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 static l2cap_channel_t * l2cap_get_le_channel_for_address_and_addr_type(bd_addr_t address, bd_addr_type_t address_type){ 250 btstack_linked_list_iterator_t it; 251 btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 252 while (btstack_linked_list_iterator_has_next(&it)){ 253 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 254 if (channel->address_type != address_type) continue; 255 if (bd_addr_cmp(channel->address, address)) continue; 256 return channel; 257 } 258 return NULL; 259 } 260 261 /// 262 263 void l2cap_request_can_send_now_event(uint16_t local_cid){ 264 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 265 if (!channel) return; 266 channel->waiting_for_can_send_now = 1; 267 l2cap_notify_channel_can_send(); 268 } 269 270 void l2cap_request_can_send_fix_channel_now_event(hci_con_handle_t con_handle, uint16_t channel_id){ 271 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 272 if (index < 0) return; 273 fixed_channels[index].waiting_for_can_send_now = 1; 274 l2cap_notify_channel_can_send(); 275 } 276 277 /// 278 279 int l2cap_can_send_packet_now(uint16_t local_cid){ 280 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 281 if (!channel) return 0; 282 return hci_can_send_acl_packet_now(channel->con_handle); 283 } 284 285 int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 286 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 287 if (!channel) return 0; 288 return hci_can_send_prepared_acl_packet_now(channel->con_handle); 289 } 290 291 int l2cap_can_send_fixed_channel_packet_now(hci_con_handle_t con_handle, uint16_t channel_id){ 292 return hci_can_send_acl_packet_now(con_handle); 293 } 294 295 /// 296 297 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 298 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 299 if (channel) { 300 return channel->remote_mtu; 301 } 302 return 0; 303 } 304 305 static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 306 btstack_linked_list_iterator_t it; 307 btstack_linked_list_iterator_init(&it, &l2cap_channels); 308 while (btstack_linked_list_iterator_has_next(&it)){ 309 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 310 if ( &channel->rtx == ts) { 311 return channel; 312 } 313 } 314 return NULL; 315 } 316 317 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 318 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 319 if (!channel) return; 320 321 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 322 323 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 324 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 325 // notify client 326 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 327 328 // discard channel 329 // no need to stop timer here, it is removed from list during timer callback 330 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 331 btstack_memory_l2cap_channel_free(channel); 332 } 333 334 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 335 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 336 btstack_run_loop_remove_timer(&channel->rtx); 337 } 338 339 static void l2cap_start_rtx(l2cap_channel_t * channel){ 340 l2cap_stop_rtx(channel); 341 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 342 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 343 btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 344 btstack_run_loop_add_timer(&channel->rtx); 345 } 346 347 static void l2cap_start_ertx(l2cap_channel_t * channel){ 348 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 349 l2cap_stop_rtx(channel); 350 btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 351 btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 352 btstack_run_loop_add_timer(&channel->rtx); 353 } 354 355 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 356 require_security_level2_for_outgoing_sdp = 1; 357 } 358 359 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 360 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 361 } 362 363 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 364 365 if (!hci_can_send_acl_packet_now(handle)){ 366 log_info("l2cap_send_signaling_packet, cannot send"); 367 return BTSTACK_ACL_BUFFERS_FULL; 368 } 369 370 // log_info("l2cap_send_signaling_packet type %u", cmd); 371 hci_reserve_packet_buffer(); 372 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 373 va_list argptr; 374 va_start(argptr, identifier); 375 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 376 va_end(argptr); 377 // log_info("l2cap_send_signaling_packet con %u!", handle); 378 return hci_send_acl_packet_buffer(len); 379 } 380 381 #ifdef ENABLE_BLE 382 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 383 384 if (!hci_can_send_acl_packet_now(handle)){ 385 log_info("l2cap_send_signaling_packet, cannot send"); 386 return BTSTACK_ACL_BUFFERS_FULL; 387 } 388 389 // log_info("l2cap_send_signaling_packet type %u", cmd); 390 hci_reserve_packet_buffer(); 391 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 392 va_list argptr; 393 va_start(argptr, identifier); 394 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 395 va_end(argptr); 396 // log_info("l2cap_send_signaling_packet con %u!", handle); 397 return hci_send_acl_packet_buffer(len); 398 } 399 #endif 400 401 uint8_t *l2cap_get_outgoing_buffer(void){ 402 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 403 } 404 405 int l2cap_reserve_packet_buffer(void){ 406 return hci_reserve_packet_buffer(); 407 } 408 409 void l2cap_release_packet_buffer(void){ 410 hci_release_packet_buffer(); 411 } 412 413 414 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 415 416 if (!hci_is_packet_buffer_reserved()){ 417 log_error("l2cap_send_prepared called without reserving packet first"); 418 return BTSTACK_ACL_BUFFERS_FULL; 419 } 420 421 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 422 if (!channel) { 423 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 424 return -1; // TODO: define error 425 } 426 427 if (!hci_can_send_prepared_acl_packet_now(channel->con_handle)){ 428 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 429 return BTSTACK_ACL_BUFFERS_FULL; 430 } 431 432 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->con_handle); 433 434 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 435 436 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 437 438 // 0 - Connection handle : PB=pb : BC=00 439 little_endian_store_16(acl_buffer, 0, channel->con_handle | (pb << 12) | (0 << 14)); 440 // 2 - ACL length 441 