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 "btstack_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 // internal table 70 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL 0 71 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL 1 72 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL 2 73 #define L2CAP_FIXED_CHANNEL_TABLE_SIZE (L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL+1) 74 75 // prototypes 76 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 77 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 78 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 79 static void l2cap_emit_can_send_now(l2cap_channel_t *channel); 80 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 81 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 82 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 83 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 84 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ); 85 86 typedef struct l2cap_fixed_channel { 87 btstack_packet_handler_t callback; 88 uint8_t waiting_for_can_send_now; 89 } l2cap_fixed_channel_t; 90 91 static btstack_linked_list_t l2cap_channels; 92 static btstack_linked_list_t l2cap_services; 93 static btstack_linked_list_t l2cap_le_channels; 94 static btstack_linked_list_t l2cap_le_services; 95 96 // used to cache l2cap rejects, echo, and informational requests 97 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 98 static int signaling_responses_pending; 99 100 static uint8_t require_security_level2_for_outgoing_sdp; 101 102 static btstack_packet_callback_registration_t hci_event_callback_registration; 103 104 static btstack_packet_handler_t l2cap_event_packet_handler; 105 static l2cap_fixed_channel_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_SIZE]; 106 107 // static btstack_packet_handler_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL]; 108 // static btstack_packet_handler_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL]; 109 // static btstack_packet_handler_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL]; 110 111 static int l2cap_fixed_channel_table_index_for_channel_id(uint16_t channel_id){ 112 switch (channel_id){ 113 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 114 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL; 115 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 116 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL; 117 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 118 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL; 119 default: 120 return -1; 121 } 122 } 123 124 void l2cap_init(void){ 125 signaling_responses_pending = 0; 126 127 l2cap_channels = NULL; 128 l2cap_services = NULL; 129 l2cap_le_services = NULL; 130 l2cap_le_channels = NULL; 131 132 l2cap_event_packet_handler = NULL; 133 memset(fixed_channels, 0, sizeof(fixed_channels)); 134 135 require_security_level2_for_outgoing_sdp = 0; 136 137 // 138 // register callback with HCI 139 // 140 hci_event_callback_registration.callback = &l2cap_hci_event_handler; 141 hci_add_event_handler(&hci_event_callback_registration); 142 143 hci_register_acl_packet_handler(&l2cap_acl_handler); 144 145 hci_connectable_control(0); // no services yet 146 } 147 148 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 149 l2cap_event_packet_handler = handler; 150 } 151 152 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 153 (* (channel->packet_handler))(type, channel->local_cid, data, size); 154 } 155 156 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 157 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", 158 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 159 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 160 uint8_t event[23]; 161 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 162 event[1] = sizeof(event) - 2; 163 event[2] = status; 164 bt_flip_addr(&event[3], channel->address); 165 little_endian_store_16(event, 9, channel->handle); 166 little_endian_store_16(event, 11, channel->psm); 167 little_endian_store_16(event, 13, channel->local_cid); 168 little_endian_store_16(event, 15, channel->remote_cid); 169 little_endian_store_16(event, 17, channel->local_mtu); 170 little_endian_store_16(event, 19, channel->remote_mtu); 171 little_endian_store_16(event, 21, channel->flush_timeout); 172 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 173 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 174 175 // if channel opened successfully, also send can send now if possible 176 if (status) return; 177 if (hci_can_send_acl_packet_now(channel->handle)){ 178 l2cap_emit_can_send_now(channel); 179 } else { 180 channel->waiting_for_can_send_now = 1; 181 } 182 } 183 184 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 185 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 186 uint8_t event[4]; 187 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 188 event[1] = sizeof(event) - 2; 189 little_endian_store_16(event, 2, channel->local_cid); 190 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 191 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 192 } 193 194 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 195 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 196 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 197 uint8_t event[16]; 198 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 199 event[1] = sizeof(event) - 2; 200 bt_flip_addr(&event[2], channel->address); 201 little_endian_store_16(event, 8, channel->handle); 202 little_endian_store_16(event, 10, channel->psm); 203 little_endian_store_16(event, 12, channel->local_cid); 204 little_endian_store_16(event, 14, channel->remote_cid); 205 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 206 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 207 } 208 209 static void l2cap_emit_can_send_now(l2cap_channel_t *channel) { 210 log_info("L2CAP_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel->local_cid); 211 uint8_t event[4]; 212 event[0] = L2CAP_EVENT_CAN_SEND_NOW; 213 event[1] = sizeof(event) - 2; 214 little_endian_store_16(event, 2, channel->local_cid); 215 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 216 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 217 } 218 219 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 220 uint8_t event[6]; 221 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 222 event[1] = 4; 223 little_endian_store_16(event, 2, handle); 224 little_endian_store_16(event, 4, result); 