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 return hci_can_send_acl_packet_now(channel->handle); 243 } 244 245 // @deprecated 246 int l2cap_can_send_connectionless_packet_now(void){ 247 // TODO provide real handle 248 return l2cap_can_send_fixed_channel_packet_now(0x1234); 249 } 250 251 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 252 return hci_can_send_acl_packet_now(handle); 253 } 254 255 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 256 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 257 if (channel) { 258 return channel->remote_mtu; 259 } 260 return 0; 261 } 262 263 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 264 linked_list_iterator_t it; 265 linked_list_iterator_init(&it, &l2cap_channels); 266 while (linked_list_iterator_has_next(&it)){ 267 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 268 if ( &channel->rtx == ts) { 269 return channel; 270 } 271 } 272 return NULL; 273 } 274 275 static void l2cap_rtx_timeout(timer_source_t * ts){ 276 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 277 if (!ts) return; 278 279 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 280 281 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 282 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 283 // notify client 284 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 285 286 // discard channel 287 // no need to stop timer here, it is removed from list during timer callback 288 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 289 btstack_memory_l2cap_channel_free(channel); 290 } 291 292 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 293 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 294 run_loop_remove_timer(&channel->rtx); 295 } 296 297 static void l2cap_start_rtx(l2cap_channel_t * channel){ 298 l2cap_stop_rtx(channel); 299 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 300 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 301 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 302 run_loop_add_timer(&channel->rtx); 303 } 304 305 static void l2cap_start_ertx(l2cap_channel_t * channel){ 306 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 307 l2cap_stop_rtx(channel); 308 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 309 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 310 run_loop_add_timer(&channel->rtx); 311 } 312 313 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 314 require_security_level2_for_outgoing_sdp = 1; 315 } 316 317 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 318 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 319 } 320 321 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 322 323 if (!hci_can_send_acl_packet_now(handle)){ 324 log_info("l2cap_send_signaling_packet, cannot send"); 325 return BTSTACK_ACL_BUFFERS_FULL; 326 } 327 328 // log_info("l2cap_send_signaling_packet type %u", cmd); 329 hci_reserve_packet_buffer(); 330 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 331 va_list argptr; 332 va_start(argptr, identifier); 333 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 334 va_end(argptr); 335 // log_info("l2cap_send_signaling_packet con %u!", handle); 336 return hci_send_acl_packet_buffer(len); 337 } 338 339 #ifdef HAVE_BLE 340 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 341 342 if (!hci_can_send_acl_packet_now(handle)){ 343 log_info("l2cap_send_signaling_packet, cannot send"); 344 return BTSTACK_ACL_BUFFERS_FULL; 345 } 346 347 // log_info("l2cap_send_signaling_packet type %u", cmd); 348 hci_reserve_packet_buffer(); 349 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 350 va_list argptr; 351 va_start(argptr, identifier); 352 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 353 va_end(argptr); 354 // log_info("l2cap_send_signaling_packet con %u!", handle); 355 return hci_send_acl_packet_buffer(len); 356 } 357 #endif 358 359 uint8_t *l2cap_get_outgoing_buffer(void){ 360 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 361 } 362 363 int l2cap_reserve_packet_buffer(void){ 364 return hci_reserve_packet_buffer(); 365 } 366 367 void l2cap_release_packet_buffer(void){ 368 hci_release_packet_buffer(); 369 } 370 371 372 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 373 374 if (!hci_is_packet_buffer_reserved()){ 375 log_error("l2cap_send_prepared called without reserving packet first"); 376 return BTSTACK_ACL_BUFFERS_FULL; 377 } 378 379 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 380 if (!channel) { 381 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 382 return -1; // TODO: define error 383 } 384 385 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 386 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 387 return BTSTACK_ACL_BUFFERS_FULL; 388 } 389 390 if (channel->packets_granted){ 391 --channel->packets_granted; 392 } 393 394 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used, credits left %u;", 395 local_cid, channel->handle, channel->packets_granted); 396 397 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 398 399 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 400 401 // 0 - Connection handle : PB=pb : BC=00 402 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 403 // 2 - ACL length 404 bt_store_16(acl_buffer, 2, len + 4); 405 // 4 - L2CAP packet length 406 bt_store_16(acl_buffer, 4, len + 0); 407 // 6 - L2CAP channel DEST 408 bt_store_16(acl_buffer, 6, channel->remote_cid); 409 // send 410 int err = hci_send_acl_packet_buffer(len+8); 411 412 l2cap_hand_out_credits(); 413 414 return err; 415 } 416 417 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 418 419 if (!hci_is_packet_buffer_reserved()){ 