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