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 btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 714 while (btstack_linked_list_iterator_has_next(&it)){ 715 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 716 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 717 switch (channel->state){ 718 default: 719 break; 720 } 721 } 722 723 // send l2cap con paramter update if necessary 724 hci_connections_get_iterator(&it); 725 while(btstack_linked_list_iterator_has_next(&it)){ 726 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 727 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 728 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 729 switch (connection->le_con_parameter_update_state){ 730 case CON_PARAMETER_UPDATE_SEND_REQUEST: 731 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 732 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 733 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 734 break; 735 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 736 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 737 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 738 break; 739 case CON_PARAMETER_UPDATE_DENY: 740 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 741 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 742 break; 743 default: 744 break; 745 } 746 #if 0 747 void l2cap_le_run(void){ 748 for all channels 749 switch(state): 750 751 if outgoing transfer active 752 send next chunk 753 if done, notify app 754 } 755 #endif 756 } 757 #endif 758 759 // log_info("l2cap_run: exit"); 760 } 761 762 uint16_t l2cap_max_mtu(void){ 763 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 764 } 765 766 uint16_t l2cap_max_le_mtu(void){ 767 return l2cap_max_mtu(); 768 } 769 770 static void l2cap_handle_connection_complete(hci_con_handle_t con_handle, l2cap_channel_t * channel){ 771 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 772 log_info("l2cap_handle_connection_complete expected state"); 773 // success, start l2cap handshake 774 channel->con_handle = con_handle; 775 // check remote SSP feature first 776 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 777 } 778 } 779 780 #ifdef ENABLE_BLE 781 static void l2cap_handle_le_connection_complete(hci_con_handle_t con_handle, l2cap_channel_t * channel){ 782 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 783 log_info("l2cap_le_handle_connection_complete expected state"); 784 // success, start l2cap handshake 785 channel->con_handle = con_handle; 786 // ... 787 } 788 } 789 #endif 790 791 792 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 793 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 794 795 // we have been waiting for remote supported features, if both support SSP, 796 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)); 797 if (gap_ssp_supported_on_both_sides(channel->con_handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 798 // request security level 2 799 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 800 gap_request_security_level(channel->con_handle, LEVEL_2); 801 return; 802 } 803 // fine, go ahead 804 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 805 } 806 807 static l2cap_channel_t * l2cap_create_channel_entry(btstack_packet_handler_t packet_handler, bd_addr_t address, bd_addr_type_t address_type, 808 uint16_t psm, uint16_t local_mtu, gap_security_level_t security_level){ 809 810 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 811 if (!channel) { 812 return NULL; 813 } 814 815 // Init memory (make valgrind happy) 816 memset(channel, 0, sizeof(l2cap_channel_t)); 817 818 // fill in 819 channel->packet_handler = packet_handler; 820 bd_addr_copy(channel->address, address); 821 channel->address_type = address_type; 822 channel->psm = psm; 823 channel->local_mtu = local_mtu; 824 channel->remote_mtu = L2CAP_MINIMAL_MTU; 825 channel->required_security_level = security_level; 826 827 // 828 channel->local_cid = l2cap_next_local_cid(); 829 channel->con_handle = 0; 830 831 // set initial state 832 channel->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 833 channel->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 834 channel->remote_sig_id = L2CAP_SIG_ID_INVALID; 835 channel->local_sig_id = L2CAP_SIG_ID_INVALID; 836 return channel; 837 } 838 839 /** 840 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 841 * @param packet_handler 842 * @param address 843 * @param psm 844 * @param mtu 845 * @param local_cid 846 */ 847 848 uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t local_mtu, uint16_t * out_local_cid){ 849 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, local_mtu); 850 851 if (local_mtu > l2cap_max_mtu()) { 852 local_mtu = l2cap_max_mtu(); 853 } 854 855 l2cap_channel_t * channel = l2cap_create_channel_entry(channel_packet_handler, address, BD_ADDR_TYPE_CLASSIC, psm, local_mtu, LEVEL_0); 856 if (!channel) { 857 return BTSTACK_MEMORY_ALLOC_FAILED; 858 } 859 860 // add to connections list 861 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 