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 uint8_t require_security_level2_for_outgoing_sdp; 84 85 // prototypes 86 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 87 static l2cap_service_t * l2cap_get_service(uint16_t psm); 88 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 89 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 90 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 91 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 92 93 94 void l2cap_init(){ 95 new_credits_blocked = 0; 96 signaling_responses_pending = 0; 97 98 l2cap_channels = NULL; 99 l2cap_services = NULL; 100 101 packet_handler = null_packet_handler; 102 attribute_protocol_packet_handler = NULL; 103 security_protocol_packet_handler = NULL; 104 105 require_security_level2_for_outgoing_sdp = 0; 106 107 // 108 // register callback with HCI 109 // 110 hci_register_packet_handler(&l2cap_packet_handler); 111 hci_connectable_control(0); // no services yet 112 } 113 114 115 /** Register L2CAP packet handlers */ 116 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 117 } 118 void l2cap_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 119 packet_handler = handler; 120 } 121 122 // notify client/protocol handler 123 void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 124 if (channel->packet_handler) { 125 (* (channel->packet_handler))(type, channel->local_cid, data, size); 126 } else { 127 (*packet_handler)(channel->connection, type, channel->local_cid, data, size); 128 } 129 } 130 131 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 132 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", 133 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 134 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 135 uint8_t event[23]; 136 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 137 event[1] = sizeof(event) - 2; 138 event[2] = status; 139 bt_flip_addr(&event[3], channel->address); 140 bt_store_16(event, 9, channel->handle); 141 bt_store_16(event, 11, channel->psm); 142 bt_store_16(event, 13, channel->local_cid); 143 bt_store_16(event, 15, channel->remote_cid); 144 bt_store_16(event, 17, channel->local_mtu); 145 bt_store_16(event, 19, channel->remote_mtu); 146 bt_store_16(event, 21, channel->flush_timeout); 147 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 148 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 149 } 150 151 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 152 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 153 uint8_t event[4]; 154 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 155 event[1] = sizeof(event) - 2; 156 bt_store_16(event, 2, channel->local_cid); 157 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 158 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 159 } 160 161 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 162 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 163 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 164 uint8_t event[16]; 165 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 166 event[1] = sizeof(event) - 2; 167 bt_flip_addr(&event[2], channel->address); 168 bt_store_16(event, 8, channel->handle); 169 bt_store_16(event, 10, channel->psm); 170 bt_store_16(event, 12, channel->local_cid); 171 bt_store_16(event, 14, channel->remote_cid); 172 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 173 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 174 } 175 176 void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 177 uint8_t event[6]; 178 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 179 event[1] = 4; 180 bt_store_16(event, 2, handle); 181 bt_store_16(event, 4, result); 182 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 183 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 184 } 185 186 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 187 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 188 uint8_t event[5]; 189 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 190 event[1] = sizeof(event) - 2; 191 event[2] = status; 192 bt_store_16(event, 3, psm); 193 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 194 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 195 } 196 197 void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 198 199 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 200 // track credits 201 channel->packets_granted += credits; 202 203 uint8_t event[5]; 204 event[0] = L2CAP_EVENT_CREDITS; 205 event[1] = sizeof(event) - 2; 206 bt_store_16(event, 2, channel->local_cid); 207 event[4] = credits; 208 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 209 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 210 } 211 212 void l2cap_block_new_credits(uint8_t blocked){ 213 new_credits_blocked = blocked; 214 } 215 216 void l2cap_hand_out_credits(void){ 217 218 if (new_credits_blocked) return; // we're told not to. used by daemon 219 220 linked_list_iterator_t it; 221 linked_list_iterator_init(&it, &l2cap_channels); 222 while (linked_list_iterator_has_next(&it)){ 223 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 224 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 225 if (channel->state != L2CAP_STATE_OPEN) continue; 226 if (hci_number_outgoing_packets(channel->handle) < NR_BUFFERED_ACL_PACKETS && channel->packets_granted == 0) { 227 l2cap_emit_credits(channel, 1); 228 } 229 } 230 } 231 232 l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 233 linked_list_iterator_t it; 234 linked_list_iterator_init(&it, &l2cap_channels); 235 while (linked_list_iterator_has_next(&it)){ 236 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 237 if ( channel->local_cid == local_cid) { 238 return channel; 239 } 240 } 241 return NULL; 242 } 243 244 int l2cap_can_send_packet_now(uint16_t local_cid){ 245 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 246 if (!channel) return 0; 247 if (!channel->packets_granted) return 0; 248 return hci_can_send_acl_packet_now(channel->handle); 249 } 250 251 // @deprecated 252 int l2cap_can_send_connectionless_packet_now(void){ 253 // TODO provide real handle 254 return l2cap_can_send_fixed_channel_packet_now(0x1234); 