225 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 226 if (!l2cap_event_packet_handler) return; 227 (*l2cap_event_packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 228 } 229 230 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 231 btstack_linked_list_iterator_t it; 232 btstack_linked_list_iterator_init(&it, &l2cap_channels); 233 while (btstack_linked_list_iterator_has_next(&it)){ 234 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 235 if ( channel->local_cid == local_cid) { 236 return channel; 237 } 238 } 239 return NULL; 240 } 241 242 int l2cap_can_send_packet_now(uint16_t local_cid){ 243 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 244 if (!channel) return 0; 245 int can_send = hci_can_send_acl_packet_now(channel->handle); 246 if (!can_send){ 247 channel->waiting_for_can_send_now = 1; 248 } 249 return can_send; 250 } 251 252 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 253 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 254 if (!channel) return 0; 255 int can_send = hci_can_send_prepared_acl_packet_now(channel->handle); 256 if (!can_send){ 257 channel->waiting_for_can_send_now = 1; 258 } 259 return can_send; 260 } 261 262 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle, uint16_t channel_id){ 263 int can_send = hci_can_send_acl_packet_now(handle); 264 if (!can_send){ 265 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 266 if (index >= 0){ 267 fixed_channels[index].waiting_for_can_send_now = 1; 268 } 269 } 270 return can_send; 271 } 272 273 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 274 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 275 if (channel) { 276 return channel->remote_mtu; 277 } 278 return 0; 279 } 280 281 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 282 btstack_linked_list_iterator_t it; 283 btstack_linked_list_iterator_init(&it, &l2cap_channels); 284 while (btstack_linked_list_iterator_has_next(&it)){ 285 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 286 if ( &channel->rtx == ts) { 287 return channel; 288 } 289 } 290 return NULL; 291 } 292 293 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 294 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 295 if (!ts) return; 296 297 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 298 299 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 300 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 301 // notify client 302 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 303 304 // discard channel 305 // no need to stop timer here, it is removed from list during timer callback 306 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 307 btstack_memory_l2cap_channel_free(channel); 308 } 309 310 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 311 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 312 btstack_run_loop_remove_timer(&channel->rtx); 313 } 314 315 static void l2cap_start_rtx(l2cap_channel_t * channel){ 316 l2cap_stop_rtx(channel); 317 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 318 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 319 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 320 btstack_run_loop_add_timer(&channel->rtx); 321 } 322 323 static void l2cap_start_ertx(l2cap_channel_t * channel){ 324 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 325 l2cap_stop_rtx(channel); 326 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 327 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 328 btstack_run_loop_add_timer(&channel->rtx); 329 } 330 331 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 332 require_security_level2_for_outgoing_sdp = 1; 333 } 334 335 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 336 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 337 } 338 339 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 340 341 if (!hci_can_send_acl_packet_now(handle)){ 342 log_info("l2cap_send_signaling_packet, cannot send"); 343 return BTSTACK_ACL_BUFFERS_FULL; 344 } 345 346 // log_info("l2cap_send_signaling_packet type %u", cmd); 347 hci_reserve_packet_buffer(); 348 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 349 va_list argptr; 350 va_start(argptr, identifier); 351 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 352 va_end(argptr); 353 // log_info("l2cap_send_signaling_packet con %u!", handle); 354 return hci_send_acl_packet_buffer(len); 355 } 356 357 #ifdef ENABLE_BLE 358 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 359 360 if (!hci_can_send_acl_packet_now(handle)){ 361 log_info("l2cap_send_signaling_packet, cannot send"); 362 return BTSTACK_ACL_BUFFERS_FULL; 363 } 364 365 // log_info("l2cap_send_signaling_packet type %u", cmd); 366 hci_reserve_packet_buffer(); 367 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 368 va_list argptr; 369 va_start(argptr, identifier); 370 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 371 va_end(argptr); 372 // log_info("l2cap_send_signaling_packet con %u!", handle); 373 return hci_send_acl_packet_buffer(len); 374 } 375 #endif 376 377 uint8_t *l2cap_get_outgoing_buffer(void){ 378 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 379 } 380 381 int l2cap_reserve_packet_buffer(void){ 382 return hci_reserve_packet_buffer(); 383 } 384 385 void l2cap_release_packet_buffer(void){ 386 hci_release_packet_buffer(); 387 } 388 389 390 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 391 392 if (!hci_is_packet_buffer_reserved()){ 393 log_error("l2cap_send_prepared called without reserving packet first"); 394 return BTSTACK_ACL_BUFFERS_FULL; 395 } 396 397 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 398 if (!channel) { 399 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 400 return -1; // TODO: define error 401 } 402 403 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 404 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 405 return BTSTACK_ACL_BUFFERS_FULL; 406 } 407 408 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 409 410 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 411 412 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 413 414 // 0 - Connection handle : PB=pb : BC=00 415 little_endian_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 416 // 2 - ACL length 417 little_endian_store_16(acl_buffer, 2, len + 4); 418 // 4 - L2CAP packet length 419 little_endian_store_16(acl_buffer, 4, len + 0); 420 // 6 - L2CAP channel DEST 421 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 422 // send 423 int