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_event.h" 51 #include "btstack_memory.h" 52 53 #include <stdarg.h> 54 #include <string.h> 55 56 #include <stdio.h> 57 58 // nr of buffered acl packets in outgoing queue to get max performance 59 #define NR_BUFFERED_ACL_PACKETS 3 60 61 // used to cache l2cap rejects, echo, and informational requests 62 #define NR_PENDING_SIGNALING_RESPONSES 3 63 64 // offsets for L2CAP SIGNALING COMMANDS 65 #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 66 #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 67 #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 68 #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 69 70 // internal table 71 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL 0 72 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL 1 73 #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL 2 74 #define L2CAP_FIXED_CHANNEL_TABLE_SIZE (L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL+1) 75 76 // prototypes 77 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 78 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 79 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 80 static void l2cap_emit_can_send_now(btstack_packet_handler_t packet_handler, uint16_t channel); 81 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 82 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 83 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 84 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 85 static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ); 86 static void l2cap_notify_channel_can_send(void); 87 88 typedef struct l2cap_fixed_channel { 89 btstack_packet_handler_t callback; 90 uint8_t waiting_for_can_send_now; 91 } l2cap_fixed_channel_t; 92 93 static btstack_linked_list_t l2cap_channels; 94 static btstack_linked_list_t l2cap_services; 95 static btstack_linked_list_t l2cap_le_channels; 96 static btstack_linked_list_t l2cap_le_services; 97 98 // used to cache l2cap rejects, echo, and informational requests 99 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 100 static int signaling_responses_pending; 101 102 static uint8_t require_security_level2_for_outgoing_sdp; 103 104 static btstack_packet_callback_registration_t hci_event_callback_registration; 105 106 static btstack_packet_handler_t l2cap_event_packet_handler; 107 static l2cap_fixed_channel_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_SIZE]; 108 109 static uint16_t l2cap_fixed_channel_table_channel_id_for_index(int index){ 110 switch (index){ 111 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL: 112 return L2CAP_CID_ATTRIBUTE_PROTOCOL; 113 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL: 114 return L2CAP_CID_SECURITY_MANAGER_PROTOCOL; 115 case L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL: 116 return L2CAP_CID_CONNECTIONLESS_CHANNEL; 117 default: 118 return 0; 119 } 120 } 121 static int l2cap_fixed_channel_table_index_for_channel_id(uint16_t channel_id){ 122 switch (channel_id){ 123 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 124 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL; 125 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 126 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL; 127 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 128 return L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL; 129 default: 130 return -1; 131 } 132 } 133 134 static int l2cap_fixed_channel_table_index_is_le(int index){ 135 if (index == L2CAP_CID_CONNECTIONLESS_CHANNEL) return 0; 136 return 1; 137 } 138 139 void l2cap_init(void){ 140 signaling_responses_pending = 0; 141 142 l2cap_channels = NULL; 143 l2cap_services = NULL; 144 l2cap_le_services = NULL; 145 l2cap_le_channels = NULL; 146 147 l2cap_event_packet_handler = NULL; 148 memset(fixed_channels, 0, sizeof(fixed_channels)); 149 150 require_security_level2_for_outgoing_sdp = 0; 151 152 // 153 // register callback with HCI 154 // 155 hci_event_callback_registration.callback = &l2cap_hci_event_handler; 156 hci_add_event_handler(&hci_event_callback_registration); 157 158 hci_register_acl_packet_handler(&l2cap_acl_handler); 159 160 gap_connectable_control(0); // no services yet 161 } 162 163 void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 164 l2cap_event_packet_handler = handler; 165 } 166 167 static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 168 (* (channel->packet_handler))(type, channel->local_cid, data, size); 169 } 170 171 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 172 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", 173 status, bd_addr_to_str(channel->address), channel->con_handle, channel->psm, 174 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 175 uint8_t event[23]; 176 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 177 event[1] = sizeof(event) - 2; 178 event[2] = status; 179 reverse_bd_addr(channel->address, &event[3]); 180 little_endian_store_16(event, 9, channel->con_handle); 181 little_endian_store_16(event, 11, channel->psm); 182 little_endian_store_16(event, 13, channel->local_cid); 183 little_endian_store_16(event, 15, channel->remote_cid); 184 little_endian_store_16(event, 17, channel->local_mtu); 185 little_endian_store_16(event, 19, channel->remote_mtu); 186 little_endian_store_16(event, 21, channel->flush_timeout); 187 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 189 } 190 191 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 192 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 193 uint8_t event[4]; 194 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 195 event[1] = sizeof(event) - 2; 196 little_endian_store_16(event, 2, channel->local_cid); 197 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 198 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 199 } 200 201 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 202 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 203 bd_addr_to_str(channel->address), channel->con_handle, channel->psm, channel->local_cid, channel->remote_cid); 204 uint8_t event[16]; 205 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 206 event[1] = sizeof(event) - 2; 207 reverse_bd_addr(channel->address, &event[2]); 208 little_endian_store_16(event, 8, channel->con_handle); 209 little_endian_store_16(event, 10, channel->psm); 210 little_endian_store_16(event, 12, channel->local_cid); 211 little_endian_store_16(event, 14, channel->remote_cid); 212 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 213 l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 214 } 215 216 static void l2cap_emit_can_send_now(btstack_packet_handler_t packet_handler, uint16_t channel) { 217 