255 } 256 257 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 258 return hci_can_send_acl_packet_now(handle); 259 } 260 261 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 262 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 263 if (channel) { 264 return channel->remote_mtu; 265 } 266 return 0; 267 } 268 269 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 270 linked_list_iterator_t it; 271 linked_list_iterator_init(&it, &l2cap_channels); 272 while (linked_list_iterator_has_next(&it)){ 273 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 274 if ( &channel->rtx == ts) { 275 return channel; 276 } 277 } 278 return NULL; 279 } 280 281 static void l2cap_rtx_timeout(timer_source_t * ts){ 282 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 283 if (!ts) return; 284 285 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 286 287 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 288 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 289 // notify client 290 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 291 292 // discard channel 293 // no need to stop timer here, it is removed from list during timer callback 294 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 295 btstack_memory_l2cap_channel_free(channel); 296 } 297 298 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 299 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 300 run_loop_remove_timer(&channel->rtx); 301 } 302 303 static void l2cap_start_rtx(l2cap_channel_t * channel){ 304 l2cap_stop_rtx(channel); 305 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 306 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 307 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 308 run_loop_add_timer(&channel->rtx); 309 } 310 311 static void l2cap_start_ertx(l2cap_channel_t * channel){ 312 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 313 l2cap_stop_rtx(channel); 314 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 315 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 316 run_loop_add_timer(&channel->rtx); 317 } 318 319 void l2cap_require_security_level_2_for_outgoing_sdp(){ 320 require_security_level2_for_outgoing_sdp = 1; 321 } 322 323 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 324 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 325 } 326 327 int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 328 329 if (!hci_can_send_acl_packet_now(handle)){ 330 log_info("l2cap_send_signaling_packet, cannot send"); 331 return BTSTACK_ACL_BUFFERS_FULL; 332 } 333 334 // log_info("l2cap_send_signaling_packet type %u", cmd); 335 hci_reserve_packet_buffer(); 336 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 337 va_list argptr; 338 va_start(argptr, identifier); 339 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 340 va_end(argptr); 341 // log_info("l2cap_send_signaling_packet con %u!", handle); 342 return hci_send_acl_packet_buffer(len); 343 } 344 345 #ifdef HAVE_BLE 346 int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 347 348 if (!hci_can_send_acl_packet_now(handle)){ 349 log_info("l2cap_send_signaling_packet, cannot send"); 350 return BTSTACK_ACL_BUFFERS_FULL; 351 } 352 353 // log_info("l2cap_send_signaling_packet type %u", cmd); 354 hci_reserve_packet_buffer(); 355 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 356 va_list argptr; 357 va_start(argptr, identifier); 358 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 359 va_end(argptr); 360 // log_info("l2cap_send_signaling_packet con %u!", handle); 361 return hci_send_acl_packet_buffer(len); 362 } 363 #endif 364 365 uint8_t *l2cap_get_outgoing_buffer(void){ 366 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 367 } 368 369 int l2cap_reserve_packet_buffer(void){ 370 return hci_reserve_packet_buffer(); 371 } 372 373 void l2cap_release_packet_buffer(void){ 374 hci_release_packet_buffer(); 375 } 376 377 378 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 379 380 if (!hci_is_packet_buffer_reserved()){ 381 log_error("l2cap_send_prepared called without reserving packet first"); 382 return BTSTACK_ACL_BUFFERS_FULL; 383 } 384 385 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 386 if (!channel) { 387 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 388 return -1; // TODO: define error 389 } 390 391 if (channel->packets_granted == 0){ 392 log_error("l2cap_send_prepared cid 0x%02x, no credits!", local_cid); 393 return -1; // TODO: define error 394 } 395 396 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 397 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 398 return BTSTACK_ACL_BUFFERS_FULL; 399 } 400 401 --channel->packets_granted; 402 403 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used, credits left %u;", 404 local_cid, channel->handle, channel->packets_granted); 405 406 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 407 408 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 409 410 // 0 - Connection handle : PB=pb : BC=00 411 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 412 // 2 - ACL length 413 bt_store_16(acl_buffer, 2, len + 4); 414 // 4 - L2CAP packet length 415 bt_store_16(acl_buffer, 4, len + 0); 416 // 6 - L2CAP channel DEST 417 bt_store_16(acl_buffer, 6, channel->remote_cid); 418 // send 419 int err = hci_send_acl_packet_buffer(len+8); 420 421 l2cap_hand_out_credits(); 422 423 return err; 424 } 425 426 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 427 428 if (!hci_is_packet_buffer_reserved()){ 429 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 430 return BTSTACK_ACL_BUFFERS_FULL; 431 } 432 433 if (!hci_can_send_prepared_acl_packet_now(handle)){ 434 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 435 return BTSTACK_ACL_BUFFERS_FULL; 436 } 437 438 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 439 440 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 441 442 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 443 444 // 0 - Connection handle : PB=pb : BC=00 445 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 446 // 2 - ACL length 447 bt_store_16(acl_buffer, 2, len + 4); 448 // 4 - L2CAP packet