420 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 421 return BTSTACK_ACL_BUFFERS_FULL; 422 } 423 424 if (!hci_can_send_prepared_acl_packet_now(handle)){ 425 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 426 return BTSTACK_ACL_BUFFERS_FULL; 427 } 428 429 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 430 431 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 432 433 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 434 435 // 0 - Connection handle : PB=pb : BC=00 436 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 437 // 2 - ACL length 438 bt_store_16(acl_buffer, 2, len + 4); 439 // 4 - L2CAP packet length 440 bt_store_16(acl_buffer, 4, len + 0); 441 // 6 - L2CAP channel DEST 442 bt_store_16(acl_buffer, 6, cid); 443 // send 444 int err = hci_send_acl_packet_buffer(len+8); 445 446 l2cap_hand_out_credits(); 447 448 return err; 449 } 450 451 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 452 453 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 454 if (!channel) { 455 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 456 return -1; // TODO: define error 457 } 458 459 if (len > channel->remote_mtu){ 460 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 461 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 462 } 463 464 if (!hci_can_send_acl_packet_now(channel->handle)){ 465 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 466 return BTSTACK_ACL_BUFFERS_FULL; 467 } 468 469 hci_reserve_packet_buffer(); 470 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 471 472 memcpy(&acl_buffer[8], data, len); 473 474 return l2cap_send_prepared(local_cid, len); 475 } 476 477 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 478 479 if (!hci_can_send_acl_packet_now(handle)){ 480 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 481 return BTSTACK_ACL_BUFFERS_FULL; 482 } 483 484 hci_reserve_packet_buffer(); 485 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 486 487 memcpy(&acl_buffer[8], data, len); 488 489 return l2cap_send_prepared_connectionless(handle, cid, len); 490 } 491 492 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 493 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 494 } 495 496 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 497 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 498 } 499 500 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 501 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 502 } 503 504 505 506 // MARK: L2CAP_RUN 507 // process outstanding signaling tasks 508 static void l2cap_run(void){ 509 510 // log_info("l2cap_run: entered"); 511 512 // check pending signaling responses 513 while (signaling_responses_pending){ 514 515 hci_con_handle_t handle = signaling_responses[0].handle; 516 517 if (!hci_can_send_acl_packet_now(handle)) break; 518 519 uint8_t sig_id = signaling_responses[0].sig_id; 520 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 521 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 522 uint8_t response_code = signaling_responses[0].code; 523 524 // remove first item before sending (to avoid sending response mutliple times) 525 signaling_responses_pending--; 526 int i; 527 for (i=0; i < signaling_responses_pending; i++){ 528 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 529 } 530 531 switch (response_code){ 532 case CONNECTION_REQUEST: 533 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 534 // also disconnect if result is 0x0003 - security blocked 535 if (result == 0x0003){ 536 hci_disconnect_security_block(handle); 537 } 538 break; 539 case ECHO_REQUEST: 540 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 541 break; 542 case INFORMATION_REQUEST: 543 switch (infoType){ 544 case 1: { // Connectionless MTU 545 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 546 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 547 break; 548 } 549 case 2: { // Extended Features Supported 550 // extended features request supported, features: fixed channels, unicast connectionless data reception 551 uint32_t features = 0x280; 552 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 553 break; 554 } 555 case 3: { // Fixed Channels Supported 556 uint8_t map[8]; 557 memset(map, 0, 8); 558 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 559 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 560 break; 561 } 562 default: 563 // all other types are not supported 564 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 565 break; 566 } 567 break; 568 case COMMAND_REJECT: 569 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 570 #ifdef HAVE_BLE 571 case COMMAND_REJECT_LE: 572 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 573 break; 574 #endif 575 default: 576 // should not happen 577 break; 578 } 579 } 580 581 uint8_t config_options[4]; 582 linked_list_iterator_t it; 583 linked_list_iterator_init(&it, &l2cap_channels); 584 while (linked_list_iterator_has_next(&it)){ 585 586 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 587 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 588 switch (channel->state){ 589 590 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 591 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 592 if (!hci_can_send_acl_packet_now(channel->handle)) break; 593 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 594 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 595 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 596 } 597 break; 598 599 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 600 if (!hci_can_send_command_packet_now()) break; 601 // send connection request - set state first 602 