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 linked_list_t l2cap_le_channels; 79 static linked_list_t l2cap_le_services; 80 static void (*packet_handler) (void * connection, 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(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 121 } 122 void l2cap_register_packet_handler(void (*handler)(void * connection, 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)(channel->connection, 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)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 } 189 190 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 191 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 192 uint8_t event[5]; 193 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 194 event[1] = sizeof(event) - 2; 195 event[2] = status; 196 bt_store_16(event, 3, psm); 197 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 198 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 199 } 200 201 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 202 203 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, 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 static void l2cap_hand_out_credits(void){ 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->state != L2CAP_STATE_OPEN) continue; 220 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 221 l2cap_emit_credits(channel, 1); 222 } 223 } 224 225 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 226 linked_list_iterator_t it; 227 linked_list_iterator_init(&it, &l2cap_channels); 228 while (linked_list_iterator_has_next(&it)){ 229 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 230 if ( channel->local_cid == local_cid) { 231 return channel; 232 } 233 } 234 return NULL; 235 } 236 237 int l2cap_can_send_packet_now(uint16_t local_cid){ 238 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 239 if (!channel) return 0; 240 return hci_can_send_acl_packet_now(channel->handle); 241 } 242 243 // @deprecated 244 int l2cap_can_send_connectionless_packet_now(void){ 245 // TODO provide real handle 246 return l2cap_can_send_fixed_channel_packet_now(0x1234); 247 } 248 249 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 250 return hci_can_send_acl_packet_now(handle); 251 } 252 253 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 254 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 255 if (channel) { 256 return channel->remote_mtu; 257 } 258 return 0; 259 } 260 261 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 262 linked_list_iterator_t it; 263 linked_list_iterator_init(&it, &l2cap_channels); 264 while (linked_list_iterator_has_next(&it)){ 265 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 266 if ( &channel->rtx == ts) { 267 return channel; 268 } 269 } 270 return NULL; 271 } 272 273 static void l2cap_rtx_timeout(timer_source_t * ts){ 274 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 275 if (!ts) return; 276 277 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 278 279 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 280 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 281 // notify client 282 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 283 284 // discard channel 285 // no need to stop timer here, it is removed from list during timer callback 286 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 287 btstack_memory_l2cap_channel_free(channel); 288 } 289 290 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 291 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 292 run_loop_remove_timer(&channel->rtx); 293 } 294 295 static void l2cap_start_rtx(l2cap_channel_t * channel){ 296 l2cap_stop_rtx(channel); 297 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 298 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 299 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 300 run_loop_add_timer(&channel->rtx); 301 } 302 303 static void l2cap_start_ertx(l2cap_channel_t * channel){ 304 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 305 l2cap_stop_rtx(channel); 306 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 307 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 308 run_loop_add_timer(&channel->rtx); 309 } 310 311 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 312 require_security_level2_for_outgoing_sdp = 1; 313 } 314 315 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 316 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 317 } 318 319 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 320 321 if (!hci_can_send_acl_packet_now(handle)){ 322 log_info("l2cap_send_signaling_packet, cannot send"); 323 return BTSTACK_ACL_BUFFERS_FULL; 324 } 325 326 // log_info("l2cap_send_signaling_packet type %u", cmd); 327 hci_reserve_packet_buffer(); 328 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 329 va_list argptr; 330 va_start(argptr, identifier); 331 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 332 va_end(argptr); 333 // log_info("l2cap_send_signaling_packet con %u!", handle); 334 return hci_send_acl_packet_buffer(len); 335 } 336 337 #ifdef HAVE_BLE 338 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 339 340 if (!hci_can_send_acl_packet_now(handle)){ 341 log_info("l2cap_send_signaling_packet, cannot send"); 342 return BTSTACK_ACL_BUFFERS_FULL; 343 } 344 345 // log_info("l2cap_send_signaling_packet type %u", cmd); 346 hci_reserve_packet_buffer(); 347 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 348 va_list argptr; 349 va_start(argptr, identifier); 350 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 351 va_end(argptr); 352 // log_info("l2cap_send_signaling_packet con %u!", handle); 353 return hci_send_acl_packet_buffer(len); 354 } 355 #endif 356 357 uint8_t *l2cap_get_outgoing_buffer(void){ 358 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 359 } 360 361 int l2cap_reserve_packet_buffer(void){ 362 return