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 "debug.h" 50 #include "btstack_memory.h" 51 52 #include <stdarg.h> 53 #include <string.h> 54 55 #include <stdio.h> 56 57 // nr of buffered acl packets in outgoing queue to get max performance 58 #define NR_BUFFERED_ACL_PACKETS 3 59 60 // used to cache l2cap rejects, echo, and informational requests 61 #define NR_PENDING_SIGNALING_RESPONSES 3 62 63 // offsets for L2CAP SIGNALING COMMANDS 64 #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 65 #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 66 #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 67 #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 68 69 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 70 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 71 72 // used to cache l2cap rejects, echo, and informational requests 73 static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 74 static int signaling_responses_pending; 75 76 static linked_list_t l2cap_channels; 77 static linked_list_t l2cap_services; 78 static linked_list_t l2cap_le_channels; 79 static linked_list_t l2cap_le_services; 80 static void (*packet_handler) (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) = null_packet_handler; 81 static int new_credits_blocked = 0; 82 83 static btstack_packet_handler_t attribute_protocol_packet_handler; 84 static btstack_packet_handler_t security_protocol_packet_handler; 85 static btstack_packet_handler_t connectionless_channel_packet_handler; 86 static uint8_t require_security_level2_for_outgoing_sdp; 87 88 // prototypes 89 static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 90 static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 91 static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 92 static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 93 static void l2cap_emit_connection_request(l2cap_channel_t *channel); 94 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 95 96 97 void l2cap_init(void){ 98 new_credits_blocked = 0; 99 signaling_responses_pending = 0; 100 101 l2cap_channels = NULL; 102 l2cap_services = NULL; 103 l2cap_le_services = NULL; 104 l2cap_le_channels = NULL; 105 106 packet_handler = null_packet_handler; 107 attribute_protocol_packet_handler = NULL; 108 security_protocol_packet_handler = NULL; 109 connectionless_channel_packet_handler = NULL; 110 111 require_security_level2_for_outgoing_sdp = 0; 112 113 // 114 // register callback with HCI 115 // 116 hci_register_packet_handler(&l2cap_packet_handler); 117 hci_connectable_control(0); // no services yet 118 } 119 120 121 /** Register L2CAP packet handlers */ 122 static void null_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 123 } 124 void l2cap_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 125 packet_handler = handler; 126 } 127 128 // notify client/protocol handler 129 static void l2cap_dispatch(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 130 if (channel->packet_handler) { 131 (* (channel->packet_handler))(type, channel->local_cid, data, size); 132 } else { 133 (*packet_handler)(channel->connection, type, channel->local_cid, data, size); 134 } 135 } 136 137 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 138 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", 139 status, bd_addr_to_str(channel->address), channel->handle, channel->psm, 140 channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 141 uint8_t event[23]; 142 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 143 event[1] = sizeof(event) - 2; 144 event[2] = status; 145 bt_flip_addr(&event[3], channel->address); 146 bt_store_16(event, 9, channel->handle); 147 bt_store_16(event, 11, channel->psm); 148 bt_store_16(event, 13, channel->local_cid); 149 bt_store_16(event, 15, channel->remote_cid); 150 bt_store_16(event, 17, channel->local_mtu); 151 bt_store_16(event, 19, channel->remote_mtu); 152 bt_store_16(event, 21, channel->flush_timeout); 153 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 154 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 155 } 156 157 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 158 log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 159 uint8_t event[4]; 160 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 161 event[1] = sizeof(event) - 2; 162 bt_store_16(event, 2, channel->local_cid); 163 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 164 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 165 } 166 167 void l2cap_emit_connection_request(l2cap_channel_t *channel) { 168 log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 169 bd_addr_to_str(channel->address), channel->handle, channel->psm, channel->local_cid, channel->remote_cid); 170 uint8_t event[16]; 171 event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 172 event[1] = sizeof(event) - 2; 173 bt_flip_addr(&event[2], channel->address); 174 bt_store_16(event, 8, channel->handle); 175 bt_store_16(event, 10, channel->psm); 176 bt_store_16(event, 12, channel->local_cid); 177 bt_store_16(event, 14, channel->remote_cid); 178 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 179 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 180 } 181 182 static void l2cap_emit_connection_parameter_update_response(uint16_t handle, uint16_t result){ 183 uint8_t event[6]; 184 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 185 event[1] = 4; 186 bt_store_16(event, 2, handle); 187 bt_store_16(event, 4, result); 188 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 189 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 190 } 191 192 static void l2cap_emit_service_registered(void *connection, uint8_t status, uint16_t psm){ 193 log_info("L2CAP_EVENT_SERVICE_REGISTERED status 0x%x psm 0x%x", status, psm); 194 uint8_t event[5]; 195 event[0] = L2CAP_EVENT_SERVICE_REGISTERED; 196 event[1] = sizeof(event) - 2; 197 event[2] = status; 198 bt_store_16(event, 3, psm); 199 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 200 (*packet_handler)(connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 201 } 202 203 static void l2cap_emit_credits(l2cap_channel_t *channel, uint8_t credits) { 204 205 log_info("L2CAP_EVENT_CREDITS local_cid 0x%x credits %u", channel->local_cid, credits); 206 // track credits 207 channel->packets_granted += credits; 208 209 uint8_t event[5]; 210 event[0] = L2CAP_EVENT_CREDITS; 211 event[1] = sizeof(event) - 2; 212 bt_store_16(event, 2, channel->local_cid); 213 event[4] = credits; 214 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 215 l2cap_dispatch(channel, HCI_EVENT_PACKET, event, sizeof(event)); 216 } 217 218 void l2cap_block_new_credits(uint8_t blocked){ 219 new_credits_blocked = blocked; 220 } 221 222 static void l2cap_hand_out_credits(void){ 223 224 if (new_credits_blocked) return; // we're told not to. used by daemon 225 226 linked_list_iterator_t it; 227 linked_list_iterator_init(&it, &l2cap_channels); 228 while (linked_list_iterator_has_next(&it)){ 229 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 