length 449 bt_store_16(acl_buffer, 4, len + 0); 450 // 6 - L2CAP channel DEST 451 bt_store_16(acl_buffer, 6, cid); 452 // send 453 int err = hci_send_acl_packet_buffer(len+8); 454 455 l2cap_hand_out_credits(); 456 457 return err; 458 } 459 460 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 461 462 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 463 if (!channel) { 464 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 465 return -1; // TODO: define error 466 } 467 468 if (len > channel->remote_mtu){ 469 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 470 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 471 } 472 473 if (!hci_can_send_acl_packet_now(channel->handle)){ 474 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 475 return BTSTACK_ACL_BUFFERS_FULL; 476 } 477 478 hci_reserve_packet_buffer(); 479 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 480 481 memcpy(&acl_buffer[8], data, len); 482 483 return l2cap_send_prepared(local_cid, len); 484 } 485 486 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 487 488 if (!hci_can_send_acl_packet_now(handle)){ 489 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 490 return BTSTACK_ACL_BUFFERS_FULL; 491 } 492 493 hci_reserve_packet_buffer(); 494 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 495 496 memcpy(&acl_buffer[8], data, len); 497 498 return l2cap_send_prepared_connectionless(handle, cid, len); 499 } 500 501 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 502 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 503 } 504 505 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 506 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 507 } 508 509 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 510 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 511 } 512 513 514 515 // MARK: L2CAP_RUN 516 // process outstanding signaling tasks 517 void l2cap_run(void){ 518 519 // check pending signaling responses 520 while (signaling_responses_pending){ 521 522 hci_con_handle_t handle = signaling_responses[0].handle; 523 524 if (!hci_can_send_acl_packet_now(handle)) break; 525 526 uint8_t sig_id = signaling_responses[0].sig_id; 527 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 528 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 529 uint8_t response_code = signaling_responses[0].code; 530 531 // remove first item before sending (to avoid sending response mutliple times) 532 signaling_responses_pending--; 533 int i; 534 for (i=0; i < signaling_responses_pending; i++){ 535 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 536 } 537 538 switch (response_code){ 539 case CONNECTION_REQUEST: 540 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 541 // also disconnect if result is 0x0003 - security blocked 542 if (result == 0x0003){ 543 hci_disconnect_security_block(handle); 544 } 545 break; 546 case ECHO_REQUEST: 547 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 548 break; 549 case INFORMATION_REQUEST: 550 switch (infoType){ 551 case 1: { // Connectionless MTU 552 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 553 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 554 break; 555 } 556 case 2: { // Extended Features Supported 557 // extended features request supported, only supporing fixed channel map 558 uint32_t features = 0x80; 559 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 560 break; 561 } 562 case 3: { // Fixed Channels Supported 563 uint8_t map[8]; 564 memset(map, 0, 8); 565 map[0] = 0x01; // L2CAP Signaling Channel 566 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 567 break; 568 } 569 default: 570 // all other types are not supported 571 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 572 break; 573 } 574 break; 575 case COMMAND_REJECT: 576 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 577 #ifdef HAVE_BLE 578 case COMMAND_REJECT_LE: 579 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 580 break; 581 #endif 582 default: 583 // should not happen 584 break; 585 } 586 } 587 588 uint8_t config_options[4]; 589 linked_list_iterator_t it; 590 linked_list_iterator_init(&it, &l2cap_channels); 591 while (linked_list_iterator_has_next(&it)){ 592 593 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 594 // log_info("l2cap_run: state %u, var 0x%02x", channel->state, channel->state_var); 595 switch (channel->state){ 596 597 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 598 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 599 if (!hci_can_send_acl_packet_now(channel->handle)) break; 600 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 601 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 602 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 603 } 604 break; 605 606 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 607 if (!hci_can_send_command_packet_now()) break; 608 // send connection request - set state first 609 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 610 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 611 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 612 break; 613 614 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 615 if (!hci_can_send_acl_packet_now(channel->handle)) break; 616 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 617 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 618 l2cap_stop_rtx(channel); 619 linked_list_iterator_remove(&it); 620 btstack_memory_l2cap_channel_free(channel); 621 break; 622 623 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 624 if (!hci_can_send_acl_packet_now(channel->handle)) break; 625 channel->state = L2CAP_STATE_CONFIG; 626 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 627 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 628 break; 629 630 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 631 if (!hci_can_send_acl_packet_now(channel->handle)) break; 632 // success, start l2cap handshake 633 channel->local_sig_id = l2cap_next_sig_id(); 634 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 635 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 636 l2cap_start_rtx(channel); 637 break; 638 639 case