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 // prototypes 70 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 71 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 72 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 73 static void l2cap_emit_can_send_now(l2cap_channel_t *channel); 74 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 75 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 76 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 77 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 78 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ); 79 80 81 // used to cache l2cap rejects, echo, and informational requests 82 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 83 static int signaling_responses_pending; 84 85 static uint8_t require_security_level2_for_outgoing_sdp; 86 87 static btstack_packet_callback_registration_t hci_event_callback_registration; 88 89 static btstack_linked_list_t l2cap_channels; 90 static btstack_linked_list_t l2cap_services; 91 static btstack_linked_list_t l2cap_le_channels; 92 static btstack_linked_list_t l2cap_le_services; 93 94 static btstack_packet_handler_t attribute_protocol_packet_handler; 95 static btstack_packet_handler_t security_protocol_packet_handler; 96 static btstack_packet_handler_t connectionless_channel_packet_handler; 97 static btstack_packet_handler_t l2cap_event_packet_handler; 98 99 100 void l2cap_init(void){ 101 signaling_responses_pending = 0; 102 103 l2cap_channels = NULL; 104 l2cap_services = NULL; 105 l2cap_le_services = NULL; 106 l2cap_le_channels = NULL; 107 108 l2cap_event_packet_handler = NULL; 109 attribute_protocol_packet_handler = NULL; 110 security_protocol_packet_handler = NULL; 111 connectionless_channel_packet_handler = NULL; 112 113 require_security_level2_for_outgoing_sdp = 0; 114 115 // 116 // register callback with HCI 117 // 118 hci_event_callback_registration.callback = &l2cap_hci_event_handler; 119 hci_add_event_handler(&hci_event_callback_registration); 120 121 hci_register_acl_packet_handler(&l2cap_acl_handler); 122 123 hci_connectable_control(0); // no services yet 124 } 125 126 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 127 l2cap_event_packet_handler = handler; 128 } 129 130 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 131 (* (channel->packet_handler))(type, channel->local_cid, data, size); 132 } 133 134 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 135 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", 136 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 137 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 138 uint8_t event[23]; 139 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 140 event[1] = sizeof(event) - 2; 141 event[2] = status; 142 bt_flip_addr(&event[3], channel->address); 143 little_endian_store_16(event, 9, channel->handle); 144 little_endian_store_16(event, 11, channel->psm); 145 little_endian_store_16(event, 13, channel->local_cid); 146 little_endian_store_16(event, 15, channel->remote_cid); 147 little_endian_store_16(event, 17, channel->local_mtu); 148 little_endian_store_16(event, 19, channel->remote_mtu); 149 little_endian_store_16(event, 21, channel->flush_timeout); 150 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 151 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 152 153 // if channel opened successfully, also send can send now if possible 154 if (status) return; 155 if (hci_can_send_acl_packet_now(channel->handle)){ 156 l2cap_emit_can_send_now(channel); 157 } else { 158 channel->waiting_for_can_send_now = 1; 159 } 160 } 161 162 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 163 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 164 uint8_t event[4]; 165 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 166 event[1] = sizeof(event) - 2; 167 little_endian_store_16(event, 2, channel->local_cid); 168 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 169 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 170 } 171 172 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 173 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 174 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 175 uint8_t event[16]; 176 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 177 event[1] = sizeof(event) - 2; 178 bt_flip_addr(&event[2], channel->address); 179 little_endian_store_16(event, 8, channel->handle); 180 little_endian_store_16(event, 10, channel->psm); 181 little_endian_store_16(event, 12, channel->local_cid); 182 little_endian_store_16(event, 14, channel->remote_cid); 183 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 184 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 185 } 186 187 static void l2cap_emit_can_send_now(l2cap_channel_t *channel) { 188 log_info("L2CAP_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel->local_cid); 189 uint8_t event[4]; 190 event[0] = L2CAP_EVENT_CAN_SEND_NOW; 191 event[1] = sizeof(event) - 2; 192 little_endian_store_16(event, 2, channel->local_cid); 193 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 194 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 195 } 196 197 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 198 uint8_t event[6]; 199 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 200 event[1] = 4; 201 little_endian_store_16(event, 2, handle); 202 little_endian_store_16(event, 4, result); 203 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 204 if (!l2cap_event_packet_handler) return; 205 (*l2cap_event_packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 206 } 207 208 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 209 btstack_linked_list_iterator_t it; 210 btstack_linked_list_iterator_init(&it, &l2cap_channels); 211 while (btstack_linked_list_iterator_has_next(&it)){ 212 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 213 if ( channel->local_cid == local_cid) { 214 return channel; 215 } 216 } 217 return NULL; 218 } 219 220 int l2cap_can_send_packet_now(uint16_t local_cid){ 221 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 222 if (!channel) return 0; 223 int can_send = hci_can_send_acl_packet_now(channel->handle); 224 if (!can_send){ 225 channel->waiting_for_can_send_now = 1; 226 } 227 return can_send; 228 } 229 230 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 