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