L2CAP_STATE_CONFIG: 640 if (!hci_can_send_acl_packet_now(channel->handle)) break; 641 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 642 uint16_t flags = 0; 643 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 644 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 645 flags = 1; 646 } else { 647 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 648 } 649 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 650 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 651 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 652 config_options[0] = 1; // MTU 653 config_options[1] = 2; // len param 654 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 655 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 656 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 657 } else { 658 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 659 } 660 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 661 } 662 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 663 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 664 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 665 channel->local_sig_id = l2cap_next_sig_id(); 666 config_options[0] = 1; // MTU 667 config_options[1] = 2; // len param 668 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 669 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 670 l2cap_start_rtx(channel); 671 } 672 if (l2cap_channel_ready_for_open(channel)){ 673 channel->state = L2CAP_STATE_OPEN; 674 l2cap_emit_channel_opened(channel, 0); // success 675 l2cap_emit_credits(channel, 1); 676 } 677 break; 678 679 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 680 if (!hci_can_send_acl_packet_now(channel->handle)) break; 681 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 682 // 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 :) 683 l2cap_finialize_channel_close(channel); // -- remove from list 684 break; 685 686 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 687 if (!hci_can_send_acl_packet_now(channel->handle)) break; 688 channel->local_sig_id = l2cap_next_sig_id(); 689 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 690 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 691 break; 692 default: 693 break; 694 } 695 } 696 697 #ifdef HAVE_BLE 698 // send l2cap con paramter update if necessary 699 hci_connections_get_iterator(&it); 700 while(linked_list_iterator_has_next(&it)){ 701 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 702 int result; 703 704 switch (connection->le_con_parameter_update_state){ 705 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 706 result = 0; 707 break; 708 case CON_PARAMETER_UPDATE_DENY: 709 result = 1; 710 break; 711 default: 712 result = -1; 713 break; 714 } 715 if (result < 0) break; 716 717 if (!hci_can_send_acl_packet_now(connection->con_handle)) break; 718 hci_reserve_packet_buffer(); 719 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 720 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 721 uint16_t len = l2cap_le_create_connection_parameter_update_response(acl_buffer, connection->con_handle, 0); 722 hci_send_acl_packet_buffer(len); 723 } 724 #endif 725 726 } 727 728 uint16_t l2cap_max_mtu(void){ 729 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 730 } 731 732 uint16_t l2cap_max_le_mtu(){ 733 return l2cap_max_mtu(); 734 } 735 736 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 737 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 738 log_info("l2cap_handle_connection_complete expected state"); 739 // success, start l2cap handshake 740 channel->handle = handle; 741 channel->local_cid = l2cap_next_local_cid(); 742 // check remote SSP feature first 743 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 744 } 745 } 746 747 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 748 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 749 750 // we have been waiting for remote supported features, if both support SSP, 751 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)); 752 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 753 // request security level 2 754 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 755 gap_request_security_level(channel->handle, LEVEL_2); 756 return; 757 } 758 // fine, go ahead 759 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 760 } 761 762 // open outgoing L2CAP channel 763 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t packet_handler, 764 bd_addr_t address, uint16_t psm, uint16_t mtu){ 765 766 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 767 768 // alloc structure 769 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 770 if (!chan) { 771 // emit error event 772 l2cap_channel_t dummy_channel; 773 BD_ADDR_COPY(dummy_channel.address, address); 774 dummy_channel.psm = psm; 775 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 776 return; 777 } 778 // Init memory (make valgrind happy) 779 memset(chan, 0, sizeof(l2cap_channel_t)); 780 // limit local mtu to max acl packet length - l2cap header 781 if (mtu > l2cap_max_mtu()) { 782 mtu = l2cap_max_mtu(); 783 } 784 785 // fill in 786 BD_ADDR_COPY(chan->address, address); 787 chan->psm = psm; 788 chan->handle = 0; 789 chan->connection = connection; 790 chan->packet_handler = packet_handler; 791 chan->remote_mtu = L2CAP_MINIMAL_MTU; 792 chan->local_mtu = mtu; 793 chan->packets_granted = 0; 794 795 // set initial state 796 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 797 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 798 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 799 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 800 chan->required_security_level = LEVEL_0; 801 802 // add to connections list 803 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 804 805 // check if hci connection is already usable 806 hci_connection_t * conn = hci_connection_for_bd_addr_and_type((bd_addr_t*)address, BD_ADDR_TYPE_CLASSIC); 807 if (conn){ 808 log_info("l2cap_create_channel_internal, hci connection already exists"); 809 l2cap_handle_connection_complete(conn->con_handle, chan); 810 // check ir remote supported fearures are already received 811 