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(void){ 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(void){ 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 // log_info("l2cap_run: entered"); 522 523 // check pending signaling responses 524 while (signaling_responses_pending){ 525 526 hci_con_handle_t handle = signaling_responses[0].handle; 527 528 if (!hci_can_send_acl_packet_now(handle)) break; 529 530 uint8_t sig_id = signaling_responses[0].sig_id; 531 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 532 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 533 uint8_t response_code = signaling_responses[0].code; 534 535 // remove first item before sending (to avoid sending response mutliple times) 536 signaling_responses_pending--; 537 int i; 538 for (i=0; i < signaling_responses_pending; i++){ 539 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 540 } 541 542 switch (response_code){ 543 case CONNECTION_REQUEST: 544 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 545 // also disconnect if result is 0x0003 - security blocked 546 if (result == 0x0003){ 547 hci_disconnect_security_block(handle); 548 } 549 break; 550 case ECHO_REQUEST: 551 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 552 break; 553 case INFORMATION_REQUEST: 554 switch (infoType){ 555 case 1: { // Connectionless MTU 556 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 557 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 558 break; 559 } 560 case 2: { // Extended Features Supported 561 // extended features request supported, features: fixed channels, unicast connectionless data reception 562 uint32_t features = 0x280; 563 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 564 break; 565 } 566 case 3: { // Fixed Channels Supported 567 uint8_t map[8]; 568 memset(map, 0, 8); 569 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 570 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 571 break; 572 } 573 default: 574 // all other types are not supported 575 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 576 break; 577 } 578 break; 579 case COMMAND_REJECT: 580 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 581 #ifdef HAVE_BLE 582 case COMMAND_REJECT_LE: 583 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 584 break; 585 #endif 586 default: 587 // should not happen 588 break; 589 } 590 } 591 592 uint8_t config_options[4]; 593 linked_list_iterator_t it; 594 linked_list_iterator_init(&it, &l2cap_channels); 595 while (linked_list_iterator_has_next(&it)){ 596 597 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 598 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 599 switch (channel->state){ 600 601 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 602 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 603 if (!hci_can_send_acl_packet_now(channel->handle)) break; 604 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 605 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 606 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 607 } 608 break; 609 610 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 611 if (!hci_can_send_command_packet_now()) break; 612 // send connection request - set state first 613 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 614 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 615 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 616 break; 617 618 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 619 if (!hci_can_send_acl_packet_now(channel->handle)) break; 620 channel->state = L2CAP_STATE_INVALID; 621 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 622 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 623 l2cap_stop_rtx(channel); 624 linked_list_iterator_remove(&it); 625 btstack_memory_l2cap_channel_free(channel); 626 break; 627 628 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 629 if (!hci_can_send_acl_packet_now(channel->handle)) break; 630 channel->state = L2CAP_STATE_CONFIG; 631 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 632 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 633 break; 634 635 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 636 if (!hci_can_send_acl_packet_now(channel->handle)) break; 637 // success, start l2cap handshake 638 channel->local_sig_id = l2cap_next_sig_id(); 639 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 640 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 641 l2cap_start_rtx(channel); 642 break; 643 644 case L2CAP_STATE_CONFIG: 645 if (!hci_can_send_acl_packet_now(channel->handle)) break; 646 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 647 uint16_t flags = 0; 648 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 649 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 650 flags = 1; 651 } else { 652 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 653 } 654 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 655 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 656 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 657 config_options[0] = 1; // MTU 