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_linked_list_t l2cap_channels; 77 static btstack_linked_list_t l2cap_services; 78 static btstack_linked_list_t l2cap_le_channels; 79 static btstack_linked_list_t l2cap_le_services; 80 static void (*packet_handler) (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 81 82 static btstack_packet_handler_t attribute_protocol_packet_handler; 83 static btstack_packet_handler_t security_protocol_packet_handler; 84 static btstack_packet_handler_t connectionless_channel_packet_handler; 85 static uint8_t require_security_level2_for_outgoing_sdp; 86 87 // prototypes 88 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 89 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 90 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 91 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 92 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 93 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 94 95 96 void l2cap_init(void){ 97 signaling_responses_pending = 0; 98 99 l2cap_channels = NULL; 100 l2cap_services = NULL; 101 l2cap_le_services = NULL; 102 l2cap_le_channels = NULL; 103 104 packet_handler = null_packet_handler; 105 attribute_protocol_packet_handler = NULL; 106 security_protocol_packet_handler = NULL; 107 connectionless_channel_packet_handler = NULL; 108 109 require_security_level2_for_outgoing_sdp = 0; 110 111 // 112 // register callback with HCI 113 // 114 hci_register_packet_handler(&l2cap_packet_handler); 115 hci_connectable_control(0); // no services yet 116 } 117 118 119 /** Register L2CAP packet handlers */ 120 static void null_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 121 } 122 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 123 packet_handler = handler; 124 } 125 126 // notify client/protocol handler 127 static void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 128 if (channel->packet_handler) { 129 (* (channel->packet_handler))(type, channel->local_cid, data, size); 130 } else { 131 (*packet_handler)(type, channel->local_cid, data, size); 132 } 133 } 134 135 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 136 log_info("L2CAP_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x local_mtu %u, remote_mtu %u, flush_timeout %u", 137 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 138 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 139 uint8_t event[23]; 140 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 141 event[1] = sizeof(event) - 2; 142 event[2] = status; 143 bt_flip_addr(&event[3], channel->address); 144 bt_store_16(event, 9, channel->handle); 145 bt_store_16(event, 11, channel->psm); 146 bt_store_16(event, 13, channel->local_cid); 147 bt_store_16(event, 15, channel->remote_cid); 148 bt_store_16(event, 17, channel->local_mtu); 149 bt_store_16(event, 19, channel->remote_mtu); 150 bt_store_16(event, 21, channel->flush_timeout); 151 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 152 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 153 } 154 155 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 156 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 157 uint8_t event[4]; 158 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 159 event[1] = sizeof(event) - 2; 160 bt_store_16(event, 2, channel->local_cid); 161 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 162 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 163 } 164 165 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 166 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 167 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 168 uint8_t event[16]; 169 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 170 event[1] = sizeof(event) - 2; 171 bt_flip_addr(&event[2], channel->address); 172 bt_store_16(event, 8, channel->handle); 173 bt_store_16(event, 10, channel->psm); 174 bt_store_16(event, 12, channel->local_cid); 175 bt_store_16(event, 14, channel->remote_cid); 176 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 177 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 178 } 179 180 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 181 uint8_t event[6]; 182 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 183 event[1] = 4; 184 bt_store_16(event, 2, handle); 185 bt_store_16(event, 4, result); 186 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 187 (*packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 } 189 190 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 191 btstack_linked_list_iterator_t it; 192 btstack_linked_list_iterator_init(&it, &l2cap_channels); 193 while (btstack_linked_list_iterator_has_next(&it)){ 194 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 195 if ( channel->local_cid == local_cid) { 196 return channel; 197 } 198 } 199 return NULL; 200 } 201 202 int l2cap_can_send_packet_now(uint16_t local_cid){ 203 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 204 if (!channel) return 0; 205 return hci_can_send_acl_packet_now(channel->handle); 206 } 207 208 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 209 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 210 if (!channel) return 0; 211 return hci_can_send_prepared_acl_packet_now(channel->handle); 212 } 213 214 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 215 return hci_can_send_acl_packet_now(handle); 216 } 217 218 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 219 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 220 if (channel) { 221 return channel->remote_mtu; 222 } 223 return 0; 224 } 225 226 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 227 btstack_linked_list_iterator_t it; 228 btstack_linked_list_iterator_init(&it, &l2cap_channels); 229 while (btstack_linked_list_iterator_has_next(&it)){ 230 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 231 if ( &channel->rtx == ts) { 232 return channel; 233 } 234 } 235 return NULL; 236 } 237 238 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 239 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 240 if (!ts) return; 241 242 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 243 244 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 245 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 246 // notify client 247 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 248 249 // discard channel 250 // no need to stop timer here, it is removed from list during timer callback 251 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 252 btstack_memory_l2cap_channel_free(channel); 253 } 254 255 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 256 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 257 btstack_run_loop_remove_timer(&channel->rtx); 258 } 259 260 static void l2cap_start_rtx(l2cap_channel_t * channel){ 261 l2cap_stop_rtx(channel); 262 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 263 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 264 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 265 btstack_run_loop_add_timer(&channel->rtx); 266 } 267 268 static void l2cap_start_ertx(l2cap_channel_t * channel){ 269 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 270 l2cap_stop_rtx(channel); 271 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 272 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 273 btstack_run_loop_add_timer(&channel->rtx); 274 } 275 276 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 277 require_security_level2_for_outgoing_sdp = 1; 278 } 279 280 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 281 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 282 } 283 284 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 285 286 if (!hci_can_send_acl_packet_now(handle)){ 287 log_info("l2cap_send_signaling_packet, cannot send"); 288 return BTSTACK_ACL_BUFFERS_FULL; 289 } 290 291 // log_info("l2cap_send_signaling_packet type %u", cmd); 292 hci_reserve_packet_buffer(); 293 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 294 va_list argptr; 295 va_start(argptr, identifier); 296 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 297 va_end(argptr); 298 // log_info("l2cap_send_signaling_packet con %u!", handle); 299 return hci_send_acl_packet_buffer(len); 300 } 301 302 #ifdef ENABLE_BLE 303 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 304 305 if (!hci_can_send_acl_packet_now(handle)){ 306 log_info("l2cap_send_signaling_packet, cannot send"); 307 return BTSTACK_ACL_BUFFERS_FULL; 308 } 309 310 // log_info("l2cap_send_signaling_packet type %u", cmd); 311 hci_reserve_packet_buffer(); 312 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 313 va_list argptr; 314 va_start(argptr, identifier); 315 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 316 va_end(argptr); 317 // log_info("l2cap_send_signaling_packet con %u!", handle); 318 return hci_send_acl_packet_buffer(len); 319 } 320 #endif 321 322 uint8_t *l2cap_get_outgoing_buffer(void){ 323 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 324 } 325 326 int l2cap_reserve_packet_buffer(void){ 327 return hci_reserve_packet_buffer(); 328 } 329 330 void l2cap_release_packet_buffer(void){ 331 hci_release_packet_buffer(); 332 } 333 334 335 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 336 337 if (!hci_is_packet_buffer_reserved()){ 338 log_error("l2cap_send_prepared called without reserving packet first"); 339 return BTSTACK_ACL_BUFFERS_FULL; 340 } 341 342 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 343 if (!channel) { 344 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 345 return -1; // TODO: define error 346 } 347 348 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 349 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 350 return BTSTACK_ACL_BUFFERS_FULL; 351 } 352 353 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 354 355 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 356 357 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 358 359 // 0 - Connection handle : PB=pb : BC=00 360 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 361 // 2 - ACL length 362 bt_store_16(acl_buffer, 2, len + 4); 363 // 4 - L2CAP packet length 364 bt_store_16(acl_buffer, 4, len + 0); 365 // 6 - L2CAP channel DEST 366 bt_store_16(acl_buffer, 6, channel->remote_cid); 367 // send 368 int err = hci_send_acl_packet_buffer(len+8); 369 370 return err; 371 } 372 373 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 374 375 if (!hci_is_packet_buffer_reserved()){ 376 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 377 return BTSTACK_ACL_BUFFERS_FULL; 378 } 379 380 if (!hci_can_send_prepared_acl_packet_now(handle)){ 381 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 382 return BTSTACK_ACL_BUFFERS_FULL; 383 } 384 385 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 386 387 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 388 389 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 390 391 // 0 - Connection handle : PB=pb : BC=00 392 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 393 // 2 - ACL length 394 bt_store_16(acl_buffer, 2, len + 4); 395 // 4 - L2CAP packet length 396 bt_store_16(acl_buffer, 4, len + 0); 397 // 6 - L2CAP channel DEST 398 bt_store_16(acl_buffer, 6, cid); 399 // send 400 int err = hci_send_acl_packet_buffer(len+8); 401 402 return err; 403 } 404 405 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 406 407 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 408 if (!channel) { 409 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 410 return -1; // TODO: define error 411 } 412 413 if (len > channel->remote_mtu){ 414 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 415 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 416 } 417 418 if (!hci_can_send_acl_packet_now(channel->handle)){ 419 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 420 return BTSTACK_ACL_BUFFERS_FULL; 421 } 422 423 hci_reserve_packet_buffer(); 424 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 425 426 memcpy(&acl_buffer[8], data, len); 427 428 return l2cap_send_prepared(local_cid, len); 429 } 430 431 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 432 433 if (!hci_can_send_acl_packet_now(handle)){ 434 log_info("l2cap_send cid 0x%02x, cannot send", cid); 435 return BTSTACK_ACL_BUFFERS_FULL; 436 } 437 438 hci_reserve_packet_buffer(); 439 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 440 441 memcpy(&acl_buffer[8], data, len); 442 443 return l2cap_send_prepared_connectionless(handle, cid, len); 