log_info("L2CAP_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel); 218 uint8_t event[4]; 219 event[0] = L2CAP_EVENT_CAN_SEND_NOW; 220 event[1] = sizeof(event) - 2; 221 little_endian_store_16(event, 2, channel); 222 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 223 packet_handler(HCI_EVENT_PACKET, channel, event, sizeof(event)); 224 } 225 226 static void l2cap_emit_connection_parameter_update_response(hci_con_handle_t con_handle, uint16_t result){ 227 uint8_t event[6]; 228 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 229 event[1] = 4; 230 little_endian_store_16(event, 2, con_handle); 231 little_endian_store_16(event, 4, result); 232 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 233 if (!l2cap_event_packet_handler) return; 234 (*l2cap_event_packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 235 } 236 237 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 238 btstack_linked_list_iterator_t it; 239 btstack_linked_list_iterator_init(&it, &l2cap_channels); 240 while (btstack_linked_list_iterator_has_next(&it)){ 241 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 242 if ( channel->local_cid == local_cid) { 243 return channel; 244 } 245 } 246 return NULL; 247 } 248 249 /// 250 251 void l2cap_request_can_send_now_event(uint16_t local_cid){ 252 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 253 if (!channel) return; 254 channel->waiting_for_can_send_now = 1; 255 l2cap_notify_channel_can_send(); 256 } 257 258 void l2cap_request_can_send_fix_channel_now_event(hci_con_handle_t con_handle, uint16_t channel_id){ 259 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 260 if (index < 0) return; 261 fixed_channels[index].waiting_for_can_send_now = 1; 262 l2cap_notify_channel_can_send(); 263 } 264 265 /// 266 267 int l2cap_can_send_packet_now(uint16_t local_cid){ 268 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 269 if (!channel) return 0; 270 return hci_can_send_acl_packet_now(channel->con_handle); 271 } 272 273 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 274 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 275 if (!channel) return 0; 276 return hci_can_send_prepared_acl_packet_now(channel->con_handle); 277 } 278 279 int l2cap_can_send_fixed_channel_packet_now(hci_con_handle_t con_handle, uint16_t channel_id){ 280 return hci_can_send_acl_packet_now(con_handle); 281 } 282 283 /// 284 285 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 286 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 287 if (channel) { 288 return channel->remote_mtu; 289 } 290 return 0; 291 } 292 293 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 294 btstack_linked_list_iterator_t it; 295 btstack_linked_list_iterator_init(&it, &l2cap_channels); 296 while (btstack_linked_list_iterator_has_next(&it)){ 297 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 298 if ( &channel->rtx == ts) { 299 return channel; 300 } 301 } 302 return NULL; 303 } 304 305 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 306 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 307 if (!channel) return; 308 309 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 310 311 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 312 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 313 // notify client 314 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 315 316 // discard channel 317 // no need to stop timer here, it is removed from list during timer callback 318 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 319 btstack_memory_l2cap_channel_free(channel); 320 } 321 322 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 323 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 324 btstack_run_loop_remove_timer(&channel->rtx); 325 } 326 327 static void l2cap_start_rtx(l2cap_channel_t * channel){ 328 l2cap_stop_rtx(channel); 329 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 330 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 331 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 332 btstack_run_loop_add_timer(&channel->rtx); 333 } 334 335 static void l2cap_start_ertx(l2cap_channel_t * channel){ 336 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 337 l2cap_stop_rtx(channel); 338 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 339 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 340 btstack_run_loop_add_timer(&channel->rtx); 341 } 342 343 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 344 require_security_level2_for_outgoing_sdp = 1; 345 } 346 347 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 348 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 349 } 350 351 static int l2cap_send_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_classic(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 } 368 369 #ifdef ENABLE_BLE 370 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 371 372 if (!hci_can_send_acl_packet_now(handle)){ 373 log_info("l2cap_send_signaling_packet, cannot send"); 374 return BTSTACK_ACL_BUFFERS_FULL; 375 } 376 377 // log_info("l2cap_send_signaling_packet type %u", cmd); 378 hci_reserve_packet_buffer(); 379 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 380 va_list argptr; 381 va_start(argptr, identifier); 382 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 383 va_end(argptr); 384 // log_info("l2cap_send_signaling_packet con %u!", handle); 385 return hci_send_acl_packet_buffer(len); 386 } 387 #endif 388 389 uint8_t *l2cap_get_outgoing_buffer(void){ 390 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 391 } 392 393 int l2cap_reserve_packet_buffer(void){ 394 return hci_reserve_packet_buffer(); 395 } 396 397 void l2cap_release_packet_buffer(void){ 398 hci_release_packet_buffer(); 399 } 400 401 402 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 403 404 if (!hci_is_packet_buffer_reserved()){ 405 log_error("l2cap_send_prepared called without reserving packet first"); 406 return BTSTACK_ACL_BUFFERS_FULL; 407 } 408 409 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 410 if (!channel) { 411 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 412 return -1; // TODO: define error 413 } 414 415 if (!hci_can_send_prepared_acl_packet_now(channel->con_handle)){ 416 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 417 return BTSTACK_ACL_BUFFERS_FULL; 418 } 419 420 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->con_handle); 421 422 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 423 424 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 425 426 // 0 - Connection handle : PB=pb : BC=00 427 little_endian_store_16(acl_buffer, 0, channel->con_handle | (pb << 12) | (0 << 14)); 428 // 2 - ACL length 429 little_endian_store_16(acl_buffer, 