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 812 l2cap_handle_remote_supported_features_received(chan); 813 } 814 } 815 816 l2cap_run(); 817 } 818 819 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 820 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 821 // find channel for local_cid 822 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 823 if (channel) { 824 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 825 } 826 // process 827 l2cap_run(); 828 } 829 830 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 831 linked_list_iterator_t it; 832 linked_list_iterator_init(&it, &l2cap_channels); 833 while (linked_list_iterator_has_next(&it)){ 834 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 835 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 836 // channel for this address found 837 switch (channel->state){ 838 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 839 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 840 // failure, forward error code 841 l2cap_emit_channel_opened(channel, status); 842 // discard channel 843 l2cap_stop_rtx(channel); 844 linked_list_iterator_remove(&it); 845 btstack_memory_l2cap_channel_free(channel); 846 break; 847 default: 848 break; 849 } 850 } 851 } 852 853 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 854 linked_list_iterator_t it; 855 linked_list_iterator_init(&it, &l2cap_channels); 856 while (linked_list_iterator_has_next(&it)){ 857 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 858 if ( ! BD_ADDR_CMP( channel->address, address) ){ 859 l2cap_handle_connection_complete(handle, channel); 860 } 861 } 862 // process 863 l2cap_run(); 864 } 865 866 void l2cap_event_handler(uint8_t *packet, uint16_t size){ 867 868 bd_addr_t address; 869 hci_con_handle_t handle; 870 linked_list_iterator_t it; 871 int hci_con_used; 872 873 switch(packet[0]){ 874 875 // handle connection complete events 876 case HCI_EVENT_CONNECTION_COMPLETE: 877 bt_flip_addr(address, &packet[5]); 878 if (packet[2] == 0){ 879 handle = READ_BT_16(packet, 3); 880 l2cap_handle_connection_success_for_addr(address, handle); 881 } else { 882 l2cap_handle_connection_failed_for_addr(address, packet[2]); 883 } 884 break; 885 886 // handle successful create connection cancel command 887 case HCI_EVENT_COMMAND_COMPLETE: 888 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 889 if (packet[5] == 0){ 890 bt_flip_addr(address, &packet[6]); 891 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 892 l2cap_handle_connection_failed_for_addr(address, 0x16); 893 } 894 } 895 l2cap_run(); // try sending signaling packets first 896 break; 897 898 case HCI_EVENT_COMMAND_STATUS: 899 l2cap_run(); // try sending signaling packets first 900 break; 901 902 // handle disconnection complete events 903 case HCI_EVENT_DISCONNECTION_COMPLETE: 904 // send l2cap disconnect events for all channels on this handle and free them 905 handle = READ_BT_16(packet, 3); 906 linked_list_iterator_init(&it, &l2cap_channels); 907 while (linked_list_iterator_has_next(&it)){ 908 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 909 if (channel->handle != handle) continue; 910 l2cap_emit_channel_closed(channel); 911 l2cap_stop_rtx(channel); 912 linked_list_iterator_remove(&it); 913 btstack_memory_l2cap_channel_free(channel); 914 } 915 break; 916 917 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 918 l2cap_run(); // try sending signaling packets first 919 l2cap_hand_out_credits(); 920 break; 921 922 // HCI Connection Timeouts 923 case L2CAP_EVENT_TIMEOUT_CHECK: 924 handle = READ_BT_16(packet, 2); 925 if (hci_authentication_active_for_handle(handle)) break; 926 hci_con_used = 0; 927 linked_list_iterator_init(&it, &l2cap_channels); 928 while (linked_list_iterator_has_next(&it)){ 929 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 930 if (channel->handle != handle) continue; 931 hci_con_used = 1; 932 break; 933 } 934 if (hci_con_used) break; 935 if (!hci_can_send_command_packet_now()) break; 936 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 937 break; 938 939 case DAEMON_EVENT_HCI_PACKET_SENT: 940 linked_list_iterator_init(&it, &l2cap_channels); 941 while (linked_list_iterator_has_next(&it)){ 942 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 943 if (!channel->packet_handler) continue; 944 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 945 } 946 if (attribute_protocol_packet_handler) { 947 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 948 } 949 if (security_protocol_packet_handler) { 950 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 951 } 952 break; 953 954 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 955 handle = READ_BT_16(packet, 3); 956 linked_list_iterator_init(&it, &l2cap_channels); 957 while (linked_list_iterator_has_next(&it)){ 958 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 959 if (channel->handle != handle) continue; 960 l2cap_handle_remote_supported_features_received(channel); 961 break; 962 } 963 break; 964 965 case GAP_SECURITY_LEVEL: 966 handle = READ_BT_16(packet, 2); 967 log_info("l2cap - security level update"); 968 linked_list_iterator_init(&it, &l2cap_channels); 969 while (linked_list_iterator_has_next(&it)){ 970 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 971 if (channel->handle != handle) continue; 972 973 log_info("l2cap - state %u", channel->state); 974 975 gap_security_level_t actual_level = packet[4]; 976 gap_security_level_t required_level = channel->required_security_level; 977 978 switch (channel->state){ 979 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 980 if (actual_level >= required_level){ 981 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 982 l2cap_emit_connection_request(channel); 983 } else { 984 channel->reason = 0x03; // security block 985 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 986 } 987 break; 988 989 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 990 if (actual_level >= required_level){ 991 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 992 } else { 993 // disconnnect, authentication not good enough 994 hci_disconnect_security_block(handle); 995 } 