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 603 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 604 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 605 break; 606 607 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 608 if (!hci_can_send_acl_packet_now(channel->handle)) break; 609 channel->state = L2CAP_STATE_INVALID; 610 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 611 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 612 l2cap_stop_rtx(channel); 613 linked_list_iterator_remove(&it); 614 btstack_memory_l2cap_channel_free(channel); 615 break; 616 617 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 618 if (!hci_can_send_acl_packet_now(channel->handle)) break; 619 channel->state = L2CAP_STATE_CONFIG; 620 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 621 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 622 break; 623 624 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 625 if (!hci_can_send_acl_packet_now(channel->handle)) break; 626 // success, start l2cap handshake 627 channel->local_sig_id = l2cap_next_sig_id(); 628 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 629 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 630 l2cap_start_rtx(channel); 631 break; 632 633 case L2CAP_STATE_CONFIG: 634 if (!hci_can_send_acl_packet_now(channel->handle)) break; 635 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 636 uint16_t flags = 0; 637 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 638 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 639 flags = 1; 640 } else { 641 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 642 } 643 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 644 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 645 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 646 config_options[0] = 1; // MTU 647 config_options[1] = 2; // len param 648 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 649 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 650 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 651 } else { 652 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 653 } 654 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 655 } 656 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 657 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 658 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 659 channel->local_sig_id = l2cap_next_sig_id(); 660 config_options[0] = 1; // MTU 661 config_options[1] = 2; // len param 662 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 663 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 664 l2cap_start_rtx(channel); 665 } 666 if (l2cap_channel_ready_for_open(channel)){ 667 channel->state = L2CAP_STATE_OPEN; 668 l2cap_emit_channel_opened(channel, 0); // success 669 l2cap_emit_credits(channel, 1); 670 } 671 break; 672 673 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 674 if (!hci_can_send_acl_packet_now(channel->handle)) break; 675 channel->state = L2CAP_STATE_INVALID; 676 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 677 // 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 :) 678 l2cap_finialize_channel_close(channel); // -- remove from list 679 break; 680 681 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 682 if (!hci_can_send_acl_packet_now(channel->handle)) break; 683 channel->local_sig_id = l2cap_next_sig_id(); 684 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 685 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 686 break; 687 default: 688 break; 689 } 690 } 691 692 #ifdef HAVE_BLE 693 // send l2cap con paramter update if necessary 694 hci_connections_get_iterator(&it); 695 while(linked_list_iterator_has_next(&it)){ 696 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 697 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 698 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 699 switch (connection->le_con_parameter_update_state){ 700 case CON_PARAMETER_UPDATE_SEND_REQUEST: 701 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 702 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 703 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 704 break; 705 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 706 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 707 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 708 break; 709 case CON_PARAMETER_UPDATE_DENY: 710 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 711 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 712 break; 713 default: 714 break; 715 } 716 } 717 #endif 718 719 // log_info("l2cap_run: exit"); 720 } 721 722 uint16_t l2cap_max_mtu(void){ 723 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 724 } 725 726 uint16_t l2cap_max_le_mtu(void){ 727 return l2cap_max_mtu(); 728 } 729 730 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 731 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 732 log_info("l2cap_handle_connection_complete expected state"); 733 // success, start l2cap handshake 734 channel->handle = handle; 735 // check remote SSP feature first 736 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 737 } 738 } 739 740 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 741 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 742 743 // we have been waiting for remote supported features, if both support SSP, 744 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)); 745 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 746 // request security level 2 747 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 748 gap_request_security_level(channel->handle, LEVEL_2); 749 return; 750 } 751 // fine, go