862 863 // store local_cid 864 if (out_local_cid){ 865 *out_local_cid = channel->local_cid; 866 } 867 868 // check if hci connection is already usable 869 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 870 if (conn){ 871 log_info("l2cap_create_channel, hci connection already exists"); 872 l2cap_handle_connection_complete(conn->con_handle, channel); 873 // check if remote supported fearures are already received 874 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 875 l2cap_handle_remote_supported_features_received(channel); 876 } 877 } 878 879 l2cap_run(); 880 881 return 0; 882 } 883 884 void 885 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 886 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 887 // find channel for local_cid 888 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 889 if (channel) { 890 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 891 } 892 // process 893 l2cap_run(); 894 } 895 896 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 897 btstack_linked_list_iterator_t it; 898 btstack_linked_list_iterator_init(&it, &l2cap_channels); 899 while (btstack_linked_list_iterator_has_next(&it)){ 900 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 901 if ( bd_addr_cmp( channel->address, address) != 0) continue; 902 // channel for this address found 903 switch (channel->state){ 904 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 905 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 906 // failure, forward error code 907 l2cap_emit_channel_opened(channel, status); 908 // discard channel 909 l2cap_stop_rtx(channel); 910 btstack_linked_list_iterator_remove(&it); 911 btstack_memory_l2cap_channel_free(channel); 912 break; 913 default: 914 break; 915 } 916 } 917 } 918 919 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 920 btstack_linked_list_iterator_t it; 921 btstack_linked_list_iterator_init(&it, &l2cap_channels); 922 while (btstack_linked_list_iterator_has_next(&it)){ 923 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 924 if ( ! bd_addr_cmp( channel->address, address) ){ 925 l2cap_handle_connection_complete(handle, channel); 926 } 927 } 928 // process 929 l2cap_run(); 930 } 931 932 static void l2cap_notify_channel_can_send(void){ 933 btstack_linked_list_iterator_t it; 934 btstack_linked_list_iterator_init(&it, &l2cap_channels); 935 while (btstack_linked_list_iterator_has_next(&it)){ 936 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 937 if (!channel->waiting_for_can_send_now) continue; 938 if (!hci_can_send_acl_packet_now(channel->con_handle)) continue; 939 channel->waiting_for_can_send_now = 0; 940 l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 941 } 942 943 int i; 944 for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 945 if (!fixed_channels[i].callback) continue; 946 if (!fixed_channels[i].waiting_for_can_send_now) continue; 947 int can_send; 948 if (l2cap_fixed_channel_table_index_is_le(i)){ 949 can_send = hci_can_send_acl_le_packet_now(); 950 } else { 951 can_send = hci_can_send_acl_classic_packet_now(); 952 } 953 if (!can_send) continue; 954 fixed_channels[i].waiting_for_can_send_now = 0; 955 l2cap_emit_can_send_now(fixed_channels[i].callback, l2cap_fixed_channel_table_channel_id_for_index(i)); 956 } 957 } 958 959 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 960 961 bd_addr_t address; 962 hci_con_handle_t handle; 963 btstack_linked_list_iterator_t it; 964 int hci_con_used; 965 966 switch(hci_event_packet_get_type(packet)){ 967 968 // handle connection complete events 969 case HCI_EVENT_CONNECTION_COMPLETE: 970 reverse_bd_addr(&packet[5], address); 971 if (packet[2] == 0){ 972 handle = little_endian_read_16(packet, 3); 973 l2cap_handle_connection_success_for_addr(address, handle); 974 } else { 975 l2cap_handle_connection_failed_for_addr(address, packet[2]); 976 } 977 break; 978 979 // handle successful create connection cancel command 980 case HCI_EVENT_COMMAND_COMPLETE: 981 if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_create_connection_cancel)) { 982 if (packet[5] == 0){ 983 reverse_bd_addr(&packet[6], address); 984 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 985 l2cap_handle_connection_failed_for_addr(address, 0x16); 986 } 987 } 988 l2cap_run(); // try sending signaling packets first 989 break; 990 991 case HCI_EVENT_COMMAND_STATUS: 992 l2cap_run(); // try sending signaling packets first 993 break; 994 995 // handle disconnection complete events 996 case HCI_EVENT_DISCONNECTION_COMPLETE: 997 // send l2cap disconnect events for all channels on this handle and free them 998 handle = little_endian_read_16(packet, 3); 999 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1000 while (btstack_linked_list_iterator_has_next(&it)){ 1001 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1002 if (channel->con_handle != handle) continue; 1003 l2cap_emit_channel_closed(channel); 1004 l2cap_stop_rtx(channel); 1005 btstack_linked_list_iterator_remove(&it); 1006 btstack_memory_l2cap_channel_free(channel); 1007 } 1008 