996 break; 997 998 default: 999 break; 1000 } 1001 } 1002 break; 1003 1004 default: 1005 break; 1006 } 1007 1008 // pass on: main packet handler, att and sm packet handlers 1009 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1010 if (attribute_protocol_packet_handler){ 1011 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1012 } 1013 if (security_protocol_packet_handler) { 1014 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1015 } 1016 1017 l2cap_run(); 1018 } 1019 1020 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1021 channel->remote_sig_id = identifier; 1022 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1023 l2cap_run(); 1024 } 1025 1026 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1027 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1028 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1029 signaling_responses[signaling_responses_pending].handle = handle; 1030 signaling_responses[signaling_responses_pending].code = code; 1031 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1032 signaling_responses[signaling_responses_pending].data = data; 1033 signaling_responses_pending++; 1034 l2cap_run(); 1035 } 1036 } 1037 1038 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1039 1040 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1041 l2cap_service_t *service = l2cap_get_service(psm); 1042 if (!service) { 1043 // 0x0002 PSM not supported 1044 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1045 return; 1046 } 1047 1048 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1049 if (!hci_connection) { 1050 // 1051 log_error("no hci_connection for handle %u", handle); 1052 return; 1053 } 1054 1055 // reject connection (0x03 security block) and disconnect if both have SSP, connection is not encrypted and PSM != SDP 1056 if ( hci_ssp_supported_on_both_sides(handle) 1057 && gap_security_level(handle) == LEVEL_0 1058 && !l2cap_security_level_0_allowed_for_PSM(psm)){ 1059 1060 // 0x0003 Security Block 1061 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0003); 1062 return; 1063 } 1064 1065 1066 // alloc structure 1067 // log_info("l2cap_handle_connection_request register channel"); 1068 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1069 if (!channel){ 1070 // 0x0004 No resources available 1071 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1072 return; 1073 } 1074 // Init memory (make valgrind happy) 1075 memset(channel, 0, sizeof(l2cap_channel_t)); 1076 // fill in 1077 BD_ADDR_COPY(channel->address, hci_connection->address); 1078 channel->psm = psm; 1079 channel->handle = handle; 1080 channel->connection = service->connection; 1081 channel->packet_handler = service->packet_handler; 1082 channel->local_cid = l2cap_next_local_cid(); 1083 channel->remote_cid = source_cid; 1084 channel->local_mtu = service->mtu; 1085 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1086 channel->packets_granted = 0; 1087 channel->remote_sig_id = sig_id; 1088 channel->required_security_level = service->required_security_level; 1089 1090 // limit local mtu to max acl packet length - l2cap header 1091 if (channel->local_mtu > l2cap_max_mtu()) { 1092 channel->local_mtu = l2cap_max_mtu(); 1093 } 1094 1095 // set initial state 1096 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1097 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1098 1099 // add to connections list 1100 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1101 1102 // assert security requirements 1103 gap_request_security_level(handle, channel->required_security_level); 1104 } 1105 1106 void l2cap_accept_connection_internal(uint16_t local_cid){ 1107 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1108 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1109 if (!channel) { 1110 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1111 return; 1112 } 1113 1114 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1115 1116 // process 1117 l2cap_run(); 1118 } 1119 1120 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1121 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1122 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1123 if (!channel) { 1124 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1125 return; 1126 } 1127 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1128 channel->reason = reason; 1129 l2cap_run(); 1130 } 1131 1132 void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1133 1134 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1135 1136 uint16_t flags = READ_BT_16(command, 6); 1137 if (flags & 1) { 1138 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1139 } 1140 1141 // accept the other's configuration options 1142 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1143 uint16_t pos = 8; 1144 while (pos < end_pos){ 1145 uint8_t option_hint = command[pos] >> 7; 1146 uint8_t option_type = command[pos] & 0x7f; 1147 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1148 pos++; 1149 uint8_t length = command[pos++]; 1150 // MTU { type(8): 1, len(8):2, MTU(16) } 1151 if (option_type == 1 && length == 2){ 1152 channel->remote_mtu = READ_BT_16(command, pos); 1153 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1154 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1155 } 1156 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1157 if (option_type == 2 && length == 2){ 1158 channel->flush_timeout = READ_BT_16(command, pos); 1159 } 1160 // check for unknown options 1161 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1162 log_info("l2cap cid %u, unknown options", channel->local_cid); 1163 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1164 } 1165 pos += length; 1166 } 1167 } 1168 1169 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1170 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1171 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1172 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1173 return 1; 1174 } 1175 1176 1177 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1178 1179 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1180 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1181 uint16_t