230 if (channel->state != L2CAP_STATE_OPEN) continue; 231 if (!hci_number_free_acl_slots_for_handle(channel->handle)) return; 232 if (hci_number_outgoing_packets(channel->handle) < NR_BUFFERED_ACL_PACKETS && channel->packets_granted == 0) { 233 l2cap_emit_credits(channel, 1); 234 } 235 } 236 } 237 238 static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 239 linked_list_iterator_t it; 240 linked_list_iterator_init(&it, &l2cap_channels); 241 while (linked_list_iterator_has_next(&it)){ 242 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 243 if ( channel->local_cid == local_cid) { 244 return channel; 245 } 246 } 247 return NULL; 248 } 249 250 int l2cap_can_send_packet_now(uint16_t local_cid){ 251 l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 252 if (!channel) return 0; 253 if (!channel->packets_granted) return 0; 254 return hci_can_send_acl_packet_now(channel->handle); 255 } 256 257 // @deprecated 258 int l2cap_can_send_connectionless_packet_now(void){ 259 // TODO provide real handle 260 return l2cap_can_send_fixed_channel_packet_now(0x1234); 261 } 262 263 int l2cap_can_send_fixed_channel_packet_now(uint16_t handle){ 264 return hci_can_send_acl_packet_now(handle); 265 } 266 267 uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 268 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 269 if (channel) { 270 return channel->remote_mtu; 271 } 272 return 0; 273 } 274 275 static l2cap_channel_t * l2cap_channel_for_rtx_timer(timer_source_t * ts){ 276 linked_list_iterator_t it; 277 linked_list_iterator_init(&it, &l2cap_channels); 278 while (linked_list_iterator_has_next(&it)){ 279 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 280 if ( &channel->rtx == ts) { 281 return channel; 282 } 283 } 284 return NULL; 285 } 286 287 static void l2cap_rtx_timeout(timer_source_t * ts){ 288 l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 289 if (!ts) return; 290 291 log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 292 293 // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 294 // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 295 // notify client 296 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 297 298 // discard channel 299 // no need to stop timer here, it is removed from list during timer callback 300 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 301 btstack_memory_l2cap_channel_free(channel); 302 } 303 304 static void l2cap_stop_rtx(l2cap_channel_t * channel){ 305 log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 306 run_loop_remove_timer(&channel->rtx); 307 } 308 309 static void l2cap_start_rtx(l2cap_channel_t * channel){ 310 l2cap_stop_rtx(channel); 311 log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 312 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 313 run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 314 run_loop_add_timer(&channel->rtx); 315 } 316 317 static void l2cap_start_ertx(l2cap_channel_t * channel){ 318 log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 319 l2cap_stop_rtx(channel); 320 run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 321 run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 322 run_loop_add_timer(&channel->rtx); 323 } 324 325 void l2cap_require_security_level_2_for_outgoing_sdp(void){ 326 require_security_level2_for_outgoing_sdp = 1; 327 } 328 329 static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 330 return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 331 } 332 333 static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 334 335 if (!hci_can_send_acl_packet_now(handle)){ 336 log_info("l2cap_send_signaling_packet, cannot send"); 337 return BTSTACK_ACL_BUFFERS_FULL; 338 } 339 340 // log_info("l2cap_send_signaling_packet type %u", cmd); 341 hci_reserve_packet_buffer(); 342 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 343 va_list argptr; 344 va_start(argptr, identifier); 345 uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 346 va_end(argptr); 347 // log_info("l2cap_send_signaling_packet con %u!", handle); 348 return hci_send_acl_packet_buffer(len); 349 } 350 351 #ifdef HAVE_BLE 352 static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 353 354 if (!hci_can_send_acl_packet_now(handle)){ 355 log_info("l2cap_send_signaling_packet, cannot send"); 356 return BTSTACK_ACL_BUFFERS_FULL; 357 } 358 359 // log_info("l2cap_send_signaling_packet type %u", cmd); 360 hci_reserve_packet_buffer(); 361 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 362 va_list argptr; 363 va_start(argptr, identifier); 364 uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 365 va_end(argptr); 366 // log_info("l2cap_send_signaling_packet con %u!", handle); 367 return hci_send_acl_packet_buffer(len); 368 } 369 #endif 370 371 uint8_t *l2cap_get_outgoing_buffer(void){ 372 return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 373 } 374 375 int l2cap_reserve_packet_buffer(void){ 376 return hci_reserve_packet_buffer(); 377 } 378 379 void l2cap_release_packet_buffer(void){ 380 hci_release_packet_buffer(); 381 } 382 383 384 int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 385 386 if (!hci_is_packet_buffer_reserved()){ 387 log_error("l2cap_send_prepared called without reserving packet first"); 388 return BTSTACK_ACL_BUFFERS_FULL; 389 } 390 391 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 392 if (!channel) { 393 log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 394 return -1; // TODO: define error 395 } 396 397 if (channel->packets_granted == 0){ 398 log_error("l2cap_send_prepared cid 0x%02x, no credits!", local_cid); 399 return -1; // TODO: define error 400 } 401 402 if (!hci_can_send_prepared_acl_packet_now(channel->handle)){ 403 log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 404 return BTSTACK_ACL_BUFFERS_FULL; 405 } 406 407 --channel->packets_granted; 408 409 log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used, credits left %u;", 410 local_cid, channel->handle, channel->packets_granted); 411 412 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 413 414 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 415 416 // 0 - Connection handle : PB=pb : BC=00 417 bt_store_16(acl_buffer, 0, channel->handle | (pb << 12) | (0 << 14)); 418 // 2 - ACL length 419 bt_store_16(acl_buffer, 2, len + 4); 420 // 4 - L2CAP packet length 421 bt_store_16(acl_buffer, 4, len + 0); 422 // 6 - L2CAP channel DEST 423 bt_store_16(acl_buffer, 6, channel->remote_cid); 424 // send 425 int err = hci_send_acl_packet_buffer(len+8); 426 427 l2cap_hand_out_credits(); 428 429 return err; 430 } 431 432 int l2cap_send_prepared_connectionless(uint16_t handle, uint16_t cid, uint16_t len){ 433 434 if (!hci_is_packet_buffer_reserved()){ 435 log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 436 return BTSTACK_ACL_BUFFERS_FULL; 437 } 438 439 if (!hci_can_send_prepared_acl_packet_now(handle)){ 440 log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", handle, cid); 441 return BTSTACK_ACL_BUFFERS_FULL; 