1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * l2cap.c 40 * 41 * Logical Link Control and Adaption Protocl (L2CAP) 42 * 43 * Created by Matthias Ringwald on 5/16/09. 44 */ 45 46 #include "l2cap.h" 47 #include "hci.h" 48 #include "hci_dump.h" 49 #include "debug.h" 50 #include "btstack_memory.h" 51 52 #include <stdarg.h> 53 #include <string.h> 54 55 #include <stdio.h> 56 57 // nr of buffered acl packets in outgoing queue to get max performance 58 #define NR_BUFFERED_ACL_PACKETS 3 59 60 // used to cache l2cap rejects, echo, and informational requests 61 #define NR_PENDING_SIGNALING_RESPONSES 3 62 63 // offsets for L2CAP SIGNALING COMMANDS 64 #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 65 #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 66 #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 67 #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 68 69 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 70 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 71 72 // used to cache l2cap rejects, echo, and informational requests 73 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 74 static int signaling_responses_pending; 75 76 static linked_list_t l2cap_channels; 77 static linked_list_t l2cap_services; 78 static void (*packet_handler) (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 79 static int new_credits_blocked = 0; 80 81 static btstack_packet_handler_t attribute_protocol_packet_handler; 82 static btstack_packet_handler_t security_protocol_packet_handler; 83 static btstack_packet_handler_t connectionless_channel_packet_handler; 84 static uint8_t require_security_level2_for_outgoing_sdp; 85 86 // prototypes 87 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 88 static l2cap_service_t * l2cap_get_service(uint16_t psm); 89 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 90 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 91 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 92 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 93 94 95 void l2cap_init(){ 96 new_credits_blocked = 0; 97 signaling_responses_pending = 0; 98 99 l2cap_channels = NULL; 100 l2cap_services = NULL; 101 102 packet_handler = null_packet_handler; 103 attribute_protocol_packet_handler = NULL; 104 security_protocol_packet_handler = NULL; 105 connectionless_channel_packet_handler = NULL; 106 107 require_security_level2_for_outgoing_sdp = 0; 108 109 // 110 // register callback with HCI 111 // 112 hci_register_packet_handler(&l2cap_packet_handler); 113 hci_connectable_control(0); // no services yet 114 } 115 116 117 /** Register L2CAP packet handlers */ 118 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 119 } 120 void l2cap_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 121 packet_handler = handler; 122 } 123 124 // notify client/protocol handler 125 void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 126 if (channel->packet_handler) { 127 (* (channel->packet_handler))(type, channel->local_cid, data, size); 128 } else { 129 (*packet_handler)(channel->connection, type, channel->local_cid, data, size); 130 } 131 } 132 133 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 134 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", 135 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 136 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 137 uint8_t event[23]; 138 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 139 event[1] = sizeof(event) - 2; 140 event[2] = status; 141 bt_flip_addr(&event[3], channel->address); 142 bt_store_16(event, 9, channel->handle); 143 bt_store_16(event, 11, channel->psm); 144 bt_store_16(event, 13, channel->local_cid); 145 bt_store_16(event, 15, channel->remote_cid); 146 bt_store_16(event, 17, channel->local_mtu); 147 bt_store_16(event, 19, channel->remote_mtu); 148 bt_store_16(event, 21, channel->flush_timeout); 149 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 150 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 151 } 152 153 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 154 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 155 uint8_t event[4]; 156 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 157 event[1] = sizeof(event) - 2; 158 bt_store_16(event, 2, channel->local_cid); 159 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 160 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 161 } 162 163 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 164 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 165 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 166 uint8_t event[16]; 167 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 168 event[1] = sizeof(event) - 2; 169 bt_flip_addr(&event[2], channel->address); 170 bt_store_16(event, 8, channel->handle); 171 bt_store_16(event, 10, channel->psm); 172 bt_store_16(event, 12, channel->local_cid); 173 bt_store_16(event, 14, channel->remote_cid); 174 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 175 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 176 } 177 178 void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 179 uint8_t event[6]; 180 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 181 event[1] = 4; 182 bt_store_16(event, 2, handle); 183 bt_store_16(event, 4, result); 184 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 185 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 186 } 187 188 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 189 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 190 uint8_t event[5]; 191 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 192 event[1] = sizeof(event) - 2; 193 event[2] = status; 194 bt_store_16(event, 3, psm); 195 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 196 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 197 } 198 199 void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 200 201 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 202 // track credits 203 channel->packets_granted += credits; 204 205 uint8_t event[5]; 206 event[0] = L2CAP_EVENT_CREDITS; 207 event[1] = sizeof(event) - 2; 208 bt_store_16(event, 2, channel->local_cid); 209 event[4] = credits; 210 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 211 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 212 } 213 214 void l2cap_block_new_credits(uint8_t blocked){ 215 new_credits_blocked = blocked; 216 } 217 218 void l2cap_hand_out_credits(void){ 219 220 if (new_credits_blocked) return; // we're told not to. used by daemon 221 222 linked_list_iterator_t it; 223 linked_list_iterator_init(&it, &l2cap_channels); 224 while (linked_list_iterator_has_next(&it)){ 225 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 226 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 227 if (channel->state != L2CAP_STATE_OPEN) continue; 228 if (hci_number_outgoing_packets(channel->handle) < NR_BUFFERED_ACL_PACKETS && channel->packets_granted == 0) { 229 l2cap_emit_credits(channel, 1); 230 } 231 } 232 } 233 234 l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 235 linked_list_iterator_t it; 236 linked_list_iterator_init(&it, &l2cap_channels); 237 while (linked_list_iterator_has_next(&it)){ 238 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 239 if ( channel->local_cid == local_cid) { 240 return channel; 241 } 242 } 243 return NULL; 244 } 245 246 int l2cap_can_send_packet_now(uint16_t local_cid){ 247 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 248 if (!channel) return 0; 249 if (!channel->packets_granted) return 0; 250 return hci_can_send_acl_packet_now(channel->handle); 251 } 252 253 // @deprecated 254 int l2cap_can_send_connectionless_packet_now(void){ 255 // TODO provide real handle 256 return l2cap_can_send_fixed_channel_packet_now(0x1234); 257 } 258 259 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 260 return hci_can_send_acl_packet_now(handle); 261 } 262 263 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 264 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 265 if (channel) { 266 return channel->remote_mtu; 267 } 268 return 0; 269 } 270 271 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 272 linked_list_iterator_t it; 273 linked_list_iterator_init(&it, &l2cap_channels); 274 while (linked_list_iterator_has_next(&it)){ 275 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 276 if ( &channel->rtx == ts) { 277 return channel; 278 } 279 } 280 return NULL; 281 } 282 283 static void l2cap_rtx_timeout(timer_source_t * ts){ 284 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 285 if (!ts) return; 286 287 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 288 289 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 290 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 291 // notify client 292 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 293 294 // discard channel 295 // no need to stop timer here, it is removed from list during timer callback 296 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 297 btstack_memory_l2cap_channel_free(channel); 298 } 299 300 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 301 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 302 run_loop_remove_timer(&channel->rtx); 303 } 304 305 static void l2cap_start_rtx(l2cap_channel_t * channel){ 306 l2cap_stop_rtx(channel); 307 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 308 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 309 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 310 run_loop_add_timer(&channel->rtx); 311 } 312 313 static void l2cap_start_ertx(l2cap_channel_t * channel){ 314 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 315 l2cap_stop_rtx(channel); 316 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 317 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 318 run_loop_add_timer(&channel->rtx); 319 } 320 321 void l2cap_require_security_level_2_for_outgoing_sdp(){ 322 require_security_level2_for_outgoing_sdp = 1; 323 } 324 325 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 326 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 327 } 328 329 int l2cap_send_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_classic(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 } 346 347 #ifdef HAVE_BLE 348 int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 349 350 if (!hci_can_send_acl_packet_now(handle)){ 351 log_info("l2cap_send_signaling_packet, cannot send"); 352 return BTSTACK_ACL_BUFFERS_FULL; 353 } 354 355 // log_info("l2cap_send_signaling_packet type %u", cmd); 356 hci_reserve_packet_buffer(); 357 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 358 va_list argptr; 359 va_start(argptr, identifier); 360 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 361 va_end(argptr); 362 // log_info("l2cap_send_signaling_packet con %u!", handle); 363 return hci_send_acl_packet_buffer(len); 364 } 365 #endif 366 367 uint8_t *l2cap_get_outgoing_buffer(void){ 368 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 369 } 370 371 int l2cap_reserve_packet_buffer(void){ 372 return hci_reserve_packet_buffer(); 373 } 374 375 void l2cap_release_packet_buffer(void){ 376 hci_release_packet_buffer(); 377 } 378 379 380 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 381 382 if (!hci_is_packet_buffer_reserved()){ 383 log_error("l2cap_send_prepared called without reserving packet first"); 384 return BTSTACK_ACL_BUFFERS_FULL; 385 } 386 387 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 388 if (!channel) { 389 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 390 return -1; // TODO: define error 391 } 392 393 if (channel->packets_granted == 0){ 394 log_error("l2cap_send_prepared cid 0x%02x, no credits!", local_cid); 395 return -1; // TODO: define error 396 } 397 398 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 399 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 400 return BTSTACK_ACL_BUFFERS_FULL; 401 } 402 403 --channel->packets_granted; 404 405 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used, credits left %u;", 406 local_cid, channel->handle, channel->packets_granted); 407 408 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 409 410 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 411 412 // 0 - Connection handle : PB=pb : BC=00 413 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 414 // 2 - ACL length 415 bt_store_16(acl_buffer, 2, len + 4); 416 // 4 - L2CAP packet length 417 bt_store_16(acl_buffer, 4, len + 0); 418 // 6 - L2CAP channel DEST 419 bt_store_16(acl_buffer, 6, channel->remote_cid); 420 // send 421 int err = hci_send_acl_packet_buffer(len+8); 422 423 l2cap_hand_out_credits(); 424 425 return err; 426 } 427 428 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 429 430 if (!hci_is_packet_buffer_reserved()){ 431 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 432 return BTSTACK_ACL_BUFFERS_FULL; 433 } 434 435 if (!hci_can_send_prepared_acl_packet_now(handle)){ 436 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 437 return BTSTACK_ACL_BUFFERS_FULL; 438 } 439 440 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 441 442 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 443 444 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 445 446 // 0 - Connection handle : PB=pb : BC=00 447 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 448 // 2 - ACL length 449 bt_store_16(acl_buffer, 2, len + 4); 450 // 4 - L2CAP packet length 451 bt_store_16(acl_buffer, 4, len + 0); 452 // 6 - L2CAP channel DEST 453 bt_store_16(acl_buffer, 6, cid); 454 // send 455 int err = hci_send_acl_packet_buffer(len+8); 456 457 l2cap_hand_out_credits(); 458 459 return err; 460 } 461 462 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 463 464 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 465 if (!channel) { 466 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 467 return -1; // TODO: define error 468 } 469 470 if (len > channel->remote_mtu){ 471 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 472 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 473 } 474 475 if (!hci_can_send_acl_packet_now(channel->handle)){ 476 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 477 return BTSTACK_ACL_BUFFERS_FULL; 478 } 479 480 hci_reserve_packet_buffer(); 481 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 482 483 memcpy(&acl_buffer[8], data, len); 484 485 return l2cap_send_prepared(local_cid, len); 486 } 487 488 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 489 490 if (!hci_can_send_acl_packet_now(handle)){ 491 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 492 return BTSTACK_ACL_BUFFERS_FULL; 493 } 494 495 hci_reserve_packet_buffer(); 496 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 497 498 memcpy(&acl_buffer[8], data, len); 499 500 return l2cap_send_prepared_connectionless(handle, cid, len); 501 } 502 503 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 504 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 505 } 506 507 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 508 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 509 } 510 511 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 512 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 513 } 514 515 516 517 // MARK: L2CAP_RUN 518 // process outstanding signaling tasks 519 void l2cap_run(void){ 520 521 // check pending signaling responses 522 while (signaling_responses_pending){ 523 524 hci_con_handle_t handle = signaling_responses[0].handle; 525 526 if (!hci_can_send_acl_packet_now(handle)) break; 527 528 uint8_t sig_id = signaling_responses[0].sig_id; 529 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 530 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 531 uint8_t response_code = signaling_responses[0].code; 532 533 // remove first item before sending (to avoid sending response mutliple times) 534 signaling_responses_pending--; 535 int i; 536 for (i=0; i < signaling_responses_pending; i++){ 537 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 538 } 539 540 switch (response_code){ 541 case CONNECTION_REQUEST: 542 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 543 // also disconnect if result is 0x0003 - security blocked 544 if (result == 0x0003){ 545 hci_disconnect_security_block(handle); 546 } 547 break; 548 case ECHO_REQUEST: 549 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 550 break; 551 case INFORMATION_REQUEST: 552 switch (infoType){ 553 case 1: { // Connectionless MTU 554 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 555 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 556 break; 557 } 558 case 2: { // Extended Features Supported 559 // extended features request supported, features: fixed channels, unicast connectionless data reception 560 uint32_t features = 0x280; 561 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 562 break; 563 } 564 case 3: { // Fixed Channels Supported 565 uint8_t map[8]; 566 memset(map, 0, 8); 567 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 568 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 569 break; 570 } 571 default: 572 // all other types are not supported 573 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 574 break; 575 } 576 break; 577 case COMMAND_REJECT: 578 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 579 #ifdef HAVE_BLE 580 case COMMAND_REJECT_LE: 581 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 582 break; 583 #endif 584 default: 585 // should not happen 586 break; 587 } 588 } 589 590 uint8_t config_options[4]; 591 linked_list_iterator_t it; 592 linked_list_iterator_init(&it, &l2cap_channels); 593 while (linked_list_iterator_has_next(&it)){ 594 595 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 596 // log_info("l2cap_run: state %u, var 0x%02x", channel->state, channel->state_var); 597 switch (channel->state){ 598 599 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 600 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 601 if (!hci_can_send_acl_packet_now(channel->handle)) break; 602 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 603 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 604 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 605 } 606 break; 607 608 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 609 if (!hci_can_send_command_packet_now()) break; 610 // send connection request - set state first 611 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 612 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 613 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 614 break; 615 616 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 617 if (!hci_can_send_acl_packet_now(channel->handle)) break; 618 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 619 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 620 l2cap_stop_rtx(channel); 621 linked_list_iterator_remove(&it); 622 btstack_memory_l2cap_channel_free(channel); 623 break; 624 625 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 626 if (!hci_can_send_acl_packet_now(channel->handle)) break; 627 channel->state = L2CAP_STATE_CONFIG; 628 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 