231 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 232 if (!channel) return 0; 233 int can_send = hci_can_send_prepared_acl_packet_now(channel->handle); 234 if (!can_send){ 235 channel->waiting_for_can_send_now = 1; 236 } 237 return can_send; 238 } 239 240 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 241 return hci_can_send_acl_packet_now(handle); 242 } 243 244 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 245 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 246 if (channel) { 247 return channel->remote_mtu; 248 } 249 return 0; 250 } 251 252 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 253 btstack_linked_list_iterator_t it; 254 btstack_linked_list_iterator_init(&it, &l2cap_channels); 255 while (btstack_linked_list_iterator_has_next(&it)){ 256 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 257 if ( &channel->rtx == ts) { 258 return channel; 259 } 260 } 261 return NULL; 262 } 263 264 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 265 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 266 if (!ts) return; 267 268 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 269 270 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 271 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 272 // notify client 273 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 274 275 // discard channel 276 // no need to stop timer here, it is removed from list during timer callback 277 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 278 btstack_memory_l2cap_channel_free(channel); 279 } 280 281 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 282 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 283 btstack_run_loop_remove_timer(&channel->rtx); 284 } 285 286 static void l2cap_start_rtx(l2cap_channel_t * channel){ 287 l2cap_stop_rtx(channel); 288 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 289 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 290 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 291 btstack_run_loop_add_timer(&channel->rtx); 292 } 293 294 static void l2cap_start_ertx(l2cap_channel_t * channel){ 295 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 296 l2cap_stop_rtx(channel); 297 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 298 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 299 btstack_run_loop_add_timer(&channel->rtx); 300 } 301 302 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 303 require_security_level2_for_outgoing_sdp = 1; 304 } 305 306 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 307 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 308 } 309 310 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 311 312 if (!hci_can_send_acl_packet_now(handle)){ 313 log_info("l2cap_send_signaling_packet, cannot send"); 314 return BTSTACK_ACL_BUFFERS_FULL; 315 } 316 317 // log_info("l2cap_send_signaling_packet type %u", cmd); 318 hci_reserve_packet_buffer(); 319 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 320 va_list argptr; 321 va_start(argptr, identifier); 322 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 323 va_end(argptr); 324 // log_info("l2cap_send_signaling_packet con %u!", handle); 325 return hci_send_acl_packet_buffer(len); 326 } 327 328 #ifdef ENABLE_BLE 329 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 330 331 if (!hci_can_send_acl_packet_now(handle)){ 332 log_info("l2cap_send_signaling_packet, cannot send"); 333 return BTSTACK_ACL_BUFFERS_FULL; 334 } 335 336 // log_info("l2cap_send_signaling_packet type %u", cmd); 337 hci_reserve_packet_buffer(); 338 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 339 va_list argptr; 340 va_start(argptr, identifier); 341 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 342 va_end(argptr); 343 // log_info("l2cap_send_signaling_packet con %u!", handle); 344 return hci_send_acl_packet_buffer(len); 345 } 346 #endif 347 348 uint8_t *l2cap_get_outgoing_buffer(void){ 349 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 350 } 351 352 int l2cap_reserve_packet_buffer(void){ 353 return hci_reserve_packet_buffer(); 354 } 355 356 void l2cap_release_packet_buffer(void){ 357 hci_release_packet_buffer(); 358 } 359 360 361 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 362 363 if (!hci_is_packet_buffer_reserved()){ 364 log_error("l2cap_send_prepared called without reserving packet first"); 365 return BTSTACK_ACL_BUFFERS_FULL; 366 } 367 368 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 369 if (!channel) { 370 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 371 return -1; // TODO: define error 372 } 373 374 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 375 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 376 return BTSTACK_ACL_BUFFERS_FULL; 377 } 378 379 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 380 381 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 382 383 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 384 385 // 0 - Connection handle : PB=pb : BC=00 386 little_endian_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 387 // 2 - ACL length 388 little_endian_store_16(acl_buffer, 2, len + 4); 389 // 4 - L2CAP packet length 390 little_endian_store_16(acl_buffer, 4, len + 0); 391 // 6 - L2CAP channel DEST 392 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 393 // send 394 int err = hci_send_acl_packet_buffer(len+8); 395 396 return err; 397 } 398 399 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 400 401 if (!hci_is_packet_buffer_reserved()){ 402 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 403 return BTSTACK_ACL_BUFFERS_FULL; 404 } 405 406 if (!hci_can_send_prepared_acl_packet_now(handle)){ 407 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 408 return BTSTACK_ACL_BUFFERS_FULL; 409 } 410 411 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 412 413 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 414 415 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 416 417 // 0 - Connection handle : PB=pb : BC=00 418 little_endian_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 419 // 2 - ACL length 420 little_endian_store_16(acl_buffer, 2, len + 4); 421 // 4 - L2CAP packet length 422 little_endian_store_16(acl_buffer, 4, len + 0); 423 // 6 - L2CAP channel DEST 424 little_endian_store_16(acl_buffer, 