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 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 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 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 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 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 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 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 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 (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 713 switch (connection->le_con_parameter_update_state){ 714 case CON_PARAMETER_UPDATE_SEND_REQUEST: 715 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 716 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 717 connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 718 break; 719 case CON_PARAMETER_UPDATE_SEND_RESPONSE: 720 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 721 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 722 break; 723 case CON_PARAMETER_UPDATE_DENY: 724 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 725 l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 726 break; 727 default: 728 break; 729 } 730 } 731 #endif 732 733 // log_info("l2cap_run: exit"); 734 } 735 736 uint16_t l2cap_max_mtu(void){ 737 return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 738 } 739 740 uint16_t l2cap_max_le_mtu(void){ 741 return l2cap_max_mtu(); 742 } 743 744 static void l2cap_handle_connection_complete(uint16_t handle, l2cap_channel_t * channel){ 745 if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 746 log_info("l2cap_handle_connection_complete expected state"); 747 // success, start l2cap handshake 748 channel->handle = handle; 749 channel->local_cid = l2cap_next_local_cid(); 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 // open outgoing L2CAP channel 771 void l2cap_create_channel_internal(void * connection, btstack_packet_handler_t packet_handler, 772 bd_addr_t address, uint16_t psm, uint16_t mtu){ 773 774 log_info("L2CAP_CREATE_CHANNEL_MTU addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, mtu); 775 776 // alloc structure 777 l2cap_channel_t * chan = btstack_memory_l2cap_channel_get(); 778 if (!chan) { 779 // emit error event 780 l2cap_channel_t dummy_channel; 781 BD_ADDR_COPY(dummy_channel.address, address); 782 dummy_channel.psm = psm; 783 l2cap_emit_channel_opened(&dummy_channel, BTSTACK_MEMORY_ALLOC_FAILED); 784 return; 785 } 786 // Init memory (make valgrind happy) 787 memset(chan, 0, sizeof(l2cap_channel_t)); 788 // limit local mtu to max acl packet length - l2cap header 789 if (mtu > l2cap_max_mtu()) { 790 mtu = l2cap_max_mtu(); 791 } 792 793 // fill in 794 BD_ADDR_COPY(chan->address, address); 795 chan->psm = psm; 796 chan->handle = 0; 797 chan->connection = connection; 798 chan->packet_handler = packet_handler; 799 chan->remote_mtu = L2CAP_MINIMAL_MTU; 800 chan->local_mtu = mtu; 801 chan->packets_granted = 0; 802 803 // set initial state 804 chan->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 805 chan->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 806 chan->remote_sig_id = L2CAP_SIG_ID_INVALID; 807 chan->local_sig_id = L2CAP_SIG_ID_INVALID; 808 chan->required_security_level = LEVEL_0; 809 810 // add to connections list 811 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 812 813 // check if hci connection is already usable 814 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 815 if (conn){ 816 log_info("l2cap_create_channel_internal, hci connection already exists"); 817 l2cap_handle_connection_complete(conn->con_handle, chan); 818 // check if remote supported fearures are already received 819 if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 820 l2cap_handle_remote_supported_features_received(chan); 821 } 822 } 823 824 l2cap_run(); 825 } 826 827 void l2cap_disconnect_internal(uint16_t local_cid, uint8_t reason){ 828 log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 829 // find channel for local_cid 830 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 831 if (channel) { 832 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 833 } 834 // process 835 l2cap_run(); 836 } 837 838 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 839 linked_list_iterator_t it; 840 linked_list_iterator_init(&it, &l2cap_channels); 841 while (linked_list_iterator_has_next(&it)){ 842 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 843 if ( BD_ADDR_CMP( channel->address, address) != 