err = hci_send_acl_packet_buffer(len+8); 424 425 return err; 426 } 427 428 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 429 430 if (!hci_is_packet_buffer_reserved()){ 431 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 432 return BTSTACK_ACL_BUFFERS_FULL; 433 } 434 435 if (!hci_can_send_prepared_acl_packet_now(handle)){ 436 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 437 return BTSTACK_ACL_BUFFERS_FULL; 438 } 439 440 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 441 442 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 443 444 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 445 446 // 0 - Connection handle : PB=pb : BC=00 447 little_endian_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 448 // 2 - ACL length 449 little_endian_store_16(acl_buffer, 2, len + 4); 450 // 4 - L2CAP packet length 451 little_endian_store_16(acl_buffer, 4, len + 0); 452 // 6 - L2CAP channel DEST 453 little_endian_store_16(acl_buffer, 6, cid); 454 // send 455 int err = hci_send_acl_packet_buffer(len+8); 456 457 return err; 458 } 459 460 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 461 462 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 463 if (!channel) { 464 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 465 return -1; // TODO: define error 466 } 467 468 if (len > channel->remote_mtu){ 469 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 470 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 471 } 472 473 if (!hci_can_send_acl_packet_now(channel->handle)){ 474 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 475 return BTSTACK_ACL_BUFFERS_FULL; 476 } 477 478 hci_reserve_packet_buffer(); 479 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 480 481 memcpy(&acl_buffer[8], data, len); 482 483 return l2cap_send_prepared(local_cid, len); 484 } 485 486 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 487 488 if (!hci_can_send_acl_packet_now(handle)){ 489 log_info("l2cap_send cid 0x%02x, cannot send", cid); 490 return BTSTACK_ACL_BUFFERS_FULL; 491 } 492 493 hci_reserve_packet_buffer(); 494 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 495 496 memcpy(&acl_buffer[8], data, len); 497 498 return l2cap_send_prepared_connectionless(handle, cid, len); 499 } 500 501 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 502 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 503 } 504 505 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 506 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 507 } 508 509 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 510 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 511 } 512 513 514 515 // MARK: L2CAP_RUN 516 // process outstanding signaling tasks 517 static void l2cap_run(void){ 518 519 // log_info("l2cap_run: entered"); 520 521 // check pending signaling responses 522 while (signaling_responses_pending){ 523 524 hci_con_handle_t handle = signaling_responses[0].handle; 525 526 if (!hci_can_send_acl_packet_now(handle)) break; 527 528 uint8_t sig_id = signaling_responses[0].sig_id; 529 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 530 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 531 uint8_t response_code = signaling_responses[0].code; 532 533 // remove first item before sending (to avoid sending response mutliple times) 534 signaling_responses_pending--; 535 int i; 536 for (i=0; i < signaling_responses_pending; i++){ 537 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 538 } 539 540 switch (response_code){ 541 case CONNECTION_REQUEST: 542 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 543 // also disconnect if result is 0x0003 - security blocked 544 if (result == 0x0003){ 545 hci_disconnect_security_block(handle); 546 } 547 break; 548 case ECHO_REQUEST: 549 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 550 break; 551 case INFORMATION_REQUEST: 552 switch (infoType){ 553 case 1: { // Connectionless MTU 554 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 555 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 556 break; 557 } 558 case 2: { // Extended Features Supported 559 // extended features request supported, features: fixed channels, unicast connectionless data reception 560 uint32_t features = 0x280; 561 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 562 break; 563 } 564 case 3: { // Fixed Channels Supported 565 uint8_t map[8]; 566 memset(map, 0, 8); 567 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 568 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 569 break; 570 } 571 default: 572 // all other types are not supported 573 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 574 break; 575 } 576 break; 577 case COMMAND_REJECT: 578 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 579 #ifdef ENABLE_BLE 580 case COMMAND_REJECT_LE: 581 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 582 break; 583 #endif 584 default: 585 // should not happen 586 break; 587 } 588 } 589 590 uint8_t config_options[4]; 591 btstack_linked_list_iterator_t it; 592 btstack_linked_list_iterator_init(&it, &l2cap_channels); 593 while (btstack_linked_list_iterator_has_next(&it)){ 594 595 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 596 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 597 switch (channel->state){ 598 599 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 600 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 601 if (!hci_can_send_acl_packet_now(channel->handle)) break; 602 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 603 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 604 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 605 } 606 break; 607 608 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 609 if (!hci_can_send_command_packet_now()) break; 610 // send connection request - set state first 611 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 612 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 613 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 614 break; 615 616 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 617 if (!hci_can_send_acl_packet_now(channel->handle)) break; 618 channel->state = L2CAP_STATE_INVALID; 619 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 620 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 621 l2cap_stop_rtx(channel); 622 btstack_linked_list_iterator_remove(&it); 623 btstack_memory_l2cap_channel_free(channel); 624 break; 625 626 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 