ahead 752 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 753 } 754 755 /** 756 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 757 * @param packet_handler 758 * @param address 759 * @param psm 760 * @param mtu 761 * @param local_cid 762 */ 763 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){ 764 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 765 766 // alloc structure 767 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 768 if (!chan) { 769 return BTSTACK_MEMORY_ALLOC_FAILED; 770 } 771 772 // Init memory (make valgrind happy) 773 memset(chan, 0, sizeof(l2cap_channel_t)); 774 // limit local mtu to max acl packet length - l2cap header 775 if (mtu > l2cap_max_mtu()) { 776 mtu = l2cap_max_mtu(); 777 } 778 779 // fill in 780 BD_ADDR_COPY(chan->address, address); 781 chan->psm = psm; 782 chan->handle = 0; 783 chan->packet_handler = channel_packet_handler; 784 chan->remote_mtu = L2CAP_MINIMAL_MTU; 785 chan->local_mtu = mtu; 786 chan->packets_granted = 0; 787 chan->local_cid = l2cap_next_local_cid(); 788 789 // set initial state 790 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 791 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 792 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 793 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 794 chan->required_security_level = LEVEL_0; 795 796 // add to connections list 797 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 798 799 // store local_cid 800 if (out_local_cid){ 801 *out_local_cid = chan->local_cid; 802 } 803 804 // check if hci connection is already usable 805 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 806 if (conn){ 807 log_info("l2cap_create_channel_internal, hci connection already exists"); 808 l2cap_handle_connection_complete(conn->con_handle, chan); 809 // check if remote supported fearures are already received 810 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 811 l2cap_handle_remote_supported_features_received(chan); 812 } 813 } 814 815 l2cap_run(); 816 817 return 0; 818 } 819 820 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 821 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 822 // find channel for local_cid 823 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 824 if (channel) { 825 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 826 } 827 // process 828 l2cap_run(); 829 } 830 831 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 832 linked_list_iterator_t it; 833 linked_list_iterator_init(&it, &l2cap_channels); 834 while (linked_list_iterator_has_next(&it)){ 835 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 836 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 837 // channel for this address found 838 switch (channel->state){ 839 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 840 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 841 // failure, forward error code 842 l2cap_emit_channel_opened(channel, status); 843 // discard channel 844 l2cap_stop_rtx(channel); 845 linked_list_iterator_remove(&it); 846 btstack_memory_l2cap_channel_free(channel); 847 break; 848 default: 849 break; 850 } 851 } 852 } 853 854 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 855 linked_list_iterator_t it; 856 linked_list_iterator_init(&it, &l2cap_channels); 857 while (linked_list_iterator_has_next(&it)){ 858 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 859 if ( ! BD_ADDR_CMP( channel->address, address) ){ 860 l2cap_handle_connection_complete(handle, channel); 861 } 862 } 863 // process 864 l2cap_run(); 865 } 866 867 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 868 869 bd_addr_t address; 870 hci_con_handle_t handle; 871 linked_list_iterator_t it; 872 int hci_con_used; 873 874 switch(packet[0]){ 875 876 // handle connection complete events 877 case HCI_EVENT_CONNECTION_COMPLETE: 878 bt_flip_addr(address, &packet[5]); 879 if (packet[2] == 0){ 880 handle = READ_BT_16(packet, 3); 881 l2cap_handle_connection_success_for_addr(address, handle); 882 } else { 883 l2cap_handle_connection_failed_for_addr(address, packet[2]); 884 } 885 break; 886 887 // handle successful create connection cancel command 888 case HCI_EVENT_COMMAND_COMPLETE: 889 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 890 if (packet[5] == 0){ 891 bt_flip_addr(address, &packet[6]); 892 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 893 l2cap_handle_connection_failed_for_addr(address, 0x16); 894 } 895 } 896 l2cap_run(); // try sending signaling packets first 897 break; 898 899 case HCI_EVENT_COMMAND_STATUS: 900 l2cap_run(); // try sending signaling packets first 901 break; 902 903 // handle disconnection complete events 904 case HCI_EVENT_DISCONNECTION_COMPLETE: 905 // send l2cap disconnect events for all channels on this handle and free them 906 handle = READ_BT_16(packet, 3); 907 linked_list_iterator_init(&it, &l2cap_channels); 908 while (linked_list_iterator_has_next(&it)){ 909 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 910 if (channel->handle != handle) continue; 911 l2cap_emit_channel_closed(channel); 912 l2cap_stop_rtx(channel); 913 linked_list_iterator_remove(&it); 914 btstack_memory_l2cap_channel_free(channel); 915 } 916 break; 917 918 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 919 l2cap_run(); // try sending signaling packets first 920 l2cap_hand_out_credits(); 921 break; 922 923 // HCI Connection Timeouts 924 case L2CAP_EVENT_TIMEOUT_CHECK: 925 handle = READ_BT_16(packet, 2); 926 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 927 if (hci_authentication_active_for_handle(handle)) break; 928 hci_con_used = 0; 929 