2, len + 4); 430 // 4 - L2CAP packet length 431 little_endian_store_16(acl_buffer, 4, len + 0); 432 // 6 - L2CAP channel DEST 433 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 434 // send 435 int err = hci_send_acl_packet_buffer(len+8); 436 437 return err; 438 } 439 440 int l2cap_send_prepared_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint16_t len){ 441 442 if (!hci_is_packet_buffer_reserved()){ 443 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 444 return BTSTACK_ACL_BUFFERS_FULL; 445 } 446 447 if (!hci_can_send_prepared_acl_packet_now(con_handle)){ 448 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", con_handle, cid); 449 return BTSTACK_ACL_BUFFERS_FULL; 450 } 451 452 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", con_handle, cid); 453 454 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 455 456 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 457 458 // 0 - Connection handle : PB=pb : BC=00 459 little_endian_store_16(acl_buffer, 0, con_handle | (pb << 12) | (0 << 14)); 460 // 2 - ACL length 461 little_endian_store_16(acl_buffer, 2, len + 4); 462 // 4 - L2CAP packet length 463 little_endian_store_16(acl_buffer, 4, len + 0); 464 // 6 - L2CAP channel DEST 465 little_endian_store_16(acl_buffer, 6, cid); 466 // send 467 int err = hci_send_acl_packet_buffer(len+8); 468 469 return err; 470 } 471 472 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 473 474 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 475 if (!channel) { 476 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 477 return -1; // TODO: define error 478 } 479 480 if (len > channel->remote_mtu){ 481 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 482 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 483 } 484 485 if (!hci_can_send_acl_packet_now(channel->con_handle)){ 486 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 487 return BTSTACK_ACL_BUFFERS_FULL; 488 } 489 490 hci_reserve_packet_buffer(); 491 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 492 493 memcpy(&acl_buffer[8], data, len); 494 495 return l2cap_send_prepared(local_cid, len); 496 } 497 498 int l2cap_send_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint8_t *data, uint16_t len){ 499 500 if (!hci_can_send_acl_packet_now(con_handle)){ 501 log_info("l2cap_send cid 0x%02x, cannot send", cid); 502 return BTSTACK_ACL_BUFFERS_FULL; 503 } 504 505 hci_reserve_packet_buffer(); 506 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 507 508 memcpy(&acl_buffer[8], data, len); 509 510 return l2cap_send_prepared_connectionless(con_handle, cid, len); 511 } 512 513 int l2cap_send_echo_request(hci_con_handle_t con_handle, uint8_t *data, uint16_t len){ 514 return l2cap_send_signaling_packet(con_handle, ECHO_REQUEST, 0x77, len, data); 515 } 516 517 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 518 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 519 } 520 521 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 522 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 523 } 524 525 526 527 // MARK: L2CAP_RUN 528 // process outstanding signaling tasks 529 static void l2cap_run(void){ 530 531 // log_info("l2cap_run: entered"); 532 533 // check pending signaling responses 534 while (signaling_responses_pending){ 535 536 hci_con_handle_t handle = signaling_responses[0].handle; 537 538 if (!hci_can_send_acl_packet_now(handle)) break; 539 540 uint8_t sig_id = signaling_responses[0].sig_id; 541 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 542 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 543 uint8_t response_code = signaling_responses[0].code; 544 545 // remove first item before sending (to avoid sending response mutliple times) 546 signaling_responses_pending--; 547 int i; 548 for (i=0; i < signaling_responses_pending; i++){ 549 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 550 } 551 552 switch (response_code){ 553 case CONNECTION_REQUEST: 554 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 555 // also disconnect if result is 0x0003 - security blocked 556 if (result == 0x0003){ 557 hci_disconnect_security_block(handle); 558 } 559 break; 560 case ECHO_REQUEST: 561 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 562 break; 563 case INFORMATION_REQUEST: 564 switch (infoType){ 565 case 1: { // Connectionless MTU 566 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 567 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 568 break; 569 } 570 case 2: { // Extended Features Supported 571 // extended features request supported, features: fixed channels, unicast connectionless data reception 572 uint32_t features = 0x280; 573 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 574 break; 575 } 576 case 3: { // Fixed Channels Supported 577 uint8_t map[8]; 578 memset(map, 0, 8); 579 map[0] = 0x06; // L2CAP Signaling Channel (0x02) + Connectionless reception (0x04) 580 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 581 break; 582 } 583 default: 584 // all other types are not supported 585 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 586 break; 587 } 588 break; 589 case COMMAND_REJECT: 590 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 591 #ifdef ENABLE_BLE 592 case COMMAND_REJECT_LE: 593 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 594 break; 595 #endif 596 default: 597 // should not happen 598 break; 599 } 600 } 601 602 uint8_t config_options[4]; 603 btstack_linked_list_iterator_t it; 604 btstack_linked_list_iterator_init(&it, &l2cap_channels); 605 while (btstack_linked_list_iterator_has_next(&it)){ 606 607 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 608 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 609 switch (channel->state){ 610 611 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 612 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 613 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 614 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 615 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 616 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 617 } 618 break; 619 620 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 621 if (!hci_can_send_command_packet_now()) break; 622 // send connection request - set state first 623 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 624 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 625 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 626 break; 627 628 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 629 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 630 channel->state = L2CAP_STATE_INVALID; 631 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 632 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 