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 static int new_credits_blocked = 0; 82 83 static btstack_packet_handler_t attribute_protocol_packet_handler; 84 static btstack_packet_handler_t security_protocol_packet_handler; 85 static btstack_packet_handler_t connectionless_channel_packet_handler; 86 static uint8_t require_security_level2_for_outgoing_sdp; 87 88 // prototypes 89 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 90 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 91 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 92 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 93 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 94 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 95 96 97 void l2cap_init(void){ 98 new_credits_blocked = 0; 99 signaling_responses_pending = 0; 100 101 l2cap_channels = NULL; 102 l2cap_services = NULL; 103 l2cap_le_services = NULL; 104 l2cap_le_channels = NULL; 105 106 packet_handler = null_packet_handler; 107 attribute_protocol_packet_handler = NULL; 108 security_protocol_packet_handler = NULL; 109 connectionless_channel_packet_handler = NULL; 110 111 require_security_level2_for_outgoing_sdp = 0; 112 113 // 114 // register callback with HCI 115 // 116 hci_register_packet_handler(&l2cap_packet_handler); 117 hci_connectable_control(0); // no services yet 118 } 119 120 121 /** Register L2CAP packet handlers */ 122 static void null_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 123 } 124 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 125 packet_handler = handler; 126 } 127 128 // notify client/protocol handler 129 static void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 130 if (channel->packet_handler) { 131 (* (channel->packet_handler))(type, channel->local_cid, data, size); 132 } else { 133 (*packet_handler)(type, channel->local_cid, data, size); 134 } 135 } 136 137 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 138 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", 139 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 140 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 141 uint8_t event[23]; 142 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 143 event[1] = sizeof(event) - 2; 144 event[2] = status; 145 bt_flip_addr(&event[3], channel->address); 146 bt_store_16(event, 9, channel->handle); 147 bt_store_16(event, 11, channel->psm); 148 bt_store_16(event, 13, channel->local_cid); 149 bt_store_16(event, 15, channel->remote_cid); 150 bt_store_16(event, 17, channel->local_mtu); 151 bt_store_16(event, 19, channel->remote_mtu); 152 bt_store_16(event, 21, channel->flush_timeout); 153 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 154 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 155 } 156 157 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 158 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 159 uint8_t event[4]; 160 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 161 event[1] = sizeof(event) - 2; 162 bt_store_16(event, 2, channel->local_cid); 163 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 164 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 165 } 166 167 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 168 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 169 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 170 uint8_t event[16]; 171 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 172 event[1] = sizeof(event) - 2; 173 bt_flip_addr(&event[2], channel->address); 174 bt_store_16(event, 8, channel->handle); 175 bt_store_16(event, 10, channel->psm); 176 bt_store_16(event, 12, channel->local_cid); 177 bt_store_16(event, 14, channel->remote_cid); 178 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 179 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 180 } 181 182 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 183 uint8_t event[6]; 184 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 185 event[1] = 4; 186 bt_store_16(event, 2, handle); 187 bt_store_16(event, 4, result); 188 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 189 (*packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 190 } 191 192 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 193 194 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 195 // track credits 196 channel->packets_granted += credits; 197 198 uint8_t event[5]; 199 event[0] = L2CAP_EVENT_CREDITS; 200 event[1] = sizeof(event) - 2; 201 bt_store_16(event, 2, channel->local_cid); 202 event[4] = credits; 203 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 204 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 205 } 206 207 void l2cap_block_new_credits(uint8_t blocked){ 208 new_credits_blocked = blocked; 209 } 210 211 static void l2cap_hand_out_credits(void){ 212 213 if (new_credits_blocked) return; // we're told not to. used by daemon 214 215 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 if (hci_number_outgoing_packets(channel->handle) < NR_BUFFERED_ACL_PACKETS && channel->packets_granted == 0) { 222 l2cap_emit_credits(channel, 1); 223 } 224 } 225 } 226 227 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 228 linked_list_iterator_t it; 229 linked_list_iterator_init(&it, &l2cap_channels); 230 while (linked_list_iterator_has_next(&it)){ 231 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 232 if ( channel->local_cid == local_cid) { 233 return channel; 234 } 235 } 236 return NULL; 237 } 238 239 int l2cap_can_send_packet_now(uint16_t local_cid){ 240 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 241 if (!channel) return 0; 242 if (!channel->packets_granted) return 0; 243 return hci_can_send_acl_packet_now(channel->handle); 244 } 245 246 // @deprecated 247 int l2cap_can_send_connectionless_packet_now(void){ 248 // TODO provide real handle 249 return l2cap_can_send_fixed_channel_packet_now(0x1234); 250 } 251 252 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 253 return hci_can_send_acl_packet_now(handle); 254 } 255 256 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 257 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 258 if (channel) { 259 return channel->remote_mtu; 260 } 261 return 0; 262 } 263 264 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 265 linked_list_iterator_t it; 266 linked_list_iterator_init(&it, &l2cap_channels); 