little_endian_store_16(acl_buffer, 2, len + 4); 442 // 4 - L2CAP packet length 443 little_endian_store_16(acl_buffer, 4, len + 0); 444 // 6 - L2CAP channel DEST 445 little_endian_store_16(acl_buffer, 6, channel->remote_cid); 446 // send 447 int err = hci_send_acl_packet_buffer(len+8); 448 449 return err; 450 } 451 452 int l2cap_send_prepared_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint16_t len){ 453 454 if (!hci_is_packet_buffer_reserved()){ 455 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 456 return BTSTACK_ACL_BUFFERS_FULL; 457 } 458 459 if (!hci_can_send_prepared_acl_packet_now(con_handle)){ 460 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", con_handle, cid); 461 return BTSTACK_ACL_BUFFERS_FULL; 462 } 463 464 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", con_handle, cid); 465 466 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 467 468 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 469 470 // 0 - Connection handle : PB=pb : BC=00 471 little_endian_store_16(acl_buffer, 0, con_handle | (pb << 12) | (0 << 14)); 472 // 2 - ACL length 473 little_endian_store_16(acl_buffer, 2, len + 4); 474 // 4 - L2CAP packet length 475 little_endian_store_16(acl_buffer, 4, len + 0); 476 // 6 - L2CAP channel DEST 477 little_endian_store_16(acl_buffer, 6, cid); 478 // send 479 int err = hci_send_acl_packet_buffer(len+8); 480 481 return err; 482 } 483 484 int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 485 486 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 487 if (!channel) { 488 log_error("l2cap_send no channel for cid 0x%02x", local_cid); 489 return -1; // TODO: define error 490 } 491 492 if (len > channel->remote_mtu){ 493 log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 494 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 495 } 496 497 if (!hci_can_send_acl_packet_now(channel->con_handle)){ 498 log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 499 return BTSTACK_ACL_BUFFERS_FULL; 500 } 501 502 hci_reserve_packet_buffer(); 503 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 504 505 memcpy(&acl_buffer[8], data, len); 506 507 return l2cap_send_prepared(local_cid, len); 508 } 509 510 int l2cap_send_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint8_t *data, uint16_t len){ 511 512 if (!hci_can_send_acl_packet_now(con_handle)){ 513 log_info("l2cap_send cid 0x%02x, cannot send", cid); 514 return BTSTACK_ACL_BUFFERS_FULL; 515 } 516 517 hci_reserve_packet_buffer(); 518 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 519 520 memcpy(&acl_buffer[8], data, len); 521 522 return l2cap_send_prepared_connectionless(con_handle, cid, len); 523 } 524 525 int l2cap_send_echo_request(hci_con_handle_t con_handle, uint8_t *data, uint16_t len){ 526 return l2cap_send_signaling_packet(con_handle, ECHO_REQUEST, 0x77, len, data); 527 } 528 529 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 530 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 531 } 532 533 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 534 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 535 } 536 537 538 539 // MARK: L2CAP_RUN 540 // process outstanding signaling tasks 541 static void l2cap_run(void){ 542 543 // log_info("l2cap_run: entered"); 544 545 // check pending signaling responses 546 while (signaling_responses_pending){ 547 548 hci_con_handle_t handle = signaling_responses[0].handle; 549 550 if (!hci_can_send_acl_packet_now(handle)) break; 551 552 uint8_t sig_id = signaling_responses[0].sig_id; 553 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 554 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 555 uint8_t response_code = signaling_responses[0].code; 556 557 // remove first item before sending (to avoid sending response mutliple times) 558 signaling_responses_pending--; 559 int i; 560 for (i=0; i < signaling_responses_pending; i++){ 561 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 562 } 563 564 switch (response_code){ 565 case CONNECTION_REQUEST: 566 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 567 // also disconnect if result is 0x0003 - security blocked 568 if (result == 0x0003){ 569 hci_disconnect_security_block(handle); 570 } 571 break; 572 case ECHO_REQUEST: 573 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 574 break; 575 case INFORMATION_REQUEST: 576 switch (infoType){ 577 case 1: { // Connectionless MTU 578 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 579 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 580 break; 581 } 582 case 2: { // Extended Features Supported 583 // extended features request supported, features: fixed channels, unicast connectionless data reception 584 uint32_t features = 0x280; 585 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 586 break; 587 } 588 case 3: { // Fixed Channels Supported 589 uint8_t map[8]; 590 memset(map, 0, 8); 591 map[0] = 0x06; // L2CAP Signaling Channel (0x02) + Connectionless reception (0x04) 592 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 593 break; 594 } 595 default: 596 // all other types are not supported 597 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 598 break; 599 } 600 break; 601 case COMMAND_REJECT: 602 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 603 #ifdef ENABLE_BLE 604 case COMMAND_REJECT_LE: 605 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 606 break; 607 #endif 608 default: 609 // should not happen 610 break; 611 } 612 } 613 614 uint8_t config_options[4]; 615 btstack_linked_list_iterator_t it; 616 btstack_linked_list_iterator_init(&it, &l2cap_channels); 617 while (btstack_linked_list_iterator_has_next(&it)){ 618 619 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 620 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 621 switch (channel->state){ 622 623 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 624 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 625 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 626 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 627 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 628 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 629 } 630 break; 631 632 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 633 if (!hci_can_send_command_packet_now()) break; 634 // send connection request - set state first 635 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 636 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 637 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 638 break; 639 640 