hci_reserve_packet_buffer(); 363 } 364 365 void l2cap_release_packet_buffer(void){ 366 hci_release_packet_buffer(); 367 } 368 369 370 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 371 372 if (!hci_is_packet_buffer_reserved()){ 373 log_error("l2cap_send_prepared called without reserving packet first"); 374 return BTSTACK_ACL_BUFFERS_FULL; 375 } 376 377 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 378 if (!channel) { 379 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 380 return -1; // TODO: define error 381 } 382 383 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 384 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 385 return BTSTACK_ACL_BUFFERS_FULL; 386 } 387 388 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 389 390 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 391 392 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 393 394 // 0 - Connection handle : PB=pb : BC=00 395 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 396 // 2 - ACL length 397 bt_store_16(acl_buffer, 2, len + 4); 398 // 4 - L2CAP packet length 399 bt_store_16(acl_buffer, 4, len + 0); 400 // 6 - L2CAP channel DEST 401 bt_store_16(acl_buffer, 6, channel->remote_cid); 402 // send 403 int err = hci_send_acl_packet_buffer(len+8); 404 405 l2cap_hand_out_credits(); 406 407 return err; 408 } 409 410 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 411 412 if (!hci_is_packet_buffer_reserved()){ 413 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 414 return BTSTACK_ACL_BUFFERS_FULL; 415 } 416 417 if (!hci_can_send_prepared_acl_packet_now(handle)){ 418 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 419 return BTSTACK_ACL_BUFFERS_FULL; 420 } 421 422 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 423 424 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 425 426 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 427 428 // 0 - Connection handle : PB=pb : BC=00 429 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 430 // 2 - ACL length 431 bt_store_16(acl_buffer, 2, len + 4); 432 // 4 - L2CAP packet length 433 bt_store_16(acl_buffer, 4, len + 0); 434 // 6 - L2CAP channel DEST 435 bt_store_16(acl_buffer, 6, cid); 436 // send 437 int err = hci_send_acl_packet_buffer(len+8); 438 439 l2cap_hand_out_credits(); 440 441 return err; 442 } 443 444 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 445 446 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 447 if (!channel) { 448 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 449 return -1; // TODO: define error 450 } 451 452 if (len > channel->remote_mtu){ 453 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 454 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 455 } 456 457 if (!hci_can_send_acl_packet_now(channel->handle)){ 458 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 459 return BTSTACK_ACL_BUFFERS_FULL; 460 } 461 462 hci_reserve_packet_buffer(); 463 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 464 465 memcpy(&acl_buffer[8], data, len); 466 467 return l2cap_send_prepared(local_cid, len); 468 } 469 470 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 471 472 if (!hci_can_send_acl_packet_now(handle)){ 473 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 474 return BTSTACK_ACL_BUFFERS_FULL; 475 } 476 477 hci_reserve_packet_buffer(); 478 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 479 480 memcpy(&acl_buffer[8], data, len); 481 482 return l2cap_send_prepared_connectionless(handle, cid, len); 483 } 484 485 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 486 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 487 } 488 489 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 490 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 491 } 492 493 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 494 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 495 } 496 497 498 499 // MARK: L2CAP_RUN 500 // process outstanding signaling tasks 501 static void l2cap_run(void){ 502 503 // log_info("l2cap_run: entered"); 504 505 // check pending signaling responses 506 while (signaling_responses_pending){ 507 508 hci_con_handle_t handle = signaling_responses[0].handle; 509 510 if (!hci_can_send_acl_packet_now(handle)) break; 511 512 uint8_t sig_id = signaling_responses[0].sig_id; 513 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 514 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 515 uint8_t response_code = signaling_responses[0].code; 516 517 // remove first item before sending (to avoid sending response mutliple times) 518 signaling_responses_pending--; 519 int i; 520 for (i=0; i < signaling_responses_pending; i++){ 521 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 522 } 523 524 switch (response_code){ 525 case CONNECTION_REQUEST: 526 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 527 // also disconnect if result is 0x0003 - security blocked 528 if (result == 0x0003){ 529 hci_disconnect_security_block(handle); 530 } 531 break; 532 case ECHO_REQUEST: 533 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 534 break; 535 case INFORMATION_REQUEST: 536 switch (infoType){ 537 case 1: { // Connectionless MTU 538 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 539 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 540 break; 541 } 542 case 2: { // Extended Features Supported 543 // extended features request supported, features: fixed channels, unicast connectionless data reception 544 uint32_t features = 0x280; 545 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 546 break; 547 } 548 case 3: { // Fixed Channels Supported 549 uint8_t map[8]; 550 memset(map, 0, 8); 551 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 552 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 553 break; 554 } 555 default: 556 // all other types are not supported 557 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 