break; 1009 1010 // Notify channel packet handler if they can send now 1011 case HCI_EVENT_TRANSPORT_PACKET_SENT: 1012 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 1013 l2cap_run(); // try sending signaling packets first 1014 l2cap_notify_channel_can_send(); 1015 break; 1016 1017 // HCI Connection Timeouts 1018 case L2CAP_EVENT_TIMEOUT_CHECK: 1019 handle = little_endian_read_16(packet, 2); 1020 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 1021 if (hci_authentication_active_for_handle(handle)) break; 1022 hci_con_used = 0; 1023 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1024 while (btstack_linked_list_iterator_has_next(&it)){ 1025 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1026 if (channel->con_handle != handle) continue; 1027 hci_con_used = 1; 1028 break; 1029 } 1030 if (hci_con_used) break; 1031 if (!hci_can_send_command_packet_now()) break; 1032 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 1033 break; 1034 1035 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1036 handle = little_endian_read_16(packet, 3); 1037 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1038 while (btstack_linked_list_iterator_has_next(&it)){ 1039 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1040 if (channel->con_handle != handle) continue; 1041 l2cap_handle_remote_supported_features_received(channel); 1042 break; 1043 } 1044 break; 1045 1046 case GAP_EVENT_SECURITY_LEVEL: 1047 handle = little_endian_read_16(packet, 2); 1048 log_info("l2cap - security level update"); 1049 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1050 while (btstack_linked_list_iterator_has_next(&it)){ 1051 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1052 if (channel->con_handle != handle) continue; 1053 1054 log_info("l2cap - state %u", channel->state); 1055 1056 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 1057 gap_security_level_t required_level = channel->required_security_level; 1058 1059 switch (channel->state){ 1060 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 1061 if (actual_level >= required_level){ 1062 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1063 l2cap_emit_connection_request(channel); 1064 } else { 1065 channel->reason = 0x0003; // security block 1066 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1067 } 1068 break; 1069 1070 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1071 if (actual_level >= required_level){ 1072 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1073 } else { 1074 // disconnnect, authentication not good enough 1075 hci_disconnect_security_block(handle); 1076 } 1077 break; 1078 1079 default: 1080 break; 1081 } 1082 } 1083 break; 1084 1085 default: 1086 break; 1087 } 1088 1089 l2cap_run(); 1090 } 1091 1092 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1093 channel->remote_sig_id = identifier; 1094 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1095 l2cap_run(); 1096 } 1097 1098 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1099 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1100 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1101 signaling_responses[signaling_responses_pending].handle = handle; 1102 signaling_responses[signaling_responses_pending].code = code; 1103 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1104 signaling_responses[signaling_responses_pending].data = data; 1105 signaling_responses_pending++; 1106 l2cap_run(); 1107 } 1108 } 1109 1110 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1111 1112 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1113 l2cap_service_t *service = l2cap_get_service(psm); 1114 if (!service) { 1115 // 0x0002 PSM not supported 1116 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1117 return; 1118 } 1119 1120 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1121 if (!hci_connection) { 1122 // 1123 log_error("no hci_connection for handle %u", handle); 1124 return; 1125 } 1126 1127 // alloc structure 1128 // log_info("l2cap_handle_connection_request register channel"); 1129 l2cap_channel_t * channel = l2cap_create_channel_entry(service->packet_handler, hci_connection->address, BD_ADDR_TYPE_CLASSIC, 1130 psm, service->mtu, service->required_security_level); 1131 if (!channel){ 1132 // 0x0004 No resources available 1133 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1134 return; 1135 } 1136 1137 channel->con_handle = handle; 1138 channel->remote_cid = source_cid; 1139 channel->remote_sig_id = sig_id; 1140 1141 // limit local mtu to max acl packet length - l2cap header 1142 if (channel->local_mtu > l2cap_max_mtu()) { 1143 channel->local_mtu = l2cap_max_mtu(); 1144 } 1145 1146 // set initial state 1147 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1148 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1149 1150 // add to connections list 1151 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1152 1153 // assert security requirements 1154 gap_request_security_level(handle, channel->required_security_level); 1155 } 1156 1157 void