0) continue; 844 // channel for this address found 845 switch (channel->state){ 846 case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 847 case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 848 // failure, forward error code 849 l2cap_emit_channel_opened(channel, status); 850 // discard channel 851 l2cap_stop_rtx(channel); 852 linked_list_iterator_remove(&it); 853 btstack_memory_l2cap_channel_free(channel); 854 break; 855 default: 856 break; 857 } 858 } 859 } 860 861 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 862 linked_list_iterator_t it; 863 linked_list_iterator_init(&it, &l2cap_channels); 864 while (linked_list_iterator_has_next(&it)){ 865 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 866 if ( ! BD_ADDR_CMP( channel->address, address) ){ 867 l2cap_handle_connection_complete(handle, channel); 868 } 869 } 870 // process 871 l2cap_run(); 872 } 873 874 void l2cap_event_handler(uint8_t *packet, uint16_t size){ 875 876 bd_addr_t address; 877 hci_con_handle_t handle; 878 linked_list_iterator_t it; 879 int hci_con_used; 880 881 switch(packet[0]){ 882 883 // handle connection complete events 884 case HCI_EVENT_CONNECTION_COMPLETE: 885 bt_flip_addr(address, &packet[5]); 886 if (packet[2] == 0){ 887 handle = READ_BT_16(packet, 3); 888 l2cap_handle_connection_success_for_addr(address, handle); 889 } else { 890 l2cap_handle_connection_failed_for_addr(address, packet[2]); 891 } 892 break; 893 894 // handle successful create connection cancel command 895 case HCI_EVENT_COMMAND_COMPLETE: 896 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 897 if (packet[5] == 0){ 898 bt_flip_addr(address, &packet[6]); 899 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 900 l2cap_handle_connection_failed_for_addr(address, 0x16); 901 } 902 } 903 l2cap_run(); // try sending signaling packets first 904 break; 905 906 case HCI_EVENT_COMMAND_STATUS: 907 l2cap_run(); // try sending signaling packets first 908 break; 909 910 // handle disconnection complete events 911 case HCI_EVENT_DISCONNECTION_COMPLETE: 912 // send l2cap disconnect events for all channels on this handle and free them 913 handle = READ_BT_16(packet, 3); 914 linked_list_iterator_init(&it, &l2cap_channels); 915 while (linked_list_iterator_has_next(&it)){ 916 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 917 if (channel->handle != handle) continue; 918 l2cap_emit_channel_closed(channel); 919 l2cap_stop_rtx(channel); 920 linked_list_iterator_remove(&it); 921 btstack_memory_l2cap_channel_free(channel); 922 } 923 break; 924 925 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 926 l2cap_run(); // try sending signaling packets first 927 l2cap_hand_out_credits(); 928 break; 929 930 // HCI Connection Timeouts 931 case L2CAP_EVENT_TIMEOUT_CHECK: 932 handle = READ_BT_16(packet, 2); 933 if (hci_authentication_active_for_handle(handle)) break; 934 hci_con_used = 0; 935 linked_list_iterator_init(&it, &l2cap_channels); 936 while (linked_list_iterator_has_next(&it)){ 937 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 938 if (channel->handle != handle) continue; 939 hci_con_used = 1; 940 break; 941 } 942 if (hci_con_used) break; 943 if (!hci_can_send_command_packet_now()) break; 944 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 945 break; 946 947 case DAEMON_EVENT_HCI_PACKET_SENT: 948 linked_list_iterator_init(&it, &l2cap_channels); 949 while (linked_list_iterator_has_next(&it)){ 950 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 951 if (!channel->packet_handler) continue; 952 (* (channel->packet_handler))(HCI_EVENT_PACKET, channel->local_cid, packet, size); 953 } 954 if (attribute_protocol_packet_handler) { 955 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 956 } 957 if (security_protocol_packet_handler) { 958 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 959 } 960 if (connectionless_channel_packet_handler) { 961 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 962 } 963 break; 964 965 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 966 handle = READ_BT_16(packet, 3); 967 linked_list_iterator_init(&it, &l2cap_channels); 968 while (linked_list_iterator_has_next(&it)){ 969 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 970 if (channel->handle != handle) continue; 971 l2cap_handle_remote_supported_features_received(channel); 972 break; 973 } 974 break; 975 976 case GAP_SECURITY_LEVEL: 977 handle = READ_BT_16(packet, 2); 978 log_info("l2cap - security level update"); 979 