6, cid); 425 // send 426 int err = hci_send_acl_packet_buffer(len+8); 427 428 return err; 429 } 430 431 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 432 433 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 434 if (!channel) { 435 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 436 return -1; // TODO: define error 437 } 438 439 if (len > channel->remote_mtu){ 440 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 441 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 442 } 443 444 if (!hci_can_send_acl_packet_now(channel->handle)){ 445 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 446 return BTSTACK_ACL_BUFFERS_FULL; 447 } 448 449 hci_reserve_packet_buffer(); 450 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 451 452 memcpy(&acl_buffer[8], data, len); 453 454 return l2cap_send_prepared(local_cid, len); 455 } 456 457 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 458 459 if (!hci_can_send_acl_packet_now(handle)){ 460 log_info("l2cap_send cid 0x%02x, cannot send", cid); 461 return BTSTACK_ACL_BUFFERS_FULL; 462 } 463 464 hci_reserve_packet_buffer(); 465 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 466 467 memcpy(&acl_buffer[8], data, len); 468 469 return l2cap_send_prepared_connectionless(handle, cid, len); 470 } 471 472 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 473 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 474 } 475 476 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 477 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 478 } 479 480 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 481 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 482 } 483 484 485 486 // MARK: L2CAP_RUN 487 // process outstanding signaling tasks 488 static void l2cap_run(void){ 489 490 // log_info("l2cap_run: entered"); 491 492 // check pending signaling responses 493 while (signaling_responses_pending){ 494 495 hci_con_handle_t handle = signaling_responses[0].handle; 496 497 if (!hci_can_send_acl_packet_now(handle)) break; 498 499 uint8_t sig_id = signaling_responses[0].sig_id; 500 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 501 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 502 uint8_t response_code = signaling_responses[0].code; 503 504 // remove first item before sending (to avoid sending response mutliple times) 505 signaling_responses_pending--; 506 int i; 507 for (i=0; i < signaling_responses_pending; i++){ 508 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 509 } 510 511 switch (response_code){ 512 case CONNECTION_REQUEST: 513 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 514 // also disconnect if result is 0x0003 - security blocked 515 if (result == 0x0003){ 516 hci_disconnect_security_block(handle); 517 } 518 break; 519 case ECHO_REQUEST: 520 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 521 break; 522 case INFORMATION_REQUEST: 523 switch (infoType){ 524 case 1: { // Connectionless MTU 525 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 526 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 527 break; 528 } 529 case 2: { // Extended Features Supported 530 // extended features request supported, features: fixed channels, unicast connectionless data reception 531 uint32_t features = 0x280; 532 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 533 break; 534 } 535 case 3: { // Fixed Channels Supported 536 uint8_t map[8]; 537 memset(map, 0, 8); 538 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 539 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 540 break; 541 } 542 default: 543 // all other types are not supported 544 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 545 break; 546 } 547 break; 548 case COMMAND_REJECT: 549 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 550 #ifdef ENABLE_BLE 551 case COMMAND_REJECT_LE: 552 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 553 break; 554 #endif 555 default: 556 // should not happen 557 break; 558 } 559 } 560 561 uint8_t config_options[4]; 562 btstack_linked_list_iterator_t it; 563 btstack_linked_list_iterator_init(&it, &l2cap_channels); 564 while (btstack_linked_list_iterator_has_next(&it)){ 565 566 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 567 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 568 switch (channel->state){ 569 570 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 571 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 572 if (!hci_can_send_acl_packet_now(channel->handle)) break; 573 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 574 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 575 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 576 } 577 break; 578 579 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 580 if (!hci_can_send_command_packet_now()) break; 581 // send connection request - set state first 582 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 583 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 584 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 585 break; 586 587 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 588 if (!hci_can_send_acl_packet_now(channel->handle)) break; 589 channel->state = L2CAP_STATE_INVALID; 590 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 591 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 592 l2cap_stop_rtx(channel); 593 btstack_linked_list_iterator_remove(&it); 594 btstack_memory_l2cap_channel_free(channel); 595 break; 596 597 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 598 if (!hci_can_send_acl_packet_now(channel->handle)) break; 599 channel->state = L2CAP_STATE_CONFIG; 600 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 601 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 602 break; 603 604 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 605 if (!hci_can_send_acl_packet_now(channel->handle)) break; 606 // success, start l2cap handshake 607 channel->local_sig_id = l2cap_next_sig_id(); 608 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 609 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 610 l2cap_start_rtx(channel); 611 break; 612 613 case L2CAP_STATE_CONFIG: 614 if (!hci_can_send_acl_packet_now(channel->handle)) break; 615 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 616 uint16_t flags = 0; 617 