result = 0; 1182 1183 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1184 1185 // handle DISCONNECT REQUESTS seperately 1186 if (code == DISCONNECTION_REQUEST){ 1187 switch (channel->state){ 1188 case L2CAP_STATE_CONFIG: 1189 case L2CAP_STATE_OPEN: 1190 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1191 case L2CAP_STATE_WAIT_DISCONNECT: 1192 l2cap_handle_disconnect_request(channel, identifier); 1193 break; 1194 1195 default: 1196 // ignore in other states 1197 break; 1198 } 1199 return; 1200 } 1201 1202 // @STATEMACHINE(l2cap) 1203 switch (channel->state) { 1204 1205 case L2CAP_STATE_WAIT_CONNECT_RSP: 1206 switch (code){ 1207 case CONNECTION_RESPONSE: 1208 l2cap_stop_rtx(channel); 1209 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1210 switch (result) { 1211 case 0: 1212 // successful connection 1213 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1214 channel->state = L2CAP_STATE_CONFIG; 1215 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1216 break; 1217 case 1: 1218 // connection pending. get some coffee, but start the ERTX 1219 l2cap_start_ertx(channel); 1220 break; 1221 default: 1222 // channel closed 1223 channel->state = L2CAP_STATE_CLOSED; 1224 // map l2cap connection response result to BTstack status enumeration 1225 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1226 1227 // drop link key if security block 1228 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1229 hci_drop_link_key_for_bd_addr(&channel->address); 1230 } 1231 1232 // discard channel 1233 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1234 btstack_memory_l2cap_channel_free(channel); 1235 break; 1236 } 1237 break; 1238 1239 default: 1240 //@TODO: implement other signaling packets 1241 break; 1242 } 1243 break; 1244 1245 case L2CAP_STATE_CONFIG: 1246 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1247 switch (code) { 1248 case CONFIGURE_REQUEST: 1249 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1250 l2cap_signaling_handle_configure_request(channel, command); 1251 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1252 // only done if continuation not set 1253 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1254 } 1255 break; 1256 case CONFIGURE_RESPONSE: 1257 l2cap_stop_rtx(channel); 1258 switch (result){ 1259 case 0: // success 1260 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1261 break; 1262 case 4: // pending 1263 l2cap_start_ertx(channel); 1264 break; 1265 default: 1266 // retry on negative result 1267 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1268 break; 1269 } 1270 break; 1271 default: 1272 break; 1273 } 1274 if (l2cap_channel_ready_for_open(channel)){ 1275 // for open: 1276 channel->state = L2CAP_STATE_OPEN; 1277 l2cap_emit_channel_opened(channel, 0); 1278 l2cap_emit_credits(channel, 1); 1279 } 1280 break; 1281 1282 case L2CAP_STATE_WAIT_DISCONNECT: 1283 switch (code) { 1284 case DISCONNECTION_RESPONSE: 1285 l2cap_finialize_channel_close(channel); 1286 break; 1287 default: 1288 //@TODO: implement other signaling packets 1289 break; 1290 } 1291 break; 1292 1293 case L2CAP_STATE_CLOSED: 1294 // @TODO handle incoming requests 1295 break; 1296 1297 case L2CAP_STATE_OPEN: 1298 //@TODO: implement other signaling packets, e.g. re-configure 1299 break; 1300 default: 1301 break; 1302 } 1303 // log_info("new state %u", channel->state); 1304 } 1305 1306 1307 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1308 1309 // get code, signalind identifier and command len 1310 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1311 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1312 1313 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1314 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1315 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1316 return; 1317 } 1318 1319 // general commands without an assigned channel 1320 switch(code) { 1321 1322 case CONNECTION_REQUEST: { 1323 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1324 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1325 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1326 return; 1327 } 1328 1329 case ECHO_REQUEST: 1330 l2cap_register_signaling_response(handle, code, sig_id, 0); 1331 return; 1332 1333 case INFORMATION_REQUEST: { 1334 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1335 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1336 return; 1337 } 1338 1339 default: 1340 break; 1341 } 1342 1343 1344 // Get potential destination CID 1345 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1346 1347 // Find channel for this sig_id and connection handle 1348 linked_list_iterator_t it; 1349 linked_list_iterator_init(&it, &l2cap_channels); 1350 while (linked_list_iterator_has_next(&it)){ 1351 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1352 if (channel->handle != handle) continue; 1353 if (code & 1) { 1354 // match odd commands (responses) by previous signaling identifier 1355 if (channel->local_sig_id == sig_id) { 1356 l2cap_signaling_handler_channel(channel, command); 1357 break; 1358 } 1359 } else { 1360 // match even commands (requests) by local channel id 1361 if (channel->local_cid == dest_cid) { 1362 l2cap_signaling_handler_channel(channel, command); 1363 break; 1364 } 1365 } 1366 } 1367 } 1368 1369 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1370 1371 // Get Channel ID 1372 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1373 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1374 1375 switch (channel_id) { 1376 1377 case L2CAP_CID_SIGNALING: { 1378 1379 uint16_t command_offset = 8; 1380 while (command_offset < size) { 1381 1382 // handle signaling commands 1383 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1384 1385 // increment command_offset 1386 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1387 } 1388 break; 1389 } 1390 1391 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1392 if (attribute_protocol_packet_handler) { 1393 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1394 } 1395 break; 1396 1397 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1398 if (security_protocol_packet_handler) { 1399 