629 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 630 break; 631 632 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 633 if (!hci_can_send_acl_packet_now(channel->handle)) break; 634 // success, start l2cap handshake 635 channel->local_sig_id = l2cap_next_sig_id(); 636 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 637 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 638 l2cap_start_rtx(channel); 639 break; 640 641 case L2CAP_STATE_CONFIG: 642 if (!hci_can_send_acl_packet_now(channel->handle)) break; 643 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 644 uint16_t flags = 0; 645 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 646 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 647 flags = 1; 648 } else { 649 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 650 } 651 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 652 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 653 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 654 config_options[0] = 1; // MTU 655 config_options[1] = 2; // len param 656 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 657 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 658 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 659 } else { 660 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 661 } 662 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 663 } 664 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 665 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 666 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 667 channel->local_sig_id = l2cap_next_sig_id(); 668 config_options[0] = 1; // MTU 669 config_options[1] = 2; // len param 670 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 671 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 672 l2cap_start_rtx(channel); 673 } 674 if (l2cap_channel_ready_for_open(channel)){ 675 channel->state = L2CAP_STATE_OPEN; 676 l2cap_emit_channel_opened(channel, 0); // success 677 l2cap_emit_credits(channel, 1); 678 } 679 break; 680 681 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 682 if (!hci_can_send_acl_packet_now(channel->handle)) break; 683 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 684 // 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 :) 685 l2cap_finialize_channel_close(channel); // -- remove from list 686 break; 687 688 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 689 if (!hci_can_send_acl_packet_now(channel->handle)) break; 690 channel->local_sig_id = l2cap_next_sig_id(); 691 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 692 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 693 break; 694 default: 695 break; 696 } 697 } 698 699 #ifdef HAVE_BLE 700 // send l2cap con paramter update if necessary 701 hci_connections_get_iterator(&it); 702 while(linked_list_iterator_has_next(&it)){ 703 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 704 int result; 705 706 switch (connection->le_con_parameter_update_state){ 707 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 708 result = 0; 709 break; 710 case CON_PARAMETER_UPDATE_DENY: 711 result = 1; 712 break; 713 default: 714 result = -1; 715 break; 716 } 717 if (result < 0) break; 718 719 if (!hci_can_send_acl_packet_now(connection->con_handle)) break; 720 hci_reserve_packet_buffer(); 721 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 722 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 723 uint16_t len = l2cap_le_create_connection_parameter_update_response(acl_buffer, connection->con_handle, 0); 724 hci_send_acl_packet_buffer(len); 725 } 726 #endif 727 728 } 729 730 uint16_t l2cap_max_mtu(void){ 731 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 732 } 733 734 uint16_t l2cap_max_le_mtu(){ 735 return l2cap_max_mtu(); 736 } 737 738 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 739 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 740 log_info("l2cap_handle_connection_complete expected state"); 741 // success, start l2cap handshake 742 channel->handle = handle; 743 channel->local_cid = l2cap_next_local_cid(); 744 // check remote SSP feature first 745 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 746 } 747 } 748 749 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 750 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 751 752 // we have been waiting for remote supported features, if both support SSP, 753 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)); 754 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 755 // request security level 2 756 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 757 gap_request_security_level(channel->handle, LEVEL_2); 758 return; 759 } 760 // fine, go ahead 761 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 762 } 763 764 // open outgoing L2CAP channel 765 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t packet_handler, 766 bd_addr_t address, uint16_t psm, uint16_t mtu){ 767 768 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 769 770 // alloc structure 771 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 772 if (!chan) { 773 // emit error event 774 l2cap_channel_t dummy_channel; 775 BD_ADDR_COPY(dummy_channel.address, address); 776 dummy_channel.psm = psm; 777 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 778 return; 779 } 780 // Init memory (make valgrind happy) 781 memset(chan, 0, sizeof(l2cap_channel_t)); 782 // limit local mtu to max acl packet length - l2cap header 783 if (mtu > l2cap_max_mtu()) { 784 mtu = l2cap_max_mtu(); 785 } 786 787 // fill in 788 BD_ADDR_COPY(chan->address, address); 789 chan->psm = psm; 790 chan->handle = 0; 791 chan->connection = connection; 792 chan->packet_handler = packet_handler; 793 chan->remote_mtu = L2CAP_MINIMAL_MTU; 794 chan->local_mtu = mtu; 795 chan->packets_granted = 0; 796 797 // set initial state 798 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 799 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 800 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 801 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 802 chan->required_security_level = LEVEL_0; 803 804 // add to connections list 805 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 806 807 // check if hci connection is already usable 808 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 809 if (conn){ 810 