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 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(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 123 } 124 void l2cap_register_packet_handler(void (*handler)(void * connection, 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)(channel->connection, 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)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 190 } 191 192 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 193 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 194 uint8_t event[5]; 195 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 196 event[1] = sizeof(event) - 2; 197 event[2] = status; 198 bt_store_16(event, 3, psm); 199 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 200 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 201 } 202 203 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 204 205 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 206 207 uint8_t event[5]; 208 event[0] = L2CAP_EVENT_CREDITS; 209 event[1] = sizeof(event) - 2; 210 bt_store_16(event, 2, channel->local_cid); 211 event[4] = credits; 212 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 213 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 214 } 215 216 void l2cap_block_new_credits(uint8_t blocked){ 217 new_credits_blocked = blocked; 218 } 219 220 static void l2cap_hand_out_credits(void){ 221 222 if (new_credits_blocked) return; // we're told not to. used by daemon 223 224 linked_list_iterator_t it; 225 linked_list_iterator_init(&it, &l2cap_channels); 226 while (linked_list_iterator_has_next(&it)){ 227 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 228 if (channel->state != L2CAP_STATE_OPEN) continue; 229 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 230 l2cap_emit_credits(channel, 1); 231 } 232 } 233 234 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 235 linked_list_iterator_t it; 236 linked_list_iterator_init(&it, &l2cap_channels); 237 while (linked_list_iterator_has_next(&it)){ 238 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 239 if ( channel->local_cid == local_cid) { 240 return channel; 241 } 242 } 243 return NULL; 244 } 245 246 int l2cap_can_send_packet_now(uint16_t local_cid){ 247 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 248 if (!channel) return 0; 249 return hci_can_send_acl_packet_now(channel->handle); 250 } 251 252 // @deprecated 253 int l2cap_can_send_connectionless_packet_now(void){ 254 // TODO provide real handle 255 return l2cap_can_send_fixed_channel_packet_now(0x1234); 256 } 257 258 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 259 return hci_can_send_acl_packet_now(handle); 260 } 261 262 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 263 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 264 if (channel) { 265 return channel->remote_mtu; 266 } 267 return 0; 268 } 269 270 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 271 linked_list_iterator_t it; 272 linked_list_iterator_init(&it, &l2cap_channels); 273 while (linked_list_iterator_has_next(&it)){ 274 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 275 if ( &channel->rtx == ts) { 276 return channel; 277 } 278 } 279 return NULL; 280 } 281 282 static void l2cap_rtx_timeout(timer_source_t * ts){ 283 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 284 if (!ts) return; 285 286 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 287 288 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 289 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 290 // notify client 291 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 292 293 // discard channel 294 // no need to stop timer here, it is removed from list during timer callback 295 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 296 btstack_memory_l2cap_channel_free(channel); 297 } 298 299 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 300 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 301 run_loop_remove_timer(&channel->rtx); 302 } 303 304 static void l2cap_start_rtx(l2cap_channel_t * channel){ 305 l2cap_stop_rtx(channel); 306 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 307 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 308 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 309 run_loop_add_timer(&channel->rtx); 310 } 311 312 static void l2cap_start_ertx(l2cap_channel_t * channel){ 313 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 314 l2cap_stop_rtx(channel); 315 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 316 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 317 run_loop_add_timer(&channel->rtx); 318 } 319 320 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 321 require_security_level2_for_outgoing_sdp = 1; 322 } 323 324 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 325 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 326 } 327 328 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 329 330 if (!hci_can_send_acl_packet_now(handle)){ 331 log_info("l2cap_send_signaling_packet, cannot send"); 332 return BTSTACK_ACL_BUFFERS_FULL; 333 } 334 335 // log_info("l2cap_send_signaling_packet type %u", cmd); 336 hci_reserve_packet_buffer(); 337 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 338 va_list argptr; 339 va_start(argptr, identifier); 340 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 341 va_end(argptr); 342 // log_info("l2cap_send_signaling_packet con %u!", handle); 343 return hci_send_acl_packet_buffer(len); 344 } 345 346 #ifdef HAVE_BLE 347 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 348 349 if (!hci_can_send_acl_packet_now(handle)){ 350 log_info("l2cap_send_signaling_packet, cannot send"); 351 return BTSTACK_ACL_BUFFERS_FULL; 352 } 353 354 // log_info("l2cap_send_signaling_packet type %u", cmd); 355 hci_reserve_packet_buffer(); 356 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 357 va_list argptr; 358 va_start(argptr, identifier); 