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(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 linked_list_t l2cap_le_channels; 79 static linked_list_t l2cap_le_services; 80 static void (*packet_handler) (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 81 82 static btstack_packet_handler_t attribute_protocol_packet_handler; 83 static btstack_packet_handler_t security_protocol_packet_handler; 84 static btstack_packet_handler_t connectionless_channel_packet_handler; 85 static uint8_t require_security_level2_for_outgoing_sdp; 86 87 // prototypes 88 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 89 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 90 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 91 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 92 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 93 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 94 95 96 void l2cap_init(void){ 97 signaling_responses_pending = 0; 98 99 l2cap_channels = NULL; 100 l2cap_services = NULL; 101 l2cap_le_services = NULL; 102 l2cap_le_channels = NULL; 103 104 packet_handler = null_packet_handler; 105 attribute_protocol_packet_handler = NULL; 106 security_protocol_packet_handler = NULL; 107 connectionless_channel_packet_handler = NULL; 108 109 require_security_level2_for_outgoing_sdp = 0; 110 111 // 112 // register callback with HCI 113 // 114 hci_register_packet_handler(&l2cap_packet_handler); 115 hci_connectable_control(0); // no services yet 116 } 117 118 119 /** Register L2CAP packet handlers */ 120 static void null_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 121 } 122 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 123 packet_handler = handler; 124 } 125 126 // notify client/protocol handler 127 static void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 128 if (channel->packet_handler) { 129 (* (channel->packet_handler))(type, channel->local_cid, data, size); 130 } else { 131 (*packet_handler)(type, channel->local_cid, data, size); 132 } 133 } 134 135 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 136 log_info("L2CAP_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x local_mtu %u, remote_mtu %u, flush_timeout %u", 137 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 138 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 139 uint8_t event[23]; 140 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 141 event[1] = sizeof(event) - 2; 142 event[2] = status; 143 bt_flip_addr(&event[3], channel->address); 144 bt_store_16(event, 9, channel->handle); 145 bt_store_16(event, 11, channel->psm); 146 bt_store_16(event, 13, channel->local_cid); 147 bt_store_16(event, 15, channel->remote_cid); 148 bt_store_16(event, 17, channel->local_mtu); 149 bt_store_16(event, 19, channel->remote_mtu); 150 bt_store_16(event, 21, channel->flush_timeout); 151 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 152 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 153 } 154 155 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 156 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 157 uint8_t event[4]; 158 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 159 event[1] = sizeof(event) - 2; 160 bt_store_16(event, 2, channel->local_cid); 161 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 162 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 163 } 164 165 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 166 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 167 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 168 uint8_t event[16]; 169 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 170 event[1] = sizeof(event) - 2; 171 bt_flip_addr(&event[2], channel->address); 172 bt_store_16(event, 8, channel->handle); 173 bt_store_16(event, 10, channel->psm); 174 bt_store_16(event, 12, channel->local_cid); 175 bt_store_16(event, 14, channel->remote_cid); 176 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 177 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 178 } 179 180 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 181 uint8_t event[6]; 182 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 183 event[1] = 4; 184 bt_store_16(event, 2, handle); 185 bt_store_16(event, 4, result); 186 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 187 (*packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 } 189 190 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 191 192 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 193 194 uint8_t event[5]; 195 event[0] = L2CAP_EVENT_CREDITS; 196 event[1] = sizeof(event) - 2; 197 bt_store_16(event, 2, channel->local_cid); 198 event[4] = credits; 199 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 200 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 201 } 202 203 static void l2cap_hand_out_credits(void){ 204 linked_list_iterator_t it; 205 linked_list_iterator_init(&it, &l2cap_channels); 206 while (linked_list_iterator_has_next(&it)){ 207 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 208 if (channel->state != L2CAP_STATE_OPEN) continue; 209 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 210 l2cap_emit_credits(channel, 1); 211 } 212 } 213 214 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 215 linked_list_iterator_t it; 216 linked_list_iterator_init(&it, &l2cap_channels); 217 while (linked_list_iterator_has_next(&it)){ 218 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 219 if ( channel->local_cid == local_cid) { 220 return channel; 221 } 222 } 223 return NULL; 224 } 225 226 int l2cap_can_send_packet_now(uint16_t local_cid){ 227 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 228 if (!channel) return 0; 229 return hci_can_send_acl_packet_now(channel->handle); 230 } 231 232 // @deprecated 233 int l2cap_can_send_connectionless_packet_now(void){ 234 // TODO provide real handle 235 return l2cap_can_send_fixed_channel_packet_now(0x1234); 236 } 237 238 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 239 return hci_can_send_acl_packet_now(handle); 240 } 241 242 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 243 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 244 if (channel) { 245 return channel->remote_mtu; 246 } 247 return 0; 248 } 249 250 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 