444 } 445 446 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 447 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 448 } 449 450 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 451 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 452 } 453 454 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 455 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 456 } 457 458 459 460 // MARK: L2CAP_RUN 461 // process outstanding signaling tasks 462 static void l2cap_run(void){ 463 464 // log_info("l2cap_run: entered"); 465 466 // check pending signaling responses 467 while (signaling_responses_pending){ 468 469 hci_con_handle_t handle = signaling_responses[0].handle; 470 471 if (!hci_can_send_acl_packet_now(handle)) break; 472 473 uint8_t sig_id = signaling_responses[0].sig_id; 474 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 475 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 476 uint8_t response_code = signaling_responses[0].code; 477 478 // remove first item before sending (to avoid sending response mutliple times) 479 signaling_responses_pending--; 480 int i; 481 for (i=0; i < signaling_responses_pending; i++){ 482 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 483 } 484 485 switch (response_code){ 486 case CONNECTION_REQUEST: 487 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 488 // also disconnect if result is 0x0003 - security blocked 489 if (result == 0x0003){ 490 hci_disconnect_security_block(handle); 491 } 492 break; 493 case ECHO_REQUEST: 494 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 495 break; 496 case INFORMATION_REQUEST: 497 switch (infoType){ 498 case 1: { // Connectionless MTU 499 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 500 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 501 break; 502 } 503 case 2: { // Extended Features Supported 504 // extended features request supported, features: fixed channels, unicast connectionless data reception 505 uint32_t features = 0x280; 506 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 507 break; 508 } 509 case 3: { // Fixed Channels Supported 510 uint8_t map[8]; 511 memset(map, 0, 8); 512 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 513 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 514 break; 515 } 516 default: 517 // all other types are not supported 518 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 519 break; 520 } 521 break; 522 case COMMAND_REJECT: 523 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 524 #ifdef ENABLE_BLE 525 case COMMAND_REJECT_LE: 526 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 527 break; 528 #endif 529 default: 530 // should not happen 531 break; 532 } 533 } 534 535 uint8_t config_options[4]; 536 btstack_linked_list_iterator_t it; 537 btstack_linked_list_iterator_init(&it, &l2cap_channels); 538 while (btstack_linked_list_iterator_has_next(&it)){ 539 540 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 541 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 542 switch (channel->state){ 543 544 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 545 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 546 if (!hci_can_send_acl_packet_now(channel->handle)) break; 547 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 548 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 549 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 550 } 551 break; 552 553 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 554 if (!hci_can_send_command_packet_now()) break; 555 // send connection request - set state first 556 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 557 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 558 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 559 break; 560 561 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 562 if (!hci_can_send_acl_packet_now(channel->handle)) break; 563 channel->state = L2CAP_STATE_INVALID; 564 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 565 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 566 l2cap_stop_rtx(channel); 567 btstack_linked_list_iterator_remove(&it); 568 btstack_memory_l2cap_channel_free(channel); 569 break; 570 571 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 572 if (!hci_can_send_acl_packet_now(channel->handle)) break; 573 channel->state = L2CAP_STATE_CONFIG; 574 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 575 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 576 break; 577 578 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 579 if (!hci_can_send_acl_packet_now(channel->handle)) break; 580 // success, start l2cap handshake 581 channel->local_sig_id = l2cap_next_sig_id(); 582 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 583 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 584 l2cap_start_rtx(channel); 585 break; 586 587 case L2CAP_STATE_CONFIG: 588 if (!hci_can_send_acl_packet_now(channel->handle)) break; 589 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 590 uint16_t flags = 0; 591 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 592 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 593 flags = 1; 594 } else { 595 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 596 } 597 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 598 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 599 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 600 config_options[0] = 1; // MTU 601 config_options[1] = 2; // len param 602 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 603 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 604 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 605 } else { 606 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 607 } 608 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 609 } 610 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 611 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 612 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 613 channel->local_sig_id = l2cap_next_sig_id(); 614 config_options[0] = 1; // MTU 615 config_options[1] = 2; // len param 616 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 617 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 618 l2cap_start_rtx(channel); 