442 } 443 444 log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", handle, cid); 445 446 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 447 448 int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 449 450 // 0 - Connection handle : PB=pb : BC=00 451 bt_store_16(acl_buffer, 0, handle | (pb << 12) | (0 << 14)); 452 // 2 - ACL length 453 bt_store_16(acl_buffer, 2, len + 4); 454 // 4 - L2CAP packet length 455 bt_store_16(acl_buffer, 4, len + 0); 456 // 6 - L2CAP channel DEST 457 bt_store_16(acl_buffer, 6, cid); 458 // send 459 int err = hci_send_acl_packet_buffer(len+8); 460 461 l2cap_hand_out_credits(); 462 463 return err; 464 } 465 466 int l2cap_send_internal(uint16_t local_cid, uint8_t *data, uint16_t len){ 467 468 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 469 if (!channel) { 470 log_error("l2cap_send_internal no channel for cid 0x%02x", local_cid); 471 return -1; // TODO: define error 472 } 473 474 if (len > channel->remote_mtu){ 475 log_error("l2cap_send_internal cid 0x%02x, data length exceeds remote MTU.", local_cid); 476 return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 477 } 478 479 if (!hci_can_send_acl_packet_now(channel->handle)){ 480 log_info("l2cap_send_internal cid 0x%02x, cannot send", local_cid); 481 return BTSTACK_ACL_BUFFERS_FULL; 482 } 483 484 hci_reserve_packet_buffer(); 485 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 486 487 memcpy(&acl_buffer[8], data, len); 488 489 return l2cap_send_prepared(local_cid, len); 490 } 491 492 int l2cap_send_connectionless(uint16_t handle, uint16_t cid, uint8_t *data, uint16_t len){ 493 494 if (!hci_can_send_acl_packet_now(handle)){ 495 log_info("l2cap_send_internal cid 0x%02x, cannot send", cid); 496 return BTSTACK_ACL_BUFFERS_FULL; 497 } 498 499 hci_reserve_packet_buffer(); 500 uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 501 502 memcpy(&acl_buffer[8], data, len); 503 504 return l2cap_send_prepared_connectionless(handle, cid, len); 505 } 506 507 int l2cap_send_echo_request(uint16_t handle, uint8_t *data, uint16_t len){ 508 return l2cap_send_signaling_packet(handle, ECHO_REQUEST, 0x77, len, data); 509 } 510 511 static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 512 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 513 } 514 515 static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 516 channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 517 } 518 519 520 521 // MARK: L2CAP_RUN 522 // process outstanding signaling tasks 523 static void l2cap_run(void){ 524 525 // log_info("l2cap_run: entered"); 526 527 // check pending signaling responses 528 while (signaling_responses_pending){ 529 530 hci_con_handle_t handle = signaling_responses[0].handle; 531 532 if (!hci_can_send_acl_packet_now(handle)) break; 533 534 uint8_t sig_id = signaling_responses[0].sig_id; 535 uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 536 uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 537 uint8_t response_code = signaling_responses[0].code; 538 539 // remove first item before sending (to avoid sending response mutliple times) 540 signaling_responses_pending--; 541 int i; 542 for (i=0; i < signaling_responses_pending; i++){ 543 memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 544 } 545 546 switch (response_code){ 547 case CONNECTION_REQUEST: 548 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 549 // also disconnect if result is 0x0003 - security blocked 550 if (result == 0x0003){ 551 hci_disconnect_security_block(handle); 552 } 553 break; 554 case ECHO_REQUEST: 555 l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 556 break; 557 case INFORMATION_REQUEST: 558 switch (infoType){ 559 case 1: { // Connectionless MTU 560 uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 561 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 562 break; 563 } 564 case 2: { // Extended Features Supported 565 // extended features request supported, features: fixed channels, unicast connectionless data reception 566 uint32_t features = 0x280; 567 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 568 break; 569 } 570 case 3: { // Fixed Channels Supported 571 uint8_t map[8]; 572 memset(map, 0, 8); 573 map[0] = 0x01; // L2CAP Signaling Channel (0x01) + Connectionless reception (0x02) 574 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 575 break; 576 } 577 default: 578 // all other types are not supported 579 l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 580 break; 581 } 582 break; 583 case COMMAND_REJECT: 584 l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 585 #ifdef HAVE_BLE 586 case COMMAND_REJECT_LE: 587 l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 588 break; 589 #endif 590 default: 591 // should not happen 592 break; 593 } 594 } 595 596 uint8_t config_options[4]; 597 linked_list_iterator_t it; 598 linked_list_iterator_init(&it, &l2cap_channels); 599 while (linked_list_iterator_has_next(&it)){ 600 601 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 602 // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 603 switch (channel->state){ 604 605 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 606 case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 607 if (!hci_can_send_acl_packet_now(channel->handle)) break; 608 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 609 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 610 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 611 } 612 break; 613 614 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 615 if (!hci_can_send_command_packet_now()) break; 616 // send connection request - set state first 617 channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 618 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 619 hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 620 break; 621 622 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 623 if (!hci_can_send_acl_packet_now(channel->handle)) break; 624 channel->state = L2CAP_STATE_INVALID; 625 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 626 // discard channel - l2cap_finialize_channel_close without sending l2cap close event 627 l2cap_stop_rtx(channel); 628 linked_list_iterator_remove(&it); 629 btstack_memory_l2cap_channel_free(channel); 630 break; 631 632 case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 633 if (!hci_can_send_acl_packet_now(channel->handle)) break; 634 channel->state = L2CAP_STATE_CONFIG; 635 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 636 l2cap_send_signaling_packet(channel->handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 637 break; 638 639 case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 640 if (!hci_can_send_acl_packet_now(channel->handle)) break; 641 // success, start l2cap handshake 642 channel->local_sig_id = l2cap_next_sig_id(); 643 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 644 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 645 l2cap_start_rtx(channel); 646 break; 647 648 case L2CAP_STATE_CONFIG: 