633 l2cap_stop_rtx(channel); 634 btstack_linked_list_iterator_remove(&it); 635 btstack_memory_l2cap_channel_free(channel); 636 break; 637 638 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 639 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 640 channel->state = L2CAP_STATE_CONFIG; 641 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 642 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 643 break; 644 645 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 646 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 647 // success, start l2cap handshake 648 channel->local_sig_id = l2cap_next_sig_id(); 649 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 650 l2cap_send_signaling_packet( channel->con_handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 651 l2cap_start_rtx(channel); 652 break; 653 654 case L2CAP_STATE_CONFIG: 655 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 656 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 657 uint16_t flags = 0; 658 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 659 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 660 flags = 1; 661 } else { 662 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 663 } 664 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 665 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 666 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 667 config_options[0] = 1; // MTU 668 config_options[1] = 2; // len param 669 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 670 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 671 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 672 } else { 673 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 674 } 675 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 676 } 677 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 678 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 679 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 680 channel->local_sig_id = l2cap_next_sig_id(); 681 config_options[0] = 1; // MTU 682 config_options[1] = 2; // len param 683 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 684 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 685 l2cap_start_rtx(channel); 686 } 687 if (l2cap_channel_ready_for_open(channel)){ 688 channel->state = L2CAP_STATE_OPEN; 689 l2cap_emit_channel_opened(channel, 0); // success 690 } 691 break; 692 693 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 694 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 695 channel->state = L2CAP_STATE_INVALID; 696 l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 697 // 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 :) 698 l2cap_finialize_channel_close(channel); // -- remove from list 699 break; 700 701 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 702 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 703 channel->local_sig_id = l2cap_next_sig_id(); 704 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 705 l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 706 break; 707 default: 708 break; 709 } 710 } 711 712 #ifdef ENABLE_BLE 713 // send l2cap con paramter update if necessary 714 hci_connections_get_iterator(&it); 715 while(btstack_linked_list_iterator_has_next(&it)){ 716 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 717 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 718 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 719 switch (connection->le_con_parameter_update_state){ 720 case CON_PARAMETER_UPDATE_SEND_REQUEST: 721 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 722 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 723 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 724 break; 725 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 726 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 727 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 728 break; 729 case CON_PARAMETER_UPDATE_DENY: 730 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 731 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 732 break; 733 default: 734 break; 735 } 736 } 737 #endif 738 739 // log_info("l2cap_run: exit"); 740 } 741 742 uint16_t l2cap_max_mtu(void){ 743 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 744 } 745 746 uint16_t l2cap_max_le_mtu(void){ 747 return l2cap_max_mtu(); 748 } 749 750 static void l2cap_handle_connection_complete(hci_con_handle_t con_handle, l2cap_channel_t * channel){ 751 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 752 log_info("l2cap_handle_connection_complete expected state"); 753 // success, start l2cap handshake 754 channel->con_handle = con_handle; 755 // check remote SSP feature first 756 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 757 } 758 } 759 760 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 761 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 762 763 // we have been waiting for remote supported features, if both support SSP, 764 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)); 765 if (gap_ssp_supported_on_both_sides(channel->con_handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 766 // request security level 2 767 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 768 gap_request_security_level(channel->con_handle, LEVEL_2); 769 return; 770 } 771 // fine, go ahead 772 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 773 } 774 775 /** 776 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 777 * @param packet_handler 778 * @param address 779 * @param psm 780 * @param mtu 781 * @param local_cid 782 */ 783 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){ 784 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 785 786 // alloc structure 787 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 788 if (!channel) { 789 return BTSTACK_MEMORY_ALLOC_FAILED; 790 } 791 792 // Init memory (make valgrind happy) 793 memset(channel, 0, sizeof(l2cap_channel_t)); 794 // limit local mtu to max acl packet length - l2cap header 795 if (mtu > l2cap_max_mtu()) { 796 mtu = l2cap_max_mtu(); 797 } 798 799 // fill in 800 bd_addr_copy(channel->address, address); 801 channel->psm = psm; 802 channel->con_handle = 0; 803 channel->packet_handler = channel_packet_handler; 804 channel->remote_mtu = L2CAP_MINIMAL_MTU; 805 channel->local_mtu = mtu; 806 channel->local_cid = l2cap_next_local_cid(); 807 808 // set initial state 809 channel->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 810 channel->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 811 channel->remote_sig_id = L2CAP_SIG_ID_INVALID; 812 channel->local_sig_id = L2CAP_SIG_ID_INVALID; 813 channel->required_security_level = LEVEL_0; 814 815 // add to connections list 816 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 817 818 // store local_cid 819 if (out_local_cid){ 820 *out_local_cid = channel->local_cid; 821 } 822 823 // check if hci connection is already usable 824 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 825 if (conn){ 826 log_info("l2cap_create_channel, hci connection already exists"); 827 l2cap_handle_connection_complete(conn->con_handle, channel); 828 // check if remote supported fearures are already received 829 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 830 l2cap_handle_remote_supported_features_received(channel); 831 } 832 } 833 834 l2cap_run(); 835 836 return 0; 837 } 838 839 void 840 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 841 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 842 // find channel for local_cid 843 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 844 if (channel) { 845 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 846 } 847 // process 848 l2cap_run(); 849 } 850 851 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 852 btstack_linked_list_iterator_t it; 853 btstack_linked_list_iterator_init(&it, &l2cap_channels); 854 while (btstack_linked_list_iterator_has_next(&it)){ 855 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 856 if ( bd_addr_cmp( channel->address, address) != 0) continue; 857 // channel for this address found 858 switch (channel->state){ 859 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 860 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 861 // failure, forward error code 862 l2cap_emit_channel_opened(channel, status); 863 // discard channel 864 l2cap_stop_rtx(channel); 865 btstack_linked_list_iterator_remove(&it); 866 btstack_memory_l2cap_channel_free(channel); 867 break; 868 default: 869 break; 870 } 871 } 872 } 873 874 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 875 btstack_linked_list_iterator_t it; 876 btstack_linked_list_iterator_init(&it, &l2cap_channels); 877 while (btstack_linked_list_iterator_has_next(&it)){ 878 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 879 if ( ! bd_addr_cmp( channel->address, address) ){ 880 l2cap_handle_connection_complete(handle, channel); 881 } 882 } 883 // process 884 l2cap_run(); 885 } 886 887 static void l2cap_notify_channel_can_send(void){ 888 btstack_linked_list_iterator_t it; 889 btstack_linked_list_iterator_init(&it, &l2cap_channels); 890 while (btstack_linked_list_iterator_has_next(&it)){ 891 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 892 if (!channel->waiting_for_can_send_now) continue; 893 if (!hci_can_send_acl_packet_now(channel->con_handle)) continue; 894 channel->waiting_for_can_send_now = 0; 895 l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 896 } 897 898 int i; 899 for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 900 if (!fixed_channels[i].callback) continue; 901 if (!fixed_channels[i].waiting_for_can_send_now) continue; 902 int can_send; 903 if (l2cap_fixed_channel_table_index_is_le(i)){ 904 can_send = hci_can_send_acl_le_packet_now(); 905 } else { 906 can_send = hci_can_send_acl_classic_packet_now(); 907 } 908 if (!can_send) continue; 909 fixed_channels[i].waiting_for_can_send_now = 0; 910 l2cap_emit_can_send_now(fixed_channels[i].callback, l2cap_fixed_channel_table_channel_id_for_index(i)); 911 } 912 } 913 914 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 915 916 bd_addr_t address; 917 hci_con_handle_t handle; 918 btstack_linked_list_iterator_t it; 919 int hci_con_used; 920 921 switch(hci_event_packet_get_type(packet)){ 922 923 // handle connection complete events 924 case HCI_EVENT_CONNECTION_COMPLETE: 925 reverse_bd_addr(&packet[5], address); 926 if (packet[2] == 0){ 927 handle = little_endian_read_16(packet, 3); 928 l2cap_handle_connection_success_for_addr(address, handle); 929 } else { 930 l2cap_handle_connection_failed_for_addr(address, packet[2]); 931 } 932 break; 933 934 // handle successful create connection cancel command 935 case HCI_EVENT_COMMAND_COMPLETE: 936 if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_create_connection_cancel)) { 937 if (packet[5] == 0){ 938 reverse_bd_addr(&packet[6], address); 939 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 940 l2cap_handle_connection_failed_for_addr(address, 0x16); 941 } 942 } 943 l2cap_run(); // try sending signaling packets first 944 break; 945 946 case HCI_EVENT_COMMAND_STATUS: 947 l2cap_run(); // try sending signaling packets first 948 break; 949 950 // handle disconnection complete events 951 case HCI_EVENT_DISCONNECTION_COMPLETE: 952 // send l2cap disconnect events for all channels on this handle and free them 953 handle = little_endian_read_16(packet, 3); 954 btstack_linked_list_iterator_init(&it, &l2cap_channels); 955 while (btstack_linked_list_iterator_has_next(&it)){ 956 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 957 if (channel->con_handle != handle) continue; 958 l2cap_emit_channel_closed(channel); 959 l2cap_stop_rtx(channel); 960 btstack_linked_list_iterator_remove(&it); 961 btstack_memory_l2cap_channel_free(channel); 962 } 963 break; 964 965 // Notify channel packet handler if they can send now 966 case HCI_EVENT_TRANSPORT_PACKET_SENT: 967 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 968 l2cap_run(); // try sending signaling packets first 969 l2cap_notify_channel_can_send(); 970 break; 971 972 // HCI Connection Timeouts 973 case L2CAP_EVENT_TIMEOUT_CHECK: 974 handle = little_endian_read_16(packet, 2); 975 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 976 if (hci_authentication_active_for_handle(handle)) break; 977 hci_con_used = 0; 978 btstack_linked_list_iterator_init(&it, &l2cap_channels); 979 while (btstack_linked_list_iterator_has_next(&it)){ 980 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 981 if (channel->con_handle != handle) continue; 982 hci_con_used = 1; 983 break; 984 } 985 if (hci_con_used) break; 986 if (!hci_can_send_command_packet_now()) break; 987 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 988 break; 989 990 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 991 handle = little_endian_read_16(packet, 3); 992 btstack_linked_list_iterator_init(&it, &l2cap_channels); 993 while (btstack_linked_list_iterator_has_next(&it)){ 994 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 995 if (channel->con_handle != handle) continue; 996 l2cap_handle_remote_supported_features_received(channel); 997 break; 998 } 999 break; 1000 1001 case GAP_EVENT_SECURITY_LEVEL: 1002 handle = little_endian_read_16(packet, 2); 1003 log_info("l2cap - security level update"); 1004 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1005 while (btstack_linked_list_iterator_has_next(&it)){ 1006 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1007 if (channel->con_handle != handle) continue; 1008 1009 log_info("l2cap - state %u", channel->state); 1010 1011 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 1012 gap_security_level_t required_level = channel->required_security_level; 1013 1014 switch (channel->state){ 1015 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 1016 if (actual_level >= required_level){ 1017 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1018 l2cap_emit_connection_request(channel); 1019 } else { 1020 channel->reason = 0x0003; // security block 1021 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1022 } 1023 break; 1024 1025 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1026 if (actual_level >= required_level){ 1027 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1028 } else { 1029 // disconnnect, authentication not good enough 1030 hci_disconnect_security_block(handle); 1031 } 1032 break; 1033 1034 default: 1035 break; 1036 } 1037 } 1038 break; 1039 1040 default: 1041 break; 1042 } 1043 1044 l2cap_run(); 1045 } 1046 1047 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1048 channel->remote_sig_id = identifier; 1049 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1050 l2cap_run(); 1051 } 1052 1053 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1054 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1055 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1056 signaling_responses[signaling_responses_pending].handle = handle; 1057 signaling_responses[signaling_responses_pending].code = code; 1058 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1059 signaling_responses[signaling_responses_pending].data = data; 1060 signaling_responses_pending++; 1061 l2cap_run(); 1062 } 1063 } 1064 1065 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1066 1067 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1068 l2cap_service_t *service = l2cap_get_service(psm); 1069 if (!service) { 1070 // 0x0002 PSM not supported 1071 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1072 return; 1073 } 1074 1075 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1076 if (!hci_connection) { 1077 // 1078 log_error("no hci_connection for handle %u", handle); 1079 return; 1080 } 1081 1082 // alloc structure 1083 // log_info("l2cap_handle_connection_request register channel"); 1084 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1085 if (!channel){ 1086 // 0x0004 No resources available 1087 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1088 return; 1089 } 1090 // Init memory (make valgrind happy) 1091 memset(channel, 0, sizeof(l2cap_channel_t)); 1092 // fill in 1093 bd_addr_copy(channel->address, hci_connection->address); 1094 channel->psm = psm; 1095 channel->con_handle = handle; 1096 channel->packet_handler = service->packet_handler; 1097 channel->local_cid = l2cap_next_local_cid(); 1098 channel->remote_cid = source_cid; 1099 channel->local_mtu = service->mtu; 1100 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1101 channel->remote_sig_id = sig_id; 1102 channel->required_security_level = service->required_security_level; 1103 1104 // limit local mtu to max acl packet length - l2cap header 1105 if (channel->local_mtu > l2cap_max_mtu()) { 1106 channel->local_mtu = l2cap_max_mtu(); 1107 } 1108 1109 // set initial state 1110 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1111 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1112 1113 // add to connections list 1114 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1115 1116 // assert security requirements 1117 gap_request_security_level(handle, channel->required_security_level); 1118 } 1119 1120 void l2cap_accept_connection(uint16_t local_cid){ 1121 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1122 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1123 if (!channel) { 1124 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1125 return; 1126 } 1127 1128 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1129 1130 // process 1131 l2cap_run(); 1132 } 1133 1134 void l2cap_decline_connection(uint16_t local_cid){ 1135 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x", local_cid); 1136 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1137 if (!channel) { 1138 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1139 return; 1140 } 1141 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1142 channel->reason = 0x04; // no resources available 1143 l2cap_run(); 1144 } 1145 1146 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1147 1148 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1149 1150 uint16_t flags = little_endian_read_16(command, 6); 1151 if (flags & 1) { 1152 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1153 } 1154 1155 // accept the other's configuration options 1156 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1157 uint16_t pos = 8; 1158 while (pos < end_pos){ 1159 uint8_t option_hint = command[pos] >> 7; 1160 uint8_t option_type = command[pos] & 0x7f; 1161 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1162 pos++; 1163 uint8_t length = command[pos++]; 1164 // MTU { type(8): 1, len(8):2, MTU(16) } 1165 if (option_type == 1 && length == 2){ 1166 channel->remote_mtu = little_endian_read_16(command, pos); 1167 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1168 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1169 } 1170 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1171 if (option_type == 2 && length == 2){ 1172 channel->flush_timeout = little_endian_read_16(command, pos); 1173 } 1174 // check for unknown options 1175 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1176 log_info("l2cap cid %u, unknown options", channel->local_cid); 1177 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1178 } 1179 pos += length; 1180 } 1181 } 1182 1183 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1184 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1185 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1186 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1187 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1188 if (channel->state == L2CAP_STATE_OPEN) return 0; 1189 return 1; 1190 } 1191 1192 1193 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1194 1195 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1196 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1197 uint16_t result = 0; 1198 1199 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1200 1201 // handle DISCONNECT REQUESTS seperately 1202 if (code == DISCONNECTION_REQUEST){ 1203 switch (channel->state){ 1204 case L2CAP_STATE_CONFIG: 