log_info("l2cap_create_channel_internal, hci connection already exists"); 811 l2cap_handle_connection_complete(conn->con_handle, chan); 812 // check ir remote supported fearures are already received 813 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 814 l2cap_handle_remote_supported_features_received(chan); 815 } 816 } 817 818 l2cap_run(); 819 } 820 821 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 822 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 823 // find channel for local_cid 824 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 825 if (channel) { 826 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 827 } 828 // process 829 l2cap_run(); 830 } 831 832 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 833 linked_list_iterator_t it; 834 linked_list_iterator_init(&it, &l2cap_channels); 835 while (linked_list_iterator_has_next(&it)){ 836 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 837 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 838 // channel for this address found 839 switch (channel->state){ 840 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 841 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 842 // failure, forward error code 843 l2cap_emit_channel_opened(channel, status); 844 // discard channel 845 l2cap_stop_rtx(channel); 846 linked_list_iterator_remove(&it); 847 btstack_memory_l2cap_channel_free(channel); 848 break; 849 default: 850 break; 851 } 852 } 853 } 854 855 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 856 linked_list_iterator_t it; 857 linked_list_iterator_init(&it, &l2cap_channels); 858 while (linked_list_iterator_has_next(&it)){ 859 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 860 if ( ! BD_ADDR_CMP( channel->address, address) ){ 861 l2cap_handle_connection_complete(handle, channel); 862 } 863 } 864 // process 865 l2cap_run(); 866 } 867 868 void l2cap_event_handler(uint8_t *packet, uint16_t size){ 869 870 bd_addr_t address; 871 hci_con_handle_t handle; 872 linked_list_iterator_t it; 873 int hci_con_used; 874 875 switch(packet[0]){ 876 877 // handle connection complete events 878 case HCI_EVENT_CONNECTION_COMPLETE: 879 bt_flip_addr(address, &packet[5]); 880 if (packet[2] == 0){ 881 handle = READ_BT_16(packet, 3); 882 l2cap_handle_connection_success_for_addr(address, handle); 883 } else { 884 l2cap_handle_connection_failed_for_addr(address, packet[2]); 885 } 886 break; 887 888 // handle successful create connection cancel command 889 case HCI_EVENT_COMMAND_COMPLETE: 890 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 891 if (packet[5] == 0){ 892 bt_flip_addr(address, &packet[6]); 893 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 894 l2cap_handle_connection_failed_for_addr(address, 0x16); 895 } 896 } 897 l2cap_run(); // try sending signaling packets first 898 break; 899 900 case HCI_EVENT_COMMAND_STATUS: 901 l2cap_run(); // try sending signaling packets first 902 break; 903 904 // handle disconnection complete events 905 case HCI_EVENT_DISCONNECTION_COMPLETE: 906 // send l2cap disconnect events for all channels on this handle and free them 907 handle = READ_BT_16(packet, 3); 908 linked_list_iterator_init(&it, &l2cap_channels); 909 while (linked_list_iterator_has_next(&it)){ 910 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 911 if (channel->handle != handle) continue; 912 l2cap_emit_channel_closed(channel); 913 l2cap_stop_rtx(channel); 914 linked_list_iterator_remove(&it); 915 btstack_memory_l2cap_channel_free(channel); 916 } 917 break; 918 919 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 920 l2cap_run(); // try sending signaling packets first 921 l2cap_hand_out_credits(); 922 break; 923 924 // HCI Connection Timeouts 925 case L2CAP_EVENT_TIMEOUT_CHECK: 926 handle = READ_BT_16(packet, 2); 927 if (hci_authentication_active_for_handle(handle)) break; 928 hci_con_used = 0; 929 linked_list_iterator_init(&it, &l2cap_channels); 930 while (linked_list_iterator_has_next(&it)){ 931 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 932 if (channel->handle != handle) continue; 933 hci_con_used = 1; 934 break; 935 } 936 if (hci_con_used) break; 937 if (!hci_can_send_command_packet_now()) break; 938 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 939 break; 940 941 case DAEMON_EVENT_HCI_PACKET_SENT: 942 linked_list_iterator_init(&it, &l2cap_channels); 943 while (linked_list_iterator_has_next(&it)){ 944 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 945 if (!channel->packet_handler) continue; 946 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 947 } 948 if (attribute_protocol_packet_handler) { 949 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 950 } 951 if (security_protocol_packet_handler) { 952 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 953 } 954 if (connectionless_channel_packet_handler) { 955 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 956 } 957 break; 958 959 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 960 handle = READ_BT_16(packet, 3); 961 linked_list_iterator_init(&it, &l2cap_channels); 962 while (linked_list_iterator_has_next(&it)){ 963 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 964 if (channel->handle != handle) continue; 965 l2cap_handle_remote_supported_features_received(channel); 966 break; 967 } 968 break; 969 970 case GAP_SECURITY_LEVEL: 971 handle = READ_BT_16(packet, 2); 972 log_info("l2cap - security level update"); 973 linked_list_iterator_init(&it, &l2cap_channels); 974 while (linked_list_iterator_has_next(&it)){ 975 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 976 if (channel->handle != handle) continue; 977 978 log_info("l2cap - state %u", channel->state); 979 980 gap_security_level_t actual_level = packet[4]; 981 gap_security_level_t required_level = channel->required_security_level; 982 983 switch (channel->state){ 984 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 985 if (actual_level >= required_level){ 986 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 987 l2cap_emit_connection_request(channel); 988 } else { 989 channel->reason = 0x03; // security block 990 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 991 } 992 break; 993 994 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 995 if (actual_level >= required_level){ 996 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 997 } else { 998 // disconnnect, authentication