251 linked_list_iterator_t it; 252 linked_list_iterator_init(&it, &l2cap_channels); 253 while (linked_list_iterator_has_next(&it)){ 254 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 255 if ( &channel->rtx == ts) { 256 return channel; 257 } 258 } 259 return NULL; 260 } 261 262 static void l2cap_rtx_timeout(timer_source_t * ts){ 263 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 264 if (!ts) return; 265 266 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 267 268 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 269 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 270 // notify client 271 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 272 273 // discard channel 274 // no need to stop timer here, it is removed from list during timer callback 275 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 276 btstack_memory_l2cap_channel_free(channel); 277 } 278 279 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 280 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 281 run_loop_remove_timer(&channel->rtx); 282 } 283 284 static void l2cap_start_rtx(l2cap_channel_t * channel){ 285 l2cap_stop_rtx(channel); 286 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 287 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 288 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 289 run_loop_add_timer(&channel->rtx); 290 } 291 292 static void l2cap_start_ertx(l2cap_channel_t * channel){ 293 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 294 l2cap_stop_rtx(channel); 295 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 296 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 297 run_loop_add_timer(&channel->rtx); 298 } 299 300 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 301 require_security_level2_for_outgoing_sdp = 1; 302 } 303 304 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 305 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 306 } 307 308 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 309 310 if (!hci_can_send_acl_packet_now(handle)){ 311 log_info("l2cap_send_signaling_packet, cannot send"); 312 return BTSTACK_ACL_BUFFERS_FULL; 313 } 314 315 // log_info("l2cap_send_signaling_packet type %u", cmd); 316 hci_reserve_packet_buffer(); 317 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 318 va_list argptr; 319 va_start(argptr, identifier); 320 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 321 va_end(argptr); 322 // log_info("l2cap_send_signaling_packet con %u!", handle); 323 return hci_send_acl_packet_buffer(len); 324 } 325 326 #ifdef HAVE_BLE 327 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 328 329 if (!hci_can_send_acl_packet_now(handle)){ 330 log_info("l2cap_send_signaling_packet, cannot send"); 331 return BTSTACK_ACL_BUFFERS_FULL; 332 } 333 334 // log_info("l2cap_send_signaling_packet type %u", cmd); 335 hci_reserve_packet_buffer(); 336 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 337 va_list argptr; 338 va_start(argptr, identifier); 339 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 340 va_end(argptr); 341 // log_info("l2cap_send_signaling_packet con %u!", handle); 342 return hci_send_acl_packet_buffer(len); 343 } 344 #endif 345 346 uint8_t *l2cap_get_outgoing_buffer(void){ 347 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 348 } 349 350 int l2cap_reserve_packet_buffer(void){ 351 return hci_reserve_packet_buffer(); 352 } 353 354 void l2cap_release_packet_buffer(void){ 355 hci_release_packet_buffer(); 356 } 357 358 359 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 360 361 if (!hci_is_packet_buffer_reserved()){ 362 log_error("l2cap_send_prepared called without reserving packet first"); 363 return BTSTACK_ACL_BUFFERS_FULL; 364 } 365 366 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 367 if (!channel) { 368 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 369 return -1; // TODO: define error 370 } 371 372 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 373 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 374 return BTSTACK_ACL_BUFFERS_FULL; 375 } 376 377 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 378 379 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 380 381 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 382 383 // 0 - Connection handle : PB=pb : BC=00 384 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 385 // 2 - ACL length 386 bt_store_16(acl_buffer, 2, len + 4); 387 // 4 - L2CAP packet length 388 bt_store_16(acl_buffer, 4, len + 0); 389 // 6 - L2CAP channel DEST 390 bt_store_16(acl_buffer, 6, channel->remote_cid); 391 // send 392 int err = hci_send_acl_packet_buffer(len+8); 393 394 l2cap_hand_out_credits(); 395 396 return err; 397 } 398 399 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 400 401 if (!hci_is_packet_buffer_reserved()){ 402 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 403 return BTSTACK_ACL_BUFFERS_FULL; 404 } 405 406 if (!hci_can_send_prepared_acl_packet_now(handle)){ 407 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 408 return BTSTACK_ACL_BUFFERS_FULL; 409 } 410 411 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 412 413 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 414 415 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 416 417 // 0 - Connection handle : PB=pb : BC=00 418 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 419 // 2 - ACL length 420 bt_store_16(acl_buffer, 2, len + 4); 421 // 4 - L2CAP packet length 422 bt_store_16(acl_buffer, 4, len + 0); 423 // 6 - L2CAP channel DEST 424 bt_store_16(acl_buffer, 6, cid); 425 // send 426 int err = hci_send_acl_packet_buffer(len+8); 427 428 l2cap_hand_out_credits(); 429 430 return err; 431 } 432 433 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 434 435 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 436 if (!channel) { 437 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 438 return -1; // TODO: define error 439 } 440 441 if (len > channel->remote_mtu){ 442 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 443 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 444 } 445 446 if (!hci_can_send_acl_packet_now(channel->handle)){ 447 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 448 return BTSTACK_ACL_BUFFERS_FULL; 449 } 450 451 hci_reserve_packet_buffer(); 