linked_list_iterator_init(&it, &l2cap_channels); 930 while (linked_list_iterator_has_next(&it)){ 931 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 932 if (channel->handle != handle) continue; 933 hci_con_used = 1; 934 break; 935 } 936 if (hci_con_used) break; 937 if (!hci_can_send_command_packet_now()) break; 938 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 939 break; 940 941 case DAEMON_EVENT_HCI_PACKET_SENT: 942 l2cap_run(); // try sending signaling packets first 943 l2cap_hand_out_credits(); 944 945 linked_list_iterator_init(&it, &l2cap_channels); 946 while (linked_list_iterator_has_next(&it)){ 947 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 948 if (!channel->packet_handler) continue; 949 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 950 } 951 if (attribute_protocol_packet_handler) { 952 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 953 } 954 if (security_protocol_packet_handler) { 955 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 956 } 957 if (connectionless_channel_packet_handler) { 958 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 959 } 960 break; 961 962 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 963 handle = READ_BT_16(packet, 3); 964 linked_list_iterator_init(&it, &l2cap_channels); 965 while (linked_list_iterator_has_next(&it)){ 966 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 967 if (channel->handle != handle) continue; 968 l2cap_handle_remote_supported_features_received(channel); 969 break; 970 } 971 break; 972 973 case GAP_SECURITY_LEVEL: 974 handle = READ_BT_16(packet, 2); 975 log_info("l2cap - security level update"); 976 linked_list_iterator_init(&it, &l2cap_channels); 977 while (linked_list_iterator_has_next(&it)){ 978 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 979 if (channel->handle != handle) continue; 980 981 log_info("l2cap - state %u", channel->state); 982 983 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 984 gap_security_level_t required_level = channel->required_security_level; 985 986 switch (channel->state){ 987 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 988 if (actual_level >= required_level){ 989 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 990 l2cap_emit_connection_request(channel); 991 } else { 992 channel->reason = 0x0003; // security block 993 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 994 } 995 break; 996 997 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 998 if (actual_level >= required_level){ 999 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1000 } else { 1001 // disconnnect, authentication not good enough 1002 hci_disconnect_security_block(handle); 1003 } 1004 break; 1005 1006 default: 1007 break; 1008 } 1009 } 1010 break; 1011 1012 default: 1013 break; 1014 } 1015 1016 // pass on: main packet handler, att and sm packet handlers 1017 (*packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1018 if (attribute_protocol_packet_handler){ 1019 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1020 } 1021 if (security_protocol_packet_handler) { 1022 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1023 } 1024 if (connectionless_channel_packet_handler) { 1025 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1026 } 1027 1028 l2cap_run(); 1029 } 1030 1031 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1032 channel->remote_sig_id = identifier; 1033 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1034 l2cap_run(); 1035 } 1036 1037 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1038 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1039 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1040 signaling_responses[signaling_responses_pending].handle = handle; 1041 signaling_responses[signaling_responses_pending].code = code; 1042 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1043 signaling_responses[signaling_responses_pending].data = data; 1044 signaling_responses_pending++; 1045 l2cap_run(); 1046 } 1047 } 1048 1049 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1050 1051 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1052 l2cap_service_t *service = l2cap_get_service(psm); 1053 if (!service) { 1054 // 0x0002 PSM not supported 1055 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1056 return; 1057 } 1058 1059 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1060 if (!hci_connection) { 1061 // 1062 log_error("no hci_connection for handle %u", handle); 1063 return; 1064 } 1065 1066 // alloc structure 1067 // log_info("l2cap_handle_connection_request register channel"); 1068 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1069 if (!channel){ 1070 // 0x0004 No resources available 1071 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1072 return; 1073 } 1074 // Init memory (make valgrind happy) 1075 memset(channel, 0, sizeof(l2cap_channel_t)); 1076 // fill in 1077 BD_ADDR_COPY(channel->address, hci_connection->address); 1078 channel->psm = psm; 1079 channel->handle = handle; 1080 channel->packet_handler = service->packet_handler; 1081 channel->local_cid = l2cap_next_local_cid(); 1082 channel->remote_cid = source_cid; 1083 channel->local_mtu = service->mtu; 1084 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1085 channel->packets_granted = 0; 1086 channel->remote_sig_id = sig_id; 1087 channel->required_security_level = service->required_security_level; 1088 1089 // limit local mtu to max acl packet length - l2cap header 1090 if (channel->local_mtu > l2cap_max_mtu()) { 1091 channel->local_mtu = l2cap_max_mtu(); 1092 } 1093 1094 // set initial state 1095 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1096 