558 break; 559 } 560 break; 561 case COMMAND_REJECT: 562 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 563 #ifdef HAVE_BLE 564 case COMMAND_REJECT_LE: 565 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 566 break; 567 #endif 568 default: 569 // should not happen 570 break; 571 } 572 } 573 574 uint8_t config_options[4]; 575 linked_list_iterator_t it; 576 linked_list_iterator_init(&it, &l2cap_channels); 577 while (linked_list_iterator_has_next(&it)){ 578 579 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 580 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 581 switch (channel->state){ 582 583 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 584 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 585 if (!hci_can_send_acl_packet_now(channel->handle)) break; 586 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 587 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 588 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 589 } 590 break; 591 592 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 593 if (!hci_can_send_command_packet_now()) break; 594 // send connection request - set state first 595 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 596 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 597 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 598 break; 599 600 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 601 if (!hci_can_send_acl_packet_now(channel->handle)) break; 602 channel->state = L2CAP_STATE_INVALID; 603 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 604 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 605 l2cap_stop_rtx(channel); 606 linked_list_iterator_remove(&it); 607 btstack_memory_l2cap_channel_free(channel); 608 break; 609 610 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 611 if (!hci_can_send_acl_packet_now(channel->handle)) break; 612 channel->state = L2CAP_STATE_CONFIG; 613 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 614 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 615 break; 616 617 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 618 if (!hci_can_send_acl_packet_now(channel->handle)) break; 619 // success, start l2cap handshake 620 channel->local_sig_id = l2cap_next_sig_id(); 621 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 622 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 623 l2cap_start_rtx(channel); 624 break; 625 626 case L2CAP_STATE_CONFIG: 627 if (!hci_can_send_acl_packet_now(channel->handle)) break; 628 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 629 uint16_t flags = 0; 630 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 631 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 632 flags = 1; 633 } else { 634 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 635 } 636 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 637 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 638 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 639 config_options[0] = 1; // MTU 640 config_options[1] = 2; // len param 641 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 642 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 643 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 644 } else { 645 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 646 } 647 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 648 } 649 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 650 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 651 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 652 channel->local_sig_id = l2cap_next_sig_id(); 653 config_options[0] = 1; // MTU 654 config_options[1] = 2; // len param 655 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 656 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 657 l2cap_start_rtx(channel); 658 } 659 if (l2cap_channel_ready_for_open(channel)){ 660 channel->state = L2CAP_STATE_OPEN; 661 l2cap_emit_channel_opened(channel, 0); // success 662 l2cap_emit_credits(channel, 1); 663 } 664 break; 665 666 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 667 if (!hci_can_send_acl_packet_now(channel->handle)) break; 668 channel->state = L2CAP_STATE_INVALID; 669 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 670 // 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 :) 671 l2cap_finialize_channel_close(channel); // -- remove from list 672 break; 673 674 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 675 if (!hci_can_send_acl_packet_now(channel->handle)) break; 676 channel->local_sig_id = l2cap_next_sig_id(); 677 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 678 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 679 break; 680 default: 681 break; 682 } 683 } 684 685 #ifdef HAVE_BLE 686 // send l2cap con paramter update if necessary 687 hci_connections_get_iterator(&it); 688 while(linked_list_iterator_has_next(&it)){ 689 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 690 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 691 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 692 switch (connection->le_con_parameter_update_state){ 693 case CON_PARAMETER_UPDATE_SEND_REQUEST: 694 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 695 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 696 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 697 break; 698 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 699 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 700 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 701 break; 702 case CON_PARAMETER_UPDATE_DENY: 703 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 704 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 705 break; 706 default: 707 break; 708 } 709 } 710 #endif 711 712 // log_info("l2cap_run: exit"); 713 } 714 715 uint16_t l2cap_max_mtu(void){ 716 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 717 } 718 