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 #define BTSTACK_FILE__ "rfcomm.c" 39 40 /* 41 * rfcomm.c 42 */ 43 44 #include <string.h> // memcpy 45 #include <stdint.h> 46 47 #include "bluetooth_sdp.h" 48 #include "btstack_debug.h" 49 #include "btstack_event.h" 50 #include "btstack_memory.h" 51 #include "btstack_util.h" 52 #include "classic/core.h" 53 #include "classic/rfcomm.h" 54 #include "hci.h" 55 #include "hci_cmd.h" 56 #include "hci_dump.h" 57 #include "l2cap.h" 58 59 // workaround for missing PRIxPTR on mspgcc (16/20-bit MCU) 60 #ifndef PRIxPTR 61 #if defined(__MSP430X__) && defined(__MSP430X_LARGE__) 62 #define PRIxPTR "lx" 63 #else 64 #define PRIxPTR "x" 65 #endif 66 #endif 67 68 // ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM requires ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE 69 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM 70 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE 71 #define RFCOMM_USE_OUTGOING_BUFFER 72 #define RFCOMM_USE_ERTM 73 #else 74 #error "ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM requires ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE. " 75 #error "Please disable ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM, or, " 76 #error "enable ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE" 77 #endif 78 #endif 79 80 #define RFCOMM_MULIPLEXER_TIMEOUT_MS 60000 81 82 #define RFCOMM_CREDITS 10 83 84 // FCS calc 85 #define BT_RFCOMM_CODE_WORD 0xE0 // pol = x8+x2+x1+1 86 #define BT_RFCOMM_CRC_CHECK_LEN 3 87 #define BT_RFCOMM_UIHCRC_CHECK_LEN 2 88 89 // Control field values bit no. 1 2 3 4 PF 6 7 8 90 #define BT_RFCOMM_SABM 0x3F // 1 1 1 1 1 1 0 0 91 #define BT_RFCOMM_UA 0x73 // 1 1 0 0 1 1 1 0 92 #define BT_RFCOMM_DM 0x0F // 1 1 1 1 0 0 0 0 93 #define BT_RFCOMM_DM_PF 0x1F // 1 1 1 1 1 0 0 0 94 #define BT_RFCOMM_DISC 0x53 // 1 1 0 0 1 0 1 0 95 #define BT_RFCOMM_UIH 0xEF // 1 1 1 1 0 1 1 1 96 #define BT_RFCOMM_UIH_PF 0xFF // 1 1 1 1 0 1 1 1 97 98 // Multiplexer message types 99 #define BT_RFCOMM_CLD_CMD 0xC3 100 #define BT_RFCOMM_FCON_CMD 0xA3 101 #define BT_RFCOMM_FCON_RSP 0xA1 102 #define BT_RFCOMM_FCOFF_CMD 0x63 103 #define BT_RFCOMM_FCOFF_RSP 0x61 104 #define BT_RFCOMM_MSC_CMD 0xE3 105 #define BT_RFCOMM_MSC_RSP 0xE1 106 #define BT_RFCOMM_NSC_RSP 0x11 107 #define BT_RFCOMM_PN_CMD 0x83 108 #define BT_RFCOMM_PN_RSP 0x81 109 #define BT_RFCOMM_RLS_CMD 0x53 110 #define BT_RFCOMM_RLS_RSP 0x51 111 #define BT_RFCOMM_RPN_CMD 0x93 112 #define BT_RFCOMM_RPN_RSP 0x91 113 #define BT_RFCOMM_TEST_CMD 0x23 114 #define BT_RFCOMM_TEST_RSP 0x21 115 116 typedef enum { 117 CH_EVT_RCVD_SABM = 1, 118 CH_EVT_RCVD_UA, 119 CH_EVT_RCVD_PN, 120 CH_EVT_RCVD_PN_RSP, 121 CH_EVT_RCVD_DISC, 122 CH_EVT_RCVD_DM, 123 CH_EVT_RCVD_MSC_CMD, 124 CH_EVT_RCVD_MSC_RSP, 125 CH_EVT_RCVD_NSC_RSP, 126 CH_EVT_RCVD_RLS_CMD, 127 CH_EVT_RCVD_RLS_RSP, 128 CH_EVT_RCVD_RPN_CMD, 129 CH_EVT_RCVD_RPN_REQ, 130 CH_EVT_RCVD_CREDITS, 131 CH_EVT_MULTIPLEXER_READY, 132 CH_EVT_READY_TO_SEND, 133 } RFCOMM_CHANNEL_EVENT; 134 135 typedef struct rfcomm_channel_event { 136 RFCOMM_CHANNEL_EVENT type; 137 uint16_t dummy; // force rfcomm_channel_event to be 2-byte aligned -> avoid -Wcast-align warning 138 } rfcomm_channel_event_t; 139 140 typedef struct rfcomm_channel_event_pn { 141 rfcomm_channel_event_t super; 142 uint16_t max_frame_size; 143 uint8_t priority; 144 uint8_t credits_outgoing; 145 } rfcomm_channel_event_pn_t; 146 147 typedef struct rfcomm_channel_event_rpn { 148 rfcomm_channel_event_t super; 149 rfcomm_rpn_data_t data; 150 } rfcomm_channel_event_rpn_t; 151 152 typedef struct rfcomm_channel_event_rls { 153 rfcomm_channel_event_t super; 154 uint8_t line_status; 155 } rfcomm_channel_event_rls_t; 156 157 typedef struct rfcomm_channel_event_msc { 158 rfcomm_channel_event_t super; 159 uint8_t modem_status; 160 } rfcomm_channel_event_msc_t; 161 162 163 // global rfcomm data 164 static uint16_t rfcomm_client_cid_generator; // used for client channel IDs 165 166 // linked lists for all 167 static btstack_linked_list_t rfcomm_multiplexers = NULL; 168 static btstack_linked_list_t rfcomm_channels = NULL; 169 static btstack_linked_list_t rfcomm_services = NULL; 170 171 static gap_security_level_t rfcomm_security_level; 172 173 #ifdef RFCOMM_USE_ERTM 174 static uint16_t rfcomm_ertm_id; 175 void (*rfcomm_ertm_request_callback)(rfcomm_ertm_request_t * request); 176 void (*rfcomm_ertm_released_callback)(uint16_t ertm_id); 177 #endif 178 179 #ifdef RFCOMM_USE_OUTGOING_BUFFER 180 static uint8_t outgoing_buffer[1030]; 181 #endif 182 183 static int rfcomm_channel_can_send(rfcomm_channel_t * channel); 184 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel); 185 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel); 186 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid); 187 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event); 188 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel); 189 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer); 190 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event); 191 192 // MARK: RFCOMM CLIENT EVENTS 193 194 static rfcomm_channel_t * rfcomm_channel_for_rfcomm_cid(uint16_t rfcomm_cid){ 195 btstack_linked_item_t *it; 196 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 197 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 198 if (channel->rfcomm_cid == rfcomm_cid) { 199 return channel; 200 }; 201 } 202 return NULL; 203 } 204 205 static uint16_t rfcomm_next_client_cid(void){ 206 do { 207 if (rfcomm_client_cid_generator == 0xffff) { 208 // don't use 0 as channel id 209 rfcomm_client_cid_generator = 1; 210 } else { 211 rfcomm_client_cid_generator++; 212 } 213 } while (rfcomm_channel_for_rfcomm_cid(rfcomm_client_cid_generator) != NULL); 214 return rfcomm_client_cid_generator; 215 } 216 217 #ifdef RFCOMM_USE_ERTM 218 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_ertm_id(uint16_t ertm_id) { 219 btstack_linked_item_t *it; 220 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 221 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 222 if (multiplexer->ertm_id == ertm_id) { 223 return multiplexer; 224 }; 225 } 226 return NULL; 227 } 228 229 static uint16_t rfcomm_next_ertm_id(void){ 230 do { 231 if (rfcomm_ertm_id == 0xffff) { 232 // don't use 0 as channel id 233 rfcomm_ertm_id = 1; 234 } else { 235 rfcomm_ertm_id++; 236 } 237 } while (rfcomm_multiplexer_for_ertm_id(rfcomm_ertm_id) != NULL); 238 return rfcomm_ertm_id; 239 } 240 241 #endif 242 243 // data: event (8), len(8), address(48), channel (8), rfcomm_cid (16) 244 static void rfcomm_emit_connection_request(rfcomm_channel_t *channel) { 245 log_info("RFCOMM_EVENT_INCOMING_CONNECTION addr %s channel #%u cid 0x%02x", 246 bd_addr_to_str(channel->multiplexer->remote_addr), channel->dlci>>1, channel->rfcomm_cid); 247 uint8_t event[11]; 248 event[0] = RFCOMM_EVENT_INCOMING_CONNECTION; 249 event[1] = sizeof(event) - 2; 250 reverse_bd_addr(channel->multiplexer->remote_addr, &event[2]); 251 event[8] = channel->dlci >> 1; 252 little_endian_store_16(event, 9, channel->rfcomm_cid); 253 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 254 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 255 } 256 257 // API Change: BTstack-0.3.50x uses 258 // data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16) 259 // next Cydia release will use SVN version of this 260 // data: event(8), len(8), status (8), address (48), handle (16), server channel(8), rfcomm_cid(16), max frame size(16) 261 static void rfcomm_emit_channel_opened(rfcomm_channel_t *channel, uint8_t status) { 262 log_info("RFCOMM_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x channel #%u cid 0x%02x mtu %u", 263 status, bd_addr_to_str(channel->multiplexer->remote_addr), channel->multiplexer->con_handle, 264 channel->dlci>>1, channel->rfcomm_cid, channel->max_frame_size); 265 uint8_t event[18]; 266 uint8_t pos = 0; 267 event[pos++] = RFCOMM_EVENT_CHANNEL_OPENED; // 0 268 event[pos++] = sizeof(event) - 2; // 1 269 event[pos++] = status; // 2 270 reverse_bd_addr(channel->multiplexer->remote_addr, &event[pos]); pos += 6; // 3 271 little_endian_store_16(event, pos, channel->multiplexer->con_handle); pos += 2; // 9 272 event[pos++] = channel->dlci >> 1; // 11 273 little_endian_store_16(event, pos, channel->rfcomm_cid); pos += 2; // 12 - channel ID 274 little_endian_store_16(event, pos, channel->max_frame_size); pos += 2; // max frame size 275 event[pos++] = channel->service ? 1 : 0; // linked to service -> incoming 276 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 277 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, pos); 278 279 // if channel opened successfully, also send can send now if possible 280 if (status) return; 281 if (rfcomm_channel_can_send(channel)){ 282 rfcomm_emit_can_send_now(channel); 283 } 284 } 285 286 // data: event(8), len(8), rfcomm_cid(16) 287 static void rfcomm_emit_channel_closed(rfcomm_channel_t * channel) { 288 log_info("RFCOMM_EVENT_CHANNEL_CLOSED cid 0x%02x", channel->rfcomm_cid); 289 uint8_t event[4]; 290 event[0] = RFCOMM_EVENT_CHANNEL_CLOSED; 291 event[1] = sizeof(event) - 2; 292 little_endian_store_16(event, 2, channel->rfcomm_cid); 293 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 294 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 295 } 296 297 static void rfcomm_emit_remote_line_status(rfcomm_channel_t *channel, uint8_t line_status){ 298 log_info("RFCOMM_EVENT_REMOTE_LINE_STATUS cid 0x%02x c, line status 0x%x", channel->rfcomm_cid, line_status); 299 uint8_t event[5]; 300 event[0] = RFCOMM_EVENT_REMOTE_LINE_STATUS; 301 event[1] = sizeof(event) - 2; 302 little_endian_store_16(event, 2, channel->rfcomm_cid); 303 event[4] = line_status; 304 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 305 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 306 } 307 308 static void rfcomm_emit_port_configuration(rfcomm_channel_t *channel){ 309 // notify client about new settings 310 uint8_t event[2+sizeof(rfcomm_rpn_data_t)]; 311 event[0] = RFCOMM_EVENT_PORT_CONFIGURATION; 312 event[1] = sizeof(rfcomm_rpn_data_t); 313 (void)memcpy(&event[2], (uint8_t *)&channel->rpn_data, 314 sizeof(rfcomm_rpn_data_t)); 315 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 316 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 317 } 318 319 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel) { 320 log_debug("RFCOMM_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel->rfcomm_cid); 321 uint8_t event[4]; 322 event[0] = RFCOMM_EVENT_CAN_SEND_NOW; 323 event[1] = sizeof(event) - 2; 324 little_endian_store_16(event, 2, channel->rfcomm_cid); 325 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 326 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 327 } 328 329 // MARK RFCOMM RPN DATA HELPER 330 static void rfcomm_rpn_data_set_defaults(rfcomm_rpn_data_t * rpn_data){ 331 rpn_data->baud_rate = RPN_BAUD_9600; /* 