267 while (linked_list_iterator_has_next(&it)){ 268 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 269 if ( &channel->rtx == ts) { 270 return channel; 271 } 272 } 273 return NULL; 274 } 275 276 static void l2cap_rtx_timeout(timer_source_t * ts){ 277 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 278 if (!ts) return; 279 280 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 281 282 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 283 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 284 // notify client 285 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 286 287 // discard channel 288 // no need to stop timer here, it is removed from list during timer callback 289 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 290 btstack_memory_l2cap_channel_free(channel); 291 } 292 293 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 294 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 295 run_loop_remove_timer(&channel->rtx); 296 } 297 298 static void l2cap_start_rtx(l2cap_channel_t * channel){ 299 l2cap_stop_rtx(channel); 300 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 301 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 302 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 303 run_loop_add_timer(&channel->rtx); 304 } 305 306 static void l2cap_start_ertx(l2cap_channel_t * channel){ 307 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 308 l2cap_stop_rtx(channel); 309 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 310 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 311 run_loop_add_timer(&channel->rtx); 312 } 313 314 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 315 require_security_level2_for_outgoing_sdp = 1; 316 } 317 318 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 319 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 320 } 321 322 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 323 324 if (!hci_can_send_acl_packet_now(handle)){ 325 log_info("l2cap_send_signaling_packet, cannot send"); 326 return BTSTACK_ACL_BUFFERS_FULL; 327 } 328 329 // log_info("l2cap_send_signaling_packet type %u", cmd); 330 hci_reserve_packet_buffer(); 331 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 332 va_list argptr; 333 va_start(argptr, identifier); 334 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 335 va_end(argptr); 336 // log_info("l2cap_send_signaling_packet con %u!", handle); 337 return hci_send_acl_packet_buffer(len); 338 } 339 340 #ifdef HAVE_BLE 341 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 342 343 if (!hci_can_send_acl_packet_now(handle)){ 344 log_info("l2cap_send_signaling_packet, cannot send"); 345 return BTSTACK_ACL_BUFFERS_FULL; 346 } 347 348 // log_info("l2cap_send_signaling_packet type %u", cmd); 349 hci_reserve_packet_buffer(); 350 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 351 va_list argptr; 352 va_start(argptr, identifier); 353 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 354 va_end(argptr); 355 // log_info("l2cap_send_signaling_packet con %u!", handle); 356 return hci_send_acl_packet_buffer(len); 357 } 358 #endif 359 360 uint8_t *l2cap_get_outgoing_buffer(void){ 361 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 362 } 363 364 int l2cap_reserve_packet_buffer(void){ 365 return hci_reserve_packet_buffer(); 366 } 367 368 void l2cap_release_packet_buffer(void){ 369 hci_release_packet_buffer(); 370 } 371 372 373 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 374 375 if (!hci_is_packet_buffer_reserved()){ 376 log_error("l2cap_send_prepared called without reserving packet first"); 377 return BTSTACK_ACL_BUFFERS_FULL; 378 } 379 380 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 381 if (!channel) { 382 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 383 return -1; // TODO: define error 384 } 385 386 if (channel->packets_granted == 0){ 387 log_error("l2cap_send_prepared cid 0x%02x, no credits!", local_cid); 388 return -1; // TODO: define error 389 } 390 391 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 392 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 393 return BTSTACK_ACL_BUFFERS_FULL; 394 } 395 396 --channel->packets_granted; 397 398 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used, credits left %u;", 399 local_cid, channel->handle, channel->packets_granted); 400 401 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 402 403 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 404 405 // 0 - Connection handle : PB=pb : BC=00 406 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 407 // 2 - ACL length 408 bt_store_16(acl_buffer, 2, len + 4); 409 // 4 - L2CAP packet length 410 bt_store_16(acl_buffer, 4, len + 0); 411 // 6 - L2CAP channel DEST 412 bt_store_16(acl_buffer, 6, channel->remote_cid); 413 // send 414 int err = hci_send_acl_packet_buffer(len+8); 415 416 l2cap_hand_out_credits(); 417 418 return err; 419 } 420 421 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 422 423 if (!hci_is_packet_buffer_reserved()){ 424 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 425 return BTSTACK_ACL_BUFFERS_FULL; 426 } 427 428 if (!hci_can_send_prepared_acl_packet_now(handle)){ 429 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 430 return BTSTACK_ACL_BUFFERS_FULL; 431 } 432 433 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 434 435 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 436 437 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 438 439 // 0 - Connection handle : PB=pb : BC=00 440 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 441 // 2 - ACL length 442 bt_store_16(acl_buffer, 2, len + 4); 443 // 4 - L2CAP packet length 444 bt_store_16(acl_buffer, 4, len + 0); 445 // 6 - L2CAP channel DEST 446 bt_store_16(acl_buffer, 6, cid); 447 // send 448 int err = hci_send_acl_packet_buffer(len+8); 449 450 l2cap_hand_out_credits(); 451 452 return err; 453 } 454 455 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 456 457 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 458 if (!channel) { 459 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 460 return -1; // TODO: define error 461 } 462 463 if (len > channel->remote_mtu){ 464 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 465 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 466 } 