719 uint16_t l2cap_max_le_mtu(void){ 720 return l2cap_max_mtu(); 721 } 722 723 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 724 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 725 log_info("l2cap_handle_connection_complete expected state"); 726 // success, start l2cap handshake 727 channel->handle = handle; 728 channel->local_cid = l2cap_next_local_cid(); 729 // check remote SSP feature first 730 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 731 } 732 } 733 734 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 735 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 736 737 // we have been waiting for remote supported features, if both support SSP, 738 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)); 739 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 740 // request security level 2 741 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 742 gap_request_security_level(channel->handle, LEVEL_2); 743 return; 744 } 745 // fine, go ahead 746 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 747 } 748 749 // open outgoing L2CAP channel 750 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t channel_packet_handler, 751 bd_addr_t address, uint16_t psm, uint16_t mtu){ 752 753 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 754 755 // alloc structure 756 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 757 if (!chan) { 758 // emit error event 759 l2cap_channel_t dummy_channel; 760 BD_ADDR_COPY(dummy_channel.address, address); 761 dummy_channel.psm = psm; 762 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 763 return; 764 } 765 // Init memory (make valgrind happy) 766 memset(chan, 0, sizeof(l2cap_channel_t)); 767 // limit local mtu to max acl packet length - l2cap header 768 if (mtu > l2cap_max_mtu()) { 769 mtu = l2cap_max_mtu(); 770 } 771 772 // fill in 773 BD_ADDR_COPY(chan->address, address); 774 chan->psm = psm; 775 chan->handle = 0; 776 chan->connection = connection; 777 chan->packet_handler = channel_packet_handler; 778 chan->remote_mtu = L2CAP_MINIMAL_MTU; 779 chan->local_mtu = mtu; 780 781 // set initial state 782 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 783 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 784 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 785 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 786 chan->required_security_level = LEVEL_0; 787 788 // add to connections list 789 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 790 791 // check if hci connection is already usable 792 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 793 if (conn){ 794 log_info("l2cap_create_channel_internal, hci connection already exists"); 795 l2cap_handle_connection_complete(conn->con_handle, chan); 796 // check if remote supported fearures are already received 797 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 798 l2cap_handle_remote_supported_features_received(chan); 799 } 800 } 801 802 l2cap_run(); 803 } 804 805 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 806 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 807 // find channel for local_cid 808 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 809 if (channel) { 810 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 811 } 812 // process 813 l2cap_run(); 814 } 815 816 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 817 linked_list_iterator_t it; 818 linked_list_iterator_init(&it, &l2cap_channels); 819 while (linked_list_iterator_has_next(&it)){ 820 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 821 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 822 // channel for this address found 823 switch (channel->state){ 824 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 825 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 826 // failure, forward error code 827 l2cap_emit_channel_opened(channel, status); 828 // discard channel 829 l2cap_stop_rtx(channel); 830 linked_list_iterator_remove(&it); 831 btstack_memory_l2cap_channel_free(channel); 832 break; 833 default: 834 break; 835 } 836 } 837 } 838 839 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 840 linked_list_iterator_t it; 841 linked_list_iterator_init(&it, &l2cap_channels); 842 while (linked_list_iterator_has_next(&it)){ 843 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 844 if ( ! BD_ADDR_CMP( channel->address, address) ){ 845 l2cap_handle_connection_complete(handle, channel); 846 } 847 } 848 // process 849 l2cap_run(); 850 } 851 852 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 853 854 bd_addr_t address; 855 hci_con_handle_t handle; 856 linked_list_iterator_t it; 857 int hci_con_used; 858 859 switch(packet[0]){ 860 861 // handle connection complete events 862 case HCI_EVENT_CONNECTION_COMPLETE: 863 bt_flip_addr(address, &packet[5]); 864 if (packet[2] == 0){ 865 handle = READ_BT_16(packet, 3); 866 l2cap_handle_connection_success_for_addr(address, handle); 867 } else { 868 l2cap_handle_connection_failed_for_addr(address, packet[2]); 869 } 870 break; 871 872 // handle successful create connection cancel command 873 case HCI_EVENT_COMMAND_COMPLETE: 874 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 875 if (packet[5] == 0){ 876 bt_flip_addr(address, &packet[6]); 877 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 878 l2cap_handle_connection_failed_for_addr(address, 0x16); 879 } 880 } 881 l2cap_run(); // try sending signaling packets first 882 break; 883 884 case HCI_EVENT_COMMAND_STATUS: 885 l2cap_run(); // try sending signaling packets first 886 break; 887 888 // handle disconnection complete events 889 case HCI_EVENT_DISCONNECTION_COMPLETE: 890 // send l2cap disconnect events for all channels on this handle and free them 891 handle = READ_BT_16(packet, 3); 892 linked_list_iterator_init(&it, &l2cap_channels); 893 while (linked_list_iterator_has_next(&it)){ 894 