619 } 620 if (l2cap_channel_ready_for_open(channel)){ 621 channel->state = L2CAP_STATE_OPEN; 622 l2cap_emit_channel_opened(channel, 0); // success 623 } 624 break; 625 626 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 627 if (!hci_can_send_acl_packet_now(channel->handle)) break; 628 channel->state = L2CAP_STATE_INVALID; 629 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 630 // 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 :) 631 l2cap_finialize_channel_close(channel); // -- remove from list 632 break; 633 634 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 635 if (!hci_can_send_acl_packet_now(channel->handle)) break; 636 channel->local_sig_id = l2cap_next_sig_id(); 637 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 638 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 639 break; 640 default: 641 break; 642 } 643 } 644 645 #ifdef ENABLE_BLE 646 // send l2cap con paramter update if necessary 647 hci_connections_get_iterator(&it); 648 while(btstack_linked_list_iterator_has_next(&it)){ 649 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 650 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 651 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 652 switch (connection->le_con_parameter_update_state){ 653 case CON_PARAMETER_UPDATE_SEND_REQUEST: 654 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 655 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 656 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 657 break; 658 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 659 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 660 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 661 break; 662 case CON_PARAMETER_UPDATE_DENY: 663 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 664 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 665 break; 666 default: 667 break; 668 } 669 } 670 #endif 671 672 // log_info("l2cap_run: exit"); 673 } 674 675 uint16_t l2cap_max_mtu(void){ 676 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 677 } 678 679 uint16_t l2cap_max_le_mtu(void){ 680 return l2cap_max_mtu(); 681 } 682 683 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 684 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 685 log_info("l2cap_handle_connection_complete expected state"); 686 // success, start l2cap handshake 687 channel->handle = handle; 688 // check remote SSP feature first 689 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 690 } 691 } 692 693 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 694 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 695 696 // we have been waiting for remote supported features, if both support SSP, 697 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)); 698 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 699 // request security level 2 700 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 701 gap_request_security_level(channel->handle, LEVEL_2); 702 return; 703 } 704 // fine, go ahead 705 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 706 } 707 708 /** 709 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 710 * @param packet_handler 711 * @param address 712 * @param psm 713 * @param mtu 714 * @param local_cid 715 */ 716 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){ 717 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 718 719 // alloc structure 720 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 721 if (!chan) { 722 return BTSTACK_MEMORY_ALLOC_FAILED; 723 } 724 725 // Init memory (make valgrind happy) 726 memset(chan, 0, sizeof(l2cap_channel_t)); 727 // limit local mtu to max acl packet length - l2cap header 728 if (mtu > l2cap_max_mtu()) { 729 mtu = l2cap_max_mtu(); 730 } 731 732 // fill in 733 BD_ADDR_COPY(chan->address, address); 734 chan->psm = psm; 735 chan->handle = 0; 736 chan->packet_handler = channel_packet_handler; 737 chan->remote_mtu = L2CAP_MINIMAL_MTU; 738 chan->local_mtu = mtu; 739 chan->local_cid = l2cap_next_local_cid(); 740 741 // set initial state 742 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 743 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 744 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 745 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 746 chan->required_security_level = LEVEL_0; 747 748 // add to connections list 749 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 750 751 // store local_cid 752 if (out_local_cid){ 753 *out_local_cid = chan->local_cid; 754 } 755 756 // check if hci connection is already usable 757 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 758 if (conn){ 759 log_info("l2cap_create_channel, hci connection already exists"); 760 l2cap_handle_connection_complete(conn->con_handle, chan); 761 // check if remote supported fearures are already received 762 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 763 l2cap_handle_remote_supported_features_received(chan); 764 } 765 } 766 767 l2cap_run(); 768 769 return 0; 770 } 771 772 void 773 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 774 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 775 // find channel for local_cid 776 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 777 if (channel) { 778 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 779 } 780 // process 781 l2cap_run(); 782 } 783 784 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 785 btstack_linked_list_iterator_t it; 786 btstack_linked_list_iterator_init(&it, &l2cap_channels); 787 while (btstack_linked_list_iterator_has_next(&it)){ 788 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 789 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 790 // channel for this address found 791 switch (channel->state){ 792 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 793 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 794 // failure, forward error code 795 l2cap_emit_channel_opened(channel, status); 796 // discard channel 797 l2cap_stop_rtx(channel); 798 btstack_linked_list_iterator_remove(&it); 799 btstack_memory_l2cap_channel_free(channel); 800 break; 801 default: 802 break; 803 } 804 } 805 } 806 807 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 808 btstack_linked_list_iterator_t it; 809 