359 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 360 va_end(argptr); 361 // log_info("l2cap_send_signaling_packet con %u!", handle); 362 return hci_send_acl_packet_buffer(len); 363 } 364 #endif 365 366 uint8_t *l2cap_get_outgoing_buffer(void){ 367 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 368 } 369 370 int l2cap_reserve_packet_buffer(void){ 371 return hci_reserve_packet_buffer(); 372 } 373 374 void l2cap_release_packet_buffer(void){ 375 hci_release_packet_buffer(); 376 } 377 378 379 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 380 381 if (!hci_is_packet_buffer_reserved()){ 382 log_error("l2cap_send_prepared called without reserving packet first"); 383 return BTSTACK_ACL_BUFFERS_FULL; 384 } 385 386 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 387 if (!channel) { 388 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 389 return -1; // TODO: define error 390 } 391 392 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 393 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 394 return BTSTACK_ACL_BUFFERS_FULL; 395 } 396 397 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 398 399 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 400 401 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 402 403 // 0 - Connection handle : PB=pb : BC=00 404 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 405 // 2 - ACL length 406 bt_store_16(acl_buffer, 2, len + 4); 407 // 4 - L2CAP packet length 408 bt_store_16(acl_buffer, 4, len + 0); 409 // 6 - L2CAP channel DEST 410 bt_store_16(acl_buffer, 6, channel->remote_cid); 411 // send 412 int err = hci_send_acl_packet_buffer(len+8); 413 414 l2cap_hand_out_credits(); 415 416 return err; 417 } 418 419 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 420 421 if (!hci_is_packet_buffer_reserved()){ 422 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 423 return BTSTACK_ACL_BUFFERS_FULL; 424 } 425 426 if (!hci_can_send_prepared_acl_packet_now(handle)){ 427 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 428 return BTSTACK_ACL_BUFFERS_FULL; 429 } 430 431 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 432 433 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 434 435 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 436 437 // 0 - Connection handle : PB=pb : BC=00 438 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 439 // 2 - ACL length 440 bt_store_16(acl_buffer, 2, len + 4); 441 // 4 - L2CAP packet length 442 bt_store_16(acl_buffer, 4, len + 0); 443 // 6 - L2CAP channel DEST 444 bt_store_16(acl_buffer, 6, cid); 445 // send 446 int err = hci_send_acl_packet_buffer(len+8); 447 448 l2cap_hand_out_credits(); 449 450 return err; 451 } 452 453 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 454 455 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 456 if (!channel) { 457 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 458 return -1; // TODO: define error 459 } 460 461 if (len > channel->remote_mtu){ 462 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 463 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 464 } 465 466 if (!hci_can_send_acl_packet_now(channel->handle)){ 467 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 468 return BTSTACK_ACL_BUFFERS_FULL; 469 } 470 471 hci_reserve_packet_buffer(); 472 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 473 474 memcpy(&acl_buffer[8], data, len); 475 476 return l2cap_send_prepared(local_cid, len); 477 } 478 479 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 480 481 if (!hci_can_send_acl_packet_now(handle)){ 482 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 483 return BTSTACK_ACL_BUFFERS_FULL; 484 } 485 486 hci_reserve_packet_buffer(); 487 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 488 489 memcpy(&acl_buffer[8], data, len); 490 491 return l2cap_send_prepared_connectionless(handle, cid, len); 492 } 493 494 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 495 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 496 } 497 498 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 499 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 500 } 501 502 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 503 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 504 } 505 506 507 508 // MARK: L2CAP_RUN 509 // process outstanding signaling tasks 510 static void l2cap_run(void){ 511 512 // log_info("l2cap_run: entered"); 513 514 // check pending signaling responses 515 while (signaling_responses_pending){ 516 517 hci_con_handle_t handle = signaling_responses[0].handle; 518 519 if (!hci_can_send_acl_packet_now(handle)) break; 520 521 uint8_t sig_id = signaling_responses[0].sig_id; 522 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 523 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 524 uint8_t response_code = signaling_responses[0].code; 525 526 // remove first item before sending (to avoid sending response mutliple times) 527 signaling_responses_pending--; 528 int i; 529 for (i=0; i < signaling_responses_pending; i++){ 530 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 531 } 532 533 switch (response_code){ 534 case CONNECTION_REQUEST: 535 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 536 // also disconnect if result is 0x0003 - security blocked 537 if (result == 0x0003){ 538 hci_disconnect_security_block(handle); 539 } 540 break; 541 case ECHO_REQUEST: 542 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 543 break; 544 case INFORMATION_REQUEST: 545 switch (infoType){ 546 case 1: { // Connectionless MTU 547 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 548 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 549 break; 550 } 551 case 2: { // Extended Features Supported 552 // extended features request supported, features: fixed channels, unicast connectionless data reception 553 uint32_t features = 0x280; 554 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 