627 if (!hci_can_send_acl_packet_now(channel->handle)) break; 628 channel->state = L2CAP_STATE_CONFIG; 629 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 630 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 631 break; 632 633 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 634 if (!hci_can_send_acl_packet_now(channel->handle)) break; 635 // success, start l2cap handshake 636 channel->local_sig_id = l2cap_next_sig_id(); 637 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 638 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 639 l2cap_start_rtx(channel); 640 break; 641 642 case L2CAP_STATE_CONFIG: 643 if (!hci_can_send_acl_packet_now(channel->handle)) break; 644 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 645 uint16_t flags = 0; 646 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 647 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 648 flags = 1; 649 } else { 650 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 651 } 652 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 653 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 654 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 655 config_options[0] = 1; // MTU 656 config_options[1] = 2; // len param 657 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 658 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 659 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 660 } else { 661 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 662 } 663 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 664 } 665 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 666 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 667 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 668 channel->local_sig_id = l2cap_next_sig_id(); 669 config_options[0] = 1; // MTU 670 config_options[1] = 2; // len param 671 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 672 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 673 l2cap_start_rtx(channel); 674 } 675 if (l2cap_channel_ready_for_open(channel)){ 676 channel->state = L2CAP_STATE_OPEN; 677 l2cap_emit_channel_opened(channel, 0); // success 678 } 679 break; 680 681 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 682 if (!hci_can_send_acl_packet_now(channel->handle)) break; 683 channel->state = L2CAP_STATE_INVALID; 684 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 685 // 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 :) 686 l2cap_finialize_channel_close(channel); // -- remove from list 687 break; 688 689 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 690 if (!hci_can_send_acl_packet_now(channel->handle)) break; 691 channel->local_sig_id = l2cap_next_sig_id(); 692 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 693 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 694 break; 695 default: 696 break; 697 } 698 } 699 700 #ifdef ENABLE_BLE 701 // send l2cap con paramter update if necessary 702 hci_connections_get_iterator(&it); 703 while(btstack_linked_list_iterator_has_next(&it)){ 704 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 705 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 706 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 707 switch (connection->le_con_parameter_update_state){ 708 case CON_PARAMETER_UPDATE_SEND_REQUEST: 709 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 710 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 711 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 712 break; 713 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 714 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 715 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 716 break; 717 case CON_PARAMETER_UPDATE_DENY: 718 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 719 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 720 break; 721 default: 722 break; 723 } 724 } 725 #endif 726 727 // log_info("l2cap_run: exit"); 728 } 729 730 uint16_t l2cap_max_mtu(void){ 731 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 732 } 733 734 uint16_t l2cap_max_le_mtu(void){ 735 return l2cap_max_mtu(); 736 } 737 738 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 739 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 740 log_info("l2cap_handle_connection_complete expected state"); 741 // success, start l2cap handshake 742 channel->handle = handle; 743 // check remote SSP feature first 744 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 745 } 746 } 747 748 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 749 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 750 751 // we have been waiting for remote supported features, if both support SSP, 752 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)); 753 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 754 // request security level 2 755 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 756 gap_request_security_level(channel->handle, LEVEL_2); 757 return; 758 } 759 // fine, go ahead 760 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 761 } 762 763 /** 764 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 765 * @param packet_handler 766 * @param address 767 * @param psm 768 * @param mtu 769 * @param local_cid 770 */ 771 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){ 772 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 773 774 // alloc structure 775 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 776 if (!chan) { 777 return BTSTACK_MEMORY_ALLOC_FAILED; 778 } 779 780 // Init memory (make valgrind happy) 781 memset(chan, 0, sizeof(l2cap_channel_t)); 782 // limit local mtu to max acl packet length - l2cap header 783 if (mtu > l2cap_max_mtu()) { 784 mtu = l2cap_max_mtu(); 785 } 786 787 // fill in 788 BD_ADDR_COPY(chan->address, address); 789 chan->psm = psm; 790 chan->handle = 0; 791 chan->packet_handler = channel_packet_handler; 792 chan->remote_mtu = L2CAP_MINIMAL_MTU; 793 chan->local_mtu = mtu; 794 chan->local_cid = l2cap_next_local_cid(); 795 796 // set initial state 797 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 798 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 799 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 800 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 801 chan->required_security_level = LEVEL_0; 802 803 // add to connections list 804 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 805 806 // store local_cid 807 if (out_local_cid){ 808 *out_local_cid = chan->local_cid; 809 } 810 811 // check if hci connection is already usable 812 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 813 if (conn){ 814 log_info("l2cap_create_channel, hci connection already exists"); 815 l2cap_handle_connection_complete(conn->con_handle, chan); 816 // check if remote supported fearures are already received 817 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 818 l2cap_handle_remote_supported_features_received(chan); 819 } 820 } 821 822 l2cap_run(); 823 824 return 0; 825 } 826 827 void 828 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 829 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 830 // find channel for local_cid 831 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 832 if (channel) { 833 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 834 } 835 // process 836 l2cap_run(); 837 } 838 839 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 840 btstack_linked_list_iterator_t it; 841 btstack_linked_list_iterator_init(&it, &l2cap_channels); 842 while (btstack_linked_list_iterator_has_next(&it)){ 843 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 844 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 845 // channel for this address found 846 switch (channel->state){ 847 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 848 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 849 // failure, forward error code 850 l2cap_emit_channel_opened(channel, status); 851 // discard channel 852 l2cap_stop_rtx(channel); 853 btstack_linked_list_iterator_remove(&it); 854 btstack_memory_l2cap_channel_free(channel); 855 break; 856 default: 857 break; 858 } 859 } 860 } 861 862 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 863 btstack_linked_list_iterator_t it; 864 btstack_linked_list_iterator_init(&it, &l2cap_channels); 865 while (btstack_linked_list_iterator_has_next(&it)){ 866 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 867 if ( ! BD_ADDR_CMP( channel->address, address) ){ 868 l2cap_handle_connection_complete(handle, channel); 869 } 870 } 871 // process 872 l2cap_run(); 873 } 874 875 static void l2cap_notify_channel_can_send(void){ 876 btstack_linked_list_iterator_t it; 877 btstack_linked_list_iterator_init(&it, &l2cap_channels); 878 while (btstack_linked_list_iterator_has_next(&it)){ 879 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 880 if (!channel->waiting_for_can_send_now) continue; 881 if (!hci_can_send_acl_packet_now(channel->handle)) continue; 882 channel->waiting_for_can_send_now = 0; 883 l2cap_emit_can_send_now(channel); 884 } 885 886 int i; 887 for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 888 if (!fixed_channels[i].waiting_for_can_send_now) continue; 889 // can we send now? 890 // 891 892 } 893 } 894 895 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 896 897 bd_addr_t address; 898 hci_con_handle_t handle; 899 btstack_linked_list_iterator_t it; 900 int hci_con_used; 901 902 switch(packet[0]){ 903 904 // handle connection complete events 905 case HCI_EVENT_CONNECTION_COMPLETE: 906 bt_flip_addr(address, &packet[5]); 907 if (packet[2] == 0){ 908 handle = little_endian_read_16(packet, 3); 909 l2cap_handle_connection_success_for_addr(address, handle); 910 } else { 911 l2cap_handle_connection_failed_for_addr(address, packet[2]); 912 } 913 break; 914 915 // handle successful create connection cancel command 916 case HCI_EVENT_COMMAND_COMPLETE: 917 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 918 if (packet[5] == 0){ 919 bt_flip_addr(address, &packet[6]); 920 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 921 l2cap_handle_connection_failed_for_addr(address, 0x16); 922 } 923 } 924 l2cap_run(); // try sending signaling packets first 925 break; 926 927 case HCI_EVENT_COMMAND_STATUS: 928 l2cap_run(); // try sending signaling packets first 929 break; 930 931 // handle disconnection complete events 932 case HCI_EVENT_DISCONNECTION_COMPLETE: 933 // send l2cap disconnect events for all channels on this handle and free them 934 handle = little_endian_read_16(packet, 3); 935 btstack_linked_list_iterator_init(&it, &l2cap_channels); 936 while (btstack_linked_list_iterator_has_next(&it)){ 937 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 938 if (channel->handle != handle) continue; 939 l2cap_emit_channel_closed(channel); 940 l2cap_stop_rtx(channel); 941 btstack_linked_list_iterator_remove(&it); 942 btstack_memory_l2cap_channel_free(channel); 943 } 944 break; 945 946 // Notify channel packet handler if they can send now 947 case DAEMON_EVENT_HCI_PACKET_SENT: 948 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 949 l2cap_run(); // try sending signaling packets first 950 l2cap_notify_channel_can_send(); 951 break; 952 953 // HCI Connection Timeouts 954 case L2CAP_EVENT_TIMEOUT_CHECK: 955 handle = little_endian_read_16(packet, 2); 956 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 957 if (hci_authentication_active_for_handle(handle)) break; 958 hci_con_used = 0; 959 btstack_linked_list_iterator_init(&it, &l2cap_channels); 960 while (btstack_linked_list_iterator_has_next(&it)){ 961 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 962 if (channel->handle != handle) continue; 963 hci_con_used = 1; 964 break; 965 } 966 if (hci_con_used) break; 967 if (!hci_can_send_command_packet_now()) break; 968 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 969 break; 970 971 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 972 handle = little_endian_read_16(packet, 3); 973 btstack_linked_list_iterator_init(&it, &l2cap_channels); 974 while (btstack_linked_list_iterator_has_next(&it)){ 975 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 976 if (channel->handle != handle) continue; 977 l2cap_handle_remote_supported_features_received(channel); 978 break; 979 } 980 break; 981 982 case GAP_EVENT_SECURITY_LEVEL: 983 handle = little_endian_read_16(packet, 2); 984 log_info("l2cap - security level update"); 985 btstack_linked_list_iterator_init(&it, &l2cap_channels); 986 while (btstack_linked_list_iterator_has_next(&it)){ 987 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 988 if (channel->handle != handle) continue; 989 990 log_info("l2cap - state %u", channel->state); 991 992 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 993 gap_security_level_t required_level = channel->required_security_level; 994 995 switch (channel->state){ 996 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 997 if (actual_level >= required_level){ 998 