467 468 if (!hci_can_send_acl_packet_now(channel->handle)){ 469 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 470 return BTSTACK_ACL_BUFFERS_FULL; 471 } 472 473 hci_reserve_packet_buffer(); 474 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 475 476 memcpy(&acl_buffer[8], data, len); 477 478 return l2cap_send_prepared(local_cid, len); 479 } 480 481 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 482 483 if (!hci_can_send_acl_packet_now(handle)){ 484 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 485 return BTSTACK_ACL_BUFFERS_FULL; 486 } 487 488 hci_reserve_packet_buffer(); 489 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 490 491 memcpy(&acl_buffer[8], data, len); 492 493 return l2cap_send_prepared_connectionless(handle, cid, len); 494 } 495 496 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 497 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 498 } 499 500 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 501 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 502 } 503 504 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 505 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 506 } 507 508 509 510 // MARK: L2CAP_RUN 511 // process outstanding signaling tasks 512 static void l2cap_run(void){ 513 514 // log_info("l2cap_run: entered"); 515 516 // check pending signaling responses 517 while (signaling_responses_pending){ 518 519 hci_con_handle_t handle = signaling_responses[0].handle; 520 521 if (!hci_can_send_acl_packet_now(handle)) break; 522 523 uint8_t sig_id = signaling_responses[0].sig_id; 524 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 525 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 526 uint8_t response_code = signaling_responses[0].code; 527 528 // remove first item before sending (to avoid sending response mutliple times) 529 signaling_responses_pending--; 530 int i; 531 for (i=0; i < signaling_responses_pending; i++){ 532 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 533 } 534 535 switch (response_code){ 536 case CONNECTION_REQUEST: 537 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 538 // also disconnect if result is 0x0003 - security blocked 539 if (result == 0x0003){ 540 hci_disconnect_security_block(handle); 541 } 542 break; 543 case ECHO_REQUEST: 544 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 545 break; 546 case INFORMATION_REQUEST: 547 switch (infoType){ 548 case 1: { // Connectionless MTU 549 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 550 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 551 break; 552 } 553 case 2: { // Extended Features Supported 554 // extended features request supported, features: fixed channels, unicast connectionless data reception 555 uint32_t features = 0x280; 556 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 557 break; 558 } 559 case 3: { // Fixed Channels Supported 560 uint8_t map[8]; 561 memset(map, 0, 8); 562 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 563 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 564 break; 565 } 566 default: 567 // all other types are not supported 568 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 569 break; 570 } 571 break; 572 case COMMAND_REJECT: 573 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 574 #ifdef HAVE_BLE 575 case COMMAND_REJECT_LE: 576 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 577 break; 578 #endif 579 default: 580 // should not happen 581 break; 582 } 583 } 584 585 uint8_t config_options[4]; 586 linked_list_iterator_t it; 587 linked_list_iterator_init(&it, &l2cap_channels); 588 while (linked_list_iterator_has_next(&it)){ 589 590 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 591 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 592 switch (channel->state){ 593 594 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 595 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 596 if (!hci_can_send_acl_packet_now(channel->handle)) break; 597 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 598 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 599 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 600 } 601 break; 602 603 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 604 if (!hci_can_send_command_packet_now()) break; 605 // send connection request - set state first 606 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 607 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 608 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 609 break; 610 611 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 612 if (!hci_can_send_acl_packet_now(channel->handle)) break; 613 channel->state = L2CAP_STATE_INVALID; 614 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 615 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 616 l2cap_stop_rtx(channel); 617 linked_list_iterator_remove(&it); 618 btstack_memory_l2cap_channel_free(channel); 619 break; 620 621 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 622 if (!hci_can_send_acl_packet_now(channel->handle)) break; 623 channel->state = L2CAP_STATE_CONFIG; 624 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 625 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 626 break; 627 628 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 629 if (!hci_can_send_acl_packet_now(channel->handle)) break; 630 // success, start l2cap handshake 631 channel->local_sig_id = l2cap_next_sig_id(); 632 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 633 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 634 l2cap_start_rtx(channel); 635 break; 636 637 case L2CAP_STATE_CONFIG: 638 if (!hci_can_send_acl_packet_now(channel->handle)) break; 639 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 640 uint16_t flags = 0; 641 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 642 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 643 flags = 1; 644 } else { 645 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 646 } 647 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 648 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 649 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 650 config_options[0] = 1; // MTU 651 config_options[1] = 2; // len param 652 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 653 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 