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