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 895 if (channel->handle != handle) continue; 896 l2cap_emit_channel_closed(channel); 897 l2cap_stop_rtx(channel); 898 linked_list_iterator_remove(&it); 899 btstack_memory_l2cap_channel_free(channel); 900 } 901 break; 902 903 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 904 l2cap_run(); // try sending signaling packets first 905 l2cap_hand_out_credits(); 906 break; 907 908 // HCI Connection Timeouts 909 case L2CAP_EVENT_TIMEOUT_CHECK: 910 handle = READ_BT_16(packet, 2); 911 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 912 if (hci_authentication_active_for_handle(handle)) break; 913 hci_con_used = 0; 914 linked_list_iterator_init(&it, &l2cap_channels); 915 while (linked_list_iterator_has_next(&it)){ 916 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 917 if (channel->handle != handle) continue; 918 hci_con_used = 1; 919 break; 920 } 921 if (hci_con_used) break; 922 if (!hci_can_send_command_packet_now()) break; 923 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 924 break; 925 926 case DAEMON_EVENT_HCI_PACKET_SENT: 927 l2cap_run(); // try sending signaling packets first 928 l2cap_hand_out_credits(); 929 930 linked_list_iterator_init(&it, &l2cap_channels); 931 while (linked_list_iterator_has_next(&it)){ 932 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 933 if (!channel->packet_handler) continue; 934 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 935 } 936 if (attribute_protocol_packet_handler) { 937 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 938 } 939 if (security_protocol_packet_handler) { 940 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 941 } 942 if (connectionless_channel_packet_handler) { 943 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 944 } 945 break; 946 947 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 948 handle = READ_BT_16(packet, 3); 949 linked_list_iterator_init(&it, &l2cap_channels); 950 while (linked_list_iterator_has_next(&it)){ 951 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 952 if (channel->handle != handle) continue; 953 l2cap_handle_remote_supported_features_received(channel); 954 break; 955 } 956 break; 957 958 case GAP_SECURITY_LEVEL: 959 handle = READ_BT_16(packet, 2); 960 log_info("l2cap - security level update"); 961 linked_list_iterator_init(&it, &l2cap_channels); 962 while (linked_list_iterator_has_next(&it)){ 963 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 964 if (channel->handle != handle) continue; 965 966 log_info("l2cap - state %u", channel->state); 967 968 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 969 gap_security_level_t required_level = channel->required_security_level; 970 971 switch (channel->state){ 972 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 973 if (actual_level >= required_level){ 974 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 975 l2cap_emit_connection_request(channel); 976 } else { 977 channel->reason = 0x0003; // security block 978 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 979 } 980 break; 981 982 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 983 if (actual_level >= required_level){ 984 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 985 } else { 986 // disconnnect, authentication not good enough 987 hci_disconnect_security_block(handle); 988 } 989 break; 990 991 default: 992 break; 993 } 994 } 995 break; 996 997 default: 998 break; 999 } 1000 1001 // pass on: main packet handler, att and sm packet handlers 1002 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1003 if (attribute_protocol_packet_handler){ 1004 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1005 } 1006 if (security_protocol_packet_handler) { 1007 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1008 } 1009 if (connectionless_channel_packet_handler) { 1010 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1011 } 1012 1013 l2cap_run(); 1014 } 1015 1016 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1017 channel->remote_sig_id = identifier; 1018 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1019 l2cap_run(); 1020 } 1021 1022 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1023 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1024 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1025 signaling_responses[signaling_responses_pending].handle = handle; 1026 signaling_responses[signaling_responses_pending].code = code; 1027 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1028 signaling_responses[signaling_responses_pending].data = data; 1029 signaling_responses_pending++; 1030 l2cap_run(); 1031 } 1032 } 1033 1034 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1035 1036 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1037 l2cap_service_t *service = l2cap_get_service(psm); 1038 if (!service) { 1039 // 0x0002 PSM not supported 1040 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1041 return; 1042 } 1043 1044 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1045 if (!hci_connection) { 1046 // 1047 log_error("no hci_connection for handle %u", handle); 1048 return; 1049 } 1050 1051 // alloc structure 1052 // log_info("l2cap_handle_connection_request register channel"); 1053 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1054 if (!channel){ 1055 // 0x0004 No resources available 1056 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1057 return; 1058 } 1059 // Init memory (make valgrind happy) 1060 memset(channel, 0, sizeof(l2cap_channel_t)); 1061 // fill in 1062 BD_ADDR_COPY(channel->address, hci_connection->address); 1063 channel->psm = psm; 1064 channel->handle = handle; 1065 channel->connection = service->connection; 1066 channel->packet_handler = service->packet_handler; 1067 channel->local_cid = l2cap_next_local_cid(); 1068 channel->remote_cid = source_cid; 1069 channel->local_mtu = service->mtu; 1070 