654 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 655 } else { 656 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 657 } 658 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 659 } 660 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 661 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 662 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 663 channel->local_sig_id = l2cap_next_sig_id(); 664 config_options[0] = 1; // MTU 665 config_options[1] = 2; // len param 666 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 667 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 668 l2cap_start_rtx(channel); 669 } 670 if (l2cap_channel_ready_for_open(channel)){ 671 channel->state = L2CAP_STATE_OPEN; 672 l2cap_emit_channel_opened(channel, 0); // success 673 l2cap_emit_credits(channel, 1); 674 } 675 break; 676 677 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 678 if (!hci_can_send_acl_packet_now(channel->handle)) break; 679 channel->state = L2CAP_STATE_INVALID; 680 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 681 // 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 :) 682 l2cap_finialize_channel_close(channel); // -- remove from list 683 break; 684 685 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 686 if (!hci_can_send_acl_packet_now(channel->handle)) break; 687 channel->local_sig_id = l2cap_next_sig_id(); 688 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 689 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 690 break; 691 default: 692 break; 693 } 694 } 695 696 #ifdef HAVE_BLE 697 // send l2cap con paramter update if necessary 698 hci_connections_get_iterator(&it); 699 while(linked_list_iterator_has_next(&it)){ 700 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 701 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 702 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 703 switch (connection->le_con_parameter_update_state){ 704 case CON_PARAMETER_UPDATE_SEND_REQUEST: 705 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 706 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 707 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 708 break; 709 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 710 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 711 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 712 break; 713 case CON_PARAMETER_UPDATE_DENY: 714 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 715 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 716 break; 717 default: 718 break; 719 } 720 } 721 #endif 722 723 // log_info("l2cap_run: exit"); 724 } 725 726 uint16_t l2cap_max_mtu(void){ 727 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 728 } 729 730 uint16_t l2cap_max_le_mtu(void){ 731 return l2cap_max_mtu(); 732 } 733 734 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 735 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 736 log_info("l2cap_handle_connection_complete expected state"); 737 // success, start l2cap handshake 738 channel->handle = handle; 739 // check remote SSP feature first 740 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 741 } 742 } 743 744 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 745 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 746 747 // we have been waiting for remote supported features, if both support SSP, 748 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)); 749 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 750 // request security level 2 751 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 752 gap_request_security_level(channel->handle, LEVEL_2); 753 return; 754 } 755 // fine, go ahead 756 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 757 } 758 759 /** 760 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 761 * @param packet_handler 762 * @param address 763 * @param psm 764 * @param mtu 765 * @param local_cid 766 */ 767 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){ 768 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 769 770 // alloc structure 771 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 772 if (!chan) { 773 return BTSTACK_MEMORY_ALLOC_FAILED; 774 } 775 776 // Init memory (make valgrind happy) 777 memset(chan, 0, sizeof(l2cap_channel_t)); 778 // limit local mtu to max acl packet length - l2cap header 779 if (mtu > l2cap_max_mtu()) { 780 mtu = l2cap_max_mtu(); 781 } 782 783 // fill in 784 BD_ADDR_COPY(chan->address, address); 785 chan->psm = psm; 786 chan->handle = 0; 787 chan->packet_handler = channel_packet_handler; 788 chan->remote_mtu = L2CAP_MINIMAL_MTU; 789 chan->local_mtu = mtu; 790 chan->packets_granted = 0; 791 chan->local_cid = l2cap_next_local_cid(); 792 793 // set initial state 794 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 795 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 796 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 797 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 798 chan->required_security_level = LEVEL_0; 799 800 // add to connections list 801 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 802 803 // store local_cid 804 if (out_local_cid){ 805 *out_local_cid = chan->local_cid; 806 } 807 808 // check if hci connection is already usable 809 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 810 if (conn){ 811 log_info("l2cap_create_channel_internal, hci connection already exists"); 812 l2cap_handle_connection_complete(conn->con_handle, chan); 813 // check if remote supported fearures are already received 814 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 815 l2cap_handle_remote_supported_features_received(chan); 816 } 817 } 818 819 l2cap_run(); 820 821 return 0; 822 } 823 824 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 825 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 826 // find channel for local_cid 827 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 828 if (channel) { 829 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 830 } 831 // process 832 l2cap_run(); 833 } 834 835 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 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) != 0) continue; 841 // channel for this address found 842 switch (channel->state){ 843 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 844 