9600 bps */ 332 rpn_data->flags = 0x03; /* 8-n-1 */ 333 rpn_data->flow_control = 0; /* no flow control */ 334 rpn_data->xon = 0xd1; /* XON */ 335 rpn_data->xoff = 0xd3; /* XOFF */ 336 rpn_data->parameter_mask_0 = 0x7f; /* parameter mask, all values set */ 337 rpn_data->parameter_mask_1 = 0x3f; /* parameter mask, all values set */ 338 } 339 340 static void rfcomm_rpn_data_update(rfcomm_rpn_data_t * dest, rfcomm_rpn_data_t * src){ 341 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_BAUD){ 342 dest->baud_rate = src->baud_rate; 343 } 344 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_DATA_BITS){ 345 dest->flags = (dest->flags & 0xfc) | (src->flags & 0x03); 346 } 347 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_STOP_BITS){ 348 dest->flags = (dest->flags & 0xfb) | (src->flags & 0x04); 349 } 350 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY){ 351 dest->flags = (dest->flags & 0xf7) | (src->flags & 0x08); 352 } 353 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY_TYPE){ 354 dest->flags = (dest->flags & 0xfc) | (src->flags & 0x30); 355 } 356 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XON_CHAR){ 357 dest->xon = src->xon; 358 } 359 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XOFF_CHAR){ 360 dest->xoff = src->xoff; 361 } 362 int i; 363 for (i=0; i < 6 ; i++){ 364 uint8_t mask = 1 << i; 365 if (src->parameter_mask_1 & mask){ 366 dest->flags = (dest->flags & ~mask) | (src->flags & mask); 367 } 368 } 369 // always copy parameter mask, too. informative for client, needed for response 370 dest->parameter_mask_0 = src->parameter_mask_0; 371 dest->parameter_mask_1 = src->parameter_mask_1; 372 } 373 // MARK: RFCOMM MULTIPLEXER HELPER 374 375 static uint16_t rfcomm_max_frame_size_for_l2cap_mtu(uint16_t l2cap_mtu){ 376 // Assume RFCOMM header without credits and 2 byte (14 bit) length field 377 uint16_t max_frame_size = l2cap_mtu - 5; 378 log_info("rfcomm_max_frame_size_for_l2cap_mtu: %u -> %u", l2cap_mtu, max_frame_size); 379 return max_frame_size; 380 } 381 382 static void rfcomm_multiplexer_initialize(rfcomm_multiplexer_t *multiplexer){ 383 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 384 multiplexer->fcon = 1; 385 multiplexer->send_dm_for_dlci = 0; 386 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(l2cap_max_mtu()); 387 multiplexer->test_data_len = 0; 388 multiplexer->nsc_command = 0; 389 } 390 391 static rfcomm_multiplexer_t * rfcomm_multiplexer_create_for_addr(bd_addr_t addr){ 392 393 // alloc structure 394 rfcomm_multiplexer_t * multiplexer = btstack_memory_rfcomm_multiplexer_get(); 395 if (!multiplexer) return NULL; 396 397 // fill in 398 rfcomm_multiplexer_initialize(multiplexer); 399 bd_addr_copy(multiplexer->remote_addr, addr); 400 401 // add to services list 402 btstack_linked_list_add(&rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 403 404 return multiplexer; 405 } 406 407 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_addr(bd_addr_t addr){ 408 btstack_linked_item_t *it; 409 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 410 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 411 // ignore multiplexer in shutdown 412 if (multiplexer->state == RFCOMM_MULTIPLEXER_SHUTTING_DOWN) continue; 413 if (bd_addr_cmp(addr, multiplexer->remote_addr) == 0) { 414 return multiplexer; 415 }; 416 } 417 return NULL; 418 } 419 420 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_l2cap_cid(uint16_t l2cap_cid) { 421 btstack_linked_item_t *it; 422 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 423 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 424 if (multiplexer->l2cap_cid == l2cap_cid) { 425 return multiplexer; 426 }; 427 } 428 return NULL; 429 } 430 431 static int rfcomm_multiplexer_has_channels(rfcomm_multiplexer_t * multiplexer){ 432 btstack_linked_item_t *it; 433 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 434 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 435 if (channel->multiplexer == multiplexer) { 436 return 1; 437 } 438 } 439 return 0; 440 } 441 442 // MARK: RFCOMM CHANNEL HELPER 443 444 static void rfcomm_dump_channels(void){ 445 btstack_linked_item_t * it; 446 int channels = 0; 447 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 448 rfcomm_channel_t * channel = (rfcomm_channel_t *) it; 449 log_info("Channel #%u: addr %p, state %u", channels, channel, channel->state); 450 channels++; 451 } 452 } 453 454 static void rfcomm_channel_initialize(rfcomm_channel_t *channel, rfcomm_multiplexer_t *multiplexer, 455 rfcomm_service_t *service, uint8_t server_channel){ 456 457 // set defaults for port configuration (even for services) 458 rfcomm_rpn_data_set_defaults(&channel->rpn_data); 459 460 channel->state = RFCOMM_CHANNEL_CLOSED; 461 channel->state_var = RFCOMM_CHANNEL_STATE_VAR_NONE; 462 463 channel->multiplexer = multiplexer; 464 channel->rfcomm_cid = rfcomm_next_client_cid(); 465 channel->max_frame_size = multiplexer->max_frame_size; 466 467 channel->credits_incoming = 0; 468 channel->credits_outgoing = 0; 469 470 // incoming flow control not active 471 channel->new_credits_incoming = RFCOMM_CREDITS; 472 channel->incoming_flow_control = 0; 473 474 channel->rls_line_status = RFCOMM_RLS_STATUS_INVALID; 475 476 channel->service = service; 477 if (service) { 478 // incoming connection 479 channel->dlci = (server_channel << 1) | multiplexer->outgoing; 480 if (channel->max_frame_size > service->max_frame_size) { 481 channel->max_frame_size = service->max_frame_size; 482 } 483 channel->incoming_flow_control = service->incoming_flow_control; 484 channel->new_credits_incoming = service->incoming_initial_credits; 485 channel->packet_handler = service->packet_handler; 486 } else { 487 // outgoing connection 488 channel->dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 489 } 490 } 491 492 // service == NULL -> outgoing channel 493 static rfcomm_channel_t * rfcomm_channel_create(rfcomm_multiplexer_t * multiplexer, 494 rfcomm_service_t * service, uint8_t server_channel){ 495 496 log_info("rfcomm_channel_create for service %p, channel %u --- list of channels:", service, server_channel); 497 rfcomm_dump_channels(); 498 499 // alloc structure 500 rfcomm_channel_t * channel = btstack_memory_rfcomm_channel_get(); 501 if (!channel) return NULL; 502 503 // fill in 504 rfcomm_channel_initialize(channel, multiplexer, service, server_channel); 505 506 // add to services list 507 btstack_linked_list_add(&rfcomm_channels, (btstack_linked_item_t *) channel); 508 509 return channel; 510 } 511 512 static void rfcomm_notify_channel_can_send(void){ 513 btstack_linked_list_iterator_t it; 514 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 515 while (btstack_linked_list_iterator_has_next(&it)){ 516 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 517 if (!channel->waiting_for_can_send_now) continue; // didn't try to send yet 518 if (!rfcomm_channel_can_send(channel)) continue; // or cannot yet either 519 520 channel->waiting_for_can_send_now = 0; 521 rfcomm_emit_can_send_now(channel); 522 } 523 } 524 525 static rfcomm_channel_t * rfcomm_channel_for_multiplexer_and_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci){ 526 btstack_linked_item_t *it; 527 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 528 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 529 if ((channel->dlci == dlci) && (channel->multiplexer == multiplexer)) { 530 return channel; 531 }; 532 } 533 return NULL; 534 } 535 536 static rfcomm_service_t * rfcomm_service_for_channel(uint8_t server_channel){ 537 btstack_linked_item_t *it; 538 for (it = (btstack_linked_item_t *) rfcomm_services; it ; it = it->next){ 539 rfcomm_service_t * service = ((rfcomm_service_t *) it); 540 if ( service->server_channel == server_channel){ 541 return service; 542 }; 543 } 544 return NULL; 545 } 546 547 // MARK: RFCOMM SEND 548 549 /** 550 * @param credits - only used for RFCOMM flow control in UIH wiht P/F = 1 551 */ 552 static int rfcomm_send_packet_for_multiplexer(rfcomm_multiplexer_t *multiplexer, uint8_t address, uint8_t control, uint8_t credits, uint8_t *data, uint16_t len){ 553 554 if (!l2cap_can_send_packet_now(multiplexer->l2cap_cid)) return BTSTACK_ACL_BUFFERS_FULL; 555 556 #ifdef RFCOMM_USE_OUTGOING_BUFFER 557 uint8_t * rfcomm_out_buffer = outgoing_buffer; 558 #else 559 l2cap_reserve_packet_buffer(); 560 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 561 #endif 562 563 uint16_t pos = 0; 564 uint8_t crc_fields = 3; 565 566 rfcomm_out_buffer[pos++] = address; 567 rfcomm_out_buffer[pos++] = control; 568 569 // length field can be 1 or 2 octets 570 if (len < 128){ 571 rfcomm_out_buffer[pos++] = (len << 1)| 1; // bits 0-6 572 } else { 573 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 574 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 575 crc_fields++; 576 } 577 578 // add credits for UIH frames when PF bit is set 579 if (control == BT_RFCOMM_UIH_PF){ 580 rfcomm_out_buffer[pos++] = credits; 581 } 582 583 // copy actual data 584 if (len) { 585 (void)memcpy(&rfcomm_out_buffer[pos], data, len); 586 pos += len; 587 } 588 589 // UIH frames only calc FCS over address + control (5.1.1) 590 if ((control & 0xef) == BT_RFCOMM_UIH){ 591 crc_fields = 2; 592 } 593 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, crc_fields); // calc fcs 594 595 #ifdef RFCOMM_USE_OUTGOING_BUFFER 596 int err = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 597 #else 598 int err = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 599 #endif 600 601 return err; 602 } 603 604 // simplified version of rfcomm_send_packet_for_multiplexer for prepared rfcomm packet (UIH, 2 byte len, no credits) 605 static int rfcomm_send_uih_prepared(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t len){ 606 607 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 608 uint8_t control = BT_RFCOMM_UIH; 609 610 #ifdef RFCOMM_USE_OUTGOING_BUFFER 611 uint8_t * rfcomm_out_buffer = outgoing_buffer; 612 #else 613 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 614 #endif 615 616 uint16_t pos = 0; 617 rfcomm_out_buffer[pos++] = address; 618 rfcomm_out_buffer[pos++] = control; 619 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 620 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 621 622 // actual data is already in place 623 pos += len; 624 625 // UIH frames only calc FCS over address + control (5.1.1) 626 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, 2); // calc fcs 627 628 #ifdef RFCOMM_USE_OUTGOING_BUFFER 629 int err = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 630 #else 631 int err = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 632 #endif 633 634 return err; 635 } 636 637 // C/R Flag in Address 638 // - terms: initiator = station that creates multiplexer with SABM 639 // - terms: responder = station that responds to multiplexer setup with UA 640 // "For SABM, UA, DM and DISC frames C/R bit is set according to Table 1 in GSM 07.10, section 5.2.1.2" 641 // - command initiator = 1 /response responder = 1 642 // - command responder = 0 /response initiator = 0 643 // "For UIH frames, the C/R bit is always set according to section 5.4.3.1 in GSM 07.10. 