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 641 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 642 channel->state = L2CAP_STATE_INVALID; 643 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 644 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 645 l2cap_stop_rtx(channel); 646 btstack_linked_list_iterator_remove(&it); 647 btstack_memory_l2cap_channel_free(channel); 648 break; 649 650 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 651 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 652 channel->state = L2CAP_STATE_CONFIG; 653 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 654 l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 655 break; 656 657 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 658 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 659 // success, start l2cap handshake 660 channel->local_sig_id = l2cap_next_sig_id(); 661 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 662 l2cap_send_signaling_packet( channel->con_handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 663 l2cap_start_rtx(channel); 664 break; 665 666 case L2CAP_STATE_CONFIG: 667 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 668 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 669 uint16_t flags = 0; 670 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 671 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 672 flags = 1; 673 } else { 674 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 675 } 676 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 677 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 678 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 679 config_options[0] = 1; // MTU 680 config_options[1] = 2; // len param 681 little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 682 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 683 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 684 } else { 685 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 686 } 687 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 688 } 689 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 690 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 691 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 692 channel->local_sig_id = l2cap_next_sig_id(); 693 config_options[0] = 1; // MTU 694 config_options[1] = 2; // len param 695 little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 696 l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 697 l2cap_start_rtx(channel); 698 } 699 if (l2cap_channel_ready_for_open(channel)){ 700 channel->state = L2CAP_STATE_OPEN; 701 l2cap_emit_channel_opened(channel, 0); // success 702 } 703 break; 704 705 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 706 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 707 channel->state = L2CAP_STATE_INVALID; 708 l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 709 // 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 :) 710 l2cap_finialize_channel_close(channel); // -- remove from list 711 break; 712 713 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 714 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 715 channel->local_sig_id = l2cap_next_sig_id(); 716 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 717 l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 718 break; 719 default: 720 break; 721 } 722 } 723 724 #ifdef ENABLE_BLE 725 btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 726 while (btstack_linked_list_iterator_has_next(&it)){ 727 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 728 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 729 switch (channel->state){ 730 case L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST: 731 if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 732 channel->state = L2CAP_STATE_WAIT_LE_CONNECTION_RESPONSE; 733 // le psm, source cid, mtu, mps, initial credits 734 l2cap_send_le_signaling_packet( channel->con_handle, LE_CREDIT_BASED_CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid, 23, 23, 1); 735 break; 736 default: 737 break; 738 } 739 } 740 741 // send l2cap con paramter update if necessary 742 hci_connections_get_iterator(&it); 743 while(btstack_linked_list_iterator_has_next(&it)){ 744 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 745 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 746 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 747 switch (connection->le_con_parameter_update_state){ 748 case CON_PARAMETER_UPDATE_SEND_REQUEST: 749 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 750 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 751 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 752 break; 753 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 754 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 755 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 756 break; 757 case CON_PARAMETER_UPDATE_DENY: 758 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 759 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 760 break; 761 default: 762 break; 763 } 764 #if 0 765 void l2cap_le_run(void){ 766 for all channels 767 switch(state): 768 769 if outgoing transfer active 770 send next chunk 771 if done, notify app 772 } 773 #endif 774 } 775 #endif 776 777 // log_info("l2cap_run: exit"); 778 } 779 780 uint16_t l2cap_max_mtu(void){ 781 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 782 } 783 784 uint16_t l2cap_max_le_mtu(void){ 785 return l2cap_max_mtu(); 786 } 787 788 static void l2cap_handle_connection_complete(hci_con_handle_t con_handle, l2cap_channel_t * channel){ 789 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 790 log_info("l2cap_handle_connection_complete expected state"); 791 // success, start l2cap handshake 792 channel->con_handle = con_handle; 793 // check remote SSP feature first 794 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 795 } 796 } 797 798 #ifdef ENABLE_BLE 799 static void l2cap_handle_le_connection_complete(l2cap_channel_t * channel, uint8_t status, hci_con_handle_t con_handle){ 800 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 801 log_info("l2cap_le_handle_connection_complete expected state"); 802 // TODO: bail if status != 0 803 804 // success, start l2cap handshake 805 channel->con_handle = con_handle; 806 channel->state = L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST; 807 } 808 } 809 #endif 810 811 812 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 813 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 