 572 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 573 if (!hci_can_send_acl_packet_now(channel->handle)) break; 574 channel->state = L2CAP_STATE_CONFIG; 575 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 576 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 577 break; 578 579 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 580 if (!hci_can_send_acl_packet_now(channel->handle)) break; 581 // success, start l2cap handshake 582 channel->local_sig_id = l2cap_next_sig_id(); 583 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 584 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 585 l2cap_start_rtx(channel); 586 break; 587 588 case L2CAP_STATE_CONFIG: 589 if (!hci_can_send_acl_packet_now(channel->handle)) break; 590 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 591 uint16_t flags = 0; 592 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 593 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 594 flags = 1; 595 } else { 596 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 597 } 598 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 599 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 600 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 601 config_options[0] = 1; // MTU 602 config_options[1] = 2; // len param 603 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 604 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 605 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 606 } else { 607 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 608 } 609 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 610 } 611 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 612 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 613 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 614 channel->local_sig_id = l2cap_next_sig_id(); 615 config_options[0] = 1; // MTU 616 config_options[1] = 2; // len param 617 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 618 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 619 l2cap_start_rtx(channel); 620 } 621 if (l2cap_channel_ready_for_open(channel)){ 622 channel->state = L2CAP_STATE_OPEN; 623 l2cap_emit_channel_opened(channel, 0); // success 624 } 625 break; 626 627 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 628 if (!hci_can_send_acl_packet_now(channel->handle)) break; 629 channel->state = L2CAP_STATE_INVALID; 630 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 631 // 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 :) 632 l2cap_finialize_channel_close(channel); // -- remove from list 633 break; 634 635 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 636 if (!hci_can_send_acl_packet_now(channel->handle)) break; 637 channel->local_sig_id = l2cap_next_sig_id(); 638 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 639 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 640 break; 641 default: 642 break; 643 } 644 } 645 646 #ifdef ENABLE_BLE 647 // send l2cap con paramter update if necessary 648 hci_connections_get_iterator(&it); 649 while(btstack_linked_list_iterator_has_next(&it)){ 650 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 651 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 652 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 653 switch (connection->le_con_parameter_update_state){ 654 case CON_PARAMETER_UPDATE_SEND_REQUEST: 655 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 656 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 657 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 658 break; 659 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 660 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 661 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 662 break; 663 case CON_PARAMETER_UPDATE_DENY: 664 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 665 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 666 break; 667 default: 668 break; 669 } 670 } 671 #endif 672 673 // log_info("l2cap_run: exit"); 674 } 675 676 uint16_t l2cap_max_mtu(void){ 677 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 678 } 679 680 uint16_t l2cap_max_le_mtu(void){ 681 return l2cap_max_mtu(); 682 } 683 684 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 685 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 686 log_info("l2cap_handle_connection_complete expected state"); 687 // success, start l2cap handshake 688 channel->handle = handle; 689 // check remote SSP feature first 690 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 691 } 692 } 693 694 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 695 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 696 697 // we have been waiting for remote supported features, if both support SSP, 698 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)); 699 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 700 // request security level 2 701 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 702 gap_request_security_level(channel->handle, LEVEL_2); 703 return; 704 } 705 // fine, go ahead 706 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 707 } 708 709 /** 710 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 711 * @param packet_handler 712 * @param address 713 * @param psm 714 * @param mtu 715 * @param local_cid 716 */ 717 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){ 718 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 719 720 // alloc