linked_list_iterator_init(&it, &l2cap_channels); 980 while (linked_list_iterator_has_next(&it)){ 981 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 982 if (channel->handle != handle) continue; 983 984 log_info("l2cap - state %u", channel->state); 985 986 gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 987 gap_security_level_t required_level = channel->required_security_level; 988 989 switch (channel->state){ 990 case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 991 if (actual_level >= required_level){ 992 channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 993 l2cap_emit_connection_request(channel); 994 } else { 995 channel->reason = 0x0003; // security block 996 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 997 } 998 break; 999 1000 case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 1001 if (actual_level >= required_level){ 1002 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1003 } else { 1004 // disconnnect, authentication not good enough 1005 hci_disconnect_security_block(handle); 1006 } 1007 break; 1008 1009 default: 1010 break; 1011 } 1012 } 1013 break; 1014 1015 default: 1016 break; 1017 } 1018 1019 // pass on: main packet handler, att and sm packet handlers 1020 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, packet, size); 1021 if (attribute_protocol_packet_handler){ 1022 (*attribute_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1023 } 1024 if (security_protocol_packet_handler) { 1025 (*security_protocol_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1026 } 1027 if (connectionless_channel_packet_handler) { 1028 (*connectionless_channel_packet_handler)(HCI_EVENT_PACKET, 0, packet, size); 1029 } 1030 1031 l2cap_run(); 1032 } 1033 1034 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1035 channel->remote_sig_id = identifier; 1036 channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1037 l2cap_run(); 1038 } 1039 1040 static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 1041 // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 1042 if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 1043 signaling_responses[signaling_responses_pending].handle = handle; 1044 signaling_responses[signaling_responses_pending].code = code; 1045 signaling_responses[signaling_responses_pending].sig_id = sig_id; 1046 signaling_responses[signaling_responses_pending].data = data; 1047 signaling_responses_pending++; 1048 l2cap_run(); 1049 } 1050 } 1051 1052 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1053 1054 // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1055 l2cap_service_t *service = l2cap_get_service(psm); 1056 if (!service) { 1057 // 0x0002 PSM not supported 1058 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1059 return; 1060 } 1061 1062 hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1063 if (!hci_connection) { 1064 // 1065 log_error("no hci_connection for handle %u", handle); 1066 return; 1067 } 1068 1069 // alloc structure 1070 // log_info("l2cap_handle_connection_request register channel"); 1071 l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 1072 if (!channel){ 1073 // 0x0004 No resources available 1074 l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 1075 return; 1076 } 1077 // Init memory (make valgrind happy) 1078 memset(channel, 0, sizeof(l2cap_channel_t)); 1079 // fill in 1080 BD_ADDR_COPY(channel->address, hci_connection->address); 1081 channel->psm = psm; 1082 channel->handle = handle; 1083 channel->connection = service->connection; 1084 channel->packet_handler = service->packet_handler; 1085 channel->local_cid = l2cap_next_local_cid(); 1086 channel->remote_cid = source_cid; 1087 channel->local_mtu = service->mtu; 1088 channel->remote_mtu = L2CAP_DEFAULT_MTU; 1089 channel->packets_granted = 0; 1090 channel->remote_sig_id = sig_id; 1091 channel->required_security_level = service->required_security_level; 1092 1093 // limit local mtu to max acl packet length - l2cap header 1094 if (channel->local_mtu > l2cap_max_mtu()) { 1095 channel->local_mtu = l2cap_max_mtu(); 1096 } 1097 1098 // set initial state 1099 channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1100 channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1101 1102 // add to connections list 1103 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 1104 1105 // assert security requirements 1106 gap_request_security_level(handle, channel->required_security_level); 1107 } 1108 1109 void l2cap_accept_connection_internal(uint16_t local_cid){ 