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 845 // failure, forward error code 846 l2cap_emit_channel_opened(channel, status); 847 // discard channel 848 l2cap_stop_rtx(channel); 849 linked_list_iterator_remove(&it); 850 btstack_memory_l2cap_channel_free(channel); 851 break; 852 default: 853 break; 854 } 855 } 856 } 857 858 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 859 linked_list_iterator_t it; 860 linked_list_iterator_init(&it, &l2cap_channels); 861 while (linked_list_iterator_has_next(&it)){ 862 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 863 if ( ! BD_ADDR_CMP( channel->address, address) ){ 864 l2cap_handle_connection_complete(handle, channel); 865 } 866 } 867 // process 868 l2cap_run(); 869 } 870 871 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 872 873 bd_addr_t address; 874 hci_con_handle_t handle; 875 linked_list_iterator_t it; 876 int hci_con_used; 877 878 switch(packet[0]){ 879 880 // handle connection complete events 881 case HCI_EVENT_CONNECTION_COMPLETE: 882 bt_flip_addr(address, &packet[5]); 883 if (packet[2] == 0){ 884 handle = READ_BT_16(packet, 3); 885 l2cap_handle_connection_success_for_addr(address, handle); 886 } else { 887 l2cap_handle_connection_failed_for_addr(address, packet[2]); 888 } 889 break; 890 891 // handle successful create connection cancel command 892 case HCI_EVENT_COMMAND_COMPLETE: 893 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 894 if (packet[5] == 0){ 895 bt_flip_addr(address, &packet[6]); 896 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 897 l2cap_handle_connection_failed_for_addr(address, 0x16); 898 } 899 } 900 l2cap_run(); // try sending signaling packets first 901 break; 902 903 case HCI_EVENT_COMMAND_STATUS: 904 l2cap_run(); // try sending signaling packets first 905 break; 906 907 // handle disconnection complete events 908 case HCI_EVENT_DISCONNECTION_COMPLETE: 909 // send l2cap disconnect events for all channels on this handle and free them 910 handle = READ_BT_16(packet, 3); 911 linked_list_iterator_init(&it, &l2cap_channels); 912 while (linked_list_iterator_has_next(&it)){ 913 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 914 if (channel->handle != handle) continue; 915 l2cap_emit_channel_closed(channel); 916 l2cap_stop_rtx(channel); 917 linked_list_iterator_remove(&it); 918 btstack_memory_l2cap_channel_free(channel); 919 } 920 break; 921 922 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 923 l2cap_run(); // try sending signaling packets first 924 l2cap_hand_out_credits(); 925 break; 926 927 // HCI Connection Timeouts 928 case L2CAP_EVENT_TIMEOUT_CHECK: 929 handle = READ_BT_16(packet, 2); 930 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 931 if (hci_authentication_active_for_handle(handle)) break; 932 hci_con_used = 0; 933 linked_list_iterator_init(&it, &l2cap_channels); 934 while (linked_list_iterator_has_next(&it)){ 935 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 936 if (channel->handle != handle) continue; 937 hci_con_used = 1; 938 break; 939 } 940 if (hci_con_used) break; 941 if (!hci_can_send_command_packet_now()) break; 942 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 943 break; 944 945 case DAEMON_EVENT_HCI_PACKET_SENT: 946 linked_list_iterator_init(&it, &l2cap_channels); 947 while (linked_list_iterator_has_next(&it)){ 948 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 949 if (!channel->packet_handler) continue; 950 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 951 } 952 if (attribute_protocol_packet_handler) { 953 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 954 } 955 if (security_protocol_packet_handler) { 956 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 957 } 958 if (connectionless_channel_packet_handler) { 959 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 960 } 961 break; 962 963 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 964 handle = READ_BT_16(packet, 3); 965 linked_list_iterator_init(&it, &l2cap_channels); 966 while (linked_list_iterator_has_next(&it)){ 967 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 968 if (channel->handle != handle) continue; 969 l2cap_handle_remote_supported_features_received(channel); 970 break; 971 } 972 break; 973 974 case GAP_SECURITY_LEVEL: 975 handle = READ_BT_16(packet, 2); 976 log_info("l2cap - security level update"); 977 linked_list_iterator_init(&it, &l2cap_channels); 978 while (linked_list_iterator_has_next(&it)){ 979 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 980 if (channel->handle != handle) continue; 981 982 log_info("l2cap - state %u", channel->state); 983 984 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 985 gap_security_level_t required_level = channel->required_security_level; 986 987 switch (channel->state){ 988 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 989 if (actual_level >= required_level){ 990 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 991 l2cap_emit_connection_request(channel); 992 } else { 993 channel->reason = 0x0003; // security block 994 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 995 } 996 break; 997 998 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 999 if (actual_level >= required_level){ 1000 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1001 } else { 1002 // disconnnect, authentication not good enough 1003 hci_disconnect_security_block(handle); 1004 } 1005 break; 1006 1007 default: 1008 break; 1009 } 1010 } 1011 break; 1012 1013 default: 1014 break; 1015 } 1016 1017 // pass on: main packet handler, att and sm packet handlers 1018 (*packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1019 if (attribute_protocol_packet_handler){ 1020 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1021 } 1022 if (security_protocol_packet_handler) { 1023 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1024 } 1025 if (connectionless_channel_packet_handler) { 1026 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1027 } 1028 1029 l2cap_run(); 1030 } 1031 1032 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1033 channel->remote_sig_id = identifier; 1034 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1035 l2cap_run(); 1036 } 1037 1038 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1039 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1040 