btstack_linked_list_iterator_init(&it, &l2cap_channels); 810 while (btstack_linked_list_iterator_has_next(&it)){ 811 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 812 if ( ! BD_ADDR_CMP( channel->address, address) ){ 813 l2cap_handle_connection_complete(handle, channel); 814 } 815 } 816 // process 817 l2cap_run(); 818 } 819 820 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 821 822 bd_addr_t address; 823 hci_con_handle_t handle; 824 btstack_linked_list_iterator_t it; 825 int hci_con_used; 826 827 switch(packet[0]){ 828 829 // handle connection complete events 830 case HCI_EVENT_CONNECTION_COMPLETE: 831 bt_flip_addr(address, &packet[5]); 832 if (packet[2] == 0){ 833 handle = READ_BT_16(packet, 3); 834 l2cap_handle_connection_success_for_addr(address, handle); 835 } else { 836 l2cap_handle_connection_failed_for_addr(address, packet[2]); 837 } 838 break; 839 840 // handle successful create connection cancel command 841 case HCI_EVENT_COMMAND_COMPLETE: 842 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 843 if (packet[5] == 0){ 844 bt_flip_addr(address, &packet[6]); 845 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 846 l2cap_handle_connection_failed_for_addr(address, 0x16); 847 } 848 } 849 l2cap_run(); // try sending signaling packets first 850 break; 851 852 case HCI_EVENT_COMMAND_STATUS: 853 l2cap_run(); // try sending signaling packets first 854 break; 855 856 // handle disconnection complete events 857 case HCI_EVENT_DISCONNECTION_COMPLETE: 858 // send l2cap disconnect events for all channels on this handle and free them 859 handle = READ_BT_16(packet, 3); 860 btstack_linked_list_iterator_init(&it, &l2cap_channels); 861 while (btstack_linked_list_iterator_has_next(&it)){ 862 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 863 if (channel->handle != handle) continue; 864 l2cap_emit_channel_closed(channel); 865 l2cap_stop_rtx(channel); 866 btstack_linked_list_iterator_remove(&it); 867 btstack_memory_l2cap_channel_free(channel); 868 } 869 break; 870 871 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 872 l2cap_run(); // try sending signaling packets first 873 break; 874 875 // HCI Connection Timeouts 876 case L2CAP_EVENT_TIMEOUT_CHECK: 877 handle = READ_BT_16(packet, 2); 878 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 879 if (hci_authentication_active_for_handle(handle)) break; 880 hci_con_used = 0; 881 btstack_linked_list_iterator_init(&it, &l2cap_channels); 882 while (btstack_linked_list_iterator_has_next(&it)){ 883 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 884 if (channel->handle != handle) continue; 885 hci_con_used = 1; 886 break; 887 } 888 if (hci_con_used) break; 889 if (!hci_can_send_command_packet_now()) break; 890 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 891 break; 892 893 case DAEMON_EVENT_HCI_PACKET_SENT: 894 l2cap_run(); // try sending signaling packets first 895 896 btstack_linked_list_iterator_init(&it, &l2cap_channels); 897 while (btstack_linked_list_iterator_has_next(&it)){ 898 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 899 if (!channel->packet_handler) continue; 900 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 901 } 902 if (attribute_protocol_packet_handler) { 903 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 904 } 905 if (security_protocol_packet_handler) { 906 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 907 } 908 if (connectionless_channel_packet_handler) { 909 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 910 } 911 break; 912 913 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 914 handle = READ_BT_16(packet, 3); 915 btstack_linked_list_iterator_init(&it, &l2cap_channels); 916 while (btstack_linked_list_iterator_has_next(&it)){ 917 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 918 if (channel->handle != handle) continue; 919 l2cap_handle_remote_supported_features_received(channel); 920 break; 921 } 922 break; 923 924 case GAP_EVENT_SECURITY_LEVEL: 925 handle = READ_BT_16(packet, 2); 926 log_info("l2cap - security level update"); 927 btstack_linked_list_iterator_init(&it, &l2cap_channels); 928 while (btstack_linked_list_iterator_has_next(&it)){ 929 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 930 if (channel->handle != handle) continue; 931 932 log_info("l2cap - state %u", channel->state); 933 934 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 935 gap_security_level_t required_level = channel->required_security_level; 936 937 switch (channel->state){ 938 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 939 if (actual_level >= required_level){ 940 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 941 l2cap_emit_connection_request(channel); 942 } else { 943 channel->reason = 0x0003; // security block 944 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 945 } 946 break; 947 948 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 949 if (actual_level >= required_level){ 950 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 951 } else { 952 // disconnnect, authentication not good enough 953 hci_disconnect_security_block(handle); 954 } 955 break; 956 957 default: 958 break; 959 } 960 } 961 break; 962 963 default: 964 break; 965 } 966 967 // pass on: main packet handler, att and sm packet handlers 968 (*packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 969 if (attribute_protocol_packet_handler){ 970 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 971 } 972 if (security_protocol_packet_handler) { 973 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 974 } 975 if (connectionless_channel_packet_handler) { 976 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 977 } 978 979 l2cap_run(); 980 } 981 982 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 983 channel->remote_sig_id = identifier; 984 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 985 l2cap_run(); 986 } 987 988 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 989 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 990 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 991 signaling_responses[signaling_responses_pending].handle = handle; 992 signaling_responses[signaling_responses_pending].code = code; 993 signaling_responses[signaling_responses_pending].sig_id = sig_id; 994 signaling_responses[signaling_responses_pending].data = data; 995 signaling_responses_pending++; 996 l2cap_run(); 997 } 998 } 999 1000 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1001 1002 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1003 l2cap_service_t *service = l2cap_get_service(psm); 1004 if (!service) { 1005 // 0x0002 PSM not supported 1006 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1007 return; 1008 } 1009 1010 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1011 if (!hci_connection) { 1012 // 1013 log_error("no hci_connection for handle %u", handle); 1014 return; 1015 } 1016 1017 // alloc structure 1018 // log_info("l2cap_handle_connection_request register channel"); 1019 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1020 if (!channel){ 1021 // 0x0004 No resources available 1022 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1023 return; 1024 } 1025 // Init memory (make valgrind happy) 1026 memset(channel, 0, sizeof(l2cap_channel_t)); 1027 // fill in 1028 BD_ADDR_COPY(channel->address, hci_connection->address); 1029 channel->psm = psm; 1030 channel->handle = handle; 1031 channel->packet_handler = service->packet_handler; 1032 channel->local_cid = l2cap_next_local_cid(); 1033 channel->remote_cid = source_cid; 1034 channel->local_mtu = service->mtu; 1035 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1036 channel->remote_sig_id = sig_id; 1037 channel->required_security_level = service->required_security_level; 1038 1039 // limit local mtu to max acl packet length - l2cap header 1040 if (channel->local_mtu > l2cap_max_mtu()) { 1041 channel->local_mtu = l2cap_max_mtu(); 1042 } 1043 1044 // set initial state 1045 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1046 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1047 1048 // add to connections list 1049 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1050 1051 // assert security requirements 1052 gap_request_security_level(handle, channel->required_security_level); 1053 } 1054 1055 void l2cap_accept_connection(uint16_t local_cid){ 1056 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1057 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1058 if (!channel) { 1059 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1060 return; 1061 } 1062 1063 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1064 1065 // process 1066 l2cap_run(); 1067 } 1068 1069 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1070 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1071 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1072 if (!channel) { 1073 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1074 return; 1075 } 1076 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1077 channel->reason = reason; 1078 l2cap_run(); 1079 } 1080 1081 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1082 1083 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1084 1085 uint16_t flags = READ_BT_16(command, 6); 1086 if (flags & 1) { 1087 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1088 } 1089 1090 // accept the other's configuration options 1091 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1092 uint16_t pos = 8; 1093 while (pos < end_pos){ 1094 uint8_t option_hint = command[pos] >> 7; 1095 uint8_t option_type = command[pos] & 0x7f; 1096 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1097 pos++; 1098 uint8_t length = command[pos++]; 1099 // MTU { type(8): 1, len(8):2, MTU(16) } 1100 if (option_type == 1 && length == 2){ 1101 channel->remote_mtu = READ_BT_16(command, pos); 1102 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1103 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1104 } 1105 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1106 if (option_type == 2 && length == 2){ 1107 channel->flush_timeout = READ_BT_16(command, pos); 1108 } 1109 // check for unknown options 1110 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1111 log_info("l2cap cid %u, unknown options", channel->local_cid); 1112 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1113 } 1114 pos += length; 1115 } 1116 } 1117 1118 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1119 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1120 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1121 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1122 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1123 if (channel->state == L2CAP_STATE_OPEN) return 0; 1124 return 1; 1125 } 1126 1127 1128 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1129 1130 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1131 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1132 uint16_t result = 0; 1133 1134 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1135 1136 // handle DISCONNECT REQUESTS seperately 1137 if (code == DISCONNECTION_REQUEST){ 1138 switch (channel->state){ 1139 case L2CAP_STATE_CONFIG: 1140 case L2CAP_STATE_OPEN: 1141 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1142 case L2CAP_STATE_WAIT_DISCONNECT: 1143 l2cap_handle_disconnect_request(channel, identifier); 1144 break; 1145 1146 default: 1147 // ignore in other states 1148 break; 1149 } 1150 return; 1151 } 1152 1153 // @STATEMACHINE(l2cap) 1154 switch (channel->state) { 1155 1156 case L2CAP_STATE_WAIT_CONNECT_RSP: 1157 switch (code){ 1158 case CONNECTION_RESPONSE: 1159 l2cap_stop_rtx(channel); 1160 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1161 switch (result) { 1162 case 0: 1163 // successful connection 1164 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1165 channel->state = L2CAP_STATE_CONFIG; 1166 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1167 break; 1168 case 1: 1169 // connection pending. get some coffee, but start the ERTX 1170 l2cap_start_ertx(channel); 1171 break; 1172 default: 1173 // channel closed 1174 channel->state = L2CAP_STATE_CLOSED; 1175 // map l2cap connection response result to BTstack status enumeration 1176 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1177 1178 // drop link key if security block 1179 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1180 hci_drop_link_key_for_bd_addr(channel->address); 1181 } 