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 999 l2cap_emit_connection_request(channel); 1000 } else { 1001 channel->reason = 0x0003; // security block 1002 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1003 } 1004 break; 1005 1006 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1007 if (actual_level >= required_level){ 1008 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1009 } else { 1010 // disconnnect, authentication not good enough 1011 hci_disconnect_security_block(handle); 1012 } 1013 break; 1014 1015 default: 1016 break; 1017 } 1018 } 1019 break; 1020 1021 default: 1022 break; 1023 } 1024 1025 l2cap_run(); 1026 } 1027 1028 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1029 channel->remote_sig_id = identifier; 1030 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1031 l2cap_run(); 1032 } 1033 1034 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1035 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1036 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1037 signaling_responses[signaling_responses_pending].handle = handle; 1038 signaling_responses[signaling_responses_pending].code = code; 1039 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1040 signaling_responses[signaling_responses_pending].data = data; 1041 signaling_responses_pending++; 1042 l2cap_run(); 1043 } 1044 } 1045 1046 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1047 1048 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1049 l2cap_service_t *service = l2cap_get_service(psm); 1050 if (!service) { 1051 // 0x0002 PSM not supported 1052 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1053 return; 1054 } 1055 1056 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1057 if (!hci_connection) { 1058 // 1059 log_error("no hci_connection for handle %u", handle); 1060 return; 1061 } 1062 1063 // alloc structure 1064 // log_info("l2cap_handle_connection_request register channel"); 1065 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1066 if (!channel){ 1067 // 0x0004 No resources available 1068 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1069 return; 1070 } 1071 // Init memory (make valgrind happy) 1072 memset(channel, 0, sizeof(l2cap_channel_t)); 1073 // fill in 1074 BD_ADDR_COPY(channel->address, hci_connection->address); 1075 channel->psm = psm; 1076 channel->handle = handle; 1077 channel->packet_handler = service->packet_handler; 1078 channel->local_cid = l2cap_next_local_cid(); 1079 channel->remote_cid = source_cid; 1080 channel->local_mtu = service->mtu; 1081 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1082 channel->remote_sig_id = sig_id; 1083 channel->required_security_level = service->required_security_level; 1084 1085 // limit local mtu to max acl packet length - l2cap header 1086 if (channel->local_mtu > l2cap_max_mtu()) { 1087 channel->local_mtu = l2cap_max_mtu(); 1088 } 1089 1090 // set initial state 1091 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1092 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1093 1094 // add to connections list 1095 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1096 1097 // assert security requirements 1098 gap_request_security_level(handle, channel->required_security_level); 1099 } 1100 1101 void l2cap_accept_connection(uint16_t local_cid){ 1102 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1103 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1104 if (!channel) { 1105 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1106 return; 1107 } 1108 1109 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1110 1111 // process 1112 l2cap_run(); 1113 } 1114 1115 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1116 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1117 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1118 if (!channel) { 1119 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1120 return; 1121 } 1122 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1123 channel->reason = reason; 1124 l2cap_run(); 1125 } 1126 1127 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1128 1129 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1130 1131 uint16_t flags = little_endian_read_16(command, 6); 1132 if (flags & 1) { 1133 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1134 } 1135 1136 // accept the other's configuration options 1137 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1138 uint16_t pos = 8; 1139 while (pos < end_pos){ 1140 uint8_t option_hint = command[pos] >> 7; 1141 uint8_t option_type = command[pos] & 0x7f; 1142 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1143 pos++; 1144 uint8_t length = command[pos++]; 1145 // MTU { type(8): 1, len(8):2, MTU(16) } 1146 if (option_type == 1 && length == 2){ 1147 channel->remote_mtu = little_endian_read_16(command, pos); 1148 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1149 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1150 } 1151 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1152 if (option_type == 2 && length == 2){ 1153 channel->flush_timeout = little_endian_read_16(command, pos); 1154 } 1155 // check for unknown options 1156 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1157 log_info("l2cap cid %u, unknown options", channel->local_cid); 1158 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1159 } 1160 pos += length; 1161 } 1162 } 1163 1164 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1165 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1166 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1167 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1168 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1169 if (channel->state == L2CAP_STATE_OPEN) return 0; 1170 return 1; 1171 } 1172 1173 1174 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1175 1176 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1177 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1178 uint16_t result = 0; 1179 1180 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1181 1182 // handle DISCONNECT REQUESTS seperately 1183 if (code == DISCONNECTION_REQUEST){ 1184 switch (channel->state){ 1185 case L2CAP_STATE_CONFIG: 1186 case L2CAP_STATE_OPEN: 1187 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1188 case L2CAP_STATE_WAIT_DISCONNECT: 1189 l2cap_handle_disconnect_request(channel, identifier); 1190 break; 1191 1192 default: 1193 // ignore in other states 1194 break; 1195 } 1196 return; 1197 } 1198 1199 // @STATEMACHINE(l2cap) 