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 618 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 619 flags = 1; 620 } else { 621 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 622 } 623 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 624 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 625 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 626 config_options[0] = 1; // MTU 627 config_options[1] = 2; // len param 628 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 629 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 630 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 631 } else { 632 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 633 } 634 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 635 } 636 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 637 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 638 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 639 channel->local_sig_id = l2cap_next_sig_id(); 640 config_options[0] = 1; // MTU 641 config_options[1] = 2; // len param 642 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 643 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 644 l2cap_start_rtx(channel); 645 } 646 if (l2cap_channel_ready_for_open(channel)){ 647 channel->state = L2CAP_STATE_OPEN; 648 l2cap_emit_channel_opened(channel, 0); // success 649 } 650 break; 651 652 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 653 if (!hci_can_send_acl_packet_now(channel->handle)) break; 654 channel->state = L2CAP_STATE_INVALID; 655 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 656 // 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 :) 657 l2cap_finialize_channel_close(channel); // -- remove from list 658 break; 659 660 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 661 if (!hci_can_send_acl_packet_now(channel->handle)) break; 662 channel->local_sig_id = l2cap_next_sig_id(); 663 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 664 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 665 break; 666 default: 667 break; 668 } 669 } 670 671 #ifdef ENABLE_BLE 672 // send l2cap con paramter update if necessary 673 hci_connections_get_iterator(&it); 674 while(btstack_linked_list_iterator_has_next(&it)){ 675 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 676 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 677 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 678 switch (connection->le_con_parameter_update_state){ 679 case CON_PARAMETER_UPDATE_SEND_REQUEST: 680 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 681 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 682 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 683 break; 684 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 685 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 686 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 687 break; 688 case CON_PARAMETER_UPDATE_DENY: 689 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 690 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 691 break; 692 default: 693 break; 694 } 695 } 696 #endif 697 698 // log_info("l2cap_run: exit"); 699 } 700 701 uint16_t l2cap_max_mtu(void){ 702 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 703 } 704 705 uint16_t l2cap_max_le_mtu(void){ 706 return l2cap_max_mtu(); 707 } 708 709 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 710 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 711 log_info("l2cap_handle_connection_complete expected state"); 712 // success, start l2cap handshake 713 channel->handle = handle; 714 // check remote SSP feature first 715 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 716 } 717 } 718 719 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 720 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 721 722 // we have been waiting for remote supported features, if both support SSP, 723 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)); 724 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 725 // request security level 2 726 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 727 gap_request_security_level(channel->handle, LEVEL_2); 728 return; 729 } 730 // fine, go ahead 731 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 732 } 733 734 /** 735 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 736 * @param packet_handler 737 * @param address 738 * @param psm 739 * @param mtu 740 * @param local_cid 741 */ 742 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){ 743 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 744 745 // alloc structure 746 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 747 if (!chan) { 748 return BTSTACK_MEMORY_ALLOC_FAILED; 749 } 750 751 // Init memory (make valgrind happy) 752 memset(chan, 0, sizeof(l2cap_channel_t)); 753 // limit local mtu to max acl packet length - l2cap header 754 if (mtu > l2cap_max_mtu()) { 755 mtu = l2cap_max_mtu(); 756 } 757 758 // fill in 759 BD_ADDR_COPY(chan->address, address); 760 chan->psm = psm; 761 chan->handle = 0; 762 chan->packet_handler = channel_packet_handler; 763 chan->remote_mtu = L2CAP_MINIMAL_MTU; 764 chan->local_mtu = mtu; 765 chan->local_cid = l2cap_next_local_cid(); 766 767 // set initial state 768 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 769 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 770 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 771 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 772 chan->required_security_level = LEVEL_0; 773 774 // add to connections list 775 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 776 777 // store local_cid 778 if (out_local_cid){ 779 *out_local_cid = chan->local_cid; 780 } 781 782 // check if hci connection is already usable 783 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 784 if (conn){ 785 log_info("l2cap_create_channel, hci connection already exists"); 786 l2cap_handle_connection_complete(conn->con_handle, chan); 787 // check if remote supported fearures are already received 788 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 789 l2cap_handle_remote_supported_features_received(chan); 790 } 791 } 792 793 l2cap_run(); 794 795 return 0; 796 } 797 798 void 799 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 800 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 