l2cap_accept_connection(uint16_t local_cid){ 1158 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1159 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1160 if (!channel) { 1161 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1162 return; 1163 } 1164 1165 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1166 1167 // process 1168 l2cap_run(); 1169 } 1170 1171 void l2cap_decline_connection(uint16_t local_cid){ 1172 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x", local_cid); 1173 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1174 if (!channel) { 1175 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1176 return; 1177 } 1178 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1179 channel->reason = 0x04; // no resources available 1180 l2cap_run(); 1181 } 1182 1183 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1184 1185 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1186 1187 uint16_t flags = little_endian_read_16(command, 6); 1188 if (flags & 1) { 1189 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1190 } 1191 1192 // accept the other's configuration options 1193 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1194 uint16_t pos = 8; 1195 while (pos < end_pos){ 1196 uint8_t option_hint = command[pos] >> 7; 1197 uint8_t option_type = command[pos] & 0x7f; 1198 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1199 pos++; 1200 uint8_t length = command[pos++]; 1201 // MTU { type(8): 1, len(8):2, MTU(16) } 1202 if (option_type == 1 && length == 2){ 1203 channel->remote_mtu = little_endian_read_16(command, pos); 1204 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1205 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1206 } 1207 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1208 if (option_type == 2 && length == 2){ 1209 channel->flush_timeout = little_endian_read_16(command, pos); 1210 } 1211 // check for unknown options 1212 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1213 log_info("l2cap cid %u, unknown options", channel->local_cid); 1214 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1215 } 1216 pos += length; 1217 } 1218 } 1219 1220 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1221 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1222 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1223 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1224 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1225 if (channel->state == L2CAP_STATE_OPEN) return 0; 1226 return 1; 1227 } 1228 1229 1230 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1231 1232 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1233 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1234 uint16_t result = 0; 1235 1236 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1237 1238 // handle DISCONNECT REQUESTS seperately 1239 if (code == DISCONNECTION_REQUEST){ 1240 switch (channel->state){ 1241 case L2CAP_STATE_CONFIG: 1242 case L2CAP_STATE_OPEN: 1243 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1244 case L2CAP_STATE_WAIT_DISCONNECT: 1245 l2cap_handle_disconnect_request(channel, identifier); 1246 break; 1247 1248 default: 1249 // ignore in other states 1250 break; 1251 } 1252 return; 1253 } 1254 1255 // @STATEMACHINE(l2cap) 1256 switch (channel->state) { 1257 1258 case L2CAP_STATE_WAIT_CONNECT_RSP: 1259 switch (code){ 1260 case CONNECTION_RESPONSE: 1261 l2cap_stop_rtx(channel); 1262 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1263 switch (result) { 1264 case 0: 1265 // successful connection 1266 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1267 channel->state = L2CAP_STATE_CONFIG; 1268 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1269 break; 1270 case 1: 1271 // connection pending. get some coffee, but start the ERTX 1272 l2cap_start_ertx(channel); 1273 break; 1274 default: 1275 // channel closed 1276 channel->state = L2CAP_STATE_CLOSED; 1277 // map l2cap connection response result to BTstack status enumeration 1278 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1279 1280 // drop link key if security block 1281 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1282 gap_drop_link_key_for_bd_addr(channel->address); 1283 } 1284 1285 // discard channel 1286 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1287 btstack_memory_l2cap_channel_free(channel); 1288 break; 1289 } 1290 break; 1291 1292 default: 1293 //@TODO: implement other signaling packets 1294 break; 1295 } 1296 break; 1297 1298 case L2CAP_STATE_CONFIG: 1299 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1300 switch (code) { 1301 case CONFIGURE_REQUEST: 1302 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1303 l2cap_signaling_handle_configure_request(channel, command); 1304 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1305 // only done if continuation not set 1306 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1307 } 1308 break; 1309 case CONFIGURE_RESPONSE: 1310 l2cap_stop_rtx(channel); 1311 switch (result){ 1312 case 0: // success 