814 815 // we have been waiting for remote supported features, if both support SSP, 816 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)); 817 if (gap_ssp_supported_on_both_sides(channel->con_handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 818 // request security level 2 819 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 820 gap_request_security_level(channel->con_handle, LEVEL_2); 821 return; 822 } 823 // fine, go ahead 824 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 825 } 826 827 static l2cap_channel_t * l2cap_create_channel_entry(btstack_packet_handler_t packet_handler, bd_addr_t address, bd_addr_type_t address_type, 828 uint16_t psm, uint16_t local_mtu, gap_security_level_t security_level){ 829 830 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 831 if (!channel) { 832 return NULL; 833 } 834 835 // Init memory (make valgrind happy) 836 memset(channel, 0, sizeof(l2cap_channel_t)); 837 838 // fill in 839 channel->packet_handler = packet_handler; 840 bd_addr_copy(channel->address, address); 841 channel->address_type = address_type; 842 channel->psm = psm; 843 channel->local_mtu = local_mtu; 844 channel->remote_mtu = L2CAP_MINIMAL_MTU; 845 channel->required_security_level = security_level; 846 847 // 848 channel->local_cid = l2cap_next_local_cid(); 849 channel->con_handle = 0; 850 851 // set initial state 852 channel->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 853 channel->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 854 channel->remote_sig_id = L2CAP_SIG_ID_INVALID; 855 channel->local_sig_id = L2CAP_SIG_ID_INVALID; 856 return channel; 857 } 858 859 /** 860 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 861 * @param packet_handler 862 * @param address 863 * @param psm 864 * @param mtu 865 * @param local_cid 866 */ 867 868 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){ 869 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, local_mtu); 870 871 if (local_mtu > l2cap_max_mtu()) { 872 local_mtu = l2cap_max_mtu(); 873 } 874 875 l2cap_channel_t * channel = l2cap_create_channel_entry(channel_packet_handler, address, BD_ADDR_TYPE_CLASSIC, psm, local_mtu, LEVEL_0); 876 if (!channel) { 877 return BTSTACK_MEMORY_ALLOC_FAILED; 878 } 879 880 // add to connections list 881 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 882 883 // store local_cid 884 if (out_local_cid){ 885 *out_local_cid = channel->local_cid; 886 } 887 888 // check if hci connection is already usable 889 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 890 if (conn){ 891 log_info("l2cap_create_channel, hci connection already exists"); 892 l2cap_handle_connection_complete(conn->con_handle, channel); 893 // check if remote supported fearures are already received 894 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 895 l2cap_handle_remote_supported_features_received(channel); 896 } 897 } 898 899 l2cap_run(); 900 901 return 0; 902 } 903 904 void 905 l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 906 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 907 // find channel for local_cid 908 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 909 if (channel) { 910 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 911 } 912 // process 913 l2cap_run(); 914 } 915 916 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 917 btstack_linked_list_iterator_t it; 918 btstack_linked_list_iterator_init(&it, &l2cap_channels); 919 while (btstack_linked_list_iterator_has_next(&it)){ 920 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 921 if ( bd_addr_cmp( channel->address, address) != 0) continue; 922 // channel for this address found 923 switch (channel->state){ 924 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 925 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 926 // failure, forward error code 927 l2cap_emit_channel_opened(channel, status); 928 // discard channel 929 l2cap_stop_rtx(channel); 930 btstack_linked_list_iterator_remove(&it); 931 btstack_memory_l2cap_channel_free(channel); 932 break; 933 default: 934 break; 935 } 936 } 937 } 938 939 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 940 btstack_linked_list_iterator_t it; 941 btstack_linked_list_iterator_init(&it, &l2cap_channels); 942 while (btstack_linked_list_iterator_has_next(&it)){ 943 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 944 if ( ! bd_addr_cmp( channel->address, address) ){ 945 l2cap_handle_connection_complete(handle, channel); 946 } 947 } 948 // process 949 l2cap_run(); 950 } 951 952 static void l2cap_notify_channel_can_send(void){ 953 btstack_linked_list_iterator_t it; 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->waiting_for_can_send_now) continue; 958 if (!hci_can_send_acl_packet_now(channel->con_handle)) continue; 959 channel->waiting_for_can_send_now = 0; 960 l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 961 } 962 963 int i; 964 for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 965 if (!fixed_channels[i].callback) continue; 966 if (!fixed_channels[i].waiting_for_can_send_now) continue; 967 int can_send; 968 if (l2cap_fixed_channel_table_index_is_le(i)){ 969 can_send = hci_can_send_acl_le_packet_now(); 970 } else { 971 can_send = hci_can_send_acl_classic_packet_now(); 972 } 973 if (!can_send) continue; 974 fixed_channels[i].waiting_for_can_send_now = 0; 975 l2cap_emit_can_send_now(fixed_channels[i].callback, l2cap_fixed_channel_table_channel_id_for_index(i)); 976 } 977 } 978 979 static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 980 981 bd_addr_t address; 982 hci_con_handle_t handle; 983 btstack_linked_list_iterator_t it; 984 int hci_con_used; 985 986 switch(hci_event_packet_get_type(packet)){ 987 988 // handle connection complete events 989 case HCI_EVENT_CONNECTION_COMPLETE: 990 reverse_bd_addr(&packet[5], address); 991 if (packet[2] == 0){ 992 handle = little_endian_read_16(packet, 3); 993 l2cap_handle_connection_success_for_addr(address, handle); 994 } else { 995 l2cap_handle_connection_failed_for_addr(address, packet[2]); 996 } 997 break; 998 999 // handle successful create connection cancel command 1000 case HCI_EVENT_COMMAND_COMPLETE: 1001 if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_create_connection_cancel)) { 1002 if (packet[5] == 0){ 1003 reverse_bd_addr(&packet[6], address); 1004 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 1005 l2cap_handle_connection_failed_for_addr(address, 0x16); 1006 } 1007 } 1008 l2cap_run(); // try sending signaling