644 // This applies independently of what is contained wthin the UIH frames, either data or control messages." 645 // - c/r = 1 for frames by initiating station, 0 = for frames by responding station 646 647 // C/R Flag in Message 648 // "In the message level, the C/R bit in the command type field is set as stated in section 5.4.6.2 in GSM 07.10." 649 // - If the C/R bit is set to 1 the message is a command 650 // - if it is set to 0 the message is a response. 651 652 // temp/old messge construction 653 654 // new object oriented version 655 static int rfcomm_send_sabm(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 656 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 657 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_SABM, 0, NULL, 0); 658 } 659 660 static int rfcomm_send_disc(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 661 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 662 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DISC, 0, NULL, 0); 663 } 664 665 static int rfcomm_send_ua(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 666 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 667 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UA, 0, NULL, 0); 668 } 669 670 static int rfcomm_send_dm_pf(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 671 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 672 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DM_PF, 0, NULL, 0); 673 } 674 675 static int rfcomm_send_uih_fc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t fcon) { 676 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 677 uint8_t payload[2]; 678 uint8_t pos = 0; 679 payload[pos++] = fcon ? BT_RFCOMM_FCON_RSP : BT_RFCOMM_FCOFF_RSP; 680 payload[pos++] = (0 << 1) | 1; // len 681 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 682 } 683 684 // static int rfcomm_send_uih_test_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 685 // uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 686 // uint8_t payload[2+len]; 687 // uint8_t pos = 0; 688 // payload[pos++] = BT_RFCOMM_TEST_CMD; 689 // payload[pos++] = (len + 1) << 1 | 1; // len 690 // memcpy(&payload[pos], data, len); 691 // pos += len; 692 // return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 693 // } 694 695 static int rfcomm_send_uih_test_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 696 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 697 uint8_t payload[2+RFCOMM_TEST_DATA_MAX_LEN]; 698 uint8_t pos = 0; 699 payload[pos++] = BT_RFCOMM_TEST_RSP; 700 if (len > RFCOMM_TEST_DATA_MAX_LEN) { 701 len = RFCOMM_TEST_DATA_MAX_LEN; 702 } 703 payload[pos++] = (len << 1) | 1; // len 704 (void)memcpy(&payload[pos], data, len); 705 pos += len; 706 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 707 } 708 709 static int rfcomm_send_uih_msc_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 710 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 711 uint8_t payload[4]; 712 uint8_t pos = 0; 713 payload[pos++] = BT_RFCOMM_MSC_CMD; 714 payload[pos++] = (2 << 1) | 1; // len 715 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 716 payload[pos++] = signals; 717 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 718 } 719 720 static int rfcomm_send_uih_msc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 721 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 722 uint8_t payload[4]; 723 uint8_t pos = 0; 724 payload[pos++] = BT_RFCOMM_MSC_RSP; 725 payload[pos++] = (2 << 1) | 1; // len 726 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 727 payload[pos++] = signals; 728 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 729 } 730 731 static int rfcomm_send_uih_nsc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t command) { 732 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 733 uint8_t payload[3]; 734 uint8_t pos = 0; 735 payload[pos++] = BT_RFCOMM_NSC_RSP; 736 payload[pos++] = (1 << 1) | 1; // len 737 payload[pos++] = command; 738 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 739 } 740 741 static int rfcomm_send_uih_pn_command(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t max_frame_size){ 742 uint8_t payload[10]; 743 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 744 uint8_t pos = 0; 745 payload[pos++] = BT_RFCOMM_PN_CMD; 746 payload[pos++] = (8 << 1) | 1; // len 747 payload[pos++] = dlci; 748 payload[pos++] = 0xf0; // pre-defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 749 payload[pos++] = 0; // priority 750 payload[pos++] = 0; // max 60 seconds ack 751 payload[pos++] = max_frame_size & 0xff; // max framesize low 752 payload[pos++] = max_frame_size >> 8; // max framesize high 753 payload[pos++] = 0x00; // number of retransmissions 754 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 755 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 756 } 757 758 // "The response may not change the DLCI, the priority, the convergence layer, or the timer value." rfcomm_tutorial.pdf 759 static int rfcomm_send_uih_pn_response(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, 760 uint8_t priority, uint16_t max_frame_size){ 761 uint8_t payload[10]; 762 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 763 uint8_t pos = 0; 764 payload[pos++] = BT_RFCOMM_PN_RSP; 765 payload[pos++] = (8 << 1) | 1; // len 766 payload[pos++] = dlci; 767 payload[pos++] = 0xe0; // pre defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 768 payload[pos++] = priority; // priority 769 payload[pos++] = 0; // max 60 seconds ack 770 payload[pos++] = max_frame_size & 0xff; // max framesize low 771 payload[pos++] = max_frame_size >> 8; // max framesize high 772 payload[pos++] = 0x00; // number of retransmissions 773 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 774 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 775 } 776 777 static int rfcomm_send_uih_rls_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 778 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 779 uint8_t payload[4]; 780 uint8_t pos = 0; 781 payload[pos++] = BT_RFCOMM_RLS_CMD; 782 payload[pos++] = (2 << 1) | 1; // len 783 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 784 payload[pos++] = line_status; 785 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 786 } 787 788 static int rfcomm_send_uih_rls_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 789 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 790 uint8_t payload[4]; 791 uint8_t pos = 0; 792 payload[pos++] = BT_RFCOMM_RLS_RSP; 793 payload[pos++] = (2 << 1) | 1; // len 794 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 795 payload[pos++] = line_status; 796 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 797 } 798 799 static int rfcomm_send_uih_rpn_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 800 uint8_t payload[10]; 801 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 802 uint8_t pos = 0; 803 payload[pos++] = BT_RFCOMM_RPN_CMD; 804 payload[pos++] = (8 << 1) | 1; // len 805 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 806 payload[pos++] = rpn_data->baud_rate; 807 payload[pos++] = rpn_data->flags; 808 payload[pos++] = rpn_data->flow_control; 809 payload[pos++] = rpn_data->xon; 810 payload[pos++] = rpn_data->xoff; 811 payload[pos++] = rpn_data->parameter_mask_0; 812 payload[pos++] = rpn_data->parameter_mask_1; 813 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 814 } 815 816 static int rfcomm_send_uih_rpn_req(rfcomm_multiplexer_t *multiplexer, uint8_t dlci) { 817 uint8_t payload[3]; 818 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 819 uint8_t pos = 0; 820 payload[pos++] = BT_RFCOMM_RPN_CMD; 821 payload[pos++] = (1 << 1) | 1; // len 822 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 823 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 824 } 825 826 static int rfcomm_send_uih_rpn_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 827 uint8_t payload[10]; 828 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 829 uint8_t pos = 0; 830 payload[pos++] = BT_RFCOMM_RPN_RSP; 831 payload[pos++] = (8 << 1) | 1; // len 832 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 833 payload[pos++] = rpn_data->baud_rate; 834 payload[pos++] = rpn_data->flags; 835 payload[pos++] = rpn_data->flow_control; 836 payload[pos++] = rpn_data->xon; 837 payload[pos++] = rpn_data->xoff; 838 payload[pos++] = rpn_data->parameter_mask_0; 839 payload[pos++] = rpn_data->parameter_mask_1; 840 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 841 } 842 843 static void rfcomm_send_uih_credits(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t credits){ 844 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 845 rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH_PF, credits, NULL, 0); 846 } 847 848 // depending on channel state emit channel opened with status or channel closed 849 static void rfcomm_channel_emit_final_event(rfcomm_channel_t * channel, uint8_t status){ 850 // emit appropriate events 851 switch(channel->state){ 852 case RFCOMM_CHANNEL_OPEN: 853 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 854 rfcomm_emit_channel_closed(channel); 855 break; 856 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 857 // remote didn't wait until we send the UA disc 858 // close event already emitted 859 break; 860 default: 861 rfcomm_emit_channel_opened(channel, status); 862 break; 863 } 864 } 865 866 // MARK: RFCOMM MULTIPLEXER 867 static void rfcomm_multiplexer_stop_timer(rfcomm_multiplexer_t * multiplexer){ 868 if (multiplexer->timer_active) { 869 btstack_run_loop_remove_timer(&multiplexer->timer); 870 multiplexer->timer_active = 0; 871 } 872 } 873 static void rfcomm_multiplexer_free(rfcomm_multiplexer_t * multiplexer){ 874 btstack_linked_list_remove( &rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 875 btstack_memory_rfcomm_multiplexer_free(multiplexer); 876 } 877 878 static void rfcomm_multiplexer_finalize(rfcomm_multiplexer_t * multiplexer){ 879 // remove (potential) timer 880 rfcomm_multiplexer_stop_timer(multiplexer); 881 882 // close and remove all channels 883 btstack_linked_item_t *it = (btstack_linked_item_t *) &rfcomm_channels; 884 while (it->next){ 885 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 886 if (channel->multiplexer == multiplexer) { 887 // emit open with status or closed 888 rfcomm_channel_emit_final_event(channel, RFCOMM_MULTIPLEXER_STOPPED); 889 // remove from list 890 it->next = it->next->next; 891 // free channel struct 892 btstack_memory_rfcomm_channel_free(channel); 893 } else { 894 it = it->next; 895 } 896 } 897 898 // remove mutliplexer 899 