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1097 1098 // add to connections list 1099 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1100 1101 // assert security requirements 1102 gap_request_security_level(handle, channel->required_security_level); 1103 } 1104 1105 void l2cap_accept_connection_internal(uint16_t local_cid){ 1106 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1107 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1108 if (!channel) { 1109 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1110 return; 1111 } 1112 1113 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1114 1115 // process 1116 l2cap_run(); 1117 } 1118 1119 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1120 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1121 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1122 if (!channel) { 1123 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1124 return; 1125 } 1126 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1127 channel->reason = reason; 1128 l2cap_run(); 1129 } 1130 1131 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1132 1133 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1134 1135 uint16_t flags = READ_BT_16(command, 6); 1136 if (flags & 1) { 1137 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1138 } 1139 1140 // accept the other's configuration options 1141 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1142 uint16_t pos = 8; 1143 while (pos < end_pos){ 1144 uint8_t option_hint = command[pos] >> 7; 1145 uint8_t option_type = command[pos] & 0x7f; 1146 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1147 pos++; 1148 uint8_t length = command[pos++]; 1149 // MTU { type(8): 1, len(8):2, MTU(16) } 1150 if (option_type == 1 && length == 2){ 1151 channel->remote_mtu = READ_BT_16(command, pos); 1152 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1153 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1154 } 1155 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1156 if (option_type == 2 && length == 2){ 1157 channel->flush_timeout = READ_BT_16(command, pos); 1158 } 1159 // check for unknown options 1160 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1161 log_info("l2cap cid %u, unknown options", channel->local_cid); 1162 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1163 } 1164 pos += length; 1165 } 1166 } 1167 1168 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1169 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1170 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1171 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1172 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1173 if (channel->state == L2CAP_STATE_OPEN) return 0; 1174 return 1; 1175 } 1176 1177 1178 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1179 1180 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1181 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1182 uint16_t result = 0; 1183 1184 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1185 1186 // handle DISCONNECT REQUESTS seperately 1187 if (code == DISCONNECTION_REQUEST){ 1188 switch (channel->state){ 1189 case L2CAP_STATE_CONFIG: 1190 case L2CAP_STATE_OPEN: 1191 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1192 case L2CAP_STATE_WAIT_DISCONNECT: 1193 l2cap_handle_disconnect_request(channel, identifier); 1194 break; 1195 1196 default: 1197 // ignore in other states 1198 break; 1199 } 1200 return; 1201 } 1202 1203 // @STATEMACHINE(l2cap) 1204 switch (channel->state) { 1205 1206 case L2CAP_STATE_WAIT_CONNECT_RSP: 1207 switch (code){ 1208 case CONNECTION_RESPONSE: 1209 l2cap_stop_rtx(channel); 1210 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1211 switch (result) { 1212 case 0: 1213 // successful connection 1214 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1215 channel->state = L2CAP_STATE_CONFIG; 1216 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1217 break; 1218 case 1: 1219 // connection pending. get some coffee, but start the ERTX 1220 l2cap_start_ertx(channel); 1221 break; 1222 default: 1223 // channel closed 1224 channel->state = L2CAP_STATE_CLOSED; 1225 // map l2cap connection response result to BTstack status enumeration 1226 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1227 1228 // drop link key if security block 1229 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1230 hci_drop_link_key_for_bd_addr(channel->address); 1231 } 1232 1233 // discard channel 1234 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1235 btstack_memory_l2cap_channel_free(channel); 1236 break; 1237 } 1238 break; 1239 1240 default: 1241 //@TODO: implement other signaling packets 1242 break; 1243 } 1244 break; 1245 1246 case L2CAP_STATE_CONFIG: 1247 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1248 switch (code) { 1249 case CONFIGURE_REQUEST: 1250 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1251 l2cap_signaling_handle_configure_request(channel, command); 1252 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1253 // only done if continuation not set 1254 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1255 } 1256 break; 1257 case CONFIGURE_RESPONSE: 1258 l2cap_stop_rtx(channel); 1259 switch (result){ 1260 case 0: // success 1261 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1262 break; 1263 case 4: // pending 1264 l2cap_start_ertx(channel); 1265 break; 1266 default: 1267 // retry on negative result 1268 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1269 break; 1270 } 1271 break; 1272 default: 1273 break; 1274 } 1275 if (l2cap_channel_ready_for_open(channel)){ 1276 // for open: 