658 config_options[1] = 2; // len param 659 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 660 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 661 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 662 } else { 663 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 664 } 665 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 666 } 667 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 668 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 669 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 670 channel->local_sig_id = l2cap_next_sig_id(); 671 config_options[0] = 1; // MTU 672 config_options[1] = 2; // len param 673 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 674 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 675 l2cap_start_rtx(channel); 676 } 677 if (l2cap_channel_ready_for_open(channel)){ 678 channel->state = L2CAP_STATE_OPEN; 679 l2cap_emit_channel_opened(channel, 0); // success 680 l2cap_emit_credits(channel, 1); 681 } 682 break; 683 684 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 685 if (!hci_can_send_acl_packet_now(channel->handle)) break; 686 channel->state = L2CAP_STATE_INVALID; 687 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 688 // 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 :) 689 l2cap_finialize_channel_close(channel); // -- remove from list 690 break; 691 692 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 693 if (!hci_can_send_acl_packet_now(channel->handle)) break; 694 channel->local_sig_id = l2cap_next_sig_id(); 695 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 696 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 697 break; 698 default: 699 break; 700 } 701 } 702 703 #ifdef HAVE_BLE 704 // send l2cap con paramter update if necessary 705 hci_connections_get_iterator(&it); 706 while(linked_list_iterator_has_next(&it)){ 707 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 708 int result; 709 710 switch (connection->le_con_parameter_update_state){ 711 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 712 result = 0; 713 break; 714 case CON_PARAMETER_UPDATE_DENY: 715 result = 1; 716 break; 717 default: 718 result = -1; 719 break; 720 } 721 if (result < 0) break; 722 723 if (!hci_can_send_acl_packet_now(connection->con_handle)) break; 724 hci_reserve_packet_buffer(); 725 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 726 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 727 uint16_t len = l2cap_le_create_connection_parameter_update_response(acl_buffer, connection->con_handle, 0); 728 hci_send_acl_packet_buffer(len); 729 } 730 #endif 731 732 // log_info("l2cap_run: exit"); 733 } 734 735 uint16_t l2cap_max_mtu(void){ 736 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 737 } 738 739 uint16_t l2cap_max_le_mtu(void){ 740 return l2cap_max_mtu(); 741 } 742 743 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 744 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 745 log_info("l2cap_handle_connection_complete expected state"); 746 // success, start l2cap handshake 747 channel->handle = handle; 748 channel->local_cid = l2cap_next_local_cid(); 749 // check remote SSP feature first 750 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 751 } 752 } 753 754 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 755 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 756 757 // we have been waiting for remote supported features, if both support SSP, 758 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)); 759 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 760 // request security level 2 761 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 762 gap_request_security_level(channel->handle, LEVEL_2); 763 return; 764 } 765 // fine, go ahead 766 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 767 } 768 769 // open outgoing L2CAP channel 770 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t packet_handler, 771 bd_addr_t address, uint16_t psm, uint16_t mtu){ 772 773 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 774 775 // alloc structure 776 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 777 if (!chan) { 778 // emit error event 779 l2cap_channel_t dummy_channel; 780 BD_ADDR_COPY(dummy_channel.address, address); 781 dummy_channel.psm = psm; 782 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 783 return; 784 } 785 // Init memory (make valgrind happy) 786 memset(chan, 0, sizeof(l2cap_channel_t)); 787 // limit local mtu to max acl packet length - l2cap header 788 if (mtu > l2cap_max_mtu()) { 789 mtu = l2cap_max_mtu(); 790 } 791 792 // fill in 793 BD_ADDR_COPY(chan->address, address); 794 chan->psm = psm; 795 chan->handle = 0; 796 chan->connection = connection; 797 chan->packet_handler = packet_handler; 798 chan->remote_mtu = L2CAP_MINIMAL_MTU; 799 chan->local_mtu = mtu; 800 chan->packets_granted = 0; 801 802 // set initial state 803 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 804 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 805 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 806 