1182 1183 // discard channel 1184 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1185 btstack_memory_l2cap_channel_free(channel); 1186 break; 1187 } 1188 break; 1189 1190 default: 1191 //@TODO: implement other signaling packets 1192 break; 1193 } 1194 break; 1195 1196 case L2CAP_STATE_CONFIG: 1197 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1198 switch (code) { 1199 case CONFIGURE_REQUEST: 1200 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1201 l2cap_signaling_handle_configure_request(channel, command); 1202 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1203 // only done if continuation not set 1204 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1205 } 1206 break; 1207 case CONFIGURE_RESPONSE: 1208 l2cap_stop_rtx(channel); 1209 switch (result){ 1210 case 0: // success 1211 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1212 break; 1213 case 4: // pending 1214 l2cap_start_ertx(channel); 1215 break; 1216 default: 1217 // retry on negative result 1218 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1219 break; 1220 } 1221 break; 1222 default: 1223 break; 1224 } 1225 if (l2cap_channel_ready_for_open(channel)){ 1226 // for open: 1227 channel->state = L2CAP_STATE_OPEN; 1228 l2cap_emit_channel_opened(channel, 0); 1229 } 1230 break; 1231 1232 case L2CAP_STATE_WAIT_DISCONNECT: 1233 switch (code) { 1234 case DISCONNECTION_RESPONSE: 1235 l2cap_finialize_channel_close(channel); 1236 break; 1237 default: 1238 //@TODO: implement other signaling packets 1239 break; 1240 } 1241 break; 1242 1243 case L2CAP_STATE_CLOSED: 1244 // @TODO handle incoming requests 1245 break; 1246 1247 case L2CAP_STATE_OPEN: 1248 //@TODO: implement other signaling packets, e.g. re-configure 1249 break; 1250 default: 1251 break; 1252 } 1253 // log_info("new state %u", channel->state); 1254 } 1255 1256 1257 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1258 1259 // get code, signalind identifier and command len 1260 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1261 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1262 1263 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1264 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1265 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1266 return; 1267 } 1268 1269 // general commands without an assigned channel 1270 switch(code) { 1271 1272 case CONNECTION_REQUEST: { 1273 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1274 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1275 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1276 return; 1277 } 1278 1279 case ECHO_REQUEST: 1280 l2cap_register_signaling_response(handle, code, sig_id, 0); 1281 return; 1282 1283 case INFORMATION_REQUEST: { 1284 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1285 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1286 return; 1287 } 1288 1289 default: 1290 break; 1291 } 1292 1293 1294 // Get potential destination CID 1295 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1296 1297 // Find channel for this sig_id and connection handle 1298 btstack_linked_list_iterator_t it; 1299 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1300 while (btstack_linked_list_iterator_has_next(&it)){ 1301 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1302 if (channel->handle != handle) continue; 1303 if (code & 1) { 1304 // match odd commands (responses) by previous signaling identifier 1305 if (channel->local_sig_id == sig_id) { 1306 l2cap_signaling_handler_channel(channel, command); 1307 break; 1308 } 1309 } else { 1310 // match even commands (requests) by local channel id 1311 if (channel->local_cid == dest_cid) { 1312 l2cap_signaling_handler_channel(channel, command); 1313 break; 1314 } 1315 } 1316 } 1317 } 1318 1319 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1320 1321 // Get Channel ID 1322 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1323 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1324 1325 switch (channel_id) { 1326 1327 case L2CAP_CID_SIGNALING: { 1328 1329 uint16_t command_offset = 8; 1330 while (command_offset < size) { 1331 1332 // handle signaling commands 1333 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1334 1335 // increment command_offset 1336 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1337 } 1338 break; 1339 } 1340 1341 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1342 if (attribute_protocol_packet_handler) { 1343 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1344 } 1345 break; 1346 1347 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1348 if (security_protocol_packet_handler) { 1349 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1350 } 1351 break; 1352 1353 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1354 if (connectionless_channel_packet_handler) { 1355 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1356 } 1357 break; 1358 1359 case L2CAP_CID_SIGNALING_LE: { 1360 switch (packet[8]){ 1361 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1362 uint16_t result = READ_BT_16(packet, 12); 1363 l2cap_emit_connection_parameter_update_response(handle, result); 1364 break; 1365 } 1366 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1367 uint8_t event[10]; 1368 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1369 event[1] = 8; 1370 memcpy(&event[2], &packet[12], 8); 1371 1372 hci_connection_t * connection = hci_connection_for_handle(handle); 1373 if (connection){ 1374 if (connection->role != HCI_ROLE_MASTER){ 1375 // reject command without notifying upper layer when not in master role 1376 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1377 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1378 break; 1379 } 1380 int update_parameter = 1; 1381 le_connection_parameter_range_t existing_range; 1382 gap_le_get_connection_parameter_range(existing_range); 1383 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1384 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1385 uint16_t le_conn_latency = READ_BT_16(packet,16); 1386 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1387 1388 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1389 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1390 1391 