1277 channel->state = L2CAP_STATE_OPEN; 1278 l2cap_emit_channel_opened(channel, 0); 1279 l2cap_emit_credits(channel, 1); 1280 } 1281 break; 1282 1283 case L2CAP_STATE_WAIT_DISCONNECT: 1284 switch (code) { 1285 case DISCONNECTION_RESPONSE: 1286 l2cap_finialize_channel_close(channel); 1287 break; 1288 default: 1289 //@TODO: implement other signaling packets 1290 break; 1291 } 1292 break; 1293 1294 case L2CAP_STATE_CLOSED: 1295 // @TODO handle incoming requests 1296 break; 1297 1298 case L2CAP_STATE_OPEN: 1299 //@TODO: implement other signaling packets, e.g. re-configure 1300 break; 1301 default: 1302 break; 1303 } 1304 // log_info("new state %u", channel->state); 1305 } 1306 1307 1308 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1309 1310 // get code, signalind identifier and command len 1311 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1312 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1313 1314 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1315 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1316 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1317 return; 1318 } 1319 1320 // general commands without an assigned channel 1321 switch(code) { 1322 1323 case CONNECTION_REQUEST: { 1324 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1325 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1326 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1327 return; 1328 } 1329 1330 case ECHO_REQUEST: 1331 l2cap_register_signaling_response(handle, code, sig_id, 0); 1332 return; 1333 1334 case INFORMATION_REQUEST: { 1335 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1336 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1337 return; 1338 } 1339 1340 default: 1341 break; 1342 } 1343 1344 1345 // Get potential destination CID 1346 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1347 1348 // Find channel for this sig_id and connection handle 1349 linked_list_iterator_t it; 1350 linked_list_iterator_init(&it, &l2cap_channels); 1351 while (linked_list_iterator_has_next(&it)){ 1352 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1353 if (channel->handle != handle) continue; 1354 if (code & 1) { 1355 // match odd commands (responses) by previous signaling identifier 1356 if (channel->local_sig_id == sig_id) { 1357 l2cap_signaling_handler_channel(channel, command); 1358 break; 1359 } 1360 } else { 1361 // match even commands (requests) by local channel id 1362 if (channel->local_cid == dest_cid) { 1363 l2cap_signaling_handler_channel(channel, command); 1364 break; 1365 } 1366 } 1367 } 1368 } 1369 1370 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1371 1372 // Get Channel ID 1373 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1374 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1375 1376 switch (channel_id) { 1377 1378 case L2CAP_CID_SIGNALING: { 1379 1380 uint16_t command_offset = 8; 1381 while (command_offset < size) { 1382 1383 // handle signaling commands 1384 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1385 1386 // increment command_offset 1387 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1388 } 1389 break; 1390 } 1391 1392 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1393 if (attribute_protocol_packet_handler) { 1394 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1395 } 1396 break; 1397 1398 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1399 if (security_protocol_packet_handler) { 1400 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1401 } 1402 break; 1403 1404 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1405 if (connectionless_channel_packet_handler) { 1406 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1407 } 1408 break; 1409 1410 case L2CAP_CID_SIGNALING_LE: { 1411 switch (packet[8]){ 1412 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1413 uint16_t result = READ_BT_16(packet, 12); 1414 l2cap_emit_connection_parameter_update_response(handle, result); 1415 break; 1416 } 1417 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1418 uint8_t event[10]; 1419 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1420 event[1] = 8; 1421 memcpy(&event[2], &packet[12], 8); 1422 1423 hci_connection_t * connection = hci_connection_for_handle(handle); 1424 if (connection){ 1425 if (connection->role != HCI_ROLE_MASTER){ 1426 // reject command without notifying upper layer when not in master role 1427 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1428 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1429 break; 1430 } 1431 int update_parameter = 1; 1432 le_connection_parameter_range_t existing_range; 1433 gap_le_get_connection_parameter_range(existing_range); 1434 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1435 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1436 uint16_t le_conn_latency = READ_BT_16(packet,16); 1437 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1438 1439 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1440 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1441 1442 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1443 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1444 1445 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1446 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1447 1448 if (update_parameter){ 1449 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1450 connection->le_conn_interval_min = le_conn_interval_min; 1451 connection->le_conn_interval_max = le_conn_interval_max; 1452 connection->le_conn_latency = le_conn_latency; 1453 connection->le_supervision_timeout = le_supervision_timeout; 1454 } else { 1455 