structure 721 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 722 if (!chan) { 723 return BTSTACK_MEMORY_ALLOC_FAILED; 724 } 725 726 // Init memory (make valgrind happy) 727 memset(chan, 0, sizeof(l2cap_channel_t)); 728 // limit local mtu to max acl packet length - l2cap header 729 if (mtu > l2cap_max_mtu()) { 730 mtu = l2cap_max_mtu(); 731 } 732 733 // fill in 734 BD_ADDR_COPY(chan->address, address); 735 chan->psm = psm; 736 chan->handle = 0; 737 chan->packet_handler = channel_packet_handler; 738 chan->remote_mtu = L2CAP_MINIMAL_MTU; 739 chan->local_mtu = mtu; 740 chan->local_cid = l2cap_next_local_cid(); 741 742 // set initial state 743 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 744 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 745 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 746 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 747 chan->required_security_level = LEVEL_0; 748 749 // add to connections list 750 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 751 752 // store local_cid 753 if (out_local_cid){ 754 *out_local_cid = chan->local_cid; 755 } 756 757 // check if hci connection is already usable 758 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 759 if (conn){ 760 log_info("l2cap_create_channel, hci connection already exists"); 761 l2cap_handle_connection_complete(conn->con_handle, chan); 762 // check if remote supported fearures are already received 763 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 764 l2cap_handle_remote_supported_features_received(chan); 765 } 766 } 767 768 l2cap_run(); 769 770 return 0; 771 } 772 773 void 774 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 775 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 776 // find channel for local_cid 777 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 778 if (channel) { 779 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 780 } 781 // process 782 l2cap_run(); 783 } 784 785 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 786 btstack_linked_list_iterator_t it; 787 btstack_linked_list_iterator_init(&it, &l2cap_channels); 788 while (btstack_linked_list_iterator_has_next(&it)){ 789 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 790 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 791 // channel for this address found 792 switch (channel->state){ 793 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 794 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 795 // failure, forward error code 796 l2cap_emit_channel_opened(channel, status); 797 // discard channel 798 l2cap_stop_rtx(channel); 799 btstack_linked_list_iterator_remove(&it); 800 btstack_memory_l2cap_channel_free(channel); 801 break; 802 default: 803 break; 804 } 805 } 806 } 807 808 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 809 btstack_linked_list_iterator_t it; 810 btstack_linked_list_iterator_init(&it, &l2cap_channels); 811 while (btstack_linked_list_iterator_has_next(&it)){ 812 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 813 if ( ! BD_ADDR_CMP( channel->address, address) ){ 814 l2cap_handle_connection_complete(handle, channel); 815 } 816 } 817 // process 818 l2cap_run(); 819 } 820 821 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 822 823 bd_addr_t address; 824 hci_con_handle_t handle; 825 btstack_linked_list_iterator_t it; 826 int hci_con_used; 827 828 switch(packet[0]){ 829 830 // handle connection complete events 831 case HCI_EVENT_CONNECTION_COMPLETE: 832 bt_flip_addr(address, &packet[5]); 833 if (packet[2] == 0){ 834 handle = little_endian_read_16(packet, 3); 835 l2cap_handle_connection_success_for_addr(address, handle); 836 } else { 837 l2cap_handle_connection_failed_for_addr(address, packet[2]); 838 } 839 break; 840 841 // handle successful create connection cancel command 842 case HCI_EVENT_COMMAND_COMPLETE: 843 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 844 if (packet[5] == 0){ 845 bt_flip_addr(address, &packet[6]); 846 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 847 l2cap_handle_connection_failed_for_addr(address, 0x16); 848 } 849 } 850 l2cap_run(); // try sending signaling packets first 851 break; 852 853 case HCI_EVENT_COMMAND_STATUS: 854 l2cap_run(); // try sending signaling packets first 855 break; 856 857 // handle disconnection complete events 858 case HCI_EVENT_DISCONNECTION_COMPLETE: 859 // send l2cap disconnect events for all channels on this handle and free them 860 handle = little_endian_read_16(packet, 3); 861 btstack_linked_list_iterator_init(&it, &l2cap_channels); 862 while (btstack_linked_list_iterator_has_next(&it)){ 863 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 864 if (channel->handle != handle) continue; 865 l2cap_emit_channel_closed(channel); 866 l2cap_stop_rtx(channel); 867 btstack_linked_list_iterator_remove(&it); 868 btstack_memory_l2cap_channel_free(channel); 869 } 870 break; 871 872 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 873 l2cap_run(); // try sending signaling packets first 874 break; 875 876 // HCI Connection Timeouts 877 case L2CAP_EVENT_TIMEOUT_CHECK: 878 handle = little_endian_read_16(packet, 2); 879 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 880 if (hci_authentication_active_for_handle(handle)) break; 881 hci_con_used = 0; 882 btstack_linked_list_iterator_init(&it, &l2cap_channels); 883 while (btstack_linked_list_iterator_has_next(&it)){ 884 