649 if (!hci_can_send_acl_packet_now(channel->handle)) break; 650 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 651 uint16_t flags = 0; 652 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 653 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 654 flags = 1; 655 } else { 656 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 657 } 658 if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 659 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 660 } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 661 config_options[0] = 1; // MTU 662 config_options[1] = 2; // len param 663 bt_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 664 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 665 channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 666 } else { 667 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 668 } 669 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 670 } 671 else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 672 channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 673 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 674 channel->local_sig_id = l2cap_next_sig_id(); 675 config_options[0] = 1; // MTU 676 config_options[1] = 2; // len param 677 bt_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 678 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 679 l2cap_start_rtx(channel); 680 } 681 if (l2cap_channel_ready_for_open(channel)){ 682 channel->state = L2CAP_STATE_OPEN; 683 l2cap_emit_channel_opened(channel, 0); // success 684 l2cap_emit_credits(channel, 1); 685 } 686 break; 687 688 case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 689 if (!hci_can_send_acl_packet_now(channel->handle)) break; 690 channel->state = L2CAP_STATE_INVALID; 691 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 692 // 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 :) 693 l2cap_finialize_channel_close(channel); // -- remove from list 694 break; 695 696 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 697 if (!hci_can_send_acl_packet_now(channel->handle)) break; 698 channel->local_sig_id = l2cap_next_sig_id(); 699 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 700 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 701 break; 702 default: 703 break; 704 } 705 } 706 707 #ifdef HAVE_BLE 708 // send l2cap con paramter update if necessary 709 hci_connections_get_iterator(&it); 710 while(linked_list_iterator_has_next(&it)){ 711 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 712 if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 713 if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 714 switch (connection->le_con_parameter_update_state){ 715 case CON_PARAMETER_UPDATE_SEND_REQUEST: 716 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 717 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 718 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 719 break; 720 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 721 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 722 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 723 break; 724 case CON_PARAMETER_UPDATE_DENY: 725 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 726 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 727 break; 728 default: 729 break; 730 } 731 } 732 #endif 733 734 // log_info("l2cap_run: exit"); 735 } 736 737 uint16_t l2cap_max_mtu(void){ 738 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 739 } 740 741 uint16_t l2cap_max_le_mtu(void){ 742 return l2cap_max_mtu(); 743 } 744 745 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 746 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 747 log_info("l2cap_handle_connection_complete expected state"); 748 // success, start l2cap handshake 749 channel->handle = handle; 750 // check remote SSP feature first 751 channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 752 } 753 } 754 755 static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 756 if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 757 758 // we have been waiting for remote supported features, if both support SSP, 759 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)); 760 if (hci_ssp_supported_on_both_sides(channel->handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 761 // request security level 2 762 channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 763 gap_request_security_level(channel->handle, LEVEL_2); 764 return; 765 } 766 // fine, go ahead 767 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 768 } 769 770 /** 771 * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 772 * @param packet_handler 773 * @param address 774 * @param psm 775 * @param mtu 776 * @param local_cid 777 */ 778 uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t mtu, uint16_t * out_local_cid){ 779 log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 780 781 // alloc structure 782 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 783 if (!chan) { 784 return BTSTACK_MEMORY_ALLOC_FAILED; 785 } 786 787 // Init memory (make valgrind happy) 788 memset(chan, 0, sizeof(l2cap_channel_t)); 789 // limit local mtu to max acl packet length - l2cap header 790 if (mtu > l2cap_max_mtu()) { 791 mtu = l2cap_max_mtu(); 792 } 793 794 // fill in 795 BD_ADDR_COPY(chan->address, address); 796 chan->psm = psm; 797 chan->handle = 0; 798 chan->packet_handler = channel_packet_handler; 799 chan->remote_mtu = L2CAP_MINIMAL_MTU; 800 chan->local_mtu = mtu; 801 chan->packets_granted = 0; 802 chan->local_cid = l2cap_next_local_cid(); 803 804 // set initial state 805 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 806 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 807 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 808 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 809 chan->required_security_level = LEVEL_0; 810 811 // add to connections list 812 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 813 814 // store local_cid 815 if (out_local_cid){ 816 *out_local_cid = chan->local_cid; 817 } 818 819 // check if hci connection is already usable 820 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 821 if (conn){ 822 log_info("l2cap_create_channel_internal, hci connection already exists"); 823 l2cap_handle_connection_complete(conn->con_handle, chan); 824 // check if remote supported fearures are already received 825 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 826 l2cap_handle_remote_supported_features_received(chan); 827 } 828 } 829 830 l2cap_run(); 831 832 return 0; 833 } 834 835 // open outgoing L2CAP channel 836 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t channel_packet_handler, 837 bd_addr_t address, uint16_t psm, uint16_t mtu){ 838 839 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 840 841 // alloc structure 842 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 843 if (!chan) { 844 // emit error event 845 l2cap_channel_t dummy_channel; 846 BD_ADDR_COPY(dummy_channel.address, address); 847 dummy_channel.psm = psm; 848 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 849 return; 850 } 851 852 // Init memory (make valgrind happy) 853 memset(chan, 0, sizeof(l2cap_channel_t)); 854 // limit local mtu to max acl packet length - l2cap header 855 if (mtu > l2cap_max_mtu()) { 856 mtu = l2cap_max_mtu(); 857 } 858 859 // fill in 860 BD_ADDR_COPY(chan->address, address); 861 chan->psm = psm; 862 chan->handle = 0; 863 chan->connection = connection; 864 chan->packet_handler = channel_packet_handler; 865 chan->remote_mtu = L2CAP_MINIMAL_MTU; 866 chan->local_mtu = mtu; 867 chan->packets_granted = 0; 868 chan->local_cid = l2cap_next_local_cid(); 869 870 // set initial state 871 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 872 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 873 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 874 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 875 chan->required_security_level = LEVEL_0; 876 877 // add to connections list 878 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 879 880 // check if hci connection is already usable 881 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 882 if (conn){ 883 log_info("l2cap_create_channel_internal, hci connection already exists"); 884 l2cap_handle_connection_complete(conn->con_handle, chan); 885 // check if remote supported fearures are already received 886 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 887 l2cap_handle_remote_supported_features_received(chan); 888 } 889 } 890 891 l2cap_run(); 892 } 893 894 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 895 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 896 // find channel for local_cid 897 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 898 if (channel) { 899 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 900 } 901 // process 902 l2cap_run(); 903 } 904 905 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 906 linked_list_iterator_t it; 907 linked_list_iterator_init(&it, &l2cap_channels); 908 while (linked_list_iterator_has_next(&it)){ 909 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 910 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 911 // channel for this address found 912 switch (channel->state){ 913 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 914 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 915 // failure, forward error code 916 l2cap_emit_channel_opened(channel, status); 917 // discard channel 918 l2cap_stop_rtx(channel); 919 linked_list_iterator_remove(&it); 920 btstack_memory_l2cap_channel_free(channel); 921 break; 922 default: 923 break; 924 } 925 } 926 } 927 928 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 929 linked_list_iterator_t it; 930 linked_list_iterator_init(&it, &l2cap_channels); 931 while (linked_list_iterator_has_next(&it)){ 932 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 933 if ( ! BD_ADDR_CMP( channel->address, address) ){ 934 l2cap_handle_connection_complete(handle, channel); 935 } 936 } 937 // process 938 l2cap_run(); 939 } 940 941 static void l2cap_event_handler(uint8_t *packet, uint16_t size){ 942 943 bd_addr_t address; 944 hci_con_handle_t handle; 945 linked_list_iterator_t it; 946 int hci_con_used; 947 948 switch(packet[0]){ 949 950 // handle connection complete events 951 case HCI_EVENT_CONNECTION_COMPLETE: 952 bt_flip_addr(address, &packet[5]); 953 if (packet[2] == 0){ 954 handle = READ_BT_16(packet, 3); 955 l2cap_handle_connection_success_for_addr(address, handle); 956 } else { 957 l2cap_handle_connection_failed_for_addr(address, packet[2]); 958 } 959 break; 960 961 // handle successful create connection cancel command 962 case HCI_EVENT_COMMAND_COMPLETE: 963 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 964 if (packet[5] == 0){ 965 bt_flip_addr(address, &packet[6]); 966 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 967 l2cap_handle_connection_failed_for_addr(address, 0x16); 968 } 969 } 970 l2cap_run(); // try sending signaling packets first 971 break; 972 973 case HCI_EVENT_COMMAND_STATUS: 974 l2cap_run(); // try sending signaling packets first 975 break; 976 977 // handle disconnection complete events 978 case HCI_EVENT_DISCONNECTION_COMPLETE: 979 // send l2cap disconnect events for all channels on this handle and free them 980 handle = READ_BT_16(packet, 3); 981 linked_list_iterator_init(&it, &l2cap_channels); 982 while (linked_list_iterator_has_next(&it)){ 983 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 984 if (channel->handle != handle) continue; 985 l2cap_emit_channel_closed(channel); 986 l2cap_stop_rtx(channel); 987 linked_list_iterator_remove(&it); 988 btstack_memory_l2cap_channel_free(channel); 989 } 990 break; 991 992 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 993 l2cap_run(); // try sending signaling packets first 994 l2cap_hand_out_credits(); 995 break; 996 997 // HCI Connection Timeouts 998 case L2CAP_EVENT_TIMEOUT_CHECK: 999 handle = READ_BT_16(packet, 2); 1000 if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 1001 if (hci_authentication_active_for_handle(handle)) break; 1002 hci_con_used = 0; 1003 linked_list_iterator_init(&it, &l2cap_channels); 1004 while (linked_list_iterator_has_next(&it)){ 1005 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1006 if (channel->handle != handle) continue; 1007 hci_con_used = 1; 1008 break; 1009 } 1010 if (hci_con_used) break; 1011 if (!hci_can_send_command_packet_now()) break; 1012 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 1013 break; 1014 1015 case DAEMON_EVENT_HCI_PACKET_SENT: 1016 linked_list_iterator_init(&it, &l2cap_channels); 1017 while (linked_list_iterator_has_next(&it)){ 1018 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1019 if (!channel->packet_handler) continue; 1020 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 1021 } 1022 if (attribute_protocol_packet_handler) { 1023 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1024 } 1025 if (security_protocol_packet_handler) { 1026 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1027 } 1028 if (connectionless_channel_packet_handler) { 1029 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1030 } 1031 break; 1032 1033 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1034 handle = READ_BT_16(packet, 3); 1035 linked_list_iterator_init(&it, &l2cap_channels); 1036 while (linked_list_iterator_has_next(&it)){ 1037 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1038 if (channel->handle != handle) continue; 1039 l2cap_handle_remote_supported_features_received(channel); 1040 break; 1041 } 1042 break; 1043 1044 case GAP_SECURITY_LEVEL: 1045 handle = READ_BT_16(packet, 2); 1046 log_info("l2cap - security level update"); 1047 linked_list_iterator_init(&it, &l2cap_channels); 1048 while (linked_list_iterator_has_next(&it)){ 1049 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1050 if (channel->handle != handle) continue; 1051 1052 log_info("l2cap - state %u", channel->state); 1053 1054 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 