1110 log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1111 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1112 if (!channel) { 1113 log_error("l2cap_accept_connection_internal called but local_cid 0x%x not found", local_cid); 1114 return; 1115 } 1116 1117 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1118 1119 // process 1120 l2cap_run(); 1121 } 1122 1123 void l2cap_decline_connection_internal(uint16_t local_cid, uint8_t reason){ 1124 log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x, reason %x", local_cid, reason); 1125 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1126 if (!channel) { 1127 log_error( "l2cap_decline_connection_internal called but local_cid 0x%x not found", local_cid); 1128 return; 1129 } 1130 channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 1131 channel->reason = reason; 1132 l2cap_run(); 1133 } 1134 1135 void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1136 1137 channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1138 1139 uint16_t flags = READ_BT_16(command, 6); 1140 if (flags & 1) { 1141 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 1142 } 1143 1144 // accept the other's configuration options 1145 uint16_t end_pos = 4 + READ_BT_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1146 uint16_t pos = 8; 1147 while (pos < end_pos){ 1148 uint8_t option_hint = command[pos] >> 7; 1149 uint8_t option_type = command[pos] & 0x7f; 1150 log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 1151 pos++; 1152 uint8_t length = command[pos++]; 1153 // MTU { type(8): 1, len(8):2, MTU(16) } 1154 if (option_type == 1 && length == 2){ 1155 channel->remote_mtu = READ_BT_16(command, pos); 1156 // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 1157 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 1158 } 1159 // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 1160 if (option_type == 2 && length == 2){ 1161 channel->flush_timeout = READ_BT_16(command, pos); 1162 } 1163 // check for unknown options 1164 if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1165 log_info("l2cap cid %u, unknown options", channel->local_cid); 1166 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 1167 } 1168 pos += length; 1169 } 1170 } 1171 1172 static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 1173 // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 1174 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 1175 if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1176 // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1177 if (channel->state == L2CAP_STATE_OPEN) return 0; 1178 return 1; 1179 } 1180 1181 1182 void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 1183 1184 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1185 uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1186 uint16_t result = 0; 1187 1188 log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1189 1190 // handle DISCONNECT REQUESTS seperately 1191 if (code == DISCONNECTION_REQUEST){ 1192 switch (channel->state){ 1193 case L2CAP_STATE_CONFIG: 1194 case L2CAP_STATE_OPEN: 1195 case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 1196 case L2CAP_STATE_WAIT_DISCONNECT: 1197 l2cap_handle_disconnect_request(channel, identifier); 1198 break; 1199 1200 default: 1201 // ignore in other states 1202 break; 1203 } 1204 return; 1205 } 1206 1207 // @STATEMACHINE(l2cap) 1208 switch (channel->state) { 1209 1210 case L2CAP_STATE_WAIT_CONNECT_RSP: 1211 switch (code){ 1212 case CONNECTION_RESPONSE: 1213 l2cap_stop_rtx(channel); 1214 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1215 switch (result) { 1216 case 0: 1217 // successful connection 1218 channel->remote_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1219 channel->state = L2CAP_STATE_CONFIG; 1220 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1221 break; 1222 case 1: 1223 // connection pending. get some coffee, but start the ERTX 1224 l2cap_start_ertx(channel); 1225 break; 1226 default: 1227 // channel closed 1228 channel->state = L2CAP_STATE_CLOSED; 1229 // map l2cap connection response result to BTstack status enumeration 1230 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1231 1232 // drop link key if security block 1233 if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 1234 hci_drop_link_key_for_bd_addr(channel->address); 1235 } 1236 1237 // discard channel 1238 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1239 btstack_memory_l2cap_channel_free(channel); 