packets first 1009 break; 1010 1011 case HCI_EVENT_COMMAND_STATUS: 1012 l2cap_run(); // try sending signaling packets first 1013 break; 1014 1015 // handle disconnection complete events 1016 case HCI_EVENT_DISCONNECTION_COMPLETE: 1017 // send l2cap disconnect events for all channels on this handle and free them 1018 handle = little_endian_read_16(packet, 3); 1019 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1020 while (btstack_linked_list_iterator_has_next(&it)){ 1021 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1022 if (channel->con_handle != handle) continue; 1023 l2cap_emit_channel_closed(channel); 1024 l2cap_stop_rtx(channel); 1025 btstack_linked_list_iterator_remove(&it); 1026 btstack_memory_l2cap_channel_free(channel); 1027 } 1028 break; 1029 1030 // Notify channel packet handler if they can send now 1031 case HCI_EVENT_TRANSPORT_PACKET_SENT: 1032 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 1033 l2cap_run(); // try sending signaling packets first 1034 l2cap_notify_channel_can_send(); 1035 break; 1036 1037 // HCI Connection Timeouts 1038 case L2CAP_EVENT_TIMEOUT_CHECK: 1039 handle = little_endian_read_16(packet, 2); 1040 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 1041 if (hci_authentication_active_for_handle(handle)) break; 1042 hci_con_used = 0; 1043 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1044 while (btstack_linked_list_iterator_has_next(&it)){ 1045 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1046 if (channel->con_handle != handle) continue; 1047 hci_con_used = 1; 1048 break; 1049 } 1050 if (hci_con_used) break; 1051 if (!hci_can_send_command_packet_now()) break; 1052 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 1053 break; 1054 1055 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1056 handle = little_endian_read_16(packet, 3); 1057 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1058 while (btstack_linked_list_iterator_has_next(&it)){ 1059 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1060 if (channel->con_handle != handle) continue; 1061 l2cap_handle_remote_supported_features_received(channel); 1062 break; 1063 } 1064 break; 1065 1066 #ifdef ENABLE_BLE 1067 case HCI_EVENT_LE_META: 1068 switch (packet[2]){ 1069 int addr_type; 1070 l2cap_channel_t * channel; 1071 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1072 // Connection management 1073 reverse_bd_addr(&packet[8], address); 1074 addr_type = (bd_addr_type_t)packet[7]; 1075 log_info("L2CAP - LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(address)); 1076 // get l2cap_channel 1077 // also pass in status 1078 channel = l2cap_get_le_channel_for_address_and_addr_type(address, addr_type); 1079 if (!channel) break; 1080 l2cap_handle_le_connection_complete(channel, packet[3], little_endian_read_16(packet, 4)); 1081 break; 1082 default: 1083 break; 1084 } 1085 break; 1086 #endif 1087 1088 case GAP_EVENT_SECURITY_LEVEL: 1089 handle = little_endian_read_16(packet, 2); 1090 log_info("l2cap - security level update"); 1091 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1092 while (btstack_linked_list_iterator_has_next(&it)){ 1093 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1094 if (channel->con_handle != handle) continue; 1095 1096 log_info("l2cap - state %u", channel->state); 1097 1098 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 1099 gap_security_level_t required_level = channel->required_security_level; 1100 1101 switch (channel->state){ 1102 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 1103 if (actual_level >= required_level){ 1104 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1105 l2cap_emit_connection_request(channel); 1106 } else { 1107 channel->reason = 0x0003; // security block 1108 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1109 } 1110 break; 1111 1112 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1113 if (actual_level >= required_level){ 1114 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1115 } else { 1116 // disconnnect, authentication not good enough 1117 hci_disconnect_security_block(handle); 1118 } 1119 break; 1120 1121 default: 1122 break; 1123 } 1124 } 1125 break; 1126 1127 default: 1128 break; 1129 } 1130 1131 l2cap_run(); 1132 } 1133 1134 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1135 channel->remote_sig_id = identifier; 1136 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1137 l2cap_run(); 1138 } 1139 1140 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1141 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1142 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1143 signaling_responses[signaling_responses_pending].handle = handle; 1144 signaling_responses[signaling_responses_pending].code = code; 1145 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1146 signaling_responses[signaling_responses_pending].data = data; 1147 signaling_responses_pending++; 1148 l2cap_run(); 1149 } 1150 } 1151 1152 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1153 1154 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1155 l2cap_service_t *service = l2cap_get_service(psm); 1156 if (!service) { 1157 // 0x0002 PSM not supported 1158 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1159 return; 1160 } 1161 1162 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1163 if (!hci_connection) { 1164 // 1165 log_error("no hci_connection for handle %u", handle); 1166 return; 1167 } 1168 1169 // alloc structure 1170 // log_info("l2cap_handle_connection_request register channel"); 1171 l2cap_channel_t * channel = l2cap_create_channel_entry(service->packet_handler, hci_connection->address, BD_ADDR_TYPE_CLASSIC, 1172 psm, service->mtu, service->required_security_level); 1173 if (!channel){ 1174 // 0x0004 No resources available 1175 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1176 return; 1177 } 1178 1179 channel->con_handle = handle; 1180 channel->remote_cid = source_cid; 1181 channel->remote_sig_id = sig_id; 1182 1183 // limit local mtu to max acl packet length - l2cap header 1184 if (channel->local_mtu > l2cap_max_mtu()) { 1185 channel->local_mtu = l2cap_max_mtu(); 1186 } 1187 1188 // set initial state 1189 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1190 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1191 1192 // add to connections list 1193 btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1194 1195 // assert security requirements 1196 gap_request_security_level(handle, channel->required_security_level); 1197 } 