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(btstack_packet_handler_t packet_handler, uint16_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 uint16_t l2cap_fixed_channel_table_channel_id_for_index(int index){ 108 switch (index){ 109 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL: 110 return L2CAP_CID_ATTRIBUTE_PROTOCOL; 111 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL: 112 return L2CAP_CID_SECURITY_MANAGER_PROTOCOL; 113 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL: 114 return L2CAP_CID_CONNECTIONLESS_CHANNEL; 115 default: 116 return 0; 117 } 118 } 119 static int l2cap_fixed_channel_table_index_for_channel_id(uint16_t channel_id){ 120 switch (channel_id){ 121 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 122 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL; 123 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 124 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL; 125 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 126 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL; 127 default: 128 return -1; 129 } 130 } 131 132 static int l2cap_fixed_channel_table_index_is_le(int index){ 133 if (index == L2CAP_CID_CONNECTIONLESS_CHANNEL) return 0; 134 return 1; 135 } 136 137 void l2cap_init(void){ 138 signaling_responses_pending = 0; 139 140 l2cap_channels = NULL; 141 l2cap_services = NULL; 142 l2cap_le_services = NULL; 143 l2cap_le_channels = NULL; 144 145 l2cap_event_packet_handler = NULL; 146 memset(fixed_channels, 0, sizeof(fixed_channels)); 147 148 require_security_level2_for_outgoing_sdp = 0; 149 150 // 151 // register callback with HCI 152 // 153 hci_event_callback_registration.callback = &l2cap_hci_event_handler; 154 hci_add_event_handler(&hci_event_callback_registration); 155 156 hci_register_acl_packet_handler(&l2cap_acl_handler); 157 158 hci_connectable_control(0); // no services yet 159 } 160 161 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 162 l2cap_event_packet_handler = handler; 163 } 164 165 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 166 (* (channel->packet_handler))(type, channel->local_cid, data, size); 167 } 168 169 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 170 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", 171 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 172 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 173 uint8_t event[23]; 174 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 175 event[1] = sizeof(event) - 2; 176 event[2] = status; 177 reverse_bd_addr(channel->address, &event[3]); 178 little_endian_store_16(event, 9, channel->handle); 179 little_endian_store_16(event, 11, channel->psm); 180 little_endian_store_16(event, 13, channel->local_cid); 181 little_endian_store_16(event, 15, channel->remote_cid); 182 little_endian_store_16(event, 17, channel->local_mtu); 183 little_endian_store_16(event, 19, channel->remote_mtu); 184 little_endian_store_16(event, 21, channel->flush_timeout); 185 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 186 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 187 188 // if channel opened successfully, also send can send now if possible 189 if (status) return; 190 if (hci_can_send_acl_packet_now(channel->handle)){ 191 l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 192 } else { 193 channel->waiting_for_can_send_now = 1; 194 } 195 } 196 197 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 198 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 199 uint8_t event[4]; 200 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 201 event[1] = sizeof(event) - 2; 202 little_endian_store_16(event, 2, channel->local_cid); 203 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 204 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 205 } 206 207 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 208 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 209 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 210 uint8_t event[16]; 211 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 212 event[1] = sizeof(event) - 2; 213 reverse_bd_addr(channel->address, &event[2]); 214 little_endian_store_16(event, 8, channel->handle); 215 little_endian_store_16(event, 10, channel->psm); 216 little_endian_store_16(event, 12, channel->local_cid); 217 little_endian_store_16(event, 14, channel->remote_cid); 218 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 219 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 220 } 221 222 static void l2cap_emit_can_send_now(btstack_packet_handler_t packet_handler, uint16_t channel) { 223 log_info("L2CAP_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel); 224 uint8_t event[4]; 225 event[0] = L2CAP_EVENT_CAN_SEND_NOW; 226 event[1] = sizeof(event) - 2; 227 little_endian_store_16(event, 2, channel); 228 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 229 packet_handler(HCI_EVENT_PACKET, channel, event, sizeof(event)); 230 } 231 232 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 233 uint8_t event[6]; 234 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 235 event[1] = 4; 236 little_endian_store_16(event, 2, handle); 237 little_endian_store_16(event, 4, result); 238 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 239 if (!l2cap_event_packet_handler) return; 240 (*l2cap_event_packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 241 } 242 243 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 244 btstack_linked_list_iterator_t it; 245 btstack_linked_list_iterator_init(&it, &l2cap_channels); 246 while (btstack_linked_list_iterator_has_next(&it)){ 247 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 248 if ( channel->local_cid == local_cid) { 249 return channel; 250 } 251 } 252 return NULL; 253 } 254 255 int l2cap_can_send_packet_now(uint16_t local_cid){ 256 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 257 if (!channel) return 0; 258 int can_send = hci_can_send_acl_packet_now(channel->handle); 259 if (!can_send){ 260 channel->waiting_for_can_send_now = 1; 261 } 262 return can_send; 263 } 264 265 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 266 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 267 if (!channel) return 0; 268 int can_send = hci_can_send_prepared_acl_packet_now(channel->handle); 269 if (!can_send){ 270 channel->waiting_for_can_send_now = 1; 271 } 272 