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1041 signaling_responses[signaling_responses_pending].handle = handle; 1042 signaling_responses[signaling_responses_pending].code = code; 1043 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1044 signaling_responses[signaling_responses_pending].data = data; 1045 signaling_responses_pending++; 1046 l2cap_run(); 1047 } 1048 } 1049 1050 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1051 1052 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1053 l2cap_service_t *service = l2cap_get_service(psm); 1054 if (!service) { 1055 // 0x0002 PSM not supported 1056 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1057 return; 1058 } 1059 1060 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1061 if (!hci_connection) { 1062 // 1063 log_error("no hci_connection for handle %u", handle); 1064 return; 1065 } 1066 1067 // alloc structure 1068 // log_info("l2cap_handle_connection_request register channel"); 1069 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1070 if (!channel){ 1071 // 0x0004 No resources available 1072 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1073 return; 1074 } 1075 // Init memory (make valgrind happy) 1076 memset(channel, 0, sizeof(l2cap_channel_t)); 1077 // fill in 1078 BD_ADDR_COPY(channel->address, hci_connection->address); 1079 channel->psm = psm; 1080 channel->handle = handle; 1081 channel->packet_handler = service->packet_handler; 1082 channel->local_cid = l2cap_next_local_cid(); 1083 channel->remote_cid = source_cid; 1084 channel->local_mtu = service->mtu; 1085 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1086 channel->packets_granted = 0; 1087 channel->remote_sig_id = sig_id; 1088 channel->required_security_level = service->required_security_level; 1089 1090 // limit local mtu to max acl packet length - l2cap header 1091 if (channel->local_mtu > l2cap_max_mtu()) { 1092 channel->local_mtu = l2cap_max_mtu(); 1093 } 1094 1095 // set initial state 1096 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1097 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1098 1099 // add to connections list 1100 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1101 1102 // assert security requirements 1103 gap_request_security_level(handle, channel->required_security_level); 1104 } 1105 1106 void l2cap_accept_connection_internal(uint16_t local_cid){ 1107 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1108 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1109 if (!channel) { 1110 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1111 return; 1112 } 1113 1114 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1115 1116 // process 1117 l2cap_run(); 1118 } 1119 1120 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1121 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1122 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1123 if (!channel) { 1124 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1125 return; 1126 } 1127 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1128 channel->reason = reason; 1129 l2cap_run(); 1130 } 1131 1132 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1133 1134 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1135 1136 uint16_t flags = READ_BT_16(command, 6); 1137 if (flags & 1) { 1138 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1139 } 1140 1141 // accept the other's configuration options 1142 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1143 uint16_t pos = 8; 1144 while (pos < end_pos){ 1145 uint8_t option_hint = command[pos] >> 7; 1146 uint8_t option_type = command[pos] & 0x7f; 1147 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1148 pos++; 1149 uint8_t length = command[pos++]; 1150 // MTU { type(8): 1, len(8):2, MTU(16) } 1151 if (option_type == 1 && length == 2){ 1152 channel->remote_mtu = READ_BT_16(command, pos); 1153 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1154 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1155 } 1156 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1157 if (option_type == 2 && length == 2){ 1158 channel->flush_timeout = READ_BT_16(command, pos); 1159 } 1160 // check for unknown options 1161 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1162 log_info("l2cap cid %u, unknown options", channel->local_cid); 1163 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1164 } 1165 pos += length; 1166 } 1167 } 1168 1169 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1170 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1171 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1172 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1173 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1174 if (channel->state == L2CAP_STATE_OPEN) return 0; 1175 return 1; 1176 } 1177 1178 1179 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1180 1181 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1182 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1183 uint16_t result = 0; 1184 1185 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1186 1187 // handle DISCONNECT REQUESTS seperately 1188 if (code == DISCONNECTION_REQUEST){ 1189 switch (channel->state){ 1190 case L2CAP_STATE_CONFIG: 1191 case L2CAP_STATE_OPEN: 1192 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1193 case L2CAP_STATE_WAIT_DISCONNECT: 1194 l2cap_handle_disconnect_request(channel, identifier); 1195 break; 1196 1197 default: 1198 // ignore in other states 1199 break; 1200 } 1201 return; 1202 } 1203 1204 // @STATEMACHINE(l2cap) 1205 switch (channel->state) { 1206 1207 case L2CAP_STATE_WAIT_CONNECT_RSP: 1208 switch (code){ 1209 case CONNECTION_RESPONSE: 1210 l2cap_stop_rtx(channel); 1211 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1212 switch (result) { 1213 case 0: 1214 // successful connection 1215 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1216 channel->state = L2CAP_STATE_CONFIG; 1217 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1218 break; 1219 case 1: 1220 // connection pending. get some coffee, but start the ERTX 1221 l2cap_start_ertx(channel); 1222 break; 1223 default: 1224 // channel closed 1225 channel->state = L2CAP_STATE_CLOSED; 1226 // map l2cap connection response result to BTstack status enumeration 1227 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1228 