rfcomm_multiplexer_free(multiplexer); 900 } 901 902 static void rfcomm_multiplexer_timer_handler(btstack_timer_source_t *timer){ 903 rfcomm_multiplexer_t * multiplexer = (rfcomm_multiplexer_t*) btstack_run_loop_get_timer_context(timer); 904 if (rfcomm_multiplexer_has_channels(multiplexer)) return; 905 906 log_info("rfcomm_multiplexer_timer_handler timeout: shutting down multiplexer! (no channels)"); 907 uint16_t l2cap_cid = multiplexer->l2cap_cid; 908 rfcomm_multiplexer_finalize(multiplexer); 909 l2cap_disconnect(l2cap_cid, 0x13); 910 } 911 912 static void rfcomm_multiplexer_prepare_idle_timer(rfcomm_multiplexer_t * multiplexer){ 913 if (multiplexer->timer_active) { 914 btstack_run_loop_remove_timer(&multiplexer->timer); 915 multiplexer->timer_active = 0; 916 } 917 if (rfcomm_multiplexer_has_channels(multiplexer)) return; 918 919 // start idle timer for multiplexer timeout check as there are no rfcomm channels yet 920 btstack_run_loop_set_timer(&multiplexer->timer, RFCOMM_MULIPLEXER_TIMEOUT_MS); 921 btstack_run_loop_set_timer_handler(&multiplexer->timer, rfcomm_multiplexer_timer_handler); 922 btstack_run_loop_set_timer_context(&multiplexer->timer, multiplexer); 923 btstack_run_loop_add_timer(&multiplexer->timer); 924 multiplexer->timer_active = 1; 925 } 926 927 static void rfcomm_multiplexer_opened(rfcomm_multiplexer_t *multiplexer){ 928 log_info("Multiplexer up and running"); 929 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 930 931 const rfcomm_channel_event_t event = { CH_EVT_MULTIPLEXER_READY, 0}; 932 933 // transition of channels that wait for multiplexer 934 btstack_linked_item_t *it; 935 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 936 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 937 if (channel->multiplexer != multiplexer) continue; 938 int rfcomm_channel_valid = 1; 939 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 940 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 941 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 942 } 943 } 944 rfcomm_multiplexer_prepare_idle_timer(multiplexer); 945 946 // request can send now for multiplexer if ready 947 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 948 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 949 } 950 } 951 952 static void rfcomm_handle_can_send_now(uint16_t l2cap_cid){ 953 954 log_debug("rfcomm_handle_can_send_now enter: %u", l2cap_cid); 955 956 btstack_linked_list_iterator_t it; 957 int token_consumed = 0; 958 959 // forward token to multiplexer 960 btstack_linked_list_iterator_init(&it, &rfcomm_multiplexers); 961 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 962 rfcomm_multiplexer_t * multiplexer = (rfcomm_multiplexer_t *) btstack_linked_list_iterator_next(&it); 963 if (multiplexer->l2cap_cid != l2cap_cid) continue; 964 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 965 log_debug("rfcomm_handle_can_send_now enter: multiplexer token"); 966 token_consumed = 1; 967 rfcomm_multiplexer_state_machine(multiplexer, MULT_EV_READY_TO_SEND); 968 } 969 } 970 971 // forward token to channel state machine 972 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 973 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 974 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 975 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 976 // channel state machine 977 if (rfcomm_channel_ready_to_send(channel)){ 978 log_debug("rfcomm_handle_can_send_now enter: channel token"); 979 token_consumed = 1; 980 const rfcomm_channel_event_t event = { CH_EVT_READY_TO_SEND, 0 }; 981 int rfcomm_channel_valid = 1; 982 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 983 } 984 } 985 986 // forward token to client 987 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 988 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 989 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 990 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 991 // client waiting for can send now 992 if (!channel->waiting_for_can_send_now) continue; 993 if ((channel->multiplexer->fcon & 1) == 0) continue; 994 if (!channel->credits_outgoing){ 995 log_debug("rfcomm_handle_can_send_now waiting to send but no credits (ignore)"); 996 continue; 997 } 998 999 log_debug("rfcomm_handle_can_send_now enter: client token"); 1000 token_consumed = 1; 1001 channel->waiting_for_can_send_now = 0; 1002 rfcomm_emit_can_send_now(channel); 1003 } 1004 1005 // if token was consumed, request another one 1006 if (token_consumed) { 1007 l2cap_request_can_send_now_event(l2cap_cid); 1008 } 1009 1010 log_debug("rfcomm_handle_can_send_now exit"); 1011 } 1012 1013 static void rfcomm_multiplexer_set_state_and_request_can_send_now_event(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_STATE state){ 1014 multiplexer->state = state; 1015 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1016 } 1017 1018 /** 1019 * @return handled packet 1020 */ 1021 static int rfcomm_hci_event_handler(uint8_t *packet, uint16_t size){ 1022 1023 UNUSED(size); // ok: handling own l2cap events 1024 1025 bd_addr_t event_addr; 1026 uint16_t psm; 1027 uint16_t l2cap_cid; 1028 hci_con_handle_t con_handle; 1029 rfcomm_multiplexer_t *multiplexer = NULL; 1030 uint8_t status; 1031 1032 switch (hci_event_packet_get_type(packet)) { 1033 1034 // accept incoming rfcomm connection if no multiplexer exists yet 1035 case L2CAP_EVENT_INCOMING_CONNECTION: 1036 // data: event(8), len(8), address(48), handle (16), psm (16), source cid(16) dest cid(16) 1037 reverse_bd_addr(&packet[2], event_addr); 1038 con_handle = little_endian_read_16(packet, 8); 1039 psm = little_endian_read_16(packet, 10); 1040 l2cap_cid = little_endian_read_16(packet, 12); 1041 1042 if (psm != BLUETOOTH_PROTOCOL_RFCOMM) break; 1043 1044 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1045 1046 if (multiplexer) { 1047 log_info("INCOMING_CONNECTION (l2cap_cid 0x%02x) for BLUETOOTH_PROTOCOL_RFCOMM => decline - multiplexer already exists", l2cap_cid); 1048 l2cap_decline_connection(l2cap_cid); 1049 return 1; 1050 } 1051 1052 // create and inititialize new multiplexer instance (incoming) 1053 multiplexer = rfcomm_multiplexer_create_for_addr(event_addr); 1054 if (!multiplexer){ 1055 log_info("INCOMING_CONNECTION (l2cap_cid 0x%02x) for BLUETOOTH_PROTOCOL_RFCOMM => decline - no memory left", l2cap_cid); 1056 l2cap_decline_connection(l2cap_cid); 1057 return 1; 1058 } 1059 1060 multiplexer->con_handle = con_handle; 1061 multiplexer->l2cap_cid = l2cap_cid; 1062 // 1063 multiplexer->state = RFCOMM_MULTIPLEXER_W4_SABM_0; 1064 log_info("L2CAP_EVENT_INCOMING_CONNECTION (l2cap_cid 0x%02x) for BLUETOOTH_PROTOCOL_RFCOMM => accept", l2cap_cid); 1065 1066 #ifdef RFCOMM_USE_ERTM 1067 // request 1068 rfcomm_ertm_request_t request; 1069 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 1070 (void)memcpy(request.addr, event_addr, 6); 1071 request.ertm_id = rfcomm_next_ertm_id(); 1072 if (rfcomm_ertm_request_callback){ 1073 (*rfcomm_ertm_request_callback)(&request); 1074 } 1075 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 1076 multiplexer->ertm_id = request.ertm_id; 1077 l2cap_accept_ertm_connection(l2cap_cid, request.ertm_config, request.ertm_buffer, request.ertm_buffer_size); 1078 return 1; 1079 } 1080 #endif 1081 1082 l2cap_accept_connection(l2cap_cid); 1083 return 1; 1084 1085 // l2cap connection opened -> store l2cap_cid, remote_addr 1086 case L2CAP_EVENT_CHANNEL_OPENED: 1087 1088 if (little_endian_read_16(packet, 11) != BLUETOOTH_PROTOCOL_RFCOMM) break; 1089 1090 status = packet[2]; 1091 log_info("L2CAP_EVENT_CHANNEL_OPENED for BLUETOOTH_PROTOCOL_RFCOMM, status %u", status); 1092 1093 // get multiplexer for remote addr 1094 con_handle = little_endian_read_16(packet, 9); 1095 l2cap_cid = little_endian_read_16(packet, 13); 1096 reverse_bd_addr(&packet[3], event_addr); 1097 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1098 if (!multiplexer) { 1099 log_error("L2CAP_EVENT_CHANNEL_OPENED but no multiplexer prepared"); 1100 return 1; 1101 } 1102 1103 // on l2cap open error discard everything 1104 if (status){ 1105 1106 // remove (potential) timer 1107 rfcomm_multiplexer_stop_timer(multiplexer); 1108 1109 // mark multiplexer as shutting down 1110 multiplexer->state = RFCOMM_MULTIPLEXER_SHUTTING_DOWN; 1111 1112 // emit rfcomm_channel_opened with status and free channel 1113 // note: repeatedly go over list until full iteration causes no further change 1114 int done; 1115 do { 1116 done = 1; 1117 btstack_linked_item_t * it = (btstack_linked_item_t *) &rfcomm_channels; 1118 while (it->next) { 1119 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 1120 if (channel->multiplexer == multiplexer){ 1121 done = 0; 1122 rfcomm_emit_channel_opened(channel, status); 1123 btstack_linked_list_remove(&rfcomm_channels, (btstack_linked_item_t *) channel); 1124 btstack_memory_rfcomm_channel_free(channel); 1125 break; 1126 } else { 1127 it = it->next; 1128 } 1129 } 1130 } while (!done); 1131 1132 // free multiplexer 1133 rfcomm_multiplexer_free(multiplexer); 1134 return 1; 1135 } 1136 1137 // following could be: rfcom_multiplexer_state_machein(..., EVENT_L2CAP_OPENED) 1138 1139 // set max frame size based on l2cap MTU 1140 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(little_endian_read_16(packet, 17)); 1141 1142 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_CONNECT) { 1143 log_info("L2CAP_EVENT_CHANNEL_OPENED: outgoing connection"); 1144 // wrong remote addr 1145 if (bd_addr_cmp(event_addr, multiplexer->remote_addr)) break; 1146 multiplexer->l2cap_cid = l2cap_cid; 1147 multiplexer->con_handle = con_handle; 1148 // send SABM #0 1149 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_SABM_0); 1150 1151 } 1152 return 1; 1153 1154 // l2cap disconnect -> state = RFCOMM_MULTIPLEXER_CLOSED; 1155 1156 // Notify channel packet handler if they can send now 1157 case L2CAP_EVENT_CAN_SEND_NOW: 1158 l2cap_cid = l2cap_event_can_send_now_get_local_cid(packet); 1159 rfcomm_handle_can_send_now(l2cap_cid); 1160 return 1; 1161 1162 case L2CAP_EVENT_CHANNEL_CLOSED: 1163 // data: event (8), len(8), channel (16) 1164 l2cap_cid = little_endian_read_16(packet, 2); 1165 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1166 log_info("L2CAP_EVENT_CHANNEL_CLOSED cid 0x%0x, mult %p", l2cap_cid, multiplexer); 1167 if (!multiplexer) break; 1168 log_info("L2CAP_EVENT_CHANNEL_CLOSED state %u", multiplexer->state); 1169 // no need to call l2cap_disconnect here, as it's already closed 1170 rfcomm_multiplexer_finalize(multiplexer); 1171 return 1; 1172 1173 #ifdef RFCOMM_USE_ERTM 1174 case L2CAP_EVENT_ERTM_BUFFER_RELEASED: 1175 l2cap_cid = l2cap_event_ertm_buffer_released_get_local_cid(packet); 1176 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1177 if (multiplexer) { 1178 log_info("buffer for ertm id %u released", multiplexer->ertm_id); 1179 if (rfcomm_ertm_released_callback){ 1180 (*rfcomm_ertm_released_callback)(multiplexer->ertm_id); 1181 } 1182 } 1183 break; 1184 #endif 1185 1186 default: 1187 break; 1188 } 1189 return 0; 1190 } 1191 1192 static int rfcomm_multiplexer_l2cap_packet_handler(uint16_t channel, uint8_t *packet, uint16_t size){ 1193 // get or create a multiplexer for a certain device 1194 rfcomm_multiplexer_t *multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1195 if (!multiplexer) return 0; 1196 1197 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1198 1199 // but only care for multiplexer control channel 1200 uint8_t frame_dlci = packet[0] >> 2; 1201 if (frame_dlci) return 0; 1202 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1203 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1204 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1205 switch (packet[1]){ 1206 1207 case BT_RFCOMM_SABM: 1208 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_SABM_0){ 1209 log_info("Received SABM #0"); 1210 multiplexer->outgoing = 0; 1211 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0); 1212 return 1; 1213 } 1214 break; 1215 1216 case BT_RFCOMM_UA: 1217 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_UA_0) { 1218 // UA #0 -> send UA #0, state = RFCOMM_MULTIPLEXER_OPEN 1219 log_info("Received UA #0 "); 1220 rfcomm_multiplexer_opened(multiplexer); 1221 return 1; 1222 } 1223 break; 1224 1225 case BT_RFCOMM_DISC: 1226 // DISC #0 -> send UA #0, close multiplexer 1227 log_info("Received DISC #0, (ougoing = %u)", multiplexer->outgoing); 1228 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC); 1229 return 1; 1230 1231 case BT_RFCOMM_DM: 1232 // DM #0 - we shouldn't get this, just give up 1233 log_info("Received DM #0"); 1234 log_info("-> Closing down multiplexer"); 1235 rfcomm_multiplexer_finalize(multiplexer); 1236 l2cap_disconnect(l2cap_cid, 0x13); 1237 return 1; 1238 1239 case BT_RFCOMM_UIH: 1240 if (packet[payload_offset] == BT_RFCOMM_CLD_CMD){ 1241 // Multiplexer close down (CLD) -> close mutliplexer 1242 log_info("Received Multiplexer close down command"); 1243 log_info("-> Closing down multiplexer"); 1244 rfcomm_multiplexer_finalize(multiplexer); 1245 l2cap_disconnect(l2cap_cid, 0x13); 1246 return 1; 1247 } 1248 switch (packet[payload_offset]){ 1249 case BT_RFCOMM_CLD_CMD: 1250 // Multiplexer close down (CLD) -> close mutliplexer 1251 log_info("Received Multiplexer close down command"); 1252 log_info("-> Closing down multiplexer"); 1253 rfcomm_multiplexer_finalize(multiplexer); 1254 l2cap_disconnect(l2cap_cid, 0x13); 1255 return 1; 1256 1257 case BT_RFCOMM_FCON_CMD: 1258 multiplexer->fcon = 0x81; 1259 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1260 return 1; 1261 1262 case BT_RFCOMM_FCOFF_CMD: 1263 multiplexer->fcon = 0x80; 1264 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1265 return 1; 1266 1267 case BT_RFCOMM_TEST_CMD: { 1268 log_info("Received test command"); 1269 int len = packet[payload_offset+1] >> 1; // length < 125 1270 if (len > RFCOMM_TEST_DATA_MAX_LEN){ 1271 len = RFCOMM_TEST_DATA_MAX_LEN; 1272 } 1273 len = btstack_min(len, size - 1 - payload_offset); // avoid information leak 1274 multiplexer->test_data_len = len; 1275 (void)memcpy(multiplexer->test_data, 1276 &packet[payload_offset + 2], len); 1277 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1278 return 1; 1279 } 1280 default: 1281 break; 1282 } 1283 break; 1284 1285 default: 1286 break; 1287 1288 } 1289 return 0; 1290 } 1291 1292 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer){ 1293 if (multiplexer->send_dm_for_dlci) return 1; 1294 if (multiplexer->nsc_command) return 1; 1295 if (multiplexer->fcon & 0x80) return 1; 1296 switch (multiplexer->state){ 1297 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1298 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1299 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1300 return 1; 1301 case RFCOMM_MULTIPLEXER_OPEN: 1302 if (multiplexer->test_data_len) { 1303 return 1; 1304 } 1305 break; 1306 default: 1307 break; 1308 } 1309 return 0; 1310 } 1311 1312 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event){ 1313 1314 if (event != MULT_EV_READY_TO_SEND) return; 1315 1316 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1317 1318 // process stored DM responses 1319 if (multiplexer->send_dm_for_dlci){ 1320 uint8_t dlci = multiplexer->send_dm_for_dlci; 1321 multiplexer->send_dm_for_dlci = 0; 1322 rfcomm_send_dm_pf(multiplexer, dlci); 1323 return; 1324 } 1325 1326 if (multiplexer->nsc_command){ 1327 uint8_t command = multiplexer->nsc_command; 1328 multiplexer->nsc_command = 0; 1329 rfcomm_send_uih_nsc_rsp(multiplexer, command); 1330 return; 1331 } 1332 1333 if (multiplexer->fcon & 0x80){ 1334 multiplexer->fcon &= 0x01; 1335 rfcomm_send_uih_fc_rsp(multiplexer, multiplexer->fcon); 1336 1337 if (multiplexer->fcon == 0) return; 1338 // trigger client to send again after sending FCon Response 1339 rfcomm_notify_channel_can_send(); 1340 return; 1341 } 1342 1343 switch (multiplexer->state) { 1344 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1345 log_info("Sending SABM #0 - (multi 0x%p)", multiplexer); 1346 multiplexer->state = RFCOMM_MULTIPLEXER_W4_UA_0; 1347 rfcomm_send_sabm(multiplexer, 0); 1348 break; 1349 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1350 log_info("Sending UA #0"); 1351 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 1352 rfcomm_send_ua(multiplexer, 0); 1353 1354 rfcomm_multiplexer_opened(multiplexer); 1355 break; 1356 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1357 log_info("Sending UA #0"); 1358 log_info("Closing down multiplexer"); 1359 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 1360 rfcomm_send_ua(multiplexer, 0); 1361 1362 rfcomm_multiplexer_finalize(multiplexer); 1363 l2cap_disconnect(l2cap_cid, 0x13); 1364 break; 1365 case RFCOMM_MULTIPLEXER_OPEN: 1366 // respond to test command 1367 if (multiplexer->test_data_len){ 1368 int len = multiplexer->test_data_len; 1369 log_info("Sending TEST Response with %u bytes", len); 1370 multiplexer->test_data_len = 0; 1371 rfcomm_send_uih_test_rsp(multiplexer, multiplexer->test_data, len); 1372 return; 1373 } 1374 break; 1375 default: 1376 break; 1377 } 1378 } 1379 1380 // MARK: RFCOMM CHANNEL 1381 1382 static void rfcomm_channel_send_credits(rfcomm_channel_t *channel, uint8_t credits){ 1383 channel->credits_incoming += credits; 1384 rfcomm_send_uih_credits(channel->multiplexer, channel->dlci, credits); 1385 } 1386 1387 static int rfcomm_channel_can_send(rfcomm_channel_t * channel){ 1388 if (!channel->credits_outgoing) return 0; 1389 if ((channel->multiplexer->fcon & 1) == 0) return 0; 1390 return l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid); 1391 } 1392 1393 static void rfcomm_channel_opened(rfcomm_channel_t *rfChannel){ 1394 1395 log_info("rfcomm_channel_opened!"); 1396 1397 rfChannel->state = RFCOMM_CHANNEL_OPEN; 1398 rfcomm_emit_channel_opened(rfChannel, 0); 1399 rfcomm_emit_port_configuration(rfChannel); 1400 1401 // remove (potential) timer 1402 rfcomm_multiplexer_t *multiplexer = rfChannel->multiplexer; 1403 if (multiplexer->timer_active) { 1404 btstack_run_loop_remove_timer(&multiplexer->timer); 1405 multiplexer->timer_active = 0; 1406 } 1407 // hack for problem detecting authentication failure 1408 multiplexer->at_least_one_connection = 1; 1409 1410 // request can send now if channel ready 1411 if (rfcomm_channel_ready_to_send(rfChannel)){ 1412 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1413 } 1414 } 1415 1416 static void rfcomm_channel_packet_handler_uih(rfcomm_multiplexer_t *multiplexer, uint8_t * packet, uint16_t size){ 1417 const uint8_t frame_dlci = packet[0] >> 2; 1418 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1419 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1420 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1421 int request_can_send_now = 0; 1422 1423 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, frame_dlci); 1424 if (!channel) return; 1425 1426 // handle new outgoing credits 1427 if (packet[1] == BT_RFCOMM_UIH_PF) { 1428 1429 // add them 1430 uint16_t new_credits = packet[3+length_offset]; 1431 channel->credits_outgoing += new_credits; 1432 log_info( "RFCOMM data UIH_PF, new credits channel 0x%02x: %u, now %u", channel->rfcomm_cid, new_credits, channel->credits_outgoing); 1433 1434 // notify channel statemachine 1435 rfcomm_channel_event_t channel_event = { CH_EVT_RCVD_CREDITS, 0 }; 1436 log_debug("rfcomm_channel_state_machine_with_channel, waiting_for_can_send_now %u", channel->waiting_for_can_send_now); 1437 int rfcomm_channel_valid = 1; 1438 rfcomm_channel_state_machine_with_channel(channel, &channel_event, &rfcomm_channel_valid); 1439 if (rfcomm_channel_valid){ 1440 if (rfcomm_channel_ready_to_send(channel) || channel->waiting_for_can_send_now){ 1441 request_can_send_now = 1; 1442 } 1443 } 1444 } 1445 1446 // contains payload? 1447 if ((size - 1) > payload_offset){ 1448 1449 // log_info( "RFCOMM data UIH_PF, size %u, channel %p", size-payload_offset-1, rfChannel->connection); 1450 1451 // decrease incoming credit counter 1452 if (channel->credits_incoming > 0){ 1453 channel->credits_incoming--; 1454 } 1455 1456 // deliver payload 1457 (channel->packet_handler)(RFCOMM_DATA_PACKET, channel->rfcomm_cid, 1458 &packet[payload_offset], size-payload_offset-1); 1459 } 1460 1461 // automatically provide new credits to remote device, if no incoming flow control 1462 if (!channel->incoming_flow_control && (channel->credits_incoming < 5)){ 1463 channel->new_credits_incoming = RFCOMM_CREDITS; 1464 request_can_send_now = 1; 1465 } 1466 1467 if (request_can_send_now){ 1468 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1469 } 1470 } 1471 1472 static void rfcomm_channel_accept_pn(rfcomm_channel_t *channel, rfcomm_channel_event_pn_t *event){ 1473 // priority of client request 1474 channel->pn_priority = event->priority; 1475 1476 // new credits 1477 channel->credits_outgoing = event->credits_outgoing; 1478 1479 // negotiate max frame size 1480 if (channel->max_frame_size > channel->multiplexer->max_frame_size) { 1481 channel->max_frame_size = channel->multiplexer->max_frame_size; 1482 } 1483 if (channel->max_frame_size > event->max_frame_size) { 1484 channel->max_frame_size = event->max_frame_size; 1485 } 1486 1487 } 1488 1489 static void rfcomm_channel_finalize(rfcomm_channel_t *channel){ 1490 1491 rfcomm_multiplexer_t *multiplexer = channel->multiplexer; 1492 1493 // remove from list 1494 btstack_linked_list_remove( &rfcomm_channels, (btstack_linked_item_t *) channel); 1495 1496 // free channel 1497 btstack_memory_rfcomm_channel_free(channel); 1498 1499 // update multiplexer timeout after channel was removed from list 1500 rfcomm_multiplexer_prepare_idle_timer(multiplexer); 1501 } 1502 1503 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event){ 1504 1505 // TODO: if client max frame size is smaller than RFCOMM_DEFAULT_SIZE, send PN 1506 1507 1508 // lookup existing channel 1509 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 1510 1511 // log_info("rfcomm_channel_state_machine_with_dlci lookup dlci #%u = 0x%08x - event %u", dlci, (int) channel, event->type); 1512 1513 if (channel) { 1514 int rfcomm_channel_valid = 1; 1515 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1516 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1517 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1518 } 1519 return; 1520 } 1521 1522 // service registered? 