not good enough 999 hci_disconnect_security_block(handle); 1000 } 1001 break; 1002 1003 default: 1004 break; 1005 } 1006 } 1007 break; 1008 1009 default: 1010 break; 1011 } 1012 1013 // pass on: main packet handler, att and sm packet handlers 1014 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1015 if (attribute_protocol_packet_handler){ 1016 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1017 } 1018 if (security_protocol_packet_handler) { 1019 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1020 } 1021 if (connectionless_channel_packet_handler) { 1022 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1023 } 1024 1025 l2cap_run(); 1026 } 1027 1028 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1029 channel->remote_sig_id = identifier; 1030 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1031 l2cap_run(); 1032 } 1033 1034 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1035 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1036 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1037 signaling_responses[signaling_responses_pending].handle = handle; 1038 signaling_responses[signaling_responses_pending].code = code; 1039 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1040 signaling_responses[signaling_responses_pending].data = data; 1041 signaling_responses_pending++; 1042 l2cap_run(); 1043 } 1044 } 1045 1046 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1047 1048 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1049 l2cap_service_t *service = l2cap_get_service(psm); 1050 if (!service) { 1051 // 0x0002 PSM not supported 1052 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1053 return; 1054 } 1055 1056 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1057 if (!hci_connection) { 1058 // 1059 log_error("no hci_connection for handle %u", handle); 1060 return; 1061 } 1062 1063 // reject connection (0x03 security block) and disconnect if both have SSP, connection is not encrypted and PSM != SDP 1064 if ( hci_ssp_supported_on_both_sides(handle) 1065 && gap_security_level(handle) == LEVEL_0 1066 && !l2cap_security_level_0_allowed_for_PSM(psm)){ 1067 1068 // 0x0003 Security Block 1069 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0003); 1070 return; 1071 } 1072 1073 1074 // alloc structure 1075 // log_info("l2cap_handle_connection_request register channel"); 1076 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1077 if (!channel){ 1078 // 0x0004 No resources available 1079 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1080 return; 1081 } 1082 // Init memory (make valgrind happy) 1083 memset(channel, 0, sizeof(l2cap_channel_t)); 1084 // fill in 1085 BD_ADDR_COPY(channel->address, hci_connection->address); 1086 channel->psm = psm; 1087 channel->handle = handle; 1088 channel->connection = service->connection; 1089 channel->packet_handler = service->packet_handler; 1090 channel->local_cid = l2cap_next_local_cid(); 1091 channel->remote_cid = source_cid; 1092 channel->local_mtu = service->mtu; 1093 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1094 channel->packets_granted = 0; 1095 channel->remote_sig_id = sig_id; 1096 channel->required_security_level = service->required_security_level; 1097 1098 // limit local mtu to max acl packet length - l2cap header 1099 if (channel->local_mtu > l2cap_max_mtu()) { 1100 channel->local_mtu = l2cap_max_mtu(); 1101 } 1102 1103 // set initial state 1104 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1105 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1106 1107 // add to connections list 1108 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1109 1110 // assert security requirements 1111 gap_request_security_level(handle, channel->required_security_level); 1112 } 1113 1114 void l2cap_accept_connection_internal(uint16_t local_cid){ 1115 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1116 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1117 if (!channel) { 1118 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1119 return; 1120 } 1121 1122 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1123 1124 // process 1125 l2cap_run(); 1126 } 1127 1128 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1129 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1130 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1131 if (!channel) { 1132 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1133 return; 1134 } 1135 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1136 channel->reason = reason; 1137 l2cap_run(); 1138 } 1139 1140 void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1141 1142 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1143 1144 uint16_t flags = READ_BT_16(command, 6); 1145 if (flags & 1) { 1146 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1147 } 1148 1149 // accept the other's configuration options 1150 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1151 uint16_t pos = 8; 1152 while (pos < end_pos){ 1153 uint8_t option_hint = command[pos] >> 7; 1154 uint8_t option_type = command[pos] & 0x7f; 1155 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1156 pos++; 1157 uint8_t length = command[pos++]; 1158 // MTU { type(8): 1, len(8):2, MTU(16) } 1159 if (option_type == 1 && length == 2){ 1160 channel->remote_mtu = READ_BT_16(command, pos); 1161 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1162 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1163 } 1164 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1165 if (option_type == 2 && length == 2){ 1166 channel->flush_timeout = READ_BT_16(command, pos); 1167 } 1168 // check for unknown options 1169 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1170 log_info("l2cap cid %u, unknown options", channel->local_cid); 1171 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1172 } 1173 pos += length; 1174 } 1175 } 1176 1177 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1178 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1179 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1180 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1181 return 1; 1182 } 1183 1184 1185 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1186 1187 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1188 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1189 uint16_t result = 0; 1190 1191 