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 807 chan->required_security_level = LEVEL_0; 808 809 // add to connections list 810 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 811 812 // check if hci connection is already usable 813 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 814 if (conn){ 815 log_info("l2cap_create_channel_internal, hci connection already exists"); 816 l2cap_handle_connection_complete(conn->con_handle, chan); 817 // check if remote supported fearures are already received 818 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 819 l2cap_handle_remote_supported_features_received(chan); 820 } 821 } 822 823 l2cap_run(); 824 } 825 826 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 827 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 828 // find channel for local_cid 829 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 830 if (channel) { 831 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 832 } 833 // process 834 l2cap_run(); 835 } 836 837 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 838 linked_list_iterator_t it; 839 linked_list_iterator_init(&it, &l2cap_channels); 840 while (linked_list_iterator_has_next(&it)){ 841 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 842 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 843 // channel for this address found 844 switch (channel->state){ 845 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 846 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 847 // failure, forward error code 848 l2cap_emit_channel_opened(channel, status); 849 // discard channel 850 l2cap_stop_rtx(channel); 851 linked_list_iterator_remove(&it); 852 btstack_memory_l2cap_channel_free(channel); 853 break; 854 default: 855 break; 856 } 857 } 858 } 859 860 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 861 linked_list_iterator_t it; 862 linked_list_iterator_init(&it, &l2cap_channels); 863 while (linked_list_iterator_has_next(&it)){ 864 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 865 if ( ! BD_ADDR_CMP( channel->address, address) ){ 866 l2cap_handle_connection_complete(handle, channel); 867 } 868 } 869 // process 870 l2cap_run(); 871 } 872 873 void l2cap_event_handler(uint8_t *packet, uint16_t size){ 874 875 bd_addr_t address; 876 hci_con_handle_t handle; 877 linked_list_iterator_t it; 878 int hci_con_used; 879 880 switch(packet[0]){ 881 882 // handle connection complete events 883 case HCI_EVENT_CONNECTION_COMPLETE: 884 bt_flip_addr(address, &packet[5]); 885 if (packet[2] == 0){ 886 handle = READ_BT_16(packet, 3); 887 l2cap_handle_connection_success_for_addr(address, handle); 888 } else { 889 l2cap_handle_connection_failed_for_addr(address, packet[2]); 890 } 891 break; 892 893 // handle successful create connection cancel command 894 case HCI_EVENT_COMMAND_COMPLETE: 895 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 896 if (packet[5] == 0){ 897 bt_flip_addr(address, &packet[6]); 898 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 899 l2cap_handle_connection_failed_for_addr(address, 0x16); 900 } 901 } 902 l2cap_run(); // try sending signaling packets first 903 break; 904 905 case HCI_EVENT_COMMAND_STATUS: 906 l2cap_run(); // try sending signaling packets first 907 break; 908 909 // handle disconnection complete events 910 case HCI_EVENT_DISCONNECTION_COMPLETE: 911 // send l2cap disconnect events for all channels on this handle and free them 912 handle = READ_BT_16(packet, 3); 913 linked_list_iterator_init(&it, &l2cap_channels); 914 while (linked_list_iterator_has_next(&it)){ 915 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 916 if (channel->handle != handle) continue; 917 l2cap_emit_channel_closed(channel); 918 l2cap_stop_rtx(channel); 919 linked_list_iterator_remove(&it); 920 btstack_memory_l2cap_channel_free(channel); 921 } 922 break; 923 924 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 925 l2cap_run(); // try sending signaling packets first 926 l2cap_hand_out_credits(); 927 break; 928 929 // HCI Connection Timeouts 930 case L2CAP_EVENT_TIMEOUT_CHECK: 931 handle = READ_BT_16(packet, 2); 932 if (hci_authentication_active_for_handle(handle)) break; 933 hci_con_used = 0; 934 linked_list_iterator_init(&it, &l2cap_channels); 935 while (linked_list_iterator_has_next(&it)){ 936 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 937 if (channel->handle != handle) continue; 938 hci_con_used = 1; 939 break; 940 } 941 if (hci_con_used) break; 942 if (!hci_can_send_command_packet_now()) break; 943 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 944 break; 945 946 case DAEMON_EVENT_HCI_PACKET_SENT: 947 linked_list_iterator_init(&it, &l2cap_channels); 948 while (linked_list_iterator_has_next(&it)){ 949 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 950 if (!channel->packet_handler) continue; 951 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 952 } 953 if (attribute_protocol_packet_handler) { 954 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 955 } 956 if (security_protocol_packet_handler) { 957 