1205 case L2CAP_STATE_OPEN: 1206 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1207 case L2CAP_STATE_WAIT_DISCONNECT: 1208 l2cap_handle_disconnect_request(channel, identifier); 1209 break; 1210 1211 default: 1212 // ignore in other states 1213 break; 1214 } 1215 return; 1216 } 1217 1218 // @STATEMACHINE(l2cap) 1219 switch (channel->state) { 1220 1221 case L2CAP_STATE_WAIT_CONNECT_RSP: 1222 switch (code){ 1223 case CONNECTION_RESPONSE: 1224 l2cap_stop_rtx(channel); 1225 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1226 switch (result) { 1227 case 0: 1228 // successful connection 1229 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1230 channel->state = L2CAP_STATE_CONFIG; 1231 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1232 break; 1233 case 1: 1234 // connection pending. get some coffee, but start the ERTX 1235 l2cap_start_ertx(channel); 1236 break; 1237 default: 1238 // channel closed 1239 channel->state = L2CAP_STATE_CLOSED; 1240 // map l2cap connection response result to BTstack status enumeration 1241 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1242 1243 // drop link key if security block 1244 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1245 gap_drop_link_key_for_bd_addr(channel->address); 1246 } 1247 1248 // discard channel 1249 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1250 btstack_memory_l2cap_channel_free(channel); 1251 break; 1252 } 1253 break; 1254 1255 default: 1256 //@TODO: implement other signaling packets 1257 break; 1258 } 1259 break; 1260 1261 case L2CAP_STATE_CONFIG: 1262 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1263 switch (code) { 1264 case CONFIGURE_REQUEST: 1265 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1266 l2cap_signaling_handle_configure_request(channel, command); 1267 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1268 // only done if continuation not set 1269 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1270 } 1271 break; 1272 case CONFIGURE_RESPONSE: 1273 l2cap_stop_rtx(channel); 1274 switch (result){ 1275 case 0: // success 1276 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1277 break; 1278 case 4: // pending 1279 l2cap_start_ertx(channel); 1280 break; 1281 default: 1282 // retry on negative result 1283 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1284 break; 1285 } 1286 break; 1287 default: 1288 break; 1289 } 1290 if (l2cap_channel_ready_for_open(channel)){ 1291 // for open: 1292 channel->state = L2CAP_STATE_OPEN; 1293 l2cap_emit_channel_opened(channel, 0); 1294 } 1295 break; 1296 1297 case L2CAP_STATE_WAIT_DISCONNECT: 1298 switch (code) { 1299 case DISCONNECTION_RESPONSE: 1300 l2cap_finialize_channel_close(channel); 1301 break; 1302 default: 1303 //@TODO: implement other signaling packets 1304 break; 1305 } 1306 break; 1307 1308 case L2CAP_STATE_CLOSED: 1309 // @TODO handle incoming requests 1310 break; 1311 1312 case L2CAP_STATE_OPEN: 1313 //@TODO: implement other signaling packets, e.g. re-configure 1314 break; 1315 default: 1316 break; 1317 } 1318 // log_info("new state %u", channel->state); 1319 } 1320 1321 1322 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1323 1324 // get code, signalind identifier and command len 1325 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1326 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1327 1328 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1329 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1330 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1331 return; 1332 } 1333 1334 // general commands without an assigned channel 1335 switch(code) { 1336 1337 case CONNECTION_REQUEST: { 1338 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1339 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1340 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1341 return; 1342 } 1343 1344 case ECHO_REQUEST: 1345 l2cap_register_signaling_response(handle, code, sig_id, 0); 1346 return; 1347 1348 case INFORMATION_REQUEST: { 1349 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1350 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1351 return; 1352 } 1353 1354 default: 1355 break; 1356 } 1357 1358 1359 // Get potential destination CID 1360 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1361 1362 // Find channel for this sig_id and connection handle 1363 btstack_linked_list_iterator_t it; 1364 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1365 while (btstack_linked_list_iterator_has_next(&it)){ 1366 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1367 if (channel->con_handle != handle) continue; 1368 if (code & 1) { 1369 // match odd commands (responses) by previous signaling identifier 1370 if (channel->local_sig_id == sig_id) { 1371 l2cap_signaling_handler_channel(channel, command); 1372 break; 1373 } 1374 } else { 1375 // match even commands (requests) by local channel id 1376 if (channel->local_cid == dest_cid) { 1377 l2cap_signaling_handler_channel(channel, command); 1378 break; 1379 } 1380 } 1381 } 1382 } 1383 1384 static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ){ 1385 1386 // Get Channel ID 1387 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1388 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1389 1390 switch (channel_id) { 1391 1392 case L2CAP_CID_SIGNALING: { 1393 1394 uint16_t command_offset = 8; 1395 while (command_offset < size) { 1396 1397 // handle signaling commands 1398 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1399 1400 // increment command_offset 1401 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1402 } 1403 break; 1404 } 1405 1406 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1407 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1408 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1409 } 1410 break; 1411 1412 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1413 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1414 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1415 } 1416 break; 1417 1418 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1419 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1420 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1421 } 1422 break; 1423 1424 case L2CAP_CID_SIGNALING_LE: { 1425 switch (packet[8]){ 1426 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1427 uint16_t result = little_endian_read_16(packet, 12); 1428 l2cap_emit_connection_parameter_update_response(handle, result); 1429 break; 1430 } 1431 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1432 uint8_t event[10]; 1433 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1434 event[1] = 8; 1435 memcpy(&event[2], &packet[12], 8); 1436 1437 hci_connection_t * connection = hci_connection_for_handle(handle); 1438 if (connection){ 1439 if (connection->role != HCI_ROLE_MASTER){ 1440 // reject command without notifying upper layer when not in master role 1441 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1442 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1443 break; 1444 } 1445 int update_parameter = 1; 1446 le_connection_parameter_range_t existing_range; 1447 gap_get_connection_parameter_range(&existing_range); 1448 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1449 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1450 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1451 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1452 1453 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1454 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1455 1456 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1457 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1458 1459 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1460 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1461 1462 if (update_parameter){ 1463 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1464 connection->le_conn_interval_min = le_conn_interval_min; 1465 connection->le_conn_interval_max = le_conn_interval_max; 1466 connection->le_conn_latency = le_conn_latency; 1467 connection->le_supervision_timeout = le_supervision_timeout; 1468 } else { 1469 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1470 } 1471 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1472 } 1473 1474 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1475 if (!l2cap_event_packet_handler) break; 1476 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1477 break; 1478 } 1479 default: { 1480 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1481 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1482 break; 1483 } 1484 } 1485 break; 1486 } 1487 1488 default: { 1489 // Find channel for this channel_id and connection handle 1490 l2cap_channel_t * l2cap_channel = l2cap_get_channel_for_local_cid(channel_id); 1491 if (l2cap_channel) { 1492 l2cap_dispatch_to_channel(l2cap_channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1493 } 1494 break; 1495 } 1496 } 1497 1498 l2cap_run(); 1499 } 1500 1501 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1502 void l2cap_finialize_channel_close(l2cap_channel_t * channel){ 1503 channel->state = L2CAP_STATE_CLOSED; 1504 l2cap_emit_channel_closed(channel); 1505 // discard channel 1506 l2cap_stop_rtx(channel); 1507 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1508 btstack_memory_l2cap_channel_free(channel); 1509 } 1510 1511 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1512 btstack_linked_list_iterator_t it; 1513 btstack_linked_list_iterator_init(&it, services); 1514 while (btstack_linked_list_iterator_has_next(&it)){ 1515 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1516 if ( service->psm == psm){ 1517 return service; 1518 }; 1519 } 1520 return NULL; 1521 } 1522 1523 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1524 return l2cap_get_service_internal(&l2cap_services, psm); 1525 } 1526 1527 1528 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1529 1530 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1531 1532 // check for alread registered psm 1533 // TODO: emit error event 1534 l2cap_service_t *service = l2cap_get_service(psm); 1535 if (service) { 1536 log_error("l2cap_register_service: PSM %u already registered", psm); 1537 return L2CAP_SERVICE_ALREADY_REGISTERED; 1538 } 1539 1540 // alloc structure 1541 // TODO: emit error event 1542 service = btstack_memory_l2cap_service_get(); 1543 if (!service) { 1544 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1545 return BTSTACK_MEMORY_ALLOC_FAILED; 1546 } 1547 1548 // fill in 1549 service->psm = psm; 1550 service->mtu = mtu; 1551 service->packet_handler = service_packet_handler; 1552 service->required_security_level = security_level; 1553 1554 // add to services list 1555 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1556 1557 // enable page scan 1558 gap_connectable_control(1); 1559 1560 return 0; 1561 } 1562 1563 uint8_t l2cap_unregister_service(uint16_t psm){ 1564 1565 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1566 1567 l2cap_service_t *service = l2cap_get_service(psm); 1568 if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1569 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1570 btstack_memory_l2cap_service_free(service); 1571 1572 // disable page scan when no services registered 1573 if (btstack_linked_list_empty(&l2cap_services)) { 1574 gap_connectable_control(0); 1575 } 1576 return 0; 1577 } 1578 1579 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1580 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1581 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 1582 if (index < 0) return; 1583 fixed_channels[index].callback = the_packet_handler; 1584 } 1585 1586 #ifdef ENABLE_BLE 1587 1588 1589 #if 0 1590 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1591 return l2cap_get_service_internal(&l2cap_le_services, psm); 1592 } 1593 /** 1594 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1595 * @param 1596 */ 1597 void l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, 1598 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1599 1600 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1601 1602 // check for alread registered psm 1603 // TODO: emit error event 1604 l2cap_service_t *service = l2cap_le_get_service(psm); 1605 if (service) { 1606 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1607 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1608 return; 1609 } 1610 1611 // alloc structure 1612 // TODO: emit error event 1613 service = btstack_memory_l2cap_service_get(); 1614 if (!service) { 1615 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1616 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1617 return; 1618 } 1619 1620 // fill in 1621 service->psm = psm; 1622 service->mtu = mtu; 1623 service->mps = mps; 1624 service->packet_handler = packet_handler; 1625 service->required_security_level = security_level; 1626 1627 // add to services list 1628 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1629 1630 // done 1631 l2cap_emit_service_registered(connection, 0, psm); 1632 } 1633 1634 void l2cap_le_unregister_service(uint16_t psm) { 1635 1636 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1637 1638 l2cap_service_t *service = l2cap_le_get_service(psm); 1639 if (!service) return; 1640 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1641 btstack_memory_l2cap_service_free(service); 1642 } 1643 #endif 1644 #endif 1645