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1071 channel->remote_sig_id = sig_id; 1072 channel->required_security_level = service->required_security_level; 1073 1074 // limit local mtu to max acl packet length - l2cap header 1075 if (channel->local_mtu > l2cap_max_mtu()) { 1076 channel->local_mtu = l2cap_max_mtu(); 1077 } 1078 1079 // set initial state 1080 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1081 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1082 1083 // add to connections list 1084 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1085 1086 // assert security requirements 1087 gap_request_security_level(handle, channel->required_security_level); 1088 } 1089 1090 void l2cap_accept_connection_internal(uint16_t local_cid){ 1091 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1092 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1093 if (!channel) { 1094 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1095 return; 1096 } 1097 1098 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1099 1100 // process 1101 l2cap_run(); 1102 } 1103 1104 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1105 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1106 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1107 if (!channel) { 1108 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1109 return; 1110 } 1111 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1112 channel->reason = reason; 1113 l2cap_run(); 1114 } 1115 1116 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1117 1118 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1119 1120 uint16_t flags = READ_BT_16(command, 6); 1121 if (flags & 1) { 1122 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1123 } 1124 1125 // accept the other's configuration options 1126 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1127 uint16_t pos = 8; 1128 while (pos < end_pos){ 1129 uint8_t option_hint = command[pos] >> 7; 1130 uint8_t option_type = command[pos] & 0x7f; 1131 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1132 pos++; 1133 uint8_t length = command[pos++]; 1134 // MTU { type(8): 1, len(8):2, MTU(16) } 1135 if (option_type == 1 && length == 2){ 1136 channel->remote_mtu = READ_BT_16(command, pos); 1137 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1138 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1139 } 1140 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1141 if (option_type == 2 && length == 2){ 1142 channel->flush_timeout = READ_BT_16(command, pos); 1143 } 1144 // check for unknown options 1145 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1146 log_info("l2cap cid %u, unknown options", channel->local_cid); 1147 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1148 } 1149 pos += length; 1150 } 1151 } 1152 1153 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1154 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1155 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1156 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1157 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1158 if (channel->state == L2CAP_STATE_OPEN) return 0; 1159 return 1; 1160 } 1161 1162 1163 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1164 1165 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1166 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1167 uint16_t result = 0; 1168 1169 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1170 1171 // handle DISCONNECT REQUESTS seperately 1172 if (code == DISCONNECTION_REQUEST){ 1173 switch (channel->state){ 1174 case L2CAP_STATE_CONFIG: 1175 case L2CAP_STATE_OPEN: 1176 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1177 case L2CAP_STATE_WAIT_DISCONNECT: 1178 l2cap_handle_disconnect_request(channel, identifier); 1179 break; 1180 1181 default: 1182 // ignore in other states 1183 break; 1184 } 1185 return; 1186 } 1187 1188 // @STATEMACHINE(l2cap) 1189 switch (channel->state) { 1190 1191 case L2CAP_STATE_WAIT_CONNECT_RSP: 1192 switch (code){ 1193 case CONNECTION_RESPONSE: 1194 l2cap_stop_rtx(channel); 1195 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1196 switch (result) { 1197 case 0: 1198 // successful connection 1199 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1200 channel->state = L2CAP_STATE_CONFIG; 1201 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1202 break; 1203 case 1: 1204 // connection pending. get some coffee, but start the ERTX 1205 l2cap_start_ertx(channel); 1206 break; 1207 default: 1208 // channel closed 1209 channel->state = L2CAP_STATE_CLOSED; 1210 // map l2cap connection response result to BTstack status enumeration 1211 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1212 1213 // drop link key if security block 1214 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1215 hci_drop_link_key_for_bd_addr(channel->address); 1216 } 1217 1218 // discard channel 1219 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1220 btstack_memory_l2cap_channel_free(channel); 1221 break; 1222 } 1223 break; 1224 1225 default: 1226 //@TODO: implement other signaling packets 1227 break; 1228 } 1229 break; 1230 1231 case L2CAP_STATE_CONFIG: 1232 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1233 switch (code) { 1234 case CONFIGURE_REQUEST: 1235 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1236 l2cap_signaling_handle_configure_request(channel, command); 1237 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1238 // only done if continuation not set 1239 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1240 } 1241 break; 1242 case CONFIGURE_RESPONSE: 1243 l2cap_stop_rtx(channel); 1244 switch (result){ 1245 case 0: // success 1246 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1247 break; 1248 case 4: // pending 1249 l2cap_start_ertx(channel); 1250 break; 1251 default: 1252 // retry on negative result 1253 