452 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 453 454 memcpy(&acl_buffer[8], data, len); 455 456 return l2cap_send_prepared(local_cid, len); 457 } 458 459 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 460 461 if (!hci_can_send_acl_packet_now(handle)){ 462 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 463 return BTSTACK_ACL_BUFFERS_FULL; 464 } 465 466 hci_reserve_packet_buffer(); 467 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 468 469 memcpy(&acl_buffer[8], data, len); 470 471 return l2cap_send_prepared_connectionless(handle, cid, len); 472 } 473 474 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 475 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 476 } 477 478 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 479 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 480 } 481 482 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 483 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 484 } 485 486 487 488 // MARK: L2CAP_RUN 489 // process outstanding signaling tasks 490 static void l2cap_run(void){ 491 492 // log_info("l2cap_run: entered"); 493 494 // check pending signaling responses 495 while (signaling_responses_pending){ 496 497 hci_con_handle_t handle = signaling_responses[0].handle; 498 499 if (!hci_can_send_acl_packet_now(handle)) break; 500 501 uint8_t sig_id = signaling_responses[0].sig_id; 502 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 503 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 504 uint8_t response_code = signaling_responses[0].code; 505 506 // remove first item before sending (to avoid sending response mutliple times) 507 signaling_responses_pending--; 508 int i; 509 for (i=0; i < signaling_responses_pending; i++){ 510 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 511 } 512 513 switch (response_code){ 514 case CONNECTION_REQUEST: 515 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 516 // also disconnect if result is 0x0003 - security blocked 517 if (result == 0x0003){ 518 hci_disconnect_security_block(handle); 519 } 520 break; 521 case ECHO_REQUEST: 522 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 523 break; 524 case INFORMATION_REQUEST: 525 switch (infoType){ 526 case 1: { // Connectionless MTU 527 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 528 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 529 break; 530 } 531 case 2: { // Extended Features Supported 532 // extended features request supported, features: fixed channels, unicast connectionless data reception 533 uint32_t features = 0x280; 534 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 535 break; 536 } 537 case 3: { // Fixed Channels Supported 538 uint8_t map[8]; 539 memset(map, 0, 8); 540 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 541 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 542 break; 543 } 544 default: 545 // all other types are not supported 546 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 547 break; 548 } 549 break; 550 case COMMAND_REJECT: 551 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 552 #ifdef HAVE_BLE 553 case COMMAND_REJECT_LE: 554 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 555 break; 556 #endif 557 default: 558 // should not happen 559 break; 560 } 561 } 562 563 uint8_t config_options[4]; 564 linked_list_iterator_t it; 565 linked_list_iterator_init(&it, &l2cap_channels); 566 while (linked_list_iterator_has_next(&it)){ 567 568 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 569 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 570 switch (channel->state){ 571 572 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 573 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 574 if (!hci_can_send_acl_packet_now(channel->handle)) break; 575 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 576 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 577 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 578 } 579 break; 580 581 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 582 if (!hci_can_send_command_packet_now()) break; 583 // send connection request - set state first 584 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 585 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 586 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 587 break; 588 589 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 590 if (!hci_can_send_acl_packet_now(channel->handle)) break; 591 channel->state = L2CAP_STATE_INVALID; 592 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 593 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 594 l2cap_stop_rtx(channel); 595 linked_list_iterator_remove(&it); 596 btstack_memory_l2cap_channel_free(channel); 597 break; 598 599 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 600 if (!hci_can_send_acl_packet_now(channel->handle)) break; 601 channel->state = L2CAP_STATE_CONFIG; 602 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 603 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 604 break; 605 606 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 607 if (!hci_can_send_acl_packet_now(channel->handle)) break; 608 // success, start l2cap handshake 609 channel->local_sig_id = l2cap_next_sig_id(); 610 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 611 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 612 l2cap_start_rtx(channel); 613 break; 614 615 case L2CAP_STATE_CONFIG: 616 if (!hci_can_send_acl_packet_now(channel->handle)) break; 617 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 618 uint16_t flags = 0; 619 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 620 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 621 flags = 1; 622 } else { 623 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 624 } 625 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 626 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 627 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 628 config_options[0] = 1; // MTU 629 config_options[1] = 2; // len param 630 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 631 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 632 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 633 } else { 634 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 635 } 636 