return can_send; 273 } 274 275 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle, uint16_t channel_id){ 276 int can_send = hci_can_send_acl_packet_now(handle); 277 if (!can_send){ 278 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 279 if (index >= 0){ 280 fixed_channels[index].waiting_for_can_send_now = 1; 281 } 282 } 283 return can_send; 284 } 285 286 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 287 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 288 if (channel) { 289 return channel->remote_mtu; 290 } 291 return 0; 292 } 293 294 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 295 btstack_linked_list_iterator_t it; 296 btstack_linked_list_iterator_init(&it, &l2cap_channels); 297 while (btstack_linked_list_iterator_has_next(&it)){ 298 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 299 if ( &channel->rtx == ts) { 300 return channel; 301 } 302 } 303 return NULL; 304 } 305 306 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 307 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 308 if (!ts) return; 309 310 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 311 312 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 313 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 314 // notify client 315 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 316 317 // discard channel 318 // no need to stop timer here, it is removed from list during timer callback 319 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 320 btstack_memory_l2cap_channel_free(channel); 321 } 322 323 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 324 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 325 btstack_run_loop_remove_timer(&channel->rtx); 326 } 327 328 static void l2cap_start_rtx(l2cap_channel_t * channel){ 329 l2cap_stop_rtx(channel); 330 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 331 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 332 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 333 btstack_run_loop_add_timer(&channel->rtx); 334 } 335 336 static void l2cap_start_ertx(l2cap_channel_t * channel){ 337 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 338 l2cap_stop_rtx(channel); 339 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 340 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 341 btstack_run_loop_add_timer(&channel->rtx); 342 } 343 344 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 345 require_security_level2_for_outgoing_sdp = 1; 346 } 347 348 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 349 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 350 } 351 352 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 353 354 if (!hci_can_send_acl_packet_now(handle)){ 355 log_info("l2cap_send_signaling_packet, cannot send"); 356 return BTSTACK_ACL_BUFFERS_FULL; 357 } 358 359 // log_info("l2cap_send_signaling_packet type %u", cmd); 360 hci_reserve_packet_buffer(); 361 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 362 va_list argptr; 363 va_start(argptr, identifier); 364 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 365 va_end(argptr); 366 // log_info("l2cap_send_signaling_packet con %u!", handle); 367 return hci_send_acl_packet_buffer(len); 368 } 369 370 #ifdef ENABLE_BLE 371 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 372 373 if (!hci_can_send_acl_packet_now(handle)){ 374 log_info("l2cap_send_signaling_packet, cannot send"); 375 return BTSTACK_ACL_BUFFERS_FULL; 376 } 377 378 // log_info("l2cap_send_signaling_packet type %u", cmd); 379 hci_reserve_packet_buffer(); 380 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 381 va_list argptr; 382 va_start(argptr, identifier); 383 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 384 va_end(argptr); 385 // log_info("l2cap_send_signaling_packet con %u!", handle); 386 return hci_send_acl_packet_buffer(len); 387 } 388 #endif 389 390 uint8_t *l2cap_get_outgoing_buffer(void){ 391 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 392 } 393 394 int l2cap_reserve_packet_buffer(void){ 395 return hci_reserve_packet_buffer(); 396 } 397 398 void l2cap_release_packet_buffer(void){ 399 hci_release_packet_buffer(); 400 } 401 402 403 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 404 405 if (!hci_is_packet_buffer_reserved()){ 406 log_error("l2cap_send_prepared called without reserving packet first"); 407 return BTSTACK_ACL_BUFFERS_FULL; 408 } 409 410 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 411 if (!channel) { 412 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 413 return -1; // TODO: define error 414 } 415 416 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 417 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 418 return BTSTACK_ACL_BUFFERS_FULL; 419 } 420 421 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->handle); 422 423 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 424 425 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 426 427 // 0 - Connection handle : PB=pb : BC=00 428 little_endian_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 429 // 2 - ACL length 430 little_endian_store_16(acl_buffer, 2, len + 4); 431 // 4 - L2CAP packet length 432 little_endian_store_16(acl_buffer, 4, len + 0); 433 // 6 - L2CAP channel DEST 434 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 435 // send 436 int err = hci_send_acl_packet_buffer(len+8); 437 438 return err; 439 } 440 441 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 442 443 if (!hci_is_packet_buffer_reserved()){ 444 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 445 return BTSTACK_ACL_BUFFERS_FULL; 446 } 447 448 if (!hci_can_send_prepared_acl_packet_now(handle)){ 449 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 450 return BTSTACK_ACL_BUFFERS_FULL; 451 } 452 453 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 454 455 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 456 457 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 458 459 // 0 - Connection handle : PB=pb : BC=00 460 little_endian_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 461 // 2 - ACL length 462 little_endian_store_16(acl_buffer, 2, len + 4); 463 // 4 - L2CAP packet length 464 little_endian_store_16(acl_buffer, 4, len + 0); 465 // 6 - L2CAP channel DEST 466 little_endian_store_16(acl_buffer, 6, cid); 467 // send 468 int err = hci_send_acl_packet_buffer(len+8); 469 