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1456 } 1457 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1458 } 1459 1460 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1461 (*packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1462 1463 break; 1464 } 1465 default: { 1466 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1467 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1468 break; 1469 } 1470 } 1471 break; 1472 } 1473 1474 default: { 1475 // Find channel for this channel_id and connection handle 1476 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1477 if (channel) { 1478 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1479 } 1480 break; 1481 } 1482 } 1483 } 1484 1485 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1486 switch (packet_type) { 1487 case HCI_EVENT_PACKET: 1488 l2cap_event_handler(packet, size); 1489 break; 1490 case HCI_ACL_DATA_PACKET: 1491 l2cap_acl_handler(packet, size); 1492 break; 1493 default: 1494 break; 1495 } 1496 l2cap_run(); 1497 } 1498 1499 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1500 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1501 channel->state = L2CAP_STATE_CLOSED; 1502 l2cap_emit_channel_closed(channel); 1503 // discard channel 1504 l2cap_stop_rtx(channel); 1505 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1506 btstack_memory_l2cap_channel_free(channel); 1507 } 1508 1509 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1510 linked_list_iterator_t it; 1511 linked_list_iterator_init(&it, services); 1512 while (linked_list_iterator_has_next(&it)){ 1513 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1514 if ( service->psm == psm){ 1515 return service; 1516 }; 1517 } 1518 return NULL; 1519 } 1520 1521 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1522 return l2cap_get_service_internal(&l2cap_services, psm); 1523 } 1524 1525 1526 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1527 1528 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1529 1530 // check for alread registered psm 1531 // TODO: emit error event 1532 l2cap_service_t *service = l2cap_get_service(psm); 1533 if (service) { 1534 log_error("l2cap_register_service: PSM %u already registered", psm); 1535 return L2CAP_SERVICE_ALREADY_REGISTERED; 1536 } 1537 1538 // alloc structure 1539 // TODO: emit error event 1540 service = btstack_memory_l2cap_service_get(); 1541 if (!service) { 1542 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1543 return BTSTACK_MEMORY_ALLOC_FAILED; 1544 } 1545 1546 // fill in 1547 service->psm = psm; 1548 service->mtu = mtu; 1549 service->packet_handler = service_packet_handler; 1550 service->required_security_level = security_level; 1551 1552 // add to services list 1553 linked_list_add(&l2cap_services, (linked_item_t *) service); 1554 1555 // enable page scan 1556 hci_connectable_control(1); 1557 1558 return 0; 1559 } 1560 1561 void l2cap_unregister_service(uint16_t psm){ 1562 1563 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1564 1565 l2cap_service_t *service = l2cap_get_service(psm); 1566 if (!service) return; 1567 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1568 btstack_memory_l2cap_service_free(service); 1569 1570 // disable page scan when no services registered 1571 if (!linked_list_empty(&l2cap_services)) return; 1572 hci_connectable_control(0); 1573 } 1574 1575 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1576 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1577 switch(channel_id){ 1578 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1579 attribute_protocol_packet_handler = the_packet_handler; 1580 break; 1581 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1582 security_protocol_packet_handler = the_packet_handler; 1583 break; 1584 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1585 connectionless_channel_packet_handler = the_packet_handler; 1586 break; 1587 } 1588 } 1589 1590 #ifdef HAVE_BLE 1591 1592 1593 #if 0 1594 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1595 return l2cap_get_service_internal(&l2cap_le_services, psm); 1596 } 1597 /** 1598 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1599 * @param 1600 */ 1601 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1602 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1603 1604 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1605 1606 // check for alread registered psm 1607 // TODO: emit error event 1608 l2cap_service_t *service = l2cap_le_get_service(psm); 1609 if (service) { 1610 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1611 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1612 return; 1613 } 1614 1615 // alloc structure 1616 // TODO: emit error event 1617 service = btstack_memory_l2cap_service_get(); 1618 if (!service) { 1619 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1620 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1621 return; 1622 } 1623 1624 // fill in 1625 service->psm = psm; 1626 service->mtu = mtu; 1627 service->mps = mps; 1628 service->packet_handler = packet_handler; 1629 service->required_security_level = security_level; 1630 1631 // add to services list 1632 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1633 1634 // done 1635 l2cap_emit_service_registered(connection, 0, psm); 1636 } 1637 1638 void l2cap_le_unregister_service(uint16_t psm) { 1639 1640 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1641 1642 l2cap_service_t *service = l2cap_le_get_service(psm); 1643 if (!service) return; 1644 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1645 btstack_memory_l2cap_service_free(service); 1646 } 1647 #endif 1648 #endif 1649