555 break; 556 } 557 case 3: { // Fixed Channels Supported 558 uint8_t map[8]; 559 memset(map, 0, 8); 560 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 561 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 562 break; 563 } 564 default: 565 // all other types are not supported 566 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 567 break; 568 } 569 break; 570 case COMMAND_REJECT: 571 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 572 #ifdef HAVE_BLE 573 case COMMAND_REJECT_LE: 574 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 575 break; 576 #endif 577 default: 578 // should not happen 579 break; 580 } 581 } 582 583 uint8_t config_options[4]; 584 linked_list_iterator_t it; 585 linked_list_iterator_init(&it, &l2cap_channels); 586 while (linked_list_iterator_has_next(&it)){ 587 588 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 589 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 590 switch (channel->state){ 591 592 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 593 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 594 if (!hci_can_send_acl_packet_now(channel->handle)) break; 595 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 596 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 597 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 598 } 599 break; 600 601 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 602 if (!hci_can_send_command_packet_now()) break; 603 // send connection request - set state first 604 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 605 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 606 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 607 break; 608 609 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 610 if (!hci_can_send_acl_packet_now(channel->handle)) break; 611 channel->state = L2CAP_STATE_INVALID; 612 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 613 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 614 l2cap_stop_rtx(channel); 615 linked_list_iterator_remove(&it); 616 btstack_memory_l2cap_channel_free(channel); 617 break; 618 619 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 620 if (!hci_can_send_acl_packet_now(channel->handle)) break; 621 channel->state = L2CAP_STATE_CONFIG; 622 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 623 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 624 break; 625 626 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 627 if (!hci_can_send_acl_packet_now(channel->handle)) break; 628 // success, start l2cap handshake 629 channel->local_sig_id = l2cap_next_sig_id(); 630 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 631 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 632 l2cap_start_rtx(channel); 633 break; 634 635 case L2CAP_STATE_CONFIG: 636 if (!hci_can_send_acl_packet_now(channel->handle)) break; 637 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 638 uint16_t flags = 0; 639 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 640 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 641 flags = 1; 642 } else { 643 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 644 } 645 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 646 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 647 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 648 config_options[0] = 1; // MTU 649 config_options[1] = 2; // len param 650 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 651 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 652 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 653 } else { 654 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 655 } 656 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 657 } 658 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 659 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 660 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 661 channel->local_sig_id = l2cap_next_sig_id(); 662 config_options[0] = 1; // MTU 663 config_options[1] = 2; // len param 664 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 665 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 666 l2cap_start_rtx(channel); 667 } 668 if (l2cap_channel_ready_for_open(channel)){ 669 channel->state = L2CAP_STATE_OPEN; 670 l2cap_emit_channel_opened(channel, 0); // success 671 l2cap_emit_credits(channel, 1); 672 } 673 break; 674 675 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 676 if (!hci_can_send_acl_packet_now(channel->handle)) break; 677 channel->state = L2CAP_STATE_INVALID; 678 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 679 // 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 :) 680 l2cap_finialize_channel_close(channel); // -- remove from list 681 break; 682 683 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 684 if (!hci_can_send_acl_packet_now(channel->handle)) break; 685 channel->local_sig_id = l2cap_next_sig_id(); 686 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 687 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 688 break; 689 default: 690 break; 691 } 692 } 693 694 #ifdef HAVE_BLE 695 // send l2cap con paramter update if necessary 696 hci_connections_get_iterator(&it); 697 while(linked_list_iterator_has_next(&it)){ 698 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 699 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 700 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 701 switch (connection->le_con_parameter_update_state){ 702 case CON_PARAMETER_UPDATE_SEND_REQUEST: 703 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 704 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 705 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 706 break; 707 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 708 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 709 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 710 break; 711 case CON_PARAMETER_UPDATE_DENY: 712 