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 637 } 638 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 639 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 640 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 641 channel->local_sig_id = l2cap_next_sig_id(); 642 config_options[0] = 1; // MTU 643 config_options[1] = 2; // len param 644 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 645 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 646 l2cap_start_rtx(channel); 647 } 648 if (l2cap_channel_ready_for_open(channel)){ 649 channel->state = L2CAP_STATE_OPEN; 650 l2cap_emit_channel_opened(channel, 0); // success 651 l2cap_emit_credits(channel, 1); 652 } 653 break; 654 655 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 656 if (!hci_can_send_acl_packet_now(channel->handle)) break; 657 channel->state = L2CAP_STATE_INVALID; 658 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 659 // 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 :) 660 l2cap_finialize_channel_close(channel); // -- remove from list 661 break; 662 663 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 664 if (!hci_can_send_acl_packet_now(channel->handle)) break; 665 channel->local_sig_id = l2cap_next_sig_id(); 666 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 667 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 668 break; 669 default: 670 break; 671 } 672 } 673 674 #ifdef HAVE_BLE 675 // send l2cap con paramter update if necessary 676 hci_connections_get_iterator(&it); 677 while(linked_list_iterator_has_next(&it)){ 678 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 679 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 680 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 681 switch (connection->le_con_parameter_update_state){ 682 case CON_PARAMETER_UPDATE_SEND_REQUEST: 683 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 684 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 685 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 686 break; 687 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 688 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 689 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 690 break; 691 case CON_PARAMETER_UPDATE_DENY: 692 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 693 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 694 break; 695 default: 696 break; 697 } 698 } 699 #endif 700 701 // log_info("l2cap_run: exit"); 702 } 703 704 uint16_t l2cap_max_mtu(void){ 705 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 706 } 707 708 uint16_t l2cap_max_le_mtu(void){ 709 return l2cap_max_mtu(); 710 } 711 712 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 713 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 714 log_info("l2cap_handle_connection_complete expected state"); 715 // success, start l2cap handshake 716 channel->handle = handle; 717 // check remote SSP feature first 718 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 719 } 720 } 721 722 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 723 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 724 725 // we have been waiting for remote supported features, if both support SSP, 726 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)); 727 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 728 // request security level 2 729 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 730 gap_request_security_level(channel->handle, LEVEL_2); 731 return; 732 } 733 // fine, go ahead 734 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 735 } 736 737 /** 738 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 739 * @param packet_handler 740 * @param address 741 * @param psm 742 * @param mtu 743 * @param local_cid 744 */ 745 uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t mtu, uint16_t * out_local_cid){ 746 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 747 748 // alloc structure 749 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 750 if (!chan) { 751 return BTSTACK_MEMORY_ALLOC_FAILED; 752 } 753 754 // Init memory (make valgrind happy) 755 memset(chan, 0, sizeof(l2cap_channel_t)); 756 // limit local mtu to max acl packet length - l2cap header 757 if (mtu > l2cap_max_mtu()) { 758 mtu = l2cap_max_mtu(); 759 } 760 761 // fill in 762 BD_ADDR_COPY(chan->address, address); 763 chan->psm = psm; 764 chan->handle = 0; 765 chan->packet_handler = channel_packet_handler; 766 chan->remote_mtu = L2CAP_MINIMAL_MTU; 767 chan->local_mtu = mtu; 768 chan->local_cid = l2cap_next_local_cid(); 769 770 // set initial state 771 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 772 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 773 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 774 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 775 chan->required_security_level = LEVEL_0; 776 777 // add to connections list 778 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 779 780 // store local_cid 781 if (out_local_cid){ 782 *out_local_cid = chan->local_cid; 783 } 784 785 // check if hci connection is already usable 786 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 787 if (conn){ 788 log_info("l2cap_create_channel_internal, hci connection already exists"); 789 l2cap_handle_connection_complete(conn->con_handle, chan); 790 // check if remote supported fearures are already received 791 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 792 l2cap_handle_remote_supported_features_received(chan); 793 } 794 } 795 796 l2cap_run(); 797 798 return 0; 799 } 800 801 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 802 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 803 // find channel for local_cid 804 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 805 if (channel) { 806 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 807 } 808 // process 809 l2cap_run(); 810 } 811 812 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 813 linked_list_iterator_t it; 814 linked_list_iterator_init(&it, &l2cap_channels); 815 while (linked_list_iterator_has_next(&it)){ 816 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 817 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 818 // channel for this address found 819 switch (channel->state){ 820 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 