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 958 } 959 if (connectionless_channel_packet_handler) { 960 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 961 } 962 break; 963 964 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 965 handle = READ_BT_16(packet, 3); 966 linked_list_iterator_init(&it, &l2cap_channels); 967 while (linked_list_iterator_has_next(&it)){ 968 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 969 if (channel->handle != handle) continue; 970 l2cap_handle_remote_supported_features_received(channel); 971 break; 972 } 973 break; 974 975 case GAP_SECURITY_LEVEL: 976 handle = READ_BT_16(packet, 2); 977 log_info("l2cap - security level update"); 978 linked_list_iterator_init(&it, &l2cap_channels); 979 while (linked_list_iterator_has_next(&it)){ 980 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 981 if (channel->handle != handle) continue; 982 983 log_info("l2cap - state %u", channel->state); 984 985 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 986 gap_security_level_t required_level = channel->required_security_level; 987 988 switch (channel->state){ 989 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 990 if (actual_level >= required_level){ 991 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 992 l2cap_emit_connection_request(channel); 993 } else { 994 channel->reason = 0x0003; // security block 995 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 996 } 997 break; 998 999 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1000 if (actual_level >= required_level){ 1001 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1002 } else { 1003 // disconnnect, authentication not good enough 1004 hci_disconnect_security_block(handle); 1005 } 1006 break; 1007 1008 default: 1009 break; 1010 } 1011 } 1012 break; 1013 1014 default: 1015 break; 1016 } 1017 1018 // pass on: main packet handler, att and sm packet handlers 1019 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1020 if (attribute_protocol_packet_handler){ 1021 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1022 } 1023 if (security_protocol_packet_handler) { 1024 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1025 } 1026 if (connectionless_channel_packet_handler) { 1027 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1028 } 1029 1030 l2cap_run(); 1031 } 1032 1033 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1034 channel->remote_sig_id = identifier; 1035 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1036 l2cap_run(); 1037 } 1038 1039 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1040 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1041 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1042 signaling_responses[signaling_responses_pending].handle = handle; 1043 signaling_responses[signaling_responses_pending].code = code; 1044 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1045 signaling_responses[signaling_responses_pending].data = data; 1046 signaling_responses_pending++; 1047 l2cap_run(); 1048 } 1049 } 1050 1051 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1052 1053 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1054 l2cap_service_t *service = l2cap_get_service(psm); 1055 if (!service) { 1056 // 0x0002 PSM not supported 1057 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1058 return; 1059 } 1060 1061 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1062 if (!hci_connection) { 1063 // 1064 log_error("no hci_connection for handle %u", handle); 1065 return; 1066 } 1067 1068 // alloc structure 1069 // log_info("l2cap_handle_connection_request register channel"); 1070 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1071 if (!channel){ 1072 // 0x0004 No resources available 1073 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1074 return; 1075 } 1076 // Init memory (make valgrind happy) 1077 memset(channel, 0, sizeof(l2cap_channel_t)); 1078 // fill in 1079 BD_ADDR_COPY(channel->address, hci_connection->address); 1080 channel->psm = psm; 1081 channel->handle = handle; 1082 channel->connection = service->connection; 1083 channel->packet_handler = service->packet_handler; 1084 channel->local_cid = l2cap_next_local_cid(); 1085 channel->remote_cid = source_cid; 1086 channel->local_mtu = service->mtu; 1087 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1088 channel->packets_granted = 0; 1089 channel->remote_sig_id = sig_id; 1090 channel->required_security_level = service->required_security_level; 1091 1092 // limit local mtu to max acl packet length - l2cap header 1093 if (channel->local_mtu > l2cap_max_mtu()) { 1094 channel->local_mtu = l2cap_max_mtu(); 1095 } 1096 1097 // set initial state 1098 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1099 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1100 1101 // add to connections list 1102 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1103 1104 // assert security requirements 1105 gap_request_security_level(handle, channel->required_security_level); 1106 } 1107 1108 void l2cap_accept_connection_internal(uint16_t local_cid){ 