801 // find channel for local_cid 802 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 803 if (channel) { 804 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 805 } 806 // process 807 l2cap_run(); 808 } 809 810 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 811 btstack_linked_list_iterator_t it; 812 btstack_linked_list_iterator_init(&it, &l2cap_channels); 813 while (btstack_linked_list_iterator_has_next(&it)){ 814 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 815 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 816 // channel for this address found 817 switch (channel->state){ 818 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 819 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 820 // failure, forward error code 821 l2cap_emit_channel_opened(channel, status); 822 // discard channel 823 l2cap_stop_rtx(channel); 824 btstack_linked_list_iterator_remove(&it); 825 btstack_memory_l2cap_channel_free(channel); 826 break; 827 default: 828 break; 829 } 830 } 831 } 832 833 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 834 btstack_linked_list_iterator_t it; 835 btstack_linked_list_iterator_init(&it, &l2cap_channels); 836 while (btstack_linked_list_iterator_has_next(&it)){ 837 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 838 if ( ! BD_ADDR_CMP( channel->address, address) ){ 839 l2cap_handle_connection_complete(handle, channel); 840 } 841 } 842 // process 843 l2cap_run(); 844 } 845 846 static void l2cap_notify_channel_can_send(void){ 847 btstack_linked_list_iterator_t it; 848 btstack_linked_list_iterator_init(&it, &l2cap_channels); 849 while (btstack_linked_list_iterator_has_next(&it)){ 850 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 851 if (!channel->waiting_for_can_send_now) continue; 852 if (!hci_can_send_acl_packet_now(channel->handle)) continue; 853 channel->waiting_for_can_send_now = 0; 854 l2cap_emit_can_send_now(channel); 855 } 856 } 857 858 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 859 860 bd_addr_t address; 861 hci_con_handle_t handle; 862 btstack_linked_list_iterator_t it; 863 int hci_con_used; 864 865 switch(packet[0]){ 866 867 // handle connection complete events 868 case HCI_EVENT_CONNECTION_COMPLETE: 869 bt_flip_addr(address, &packet[5]); 870 if (packet[2] == 0){ 871 handle = little_endian_read_16(packet, 3); 872 l2cap_handle_connection_success_for_addr(address, handle); 873 } else { 874 l2cap_handle_connection_failed_for_addr(address, packet[2]); 875 } 876 break; 877 878 // handle successful create connection cancel command 879 case HCI_EVENT_COMMAND_COMPLETE: 880 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 881 if (packet[5] == 0){ 882 bt_flip_addr(address, &packet[6]); 883 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 884 l2cap_handle_connection_failed_for_addr(address, 0x16); 885 } 886 } 887 l2cap_run(); // try sending signaling packets first 888 break; 889 890 case HCI_EVENT_COMMAND_STATUS: 891 l2cap_run(); // try sending signaling packets first 892 break; 893 894 // handle disconnection complete events 895 case HCI_EVENT_DISCONNECTION_COMPLETE: 896 // send l2cap disconnect events for all channels on this handle and free them 897 handle = little_endian_read_16(packet, 3); 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->handle != handle) continue; 902 l2cap_emit_channel_closed(channel); 903 l2cap_stop_rtx(channel); 904 btstack_linked_list_iterator_remove(&it); 905 btstack_memory_l2cap_channel_free(channel); 906 } 907 break; 908 909 // Notify channel packet handler if they can send now 910 case DAEMON_EVENT_HCI_PACKET_SENT: 911 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 912 l2cap_run(); // try sending signaling packets first 913 l2cap_notify_channel_can_send(); 914 break; 915 916 // HCI Connection Timeouts 917 case L2CAP_EVENT_TIMEOUT_CHECK: 918 handle = little_endian_read_16(packet, 2); 919 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 920 if (hci_authentication_active_for_handle(handle)) break; 921 hci_con_used = 0; 922 btstack_linked_list_iterator_init(&it, &l2cap_channels); 923 while (btstack_linked_list_iterator_has_next(&it)){ 924 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 925 if (channel->handle != handle) continue; 926 hci_con_used = 1; 927 break; 928 } 929 if (hci_con_used) break; 930 if (!hci_can_send_command_packet_now()) break; 931 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 932 break; 933 934 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 935 handle = little_endian_read_16(packet, 3); 936 btstack_linked_list_iterator_init(&it, &l2cap_channels); 937 while (btstack_linked_list_iterator_has_next(&it)){ 938 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 939 if (channel->handle != handle) continue; 940 l2cap_handle_remote_supported_features_received(channel); 941 break; 942 } 943 break; 944 945 case GAP_EVENT_SECURITY_LEVEL: 946 handle = little_endian_read_16(packet, 2); 947 log_info("l2cap - security level update"); 948 btstack_linked_list_iterator_init(&it, &l2cap_channels); 949 while (btstack_linked_list_iterator_has_next(&it)){ 950 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 951 if (channel->handle != handle) continue; 952 953 log_info("l2cap - state %u", channel->state); 954 955 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 956 gap_security_level_t required_level = channel->required_security_level; 957 958 switch (channel->state){ 959 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 960 if (actual_level >= required_level){ 961 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 962 l2cap_emit_connection_request(channel); 963 } else { 964 channel->reason = 0x0003; // security block 965 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 966 } 967 break; 968 969 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 970 if (actual_level >= required_level){ 971 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 972 } else { 973 // disconnnect, authentication not good enough 974 hci_disconnect_security_block(handle); 975 } 976 break; 977 978 default: 979 break; 980 } 981 } 982 break; 983 984 default: 985 break; 986 } 987 988 l2cap_run(); 989 } 990 991 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 992 channel->remote_sig_id = identifier; 993 