1229 // drop link key if security block 1230 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1231 hci_drop_link_key_for_bd_addr(channel->address); 1232 } 1233 1234 // discard channel 1235 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1236 btstack_memory_l2cap_channel_free(channel); 1237 break; 1238 } 1239 break; 1240 1241 default: 1242 //@TODO: implement other signaling packets 1243 break; 1244 } 1245 break; 1246 1247 case L2CAP_STATE_CONFIG: 1248 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1249 switch (code) { 1250 case CONFIGURE_REQUEST: 1251 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1252 l2cap_signaling_handle_configure_request(channel, command); 1253 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1254 // only done if continuation not set 1255 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1256 } 1257 break; 1258 case CONFIGURE_RESPONSE: 1259 l2cap_stop_rtx(channel); 1260 switch (result){ 1261 case 0: // success 1262 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1263 break; 1264 case 4: // pending 1265 l2cap_start_ertx(channel); 1266 break; 1267 default: 1268 // retry on negative result 1269 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1270 break; 1271 } 1272 break; 1273 default: 1274 break; 1275 } 1276 if (l2cap_channel_ready_for_open(channel)){ 1277 // for open: 1278 channel->state = L2CAP_STATE_OPEN; 1279 l2cap_emit_channel_opened(channel, 0); 1280 l2cap_emit_credits(channel, 1); 1281 } 1282 break; 1283 1284 case L2CAP_STATE_WAIT_DISCONNECT: 1285 switch (code) { 1286 case DISCONNECTION_RESPONSE: 1287 l2cap_finialize_channel_close(channel); 1288 break; 1289 default: 1290 //@TODO: implement other signaling packets 1291 break; 1292 } 1293 break; 1294 1295 case L2CAP_STATE_CLOSED: 1296 // @TODO handle incoming requests 1297 break; 1298 1299 case L2CAP_STATE_OPEN: 1300 //@TODO: implement other signaling packets, e.g. re-configure 1301 break; 1302 default: 1303 break; 1304 } 1305 // log_info("new state %u", channel->state); 1306 } 1307 1308 1309 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1310 1311 // get code, signalind identifier and command len 1312 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1313 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1314 1315 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1316 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1317 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1318 return; 1319 } 1320 1321 // general commands without an assigned channel 1322 switch(code) { 1323 1324 case CONNECTION_REQUEST: { 1325 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1326 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1327 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1328 return; 1329 } 1330 1331 case ECHO_REQUEST: 1332 l2cap_register_signaling_response(handle, code, sig_id, 0); 1333 return; 1334 1335 case INFORMATION_REQUEST: { 1336 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1337 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1338 return; 1339 } 1340 1341 default: 1342 break; 1343 } 1344 1345 1346 // Get potential destination CID 1347 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1348 1349 // Find channel for this sig_id and connection handle 1350 linked_list_iterator_t it; 1351 linked_list_iterator_init(&it, &l2cap_channels); 1352 while (linked_list_iterator_has_next(&it)){ 1353 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1354 if (channel->handle != handle) continue; 1355 if (code & 1) { 1356 // match odd commands (responses) by previous signaling identifier 1357 if (channel->local_sig_id == sig_id) { 1358 l2cap_signaling_handler_channel(channel, command); 1359 break; 1360 } 1361 } else { 1362 // match even commands (requests) by local channel id 1363 if (channel->local_cid == dest_cid) { 1364 l2cap_signaling_handler_channel(channel, command); 1365 break; 1366 } 1367 } 1368 } 1369 } 1370 1371 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1372 1373 // Get Channel ID 1374 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1375 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1376 1377 switch (channel_id) { 1378 1379 case L2CAP_CID_SIGNALING: { 1380 1381 uint16_t command_offset = 8; 1382 while (command_offset < size) { 1383 1384 // handle signaling commands 1385 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1386 1387 // increment command_offset 1388 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1389 } 1390 break; 1391 } 1392 1393 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1394 if (attribute_protocol_packet_handler) { 1395 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1396 } 1397 break; 1398 1399 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1400 if (security_protocol_packet_handler) { 1401 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1402 } 1403 break; 1404 1405 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1406 if (connectionless_channel_packet_handler) { 1407 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1408 } 1409 break; 1410 1411 case L2CAP_CID_SIGNALING_LE: { 1412 switch (packet[8]){ 1413 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1414 uint16_t result = READ_BT_16(packet, 12); 1415 l2cap_emit_connection_parameter_update_response(handle, result); 1416 break; 1417 } 1418 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1419 uint8_t event[10]; 1420 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1421 event[1] = 8; 1422 memcpy(&event[2], &packet[12], 8); 1423 1424 hci_connection_t * connection = hci_connection_for_handle(handle); 1425 if (connection){ 1426 if (connection->role != HCI_ROLE_MASTER){ 1427 // reject command without notifying upper layer when not in master role 1428 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1429 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1430 break; 1431 } 1432 int update_parameter = 1; 1433 le_connection_parameter_range_t existing_range; 1434 gap_le_get_connection_parameter_range(existing_range); 1435 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1436 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1437 uint16_t le_conn_latency = READ_BT_16(packet,16); 1438 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1439 1440 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1441 