1109 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1110 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1111 if (!channel) { 1112 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1113 return; 1114 } 1115 1116 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1117 1118 // process 1119 l2cap_run(); 1120 } 1121 1122 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1123 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1124 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1125 if (!channel) { 1126 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1127 return; 1128 } 1129 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1130 channel->reason = reason; 1131 l2cap_run(); 1132 } 1133 1134 void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1135 1136 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1137 1138 uint16_t flags = READ_BT_16(command, 6); 1139 if (flags & 1) { 1140 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1141 } 1142 1143 // accept the other's configuration options 1144 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1145 uint16_t pos = 8; 1146 while (pos < end_pos){ 1147 uint8_t option_hint = command[pos] >> 7; 1148 uint8_t option_type = command[pos] & 0x7f; 1149 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1150 pos++; 1151 uint8_t length = command[pos++]; 1152 // MTU { type(8): 1, len(8):2, MTU(16) } 1153 if (option_type == 1 && length == 2){ 1154 channel->remote_mtu = READ_BT_16(command, pos); 1155 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1156 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1157 } 1158 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1159 if (option_type == 2 && length == 2){ 1160 channel->flush_timeout = READ_BT_16(command, pos); 1161 } 1162 // check for unknown options 1163 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1164 log_info("l2cap cid %u, unknown options", channel->local_cid); 1165 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1166 } 1167 pos += length; 1168 } 1169 } 1170 1171 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1172 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1173 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1174 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1175 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1176 if (channel->state == L2CAP_STATE_OPEN) return 0; 1177 return 1; 1178 } 1179 1180 1181 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1182 1183 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1184 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1185 uint16_t result = 0; 1186 1187 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1188 1189 // handle DISCONNECT REQUESTS seperately 1190 if (code == DISCONNECTION_REQUEST){ 1191 switch (channel->state){ 1192 case L2CAP_STATE_CONFIG: 1193 case L2CAP_STATE_OPEN: 1194 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1195 case L2CAP_STATE_WAIT_DISCONNECT: 1196 l2cap_handle_disconnect_request(channel, identifier); 1197 break; 1198 1199 default: 1200 // ignore in other states 1201 break; 1202 } 1203 return; 1204 } 1205 1206 // @STATEMACHINE(l2cap) 1207 switch (channel->state) { 1208 1209 case L2CAP_STATE_WAIT_CONNECT_RSP: 1210 switch (code){ 1211 case CONNECTION_RESPONSE: 1212 l2cap_stop_rtx(channel); 1213 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1214 switch (result) { 1215 case 0: 1216 // successful connection 1217 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1218 channel->state = L2CAP_STATE_CONFIG; 1219 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1220 break; 1221 case 1: 1222 // connection pending. get some coffee, but start the ERTX 1223 l2cap_start_ertx(channel); 1224 break; 1225 default: 1226 // channel closed 1227 channel->state = L2CAP_STATE_CLOSED; 1228 // map l2cap connection response result to BTstack status enumeration 1229 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1230 1231 // drop link key if security block 1232 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1233 hci_drop_link_key_for_bd_addr(channel->address); 1234 } 1235 1236 // discard channel 1237 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1238 btstack_memory_l2cap_channel_free(channel); 1239 break; 1240 } 1241 break; 1242 1243 default: 1244 //@TODO: implement other signaling packets 1245 break; 1246 } 1247 break; 1248 1249 case L2CAP_STATE_CONFIG: 1250 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1251 switch (code) { 1252 case CONFIGURE_REQUEST: 1253 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1254 l2cap_signaling_handle_configure_request(channel, command); 1255 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1256 // only done if continuation not set 1257 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1258 } 1259 break; 1260 case CONFIGURE_RESPONSE: 1261 l2cap_stop_rtx(channel); 1262 switch (result){ 1263 case 0: // success 1264 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1265 break; 1266 case 4: // pending 1267 l2cap_start_ertx(channel); 1268 break; 1269 