1313 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1314 break; 1315 case 4: // pending 1316 l2cap_start_ertx(channel); 1317 break; 1318 default: 1319 // retry on negative result 1320 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1321 break; 1322 } 1323 break; 1324 default: 1325 break; 1326 } 1327 if (l2cap_channel_ready_for_open(channel)){ 1328 // for open: 1329 channel->state = L2CAP_STATE_OPEN; 1330 l2cap_emit_channel_opened(channel, 0); 1331 } 1332 break; 1333 1334 case L2CAP_STATE_WAIT_DISCONNECT: 1335 switch (code) { 1336 case DISCONNECTION_RESPONSE: 1337 l2cap_finialize_channel_close(channel); 1338 break; 1339 default: 1340 //@TODO: implement other signaling packets 1341 break; 1342 } 1343 break; 1344 1345 case L2CAP_STATE_CLOSED: 1346 // @TODO handle incoming requests 1347 break; 1348 1349 case L2CAP_STATE_OPEN: 1350 //@TODO: implement other signaling packets, e.g. re-configure 1351 break; 1352 default: 1353 break; 1354 } 1355 // log_info("new state %u", channel->state); 1356 } 1357 1358 1359 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1360 1361 // get code, signalind identifier and command len 1362 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1363 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1364 1365 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1366 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1367 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1368 return; 1369 } 1370 1371 // general commands without an assigned channel 1372 switch(code) { 1373 1374 case CONNECTION_REQUEST: { 1375 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1376 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1377 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1378 return; 1379 } 1380 1381 case ECHO_REQUEST: 1382 l2cap_register_signaling_response(handle, code, sig_id, 0); 1383 return; 1384 1385 case INFORMATION_REQUEST: { 1386 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1387 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1388 return; 1389 } 1390 1391 default: 1392 break; 1393 } 1394 1395 1396 // Get potential destination CID 1397 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1398 1399 // Find channel for this sig_id and connection handle 1400 btstack_linked_list_iterator_t it; 1401 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1402 while (btstack_linked_list_iterator_has_next(&it)){ 1403 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1404 if (channel->con_handle != handle) continue; 1405 if (code & 1) { 1406 // match odd commands (responses) by previous signaling identifier 1407 if (channel->local_sig_id == sig_id) { 1408 l2cap_signaling_handler_channel(channel, command); 1409 break; 1410 } 1411 } else { 1412 // match even commands (requests) by local channel id 1413 if (channel->local_cid == dest_cid) { 1414 l2cap_signaling_handler_channel(channel, command); 1415 break; 1416 } 1417 } 1418 } 1419 } 1420 1421 static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ){ 1422 1423 // Get Channel ID 1424 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1425 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1426 1427 switch (channel_id) { 1428 1429 case L2CAP_CID_SIGNALING: { 1430 1431 uint16_t command_offset = 8; 1432 while (command_offset < size) { 1433 1434 // handle signaling commands 1435 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1436 1437 // increment command_offset 1438 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1439 } 1440 break; 1441 } 1442 1443 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1444 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1445 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1446 } 1447 break; 1448 1449 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1450 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1451 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1452 } 1453 break; 1454 1455 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1456 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1457 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1458 } 1459 break; 1460 1461 case L2CAP_CID_SIGNALING_LE: { 1462 switch (packet[8]){ 1463 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1464 uint16_t result = little_endian_read_16(packet, 12); 1465 l2cap_emit_connection_parameter_update_response(handle, result); 1466 break; 1467 } 1468 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1469 uint8_t event[10]; 1470 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1471 event[1] = 8; 1472 memcpy(&event[2], &packet[12], 8); 1473 1474 hci_connection_t * connection = hci_connection_for_handle(handle); 1475 if (connection){ 1476 if (connection->role != HCI_ROLE_MASTER){ 1477 // reject command without notifying upper layer when not in master role 1478 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1479 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1480 break; 1481 } 1482 int update_parameter = 1; 1483 le_connection_parameter_range_t existing_range; 