1198 1199 void l2cap_accept_connection(uint16_t local_cid){ 1200 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1201 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1202 if (!channel) { 1203 log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1204 return; 1205 } 1206 1207 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1208 1209 // process 1210 l2cap_run(); 1211 } 1212 1213 void l2cap_decline_connection(uint16_t local_cid){ 1214 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x", local_cid); 1215 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1216 if (!channel) { 1217 log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1218 return; 1219 } 1220 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1221 channel->reason = 0x04; // no resources available 1222 l2cap_run(); 1223 } 1224 1225 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1226 1227 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1228 1229 uint16_t flags = little_endian_read_16(command, 6); 1230 if (flags & 1) { 1231 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1232 } 1233 1234 // accept the other's configuration options 1235 uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1236 uint16_t pos = 8; 1237 while (pos < end_pos){ 1238 uint8_t option_hint = command[pos] >> 7; 1239 uint8_t option_type = command[pos] & 0x7f; 1240 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1241 pos++; 1242 uint8_t length = command[pos++]; 1243 // MTU { type(8): 1, len(8):2, MTU(16) } 1244 if (option_type == 1 && length == 2){ 1245 channel->remote_mtu = little_endian_read_16(command, pos); 1246 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1247 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1248 } 1249 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1250 if (option_type == 2 && length == 2){ 1251 channel->flush_timeout = little_endian_read_16(command, pos); 1252 } 1253 // check for unknown options 1254 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1255 log_info("l2cap cid %u, unknown options", channel->local_cid); 1256 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1257 } 1258 pos += length; 1259 } 1260 } 1261 1262 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1263 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1264 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1265 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1266 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1267 if (channel->state == L2CAP_STATE_OPEN) return 0; 1268 return 1; 1269 } 1270 1271 1272 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1273 1274 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1275 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1276 uint16_t result = 0; 1277 1278 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1279 1280 // handle DISCONNECT REQUESTS seperately 1281 if (code == DISCONNECTION_REQUEST){ 1282 switch (channel->state){ 1283 case L2CAP_STATE_CONFIG: 1284 case L2CAP_STATE_OPEN: 1285 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1286 case L2CAP_STATE_WAIT_DISCONNECT: 1287 l2cap_handle_disconnect_request(channel, identifier); 1288 break; 1289 1290 default: 1291 // ignore in other states 1292 break; 1293 } 1294 return; 1295 } 1296 1297 // @STATEMACHINE(l2cap) 1298 switch (channel->state) { 1299 1300 case L2CAP_STATE_WAIT_CONNECT_RSP: 1301 switch (code){ 1302 case CONNECTION_RESPONSE: 1303 l2cap_stop_rtx(channel); 1304 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1305 switch (result) { 1306 case 0: 1307 // successful connection 1308 channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1309 channel->state = L2CAP_STATE_CONFIG; 1310 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1311 break; 1312 case 1: 1313 // connection pending. get some coffee, but start the ERTX 1314 l2cap_start_ertx(channel); 1315 break; 1316 default: 1317 // channel closed 1318 channel->state = L2CAP_STATE_CLOSED; 1319 // map l2cap connection response result to BTstack status enumeration 1320 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1321 1322 // drop link key if security block 1323 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1324 gap_drop_link_key_for_bd_addr(channel->address); 1325 } 1326 1327 // discard channel 1328 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1329 btstack_memory_l2cap_channel_free(channel); 1330 break; 1331 } 1332 break; 1333 1334 default: 1335 //@TODO: implement other signaling packets 1336 break; 1337 } 1338 break; 1339 1340 case L2CAP_STATE_CONFIG: 1341 result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1342 switch (code) { 1343 case CONFIGURE_REQUEST: 1344 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1345 l2cap_signaling_handle_configure_request(channel, command); 1346 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1347 // only done if continuation not set 1348 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1349 } 1350 break; 1351 case CONFIGURE_RESPONSE: 1352 l2cap_stop_rtx(channel); 1353 switch (result){ 1354 case 0: // success 1355 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1356 break; 1357 case 4: // pending 1358 l2cap_start_ertx(channel); 1359 break; 1360 default: 1361 // retry on negative result 1362 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1363 break; 1364 } 1365 break; 1366 default: 1367 break; 1368 } 1369 if (l2cap_channel_ready_for_open(channel)){ 1370 // for open: 1371 channel->state = L2CAP_STATE_OPEN; 1372 l2cap_emit_channel_opened(channel, 0); 1373 } 1374 break; 1375 1376 case L2CAP_STATE_WAIT_DISCONNECT: 1377 switch (code) { 1378 case DISCONNECTION_RESPONSE: 1379 l2cap_finialize_channel_close(channel); 1380 break; 1381 default: 1382 //@TODO: implement other signaling packets 1383 break; 1384 } 1385 break; 1386 1387 case L2CAP_STATE_CLOSED: 1388 // @TODO handle incoming requests 1389 break; 1390 1391 case L2CAP_STATE_OPEN: 1392 //@TODO: implement other signaling packets, e.g. re-configure 1393 break; 1394 default: 1395 break; 1396 } 1397 // log_info("new state %u", channel->state); 1398 } 1399 1400 1401 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1402 1403 // get code, signalind identifier and command len 1404 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1405 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1406 1407 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1408 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1409 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1410 