1055 gap_security_level_t required_level = channel->required_security_level; 1056 1057 switch (channel->state){ 1058 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 1059 if (actual_level >= required_level){ 1060 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1061 l2cap_emit_connection_request(channel); 1062 } else { 1063 channel->reason = 0x0003; // security block 1064 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1065 } 1066 break; 1067 1068 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1069 if (actual_level >= required_level){ 1070 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1071 } else { 1072 // disconnnect, authentication not good enough 1073 hci_disconnect_security_block(handle); 1074 } 1075 break; 1076 1077 default: 1078 break; 1079 } 1080 } 1081 break; 1082 1083 default: 1084 break; 1085 } 1086 1087 // pass on: main packet handler, att and sm packet handlers 1088 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1089 if (attribute_protocol_packet_handler){ 1090 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1091 } 1092 if (security_protocol_packet_handler) { 1093 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1094 } 1095 if (connectionless_channel_packet_handler) { 1096 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1097 } 1098 1099 l2cap_run(); 1100 } 1101 1102 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1103 channel->remote_sig_id = identifier; 1104 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1105 l2cap_run(); 1106 } 1107 1108 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1109 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1110 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1111 signaling_responses[signaling_responses_pending].handle = handle; 1112 signaling_responses[signaling_responses_pending].code = code; 1113 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1114 signaling_responses[signaling_responses_pending].data = data; 1115 signaling_responses_pending++; 1116 l2cap_run(); 1117 } 1118 } 1119 1120 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1121 1122 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1123 l2cap_service_t *service = l2cap_get_service(psm); 1124 if (!service) { 1125 // 0x0002 PSM not supported 1126 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1127 return; 1128 } 1129 1130 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1131 if (!hci_connection) { 1132 // 1133 log_error("no hci_connection for handle %u", handle); 1134 return; 1135 } 1136 1137 // alloc structure 1138 // log_info("l2cap_handle_connection_request register channel"); 1139 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1140 if (!channel){ 1141 // 0x0004 No resources available 1142 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1143 return; 1144 } 1145 // Init memory (make valgrind happy) 1146 memset(channel, 0, sizeof(l2cap_channel_t)); 1147 // fill in 1148 BD_ADDR_COPY(channel->address, hci_connection->address); 1149 channel->psm = psm; 1150 channel->handle = handle; 1151 channel->connection = service->connection; 1152 channel->packet_handler = service->packet_handler; 1153 channel->local_cid = l2cap_next_local_cid(); 1154 channel->remote_cid = source_cid; 1155 channel->local_mtu = service->mtu; 1156 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1157 channel->packets_granted = 0; 1158 channel->remote_sig_id = sig_id; 1159 channel->required_security_level = service->required_security_level; 1160 1161 // limit local mtu to max acl packet length - l2cap header 1162 if (channel->local_mtu > l2cap_max_mtu()) { 1163 channel->local_mtu = l2cap_max_mtu(); 1164 } 1165 1166 // set initial state 1167 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1168 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1169 1170 // add to connections list 1171 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1172 1173 // assert security requirements 1174 gap_request_security_level(handle, channel->required_security_level); 1175 } 1176 1177 void l2cap_accept_connection_internal(uint16_t local_cid){ 1178 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1179 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1180 if (!channel) { 1181 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1182 return; 1183 } 1184 1185 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1186 1187 // process 1188 l2cap_run(); 1189 } 1190 1191 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1192 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1193 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1194 if (!channel) { 1195 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1196 return; 1197 } 1198 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1199 channel->reason = reason; 1200 l2cap_run(); 1201 } 1202 1203 static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1204 1205 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1206 1207 uint16_t flags = READ_BT_16(command, 6); 1208 if (flags & 1) { 1209 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1210 } 1211 1212 // accept the other's configuration options 1213 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1214 uint16_t pos = 8; 1215 while (pos < end_pos){ 1216 uint8_t option_hint = command[pos] >> 7; 1217 uint8_t option_type = command[pos] & 0x7f; 1218 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1219 pos++; 1220 uint8_t length = command[pos++]; 1221 // MTU { type(8): 1, len(8):2, MTU(16) } 1222 if (option_type == 1 && length == 2){ 1223 channel->remote_mtu = READ_BT_16(command, pos); 1224 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1225 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1226 } 1227 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1228 if (option_type == 2 && length == 2){ 1229 channel->flush_timeout = READ_BT_16(command, pos); 1230 } 1231 // check for unknown options 1232 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1233 log_info("l2cap cid %u, unknown options", channel->local_cid); 1234 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1235 } 1236 pos += length; 1237 } 1238 } 1239 1240 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1241 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1242 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1243 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1244 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1245 if (channel->state == L2CAP_STATE_OPEN) return 0; 1246 return 1; 1247 } 1248 1249 1250 static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1251 1252 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1253 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1254 uint16_t result = 0; 1255 1256 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1257 1258 // handle DISCONNECT REQUESTS seperately 1259 if (code == DISCONNECTION_REQUEST){ 1260 switch (channel->state){ 1261 case L2CAP_STATE_CONFIG: 1262 case L2CAP_STATE_OPEN: 1263 