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 713 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 714 break; 715 default: 716 break; 717 } 718 } 719 #endif 720 721 // log_info("l2cap_run: exit"); 722 } 723 724 uint16_t l2cap_max_mtu(void){ 725 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 726 } 727 728 uint16_t l2cap_max_le_mtu(void){ 729 return l2cap_max_mtu(); 730 } 731 732 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 733 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 734 log_info("l2cap_handle_connection_complete expected state"); 735 // success, start l2cap handshake 736 channel->handle = handle; 737 channel->local_cid = l2cap_next_local_cid(); 738 // check remote SSP feature first 739 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 740 } 741 } 742 743 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 744 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 745 746 // we have been waiting for remote supported features, if both support SSP, 747 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)); 748 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 749 // request security level 2 750 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 751 gap_request_security_level(channel->handle, LEVEL_2); 752 return; 753 } 754 // fine, go ahead 755 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 756 } 757 758 // open outgoing L2CAP channel 759 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t channel_packet_handler, 760 bd_addr_t address, uint16_t psm, uint16_t mtu){ 761 762 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 763 764 // alloc structure 765 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 766 if (!chan) { 767 // emit error event 768 l2cap_channel_t dummy_channel; 769 BD_ADDR_COPY(dummy_channel.address, address); 770 dummy_channel.psm = psm; 771 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 772 return; 773 } 774 // Init memory (make valgrind happy) 775 memset(chan, 0, sizeof(l2cap_channel_t)); 776 // limit local mtu to max acl packet length - l2cap header 777 if (mtu > l2cap_max_mtu()) { 778 mtu = l2cap_max_mtu(); 779 } 780 781 // fill in 782 BD_ADDR_COPY(chan->address, address); 783 chan->psm = psm; 784 chan->handle = 0; 785 chan->connection = connection; 786 chan->packet_handler = channel_packet_handler; 787 chan->remote_mtu = L2CAP_MINIMAL_MTU; 788 chan->local_mtu = mtu; 789 790 // set initial state 791 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 792 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 793 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 794 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 795 chan->required_security_level = LEVEL_0; 796 797 // add to connections list 798 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 799 800 // check if hci connection is already usable 801 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 802 if (conn){ 803 log_info("l2cap_create_channel_internal, hci connection already exists"); 804 l2cap_handle_connection_complete(conn->con_handle, chan); 805 // check if remote supported fearures are already received 806 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 807 l2cap_handle_remote_supported_features_received(chan); 808 } 809 } 810 811 l2cap_run(); 812 } 813 814 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 815 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 816 // find channel for local_cid 817 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 818 if (channel) { 819 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 820 } 821 // process 822 l2cap_run(); 823 } 824 825 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 826 linked_list_iterator_t it; 827 linked_list_iterator_init(&it, &l2cap_channels); 828 while (linked_list_iterator_has_next(&it)){ 829 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 830 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 831 // channel for this address found 832 switch (channel->state){ 833 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 834 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 835 // failure, forward error code 836 l2cap_emit_channel_opened(channel, status); 837 // discard channel 838 l2cap_stop_rtx(channel); 839 linked_list_iterator_remove(&it); 840 btstack_memory_l2cap_channel_free(channel); 841 break; 842 default: 843 break; 844 } 845 } 846 } 847 848 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 849 linked_list_iterator_t it; 850 linked_list_iterator_init(&it, &l2cap_channels); 851 while (linked_list_iterator_has_next(&it)){ 852 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 853 if ( ! BD_ADDR_CMP( channel->address, address) ){ 854 l2cap_handle_connection_complete(handle, channel); 855 } 856 } 857 // process 858 l2cap_run(); 859 } 860 861 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 862 863 bd_addr_t address; 864 hci_con_handle_t handle; 865 linked_list_iterator_t it; 866 int hci_con_used; 867 868 switch(packet[0]){ 869 870 // handle connection complete events 871 case HCI_EVENT_CONNECTION_COMPLETE: 872 bt_flip_addr(address, &packet[5]); 873 if (packet[2] == 0){ 874 handle = READ_BT_16(packet, 3); 875 l2cap_handle_connection_success_for_addr(address, handle); 876 } else { 877 l2cap_handle_connection_failed_for_addr(address, packet[2]); 878 } 879 break; 880 881 // handle successful create connection cancel command 882 case HCI_EVENT_COMMAND_COMPLETE: 883 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 884 if (packet[5] == 0){ 885 bt_flip_addr(address, &packet[6]); 886 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 887 l2cap_handle_connection_failed_for_addr(address, 0x16); 888 } 889 } 890 l2cap_run(); // try sending signaling packets first 891 break; 892 893 case HCI_EVENT_COMMAND_STATUS: 894 l2cap_run(); // try sending signaling packets first 895 break; 896 897 // handle disconnection complete events 898 case HCI_EVENT_DISCONNECTION_COMPLETE: 