470 return err; 471 } 472 473 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 474 475 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 476 if (!channel) { 477 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 478 return -1; // TODO: define error 479 } 480 481 if (len > channel->remote_mtu){ 482 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 483 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 484 } 485 486 if (!hci_can_send_acl_packet_now(channel->handle)){ 487 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 488 return BTSTACK_ACL_BUFFERS_FULL; 489 } 490 491 hci_reserve_packet_buffer(); 492 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 493 494 memcpy(&acl_buffer[8], data, len); 495 496 return l2cap_send_prepared(local_cid, len); 497 } 498 499 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 500 501 if (!hci_can_send_acl_packet_now(handle)){ 502 log_info("l2cap_send cid 0x%02x, cannot send", cid); 503 return BTSTACK_ACL_BUFFERS_FULL; 504 } 505 506 hci_reserve_packet_buffer(); 507 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 508 509 memcpy(&acl_buffer[8], data, len); 510 511 return l2cap_send_prepared_connectionless(handle, cid, len); 512 } 513 514 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 515 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 516 } 517 518 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 519 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 520 } 521 522 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 523 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 524 } 525 526 527 528 // MARK: L2CAP_RUN 529 // process outstanding signaling tasks 530 static void l2cap_run(void){ 531 532 // log_info("l2cap_run: entered"); 533 534 // check pending signaling responses 535 while (signaling_responses_pending){ 536 537 hci_con_handle_t handle = signaling_responses[0].handle; 538 539 if (!hci_can_send_acl_packet_now(handle)) break; 540 541 uint8_t sig_id = signaling_responses[0].sig_id; 542 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 543 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 544 uint8_t response_code = signaling_responses[0].code; 545 546 // remove first item before sending (to avoid sending response mutliple times) 547 signaling_responses_pending--; 548 int i; 549 for (i=0; i < signaling_responses_pending; i++){ 550 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 551 } 552 553 switch (response_code){ 554 case CONNECTION_REQUEST: 555 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 556 // also disconnect if result is 0x0003 - security blocked 557 if (result == 0x0003){ 558 hci_disconnect_security_block(handle); 559 } 560 break; 561 case ECHO_REQUEST: 562 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 563 break; 564 case INFORMATION_REQUEST: 565 switch (infoType){ 566 case 1: { // Connectionless MTU 567 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 568 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 569 break; 570 } 571 case 2: { // Extended Features Supported 572 // extended features request supported, features: fixed channels, unicast connectionless data reception 573 uint32_t features = 0x280; 574 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 575 break; 576 } 577 case 3: { // Fixed Channels Supported 578 uint8_t map[8]; 579 memset(map, 0, 8); 580 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 581 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 582 break; 583 } 584 default: 585 // all other types are not supported 586 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 587 break; 588 } 589 break; 590 case COMMAND_REJECT: 591 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 592 #ifdef ENABLE_BLE 593 case COMMAND_REJECT_LE: 594 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 595 break; 596 #endif 597 default: 598 // should not happen 599 break; 600 } 601 } 602 603 uint8_t config_options[4]; 604 btstack_linked_list_iterator_t it; 605 btstack_linked_list_iterator_init(&it, &l2cap_channels); 606 while (btstack_linked_list_iterator_has_next(&it)){ 607 608 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 609 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 610 switch (channel->state){ 611 612 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 613 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 614 if (!hci_can_send_acl_packet_now(channel->handle)) break; 615 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 616 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 617 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 618 } 619 break; 620 621 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 622 if (!hci_can_send_command_packet_now()) break; 623 // send connection request - set state first 624 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 625 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 626 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 627 break; 628 629 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 630 if (!hci_can_send_acl_packet_now(channel->handle)) break; 631 channel->state = L2CAP_STATE_INVALID; 632 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 633 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 634 l2cap_stop_rtx(channel); 635 btstack_linked_list_iterator_remove(&it); 636 btstack_memory_l2cap_channel_free(channel); 637 break; 638 639 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 640 if (!hci_can_send_acl_packet_now(channel->handle)) break; 641 channel->state = L2CAP_STATE_CONFIG; 642 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 643 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 644 break; 645 646 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 647 if (!hci_can_send_acl_packet_now(channel->handle)) break; 648 // success, start l2cap handshake 649 channel->local_sig_id = l2cap_next_sig_id(); 650 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 651 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 652 l2cap_start_rtx(channel); 653 break; 654 655 case L2CAP_STATE_CONFIG: 656 if (!hci_can_send_acl_packet_now(channel->handle)) break; 657 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 658 uint16_t flags = 0; 659 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 660 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 661 flags = 1; 662 } else { 