821 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 822 // failure, forward error code 823 l2cap_emit_channel_opened(channel, status); 824 // discard channel 825 l2cap_stop_rtx(channel); 826 linked_list_iterator_remove(&it); 827 btstack_memory_l2cap_channel_free(channel); 828 break; 829 default: 830 break; 831 } 832 } 833 } 834 835 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 836 linked_list_iterator_t it; 837 linked_list_iterator_init(&it, &l2cap_channels); 838 while (linked_list_iterator_has_next(&it)){ 839 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 840 if ( ! BD_ADDR_CMP( channel->address, address) ){ 841 l2cap_handle_connection_complete(handle, channel); 842 } 843 } 844 // process 845 l2cap_run(); 846 } 847 848 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 849 850 bd_addr_t address; 851 hci_con_handle_t handle; 852 linked_list_iterator_t it; 853 int hci_con_used; 854 855 switch(packet[0]){ 856 857 // handle connection complete events 858 case HCI_EVENT_CONNECTION_COMPLETE: 859 bt_flip_addr(address, &packet[5]); 860 if (packet[2] == 0){ 861 handle = READ_BT_16(packet, 3); 862 l2cap_handle_connection_success_for_addr(address, handle); 863 } else { 864 l2cap_handle_connection_failed_for_addr(address, packet[2]); 865 } 866 break; 867 868 // handle successful create connection cancel command 869 case HCI_EVENT_COMMAND_COMPLETE: 870 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 871 if (packet[5] == 0){ 872 bt_flip_addr(address, &packet[6]); 873 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 874 l2cap_handle_connection_failed_for_addr(address, 0x16); 875 } 876 } 877 l2cap_run(); // try sending signaling packets first 878 break; 879 880 case HCI_EVENT_COMMAND_STATUS: 881 l2cap_run(); // try sending signaling packets first 882 break; 883 884 // handle disconnection complete events 885 case HCI_EVENT_DISCONNECTION_COMPLETE: 886 // send l2cap disconnect events for all channels on this handle and free them 887 handle = READ_BT_16(packet, 3); 888 linked_list_iterator_init(&it, &l2cap_channels); 889 while (linked_list_iterator_has_next(&it)){ 890 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 891 if (channel->handle != handle) continue; 892 l2cap_emit_channel_closed(channel); 893 l2cap_stop_rtx(channel); 894 linked_list_iterator_remove(&it); 895 btstack_memory_l2cap_channel_free(channel); 896 } 897 break; 898 899 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 900 l2cap_run(); // try sending signaling packets first 901 l2cap_hand_out_credits(); 902 break; 903 904 // HCI Connection Timeouts 905 case L2CAP_EVENT_TIMEOUT_CHECK: 906 handle = READ_BT_16(packet, 2); 907 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 908 if (hci_authentication_active_for_handle(handle)) break; 909 hci_con_used = 0; 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 hci_con_used = 1; 915 break; 916 } 917 if (hci_con_used) break; 918 if (!hci_can_send_command_packet_now()) break; 919 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 920 break; 921 922 case DAEMON_EVENT_HCI_PACKET_SENT: 923 l2cap_run(); // try sending signaling packets first 924 l2cap_hand_out_credits(); 925 926 linked_list_iterator_init(&it, &l2cap_channels); 927 while (linked_list_iterator_has_next(&it)){ 928 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 929 if (!channel->packet_handler) continue; 930 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 931 } 932 if (attribute_protocol_packet_handler) { 933 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 934 } 935 if (security_protocol_packet_handler) { 936 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 937 } 938 if (connectionless_channel_packet_handler) { 939 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 940 } 941 break; 942 943 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 944 handle = READ_BT_16(packet, 3); 945 linked_list_iterator_init(&it, &l2cap_channels); 946 while (linked_list_iterator_has_next(&it)){ 947 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 948 if (channel->handle != handle) continue; 949 l2cap_handle_remote_supported_features_received(channel); 950 break; 951 } 952 break; 953 954 case GAP_SECURITY_LEVEL: 955 handle = READ_BT_16(packet, 2); 956 log_info("l2cap - security level update"); 957 linked_list_iterator_init(&it, &l2cap_channels); 958 while (linked_list_iterator_has_next(&it)){ 959 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 960 if (channel->handle != handle) continue; 961 962 log_info("l2cap - state %u", channel->state); 963 964 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 965 gap_security_level_t required_level = channel->required_security_level; 966 967 switch (channel->state){ 968 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 969 if (actual_level >= required_level){ 970 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 971 l2cap_emit_connection_request(channel); 972 } else { 973 channel->reason = 0x0003; // security block 974 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 975 } 976 break; 977 978 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 979 if (actual_level >= required_level){ 980 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 981 } else { 982 // disconnnect, authentication not good enough 983 hci_disconnect_security_block(handle); 984 } 985 break; 986 987 default: 988 break; 989 } 990 } 991 break; 992 993 default: 994 break; 995 } 996 997 // pass on: main packet handler, att and sm packet handlers 998 (*packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 999 if (attribute_protocol_packet_handler){ 1000 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1001 } 1002 if (security_protocol_packet_handler) { 1003 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1004 } 1005 if (connectionless_channel_packet_handler) { 1006 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1007 } 1008 1009 l2cap_run(); 1010 } 1011 1012 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1013 channel->remote_sig_id = identifier; 1014 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1015 l2cap_run(); 1016 } 1017 1018 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1019 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1020 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1021 