1484 gap_get_connection_parameter_range(&existing_range); 1485 uint16_t le_conn_interval_min = little_endian_read_16(packet,12); 1486 uint16_t le_conn_interval_max = little_endian_read_16(packet,14); 1487 uint16_t le_conn_latency = little_endian_read_16(packet,16); 1488 uint16_t le_supervision_timeout = little_endian_read_16(packet,18); 1489 1490 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1491 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1492 1493 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1494 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1495 1496 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1497 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1498 1499 if (update_parameter){ 1500 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1501 connection->le_conn_interval_min = le_conn_interval_min; 1502 connection->le_conn_interval_max = le_conn_interval_max; 1503 connection->le_conn_latency = le_conn_latency; 1504 connection->le_supervision_timeout = le_supervision_timeout; 1505 } else { 1506 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1507 } 1508 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1509 } 1510 1511 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1512 if (!l2cap_event_packet_handler) break; 1513 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1514 break; 1515 } 1516 default: { 1517 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1518 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1519 break; 1520 } 1521 } 1522 break; 1523 } 1524 1525 default: { 1526 // Find channel for this channel_id and connection handle 1527 l2cap_channel_t * l2cap_channel = l2cap_get_channel_for_local_cid(channel_id); 1528 if (l2cap_channel) { 1529 l2cap_dispatch_to_channel(l2cap_channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1530 } 1531 break; 1532 } 1533 } 1534 1535 l2cap_run(); 1536 } 1537 1538 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1539 void l2cap_finialize_channel_close(l2cap_channel_t * channel){ 1540 channel->state = L2CAP_STATE_CLOSED; 1541 l2cap_emit_channel_closed(channel); 1542 // discard channel 1543 l2cap_stop_rtx(channel); 1544 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1545 btstack_memory_l2cap_channel_free(channel); 1546 } 1547 1548 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1549 btstack_linked_list_iterator_t it; 1550 btstack_linked_list_iterator_init(&it, services); 1551 while (btstack_linked_list_iterator_has_next(&it)){ 1552 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1553 if ( service->psm == psm){ 1554 return service; 1555 }; 1556 } 1557 return NULL; 1558 } 1559 1560 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1561 return l2cap_get_service_internal(&l2cap_services, psm); 1562 } 1563 1564 1565 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1566 1567 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1568 1569 // check for alread registered psm 1570 l2cap_service_t *service = l2cap_get_service(psm); 1571 if (service) { 1572 log_error("l2cap_register_service: PSM %u already registered", psm); 1573 return L2CAP_SERVICE_ALREADY_REGISTERED; 1574 } 1575 1576 // alloc structure 1577 service = btstack_memory_l2cap_service_get(); 1578 if (!service) { 1579 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1580 return BTSTACK_MEMORY_ALLOC_FAILED; 1581 } 1582 1583 // fill in 1584 service->psm = psm; 1585 service->mtu = mtu; 1586 service->packet_handler = service_packet_handler; 1587 service->required_security_level = security_level; 1588 1589 // add to services list 1590 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1591 1592 // enable page scan 1593 gap_connectable_control(1); 1594 1595 return 0; 1596 } 1597 1598 uint8_t l2cap_unregister_service(uint16_t psm){ 1599 1600 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1601 1602 l2cap_service_t *service = l2cap_get_service(psm); 1603 if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1604 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1605 btstack_memory_l2cap_service_free(service); 1606 1607 // disable page scan when no services registered 1608 if (btstack_linked_list_empty(&l2cap_services)) { 1609 gap_connectable_control(0); 1610 } 1611 return 0; 1612 } 1613 1614 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1615 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1616 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 1617 if (index < 0) return; 1618 fixed_channels[index].callback = the_packet_handler; 1619 } 1620 1621 #ifdef ENABLE_BLE 1622 1623 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1624 return l2cap_get_service_internal(&l2cap_le_services, psm); 1625 } 1626 1627 uint8_t l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, gap_security_level_t security_level){ 1628 1629 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x", psm); 1630 1631 // check for alread registered psm 1632 l2cap_service_t *service = l2cap_le_get_service(psm); 1633 if (service) { 1634 return