663 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 664 } 665 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 666 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 667 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 668 config_options[0] = 1; // MTU 669 config_options[1] = 2; // len param 670 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 671 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 672 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 673 } else { 674 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 675 } 676 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 677 } 678 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 679 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 680 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 681 channel->local_sig_id = l2cap_next_sig_id(); 682 config_options[0] = 1; // MTU 683 config_options[1] = 2; // len param 684 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 685 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 686 l2cap_start_rtx(channel); 687 } 688 if (l2cap_channel_ready_for_open(channel)){ 689 channel->state = L2CAP_STATE_OPEN; 690 l2cap_emit_channel_opened(channel, 0); // success 691 } 692 break; 693 694 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 695 if (!hci_can_send_acl_packet_now(channel->handle)) break; 696 channel->state = L2CAP_STATE_INVALID; 697 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 698 // 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 :) 699 l2cap_finialize_channel_close(channel); // -- remove from list 700 break; 701 702 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 703 if (!hci_can_send_acl_packet_now(channel->handle)) break; 704 channel->local_sig_id = l2cap_next_sig_id(); 705 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 706 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 707 break; 708 default: 709 break; 710 } 711 } 712 713 #ifdef ENABLE_BLE 714 // send l2cap con paramter update if necessary 715 hci_connections_get_iterator(&it); 716 while(btstack_linked_list_iterator_has_next(&it)){ 717 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 718 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 719 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 720 switch (connection->le_con_parameter_update_state){ 721 case CON_PARAMETER_UPDATE_SEND_REQUEST: 722 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 723 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 724 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 725 break; 726 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 727 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 728 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 729 break; 730 case CON_PARAMETER_UPDATE_DENY: 731 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 732 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 733 break; 734 default: 735 break; 736 } 737 } 738 #endif 739 740 // log_info("l2cap_run: exit"); 741 } 742 743 uint16_t l2cap_max_mtu(void){ 744 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 745 } 746 747 uint16_t l2cap_max_le_mtu(void){ 748 return l2cap_max_mtu(); 749 } 750 751 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 752 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 753 log_info("l2cap_handle_connection_complete expected state"); 754 // success, start l2cap handshake 755 channel->handle = handle; 756 // check remote SSP feature first 757 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 758 } 759 } 760 761 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 762 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 763 764 // we have been waiting for remote supported features, if both support SSP, 765 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)); 766 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 767 // request security level 2 768 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 769 gap_request_security_level(channel->handle, LEVEL_2); 770 return; 771 } 772 // fine, go ahead 773 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 774 } 775 776 /** 777 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 778 * @param packet_handler 779 * @param address 780 * @param psm 781 * @param mtu 782 * @param local_cid 783 */ 784 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){ 785 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 786 787 // alloc structure 788 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 789 if (!chan) { 790 return BTSTACK_MEMORY_ALLOC_FAILED; 791 } 792 793 // Init memory (make valgrind happy) 794 memset(chan, 0, sizeof(l2cap_channel_t)); 795 // limit local mtu to max acl packet length - l2cap header 796 if (mtu > l2cap_max_mtu()) { 797 mtu = l2cap_max_mtu(); 798 } 799 800 // fill in 801 bd_addr_copy(chan->address, address); 802 chan->psm = psm; 803 chan->handle = 0; 804 chan->packet_handler = channel_packet_handler; 805 chan->remote_mtu = L2CAP_MINIMAL_MTU; 806 chan->local_mtu = mtu; 807 chan->local_cid = l2cap_next_local_cid(); 808 809 // set initial state 810 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 811 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 812 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 813 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 814 chan->required_security_level = LEVEL_0; 815 816 // add to connections list 817 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) chan); 818 819 // store local_cid 820 if (out_local_cid){ 821 *out_local_cid = chan->local_cid; 822 } 823 824 // check if hci connection is already usable 825 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 826 if (conn){ 827 log_info("l2cap_create_channel, hci connection already exists"); 828 l2cap_handle_connection_complete(conn->con_handle, chan); 829 // check if remote supported fearures are already received 830 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 831 l2cap_handle_remote_supported_features_received(chan); 832 } 833 } 834 835 l2cap_run(); 836 837 return 0; 838 } 839 840 void 841 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 842 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 843 // find channel for local_cid 844 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 845 if (channel) { 846 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 847 } 848 // process 849 l2cap_run(); 850 } 851 852 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 853 btstack_linked_list_iterator_t it; 854 btstack_linked_list_iterator_init(&it, &l2cap_channels); 855 while (btstack_linked_list_iterator_has_next(&it)){ 856 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 857 if ( bd_addr_cmp( channel->address, address) != 0) continue; 858 // channel for this address found 859 switch (channel->state){ 860 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 861 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 862 // failure, forward error code 863 l2cap_emit_channel_opened(channel, status); 864 // discard channel 865 l2cap_stop_rtx(channel); 866 btstack_linked_list_iterator_remove(&it); 867 btstack_memory_l2cap_channel_free(channel); 868 break; 869 default: 870 break; 871 } 872 } 873 } 874 875 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 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 ( ! bd_addr_cmp( channel->address, address) ){ 881 l2cap_handle_connection_complete(handle, channel); 882 } 883 } 884 // process 885 l2cap_run(); 886 } 887 888 static void l2cap_notify_channel_can_send(void){ 889 btstack_linked_list_iterator_t it; 890 btstack_linked_list_iterator_init(&it, &l2cap_channels); 891 while (btstack_linked_list_iterator_has_next(&it)){ 892 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 893 if (!channel->waiting_for_can_send_now) continue; 894 if (!hci_can_send_acl_packet_now(channel->handle)) continue; 895 channel->waiting_for_can_send_now = 0; 896 l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 897 } 898 899 int i; 900 for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 901 if (!fixed_channels[i].callback) continue; 902 if (!fixed_channels[i].waiting_for_can_send_now) continue; 903 int can_send; 904 if (l2cap_fixed_channel_table_index_is_le(i)){ 905 can_send = hci_can_send_acl_le_packet_now(); 906 } else { 907 can_send = hci_can_send_acl_classic_packet_now(); 908 } 909 if (!can_send) continue; 910 fixed_channels[i].waiting_for_can_send_now = 0; 911 l2cap_emit_can_send_now(fixed_channels[i].callback, l2cap_fixed_channel_table_channel_id_for_index(i)); 912 } 913 } 914 915 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 916 917 bd_addr_t address; 918 hci_con_handle_t handle; 919 btstack_linked_list_iterator_t it; 920 int hci_con_used; 921 922 switch(packet[0]){ 923 924 // handle connection complete events 925 case HCI_EVENT_CONNECTION_COMPLETE: 926 reverse_bd_addr(&packet[5], address); 927 if (packet[2] == 0){ 928 handle = little_endian_read_16(packet, 3); 929 l2cap_handle_connection_success_for_addr(address, handle); 930 } else { 931 l2cap_handle_connection_failed_for_addr(address, packet[2]); 932 } 933 break; 934 935 // handle successful create connection cancel command 936 case HCI_EVENT_COMMAND_COMPLETE: 937 if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_create_connection_cancel)) { 938 if (packet[5] == 0){ 939 reverse_bd_addr(&packet[6], address); 940 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 941 l2cap_handle_connection_failed_for_addr(address, 0x16); 942 } 943 } 944 l2cap_run(); // try sending signaling packets first 945 break; 946 947 case HCI_EVENT_COMMAND_STATUS: 948 l2cap_run(); // try sending signaling packets first 949 break; 950 951 // handle disconnection complete events 952 case HCI_EVENT_DISCONNECTION_COMPLETE: 953 // send l2cap disconnect events for all channels on this handle and free them 954 handle = little_endian_read_16(packet, 3); 955 btstack_linked_list_iterator_init(&it, &l2cap_channels); 956 while (btstack_linked_list_iterator_has_next(&it)){ 957 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 958 if (channel->handle != handle) continue; 959 l2cap_emit_channel_closed(channel); 960 l2cap_stop_rtx(channel); 961 btstack_linked_list_iterator_remove(&it); 962 btstack_memory_l2cap_channel_free(channel); 963 } 964 break; 965 966 // Notify channel packet handler if they can send now 967 case DAEMON_EVENT_HCI_PACKET_SENT: 968 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 969 l2cap_run(); // try sending signaling packets first 970 l2cap_notify_channel_can_send(); 971 break; 972 973 // HCI Connection Timeouts 974 case L2CAP_EVENT_TIMEOUT_CHECK: 975 handle = little_endian_read_16(packet, 2); 976 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 977 if (hci_authentication_active_for_handle(handle)) break; 978 hci_con_used = 0; 979 btstack_linked_list_iterator_init(&it, &l2cap_channels); 980 while (btstack_linked_list_iterator_has_next(&it)){ 981 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 982 if (channel->handle != handle) continue; 983 hci_con_used = 1; 984 break; 985 } 986 if (hci_con_used) break; 987 if (!hci_can_send_command_packet_now()) break; 988 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 989 break; 990 991 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 992 handle = little_endian_read_16(packet, 3); 993 btstack_linked_list_iterator_init(&it, &l2cap_channels); 994 while (btstack_linked_list_iterator_has_next(&it)){ 995 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 996 if (channel->handle != handle) continue; 997 l2cap_handle_remote_supported_features_received(channel); 998 break; 999 } 1000 break; 1001 1002 case GAP_EVENT_SECURITY_LEVEL: 1003 handle = little_endian_read_16(packet, 2); 1004 log_info("l2cap - security level update"); 1005 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1006 while (btstack_linked_list_iterator_has_next(&it)){ 1007 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1008 if (channel->handle != handle) continue; 1009 1010 log_info("l2cap - state %u", channel->state); 1011 1012 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 1013 gap_security_level_t required_level = channel->required_security_level; 1014 1015 switch (channel->state){ 1016 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 1017 if (actual_level >= required_level){ 1018 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1019 l2cap_emit_connection_request(channel); 1020 } else { 1021 channel->reason = 0x0003; // security block 1022 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1023 } 1024 break; 1025 1026 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1027 if (actual_level >= required_level){ 1028 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1029 } else { 1030 // disconnnect, authentication not good enough 1031 hci_disconnect_security_block(handle); 1032 } 1033 break; 1034 1035 default: 1036 break; 1037 } 1038 } 1039 break; 1040 1041 default: 1042 break; 1043 } 1044 1045 l2cap_run(); 1046 } 1047 1048 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1049 channel->remote_sig_id = identifier; 1050 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1051 l2cap_run(); 1052 } 1053 1054 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1055 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1056 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1057 signaling_responses[signaling_responses_pending].handle = handle; 1058 signaling_responses[signaling_responses_pending].code = code; 1059 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1060 signaling_responses[signaling_responses_pending].data = data; 1061 signaling_responses_pending++; 1062 l2cap_run(); 1063 } 1064 } 1065 1066 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1067 1068 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1069 l2cap_service_t *service = l2cap_get_service(psm); 1070 if (!service) { 1071 // 0x0002 PSM not supported 1072 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1073 return; 1074 } 1075 1076 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1077 if (!hci_connection) { 1078 // 1079 log_error("no hci_connection for handle %u", handle); 1080 return; 1081 } 1082 1083 // alloc structure 1084 // log_info("l2cap_handle_connection_request register channel"); 1085 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1086 if (!channel){ 1087 // 0x0004 No resources available 1088 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1089 return; 1090 } 1091 // Init memory (make valgrind happy) 1092 memset(channel, 0, sizeof(l2cap_channel_t)); 1093 // fill in 1094 bd_addr_copy(channel->address, hci_connection->address); 1095 channel->psm = psm; 1096 channel->handle = handle; 1097 channel->packet_handler = service->packet_handler; 1098 channel->local_cid = l2cap_next_local_cid(); 1099 channel->remote_cid = source_cid; 1100 channel->local_mtu = service->mtu; 1101 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1102 channel->remote_sig_id = sig_id; 1103 channel->required_security_level = service->required_security_level; 1104 1105 // limit local mtu to max acl packet length - l2cap header 1106 if (channel->local_mtu > l2cap_max_mtu()) { 1107 channel->local_mtu = l2cap_max_mtu(); 1108 } 1109 1110 // set initial state 1111 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1112 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1113 1114 // add to connections list 1115 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1116 1117 // assert security requirements 1118 gap_request_security_level(handle, channel->required_security_level); 1119 } 1120 1121 void l2cap_accept_connection(uint16_t local_cid){ 1122 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1123 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1124 if (!channel) { 1125 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1126 return; 1127 } 1128 1129 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1130 1131 // process 1132 l2cap_run(); 1133 } 1134 1135 void l2cap_decline_connection(uint16_t local_cid, uint8_t reason){ 1136 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1137 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1138 if (!channel) { 1139 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1140 return; 1141 } 1142 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1143 channel->reason = reason; 1144 l2cap_run(); 1145 } 1146 1147 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1148 1149 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1150 1151 uint16_t flags = little_endian_read_16(command, 6); 1152 if (flags & 1) { 1153 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1154 } 1155 1156 // accept the other's configuration options 1157 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1158 uint16_t pos = 8; 1159 while (pos < end_pos){ 1160 uint8_t option_hint = command[pos] >> 7; 1161 uint8_t option_type = command[pos] & 0x7f; 1162 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1163 pos++; 1164 uint8_t length = command[pos++]; 1165 // MTU { type(8): 1, len(8):2, MTU(16) } 1166 if (option_type == 1 && length == 2){ 1167 channel->remote_mtu = little_endian_read_16(command, pos); 1168 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1169 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1170 } 1171 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1172 if (option_type == 2 && length == 2){ 1173 channel->flush_timeout = little_endian_read_16(command, pos); 1174 } 1175 // check for unknown options 1176 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1177 log_info("l2cap cid %u, unknown options", channel->local_cid); 1178 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1179 } 1180 pos += length; 1181 } 1182 } 1183 1184 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1185 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1186 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1187 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1188 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1189 if (channel->state == L2CAP_STATE_OPEN) return 0; 1190 return 1; 1191 } 1192 1193 1194 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1195 1196 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1197 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1198 uint16_t result = 0; 1199 1200 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1201 1202 // handle DISCONNECT REQUESTS seperately 1203 if (code == DISCONNECTION_REQUEST){ 1204 switch (channel->state){ 1205 case L2CAP_STATE_CONFIG: 1206 case L2CAP_STATE_OPEN: 1207 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1208 case L2CAP_STATE_WAIT_DISCONNECT: 1209 l2cap_handle_disconnect_request(channel, identifier); 1210 break; 1211 1212 default: 1213 // ignore in other states 1214 break; 1215 } 1216 return; 1217 } 1218 1219 // @STATEMACHINE(l2cap) 1220 switch (channel->state) { 1221 1222 case L2CAP_STATE_WAIT_CONNECT_RSP: 1223 switch (code){ 1224 case CONNECTION_RESPONSE: 1225 l2cap_stop_rtx(channel); 1226 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1227 switch (result) { 1228 