1240 break; 1241 } 1242 break; 1243 1244 default: 1245 //@TODO: implement other signaling packets 1246 break; 1247 } 1248 break; 1249 1250 case L2CAP_STATE_CONFIG: 1251 result = READ_BT_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1252 switch (code) { 1253 case CONFIGURE_REQUEST: 1254 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1255 l2cap_signaling_handle_configure_request(channel, command); 1256 if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 1257 // only done if continuation not set 1258 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 1259 } 1260 break; 1261 case CONFIGURE_RESPONSE: 1262 l2cap_stop_rtx(channel); 1263 switch (result){ 1264 case 0: // success 1265 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 1266 break; 1267 case 4: // pending 1268 l2cap_start_ertx(channel); 1269 break; 1270 default: 1271 // retry on negative result 1272 channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1273 break; 1274 } 1275 break; 1276 default: 1277 break; 1278 } 1279 if (l2cap_channel_ready_for_open(channel)){ 1280 // for open: 1281 channel->state = L2CAP_STATE_OPEN; 1282 l2cap_emit_channel_opened(channel, 0); 1283 l2cap_emit_credits(channel, 1); 1284 } 1285 break; 1286 1287 case L2CAP_STATE_WAIT_DISCONNECT: 1288 switch (code) { 1289 case DISCONNECTION_RESPONSE: 1290 l2cap_finialize_channel_close(channel); 1291 break; 1292 default: 1293 //@TODO: implement other signaling packets 1294 break; 1295 } 1296 break; 1297 1298 case L2CAP_STATE_CLOSED: 1299 // @TODO handle incoming requests 1300 break; 1301 1302 case L2CAP_STATE_OPEN: 1303 //@TODO: implement other signaling packets, e.g. re-configure 1304 break; 1305 default: 1306 break; 1307 } 1308 // log_info("new state %u", channel->state); 1309 } 1310 1311 1312 void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 1313 1314 // get code, signalind identifier and command len 1315 uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 1316 uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1317 1318 // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 1319 if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 1320 l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1321 return; 1322 } 1323 1324 // general commands without an assigned channel 1325 switch(code) { 1326 1327 case CONNECTION_REQUEST: { 1328 uint16_t psm = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1329 uint16_t source_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 1330 l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 1331 return; 1332 } 1333 1334 case ECHO_REQUEST: 1335 l2cap_register_signaling_response(handle, code, sig_id, 0); 1336 return; 1337 1338 case INFORMATION_REQUEST: { 1339 uint16_t infoType = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1340 l2cap_register_signaling_response(handle, code, sig_id, infoType); 1341 return; 1342 } 1343 1344 default: 1345 break; 1346 } 1347 1348 1349 // Get potential destination CID 1350 uint16_t dest_cid = READ_BT_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1351 1352 // Find channel for this sig_id and connection handle 1353 linked_list_iterator_t it; 1354 linked_list_iterator_init(&it, &l2cap_channels); 1355 while (linked_list_iterator_has_next(&it)){ 1356 l2cap_channel_t * channel = (l2cap_channel_t *) linked_list_iterator_next(&it); 1357 if (channel->handle != handle) continue; 1358 if (code & 1) { 1359 // match odd commands (responses) by previous signaling identifier 1360 if (channel->local_sig_id == sig_id) { 1361 l2cap_signaling_handler_channel(channel, command); 1362 break; 1363 } 1364 } else { 1365 // match even commands (requests) by local channel id 1366 if (channel->local_cid == dest_cid) { 1367 l2cap_signaling_handler_channel(channel, command); 1368 break; 1369 } 1370 } 1371 } 1372 } 1373 1374 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 1375 1376 // Get Channel ID 1377 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1378 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1379 1380 switch (channel_id) { 1381 1382 case L2CAP_CID_SIGNALING: { 1383 1384 uint16_t command_offset = 8; 1385 while (command_offset < size) { 1386 1387 // handle signaling commands 1388 l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1389 1390 // increment command_offset 1391 command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + READ_BT_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1392 } 1393 break; 1394 } 1395 1396 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1397 