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1442 1443 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1444 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1445 1446 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1447 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1448 1449 if (update_parameter){ 1450 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1451 connection->le_conn_interval_min = le_conn_interval_min; 1452 connection->le_conn_interval_max = le_conn_interval_max; 1453 connection->le_conn_latency = le_conn_latency; 1454 connection->le_supervision_timeout = le_supervision_timeout; 1455 } else { 1456 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1457 } 1458 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1459 } 1460 1461 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1462 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1463 1464 break; 1465 } 1466 default: { 1467 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1468 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1469 break; 1470 } 1471 } 1472 break; 1473 } 1474 1475 default: { 1476 // Find channel for this channel_id and connection handle 1477 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1478 if (channel) { 1479 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1480 } 1481 break; 1482 } 1483 } 1484 } 1485 1486 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1487 switch (packet_type) { 1488 case HCI_EVENT_PACKET: 1489 l2cap_event_handler(packet, size); 1490 break; 1491 case HCI_ACL_DATA_PACKET: 1492 l2cap_acl_handler(packet, size); 1493 break; 1494 default: 1495 break; 1496 } 1497 l2cap_run(); 1498 } 1499 1500 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1501 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1502 channel->state = L2CAP_STATE_CLOSED; 1503 l2cap_emit_channel_closed(channel); 1504 // discard channel 1505 l2cap_stop_rtx(channel); 1506 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1507 btstack_memory_l2cap_channel_free(channel); 1508 } 1509 1510 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1511 linked_list_iterator_t it; 1512 linked_list_iterator_init(&it, services); 1513 while (linked_list_iterator_has_next(&it)){ 1514 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1515 if ( service->psm == psm){ 1516 return service; 1517 }; 1518 } 1519 return NULL; 1520 } 1521 1522 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1523 return l2cap_get_service_internal(&l2cap_services, psm); 1524 } 1525 1526 1527 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1528 1529 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1530 1531 // check for alread registered psm 1532 // TODO: emit error event 1533 l2cap_service_t *service = l2cap_get_service(psm); 1534 if (service) { 1535 log_error("l2cap_register_service: PSM %u already registered", psm); 1536 return L2CAP_SERVICE_ALREADY_REGISTERED; 1537 } 1538 1539 // alloc structure 1540 // TODO: emit error event 1541 service = btstack_memory_l2cap_service_get(); 1542 if (!service) { 1543 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1544 return BTSTACK_MEMORY_ALLOC_FAILED; 1545 } 1546 1547 // fill in 1548 service->psm = psm; 1549 service->mtu = mtu; 1550 service->packet_handler = service_packet_handler; 1551 service->required_security_level = security_level; 1552 1553 // add to services list 1554 linked_list_add(&l2cap_services, (linked_item_t *) service); 1555 1556 // enable page scan 1557 hci_connectable_control(1); 1558 1559 return 0; 1560 } 1561 1562 void l2cap_unregister_service(uint16_t psm){ 1563 1564 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1565 1566 l2cap_service_t *service = l2cap_get_service(psm); 1567 if (!service) return; 1568 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1569 btstack_memory_l2cap_service_free(service); 1570 1571 // disable page scan when no services registered 1572 if (!linked_list_empty(&l2cap_services)) return; 1573 hci_connectable_control(0); 1574 } 1575 1576 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1577 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1578 switch(channel_id){ 1579 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1580 attribute_protocol_packet_handler = the_packet_handler; 1581 break; 1582 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1583 security_protocol_packet_handler = the_packet_handler; 1584 break; 1585 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1586 connectionless_channel_packet_handler = the_packet_handler; 1587 break; 1588 } 1589 } 1590 1591 #ifdef HAVE_BLE 1592 1593 1594 #if 0 1595 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1596 return l2cap_get_service_internal(&l2cap_le_services, psm); 1597 } 1598 /** 1599 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1600 * @param 1601 */ 1602 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1603 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1604 1605 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1606 1607 // check for alread registered psm 1608 // TODO: emit error event 1609 l2cap_service_t *service = l2cap_le_get_service(psm); 1610 if (service) { 1611 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1612 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1613 return; 1614 } 1615 1616 // alloc structure 1617 // TODO: emit error event 1618 service = btstack_memory_l2cap_service_get(); 1619 if (!service) { 1620 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1621 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1622 return; 1623 } 1624 1625 // fill in 1626 service->psm = psm; 1627 service->mtu = mtu; 1628 service->mps = mps; 1629 service->packet_handler = packet_handler; 1630 service->required_security_level = security_level; 1631 1632 // add to services list 1633 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1634 1635 // done 1636 l2cap_emit_service_registered(connection, 0, psm); 1637 } 1638 1639 void l2cap_le_unregister_service(uint16_t psm) { 1640 1641 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1642 1643 l2cap_service_t *service = l2cap_le_get_service(psm); 1644 if (!service) return; 1645 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1646 btstack_memory_l2cap_service_free(service); 1647 } 1648 #endif 1649 #endif 1650