case 0: 1229 // successful connection 1230 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1231 channel->state = L2CAP_STATE_CONFIG; 1232 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1233 break; 1234 case 1: 1235 // connection pending. get some coffee, but start the ERTX 1236 l2cap_start_ertx(channel); 1237 break; 1238 default: 1239 // channel closed 1240 channel->state = L2CAP_STATE_CLOSED; 1241 // map l2cap connection response result to BTstack status enumeration 1242 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1243 1244 // drop link key if security block 1245 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1246 hci_drop_link_key_for_bd_addr(channel->address); 1247 } 1248 1249 // discard channel 1250 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1251 btstack_memory_l2cap_channel_free(channel); 1252 break; 1253 } 1254 break; 1255 1256 default: 1257 //@TODO: implement other signaling packets 1258 break; 1259 } 1260 break; 1261 1262 case L2CAP_STATE_CONFIG: 1263 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1264 switch (code) { 1265 case CONFIGURE_REQUEST: 1266 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1267 l2cap_signaling_handle_configure_request(channel, command); 1268 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1269 // only done if continuation not set 1270 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1271 } 1272 break; 1273 case CONFIGURE_RESPONSE: 1274 l2cap_stop_rtx(channel); 1275 switch (result){ 1276 case 0: // success 1277 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1278 break; 1279 case 4: // pending 1280 l2cap_start_ertx(channel); 1281 break; 1282 default: 1283 // retry on negative result 1284 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1285 break; 1286 } 1287 break; 1288 default: 1289 break; 1290 } 1291 if (l2cap_channel_ready_for_open(channel)){ 1292 // for open: 1293 channel->state = L2CAP_STATE_OPEN; 1294 l2cap_emit_channel_opened(channel, 0); 1295 } 1296 break; 1297 1298 case L2CAP_STATE_WAIT_DISCONNECT: 1299 switch (code) { 1300 case DISCONNECTION_RESPONSE: 1301 l2cap_finialize_channel_close(channel); 1302 break; 1303 default: 1304 //@TODO: implement other signaling packets 1305 break; 1306 } 1307 break; 1308 1309 case L2CAP_STATE_CLOSED: 1310 // @TODO handle incoming requests 1311 break; 1312 1313 case L2CAP_STATE_OPEN: 1314 //@TODO: implement other signaling packets, e.g. re-configure 1315 break; 1316 default: 1317 break; 1318 } 1319 // log_info("new state %u", channel->state); 1320 } 1321 1322 1323 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1324 1325 // get code, signalind identifier and command len 1326 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1327 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1328 1329 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1330 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1331 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1332 return; 1333 } 1334 1335 // general commands without an assigned channel 1336 switch(code) { 1337 1338 case CONNECTION_REQUEST: { 1339 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1340 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1341 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1342 return; 1343 } 1344 1345 case ECHO_REQUEST: 1346 l2cap_register_signaling_response(handle, code, sig_id, 0); 1347 return; 1348 1349 case INFORMATION_REQUEST: { 1350 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1351 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1352 return; 1353 } 1354 1355 default: 1356 break; 1357 } 1358 1359 1360 // Get potential destination CID 1361 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1362 1363 // Find channel for this sig_id and connection handle 1364 btstack_linked_list_iterator_t it; 1365 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1366 while (btstack_linked_list_iterator_has_next(&it)){ 1367 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1368 if (channel->handle != handle) continue; 1369 if (code & 1) { 1370 // match odd commands (responses) by previous signaling identifier 1371 if (channel->local_sig_id == sig_id) { 1372 l2cap_signaling_handler_channel(channel, command); 1373 break; 1374 } 1375 } else { 1376 // match even commands (requests) by local channel id 1377 if (channel->local_cid == dest_cid) { 1378 l2cap_signaling_handler_channel(channel, command); 1379 break; 1380 } 1381 } 1382 } 1383 } 1384 1385 static void l2cap_acl_handler(uint8_t packet_type, uint8_t *packet, uint16_t size ){ 1386 1387 // Get Channel ID 1388 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1389 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1390 1391 switch (channel_id) { 1392 1393 case L2CAP_CID_SIGNALING: { 1394 1395 uint16_t command_offset = 8; 1396 while (command_offset < size) { 1397 1398 // handle signaling commands 1399 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1400 1401 // increment command_offset 1402 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1403 } 1404 break; 1405 } 1406 1407 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1408 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1409 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1410 } 1411 break; 1412 1413 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1414 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1415 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1416 } 1417 break; 1418 1419 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1420 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1421 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1422 } 1423 break; 1424 1425 case L2CAP_CID_SIGNALING_LE: { 1426 switch (packet[8]){ 1427 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1428 uint16_t result = little_endian_read_16(packet, 12); 1429 l2cap_emit_connection_parameter_update_response(handle, result); 1430 break; 1431 } 1432 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1433 uint8_t event[10]; 1434 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1435 event[1] = 8; 1436 memcpy(&event[2], &packet[12], 8); 1437 1438 hci_connection_t * connection = hci_connection_for_handle(handle); 1439 if (connection){ 1440 if (connection->role != HCI_ROLE_MASTER){ 1441 // reject command without notifying upper layer when not in master role 1442 