default: 1270 // retry on negative result 1271 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1272 break; 1273 } 1274 break; 1275 default: 1276 break; 1277 } 1278 if (l2cap_channel_ready_for_open(channel)){ 1279 // for open: 1280 channel->state = L2CAP_STATE_OPEN; 1281 l2cap_emit_channel_opened(channel, 0); 1282 l2cap_emit_credits(channel, 1); 1283 } 1284 break; 1285 1286 case L2CAP_STATE_WAIT_DISCONNECT: 1287 switch (code) { 1288 case DISCONNECTION_RESPONSE: 1289 l2cap_finialize_channel_close(channel); 1290 break; 1291 default: 1292 //@TODO: implement other signaling packets 1293 break; 1294 } 1295 break; 1296 1297 case L2CAP_STATE_CLOSED: 1298 // @TODO handle incoming requests 1299 break; 1300 1301 case L2CAP_STATE_OPEN: 1302 //@TODO: implement other signaling packets, e.g. re-configure 1303 break; 1304 default: 1305 break; 1306 } 1307 // log_info("new state %u", channel->state); 1308 } 1309 1310 1311 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1312 1313 // get code, signalind identifier and command len 1314 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1315 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1316 1317 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1318 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1319 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1320 return; 1321 } 1322 1323 // general commands without an assigned channel 1324 switch(code) { 1325 1326 case CONNECTION_REQUEST: { 1327 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1328 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1329 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1330 return; 1331 } 1332 1333 case ECHO_REQUEST: 1334 l2cap_register_signaling_response(handle, code, sig_id, 0); 1335 return; 1336 1337 case INFORMATION_REQUEST: { 1338 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1339 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1340 return; 1341 } 1342 1343 default: 1344 break; 1345 } 1346 1347 1348 // Get potential destination CID 1349 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1350 1351 // Find channel for this sig_id and connection handle 1352 linked_list_iterator_t it; 1353 linked_list_iterator_init(&it, &l2cap_channels); 1354 while (linked_list_iterator_has_next(&it)){ 1355 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1356 if (channel->handle != handle) continue; 1357 if (code & 1) { 1358 // match odd commands (responses) by previous signaling identifier 1359 if (channel->local_sig_id == sig_id) { 1360 l2cap_signaling_handler_channel(channel, command); 1361 break; 1362 } 1363 } else { 1364 // match even commands (requests) by local channel id 1365 if (channel->local_cid == dest_cid) { 1366 l2cap_signaling_handler_channel(channel, command); 1367 break; 1368 } 1369 } 1370 } 1371 } 1372 1373 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1374 1375 // Get Channel ID 1376 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1377 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1378 1379 switch (channel_id) { 1380 1381 case L2CAP_CID_SIGNALING: { 1382 1383 uint16_t command_offset = 8; 1384 while (command_offset < size) { 1385 1386 // handle signaling commands 1387 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1388 1389 // increment command_offset 1390 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1391 } 1392 break; 1393 } 1394 1395 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1396 if (attribute_protocol_packet_handler) { 1397 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1398 } 1399 break; 1400 1401 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1402 if (security_protocol_packet_handler) { 1403 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1404 } 1405 break; 1406 1407 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1408 if (connectionless_channel_packet_handler) { 1409 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1410 } 1411 break; 1412 1413 case L2CAP_CID_SIGNALING_LE: { 1414 switch (packet[8]){ 1415 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1416 uint16_t result = READ_BT_16(packet, 12); 1417 l2cap_emit_connection_parameter_update_response(handle, result); 1418 break; 1419 } 1420 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1421 uint8_t event[10]; 1422 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1423 event[1] = 8; 1424 memcpy(&event[2], &packet[12], 8); 1425 1426 hci_connection_t * connection = hci_connection_for_handle(handle); 1427 if (connection){ 1428 int update_parameter = 1; 1429 le_connection_parameter_range_t existing_range = gap_le_get_connection_parameter_range(); 1430 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1431 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1432 uint16_t le_conn_latency = READ_BT_16(packet,16); 1433 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1434 1435 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1436 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1437 1438 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1439 