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 885 if (channel->handle != handle) continue; 886 hci_con_used = 1; 887 break; 888 } 889 if (hci_con_used) break; 890 if (!hci_can_send_command_packet_now()) break; 891 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 892 break; 893 894 case DAEMON_EVENT_HCI_PACKET_SENT: 895 l2cap_run(); // try sending signaling packets first 896 897 btstack_linked_list_iterator_init(&it, &l2cap_channels); 898 while (btstack_linked_list_iterator_has_next(&it)){ 899 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 900 if (!channel->packet_handler) continue; 901 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 902 } 903 break; 904 905 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 906 handle = little_endian_read_16(packet, 3); 907 btstack_linked_list_iterator_init(&it, &l2cap_channels); 908 while (btstack_linked_list_iterator_has_next(&it)){ 909 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 910 if (channel->handle != handle) continue; 911 l2cap_handle_remote_supported_features_received(channel); 912 break; 913 } 914 break; 915 916 case GAP_EVENT_SECURITY_LEVEL: 917 handle = little_endian_read_16(packet, 2); 918 log_info("l2cap - security level update"); 919 btstack_linked_list_iterator_init(&it, &l2cap_channels); 920 while (btstack_linked_list_iterator_has_next(&it)){ 921 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 922 if (channel->handle != handle) continue; 923 924 log_info("l2cap - state %u", channel->state); 925 926 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 927 gap_security_level_t required_level = channel->required_security_level; 928 929 switch (channel->state){ 930 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 931 if (actual_level >= required_level){ 932 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 933 l2cap_emit_connection_request(channel); 934 } else { 935 channel->reason = 0x0003; // security block 936 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 937 } 938 break; 939 940 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 941 if (actual_level >= required_level){ 942 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 943 } else { 944 // disconnnect, authentication not good enough 945 hci_disconnect_security_block(handle); 946 } 947 break; 948 949 default: 950 break; 951 } 952 } 953 break; 954 955 default: 956 break; 957 } 958 959 l2cap_run(); 960 } 961 962 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 963 channel->remote_sig_id = identifier; 964 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 965 l2cap_run(); 966 } 967 968 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 969 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 970 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 971 signaling_responses[signaling_responses_pending].handle = handle; 972 signaling_responses[signaling_responses_pending].code = code; 973 signaling_responses[signaling_responses_pending].sig_id = sig_id; 974 signaling_responses[signaling_responses_pending].data = data; 975 signaling_responses_pending++; 976 l2cap_run(); 977 } 978 } 979 980 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 981 982 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 983 l2cap_service_t *service = l2cap_get_service(psm); 984 if (!service) { 985 // 0x0002 PSM not supported 986 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 987 return; 988 } 989 990 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 991 if (!hci_connection) { 992 // 993 log_error("no hci_connection for handle %u", handle); 994 return; 995 } 996 997 // alloc structure 998 // log_info("l2cap_handle_connection_request register channel"); 999 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1000 if (!channel){ 1001 // 0x0004 No resources available 1002 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1003 return; 1004 } 1005 // Init memory (make valgrind happy) 1006 memset(channel, 0, sizeof(l2cap_channel_t)); 1007 // fill in 1008 BD_ADDR_COPY(channel->address, hci_connection->address); 1009 channel->psm = psm; 1010 channel->handle = handle; 1011 channel->packet_handler = service->packet_handler; 1012 channel->local_cid = l2cap_next_local_cid(); 1013 channel->remote_cid = source_cid; 1014 channel->local_mtu = service->mtu; 1015 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1016 channel->remote_sig_id = sig_id; 1017 channel->required_security_level = service->required_security_level; 1018 1019 // limit local mtu to max acl packet length - l2cap header 1020 if (channel->local_mtu > l2cap_max_mtu()) { 1021 channel->local_mtu = l2cap_max_mtu(); 1022 } 1023 1024 // set initial state 1025 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1026 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1027 1028 // add to connections list 1029 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1030 1031 // assert security requirements 1032 gap_request_security_level(handle, channel->required_security_level); 1033 } 1034 1035 void l2cap_accept_connection(uint16_t local_cid){ 1036 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1037 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1038 if (!channel) { 1039 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1040 return; 1041 } 1042 1043 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1044 1045 // process 1046 l2cap_run(); 1047 } 1048 1049 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1050 