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1192 1193 // handle DISCONNECT REQUESTS seperately 1194 if (code == DISCONNECTION_REQUEST){ 1195 switch (channel->state){ 1196 case L2CAP_STATE_CONFIG: 1197 case L2CAP_STATE_OPEN: 1198 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1199 case L2CAP_STATE_WAIT_DISCONNECT: 1200 l2cap_handle_disconnect_request(channel, identifier); 1201 break; 1202 1203 default: 1204 // ignore in other states 1205 break; 1206 } 1207 return; 1208 } 1209 1210 // @STATEMACHINE(l2cap) 1211 switch (channel->state) { 1212 1213 case L2CAP_STATE_WAIT_CONNECT_RSP: 1214 switch (code){ 1215 case CONNECTION_RESPONSE: 1216 l2cap_stop_rtx(channel); 1217 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1218 switch (result) { 1219 case 0: 1220 // successful connection 1221 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1222 channel->state = L2CAP_STATE_CONFIG; 1223 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1224 break; 1225 case 1: 1226 // connection pending. get some coffee, but start the ERTX 1227 l2cap_start_ertx(channel); 1228 break; 1229 default: 1230 // channel closed 1231 channel->state = L2CAP_STATE_CLOSED; 1232 // map l2cap connection response result to BTstack status enumeration 1233 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1234 1235 // drop link key if security block 1236 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1237 hci_drop_link_key_for_bd_addr(channel->address); 1238 } 1239 1240 // discard channel 1241 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1242 btstack_memory_l2cap_channel_free(channel); 1243 break; 1244 } 1245 break; 1246 1247 default: 1248 //@TODO: implement other signaling packets 1249 break; 1250 } 1251 break; 1252 1253 case L2CAP_STATE_CONFIG: 1254 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1255 switch (code) { 1256 case CONFIGURE_REQUEST: 1257 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1258 l2cap_signaling_handle_configure_request(channel, command); 1259 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1260 // only done if continuation not set 1261 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1262 } 1263 break; 1264 case CONFIGURE_RESPONSE: 1265 l2cap_stop_rtx(channel); 1266 switch (result){ 1267 case 0: // success 1268 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1269 break; 1270 case 4: // pending 1271 l2cap_start_ertx(channel); 1272 break; 1273 default: 1274 // retry on negative result 1275 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1276 break; 1277 } 1278 break; 1279 default: 1280 break; 1281 } 1282 if (l2cap_channel_ready_for_open(channel)){ 1283 // for open: 1284 channel->state = L2CAP_STATE_OPEN; 1285 l2cap_emit_channel_opened(channel, 0); 1286 l2cap_emit_credits(channel, 1); 1287 } 1288 break; 1289 1290 case L2CAP_STATE_WAIT_DISCONNECT: 1291 switch (code) { 1292 case DISCONNECTION_RESPONSE: 1293 l2cap_finialize_channel_close(channel); 1294 break; 1295 default: 1296 //@TODO: implement other signaling packets 1297 break; 1298 } 1299 break; 1300 1301 case L2CAP_STATE_CLOSED: 1302 // @TODO handle incoming requests 1303 break; 1304 1305 case L2CAP_STATE_OPEN: 1306 //@TODO: implement other signaling packets, e.g. re-configure 1307 break; 1308 default: 1309 break; 1310 } 1311 // log_info("new state %u", channel->state); 1312 } 1313 1314 1315 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1316 1317 // get code, signalind identifier and command len 1318 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1319 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1320 1321 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1322 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1323 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1324 return; 1325 } 1326 1327 // general commands without an assigned channel 1328 switch(code) { 1329 1330 case CONNECTION_REQUEST: { 1331 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1332 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1333 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1334 return; 1335 } 1336 1337 case ECHO_REQUEST: 1338 l2cap_register_signaling_response(handle, code, sig_id, 0); 1339 return; 1340 1341 case INFORMATION_REQUEST: { 1342 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1343 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1344 return; 1345 } 1346 1347 default: 1348 break; 1349 } 1350 1351 1352 // Get potential destination CID 1353 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1354 1355 // Find channel for this sig_id and connection handle 1356 linked_list_iterator_t it; 1357 linked_list_iterator_init(&it, &l2cap_channels); 1358 while (linked_list_iterator_has_next(&it)){ 1359 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1360 if (channel->handle != handle) continue; 1361 if (code & 1) { 1362 // match odd commands (responses) by previous signaling identifier 1363 if (channel->local_sig_id == sig_id) { 1364 l2cap_signaling_handler_channel(channel, command); 1365 break; 1366 } 1367 } else { 1368 // match even commands (requests) by local channel id 1369 if (channel->local_cid == dest_cid) { 1370 l2cap_signaling_handler_channel(channel, command); 1371 break; 1372 } 1373 } 1374 } 1375 } 1376 1377 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1378 1379 // Get Channel ID 1380 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1381 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1382 1383 switch (channel_id) { 1384 1385 case L2CAP_CID_SIGNALING: { 1386 1387 uint16_t command_offset = 8; 1388 while (command_offset < size) { 1389 1390 // handle signaling commands 1391 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1392 1393 // increment command_offset 1394 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1395 } 1396 break; 1397 } 1398 1399 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1400 if (attribute_protocol_packet_handler) { 1401 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1402 } 1403 break; 1404 1405 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1406 if (security_protocol_packet_handler) { 1407 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1408 } 1409 break; 1410 1411 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1412 if (connectionless_channel_packet_handler) { 1413 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1414 } 1415 break; 1416 1417 case