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1440 1441 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1442 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1443 1444 if (update_parameter){ 1445 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1446 connection->le_conn_interval_min = le_conn_interval_min; 1447 connection->le_conn_interval_max = le_conn_interval_max; 1448 connection->le_conn_latency = le_conn_latency; 1449 connection->le_supervision_timeout = le_supervision_timeout; 1450 } else { 1451 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1452 } 1453 } 1454 1455 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1456 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1457 1458 break; 1459 } 1460 default: { 1461 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1462 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1463 break; 1464 } 1465 } 1466 break; 1467 } 1468 1469 default: { 1470 // Find channel for this channel_id and connection handle 1471 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1472 if (channel) { 1473 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1474 } 1475 break; 1476 } 1477 } 1478 } 1479 1480 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1481 switch (packet_type) { 1482 case HCI_EVENT_PACKET: 1483 l2cap_event_handler(packet, size); 1484 break; 1485 case HCI_ACL_DATA_PACKET: 1486 l2cap_acl_handler(packet, size); 1487 break; 1488 default: 1489 break; 1490 } 1491 l2cap_run(); 1492 } 1493 1494 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1495 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1496 channel->state = L2CAP_STATE_CLOSED; 1497 l2cap_emit_channel_closed(channel); 1498 // discard channel 1499 l2cap_stop_rtx(channel); 1500 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1501 btstack_memory_l2cap_channel_free(channel); 1502 } 1503 1504 l2cap_service_t * l2cap_get_service(uint16_t psm){ 1505 linked_list_iterator_t it; 1506 linked_list_iterator_init(&it, &l2cap_services); 1507 while (linked_list_iterator_has_next(&it)){ 1508 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1509 if ( service->psm == psm){ 1510 return service; 1511 }; 1512 } 1513 return NULL; 1514 } 1515 1516 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){ 1517 1518 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1519 1520 // check for alread registered psm 1521 // TODO: emit error event 1522 l2cap_service_t *service = l2cap_get_service(psm); 1523 if (service) { 1524 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1525 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1526 return; 1527 } 1528 1529 // alloc structure 1530 // TODO: emit error event 1531 service = btstack_memory_l2cap_service_get(); 1532 if (!service) { 1533 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1534 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1535 return; 1536 } 1537 1538 // fill in 1539 service->psm = psm; 1540 service->mtu = mtu; 1541 service->connection = connection; 1542 service->packet_handler = packet_handler; 1543 service->required_security_level = security_level; 1544 1545 // add to services list 1546 linked_list_add(&l2cap_services, (linked_item_t *) service); 1547 1548 // enable page scan 1549 hci_connectable_control(1); 1550 1551 // done 1552 l2cap_emit_service_registered(connection, 0, psm); 1553 } 1554 1555 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1556 1557 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1558 1559 l2cap_service_t *service = l2cap_get_service(psm); 1560 if (!service) return; 1561 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1562 btstack_memory_l2cap_service_free(service); 1563 1564 // disable page scan when no services registered 1565 if (!linked_list_empty(&l2cap_services)) return; 1566 hci_connectable_control(0); 1567 } 1568 1569 1570 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1571 void l2cap_register_fixed_channel(btstack_packet_handler_t packet_handler, uint16_t channel_id) { 1572 switch(channel_id){ 1573 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1574 attribute_protocol_packet_handler = packet_handler; 1575 break; 1576 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1577 security_protocol_packet_handler = packet_handler; 1578 break; 1579 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1580 connectionless_channel_packet_handler = packet_handler; 1581 break; 1582 } 1583 } 1584 1585 #ifdef HAVE_BLE 1586 1587 // Request LE connection parameter update 1588 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){ 1589 if (!hci_can_send_acl_packet_now(handle)){ 1590 log_info("l2cap_send_signaling_packet, cannot send"); 1591 return BTSTACK_ACL_BUFFERS_FULL; 1592 } 1593 // log_info("l2cap_send_signaling_packet type %u", cmd); 1594 hci_reserve_packet_buffer(); 1595 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 1596 uint16_t len = l2cap_le_create_connection_parameter_update_request(acl_buffer, handle, interval_min, interval_max, slave_latency, timeout_multiplier); 1597 return hci_send_acl_packet_buffer(len); 1598 } 1599 #endif 1600 1601