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1051 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1052 if (!channel) { 1053 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1054 return; 1055 } 1056 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1057 channel->reason = reason; 1058 l2cap_run(); 1059 } 1060 1061 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1062 1063 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1064 1065 uint16_t flags = little_endian_read_16(command, 6); 1066 if (flags & 1) { 1067 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1068 } 1069 1070 // accept the other's configuration options 1071 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1072 uint16_t pos = 8; 1073 while (pos < end_pos){ 1074 uint8_t option_hint = command[pos] >> 7; 1075 uint8_t option_type = command[pos] & 0x7f; 1076 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1077 pos++; 1078 uint8_t length = command[pos++]; 1079 // MTU { type(8): 1, len(8):2, MTU(16) } 1080 if (option_type == 1 && length == 2){ 1081 channel->remote_mtu = little_endian_read_16(command, pos); 1082 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1083 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1084 } 1085 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1086 if (option_type == 2 && length == 2){ 1087 channel->flush_timeout = little_endian_read_16(command, pos); 1088 } 1089 // check for unknown options 1090 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1091 log_info("l2cap cid %u, unknown options", channel->local_cid); 1092 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1093 } 1094 pos += length; 1095 } 1096 } 1097 1098 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1099 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1100 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1101 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1102 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1103 if (channel->state == L2CAP_STATE_OPEN) return 0; 1104 return 1; 1105 } 1106 1107 1108 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1109 1110 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1111 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1112 uint16_t result = 0; 1113 1114 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1115 1116 // handle DISCONNECT REQUESTS seperately 1117 if (code == DISCONNECTION_REQUEST){ 1118 switch (channel->state){ 1119 case L2CAP_STATE_CONFIG: 1120 case L2CAP_STATE_OPEN: 1121 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1122 case L2CAP_STATE_WAIT_DISCONNECT: 1123 l2cap_handle_disconnect_request(channel, identifier); 1124 break; 1125 1126 default: 1127 // ignore in other states 1128 break; 1129 } 1130 return; 1131 } 1132 1133 // @STATEMACHINE(l2cap) 1134 switch (channel->state) { 1135 1136 case L2CAP_STATE_WAIT_CONNECT_RSP: 1137 switch (code){ 1138 case CONNECTION_RESPONSE: 1139 l2cap_stop_rtx(channel); 1140 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1141 switch (result) { 1142 case 0: 1143 // successful connection 1144 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1145 channel->state = L2CAP_STATE_CONFIG; 1146 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1147 break; 1148 case 1: 1149 // connection pending. get some coffee, but start the ERTX 1150 l2cap_start_ertx(channel); 1151 break; 1152 default: 1153 // channel closed 1154 channel->state = L2CAP_STATE_CLOSED; 1155 // map l2cap connection response result to BTstack status enumeration 1156 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1157 1158 // drop link key if security block 1159 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1160 hci_drop_link_key_for_bd_addr(channel->address); 1161 } 1162 1163 // discard channel 1164 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1165 btstack_memory_l2cap_channel_free(channel); 1166 break; 1167 } 1168 break; 1169 1170 default: 1171 //@TODO: implement other signaling packets 1172 break; 1173 } 1174 break; 1175 1176 case L2CAP_STATE_CONFIG: 1177 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1178 switch (code) { 1179 case CONFIGURE_REQUEST: 1180 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1181 l2cap_signaling_handle_configure_request(channel, command); 1182 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1183 // only done if continuation not set 1184 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1185 } 1186 break; 1187 case CONFIGURE_RESPONSE: 1188 l2cap_stop_rtx(channel); 1189 switch (result){ 1190 case 0: // success 1191 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1192 break; 1193 case 4: // pending 1194 l2cap_start_ertx(channel); 1195 break; 1196 default: 1197 // retry on negative result 1198 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1199 break; 1200 } 1201 break; 1202 default: 1203 break; 1204 } 1205 if (l2cap_channel_ready_for_open(channel)){ 1206 // for open: 1207 channel->state = L2CAP_STATE_OPEN; 1208 l2cap_emit_channel_opened(channel, 0); 1209 } 1210 break; 1211 1212 case L2CAP_STATE_WAIT_DISCONNECT: 1213 switch (code) { 1214 case DISCONNECTION_RESPONSE: 1215 l2cap_finialize_channel_close(channel); 1216 break; 1217 default: 1218 //@TODO: implement other signaling packets 1219 break; 1220 } 1221 break; 1222 1223 case L2CAP_STATE_CLOSED: 1224 // @TODO handle incoming requests 1225 break; 1226 1227 case L2CAP_STATE_OPEN: 