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 994 l2cap_run(); 995 } 996 997 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 998 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 999 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1000 signaling_responses[signaling_responses_pending].handle = handle; 1001 signaling_responses[signaling_responses_pending].code = code; 1002 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1003 signaling_responses[signaling_responses_pending].data = data; 1004 signaling_responses_pending++; 1005 l2cap_run(); 1006 } 1007 } 1008 1009 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1010 1011 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1012 l2cap_service_t *service = l2cap_get_service(psm); 1013 if (!service) { 1014 // 0x0002 PSM not supported 1015 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1016 return; 1017 } 1018 1019 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1020 if (!hci_connection) { 1021 // 1022 log_error("no hci_connection for handle %u", handle); 1023 return; 1024 } 1025 1026 // alloc structure 1027 // log_info("l2cap_handle_connection_request register channel"); 1028 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1029 if (!channel){ 1030 // 0x0004 No resources available 1031 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1032 return; 1033 } 1034 // Init memory (make valgrind happy) 1035 memset(channel, 0, sizeof(l2cap_channel_t)); 1036 // fill in 1037 BD_ADDR_COPY(channel->address, hci_connection->address); 1038 channel->psm = psm; 1039 channel->handle = handle; 1040 channel->packet_handler = service->packet_handler; 1041 channel->local_cid = l2cap_next_local_cid(); 1042 channel->remote_cid = source_cid; 1043 channel->local_mtu = service->mtu; 1044 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1045 channel->remote_sig_id = sig_id; 1046 channel->required_security_level = service->required_security_level; 1047 1048 // limit local mtu to max acl packet length - l2cap header 1049 if (channel->local_mtu > l2cap_max_mtu()) { 1050 channel->local_mtu = l2cap_max_mtu(); 1051 } 1052 1053 // set initial state 1054 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1055 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1056 1057 // add to connections list 1058 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1059 1060 // assert security requirements 1061 gap_request_security_level(handle, channel->required_security_level); 1062 } 1063 1064 void l2cap_accept_connection(uint16_t local_cid){ 1065 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1066 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1067 if (!channel) { 1068 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1069 return; 1070 } 1071 1072 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1073 1074 // process 1075 l2cap_run(); 1076 } 1077 1078 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1079 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1080 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1081 if (!channel) { 1082 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1083 return; 1084 } 1085 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1086 channel->reason = reason; 1087 l2cap_run(); 1088 } 1089 1090 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1091 1092 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1093 1094 uint16_t flags = little_endian_read_16(command, 6); 1095 if (flags & 1) { 1096 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1097 } 1098 1099 // accept the other's configuration options 1100 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1101 uint16_t pos = 8; 1102 while (pos < end_pos){ 1103 uint8_t option_hint = command[pos] >> 7; 1104 uint8_t option_type = command[pos] & 0x7f; 1105 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1106 pos++; 1107 uint8_t length = command[pos++]; 1108 // MTU { type(8): 1, len(8):2, MTU(16) } 1109 if (option_type == 1 && length == 2){ 1110 channel->remote_mtu = little_endian_read_16(command, pos); 1111 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1112 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1113 } 1114 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1115 if (option_type == 2 && length == 2){ 1116 channel->flush_timeout = little_endian_read_16(command, pos); 1117 } 1118 // check for unknown options 1119 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1120 log_info("l2cap cid %u, unknown options", channel->local_cid); 1121 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1122 } 1123 pos += length; 1124 } 1125 } 1126 1127 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1128 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1129 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1130 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1131 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1132 if (channel->state == L2CAP_STATE_OPEN) return 0; 1133 return 1; 1134 } 1135 1136 1137 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1138 1139 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1140 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1141 uint16_t result = 0; 1142 1143 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1144 1145 // handle DISCONNECT REQUESTS seperately 1146 if (code == DISCONNECTION_REQUEST){ 1147 switch (channel->state){ 1148 case L2CAP_STATE_CONFIG: 1149 case L2CAP_STATE_OPEN: 1150 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1151 case L2CAP_STATE_WAIT_DISCONNECT: 1152 l2cap_handle_disconnect_request(channel, identifier); 1153 break; 1154 1155 default: 1156 // ignore in other states 1157 break; 1158 } 1159 return; 1160 } 1161 1162 // @STATEMACHINE(l2cap) 1163 switch (channel->state) { 1164 1165 case L2CAP_STATE_WAIT_CONNECT_RSP: 1166 switch (code){ 1167 case CONNECTION_RESPONSE: 1168 l2cap_stop_rtx(channel); 1169 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1170 switch (result) { 1171 case 0: 1172 // successful connection 1173 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1174 channel->state = L2CAP_STATE_CONFIG; 1175 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1176 break; 1177 case 1: 1178 // connection pending. get some coffee, but start the ERTX 1179 l2cap_start_ertx(channel); 1180 break; 1181 default: 1182 // channel closed 1183 channel->state = L2CAP_STATE_CLOSED; 1184 // map l2cap connection response result to BTstack status enumeration 1185 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1186 1187 // drop link key if security block 1188 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1189 hci_drop_link_key_for_bd_addr(channel->address); 1190 } 1191 1192 // discard channel 1193 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1194 btstack_memory_l2cap_channel_free(channel); 1195 break; 1196 } 1197 break; 1198 1199 default: 1200 //@TODO: implement other signaling packets 1201 break; 1202 } 1203 break; 1204 1205 case L2CAP_STATE_CONFIG: 1206 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1207 switch (code) { 1208 case CONFIGURE_REQUEST: 1209 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1210 l2cap_signaling_handle_configure_request(channel, command); 1211 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1212 // only done if continuation not set 1213 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1214 } 1215 break; 1216 case CONFIGURE_RESPONSE: 1217 l2cap_stop_rtx(channel); 1218 switch (result){ 1219 case 0: // success 1220 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1221 break; 1222 case 4: // pending 1223 l2cap_start_ertx(channel); 1224 break; 1225 default: 1226 // retry on negative result 1227 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1228 break; 1229 } 1230 break; 1231 default: 1232 break; 1233 } 1234 if (l2cap_channel_ready_for_open(channel)){ 1235 // for open: 1236 channel->state = L2CAP_STATE_OPEN; 1237 l2cap_emit_channel_opened(channel, 0); 1238 } 1239 break; 1240 1241 case L2CAP_STATE_WAIT_DISCONNECT: 1242 switch (code) { 1243 case DISCONNECTION_RESPONSE: 1244 l2cap_finialize_channel_close(channel); 1245 break; 1246 default: 1247 //@TODO: implement other signaling packets 1248 break; 1249 } 1250 break; 1251 1252 case L2CAP_STATE_CLOSED: 1253 // @TODO handle incoming requests 1254 break; 1255 1256 case L2CAP_STATE_OPEN: 1257 //@TODO: implement other signaling packets, e.g. re-configure 1258 break; 1259 default: 1260 break; 1261 } 1262 // log_info("new state %u", channel->state); 1263 } 1264 1265 1266 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1267 1268 // get code, signalind identifier and command len 1269 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1270 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1271 1272 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1273 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1274 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1275 return; 1276 } 1277 1278 // general commands without an assigned channel 1279 switch(code) { 1280 1281 case CONNECTION_REQUEST: { 1282 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1283 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1284 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1285 return; 1286 } 1287 1288 case ECHO_REQUEST: 1289 l2cap_register_signaling_response(handle, code, sig_id, 0); 1290 return; 1291 1292 case INFORMATION_REQUEST: { 1293 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1294 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1295 return; 1296 } 1297 1298 default: 1299 break; 1300 } 1301 1302 1303 // Get potential destination CID 1304 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1305 1306 // Find channel for this sig_id and connection handle 1307 btstack_linked_list_iterator_t it; 1308 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1309 while (btstack_linked_list_iterator_has_next(&it)){ 1310 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1311 if (channel->handle != handle) continue; 1312 if (code & 1) { 1313 // match odd commands (responses) by previous signaling identifier 1314 if (channel->local_sig_id == sig_id) { 1315 l2cap_signaling_handler_channel(channel, command); 1316 break; 1317 } 1318 } else { 1319 // match even commands (requests) by local channel id 1320 if (channel->local_cid == dest_cid) { 1321 l2cap_signaling_handler_channel(channel, command); 1322 break; 1323 } 1324 } 1325 } 1326 } 1327 1328 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ){ 1329 1330 // Get Channel ID 1331 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1332 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1333 1334 switch (channel_id) { 1335 1336 case L2CAP_CID_SIGNALING: { 1337 1338 uint16_t command_offset = 8; 1339 while (command_offset < size) { 1340 1341 // handle signaling commands 1342 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1343 1344 // increment command_offset 1345 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1346 } 1347 break; 1348 } 1349 1350 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1351 if (attribute_protocol_packet_handler) { 1352 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1353 } 1354 break; 1355 1356 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1357 if (security_protocol_packet_handler) { 1358 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1359 } 1360 break; 1361 1362 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1363 if (connectionless_channel_packet_handler) { 1364 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1365 } 1366 break; 1367 1368 case L2CAP_CID_SIGNALING_LE: { 1369 switch (packet[8]){ 1370 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1371 uint16_t result = little_endian_read_16(packet, 12); 1372 l2cap_emit_connection_parameter_update_response(handle, result); 1373 break; 1374 } 1375 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1376 uint8_t event[10]; 1377 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1378 event[1] = 8; 1379 memcpy(&event[2], &packet[12], 8); 1380 1381 hci_connection_t * connection = hci_connection_for_handle(handle); 1382 if (connection){ 1383 if (connection->role != HCI_ROLE_MASTER){ 1384 // reject command without notifying upper layer when not in master role 1385 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1386 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1387 break; 1388 } 1389 int update_parameter = 1; 1390 le_connection_parameter_range_t existing_range; 1391 gap_le_get_connection_parameter_range(existing_range); 1392 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1393 