L2CAP_CID_SIGNALING_LE: { 1418 switch (packet[8]){ 1419 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1420 uint16_t result = READ_BT_16(packet, 12); 1421 l2cap_emit_connection_parameter_update_response(handle, result); 1422 break; 1423 } 1424 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1425 uint8_t event[10]; 1426 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1427 event[1] = 8; 1428 memcpy(&event[2], &packet[12], 8); 1429 1430 hci_connection_t * connection = hci_connection_for_handle(handle); 1431 if (connection){ 1432 int update_parameter = 1; 1433 le_connection_parameter_range_t existing_range = gap_le_get_connection_parameter_range(); 1434 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1435 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1436 uint16_t le_conn_latency = READ_BT_16(packet,16); 1437 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1438 1439 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1440 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1441 1442 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1443 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1444 1445 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1446 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1447 1448 if (update_parameter){ 1449 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1450 connection->le_conn_interval_min = le_conn_interval_min; 1451 connection->le_conn_interval_max = le_conn_interval_max; 1452 connection->le_conn_latency = le_conn_latency; 1453 connection->le_supervision_timeout = le_supervision_timeout; 1454 } else { 1455 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1456 } 1457 } 1458 1459 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1460 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1461 1462 break; 1463 } 1464 default: { 1465 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1466 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1467 break; 1468 } 1469 } 1470 break; 1471 } 1472 1473 default: { 1474 // Find channel for this channel_id and connection handle 1475 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1476 if (channel) { 1477 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1478 } 1479 break; 1480 } 1481 } 1482 } 1483 1484 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1485 switch (packet_type) { 1486 case HCI_EVENT_PACKET: 1487 l2cap_event_handler(packet, size); 1488 break; 1489 case HCI_ACL_DATA_PACKET: 1490 l2cap_acl_handler(packet, size); 1491 break; 1492 default: 1493 break; 1494 } 1495 l2cap_run(); 1496 } 1497 1498 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1499 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1500 channel->state = L2CAP_STATE_CLOSED; 1501 l2cap_emit_channel_closed(channel); 1502 // discard channel 1503 l2cap_stop_rtx(channel); 1504 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1505 btstack_memory_l2cap_channel_free(channel); 1506 } 1507 1508 l2cap_service_t * l2cap_get_service(uint16_t psm){ 1509 linked_list_iterator_t it; 1510 linked_list_iterator_init(&it, &l2cap_services); 1511 while (linked_list_iterator_has_next(&it)){ 1512 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1513 if ( service->psm == psm){ 1514 return service; 1515 }; 1516 } 1517 return NULL; 1518 } 1519 1520 void l2cap_register_service_internal(void *connection, btstack_packet_handler_t packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1521 1522 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1523 1524 // check for alread registered psm 1525 // TODO: emit error event 1526 l2cap_service_t *service = l2cap_get_service(psm); 1527 if (service) { 1528 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1529 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1530 return; 1531 } 1532 1533 // alloc structure 1534 // TODO: emit error event 1535 service = btstack_memory_l2cap_service_get(); 1536 if (!service) { 1537 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1538 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1539 return; 1540 } 1541 1542 // fill in 1543 service->psm = psm; 1544 service->mtu = mtu; 1545 service->connection = connection; 1546 service->packet_handler = packet_handler; 1547 service->required_security_level = security_level; 1548 1549 // add to services list 1550 linked_list_add(&l2cap_services, (linked_item_t *) service); 1551 1552 // enable page scan 1553 hci_connectable_control(1); 1554 1555 // done 1556 l2cap_emit_service_registered(connection, 0, psm); 1557 } 1558 1559 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1560 1561 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1562 1563 l2cap_service_t *service = l2cap_get_service(psm); 1564 if (!service) return; 1565 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1566 btstack_memory_l2cap_service_free(service); 1567 1568 // disable page scan when no services registered 1569 if (!linked_list_empty(&l2cap_services)) return; 1570 hci_connectable_control(0); 1571 } 1572 1573 1574 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1575 void l2cap_register_fixed_channel(btstack_packet_handler_t packet_handler, uint16_t channel_id) { 1576 switch(channel_id){ 1577 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1578 attribute_protocol_packet_handler = packet_handler; 1579 break; 1580 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1581 security_protocol_packet_handler = packet_handler; 1582 break; 1583 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1584 connectionless_channel_packet_handler = packet_handler; 1585 break; 1586 } 1587 } 1588 1589 #ifdef HAVE_BLE 1590 1591 // Request LE connection parameter update 1592 int l2cap_le_request_connection_parameter_update(uint16_t handle, uint16_t interval_min, uint16_t interval_max, uint16_t slave_latency, uint16_t timeout_multiplier){ 1593 if (!hci_can_send_acl_packet_now(handle)){ 1594 log_info("l2cap_send_signaling_packet, cannot send"); 1595 return BTSTACK_ACL_BUFFERS_FULL; 1596 } 1597 // log_info("l2cap_send_signaling_packet type %u", cmd); 1598 hci_reserve_packet_buffer(); 1599 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 1600 uint16_t len = l2cap_le_create_connection_parameter_update_request(acl_buffer, handle, interval_min, interval_max, slave_latency, timeout_multiplier); 1601 return hci_send_acl_packet_buffer(len); 1602 } 1603 #endif 1604 1605