signaling_responses[signaling_responses_pending].handle = handle; 1022 signaling_responses[signaling_responses_pending].code = code; 1023 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1024 signaling_responses[signaling_responses_pending].data = data; 1025 signaling_responses_pending++; 1026 l2cap_run(); 1027 } 1028 } 1029 1030 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1031 1032 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1033 l2cap_service_t *service = l2cap_get_service(psm); 1034 if (!service) { 1035 // 0x0002 PSM not supported 1036 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1037 return; 1038 } 1039 1040 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1041 if (!hci_connection) { 1042 // 1043 log_error("no hci_connection for handle %u", handle); 1044 return; 1045 } 1046 1047 // alloc structure 1048 // log_info("l2cap_handle_connection_request register channel"); 1049 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1050 if (!channel){ 1051 // 0x0004 No resources available 1052 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1053 return; 1054 } 1055 // Init memory (make valgrind happy) 1056 memset(channel, 0, sizeof(l2cap_channel_t)); 1057 // fill in 1058 BD_ADDR_COPY(channel->address, hci_connection->address); 1059 channel->psm = psm; 1060 channel->handle = handle; 1061 channel->packet_handler = service->packet_handler; 1062 channel->local_cid = l2cap_next_local_cid(); 1063 channel->remote_cid = source_cid; 1064 channel->local_mtu = service->mtu; 1065 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1066 channel->remote_sig_id = sig_id; 1067 channel->required_security_level = service->required_security_level; 1068 1069 // limit local mtu to max acl packet length - l2cap header 1070 if (channel->local_mtu > l2cap_max_mtu()) { 1071 channel->local_mtu = l2cap_max_mtu(); 1072 } 1073 1074 // set initial state 1075 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1076 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1077 1078 // add to connections list 1079 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1080 1081 // assert security requirements 1082 gap_request_security_level(handle, channel->required_security_level); 1083 } 1084 1085 void l2cap_accept_connection_internal(uint16_t local_cid){ 1086 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1087 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1088 if (!channel) { 1089 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1090 return; 1091 } 1092 1093 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1094 1095 // process 1096 l2cap_run(); 1097 } 1098 1099 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1100 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1101 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1102 if (!channel) { 1103 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1104 return; 1105 } 1106 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1107 channel->reason = reason; 1108 l2cap_run(); 1109 } 1110 1111 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1112 1113 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1114 1115 uint16_t flags = READ_BT_16(command, 6); 1116 if (flags & 1) { 1117 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1118 } 1119 1120 // accept the other's configuration options 1121 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1122 uint16_t pos = 8; 1123 while (pos < end_pos){ 1124 uint8_t option_hint = command[pos] >> 7; 1125 uint8_t option_type = command[pos] & 0x7f; 1126 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1127 pos++; 1128 uint8_t length = command[pos++]; 1129 // MTU { type(8): 1, len(8):2, MTU(16) } 1130 if (option_type == 1 && length == 2){ 1131 channel->remote_mtu = READ_BT_16(command, pos); 1132 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1133 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1134 } 1135 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1136 if (option_type == 2 && length == 2){ 1137 channel->flush_timeout = READ_BT_16(command, pos); 1138 } 1139 // check for unknown options 1140 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1141 log_info("l2cap cid %u, unknown options", channel->local_cid); 1142 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1143 } 1144 pos += length; 1145 } 1146 } 1147 1148 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1149 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1150 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1151 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1152 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1153 if (channel->state == L2CAP_STATE_OPEN) return 0; 1154 return 1; 1155 } 1156 1157 1158 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1159 1160 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1161 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1162 uint16_t result = 0; 1163 1164 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1165 1166 // handle DISCONNECT REQUESTS seperately 1167 if (code == DISCONNECTION_REQUEST){ 1168 switch (channel->state){ 1169 case L2CAP_STATE_CONFIG: 1170 case L2CAP_STATE_OPEN: 1171 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1172 case L2CAP_STATE_WAIT_DISCONNECT: 1173 l2cap_handle_disconnect_request(channel, identifier); 1174 break; 1175 1176 default: 1177 // ignore in other states 1178 break; 1179 } 1180 return; 1181 } 1182 1183 // @STATEMACHINE(l2cap) 1184 switch (channel->state) { 1185 1186 case L2CAP_STATE_WAIT_CONNECT_RSP: 1187 switch (code){ 1188 case CONNECTION_RESPONSE: 1189 l2cap_stop_rtx(channel); 1190 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1191 switch (result) { 1192 case 0: 1193 // successful connection 1194 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1195 channel->state = L2CAP_STATE_CONFIG; 1196 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1197 break; 1198 case 1: 1199 // connection pending. get some coffee, but start the ERTX 1200 l2cap_start_ertx(channel); 1201 break; 1202 default: 1203 // channel closed 1204 channel->state = L2CAP_STATE_CLOSED; 1205 // map l2cap connection response result to BTstack status enumeration 1206 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1207 1208 // drop link key if