899 // send l2cap disconnect events for all channels on this handle and free them 900 handle = READ_BT_16(packet, 3); 901 linked_list_iterator_init(&it, &l2cap_channels); 902 while (linked_list_iterator_has_next(&it)){ 903 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 904 if (channel->handle != handle) continue; 905 l2cap_emit_channel_closed(channel); 906 l2cap_stop_rtx(channel); 907 linked_list_iterator_remove(&it); 908 btstack_memory_l2cap_channel_free(channel); 909 } 910 break; 911 912 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 913 l2cap_run(); // try sending signaling packets first 914 l2cap_hand_out_credits(); 915 break; 916 917 // HCI Connection Timeouts 918 case L2CAP_EVENT_TIMEOUT_CHECK: 919 handle = READ_BT_16(packet, 2); 920 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 921 if (hci_authentication_active_for_handle(handle)) break; 922 hci_con_used = 0; 923 linked_list_iterator_init(&it, &l2cap_channels); 924 while (linked_list_iterator_has_next(&it)){ 925 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 926 if (channel->handle != handle) continue; 927 hci_con_used = 1; 928 break; 929 } 930 if (hci_con_used) break; 931 if (!hci_can_send_command_packet_now()) break; 932 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 933 break; 934 935 case DAEMON_EVENT_HCI_PACKET_SENT: 936 l2cap_run(); // try sending signaling packets first 937 l2cap_hand_out_credits(); 938 939 linked_list_iterator_init(&it, &l2cap_channels); 940 while (linked_list_iterator_has_next(&it)){ 941 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 942 if (!channel->packet_handler) continue; 943 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 944 } 945 if (attribute_protocol_packet_handler) { 946 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 947 } 948 if (security_protocol_packet_handler) { 949 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 950 } 951 if (connectionless_channel_packet_handler) { 952 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 953 } 954 break; 955 956 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 957 handle = READ_BT_16(packet, 3); 958 linked_list_iterator_init(&it, &l2cap_channels); 959 while (linked_list_iterator_has_next(&it)){ 960 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 961 if (channel->handle != handle) continue; 962 l2cap_handle_remote_supported_features_received(channel); 963 break; 964 } 965 break; 966 967 case GAP_SECURITY_LEVEL: 968 handle = READ_BT_16(packet, 2); 969 log_info("l2cap - security level update"); 970 linked_list_iterator_init(&it, &l2cap_channels); 971 while (linked_list_iterator_has_next(&it)){ 972 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 973 if (channel->handle != handle) continue; 974 975 log_info("l2cap - state %u", channel->state); 976 977 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 978 gap_security_level_t required_level = channel->required_security_level; 979 980 switch (channel->state){ 981 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 982 if (actual_level >= required_level){ 983 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 984 l2cap_emit_connection_request(channel); 985 } else { 986 channel->reason = 0x0003; // security block 987 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 988 } 989 break; 990 991 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 992 if (actual_level >= required_level){ 993 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 994 } else { 995 // disconnnect, authentication not good enough 996 hci_disconnect_security_block(handle); 997 } 998 break; 999 1000 default: 1001 break; 1002 } 1003 } 1004 break; 1005 1006 default: 1007 break; 1008 } 1009 1010 // pass on: main packet handler, att and sm packet handlers 1011 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1012 if (attribute_protocol_packet_handler){ 1013 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1014 } 1015 if (security_protocol_packet_handler) { 1016 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1017 } 1018 if (connectionless_channel_packet_handler) { 1019 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1020 } 1021 1022 l2cap_run(); 1023 } 1024 1025 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1026 channel->remote_sig_id = identifier; 1027 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1028 l2cap_run(); 1029 } 1030 1031 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1032 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1033 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1034 signaling_responses[signaling_responses_pending].handle = handle; 1035 signaling_responses[signaling_responses_pending].code = code; 1036 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1037 signaling_responses[signaling_responses_pending].data = data; 1038 signaling_responses_pending++; 1039 l2cap_run(); 1040 } 1041 } 1042 1043 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1044 1045 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1046 l2cap_service_t *service = l2cap_get_service(psm); 1047 if (!service) { 1048 // 0x0002 PSM not supported 1049 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1050 return; 1051 } 1052 1053 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1054 if (!hci_connection) { 1055 // 1056 log_error("no hci_connection for handle %u", handle); 1057 return; 1058 } 1059 1060 // alloc structure 1061 // log_info("l2cap_handle_connection_request register channel"); 1062 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1063 if (!channel){ 1064 // 0x0004 No resources available 1065 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1066 return; 1067 } 1068 // Init memory (make valgrind happy) 1069 memset(channel, 0, sizeof(l2cap_channel_t)); 1070 // fill in 1071 BD_ADDR_COPY(channel->address, hci_connection->address); 1072 channel->psm = psm; 1073 channel->handle = handle; 1074 channel->connection = service->connection; 1075 channel->packet_handler = service->packet_handler; 1076 channel->local_cid = l2cap_next_local_cid(); 1077 channel->remote_cid = source_cid; 1078 channel->local_mtu = service->mtu; 1079 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1080 channel->remote_sig_id = sig_id; 1081 channel->required_security_level = service->required_security_level; 1082 1083 // limit local mtu to max acl packet length - l2cap header 1084 if (channel->local_mtu > l2cap_max_mtu()) { 1085 channel->local_mtu = l2cap_max_mtu(); 1086 } 1087 1088 // set initial state 1089 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1090 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1091 1092 // add to connections list 1093 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1094 1095 // assert security requirements 1096 gap_request_security_level(handle, channel->required_security_level); 1097 } 1098 1099 void l2cap_accept_connection_internal(uint16_t local_cid){ 1100 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1101 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1102 if (!channel) { 1103 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1104 return; 1105 } 1106 1107 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1108 1109 // process 1110 l2cap_run(); 1111 } 1112 1113 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1114 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1115 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1116 if (!channel) { 1117 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1118 return; 1119 } 1120 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1121 channel->reason = reason; 1122 l2cap_run(); 1123 } 1124 1125 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1126 1127 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1128 1129 uint16_t flags = READ_BT_16(command, 6); 1130 if (flags & 1) { 1131 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1132 } 1133 1134 // accept the other's configuration options 1135 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1136 uint16_t pos = 8; 1137 while (pos < end_pos){ 1138 uint8_t option_hint = command[pos] >> 7; 1139 uint8_t option_type = command[pos] & 0x7f; 1140 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1141 pos++; 1142 uint8_t length = command[pos++]; 1143 // MTU { type(8): 1, len(8):2, MTU(16) } 1144 if (option_type == 1 && length == 2){ 1145 channel->remote_mtu = READ_BT_16(command, pos); 1146 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1147 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1148 } 1149 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1150 if (option_type == 2 && length == 2){ 1151 channel->flush_timeout = READ_BT_16(command, pos); 1152 } 1153 // check for unknown options 1154 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1155 log_info("l2cap cid %u, unknown options", channel->local_cid); 1156 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1157 } 1158 pos += length; 1159 } 1160 } 1161 1162 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1163 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1164 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1165 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1166 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1167 if (channel->state == L2CAP_STATE_OPEN) return 0; 1168 return 1; 1169 } 1170 1171 1172 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1173 1174 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1175 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1176 uint16_t result = 0; 1177 1178 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1179 1180 // handle DISCONNECT REQUESTS seperately 1181 if (code == DISCONNECTION_REQUEST){ 1182 switch (channel->state){ 1183 case L2CAP_STATE_CONFIG: 1184 case L2CAP_STATE_OPEN: 1185 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1186 case L2CAP_STATE_WAIT_DISCONNECT: 1187 l2cap_handle_disconnect_request(channel, identifier); 1188 break; 1189 1190 default: 1191 // ignore in other states 1192 break; 1193 } 1194 return; 1195 } 1196 1197 // @STATEMACHINE(l2cap) 1198 switch (channel->state) { 1199 1200 case L2CAP_STATE_WAIT_CONNECT_RSP: 1201 switch (code){ 1202 case CONNECTION_RESPONSE: 1203 l2cap_stop_rtx(channel); 1204 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1205 switch (result) { 1206 case 0: 1207 // successful connection 1208 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1209 channel->state = L2CAP_STATE_CONFIG; 1210 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1211 break; 1212 case 1: 1213 // connection pending. get some coffee, but start the ERTX 1214 l2cap_start_ertx(channel); 1215 break; 1216 default: 1217 // channel closed 1218 channel->state = L2CAP_STATE_CLOSED; 1219 // map l2cap connection response result to BTstack status enumeration 1220 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1221 1222 // drop link key if security block 1223 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1224 hci_drop_link_key_for_bd_addr(channel->address); 1225 } 1226 1227 // discard channel 1228 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1229 btstack_memory_l2cap_channel_free(channel); 1230 break; 1231 } 1232 break; 1233 1234 default: 1235 //@TODO: implement other signaling packets 1236 break; 1237 } 1238 break; 1239 1240 case L2CAP_STATE_CONFIG: 1241 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1242 switch (code) { 1243 case CONFIGURE_REQUEST: 1244 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1245 l2cap_signaling_handle_configure_request(channel, command); 1246 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1247 // only done if continuation not set 1248 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1249 } 1250 break; 1251 case CONFIGURE_RESPONSE: 1252 l2cap_stop_rtx(channel); 1253 switch (result){ 1254 case 0: // success 1255 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1256 