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1394 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1395 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1396 1397 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1398 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1399 1400 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1401 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1402 1403 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1404 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1405 1406 if (update_parameter){ 1407 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1408 connection->le_conn_interval_min = le_conn_interval_min; 1409 connection->le_conn_interval_max = le_conn_interval_max; 1410 connection->le_conn_latency = le_conn_latency; 1411 connection->le_supervision_timeout = le_supervision_timeout; 1412 } else { 1413 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1414 } 1415 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1416 } 1417 1418 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1419 if (!l2cap_event_packet_handler) break; 1420 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1421 break; 1422 } 1423 default: { 1424 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1425 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1426 break; 1427 } 1428 } 1429 break; 1430 } 1431 1432 default: { 1433 // Find channel for this channel_id and connection handle 1434 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1435 if (channel) { 1436 l2cap_dispatch_to_channel(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1437 } 1438 break; 1439 } 1440 } 1441 1442 l2cap_run(); 1443 } 1444 1445 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1446 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1447 channel->state = L2CAP_STATE_CLOSED; 1448 l2cap_emit_channel_closed(channel); 1449 // discard channel 1450 l2cap_stop_rtx(channel); 1451 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1452 btstack_memory_l2cap_channel_free(channel); 1453 } 1454 1455 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1456 btstack_linked_list_iterator_t it; 1457 btstack_linked_list_iterator_init(&it, services); 1458 while (btstack_linked_list_iterator_has_next(&it)){ 1459 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1460 if ( service->psm == psm){ 1461 return service; 1462 }; 1463 } 1464 return NULL; 1465 } 1466 1467 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1468 return l2cap_get_service_internal(&l2cap_services, psm); 1469 } 1470 1471 1472 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1473 1474 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1475 1476 // check for alread registered psm 1477 // TODO: emit error event 1478 l2cap_service_t *service = l2cap_get_service(psm); 1479 if (service) { 1480 log_error("l2cap_register_service: PSM %u already registered", psm); 1481 return L2CAP_SERVICE_ALREADY_REGISTERED; 1482 } 1483 1484 // alloc structure 1485 // TODO: emit error event 1486 service = btstack_memory_l2cap_service_get(); 1487 if (!service) { 1488 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1489 return BTSTACK_MEMORY_ALLOC_FAILED; 1490 } 1491 1492 // fill in 1493 service->psm = psm; 1494 service->mtu = mtu; 1495 service->packet_handler = service_packet_handler; 1496 service->required_security_level = security_level; 1497 1498 // add to services list 1499 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1500 1501 // enable page scan 1502 hci_connectable_control(1); 1503 1504 return 0; 1505 } 1506 1507 void l2cap_unregister_service(uint16_t psm){ 1508 1509 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1510 1511 l2cap_service_t *service = l2cap_get_service(psm); 1512 if (!service) return; 1513 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1514 btstack_memory_l2cap_service_free(service); 1515 1516 // disable page scan when no services registered 1517 if (!btstack_linked_list_empty(&l2cap_services)) return; 1518 hci_connectable_control(0); 1519 } 1520 1521 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1522 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1523 switch(channel_id){ 1524 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1525 attribute_protocol_packet_handler = the_packet_handler; 1526 break; 1527 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1528 security_protocol_packet_handler = the_packet_handler; 1529 break; 1530 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1531 connectionless_channel_packet_handler = the_packet_handler; 1532 break; 1533 } 1534 } 1535 1536 #ifdef ENABLE_BLE 1537 1538 1539 #if 0 1540 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1541 return l2cap_get_service_internal(&l2cap_le_services, psm); 1542 } 1543 /** 1544 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1545 * @param 1546 */ 1547 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1548 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1549 1550 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1551 1552 // check for alread registered psm 1553 // TODO: emit error event 1554 l2cap_service_t *service = l2cap_le_get_service(psm); 1555 if (service) { 1556 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1557 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1558 return; 1559 } 1560 1561 // alloc structure 1562 // TODO: emit error event 1563 service = btstack_memory_l2cap_service_get(); 1564 if (!service) { 1565 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1566 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1567 return; 1568 } 1569 1570 // fill in 1571 service->psm = psm; 1572 service->mtu = mtu; 1573 service->mps = mps; 1574 service->packet_handler = packet_handler; 1575 service->required_security_level = security_level; 1576 1577 // add to services list 1578 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1579 1580 // done 1581 l2cap_emit_service_registered(connection, 0, psm); 1582 } 1583 1584 void l2cap_le_unregister_service(uint16_t psm) { 1585 1586 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1587 1588 l2cap_service_t *service = l2cap_le_get_service(psm); 1589 if (!service) return; 1590 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1591 btstack_memory_l2cap_service_free(service); 1592 } 1593 #endif 1594 #endif 1595