1228 //@TODO: implement other signaling packets, e.g. re-configure 1229 break; 1230 default: 1231 break; 1232 } 1233 // log_info("new state %u", channel->state); 1234 } 1235 1236 1237 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1238 1239 // get code, signalind identifier and command len 1240 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1241 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1242 1243 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1244 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1245 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1246 return; 1247 } 1248 1249 // general commands without an assigned channel 1250 switch(code) { 1251 1252 case CONNECTION_REQUEST: { 1253 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1254 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1255 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1256 return; 1257 } 1258 1259 case ECHO_REQUEST: 1260 l2cap_register_signaling_response(handle, code, sig_id, 0); 1261 return; 1262 1263 case INFORMATION_REQUEST: { 1264 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1265 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1266 return; 1267 } 1268 1269 default: 1270 break; 1271 } 1272 1273 1274 // Get potential destination CID 1275 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1276 1277 // Find channel for this sig_id and connection handle 1278 btstack_linked_list_iterator_t it; 1279 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1280 while (btstack_linked_list_iterator_has_next(&it)){ 1281 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1282 if (channel->handle != handle) continue; 1283 if (code & 1) { 1284 // match odd commands (responses) by previous signaling identifier 1285 if (channel->local_sig_id == sig_id) { 1286 l2cap_signaling_handler_channel(channel, command); 1287 break; 1288 } 1289 } else { 1290 // match even commands (requests) by local channel id 1291 if (channel->local_cid == dest_cid) { 1292 l2cap_signaling_handler_channel(channel, command); 1293 break; 1294 } 1295 } 1296 } 1297 } 1298 1299 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1300 1301 // Get Channel ID 1302 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1303 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1304 1305 switch (channel_id) { 1306 1307 case L2CAP_CID_SIGNALING: { 1308 1309 uint16_t command_offset = 8; 1310 while (command_offset < size) { 1311 1312 // handle signaling commands 1313 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1314 1315 // increment command_offset 1316 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1317 } 1318 break; 1319 } 1320 1321 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1322 if (attribute_protocol_packet_handler) { 1323 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1324 } 1325 break; 1326 1327 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1328 if (security_protocol_packet_handler) { 1329 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1330 } 1331 break; 1332 1333 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1334 if (connectionless_channel_packet_handler) { 1335 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1336 } 1337 break; 1338 1339 case L2CAP_CID_SIGNALING_LE: { 1340 switch (packet[8]){ 1341 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1342 uint16_t result = little_endian_read_16(packet, 12); 1343 l2cap_emit_connection_parameter_update_response(handle, result); 1344 break; 1345 } 1346 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1347 uint8_t event[10]; 1348 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1349 event[1] = 8; 1350 memcpy(&event[2], &packet[12], 8); 1351 1352 hci_connection_t * connection = hci_connection_for_handle(handle); 1353 if (connection){ 1354 if (connection->role != HCI_ROLE_MASTER){ 1355 // reject command without notifying upper layer when not in master role 1356 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1357 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1358 break; 1359 } 1360 int update_parameter = 1; 1361 le_connection_parameter_range_t existing_range; 1362 gap_le_get_connection_parameter_range(existing_range); 1363 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1364 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1365 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1366 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1367 1368 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1369 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1370 1371 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1372 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1373 1374 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1375 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1376 1377 if (update_parameter){ 1378 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1379 connection->le_conn_interval_min = le_conn_interval_min; 1380 connection->le_conn_interval_max = le_conn_interval_max; 1381 connection->le_conn_latency = le_conn_latency; 1382 connection->le_supervision_timeout = le_supervision_timeout; 1383 } else { 1384 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1385 } 1386 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1387 } 1388 1389 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1390 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1391 1392 break; 1393 } 