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1264 case L2CAP_STATE_WAIT_DISCONNECT: 1265 l2cap_handle_disconnect_request(channel, identifier); 1266 break; 1267 1268 default: 1269 // ignore in other states 1270 break; 1271 } 1272 return; 1273 } 1274 1275 // @STATEMACHINE(l2cap) 1276 switch (channel->state) { 1277 1278 case L2CAP_STATE_WAIT_CONNECT_RSP: 1279 switch (code){ 1280 case CONNECTION_RESPONSE: 1281 l2cap_stop_rtx(channel); 1282 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1283 switch (result) { 1284 case 0: 1285 // successful connection 1286 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1287 channel->state = L2CAP_STATE_CONFIG; 1288 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1289 break; 1290 case 1: 1291 // connection pending. get some coffee, but start the ERTX 1292 l2cap_start_ertx(channel); 1293 break; 1294 default: 1295 // channel closed 1296 channel->state = L2CAP_STATE_CLOSED; 1297 // map l2cap connection response result to BTstack status enumeration 1298 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1299 1300 // drop link key if security block 1301 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1302 hci_drop_link_key_for_bd_addr(channel->address); 1303 } 1304 1305 // discard channel 1306 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1307 btstack_memory_l2cap_channel_free(channel); 1308 break; 1309 } 1310 break; 1311 1312 default: 1313 //@TODO: implement other signaling packets 1314 break; 1315 } 1316 break; 1317 1318 case L2CAP_STATE_CONFIG: 1319 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1320 switch (code) { 1321 case CONFIGURE_REQUEST: 1322 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1323 l2cap_signaling_handle_configure_request(channel, command); 1324 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1325 // only done if continuation not set 1326 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1327 } 1328 break; 1329 case CONFIGURE_RESPONSE: 1330 l2cap_stop_rtx(channel); 1331 switch (result){ 1332 case 0: // success 1333 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1334 break; 1335 case 4: // pending 1336 l2cap_start_ertx(channel); 1337 break; 1338 default: 1339 // retry on negative result 1340 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1341 break; 1342 } 1343 break; 1344 default: 1345 break; 1346 } 1347 if (l2cap_channel_ready_for_open(channel)){ 1348 // for open: 1349 channel->state = L2CAP_STATE_OPEN; 1350 l2cap_emit_channel_opened(channel, 0); 1351 l2cap_emit_credits(channel, 1); 1352 } 1353 break; 1354 1355 case L2CAP_STATE_WAIT_DISCONNECT: 1356 switch (code) { 1357 case DISCONNECTION_RESPONSE: 1358 l2cap_finialize_channel_close(channel); 1359 break; 1360 default: 1361 //@TODO: implement other signaling packets 1362 break; 1363 } 1364 break; 1365 1366 case L2CAP_STATE_CLOSED: 1367 // @TODO handle incoming requests 1368 break; 1369 1370 case L2CAP_STATE_OPEN: 1371 //@TODO: implement other signaling packets, e.g. re-configure 1372 break; 1373 default: 1374 break; 1375 } 1376 // log_info("new state %u", channel->state); 1377 } 1378 1379 1380 static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1381 1382 // get code, signalind identifier and command len 1383 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1384 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1385 1386 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1387 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1388 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1389 return; 1390 } 1391 1392 // general commands without an assigned channel 1393 switch(code) { 1394 1395 case CONNECTION_REQUEST: { 1396 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1397 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1398 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1399 return; 1400 } 1401 1402 case ECHO_REQUEST: 1403 l2cap_register_signaling_response(handle, code, sig_id, 0); 1404 return; 1405 1406 case INFORMATION_REQUEST: { 1407 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1408 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1409 return; 1410 } 1411 1412 default: 1413 break; 1414 } 1415 1416 1417 // Get potential destination CID 1418 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1419 1420 // Find channel for this sig_id and connection handle 1421 linked_list_iterator_t it; 1422 linked_list_iterator_init(&it, &l2cap_channels); 1423 while (linked_list_iterator_has_next(&it)){ 1424 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1425 if (channel->handle != handle) continue; 1426 if (code & 1) { 1427 // match odd commands (responses) by previous signaling identifier 1428 if (channel->local_sig_id == sig_id) { 1429 l2cap_signaling_handler_channel(channel, command); 1430 break; 1431 } 1432 } else { 1433 // match even commands (requests) by local channel id 1434 if (channel->local_cid == dest_cid) { 1435 l2cap_signaling_handler_channel(channel, command); 1436 break; 1437 } 1438 } 1439 } 1440 } 1441 1442 static void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1443 1444 // Get Channel ID 1445 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1446 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1447 1448 switch (channel_id) { 1449 1450 case L2CAP_CID_SIGNALING: { 1451 1452 uint16_t command_offset = 8; 1453 while (command_offset < size) { 1454 1455 // handle signaling commands 1456 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1457 1458 // increment command_offset 1459 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1460 } 1461 break; 1462 } 1463 1464 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1465 if (attribute_protocol_packet_handler) { 1466 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1467 } 1468 break; 1469 1470 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1471 if (security_protocol_packet_handler) { 1472 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1473 } 1474 break; 1475 1476 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1477 if (connectionless_channel_packet_handler) { 1478 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1479 } 1480 break; 1481 1482 case L2CAP_CID_SIGNALING_LE: { 1483 switch (packet[8]){ 1484 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1485 uint16_t result = READ_BT_16(packet, 12); 1486 l2cap_emit_connection_parameter_update_response(handle, result); 1487 break; 1488 } 1489 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1490 uint8_t event[10]; 1491 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1492 event[1] = 8; 1493 memcpy(&event[2], &packet[12], 8); 1494 1495 hci_connection_t * connection = hci_connection_for_handle(handle); 1496 if (connection){ 1497 if (connection->role != HCI_ROLE_MASTER){ 1498 // reject command without notifying upper layer when not in master role 1499 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1500 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1501 break; 1502 } 1503 int update_parameter = 1; 1504 