if (attribute_protocol_packet_handler) { 1398 (*attribute_protocol_packet_handler)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1399 } 1400 break; 1401 1402 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1403 if (security_protocol_packet_handler) { 1404 (*security_protocol_packet_handler)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1405 } 1406 break; 1407 1408 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1409 if (connectionless_channel_packet_handler) { 1410 (*connectionless_channel_packet_handler)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1411 } 1412 break; 1413 1414 case L2CAP_CID_SIGNALING_LE: { 1415 switch (packet[8]){ 1416 case CONNECTION_PARAMETER_UPDATE_RESPONSE: { 1417 uint16_t result = READ_BT_16(packet, 12); 1418 l2cap_emit_connection_parameter_update_response(handle, result); 1419 break; 1420 } 1421 case CONNECTION_PARAMETER_UPDATE_REQUEST: { 1422 uint8_t event[10]; 1423 event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1424 event[1] = 8; 1425 memcpy(&event[2], &packet[12], 8); 1426 1427 hci_connection_t * connection = hci_connection_for_handle(handle); 1428 if (connection){ 1429 if (connection->role != HCI_ROLE_MASTER){ 1430 // reject command without notifying upper layer when not in master role 1431 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1432 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1433 break; 1434 } 1435 int update_parameter = 1; 1436 le_connection_parameter_range_t existing_range = gap_le_get_connection_parameter_range(); 1437 uint16_t le_conn_interval_min = READ_BT_16(packet,12); 1438 uint16_t le_conn_interval_max = READ_BT_16(packet,14); 1439 uint16_t le_conn_latency = READ_BT_16(packet,16); 1440 uint16_t le_supervision_timeout = READ_BT_16(packet,18); 1441 1442 if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1443 if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1444 1445 if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1446 if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1447 1448 if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1449 if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1450 1451 if (update_parameter){ 1452 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1453 connection->le_conn_interval_min = le_conn_interval_min; 1454 connection->le_conn_interval_max = le_conn_interval_max; 1455 connection->le_conn_latency = le_conn_latency; 1456 connection->le_supervision_timeout = le_supervision_timeout; 1457 } else { 1458 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1459 } 1460 connection->le_con_param_update_identifier = packet[COMPLETE_L2CAP_HEADER + 1]; 1461 } 1462 1463 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1464 (*packet_handler)(NULL, HCI_EVENT_PACKET, 0, event, sizeof(event)); 1465 1466 break; 1467 } 1468 default: { 1469 uint8_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1470 l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1471 break; 1472 } 1473 } 1474 break; 1475 } 1476 1477 default: { 1478 // Find channel for this channel_id and connection handle 1479 l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(channel_id); 1480 if (channel) { 1481 l2cap_dispatch(channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1482 } 1483 break; 1484 } 1485 } 1486 } 1487 1488 static void l2cap_packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1489 switch (packet_type) { 1490 case HCI_EVENT_PACKET: 1491 l2cap_event_handler(packet, size); 1492 break; 1493 case HCI_ACL_DATA_PACKET: 1494 l2cap_acl_handler(packet, size); 1495 break; 1496 default: 1497 break; 1498 } 1499 l2cap_run(); 1500 } 1501 1502 // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 1503 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 1504 channel->state = L2CAP_STATE_CLOSED; 1505 l2cap_emit_channel_closed(channel); 1506 // discard channel 1507 l2cap_stop_rtx(channel); 1508 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 1509 btstack_memory_l2cap_channel_free(channel); 1510 } 1511 1512 static l2cap_service_t * l2cap_get_service_internal(linked_list_t * services, uint16_t psm){ 1513 linked_list_iterator_t it; 1514 linked_list_iterator_init(&it, services); 1515 while (linked_list_iterator_has_next(&it)){ 1516 l2cap_service_t * service = (l2cap_service_t *) linked_list_iterator_next(&it); 1517 if ( service->psm == psm){ 1518 return service; 1519 }; 1520 } 1521 return NULL; 1522 } 1523 1524 static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 