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1400 } 1401 break; 1402 1403 case L2CAP_CID_SIGNALING_LE: { 1404 switch (packet[8]){ 1405 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1406 uint16_t result = READ_BT_16(packet, 12); 1407 l2cap_emit_connection_parameter_update_response(handle, result); 1408 break; 1409 } 1410 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1411 uint8_t event[10]; 1412 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1413 event[1] = 8; 1414 memcpy(&event[2], &packet[12], 8); 1415 1416 hci_connection_t * connection = hci_connection_for_handle(handle); 1417 if (connection){ 1418 int update_parameter = 1; 1419 le_connection_parameter_range_t existing_range = gap_le_get_connection_parameter_range(); 1420 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1421 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1422 uint16_t le_conn_latency = READ_BT_16(packet,16); 1423 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1424 1425 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1426 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1427 1428 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1429 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1430 1431 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1432 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1433 1434 if (update_parameter){ 1435 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1436 connection->le_conn_interval_min = le_conn_interval_min; 1437 connection->le_conn_interval_max = le_conn_interval_max; 1438 connection->le_conn_latency = le_conn_latency; 1439 connection->le_supervision_timeout = le_supervision_timeout; 1440 } else { 1441 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1442 } 1443 } 1444 1445 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1446 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1447 1448 break; 1449 } 1450 default: { 1451 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1452 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1453 break; 1454 } 1455 } 1456 break; 1457 } 1458 1459 default: { 1460 // Find channel for this channel_id and connection handle 1461 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1462 if (channel) { 1463 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1464 } 1465 break; 1466 } 1467 } 1468 } 1469 1470 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1471 switch (packet_type) { 1472 case HCI_EVENT_PACKET: 1473 l2cap_event_handler(packet, size); 1474 break; 1475 case HCI_ACL_DATA_PACKET: 1476 l2cap_acl_handler(packet, size); 1477 break; 1478 default: 1479 break; 1480 } 1481 l2cap_run(); 1482 } 1483 1484 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1485 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1486 channel->state = L2CAP_STATE_CLOSED; 1487 l2cap_emit_channel_closed(channel); 1488 // discard channel 1489 l2cap_stop_rtx(channel); 1490 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1491 btstack_memory_l2cap_channel_free(channel); 1492 } 1493 1494 l2cap_service_t * l2cap_get_service(uint16_t psm){ 1495 linked_list_iterator_t it; 1496 linked_list_iterator_init(&it, &l2cap_services); 1497 while (linked_list_iterator_has_next(&it)){ 1498 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1499 if ( service->psm == psm){ 1500 return service; 1501 }; 1502 } 1503 return NULL; 1504 } 1505 1506 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){ 1507 1508 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1509 1510 // check for alread registered psm 1511 // TODO: emit error event 1512 l2cap_service_t *service = l2cap_get_service(psm); 1513 if (service) { 1514 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1515 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1516 return; 1517 } 1518 1519 // alloc structure 1520 // TODO: emit error event 1521 service = btstack_memory_l2cap_service_get(); 1522 if (!service) { 1523 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1524 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1525 return; 1526 } 1527 1528 // fill in 1529 service->psm = psm; 1530 service->mtu = mtu; 1531 service->connection = connection; 1532 service->packet_handler = packet_handler; 1533 service->required_security_level = security_level; 1534 1535 // add to services list 1536 linked_list_add(&l2cap_services, (linked_item_t *) service); 1537 1538 // enable page scan 1539 hci_connectable_control(1); 1540 1541 // done 1542 l2cap_emit_service_registered(connection, 0, psm); 1543 } 1544 1545 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1546 1547 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1548 1549 l2cap_service_t *service = l2cap_get_service(psm); 1550 if (!service) return; 1551 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1552 btstack_memory_l2cap_service_free(service); 1553 1554 // disable page scan when no services registered 1555 if (!linked_list_empty(&l2cap_services)) return; 1556 hci_connectable_control(0); 1557 } 1558 1559 1560 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1561 void l2cap_register_fixed_channel(btstack_packet_handler_t packet_handler, uint16_t channel_id) { 1562 switch(channel_id){ 1563 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1564 attribute_protocol_packet_handler = packet_handler; 1565 break; 1566 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1567 security_protocol_packet_handler = packet_handler; 1568 break; 1569 } 1570 } 1571 1572 #ifdef HAVE_BLE 1573 1574 // Request LE connection parameter update 1575 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){ 1576 if (!hci_can_send_acl_packet_now(handle)){ 1577 log_info("l2cap_send_signaling_packet, cannot send"); 1578 return BTSTACK_ACL_BUFFERS_FULL; 1579 } 1580 // log_info("l2cap_send_signaling_packet type %u", cmd); 1581 hci_reserve_packet_buffer(); 1582 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 1583 uint16_t len = l2cap_le_create_connection_parameter_update_request(acl_buffer, handle, interval_min, interval_max, slave_latency, timeout_multiplier); 1584 return hci_send_acl_packet_buffer(len); 1585 } 1586 #endif 1587 1588