return; 1411 } 1412 1413 // general commands without an assigned channel 1414 switch(code) { 1415 1416 case CONNECTION_REQUEST: { 1417 uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1418 uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1419 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1420 return; 1421 } 1422 1423 case ECHO_REQUEST: 1424 l2cap_register_signaling_response(handle, code, sig_id, 0); 1425 return; 1426 1427 case INFORMATION_REQUEST: { 1428 uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1429 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1430 return; 1431 } 1432 1433 default: 1434 break; 1435 } 1436 1437 1438 // Get potential destination CID 1439 uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1440 1441 // Find channel for this sig_id and connection handle 1442 btstack_linked_list_iterator_t it; 1443 btstack_linked_list_iterator_init(&it, &l2cap_channels); 1444 while (btstack_linked_list_iterator_has_next(&it)){ 1445 l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1446 if (channel->con_handle != handle) continue; 1447 if (code & 1) { 1448 // match odd commands (responses) by previous signaling identifier 1449 if (channel->local_sig_id == sig_id) { 1450 l2cap_signaling_handler_channel(channel, command); 1451 break; 1452 } 1453 } else { 1454 // match even commands (requests) by local channel id 1455 if (channel->local_cid == dest_cid) { 1456 l2cap_signaling_handler_channel(channel, command); 1457 break; 1458 } 1459 } 1460 } 1461 } 1462 1463 // @returns valid 1464 static int l2cap_le_signaling_handler_dispatch(hci_con_handle_t handle, uint8_t * command, uint8_t sig_id){ 1465 uint16_t result; 1466 uint8_t event[10]; 1467 1468 switch (command[0]){ 1469 1470 case CONNECTION_PARAMETER_UPDATE_RESPONSE: 1471 result = little_endian_read_16(command, 4); 1472 l2cap_emit_connection_parameter_update_response(handle, result); 1473 break; 1474 1475 case CONNECTION_PARAMETER_UPDATE_REQUEST: 1476 hci_connection_t * connection = hci_connection_for_handle(handle); 1477 if (connection){ 1478 if (connection->role != HCI_ROLE_MASTER){ 1479 // reject command without notifying upper layer when not in master role 1480 return 0; 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(command,8); 1486 uint16_t le_conn_interval_max = little_endian_read_16(command,10); 1487 uint16_t le_conn_latency = little_endian_read_16(command,12); 1488 uint16_t le_supervision_timeout = little_endian_read_16(command,14); 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 = sig_id; 1509 } 1510 1511 if (!l2cap_event_packet_handler) break; 1512 1513 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1514 event[1] = 8; 1515 memcpy(&event[2], &command[4], 8); 1516 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1517 (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1518 break; 1519 1520 default: 1521 // command unknown -> reject command 1522 return 0; 1523 } 1524 return 1; 1525 } 1526 1527 static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ){ 1528 1529 // Get Channel ID 1530 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1531 uint8_t sig_id; 1532 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1533 int valid; 1534 1535 switch (channel_id) { 1536 1537 case L2CAP_CID_SIGNALING: { 1538 uint16_t command_offset = 8; 1539 while (command_offset < size) { 1540 1541 // handle signaling commands 1542 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1543 1544 // increment command_offset 1545 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1546 } 1547 break; 1548 } 1549 1550 case L2CAP_CID_SIGNALING_LE: 1551 sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1552 valid = l2cap_le_signaling_handler_dispatch(handle, &packet[COMPLETE_L2CAP_HEADER], sig_id); 1553 if (!valid){ 1554 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1555 } 1556 break; 1557 1558 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1559 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1560 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1561 } 1562 break; 1563 1564 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1565 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1566 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1567 } 1568 break; 1569 1570 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1571 if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1572 (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1573 } 1574 break; 1575 1576 default: { 1577 // Find channel for this channel_id and connection handle 1578 l2cap_channel_t * l2cap_channel = l2cap_get_channel_for_local_cid(channel_id); 1579 if (l2cap_channel) { 1580 l2cap_dispatch_to_channel(l2cap_channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1581 } 1582 break; 1583 } 1584 } 1585 1586 l2cap_run(); 1587 } 1588 1589 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1590 void l2cap_finialize_channel_close(l2cap_channel_t * channel){ 1591 channel->state = L2CAP_STATE_CLOSED; 1592 l2cap_emit_channel_closed(channel); 1593 // discard channel 1594 l2cap_stop_rtx(channel); 1595 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1596 btstack_memory_l2cap_channel_free(channel); 1597 } 1598 1599 static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1600 btstack_linked_list_iterator_t it; 1601 btstack_linked_list_iterator_init(&it, services); 1602 while (btstack_linked_list_iterator_has_next(&it)){ 1603 l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 1604 if ( service->psm == psm){ 1605 return service; 1606 }; 1607 } 1608 return NULL; 1609 } 1610 1611 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1612 return l2cap_get_service_internal(&l2cap_services, psm); 1613 } 1614 1615 1616 uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1617 1618 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1619 1620 // check for alread registered psm 1621 l2cap_service_t *service = l2cap_get_service(psm); 1622 if (service) { 1623 log_error("l2cap_register_service: PSM %u already registered", psm); 1624 return L2CAP_SERVICE_ALREADY_REGISTERED; 1625 } 1626 1627 // alloc structure 1628 service = btstack_memory_l2cap_service_get(); 1629 if (!service) { 1630 log_error("l2cap_register_service: no memory for l2cap_service_t"); 1631 return BTSTACK_MEMORY_ALLOC_FAILED; 1632 } 1633 1634 // fill in 1635 service->psm = psm; 1636 service->mtu = mtu; 1637 service->packet_handler = service_packet_handler; 1638 service->required_security_level = security_level; 1639 1640 // add