security block 1209 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1210 hci_drop_link_key_for_bd_addr(channel->address); 1211 } 1212 1213 // discard channel 1214 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1215 btstack_memory_l2cap_channel_free(channel); 1216 break; 1217 } 1218 break; 1219 1220 default: 1221 //@TODO: implement other signaling packets 1222 break; 1223 } 1224 break; 1225 1226 case L2CAP_STATE_CONFIG: 1227 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1228 switch (code) { 1229 case CONFIGURE_REQUEST: 1230 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1231 l2cap_signaling_handle_configure_request(channel, command); 1232 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1233 // only done if continuation not set 1234 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1235 } 1236 break; 1237 case CONFIGURE_RESPONSE: 1238 l2cap_stop_rtx(channel); 1239 switch (result){ 1240 case 0: // success 1241 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1242 break; 1243 case 4: // pending 1244 l2cap_start_ertx(channel); 1245 break; 1246 default: 1247 // retry on negative result 1248 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1249 break; 1250 } 1251 break; 1252 default: 1253 break; 1254 } 1255 if (l2cap_channel_ready_for_open(channel)){ 1256 // for open: 1257 channel->state = L2CAP_STATE_OPEN; 1258 l2cap_emit_channel_opened(channel, 0); 1259 l2cap_emit_credits(channel, 1); 1260 } 1261 break; 1262 1263 case L2CAP_STATE_WAIT_DISCONNECT: 1264 switch (code) { 1265 case DISCONNECTION_RESPONSE: 1266 l2cap_finialize_channel_close(channel); 1267 break; 1268 default: 1269 //@TODO: implement other signaling packets 1270 break; 1271 } 1272 break; 1273 1274 case L2CAP_STATE_CLOSED: 1275 // @TODO handle incoming requests 1276 break; 1277 1278 case L2CAP_STATE_OPEN: 1279 //@TODO: implement other signaling packets, e.g. re-configure 1280 break; 1281 default: 1282 break; 1283 } 1284 // log_info("new state %u", channel->state); 1285 } 1286 1287 1288 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1289 1290 // get code, signalind identifier and command len 1291 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1292 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1293 1294 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1295 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1296 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1297 return; 1298 } 1299 1300 // general commands without an assigned channel 1301 switch(code) { 1302 1303 case CONNECTION_REQUEST: { 1304 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1305 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1306 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1307 return; 1308 } 1309 1310 case ECHO_REQUEST: 1311 l2cap_register_signaling_response(handle, code, sig_id, 0); 1312 return; 1313 1314 case INFORMATION_REQUEST: { 1315 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1316 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1317 return; 1318 } 1319 1320 default: 1321 break; 1322 } 1323 1324 1325 // Get potential destination CID 1326 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1327 1328 // Find channel for this sig_id and connection handle 1329 linked_list_iterator_t it; 1330 linked_list_iterator_init(&it, &l2cap_channels); 1331 while (linked_list_iterator_has_next(&it)){ 1332 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1333 if (channel->handle != handle) continue; 1334 if (code & 1) { 1335 // match odd commands (responses) by previous signaling identifier 1336 if (channel->local_sig_id == sig_id) { 1337 l2cap_signaling_handler_channel(channel, command); 1338 break; 1339 } 1340 } else { 1341 // match even commands (requests) by local channel id 1342 if (channel->local_cid == dest_cid) { 1343 l2cap_signaling_handler_channel(channel, command); 1344 break; 1345 } 1346 } 1347 } 1348 } 1349 1350 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1351 1352 // Get Channel ID 1353 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1354 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1355 1356 switch (channel_id) { 1357 1358 case L2CAP_CID_SIGNALING: { 1359 1360 uint16_t command_offset = 8; 1361 while (command_offset < size) { 1362 1363 // handle signaling commands 1364 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1365 1366 // increment command_offset 1367 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1368 } 1369 break; 1370 } 1371 1372 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1373 if (attribute_protocol_packet_handler) { 1374 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1375 } 1376 break; 1377 1378 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1379 if (security_protocol_packet_handler) { 1380 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1381 } 1382 break; 1383 1384 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1385 if (connectionless_channel_packet_handler) { 1386 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1387 } 1388 break; 1389 1390 case L2CAP_CID_SIGNALING_LE: { 1391 switch (packet[8]){ 1392 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1393 uint16_t result = READ_BT_16(packet, 12); 1394 l2cap_emit_connection_parameter_update_response(handle, result); 1395 break; 1396 } 1397 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1398 uint8_t event[10]; 1399 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1400 event[1] = 8; 1401 memcpy(&event[2], &packet[12], 8); 1402 1403 hci_connection_t * connection = hci_connection_for_handle(handle); 1404 if (connection){ 1405 if (connection->role != HCI_ROLE_MASTER){ 1406 // reject command without notifying upper layer when not in master role 1407 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1408 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1409 break; 1410 } 1411 int update_parameter = 1; 1412 le_connection_parameter_range_t existing_range; 1413 gap_le_get_connection_parameter_range(existing_range); 1414 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1415 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1416 uint16_t le_conn_latency = READ_BT_16(packet,16); 1417 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1418 1419 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1420 