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1254 break; 1255 } 1256 break; 1257 default: 1258 break; 1259 } 1260 if (l2cap_channel_ready_for_open(channel)){ 1261 // for open: 1262 channel->state = L2CAP_STATE_OPEN; 1263 l2cap_emit_channel_opened(channel, 0); 1264 l2cap_emit_credits(channel, 1); 1265 } 1266 break; 1267 1268 case L2CAP_STATE_WAIT_DISCONNECT: 1269 switch (code) { 1270 case DISCONNECTION_RESPONSE: 1271 l2cap_finialize_channel_close(channel); 1272 break; 1273 default: 1274 //@TODO: implement other signaling packets 1275 break; 1276 } 1277 break; 1278 1279 case L2CAP_STATE_CLOSED: 1280 // @TODO handle incoming requests 1281 break; 1282 1283 case L2CAP_STATE_OPEN: 1284 //@TODO: implement other signaling packets, e.g. re-configure 1285 break; 1286 default: 1287 break; 1288 } 1289 // log_info("new state %u", channel->state); 1290 } 1291 1292 1293 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1294 1295 // get code, signalind identifier and command len 1296 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1297 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1298 1299 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1300 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1301 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1302 return; 1303 } 1304 1305 // general commands without an assigned channel 1306 switch(code) { 1307 1308 case CONNECTION_REQUEST: { 1309 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1310 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1311 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1312 return; 1313 } 1314 1315 case ECHO_REQUEST: 1316 l2cap_register_signaling_response(handle, code, sig_id, 0); 1317 return; 1318 1319 case INFORMATION_REQUEST: { 1320 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1321 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1322 return; 1323 } 1324 1325 default: 1326 break; 1327 } 1328 1329 1330 // Get potential destination CID 1331 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1332 1333 // Find channel for this sig_id and connection handle 1334 linked_list_iterator_t it; 1335 linked_list_iterator_init(&it, &l2cap_channels); 1336 while (linked_list_iterator_has_next(&it)){ 1337 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1338 if (channel->handle != handle) continue; 1339 if (code & 1) { 1340 // match odd commands (responses) by previous signaling identifier 1341 if (channel->local_sig_id == sig_id) { 1342 l2cap_signaling_handler_channel(channel, command); 1343 break; 1344 } 1345 } else { 1346 // match even commands (requests) by local channel id 1347 if (channel->local_cid == dest_cid) { 1348 l2cap_signaling_handler_channel(channel, command); 1349 break; 1350 } 1351 } 1352 } 1353 } 1354 1355 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1356 1357 // Get Channel ID 1358 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1359 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1360 1361 switch (channel_id) { 1362 1363 case L2CAP_CID_SIGNALING: { 1364 1365 uint16_t command_offset = 8; 1366 while (command_offset < size) { 1367 1368 // handle signaling commands 1369 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1370 1371 // increment command_offset 1372 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1373 } 1374 break; 1375 } 1376 1377 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1378 if (attribute_protocol_packet_handler) { 1379 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1380 } 1381 break; 1382 1383 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1384 if (security_protocol_packet_handler) { 1385 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1386 } 1387 break; 1388 1389 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1390 if (connectionless_channel_packet_handler) { 1391 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1392 } 1393 break; 1394 1395 case L2CAP_CID_SIGNALING_LE: { 1396 switch (packet[8]){ 1397 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1398 uint16_t result = READ_BT_16(packet, 12); 1399 l2cap_emit_connection_parameter_update_response(handle, result); 1400 break; 1401 } 1402 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1403 uint8_t event[10]; 1404 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1405 event[1] = 8; 1406 memcpy(&event[2], &packet[12], 8); 1407 1408 hci_connection_t * connection = hci_connection_for_handle(handle); 1409 if (connection){ 1410 if (connection->role != HCI_ROLE_MASTER){ 1411 // reject command without notifying upper layer when not in master role 1412 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1413 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1414 break; 1415 } 1416 int update_parameter = 1; 1417 le_connection_parameter_range_t existing_range; 1418 gap_le_get_connection_parameter_range(existing_range); 1419 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1420 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1421 uint16_t le_conn_latency = READ_BT_16(packet,16); 1422 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1423 1424 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1425 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1426 1427 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1428 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1429 1430 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1431 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1432 1433 if (update_parameter){ 1434 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1435 connection->le_conn_interval_min = le_conn_interval_min; 1436 connection->le_conn_interval_max = le_conn_interval_max; 1437 connection->le_conn_latency = le_conn_latency; 1438 connection->le_supervision_timeout = le_supervision_timeout; 1439 } else { 1440 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1441 } 1442 