le_connection_parameter_range_t existing_range; 1505 gap_le_get_connection_parameter_range(existing_range); 1506 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1507 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1508 uint16_t le_conn_latency = READ_BT_16(packet,16); 1509 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1510 1511 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1512 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1513 1514 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1515 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1516 1517 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1518 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1519 1520 if (update_parameter){ 1521 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1522 connection->le_conn_interval_min = le_conn_interval_min; 1523 connection->le_conn_interval_max = le_conn_interval_max; 1524 connection->le_conn_latency = le_conn_latency; 1525 connection->le_supervision_timeout = le_supervision_timeout; 1526 } else { 1527 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1528 } 1529 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1530 } 1531 1532 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1533 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1534 1535 break; 1536 } 1537 default: { 1538 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1539 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1540 break; 1541 } 1542 } 1543 break; 1544 } 1545 1546 default: { 1547 // Find channel for this channel_id and connection handle 1548 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1549 if (channel) { 1550 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1551 } 1552 break; 1553 } 1554 } 1555 } 1556 1557 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1558 switch (packet_type) { 1559 case HCI_EVENT_PACKET: 1560 l2cap_event_handler(packet, size); 1561 break; 1562 case HCI_ACL_DATA_PACKET: 1563 l2cap_acl_handler(packet, size); 1564 break; 1565 default: 1566 break; 1567 } 1568 l2cap_run(); 1569 } 1570 1571 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1572 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1573 channel->state = L2CAP_STATE_CLOSED; 1574 l2cap_emit_channel_closed(channel); 1575 // discard channel 1576 l2cap_stop_rtx(channel); 1577 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1578 btstack_memory_l2cap_channel_free(channel); 1579 } 1580 1581 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1582 linked_list_iterator_t it; 1583 linked_list_iterator_init(&it, services); 1584 while (linked_list_iterator_has_next(&it)){ 1585 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1586 if ( service->psm == psm){ 1587 return service; 1588 }; 1589 } 1590 return NULL; 1591 } 1592 1593 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1594 return l2cap_get_service_internal(&l2cap_services, psm); 1595 } 1596 1597 void l2cap_register_service_internal(void *connection, btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1598 1599 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1600 1601 // check for alread registered psm 1602 // TODO: emit error event 1603 l2cap_service_t *service = l2cap_get_service(psm); 1604 if (service) { 1605 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1606 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1607 return; 1608 } 1609 1610 // alloc structure 1611 // TODO: emit error event 1612 service = btstack_memory_l2cap_service_get(); 1613 if (!service) { 1614 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1615 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1616 return; 1617 } 1618 1619 // fill in 1620 service->psm = psm; 1621 service->mtu = mtu; 1622 service->connection = connection; 1623 service->packet_handler = service_packet_handler; 1624 service->required_security_level = security_level; 1625 1626 // add to services list 1627 linked_list_add(&l2cap_services, (linked_item_t *) service); 1628 1629 // enable page scan 1630 hci_connectable_control(1); 1631 1632 // done 1633 l2cap_emit_service_registered(connection, 0, psm); 1634 } 1635 1636 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1637 1638 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1639 1640 l2cap_service_t *service = l2cap_get_service(psm); 1641 if (!service) return; 1642 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1643 btstack_memory_l2cap_service_free(service); 1644 1645 // disable page scan when no services registered 1646 if (!linked_list_empty(&l2cap_services)) return; 1647 hci_connectable_control(0); 1648 } 1649 1650 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1651 void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 1652 switch(channel_id){ 1653 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1654 attribute_protocol_packet_handler = the_packet_handler; 1655 break; 1656 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1657 security_protocol_packet_handler = the_packet_handler; 1658 break; 1659 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1660 connectionless_channel_packet_handler = the_packet_handler; 1661 break; 1662 } 1663 } 1664 1665 #ifdef HAVE_BLE 1666 1667 1668 #if 0 1669 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1670 return l2cap_get_service_internal(&l2cap_le_services, psm); 1671 } 1672 /** 1673 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1674 * @param 1675 */ 1676 void l2cap_le_register_service_internal(void * connection, btstack_packet_handler_t packet_handler, uint16_t psm, 1677 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1678 1679 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1680 1681 // check for alread registered psm 1682 // TODO: emit error event 1683 l2cap_service_t *service = l2cap_le_get_service(psm); 1684 if (service) { 1685 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1686 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1687 return; 1688 } 1689 1690 // alloc structure 1691 // TODO: emit error event 1692 service = btstack_memory_l2cap_service_get(); 1693 if (!service) { 1694 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1695 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1696 return; 1697 } 1698 1699 // fill in 1700 service->psm = psm; 1701 service->mtu = mtu; 1702 service->mps = mps; 1703 service->connection = connection; 1704 service->packet_handler = packet_handler; 1705 service->required_security_level = security_level; 1706 1707 // add to services list 1708 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1709 1710 // done 1711 l2cap_emit_service_registered(connection, 0, psm); 1712 } 1713 1714 void l2cap_le_unregister_service_internal(void * connection, uint16_t psm) { 1715 1716 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1717 1718 l2cap_service_t *service = l2cap_le_get_service(psm); 1719 if (!service) return; 1720 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1721 btstack_memory_l2cap_service_free(service); 1722 } 1723 #endif 1724 #endif 1725