1525 return l2cap_get_service_internal(&l2cap_services, psm); 1526 } 1527 1528 void l2cap_register_service_internal(void *connection, btstack_packet_handler_t packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1529 1530 log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1531 1532 // check for alread registered psm 1533 // TODO: emit error event 1534 l2cap_service_t *service = l2cap_get_service(psm); 1535 if (service) { 1536 log_error("l2cap_register_service_internal: PSM %u already registered", psm); 1537 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1538 return; 1539 } 1540 1541 // alloc structure 1542 // TODO: emit error event 1543 service = btstack_memory_l2cap_service_get(); 1544 if (!service) { 1545 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1546 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1547 return; 1548 } 1549 1550 // fill in 1551 service->psm = psm; 1552 service->mtu = mtu; 1553 service->connection = connection; 1554 service->packet_handler = packet_handler; 1555 service->required_security_level = security_level; 1556 1557 // add to services list 1558 linked_list_add(&l2cap_services, (linked_item_t *) service); 1559 1560 // enable page scan 1561 hci_connectable_control(1); 1562 1563 // done 1564 l2cap_emit_service_registered(connection, 0, psm); 1565 } 1566 1567 void l2cap_unregister_service_internal(void *connection, uint16_t psm){ 1568 1569 log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1570 1571 l2cap_service_t *service = l2cap_get_service(psm); 1572 if (!service) return; 1573 linked_list_remove(&l2cap_services, (linked_item_t *) service); 1574 btstack_memory_l2cap_service_free(service); 1575 1576 // disable page scan when no services registered 1577 if (!linked_list_empty(&l2cap_services)) return; 1578 hci_connectable_control(0); 1579 } 1580 1581 // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 1582 void l2cap_register_fixed_channel(btstack_packet_handler_t packet_handler, uint16_t channel_id) { 1583 switch(channel_id){ 1584 case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1585 attribute_protocol_packet_handler = packet_handler; 1586 break; 1587 case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1588 security_protocol_packet_handler = packet_handler; 1589 break; 1590 case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1591 connectionless_channel_packet_handler = packet_handler; 1592 break; 1593 } 1594 } 1595 1596 #ifdef HAVE_BLE 1597 1598 static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm){ 1599 return l2cap_get_service_internal(&l2cap_le_services, psm); 1600 } 1601 1602 /** 1603 * @brief Regster L2CAP LE Credit Based Flow Control Mode service 1604 * @param 1605 */ 1606 void l2cap_le_register_service_internal(void * connection, btstack_packet_handler_t packet_handler, uint16_t psm, 1607 uint16_t mtu, uint16_t mps, uint16_t initial_credits, gap_security_level_t security_level){ 1608 1609 log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x mtu %u connection %p", psm, mtu, connection); 1610 1611 // check for alread registered psm 1612 // TODO: emit error event 1613 l2cap_service_t *service = l2cap_le_get_service(psm); 1614 if (service) { 1615 log_error("l2cap_le_register_service_internal: PSM %u already registered", psm); 1616 l2cap_emit_service_registered(connection, L2CAP_SERVICE_ALREADY_REGISTERED, psm); 1617 return; 1618 } 1619 1620 // alloc structure 1621 // TODO: emit error event 1622 service = btstack_memory_l2cap_service_get(); 1623 if (!service) { 1624 log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 1625 l2cap_emit_service_registered(connection, BTSTACK_MEMORY_ALLOC_FAILED, psm); 1626 return; 1627 } 1628 1629 // fill in 1630 service->psm = psm; 1631 service->mtu = mtu; 1632 service->mps = mps; 1633 service->connection = connection; 1634 service->packet_handler = packet_handler; 1635 service->required_security_level = security_level; 1636 1637 // add to services list 1638 linked_list_add(&l2cap_le_services, (linked_item_t *) service); 1639 1640 // done 1641 l2cap_emit_service_registered(connection, 0, psm); 1642 } 1643 1644 void l2cap_le_unregister_service_internal(void * connection, uint16_t psm) { 1645 1646 log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 1647 1648 l2cap_service_t *service = l2cap_le_get_service(psm); 1649 if (!service) return; 1650 linked_list_remove(&l2cap_le_services, (linked_item_t *) service); 1651 btstack_memory_l2cap_service_free(service); 1652 } 1653 #endif 1654