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1392 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1393 1394 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1395 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1396 1397 if (update_parameter){ 1398 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1399 connection->le_conn_interval_min = le_conn_interval_min; 1400 connection->le_conn_interval_max = le_conn_interval_max; 1401 connection->le_conn_latency = le_conn_latency; 1402 connection->le_supervision_timeout = le_supervision_timeout; 1403 } else { 1404 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1405 } 1406 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1407 } 1408 1409 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1410 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1411 1412 break; 1413 } 1414 default: { 1415 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1416 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1417 break; 1418 } 1419 } 1420 break; 1421 } 1422 1423 default: { 1424 // Find channel for this channel_id and connection handle 1425 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1426 if (channel) { 1427 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1428 } 1429 break; 1430 } 1431 } 1432 } 1433 1434 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1435 switch (packet_type) { 1436 case HCI_EVENT_PACKET: 1437 l2cap_event_handler(packet, size); 1438 break; 1439 case HCI_ACL_DATA_PACKET: 1440 l2cap_acl_handler(packet, size); 1441 break; 1442 default: 1443 break; 1444 } 1445 l2cap_run(); 1446 } 1447 1448 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1449 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1450 channel->state = L2CAP_STATE_CLOSED; 1451 l2cap_emit_channel_closed(channel); 1452 // discard channel 1453 l2cap_stop_rtx(channel); 1454 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1455 btstack_memory_l2cap_channel_free(channel); 1456 } 1457 1458 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1459 btstack_linked_list_iterator_t it; 1460 btstack_linked_list_iterator_init(&it, services); 1461 while (btstack_linked_list_iterator_has_next(&it)){ 1462 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1463 if ( service->psm == psm){ 1464 return service; 1465 }; 1466 } 1467 return NULL; 1468 } 1469 1470 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1471 return l2cap_get_service_internal(&l2cap_services, psm); 1472 } 1473 1474 1475 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1476 1477 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1478 1479 // check for alread registered psm 1480 // TODO: emit error event 1481 l2cap_service_t *service = l2cap_get_service(psm); 1482 if (service) { 1483 log_error("l2cap_register_service: PSM %u already registered", psm); 1484 return L2CAP_SERVICE_ALREADY_REGISTERED; 1485 } 1486 1487 // alloc structure 1488 // TODO: emit error event 1489 service = btstack_memory_l2cap_service_get(); 1490 if (!service) { 1491 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1492 return BTSTACK_MEMORY_ALLOC_FAILED; 1493 } 1494 1495 // fill in 1496 service->psm = psm; 1497 service->mtu = mtu; 1498 service->packet_handler = service_packet_handler; 1499 service->required_security_level = security_level; 1500 1501 // add to services list 1502 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1503 1504 // enable page scan 1505 hci_connectable_control(1); 1506 1507 return 0; 1508 } 1509 1510 void l2cap_unregister_service(uint16_t psm){ 1511 1512 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1513 1514 l2cap_service_t *service = l2cap_get_service(psm); 1515 if (!service) return; 1516 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1517 btstack_memory_l2cap_service_free(service); 1518 1519 // disable page scan when no services registered 1520 if (!btstack_linked_list_empty(&l2cap_services)) return; 1521 hci_connectable_control(0); 1522 } 1523 1524 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1525 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1526 switch(channel_id){ 1527 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1528 attribute_protocol_packet_handler = the_packet_handler; 1529 break; 1530 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1531 security_protocol_packet_handler = the_packet_handler; 1532 break; 1533 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1534 connectionless_channel_packet_handler = the_packet_handler; 1535 break; 1536 } 1537 } 1538 1539 #ifdef ENABLE_BLE 1540 1541 1542 #if 0 1543 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1544 return l2cap_get_service_internal(&l2cap_le_services, psm); 1545 } 1546 /** 1547 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1548 * @param 1549 */ 1550 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1551 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1552 1553 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1554 1555 // check for alread registered psm 1556 // TODO: emit error event 1557 l2cap_service_t *service = l2cap_le_get_service(psm); 1558 if (service) { 1559 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1560 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1561 return; 1562 } 1563 1564 // alloc structure 1565 // TODO: emit error event 1566 service = btstack_memory_l2cap_service_get(); 1567 if (!service) { 1568 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1569 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1570 return; 1571 } 1572 1573 // fill in 1574 service->psm = psm; 1575 service->mtu = mtu; 1576 service->mps = mps; 1577 service->packet_handler = packet_handler; 1578 service->required_security_level = security_level; 1579 1580 // add to services list 1581 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1582 1583 // done 1584 l2cap_emit_service_registered(connection, 0, psm); 1585 } 1586 1587 void l2cap_le_unregister_service(uint16_t psm) { 1588 1589 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1590 1591 l2cap_service_t *service = l2cap_le_get_service(psm); 1592 if (!service) return; 1593 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1594 btstack_memory_l2cap_service_free(service); 1595 } 1596 #endif 1597 #endif 1598