break; 1257 case 4: // pending 1258 l2cap_start_ertx(channel); 1259 break; 1260 default: 1261 // retry on negative result 1262 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1263 break; 1264 } 1265 break; 1266 default: 1267 break; 1268 } 1269 if (l2cap_channel_ready_for_open(channel)){ 1270 // for open: 1271 channel->state = L2CAP_STATE_OPEN; 1272 l2cap_emit_channel_opened(channel, 0); 1273 l2cap_emit_credits(channel, 1); 1274 } 1275 break; 1276 1277 case L2CAP_STATE_WAIT_DISCONNECT: 1278 switch (code) { 1279 case DISCONNECTION_RESPONSE: 1280 l2cap_finialize_channel_close(channel); 1281 break; 1282 default: 1283 //@TODO: implement other signaling packets 1284 break; 1285 } 1286 break; 1287 1288 case L2CAP_STATE_CLOSED: 1289 // @TODO handle incoming requests 1290 break; 1291 1292 case L2CAP_STATE_OPEN: 1293 //@TODO: implement other signaling packets, e.g. re-configure 1294 break; 1295 default: 1296 break; 1297 } 1298 // log_info("new state %u", channel->state); 1299 } 1300 1301 1302 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1303 1304 // get code, signalind identifier and command len 1305 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1306 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1307 1308 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1309 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1310 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1311 return; 1312 } 1313 1314 // general commands without an assigned channel 1315 switch(code) { 1316 1317 case CONNECTION_REQUEST: { 1318 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1319 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1320 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1321 return; 1322 } 1323 1324 case ECHO_REQUEST: 1325 l2cap_register_signaling_response(handle, code, sig_id, 0); 1326 return; 1327 1328 case INFORMATION_REQUEST: { 1329 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1330 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1331 return; 1332 } 1333 1334 default: 1335 break; 1336 } 1337 1338 1339 // Get potential destination CID 1340 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1341 1342 // Find channel for this sig_id and connection handle 1343 linked_list_iterator_t it; 1344 linked_list_iterator_init(&it, &l2cap_channels); 1345 while (linked_list_iterator_has_next(&it)){ 1346 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1347 if (channel->handle != handle) continue; 1348 if (code & 1) { 1349 // match odd commands (responses) by previous signaling identifier 1350 if (channel->local_sig_id == sig_id) { 1351 l2cap_signaling_handler_channel(channel, command); 1352 break; 1353 } 1354 } else { 1355 // match even commands (requests) by local channel id 1356 if (channel->local_cid == dest_cid) { 1357 l2cap_signaling_handler_channel(channel, command); 1358 break; 1359 } 1360 } 1361 } 1362 } 1363 1364 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1365 1366 // Get Channel ID 1367 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1368 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1369 1370 switch (channel_id) { 1371 1372 case L2CAP_CID_SIGNALING: { 1373 1374 uint16_t command_offset = 8; 1375 while (command_offset < size) { 1376 1377 // handle signaling commands 1378 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1379 1380 // increment command_offset 1381 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1382 } 1383 break; 1384 } 1385 1386 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1387 if (attribute_protocol_packet_handler) { 1388 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1389 } 1390 break; 1391 1392 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1393 if (security_protocol_packet_handler) { 1394 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1395 } 1396 break; 1397 1398 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1399 if (connectionless_channel_packet_handler) { 1400 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1401 } 1402 break; 1403 1404 case L2CAP_CID_SIGNALING_LE: { 1405 switch (packet[8]){ 1406 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1407 uint16_t result = READ_BT_16(packet, 12); 1408 l2cap_emit_connection_parameter_update_response(handle, result); 1409 break; 1410 } 1411 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1412 uint8_t event[10]; 1413 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1414 event[1] = 8; 1415 memcpy(&event[2], &packet[12], 8); 1416 1417 hci_connection_t * connection = hci_connection_for_handle(handle); 1418 if (connection){ 1419 if (connection->role != HCI_ROLE_MASTER){ 1420 // reject command without notifying upper layer when not in master role 1421 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1422 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1423 break; 1424 } 1425 int update_parameter = 1; 1426 le_connection_parameter_range_t existing_range; 1427 gap_le_get_connection_parameter_range(existing_range); 1428 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1429 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1430 uint16_t le_conn_latency = READ_BT_16(packet,16); 1431 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1432 1433 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1434 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1435 1436 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1437 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1438 1439 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1440 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1441 1442 if (update_parameter){ 1443 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1444 connection->le_conn_interval_min = le_conn_interval_min; 1445 connection->le_conn_interval_max = le_conn_interval_max; 1446 connection->le_conn_latency = le_conn_latency; 1447 connection->le_supervision_timeout = le_supervision_timeout; 