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1443 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1444 break; 1445 } 1446 int update_parameter = 1; 1447 le_connection_parameter_range_t existing_range; 1448 gap_get_connection_parameter_range(existing_range); 1449 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1450 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1451 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1452 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1453 1454 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1455 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1456 1457 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1458 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1459 1460 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1461 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1462 1463 if (update_parameter){ 1464 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1465 connection->le_conn_interval_min = le_conn_interval_min; 1466 connection->le_conn_interval_max = le_conn_interval_max; 1467 connection->le_conn_latency = le_conn_latency; 1468 connection->le_supervision_timeout = le_supervision_timeout; 1469 } else { 1470 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1471 } 1472 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1473 } 1474 1475 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1476 if (!l2cap_event_packet_handler) break; 1477 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1478 break; 1479 } 1480 default: { 1481 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1482 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1483 break; 1484 } 1485 } 1486 break; 1487 } 1488 1489 default: { 1490 // Find channel for this channel_id and connection handle 1491 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1492 if (channel) { 1493 l2cap_dispatch_to_channel(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1494 } 1495 break; 1496 } 1497 } 1498 1499 l2cap_run(); 1500 } 1501 1502 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1503 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1504 channel->state = L2CAP_STATE_CLOSED; 1505 l2cap_emit_channel_closed(channel); 1506 // discard channel 1507 l2cap_stop_rtx(channel); 1508 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1509 btstack_memory_l2cap_channel_free(channel); 1510 } 1511 1512 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1513 btstack_linked_list_iterator_t it; 1514 btstack_linked_list_iterator_init(&it, services); 1515 while (btstack_linked_list_iterator_has_next(&it)){ 1516 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1517 if ( service->psm == psm){ 1518 return service; 1519 }; 1520 } 1521 return NULL; 1522 } 1523 1524 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1525 return l2cap_get_service_internal(&l2cap_services, psm); 1526 } 1527 1528 1529 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1530 1531 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1532 1533 // check for alread registered psm 1534 // TODO: emit error event 1535 l2cap_service_t *service = l2cap_get_service(psm); 1536 if (service) { 1537 log_error("l2cap_register_service: PSM %u already registered", psm); 1538 return L2CAP_SERVICE_ALREADY_REGISTERED; 1539 } 1540 1541 // alloc structure 1542 // TODO: emit error event 1543 service = btstack_memory_l2cap_service_get(); 1544 if (!service) { 1545 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1546 return BTSTACK_MEMORY_ALLOC_FAILED; 1547 } 1548 1549 // fill in 1550 service->psm = psm; 1551 service->mtu = mtu; 1552 service->packet_handler = service_packet_handler; 1553 service->required_security_level = security_level; 1554 1555 // add to services list 1556 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1557 1558 // enable page scan 1559 hci_connectable_control(1); 1560 1561 return 0; 1562 } 1563 1564 void l2cap_unregister_service(uint16_t psm){ 1565 1566 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1567 1568 l2cap_service_t *service = l2cap_get_service(psm); 1569 if (!service) return; 1570 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1571 btstack_memory_l2cap_service_free(service); 1572 1573 // disable page scan when no services registered 1574 if (!btstack_linked_list_empty(&l2cap_services)) return; 1575 hci_connectable_control(0); 1576 } 1577 1578 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1579 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1580 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 1581 if (index < 0) return; 1582 fixed_channels[index].callback = the_packet_handler; 1583 } 1584 1585 #ifdef ENABLE_BLE 1586 1587 1588 #if 0 1589 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1590 return l2cap_get_service_internal(&l2cap_le_services, psm); 1591 } 1592 /** 1593 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1594 * @param 1595 */ 1596 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1597 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1598 1599 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1600 1601 // check for alread registered psm 1602 // TODO: emit error event 1603 l2cap_service_t *service = l2cap_le_get_service(psm); 1604 if (service) { 1605 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1606 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1607 return; 1608 } 1609 1610 // alloc structure 1611 // TODO: emit error event 1612 service = btstack_memory_l2cap_service_get(); 1613 if (!service) { 1614 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1615 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1616 return; 1617 } 1618 1619 // fill in 1620 service->psm = psm; 1621 service->mtu = mtu; 1622 service->mps = mps; 1623 service->packet_handler = packet_handler; 1624 service->required_security_level = security_level; 1625 1626 // add to services list 1627 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1628 1629 // done 1630 l2cap_emit_service_registered(connection, 0, psm); 1631 } 1632 1633 void l2cap_le_unregister_service(uint16_t psm) { 1634 1635 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1636 1637 l2cap_service_t *service = l2cap_le_get_service(psm); 1638 if (!service) return; 1639 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1640 btstack_memory_l2cap_service_free(service); 1641 } 1642 #endif 1643 #endif 1644