1200 switch (channel->state) { 1201 1202 case L2CAP_STATE_WAIT_CONNECT_RSP: 1203 switch (code){ 1204 case CONNECTION_RESPONSE: 1205 l2cap_stop_rtx(channel); 1206 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1207 switch (result) { 1208 case 0: 1209 // successful connection 1210 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1211 channel->state = L2CAP_STATE_CONFIG; 1212 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1213 break; 1214 case 1: 1215 // connection pending. get some coffee, but start the ERTX 1216 l2cap_start_ertx(channel); 1217 break; 1218 default: 1219 // channel closed 1220 channel->state = L2CAP_STATE_CLOSED; 1221 // map l2cap connection response result to BTstack status enumeration 1222 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1223 1224 // drop link key if security block 1225 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1226 hci_drop_link_key_for_bd_addr(channel->address); 1227 } 1228 1229 // discard channel 1230 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1231 btstack_memory_l2cap_channel_free(channel); 1232 break; 1233 } 1234 break; 1235 1236 default: 1237 //@TODO: implement other signaling packets 1238 break; 1239 } 1240 break; 1241 1242 case L2CAP_STATE_CONFIG: 1243 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1244 switch (code) { 1245 case CONFIGURE_REQUEST: 1246 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1247 l2cap_signaling_handle_configure_request(channel, command); 1248 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1249 // only done if continuation not set 1250 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1251 } 1252 break; 1253 case CONFIGURE_RESPONSE: 1254 l2cap_stop_rtx(channel); 1255 switch (result){ 1256 case 0: // success 1257 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1258 break; 1259 case 4: // pending 1260 l2cap_start_ertx(channel); 1261 break; 1262 default: 1263 // retry on negative result 1264 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1265 break; 1266 } 1267 break; 1268 default: 1269 break; 1270 } 1271 if (l2cap_channel_ready_for_open(channel)){ 1272 // for open: 1273 channel->state = L2CAP_STATE_OPEN; 1274 l2cap_emit_channel_opened(channel, 0); 1275 } 1276 break; 1277 1278 case L2CAP_STATE_WAIT_DISCONNECT: 1279 switch (code) { 1280 case DISCONNECTION_RESPONSE: 1281 l2cap_finialize_channel_close(channel); 1282 break; 1283 default: 1284 //@TODO: implement other signaling packets 1285 break; 1286 } 1287 break; 1288 1289 case L2CAP_STATE_CLOSED: 1290 // @TODO handle incoming requests 1291 break; 1292 1293 case L2CAP_STATE_OPEN: 1294 //@TODO: implement other signaling packets, e.g. re-configure 1295 break; 1296 default: 1297 break; 1298 } 1299 // log_info("new state %u", channel->state); 1300 } 1301 1302 1303 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1304 1305 // get code, signalind identifier and command len 1306 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1307 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1308 1309 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1310 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1311 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1312 return; 1313 } 1314 1315 // general commands without an assigned channel 1316 switch(code) { 1317 1318 case CONNECTION_REQUEST: { 1319 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1320 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1321 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1322 return; 1323 } 1324 1325 case ECHO_REQUEST: 1326 l2cap_register_signaling_response(handle, code, sig_id, 0); 1327 return; 1328 1329 case INFORMATION_REQUEST: { 1330 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1331 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1332 return; 1333 } 1334 1335 default: 1336 break; 1337 } 1338 1339 1340 // Get potential destination CID 1341 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1342 1343 // Find channel for this sig_id and connection handle 1344 btstack_linked_list_iterator_t it; 1345 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1346 while (btstack_linked_list_iterator_has_next(&it)){ 1347 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1348 if (channel->handle != handle) continue; 1349 if (code & 1) { 1350 // match odd commands (responses) by previous signaling identifier 1351 if (channel->local_sig_id == sig_id) { 1352 l2cap_signaling_handler_channel(channel, command); 1353 break; 1354 } 1355 } else { 1356 // match even commands (requests) by local channel id 1357 if (channel->local_cid == dest_cid) { 1358 l2cap_signaling_handler_channel(channel, command); 1359 break; 1360 } 1361 } 1362 } 1363 } 1364 1365 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ){ 1366 1367 // Get Channel ID 1368 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1369 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1370 1371 switch (channel_id) { 1372 1373 case L2CAP_CID_SIGNALING: { 1374 1375 uint16_t command_offset = 8; 1376 while (command_offset < size) { 1377 1378 // handle signaling commands 1379 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1380 1381 // increment command_offset 1382 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1383 } 1384 break; 1385 } 1386 1387 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1388 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1389 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1390 } 1391 break; 1392 1393 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1394 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1395 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1396 } 1397 break; 1398 1399 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1400 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1401 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1402 } 1403 break; 1404 1405 case L2CAP_CID_SIGNALING_LE: { 1406 switch (packet[8]){ 1407 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1408 uint16_t result = little_endian_read_16(packet, 12); 1409 l2cap_emit_connection_parameter_update_response(handle, result); 1410 break; 1411 } 1412 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1413 uint8_t event[10]; 1414 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1415 event[1] = 8; 1416 memcpy(&event[2], &packet[12], 8); 1417 1418 hci_connection_t * connection = hci_connection_for_handle(handle); 1419 if (connection){ 1420 if (connection->role != HCI_ROLE_MASTER){ 1421 // reject command without notifying upper layer when not in master role 1422 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1423 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1424 break; 1425 } 1426 int update_parameter = 1; 1427 le_connection_parameter_range_t existing_range; 1428 gap_le_get_connection_parameter_range(existing_range); 1429 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1430 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1431 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1432 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1433 1434 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1435 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1436 1437 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1438 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1439 1440 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1441 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1442 1443 if (update_parameter){ 1444 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1445 connection->le_conn_interval_min = le_conn_interval_min; 1446 connection->le_conn_interval_max = le_conn_interval_max; 1447 connection->le_conn_latency = le_conn_latency; 1448 connection->le_supervision_timeout = le_supervision_timeout; 1449 } else { 1450 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1451 } 1452 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1453 } 1454 1455 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1456 if (!l2cap_event_packet_handler) break; 1457 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1458 break; 1459 } 1460 default: { 1461 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1462 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1463 break; 1464 } 1465 } 1466 break; 1467 } 1468 1469 default: { 1470 // Find channel for this channel_id and connection handle 1471 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1472 if (channel) { 1473 l2cap_dispatch_to_channel(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1474 } 1475 break; 1476 } 1477 } 1478 1479 l2cap_run(); 1480 } 1481 1482 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1483 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1484 channel->state = L2CAP_STATE_CLOSED; 1485 l2cap_emit_channel_closed(channel); 1486 // discard channel 1487 l2cap_stop_rtx(channel); 1488 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1489 btstack_memory_l2cap_channel_free(channel); 1490 } 1491 1492 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1493 btstack_linked_list_iterator_t it; 1494 btstack_linked_list_iterator_init(&it, services); 1495 while (btstack_linked_list_iterator_has_next(&it)){ 1496 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1497 if ( service->psm == psm){ 1498 return service; 1499 }; 1500 } 1501 return NULL; 1502 } 1503 1504 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1505 return l2cap_get_service_internal(&l2cap_services, psm); 1506 } 1507 1508 1509 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1510 1511 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1512 1513 // check for alread registered psm 1514 // TODO: emit error event 1515 l2cap_service_t *service = l2cap_get_service(psm); 1516 if (service) { 1517 log_error("l2cap_register_service: PSM %u already registered", psm); 1518 return L2CAP_SERVICE_ALREADY_REGISTERED; 1519 } 1520 1521 // alloc structure 1522 // TODO: emit error event 1523 service = btstack_memory_l2cap_service_get(); 1524 if (!service) { 1525 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1526 return BTSTACK_MEMORY_ALLOC_FAILED; 1527 } 1528 1529 // fill in 1530 service->psm = psm; 1531 service->mtu = mtu; 1532 service->packet_handler = service_packet_handler; 1533 service->required_security_level = security_level; 1534 1535 // add to services list 1536 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1537 1538 // enable page scan 1539 hci_connectable_control(1); 1540 1541 return 0; 1542 } 1543 1544 void l2cap_unregister_service(uint16_t psm){ 1545 1546 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1547 1548 l2cap_service_t *service = l2cap_get_service(psm); 1549 if (!service) return; 1550 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1551 btstack_memory_l2cap_service_free(service); 1552 1553 // disable page scan when no services registered 1554 if (!btstack_linked_list_empty(&l2cap_services)) return; 1555 hci_connectable_control(0); 1556 } 1557 1558 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1559 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1560 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 1561 if (index < 0) return; 1562 fixed_channels[index].callback = the_packet_handler; 1563 } 1564 1565 #ifdef ENABLE_BLE 1566 1567 1568 #if 0 1569 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1570 return l2cap_get_service_internal(&l2cap_le_services, psm); 1571 } 1572 /** 1573 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1574 * @param 1575 */ 1576 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1577 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1578 1579 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1580 1581 // check for alread registered psm 1582 // TODO: emit error event 1583 l2cap_service_t *service = l2cap_le_get_service(psm); 1584 if (service) { 1585 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1586 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1587 return; 1588 } 1589 1590 // alloc structure 1591 // TODO: emit error event 1592 service = btstack_memory_l2cap_service_get(); 1593 if (!service) { 1594 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1595 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1596 return; 1597 } 1598 1599 // fill in 1600 service->psm = psm; 1601 service->mtu = mtu; 1602 service->mps = mps; 1603 service->packet_handler = packet_handler; 1604 service->required_security_level = security_level; 1605 1606 // add to services list 1607 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1608 1609 // done 1610 l2cap_emit_service_registered(connection, 0, psm); 1611 } 1612 1613 void l2cap_le_unregister_service(uint16_t psm) { 1614 1615 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1616 1617 l2cap_service_t *service = l2cap_le_get_service(psm); 1618 if (!service) return; 1619 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1620 btstack_memory_l2cap_service_free(service); 1621 } 1622 #endif 1623 #endif 1624