1448 } else { 1449 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1450 } 1451 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1452 } 1453 1454 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1455 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1456 1457 break; 1458 } 1459 default: { 1460 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1461 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1462 break; 1463 } 1464 } 1465 break; 1466 } 1467 1468 default: { 1469 // Find channel for this channel_id and connection handle 1470 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1471 if (channel) { 1472 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1473 } 1474 break; 1475 } 1476 } 1477 } 1478 1479 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1480 switch (packet_type) { 1481 case HCI_EVENT_PACKET: 1482 l2cap_event_handler(packet, size); 1483 break; 1484 case HCI_ACL_DATA_PACKET: 1485 l2cap_acl_handler(packet, size); 1486 break; 1487 default: 1488 break; 1489 } 1490 l2cap_run(); 1491 } 1492 1493 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1494 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1495 channel->state = L2CAP_STATE_CLOSED; 1496 l2cap_emit_channel_closed(channel); 1497 // discard channel 1498 l2cap_stop_rtx(channel); 1499 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1500 btstack_memory_l2cap_channel_free(channel); 1501 } 1502 1503 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1504 linked_list_iterator_t it; 1505 linked_list_iterator_init(&it, services); 1506 while (linked_list_iterator_has_next(&it)){ 1507 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1508 if ( service->psm == psm){ 1509 return service; 1510 }; 1511 } 1512 return NULL; 1513 } 1514 1515 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1516 return l2cap_get_service_internal(&l2cap_services, psm); 1517 } 1518 1519 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){ 1520 1521 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1522 1523 // check for alread registered psm 1524 // TODO: emit error event 1525 l2cap_service_t *service = l2cap_get_service(psm); 1526 if (service) { 1527 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1528 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1529 return; 1530 } 1531 1532 // alloc structure 1533 // TODO: emit error event 1534 service = btstack_memory_l2cap_service_get(); 1535 if (!service) { 1536 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1537 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1538 return; 1539 } 1540 1541 // fill in 1542 service->psm = psm; 1543 service->mtu = mtu; 1544 service->connection = connection; 1545 service->packet_handler = service_packet_handler; 1546 service->required_security_level = security_level; 1547 1548 // add to services list 1549 linked_list_add(&l2cap_services, (linked_item_t *) service); 1550 1551 // enable page scan 1552 hci_connectable_control(1); 1553 1554 // done 1555 l2cap_emit_service_registered(connection, 0, psm); 1556 } 1557 1558 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1559 1560 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1561 1562 l2cap_service_t *service = l2cap_get_service(psm); 1563 if (!service) return; 1564 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1565 btstack_memory_l2cap_service_free(service); 1566 1567 // disable page scan when no services registered 1568 if (!linked_list_empty(&l2cap_services)) return; 1569 hci_connectable_control(0); 1570 } 1571 1572 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1573 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1574 switch(channel_id){ 1575 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1576 attribute_protocol_packet_handler = the_packet_handler; 1577 break; 1578 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1579 security_protocol_packet_handler = the_packet_handler; 1580 break; 1581 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1582 connectionless_channel_packet_handler = the_packet_handler; 1583 break; 1584 } 1585 } 1586 1587 #ifdef HAVE_BLE 1588 1589 1590 #if 0 1591 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1592 return l2cap_get_service_internal(&l2cap_le_services, psm); 1593 } 1594 /** 1595 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1596 * @param 1597 */ 1598 void l2cap_le_register_service_internal(void * connection, btstack_packet_handler_t packet_handler, uint16_t psm, 1599 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1600 1601 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1602 1603 // check for alread registered psm 1604 // TODO: emit error event 1605 l2cap_service_t *service = l2cap_le_get_service(psm); 1606 if (service) { 1607 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1608 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1609 return; 1610 } 1611 1612 // alloc structure 1613 // TODO: emit error event 1614 service = btstack_memory_l2cap_service_get(); 1615 if (!service) { 1616 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1617 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1618 return; 1619 } 1620 1621 // fill in 1622 service->psm = psm; 1623 service->mtu = mtu; 1624 service->mps = mps; 1625 service->connection = connection; 1626 service->packet_handler = packet_handler; 1627 service->required_security_level = security_level; 1628 1629 // add to services list 1630 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1631 1632 // done 1633 l2cap_emit_service_registered(connection, 0, psm); 1634 } 1635 1636 void l2cap_le_unregister_service_internal(void * connection, uint16_t psm) { 1637 1638 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1639 1640 l2cap_service_t *service = l2cap_le_get_service(psm); 1641 if (!service) return; 1642 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1643 btstack_memory_l2cap_service_free(service); 1644 } 1645 #endif 1646 #endif 1647