to services list 1641 btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1642 1643 // enable page scan 1644 gap_connectable_control(1); 1645 1646 return 0; 1647 } 1648 1649 uint8_t l2cap_unregister_service(uint16_t psm){ 1650 1651 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1652 1653 l2cap_service_t *service = l2cap_get_service(psm); 1654 if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1655 btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1656 btstack_memory_l2cap_service_free(service); 1657 1658 // disable page scan when no services registered 1659 if (btstack_linked_list_empty(&l2cap_services)) { 1660 gap_connectable_control(0); 1661 } 1662 return 0; 1663 } 1664 1665 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1666 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1667 int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 1668 if (index < 0) return; 1669 fixed_channels[index].callback = the_packet_handler; 1670 } 1671 1672 #ifdef ENABLE_BLE 1673 1674 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1675 return l2cap_get_service_internal(&l2cap_le_services, psm); 1676 } 1677 1678 uint8_t l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, gap_security_level_t security_level){ 1679 1680 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x", psm); 1681 1682 // check for alread registered psm 1683 l2cap_service_t *service = l2cap_le_get_service(psm); 1684 if (service) { 1685 return L2CAP_SERVICE_ALREADY_REGISTERED; 1686 } 1687 1688 // alloc structure 1689 service = btstack_memory_l2cap_service_get(); 1690 if (!service) { 1691 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1692 return BTSTACK_MEMORY_ALLOC_FAILED; 1693 } 1694 1695 // fill in 1696 service->psm = psm; 1697 service->mtu = 0; 1698 service->packet_handler = packet_handler; 1699 service->required_security_level = security_level; 1700 1701 // add to services list 1702 btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 1703 1704 // done 1705 return 0; 1706 } 1707 1708 uint8_t l2cap_le_unregister_service(uint16_t psm) { 1709 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1710 l2cap_service_t *service = l2cap_le_get_service(psm); 1711 if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1712 1713 btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 1714 btstack_memory_l2cap_service_free(service); 1715 return 0; 1716 } 1717 1718 uint8_t l2cap_le_accept_connection(uint16_t local_cid, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits){ 1719 // get connection 1720 // bail if missing 1721 // set mtu and receive buffer 1722 // check state 1723 // set state accept connection 1724 // l2cap_le_run() 1725 return 0; 1726 } 1727 1728 /** 1729 * @brief Deny incoming LE Data Channel connection due to resource constraints 1730 * @param local_cid L2CAP LE Data Channel Identifier 1731 */ 1732 1733 uint8_t l2cap_le_decline_connection(uint16_t local_cid){ 1734 // get connection 1735 // bail if missing 1736 // check state 1737 // set state decline connection 1738 // l2cap_le_run() 1739 return 0; 1740 } 1741 1742 uint8_t l2cap_le_create_channel(btstack_packet_handler_t packet_handler, bd_addr_t address, bd_addr_type_t address_type, 1743 uint16_t psm, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits, gap_security_level_t security_level, 1744 uint16_t * out_local_cid) { 1745 1746 log_info("L2CAP_LE_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 1747 1748 l2cap_channel_t * channel = l2cap_create_channel_entry(packet_handler, address, address_type, psm, mtu, LEVEL_0); 1749 if (!channel) { 1750 return BTSTACK_MEMORY_ALLOC_FAILED; 1751 } 1752 1753 // store local_cid 1754 if (out_local_cid){ 1755 *out_local_cid = channel->local_cid; 1756 } 1757 1758 // add to connections list 1759 btstack_linked_list_add(&l2cap_le_channels, (btstack_linked_item_t *) channel); 1760 1761 // check if hci connection is already usable 1762 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, address_type); 1763 1764 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 1765 1766 if (conn){ 1767 log_info("l2cap_le_create_channel, hci connection already exists"); 1768 l2cap_handle_le_connection_complete(channel, 0, conn->con_handle); 1769 } else { 1770 1771 // 1772 // TODO: start timer 1773 // .. 1774 1775 // start connection 1776 uint8_t res = gap_auto_connection_start(address_type, address); 1777 if (res){ 1778 // discard channel object 1779 btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1780 btstack_memory_l2cap_channel_free(channel); 1781 return res; 1782 } 1783 } 1784 return 0; 1785 } 1786 1787 /** 1788 * @brief Provide credtis for LE Data Channel 1789 * @param local_cid L2CAP LE Data Channel Identifier 1790 * @param credits Number additional credits for peer 1791 */ 1792 uint8_t l2cap_le_provide_credits(uint16_t cid, uint16_t credits){ 1793 // get connection 1794 // bail if missing 1795 // check state 1796 // check incoming credits + credits <= 0xffff 1797 // set credits_granted 1798 // l2cap_le_run() 1799 return 0; 1800 } 1801 1802 /** 1803 * @brief Check if outgoing buffer is available and that there's space on the Bluetooth module 1804 * @param local_cid L2CAP LE Data Channel Identifier 1805 */ 1806 int l2cap_le_can_send_now(uint16_t cid){ 1807 // check if data can be sent via le at all 1808 return 0; 1809 } 1810 1811 /** 1812 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible 1813 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function 1814 * so packet handler should be ready to handle it 1815 * @param local_cid L2CAP LE Data Channel Identifier 1816 */ 1817 uint8_t l2cap_le_request_can_send_now_event(uint16_t cid){ 1818 // same as for non-le 1819 return 0; 1820 } 1821 1822 /** 1823 * @brief Send data via LE Data Channel 1824 * @note Since data larger then the maximum PDU needs to be segmented into multiple PDUs, data needs to stay valid until ... event 1825 * @param local_cid L2CAP LE Data Channel Identifier 1826 * @param data data to send 1827 * @param size data size 1828 */ 1829 uint8_t l2cap_le_send_data(uint16_t cid, uint8_t * data, uint16_t size){ 1830 // check if no outgoing data is pending 1831 // store info 1832 // l2cap_le_run() 1833 return 0; 1834 } 1835 1836 /** 1837 * @brief Disconnect from LE Data Channel 1838 * @param local_cid L2CAP LE Data Channel Identifier 1839 */ 1840 uint8_t l2cap_le_disconnect(uint16_t cid) 1841 { 1842 // find channel 1843 // check state 1844 // set state SEND_DISCONNECT 1845 return 0; 1846 } 1847 1848 #endif 1849