L2CAP_SERVICE_ALREADY_REGISTERED; 1635 } 1636 1637 // alloc structure 1638 service = btstack_memory_l2cap_service_get(); 1639 if (!service) { 1640 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1641 return BTSTACK_MEMORY_ALLOC_FAILED; 1642 } 1643 1644 // fill in 1645 service->psm = psm; 1646 service->mtu = 0; 1647 service->packet_handler = packet_handler; 1648 service->required_security_level = security_level; 1649 1650 // add to services list 1651 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1652 1653 // done 1654 return 0; 1655 } 1656 1657 uint8_t l2cap_le_unregister_service(uint16_t psm) { 1658 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1659 l2cap_service_t *service = l2cap_le_get_service(psm); 1660 if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1661 1662 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1663 btstack_memory_l2cap_service_free(service); 1664 return 0; 1665 } 1666 1667 uint8_t l2cap_le_accept_connection(uint16_t local_cid, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits){ 1668 // get connection 1669 // bail if missing 1670 // set mtu and receive buffer 1671 // check state 1672 // set state accept connection 1673 // l2cap_le_run() 1674 return 0; 1675 } 1676 1677 /** 1678 * @brief Deny incoming LE Data Channel connection due to resource constraints 1679 * @param local_cid L2CAP LE Data Channel Identifier 1680 */ 1681 1682 uint8_t l2cap_le_decline_connection(uint16_t local_cid){ 1683 // get connection 1684 // bail if missing 1685 // check state 1686 // set state decline connection 1687 // l2cap_le_run() 1688 return 0; 1689 } 1690 1691 uint8_t l2cap_le_create_channel(btstack_packet_handler_t packet_handler, bd_addr_t address, bd_addr_type_t address_type, 1692 uint16_t psm, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits, gap_security_level_t security_level, 1693 uint16_t * out_local_cid) { 1694 1695 log_info("L2CAP_LE_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 1696 1697 l2cap_channel_t * channel = l2cap_create_channel_entry(packet_handler, address, BD_ADDR_TYPE_CLASSIC, psm, mtu, LEVEL_0); 1698 if (!channel) { 1699 return BTSTACK_MEMORY_ALLOC_FAILED; 1700 } 1701 1702 // store local_cid 1703 if (out_local_cid){ 1704 *out_local_cid = channel->local_cid; 1705 } 1706 1707 // add to connections list 1708 btstack_linked_list_add(&l2cap_le_channels, (btstack_linked_item_t *) channel); 1709 1710 // check if hci connection is already usable 1711 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, address_type); 1712 1713 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 1714 1715 if (conn){ 1716 log_info("l2cap_le_create_channel, hci connection already exists"); 1717 l2cap_handle_le_connection_complete(conn->con_handle, channel); 1718 } else { 1719 1720 // 1721 // TODO: start timer 1722 // .. 1723 1724 // start connection 1725 uint8_t res = gap_auto_connection_start(address_type, address); 1726 if (!res){ 1727 // discard channel object 1728 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1729 btstack_memory_l2cap_channel_free(channel); 1730 return res; 1731 } 1732 } 1733 return 0; 1734 } 1735 1736 /** 1737 * @brief Provide credtis for LE Data Channel 1738 * @param local_cid L2CAP LE Data Channel Identifier 1739 * @param credits Number additional credits for peer 1740 */ 1741 uint8_t l2cap_le_provide_credits(uint16_t cid, uint16_t credits){ 1742 // get connection 1743 // bail if missing 1744 // check state 1745 // check incoming credits + credits <= 0xffff 1746 // set credits_granted 1747 // l2cap_le_run() 1748 return 0; 1749 } 1750 1751 /** 1752 * @brief Check if outgoing buffer is available and that there's space on the Bluetooth module 1753 * @param local_cid L2CAP LE Data Channel Identifier 1754 */ 1755 int l2cap_le_can_send_now(uint16_t cid){ 1756 // check if data can be sent via le at all 1757 return 0; 1758 } 1759 1760 /** 1761 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible 1762 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function 1763 * so packet handler should be ready to handle it 1764 * @param local_cid L2CAP LE Data Channel Identifier 1765 */ 1766 uint8_t l2cap_le_request_can_send_now_event(uint16_t cid){ 1767 // same as for non-le 1768 return 0; 1769 } 1770 1771 /** 1772 * @brief Send data via LE Data Channel 1773 * @note Since data larger then the maximum PDU needs to be segmented into multiple PDUs, data needs to stay valid until ... event 1774 * @param local_cid L2CAP LE Data Channel Identifier 1775 * @param data data to send 1776 * @param size data size 1777 */ 1778 uint8_t l2cap_le_send_data(uint16_t cid, uint8_t * data, uint16_t size){ 1779 // check if no outgoing data is pending 1780 // store info 1781 // l2cap_le_run() 1782 return 0; 1783 } 1784 1785 /** 1786 * @brief Disconnect from LE Data Channel 1787 * @param local_cid L2CAP LE Data Channel Identifier 1788 */ 1789 uint8_t l2cap_le_disconnect(uint16_t cid) 1790 { 1791 // find channel 1792 // check state 1793 // set state SEND_DISCONNECT 1794 return 0; 1795 } 1796 1797 #endif 1798