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1421 1422 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1423 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1424 1425 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1426 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1427 1428 if (update_parameter){ 1429 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1430 connection->le_conn_interval_min = le_conn_interval_min; 1431 connection->le_conn_interval_max = le_conn_interval_max; 1432 connection->le_conn_latency = le_conn_latency; 1433 connection->le_supervision_timeout = le_supervision_timeout; 1434 } else { 1435 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1436 } 1437 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1438 } 1439 1440 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1441 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1442 1443 break; 1444 } 1445 default: { 1446 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1447 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1448 break; 1449 } 1450 } 1451 break; 1452 } 1453 1454 default: { 1455 // Find channel for this channel_id and connection handle 1456 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1457 if (channel) { 1458 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1459 } 1460 break; 1461 } 1462 } 1463 } 1464 1465 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1466 switch (packet_type) { 1467 case HCI_EVENT_PACKET: 1468 l2cap_event_handler(packet, size); 1469 break; 1470 case HCI_ACL_DATA_PACKET: 1471 l2cap_acl_handler(packet, size); 1472 break; 1473 default: 1474 break; 1475 } 1476 l2cap_run(); 1477 } 1478 1479 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1480 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1481 channel->state = L2CAP_STATE_CLOSED; 1482 l2cap_emit_channel_closed(channel); 1483 // discard channel 1484 l2cap_stop_rtx(channel); 1485 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1486 btstack_memory_l2cap_channel_free(channel); 1487 } 1488 1489 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1490 linked_list_iterator_t it; 1491 linked_list_iterator_init(&it, services); 1492 while (linked_list_iterator_has_next(&it)){ 1493 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1494 if ( service->psm == psm){ 1495 return service; 1496 }; 1497 } 1498 return NULL; 1499 } 1500 1501 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1502 return l2cap_get_service_internal(&l2cap_services, psm); 1503 } 1504 1505 1506 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1507 1508 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1509 1510 // check for alread registered psm 1511 // TODO: emit error event 1512 l2cap_service_t *service = l2cap_get_service(psm); 1513 if (service) { 1514 log_error("l2cap_register_service: PSM %u already registered", psm); 1515 return L2CAP_SERVICE_ALREADY_REGISTERED; 1516 } 1517 1518 // alloc structure 1519 // TODO: emit error event 1520 service = btstack_memory_l2cap_service_get(); 1521 if (!service) { 1522 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1523 return BTSTACK_MEMORY_ALLOC_FAILED; 1524 } 1525 1526 // fill in 1527 service->psm = psm; 1528 service->mtu = mtu; 1529 service->packet_handler = service_packet_handler; 1530 service->required_security_level = security_level; 1531 1532 // add to services list 1533 linked_list_add(&l2cap_services, (linked_item_t *) service); 1534 1535 // enable page scan 1536 hci_connectable_control(1); 1537 1538 return 0; 1539 } 1540 1541 void l2cap_unregister_service(uint16_t psm){ 1542 1543 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1544 1545 l2cap_service_t *service = l2cap_get_service(psm); 1546 if (!service) return; 1547 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1548 btstack_memory_l2cap_service_free(service); 1549 1550 // disable page scan when no services registered 1551 if (!linked_list_empty(&l2cap_services)) return; 1552 hci_connectable_control(0); 1553 } 1554 1555 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1556 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1557 switch(channel_id){ 1558 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1559 attribute_protocol_packet_handler = the_packet_handler; 1560 break; 1561 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1562 security_protocol_packet_handler = the_packet_handler; 1563 break; 1564 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1565 connectionless_channel_packet_handler = the_packet_handler; 1566 break; 1567 } 1568 } 1569 1570 #ifdef HAVE_BLE 1571 1572 1573 #if 0 1574 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1575 return l2cap_get_service_internal(&l2cap_le_services, psm); 1576 } 1577 /** 1578 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1579 * @param 1580 */ 1581 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1582 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1583 1584 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1585 1586 // check for alread registered psm 1587 // TODO: emit error event 1588 l2cap_service_t *service = l2cap_le_get_service(psm); 1589 if (service) { 1590 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1591 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1592 return; 1593 } 1594 1595 // alloc structure 1596 // TODO: emit error event 1597 service = btstack_memory_l2cap_service_get(); 1598 if (!service) { 1599 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1600 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1601 return; 1602 } 1603 1604 // fill in 1605 service->psm = psm; 1606 service->mtu = mtu; 1607 service->mps = mps; 1608 service->packet_handler = packet_handler; 1609 service->required_security_level = security_level; 1610 1611 // add to services list 1612 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1613 1614 // done 1615 l2cap_emit_service_registered(connection, 0, psm); 1616 } 1617 1618 void l2cap_le_unregister_service(uint16_t psm) { 1619 1620 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1621 1622 l2cap_service_t *service = l2cap_le_get_service(psm); 1623 if (!service) return; 1624 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1625 btstack_memory_l2cap_service_free(service); 1626 } 1627 #endif 1628 #endif 1629