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1443 } 1444 1445 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1446 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1447 1448 break; 1449 } 1450 default: { 1451 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1452 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1453 break; 1454 } 1455 } 1456 break; 1457 } 1458 1459 default: { 1460 // Find channel for this channel_id and connection handle 1461 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1462 if (channel) { 1463 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1464 } 1465 break; 1466 } 1467 } 1468 } 1469 1470 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1471 switch (packet_type) { 1472 case HCI_EVENT_PACKET: 1473 l2cap_event_handler(packet, size); 1474 break; 1475 case HCI_ACL_DATA_PACKET: 1476 l2cap_acl_handler(packet, size); 1477 break; 1478 default: 1479 break; 1480 } 1481 l2cap_run(); 1482 } 1483 1484 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1485 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1486 channel->state = L2CAP_STATE_CLOSED; 1487 l2cap_emit_channel_closed(channel); 1488 // discard channel 1489 l2cap_stop_rtx(channel); 1490 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1491 btstack_memory_l2cap_channel_free(channel); 1492 } 1493 1494 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1495 linked_list_iterator_t it; 1496 linked_list_iterator_init(&it, services); 1497 while (linked_list_iterator_has_next(&it)){ 1498 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1499 if ( service->psm == psm){ 1500 return service; 1501 }; 1502 } 1503 return NULL; 1504 } 1505 1506 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1507 return l2cap_get_service_internal(&l2cap_services, psm); 1508 } 1509 1510 void l2cap_register_service_internal(void *connection, btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1511 1512 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1513 1514 // check for alread registered psm 1515 // TODO: emit error event 1516 l2cap_service_t *service = l2cap_get_service(psm); 1517 if (service) { 1518 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1519 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1520 return; 1521 } 1522 1523 // alloc structure 1524 // TODO: emit error event 1525 service = btstack_memory_l2cap_service_get(); 1526 if (!service) { 1527 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1528 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1529 return; 1530 } 1531 1532 // fill in 1533 service->psm = psm; 1534 service->mtu = mtu; 1535 service->connection = connection; 1536 service->packet_handler = service_packet_handler; 1537 service->required_security_level = security_level; 1538 1539 // add to services list 1540 linked_list_add(&l2cap_services, (linked_item_t *) service); 1541 1542 // enable page scan 1543 hci_connectable_control(1); 1544 1545 // done 1546 l2cap_emit_service_registered(connection, 0, psm); 1547 } 1548 1549 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1550 1551 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1552 1553 l2cap_service_t *service = l2cap_get_service(psm); 1554 if (!service) return; 1555 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1556 btstack_memory_l2cap_service_free(service); 1557 1558 // disable page scan when no services registered 1559 if (!linked_list_empty(&l2cap_services)) return; 1560 hci_connectable_control(0); 1561 } 1562 1563 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1564 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1565 switch(channel_id){ 1566 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1567 attribute_protocol_packet_handler = the_packet_handler; 1568 break; 1569 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1570 security_protocol_packet_handler = the_packet_handler; 1571 break; 1572 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1573 connectionless_channel_packet_handler = the_packet_handler; 1574 break; 1575 } 1576 } 1577 1578 #ifdef HAVE_BLE 1579 1580 1581 #if 0 1582 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1583 return l2cap_get_service_internal(&l2cap_le_services, psm); 1584 } 1585 /** 1586 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1587 * @param 1588 */ 1589 void l2cap_le_register_service_internal(void * connection, btstack_packet_handler_t packet_handler, uint16_t psm, 1590 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1591 1592 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1593 1594 // check for alread registered psm 1595 // TODO: emit error event 1596 l2cap_service_t *service = l2cap_le_get_service(psm); 1597 if (service) { 1598 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1599 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1600 return; 1601 } 1602 1603 // alloc structure 1604 // TODO: emit error event 1605 service = btstack_memory_l2cap_service_get(); 1606 if (!service) { 1607 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1608 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1609 return; 1610 } 1611 1612 // fill in 1613 service->psm = psm; 1614 service->mtu = mtu; 1615 service->mps = mps; 1616 service->connection = connection; 1617 service->packet_handler = packet_handler; 1618 service->required_security_level = security_level; 1619 1620 // add to services list 1621 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1622 1623 // done 1624 l2cap_emit_service_registered(connection, 0, psm); 1625 } 1626 1627 void l2cap_le_unregister_service_internal(void * connection, uint16_t psm) { 1628 1629 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1630 1631 l2cap_service_t *service = l2cap_le_get_service(psm); 1632 if (!service) return; 1633 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1634 btstack_memory_l2cap_service_free(service); 1635 } 1636 #endif 1637 #endif 1638