1394 default: { 1395 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1396 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1397 break; 1398 } 1399 } 1400 break; 1401 } 1402 1403 default: { 1404 // Find channel for this channel_id and connection handle 1405 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1406 if (channel) { 1407 l2cap_dispatch_to_channel(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1408 } 1409 break; 1410 } 1411 } 1412 } 1413 1414 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1415 switch (packet_type) { 1416 case HCI_EVENT_PACKET: 1417 l2cap_event_handler(packet, size); 1418 break; 1419 case HCI_ACL_DATA_PACKET: 1420 l2cap_acl_handler(packet, size); 1421 break; 1422 default: 1423 break; 1424 } 1425 l2cap_run(); 1426 } 1427 1428 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1429 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1430 channel->state = L2CAP_STATE_CLOSED; 1431 l2cap_emit_channel_closed(channel); 1432 // discard channel 1433 l2cap_stop_rtx(channel); 1434 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1435 btstack_memory_l2cap_channel_free(channel); 1436 } 1437 1438 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1439 btstack_linked_list_iterator_t it; 1440 btstack_linked_list_iterator_init(&it, services); 1441 while (btstack_linked_list_iterator_has_next(&it)){ 1442 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1443 if ( service->psm == psm){ 1444 return service; 1445 }; 1446 } 1447 return NULL; 1448 } 1449 1450 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1451 return l2cap_get_service_internal(&l2cap_services, psm); 1452 } 1453 1454 1455 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1456 1457 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1458 1459 // check for alread registered psm 1460 // TODO: emit error event 1461 l2cap_service_t *service = l2cap_get_service(psm); 1462 if (service) { 1463 log_error("l2cap_register_service: PSM %u already registered", psm); 1464 return L2CAP_SERVICE_ALREADY_REGISTERED; 1465 } 1466 1467 // alloc structure 1468 // TODO: emit error event 1469 service = btstack_memory_l2cap_service_get(); 1470 if (!service) { 1471 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1472 return BTSTACK_MEMORY_ALLOC_FAILED; 1473 } 1474 1475 // fill in 1476 service->psm = psm; 1477 service->mtu = mtu; 1478 service->packet_handler = service_packet_handler; 1479 service->required_security_level = security_level; 1480 1481 // add to services list 1482 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1483 1484 // enable page scan 1485 hci_connectable_control(1); 1486 1487 return 0; 1488 } 1489 1490 void l2cap_unregister_service(uint16_t psm){ 1491 1492 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1493 1494 l2cap_service_t *service = l2cap_get_service(psm); 1495 if (!service) return; 1496 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1497 btstack_memory_l2cap_service_free(service); 1498 1499 // disable page scan when no services registered 1500 if (!btstack_linked_list_empty(&l2cap_services)) return; 1501 hci_connectable_control(0); 1502 } 1503 1504 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1505 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1506 switch(channel_id){ 1507 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1508 attribute_protocol_packet_handler = the_packet_handler; 1509 break; 1510 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1511 security_protocol_packet_handler = the_packet_handler; 1512 break; 1513 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1514 connectionless_channel_packet_handler = the_packet_handler; 1515 break; 1516 } 1517 } 1518 1519 #ifdef ENABLE_BLE 1520 1521 1522 #if 0 1523 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1524 return l2cap_get_service_internal(&l2cap_le_services, psm); 1525 } 1526 /** 1527 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1528 * @param 1529 */ 1530 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1531 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1532 1533 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1534 1535 // check for alread registered psm 1536 // TODO: emit error event 1537 l2cap_service_t *service = l2cap_le_get_service(psm); 1538 if (service) { 1539 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1540 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1541 return; 1542 } 1543 1544 // alloc structure 1545 // TODO: emit error event 1546 service = btstack_memory_l2cap_service_get(); 1547 if (!service) { 1548 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1549 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1550 return; 1551 } 1552 1553 // fill in 1554 service->psm = psm; 1555 service->mtu = mtu; 1556 service->mps = mps; 1557 service->packet_handler = packet_handler; 1558 service->required_security_level = security_level; 1559 1560 // add to services list 1561 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1562 1563 // done 1564 l2cap_emit_service_registered(connection, 0, psm); 1565 } 1566 1567 void l2cap_le_unregister_service(uint16_t psm) { 1568 1569 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1570 1571 l2cap_service_t *service = l2cap_le_get_service(psm); 1572 if (!service) return; 1573 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1574 btstack_memory_l2cap_service_free(service); 1575 } 1576 #endif 1577 #endif 1578