1523 rfcomm_service_t * service = rfcomm_service_for_channel(dlci >> 1); 1524 // log_info("rfcomm_channel_state_machine_with_dlci service dlci #%u = 0x%08x", dlci, (int) service); 1525 if (!service) { 1526 // discard request by sending disconnected mode 1527 multiplexer->send_dm_for_dlci = dlci; 1528 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1529 return; 1530 } 1531 1532 // create channel for some events 1533 switch (event->type) { 1534 case CH_EVT_RCVD_SABM: 1535 case CH_EVT_RCVD_PN: 1536 case CH_EVT_RCVD_RPN_REQ: 1537 case CH_EVT_RCVD_RPN_CMD: 1538 // setup incoming channel 1539 channel = rfcomm_channel_create(multiplexer, service, dlci >> 1); 1540 if (!channel){ 1541 // discard request by sending disconnected mode 1542 multiplexer->send_dm_for_dlci = dlci; 1543 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1544 } 1545 break; 1546 default: 1547 break; 1548 } 1549 1550 if (!channel) { 1551 // discard request by sending disconnected mode 1552 multiplexer->send_dm_for_dlci = dlci; 1553 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1554 return; 1555 } 1556 1557 int rfcomm_channel_valid = 1; 1558 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1559 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1560 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1561 } 1562 } 1563 1564 static void rfcomm_channel_packet_handler(rfcomm_multiplexer_t * multiplexer, uint8_t *packet, uint16_t size){ 1565 1566 UNUSED(size); // ok: fixed format messages 1567 1568 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1569 const uint8_t frame_dlci = packet[0] >> 2; 1570 uint8_t message_dlci; // used by commands in UIH(_PF) packets 1571 uint8_t message_len; // " 1572 1573 // rfcomm: (1) command/control 1574 // -- credits_offset = 1 if command == BT_RFCOMM_UIH_PF 1575 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1576 // rfcomm: (2) length. if bit 0 is cleared, 2 byte length is used. (little endian) 1577 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1578 // rfcomm: (3+length_offset) credits if credits_offset == 1 1579 // rfcomm: (3+length_offest+credits_offset) 1580 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1581 1582 rfcomm_channel_event_t event; 1583 rfcomm_channel_event_pn_t event_pn; 1584 rfcomm_channel_event_rpn_t event_rpn; 1585 rfcomm_channel_event_msc_t event_msc; 1586 1587 // switch by rfcomm message type 1588 switch(packet[1]) { 1589 1590 case BT_RFCOMM_SABM: 1591 event.type = CH_EVT_RCVD_SABM; 1592 log_info("Received SABM #%u", frame_dlci); 1593 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1594 break; 1595 1596 case BT_RFCOMM_UA: 1597 event.type = CH_EVT_RCVD_UA; 1598 log_info("Received UA #%u",frame_dlci); 1599 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1600 break; 1601 1602 case BT_RFCOMM_DISC: 1603 event.type = CH_EVT_RCVD_DISC; 1604 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1605 break; 1606 1607 case BT_RFCOMM_DM: 1608 case BT_RFCOMM_DM_PF: 1609 event.type = CH_EVT_RCVD_DM; 1610 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1611 break; 1612 1613 case BT_RFCOMM_UIH_PF: 1614 case BT_RFCOMM_UIH: 1615 1616 message_len = packet[payload_offset+1] >> 1; 1617 1618 switch (packet[payload_offset]) { 1619 case BT_RFCOMM_PN_CMD: 1620 message_dlci = packet[payload_offset+2]; 1621 event_pn.super.type = CH_EVT_RCVD_PN; 1622 event_pn.priority = packet[payload_offset+4]; 1623 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1624 event_pn.credits_outgoing = packet[payload_offset+9]; 1625 log_info("Received UIH Parameter Negotiation Command for #%u, credits %u", 1626 message_dlci, event_pn.credits_outgoing); 1627 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1628 break; 1629 1630 case BT_RFCOMM_PN_RSP: 1631 message_dlci = packet[payload_offset+2]; 1632 event_pn.super.type = CH_EVT_RCVD_PN_RSP; 1633 event_pn.priority = packet[payload_offset+4]; 1634 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1635 event_pn.credits_outgoing = packet[payload_offset+9]; 1636 log_info("Received UIH Parameter Negotiation Response max frame %u, credits %u", 1637 event_pn.max_frame_size, event_pn.credits_outgoing); 1638 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1639 break; 1640 1641 case BT_RFCOMM_MSC_CMD: 1642 message_dlci = packet[payload_offset+2] >> 2; 1643 event_msc.super.type = CH_EVT_RCVD_MSC_CMD; 1644 event_msc.modem_status = packet[payload_offset+3]; 1645 log_info("Received MSC CMD for #%u, ", message_dlci); 1646 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_msc); 1647 break; 1648 1649 case BT_RFCOMM_MSC_RSP: 1650 message_dlci = packet[payload_offset+2] >> 2; 1651 event.type = CH_EVT_RCVD_MSC_RSP; 1652 log_info("Received MSC RSP for #%u", message_dlci); 1653 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1654 break; 1655 1656 case BT_RFCOMM_RPN_CMD: 1657 message_dlci = packet[payload_offset+2] >> 2; 1658 switch (message_len){ 1659 case 1: 1660 log_info("Received Remote Port Negotiation Request for #%u", message_dlci); 1661 event.type = CH_EVT_RCVD_RPN_REQ; 1662 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1663 break; 1664 case 8: 1665 log_info("Received Remote Port Negotiation Update for #%u", message_dlci); 1666 event_rpn.super.type = CH_EVT_RCVD_RPN_CMD; 1667 event_rpn.data = *(rfcomm_rpn_data_t*) &packet[payload_offset+3]; 1668 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rpn); 1669 break; 1670 default: 1671 break; 1672 } 1673 break; 1674 1675 case BT_RFCOMM_RPN_RSP: 1676 log_info("Received RPN response"); 1677 break; 1678 1679 case BT_RFCOMM_RLS_CMD: { 1680 log_info("Received RLS command"); 1681 message_dlci = packet[payload_offset+2] >> 2; 1682 rfcomm_channel_event_rls_t event_rls; 1683 event_rls.super.type = CH_EVT_RCVD_RLS_CMD; 1684 event_rls.line_status = packet[payload_offset+3]; 1685 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rls); 1686 break; 1687 } 1688 1689 case BT_RFCOMM_RLS_RSP: 1690 log_info("Received RLS response"); 1691 break; 1692 1693 // Following commands are handled by rfcomm_multiplexer_l2cap_packet_handler 1694 // case BT_RFCOMM_TEST_CMD: 1695 // case BT_RFCOMM_FCOFF_CMD: 1696 // case BT_RFCOMM_FCON_CMD: 1697 // everything else is an not supported command 1698 default: { 1699 log_error("Received unknown UIH command packet - 0x%02x", packet[payload_offset]); 1700 multiplexer->nsc_command = packet[payload_offset]; 1701 break; 1702 } 1703 } 1704 break; 1705 1706 default: 1707 log_error("Received unknown RFCOMM message type %x", packet[1]); 1708 break; 1709 } 1710 1711 // trigger next action - example W4_PN_RSP: transition to SEND_SABM which only depends on "can send" 1712 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 1713 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1714 } 1715 } 1716 1717 static void rfcomm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1718 1719 if (packet_type == HCI_EVENT_PACKET){ 1720 rfcomm_hci_event_handler(packet, size); 1721 return; 1722 } 1723 1724 // we only handle l2cap packets for: 1725 if (packet_type != L2CAP_DATA_PACKET) return; 1726 1727 // - multiplexer itself 1728 int handled = rfcomm_multiplexer_l2cap_packet_handler(channel, packet, size); 1729 1730 if (handled) return; 1731 1732 // - channel over open mutliplexer 1733 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1734 if ( (multiplexer == NULL) || (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN)) return; 1735 1736 // channel data ? 1737 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1738 const uint8_t frame_dlci = packet[0] >> 2; 1739 1740 if (frame_dlci && ((packet[1] == BT_RFCOMM_UIH) || (packet[1] == BT_RFCOMM_UIH_PF))) { 1741 rfcomm_channel_packet_handler_uih(multiplexer, packet, size); 1742 return; 1743 } 1744 1745 rfcomm_channel_packet_handler(multiplexer, packet, size); 1746 } 1747 1748 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel){ 1749 // note: exchanging MSC isn't neccessary to consider channel open 1750 // note: having outgoing credits is also not necessary to consider channel open 1751 // log_info("rfcomm_channel_ready_for_open state %u, flags needed %04x, current %04x, rf credits %u, l2cap credits %u ", channel->state, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP|RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP|RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS, channel->state_var, channel->credits_outgoing, channel->multiplexer->l2cap_credits); 1752 // if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP) == 0) return 0; 1753 // if (channel->credits_outgoing == 0) return 0; 1754 log_info("rfcomm_channel_ready_for_open state %u, flags needed %04x, current %04x, rf credits %u", 1755 channel->state, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP, channel->state_var, channel->credits_outgoing); 1756 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP) == 0) return 0; 1757 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS) == 0) return 0; 1758 1759 return 1; 1760 } 1761 1762 static int rfcomm_channel_ready_for_incoming_dlc_setup(rfcomm_channel_t * channel){ 1763 log_info("rfcomm_channel_ready_for_incoming_dlc_setup state var %04x", channel->state_var); 1764 // Client accept and SABM/UA is required, PN RSP is needed if PN was received 1765 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) == 0) return 0; 1766 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM ) == 0) return 0; 1767 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA ) != 0) return 0; 1768 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP ) != 0) return 0; 1769 return 1; 1770 } 1771 1772 inline static void rfcomm_channel_state_add(rfcomm_channel_t *channel, RFCOMM_CHANNEL_STATE_VAR event){ 1773 channel->state_var = (RFCOMM_CHANNEL_STATE_VAR) (channel->state_var | event); 1774 } 1775 inline static void rfcomm_channel_state_remove(rfcomm_channel_t *channel, RFCOMM_CHANNEL_STATE_VAR event){ 1776 channel->state_var = (RFCOMM_CHANNEL_STATE_VAR) (channel->state_var & ~event); 1777 } 1778 1779 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel){ 1780 switch (channel->state){ 1781 case RFCOMM_CHANNEL_SEND_UIH_PN: 1782 log_debug("ch-ready: state %u", channel->state); 1783 return 1; 1784 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 1785 log_debug("ch-ready: state %u", channel->state); 1786 return 1; 1787 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 1788 log_debug("ch-ready: state %u", channel->state); 1789 return 1; 1790 case RFCOMM_CHANNEL_SEND_DISC: 1791 log_debug("ch-ready: state %u", channel->state); 1792 return 1; 1793 case RFCOMM_CHANNEL_SEND_DM: 1794 log_debug("ch-ready: state %u", channel->state); 1795 return 1; 1796 case RFCOMM_CHANNEL_OPEN: 1797 if (channel->new_credits_incoming) { 1798 log_debug("ch-ready: channel open & new_credits_incoming") ; 1799 return 1; 1800 } 1801 break; 1802 case RFCOMM_CHANNEL_DLC_SETUP: 1803 if (channel->state_var & ( 1804 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD | 1805 RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS 1806 )) { 1807 log_debug("ch-ready: channel dlc setup & send msc cmd or send credits") ; 1808 return 1; 1809 } 1810 break; 1811 1812 default: 1813 break; 1814 } 1815 1816 if (channel->state_var & ( 1817 RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP | 1818 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_INFO | 1819 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP | 1820 RFCOMM_CHANNEL_STATE_VAR_SEND_UA | 1821 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP 1822 )){ 1823 log_debug("ch-ready: state %x, state var %x", channel->state, channel->state_var); 1824 return 1; 1825 } 1826 1827 if (channel->rls_line_status != RFCOMM_RLS_STATUS_INVALID) { 1828 log_debug("ch-ready: rls_line_status"); 1829 return 1; 1830 } 1831 1832 return 0; 1833 } 1834 1835 1836 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid){ 1837 1838 // log_info("rfcomm_channel_state_machine_with_channel: state %u, state_var %04x, event %u", channel->state, channel->state_var ,event->type); 1839 1840 // channel != NULL -> channel valid 1841 *out_channel_valid = 1; 1842 1843 rfcomm_multiplexer_t *multiplexer = channel->multiplexer; 1844 1845 // TODO: integrate in common switch 1846 if (event->type == CH_EVT_RCVD_DISC){ 1847 rfcomm_emit_channel_closed(channel); 1848 channel->state = RFCOMM_CHANNEL_SEND_UA_AFTER_DISC; 1849 return; 1850 } 1851 1852 // TODO: integrate in common switch 1853 if (event->type == CH_EVT_RCVD_DM){ 1854 log_info("Received DM message for #%u", channel->dlci); 1855 log_info("-> Closing channel locally for #%u", channel->dlci); 1856 rfcomm_channel_emit_final_event(channel, ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES); 1857 rfcomm_channel_finalize(channel); 1858 *out_channel_valid = 0; 1859 return; 1860 } 1861 1862 // remote port negotiation command - just accept everything for now 1863 // 1864 // "The RPN command can be used before a new DLC is opened and should be used whenever the port settings change." 1865 // "The RPN command is specified as optional in TS 07.10, but it is mandatory to recognize and respond to it in RFCOMM. 1866 // (Although the handling of individual settings are implementation-dependent.)" 1867 // 1868 1869 // TODO: integrate in common switch 1870 if (event->type == CH_EVT_RCVD_RPN_CMD){ 1871 // control port parameters 1872 rfcomm_channel_event_rpn_t *event_rpn = (rfcomm_channel_event_rpn_t*) event; 1873 rfcomm_rpn_data_update(&channel->rpn_data, &event_rpn->data); 1874 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP); 1875 // notify client about new settings 1876 rfcomm_emit_port_configuration(channel); 1877 return; 1878 } 1879 1880 // TODO: integrate in common switch 1881 if (event->type == CH_EVT_RCVD_RPN_REQ){ 1882 // no values got accepted (no values have beens sent) 1883 channel->rpn_data.parameter_mask_0 = 0x00; 1884 channel->rpn_data.parameter_mask_1 = 0x00; 1885 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP); 1886 return; 1887 } 1888 1889 if (event->type == CH_EVT_RCVD_RLS_CMD){ 1890 rfcomm_channel_event_rls_t * event_rls = (rfcomm_channel_event_rls_t*) event; 1891 channel->rls_line_status = event_rls->line_status & 0x0f; 1892 log_info("CH_EVT_RCVD_RLS_CMD setting line status to 0x%0x", channel->rls_line_status); 1893 rfcomm_emit_remote_line_status(channel, event_rls->line_status); 1894 return; 1895 } 1896 1897 // TODO: integrate in common switch 1898 if (event->type == CH_EVT_READY_TO_SEND){ 1899 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP){ 1900 log_info("Sending Remote Port Negotiation RSP for #%u", channel->dlci); 1901 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP); 1902 rfcomm_send_uih_rpn_rsp(multiplexer, channel->dlci, &channel->rpn_data); 1903 return; 1904 } 1905 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP){ 1906 log_info("Sending MSC RSP for #%u", channel->dlci); 1907 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 1908 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP); 1909 rfcomm_send_uih_msc_rsp(multiplexer, channel->dlci, 0x8d); // ea=1,fc=0,rtc=1,rtr=1,ic=0,dv=1 1910 return; 1911 } 1912 if (channel->rls_line_status != RFCOMM_RLS_STATUS_INVALID){ 1913 log_info("Sending RLS RSP 0x%0x", channel->rls_line_status); 1914 uint8_t line_status = channel->rls_line_status; 1915 channel->rls_line_status = RFCOMM_RLS_STATUS_INVALID; 1916 rfcomm_send_uih_rls_rsp(multiplexer, channel->dlci, line_status); 1917 return; 1918 } 1919 } 1920 1921 // emit MSC status to app 1922 if (event->type == CH_EVT_RCVD_MSC_CMD){ 1923 // notify client about new settings 1924 rfcomm_channel_event_msc_t *event_msc = (rfcomm_channel_event_msc_t*) event; 1925 uint8_t modem_status_event[2+1]; 1926 modem_status_event[0] = RFCOMM_EVENT_REMOTE_MODEM_STATUS; 1927 modem_status_event[1] = 1; 1928 modem_status_event[2] = event_msc->modem_status; 1929 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, (uint8_t*)&modem_status_event, sizeof(modem_status_event)); 1930 // no return, MSC_CMD will be handled by state machine below 1931 } 1932 1933 rfcomm_channel_event_pn_t * event_pn = (rfcomm_channel_event_pn_t*) event; 1934 1935 switch (channel->state) { 1936 case RFCOMM_CHANNEL_CLOSED: 1937 switch (event->type){ 1938 case CH_EVT_RCVD_SABM: 1939 log_info("-> Inform app"); 1940 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 1941 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1942 rfcomm_emit_connection_request(channel); 1943 break; 1944 case CH_EVT_RCVD_PN: 1945 rfcomm_channel_accept_pn(channel, event_pn); 1946 log_info("-> Inform app"); 1947 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 1948 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1949 rfcomm_emit_connection_request(channel); 1950 break; 1951 default: 1952 break; 1953 } 1954 break; 1955 1956 case RFCOMM_CHANNEL_INCOMING_SETUP: 1957 switch (event->type){ 1958 case CH_EVT_RCVD_SABM: 1959 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 1960 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 1961 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 1962 } 1963 break; 1964 case CH_EVT_RCVD_PN: 1965 rfcomm_channel_accept_pn(channel, event_pn); 1966 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 1967 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 1968 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 1969 } 1970 break; 1971 case CH_EVT_READY_TO_SEND: 1972 // if / else if is used to check for state transition after sending 1973 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP){ 1974 log_info("Sending UIH Parameter Negotiation Respond for #%u", channel->dlci); 1975 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 1976 rfcomm_send_uih_pn_response(multiplexer, channel->dlci, channel->pn_priority, channel->max_frame_size); 1977 } else if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA){ 1978 log_info("Sending UA #%u", channel->dlci); 1979 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 1980 rfcomm_send_ua(multiplexer, channel->dlci); 1981 } 1982 if (rfcomm_channel_ready_for_incoming_dlc_setup(channel)){ 1983 log_info("Incomping setup done, requesting send MSC CMD and send Credits"); 1984 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 1985 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 1986 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 1987 } 1988 break; 1989 default: 1990 break; 1991 } 1992 break; 1993 1994 case RFCOMM_CHANNEL_W4_MULTIPLEXER: 1995 switch (event->type) { 1996 case CH_EVT_MULTIPLEXER_READY: 1997 log_info("Muliplexer opened, sending UIH PN next"); 1998 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 1999 break; 2000 default: 2001 break; 2002 } 2003 break; 2004 2005 case RFCOMM_CHANNEL_SEND_UIH_PN: 2006 switch (event->type) { 2007 case CH_EVT_READY_TO_SEND: 2008 // update mtu 2009 channel->max_frame_size = btstack_min(multiplexer->max_frame_size, channel->max_frame_size); 2010 log_info("Sending UIH Parameter Negotiation Command for #%u (channel 0x%p) mtu %u", channel->dlci, channel, channel->max_frame_size ); 2011 channel->state = RFCOMM_CHANNEL_W4_PN_RSP; 2012 rfcomm_send_uih_pn_command(multiplexer, channel->dlci, channel->max_frame_size); 2013 break; 2014 default: 2015 break; 2016 } 2017 break; 2018 2019 case RFCOMM_CHANNEL_W4_PN_RSP: 2020 switch (event->type){ 2021 case CH_EVT_RCVD_PN_RSP: 2022 // update max frame size 2023 if (channel->max_frame_size > event_pn->max_frame_size) { 2024 channel->max_frame_size = event_pn->max_frame_size; 2025 } 2026 // new credits 2027 channel->credits_outgoing = event_pn->credits_outgoing; 2028 channel->state = RFCOMM_CHANNEL_SEND_SABM_W4_UA; 2029 break; 2030 default: 2031 break; 2032 } 2033 break; 2034 2035 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 2036 switch (event->type) { 2037 case CH_EVT_READY_TO_SEND: 2038 log_info("Sending SABM #%u", channel->dlci); 2039 channel->state = RFCOMM_CHANNEL_W4_UA; 2040 rfcomm_send_sabm(multiplexer, channel->dlci); 2041 break; 2042 default: 2043 break; 2044 } 2045 break; 2046 2047 case RFCOMM_CHANNEL_W4_UA: 2048 switch (event->type){ 2049 case CH_EVT_RCVD_UA: 2050 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 2051 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2052 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2053 break; 2054 default: 2055 break; 2056 } 2057 break; 2058 2059 case RFCOMM_CHANNEL_DLC_SETUP: 2060 switch (event->type){ 2061 case CH_EVT_RCVD_MSC_CMD: 2062 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_CMD); 2063 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2064 break; 2065 case CH_EVT_RCVD_MSC_RSP: 2066 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP); 2067 break; 2068 2069 case CH_EVT_READY_TO_SEND: 2070 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD){ 2071 log_info("Sending MSC CMD for #%u", channel->dlci); 2072 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2073 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_CMD); 2074 rfcomm_send_uih_msc_cmd(multiplexer, channel->dlci , 0x8d); // ea=1,fc=0,rtc=1,rtr=1,ic=0,dv=1 2075 break; 2076 } 2077 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS){ 2078 log_info("Providing credits for #%u", channel->dlci); 2079 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2080 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS); 2081 2082 if (channel->new_credits_incoming) { 2083 uint8_t new_credits = channel->new_credits_incoming; 2084 channel->new_credits_incoming = 0; 2085 rfcomm_channel_send_credits(channel, new_credits); 2086 } 2087 break; 2088 2089 } 2090 break; 2091 default: 2092 break; 2093 } 2094 // finally done? 2095 if (rfcomm_channel_ready_for_open(channel)){ 2096 channel->state = RFCOMM_CHANNEL_OPEN; 2097 rfcomm_channel_opened(channel); 2098 } 2099 break; 2100 2101 case RFCOMM_CHANNEL_OPEN: 2102 switch (event->type){ 2103 case CH_EVT_RCVD_MSC_CMD: 2104 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2105 break; 2106 case CH_EVT_READY_TO_SEND: 2107 if (channel->new_credits_incoming) { 2108 uint8_t new_credits = channel->new_credits_incoming; 2109 channel->new_credits_incoming = 0; 2110 rfcomm_channel_send_credits(channel, new_credits); 2111 break; 2112 } 2113 break; 2114 case CH_EVT_RCVD_CREDITS: 2115 rfcomm_notify_channel_can_send(); 2116 break; 2117 default: 2118 break; 2119 } 2120 break; 2121 2122 case RFCOMM_CHANNEL_SEND_DM: 2123 switch (event->type) { 2124 case CH_EVT_READY_TO_SEND: 2125 log_info("Sending DM_PF for #%u", channel->dlci); 2126 // don't emit channel closed - channel was never open 2127 channel->state = RFCOMM_CHANNEL_CLOSED; 2128 rfcomm_send_dm_pf(multiplexer, channel->dlci); 2129 rfcomm_channel_finalize(channel); 2130 *out_channel_valid = 0; 2131 break; 2132 default: 2133 break; 2134 } 2135 break; 2136 2137 case RFCOMM_CHANNEL_SEND_DISC: 2138 switch (event->type) { 2139 case CH_EVT_READY_TO_SEND: 2140 channel->state = RFCOMM_CHANNEL_W4_UA_AFTER_DISC; 2141 rfcomm_send_disc(multiplexer, channel->dlci); 2142 break; 2143 default: 2144 break; 2145 } 2146 break; 2147 2148 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 2149 switch (event->type){ 2150 case CH_EVT_RCVD_UA: 2151 channel->state = RFCOMM_CHANNEL_CLOSED; 2152 rfcomm_emit_channel_closed(channel); 2153 rfcomm_channel_finalize(channel); 2154 *out_channel_valid = 0; 2155 break; 2156 default: 2157 break; 2158 } 2159 break; 2160 2161 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 2162 switch (event->type) { 2163 case CH_EVT_READY_TO_SEND: 2164 log_info("Sending UA after DISC for #%u", channel->dlci); 2165 channel->state = RFCOMM_CHANNEL_CLOSED; 2166 rfcomm_send_ua(multiplexer, channel->dlci); 2167 rfcomm_channel_finalize(channel); 2168 *out_channel_valid = 0; 2169 break; 2170 default: 2171 break; 2172 } 2173 break; 2174 2175 default: 2176 break; 2177 } 2178 } 2179 2180 // MARK: RFCOMM BTstack API 2181 2182 void rfcomm_init(void){ 2183 rfcomm_client_cid_generator = 0; 2184 rfcomm_multiplexers = NULL; 2185 rfcomm_services = NULL; 2186 rfcomm_channels = NULL; 2187 rfcomm_security_level = gap_get_security_level(); 2188 } 2189 2190 void rfcomm_set_required_security_level(gap_security_level_t security_level){ 2191 rfcomm_security_level = security_level; 2192 } 2193 2194 int rfcomm_can_send_packet_now(uint16_t rfcomm_cid){ 2195 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2196 if (!channel){ 2197 log_error("rfcomm_send cid 0x%02x doesn't exist!", rfcomm_cid); 2198 return 0; 2199 } 2200 return rfcomm_channel_can_send(channel); 2201 } 2202 2203 void rfcomm_request_can_send_now_event(uint16_t rfcomm_cid){ 2204 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2205 if (!channel){ 2206 log_error("rfcomm_send cid 0x%02x doesn't exist!", rfcomm_cid); 2207 return; 2208 } 2209 channel->waiting_for_can_send_now = 1; 2210 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2211 } 2212 2213 static int rfcomm_assert_send_valid(rfcomm_channel_t * channel , uint16_t len){ 2214 if (len > channel->max_frame_size){ 2215 log_error("rfcomm_send cid 0x%02x, rfcomm data lenght exceeds MTU!", channel->rfcomm_cid); 2216 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2217 } 2218 2219 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2220 if (len > rfcomm_max_frame_size_for_l2cap_mtu(sizeof(outgoing_buffer))){ 2221 log_error("rfcomm_send cid 0x%02x, length exceeds outgoing rfcomm_out_buffer", channel->rfcomm_cid); 2222 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2223 } 2224 #endif 2225 2226 if (!channel->credits_outgoing){ 2227 log_info("rfcomm_send cid 0x%02x, no rfcomm outgoing credits!", channel->rfcomm_cid); 2228 return RFCOMM_NO_OUTGOING_CREDITS; 2229 } 2230 2231 if ((channel->multiplexer->fcon & 1) == 0){ 2232 log_info("rfcomm_send cid 0x%02x, aggregate flow off!", channel->rfcomm_cid); 2233 return RFCOMM_AGGREGATE_FLOW_OFF; 2234 } 2235 return 0; 2236 } 2237 2238 uint16_t rfcomm_get_max_frame_size(uint16_t rfcomm_cid){ 2239 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2240 if (!channel){ 2241 log_error("rfcomm_get_max_frame_size cid 0x%02x doesn't exist!", rfcomm_cid); 2242 return 0; 2243 } 2244 return channel->max_frame_size; 2245 } 2246 2247 // pre: rfcomm_can_send_packet_now(rfcomm_cid) == true 2248 int rfcomm_reserve_packet_buffer(void){ 2249 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2250 log_error("rfcomm_reserve_packet_buffer should not get called with ERTM"); 2251 return 0; 2252 #else 2253 return l2cap_reserve_packet_buffer(); 2254 #endif 2255 } 2256 2257 void rfcomm_release_packet_buffer(void){ 2258 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2259 log_error("rfcomm_release_packet_buffer should not get called with ERTM"); 2260 #else 2261 l2cap_release_packet_buffer(); 2262 #endif 2263 } 2264 2265 uint8_t * rfcomm_get_outgoing_buffer(void){ 2266 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2267 uint8_t * rfcomm_out_buffer = outgoing_buffer; 2268 #else 2269 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 2270 #endif 2271 // address + control + length (16) + no credit field 2272 return &rfcomm_out_buffer[4]; 2273 } 2274 2275 int rfcomm_send_prepared(uint16_t rfcomm_cid, uint16_t len){ 2276 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2277 if (!channel){ 2278 log_error("rfcomm_send_prepared cid 0x%02x doesn't exist!", rfcomm_cid); 2279 return 0; 2280 } 2281 2282 int err = rfcomm_assert_send_valid(channel, len); 2283 if (err) return err; 2284 2285 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2286 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2287 log_error("rfcomm_send_prepared: l2cap cannot send now"); 2288 return BTSTACK_ACL_BUFFERS_FULL; 2289 } 2290 #else 2291 if (!l2cap_can_send_prepared_packet_now(channel->multiplexer->l2cap_cid)){ 2292 log_error("rfcomm_send_prepared: l2cap cannot send now"); 2293 return BTSTACK_ACL_BUFFERS_FULL; 2294 } 2295 #endif 2296 2297 // send might cause l2cap to emit new credits, update counters first 2298 if (len){ 2299 channel->credits_outgoing--; 2300 } else { 2301 log_info("sending empty RFCOMM packet for cid %02x", rfcomm_cid); 2302 } 2303 2304 int result = rfcomm_send_uih_prepared(channel->multiplexer, channel->dlci, len); 2305 2306 if (result != 0) { 2307 if (len) { 2308 channel->credits_outgoing++; 2309 } 2310 log_error("rfcomm_send_prepared: error %d", result); 2311 return result; 2312 } 2313 2314 return result; 2315 } 2316 2317 int rfcomm_send(uint16_t rfcomm_cid, uint8_t *data, uint16_t len){ 2318 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2319 if (!channel){ 2320 log_error("cid 0x%02x doesn't exist!", rfcomm_cid); 2321 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2322 } 2323 2324 int err = rfcomm_assert_send_valid(channel, len); 2325 if (err) return err; 2326 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2327 log_error("rfcomm_send_internal: l2cap cannot send now"); 2328 return BTSTACK_ACL_BUFFERS_FULL; 2329 } 2330 2331 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2332 #else 2333 rfcomm_reserve_packet_buffer(); 2334 #endif 2335 uint8_t * rfcomm_payload = rfcomm_get_outgoing_buffer(); 2336 2337 (void)memcpy(rfcomm_payload, data, len); 2338 err = rfcomm_send_prepared(rfcomm_cid, len); 2339 2340 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2341 #else 2342 if (err){ 2343 rfcomm_release_packet_buffer(); 2344 } 2345 #endif 2346 2347 return err; 2348 } 2349 2350 // Sends Local Lnie Status, see LINE_STATUS_.. 2351 int rfcomm_send_local_line_status(uint16_t rfcomm_cid, uint8_t line_status){ 2352 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2353 if (!channel){ 2354 log_error("rfcomm_send_local_line_status cid 0x%02x doesn't exist!", rfcomm_cid); 2355 return 0; 2356 } 2357 return rfcomm_send_uih_rls_cmd(channel->multiplexer, channel->dlci, line_status); 2358 } 2359 2360 // Sned local modem status. see MODEM_STAUS_.. 2361 int rfcomm_send_modem_status(uint16_t rfcomm_cid, uint8_t modem_status){ 2362 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2363 if (!channel){ 2364 log_error("rfcomm_send_modem_status cid 0x%02x doesn't exist!", rfcomm_cid); 2365 return 0; 2366 } 2367 return rfcomm_send_uih_msc_cmd(channel->multiplexer, channel->dlci, modem_status); 2368 } 2369 2370 // Configure remote port 2371 int rfcomm_send_port_configuration(uint16_t rfcomm_cid, rpn_baud_t baud_rate, rpn_data_bits_t data_bits, rpn_stop_bits_t stop_bits, rpn_parity_t parity, rpn_flow_control_t flow_control){ 2372 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2373 if (!channel){ 2374 log_error("rfcomm_send_port_configuration cid 0x%02x doesn't exist!", rfcomm_cid); 2375 return 0; 2376 } 2377 rfcomm_rpn_data_t rpn_data; 2378 rpn_data.baud_rate = baud_rate; 2379 rpn_data.flags = data_bits | (stop_bits << 2) | (parity << 3); 2380 rpn_data.flow_control = flow_control; 2381 rpn_data.xon = 0; 2382 rpn_data.xoff = 0; 2383 rpn_data.parameter_mask_0 = 0x1f; // all but xon/xoff 2384 rpn_data.parameter_mask_1 = 0x3f; // all flow control options 2385 return rfcomm_send_uih_rpn_cmd(channel->multiplexer, channel->dlci, &rpn_data); 2386 } 2387 2388 // Query remote port 2389 int rfcomm_query_port_configuration(uint16_t rfcomm_cid){ 2390 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2391 if (!channel){ 2392 log_error("rfcomm_query_port_configuration cid 0x%02x doesn't exist!", rfcomm_cid); 2393 return 0; 2394 } 2395 return rfcomm_send_uih_rpn_req(channel->multiplexer, channel->dlci); 2396 } 2397 2398 2399 static uint8_t rfcomm_channel_create_internal(btstack_packet_handler_t packet_handler, bd_addr_t addr, uint8_t server_channel, uint8_t incoming_flow_control, uint8_t initial_credits, uint16_t * out_rfcomm_cid){ 2400 log_info("RFCOMM_CREATE_CHANNEL addr %s channel #%u init credits %u", bd_addr_to_str(addr), server_channel, initial_credits); 2401 2402 // create new multiplexer if necessary 2403 uint8_t status = 0; 2404 uint8_t dlci = 0; 2405 int new_multiplexer = 0; 2406 rfcomm_channel_t * channel = NULL; 2407 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_addr(addr); 2408 if (!multiplexer) { 2409 multiplexer = rfcomm_multiplexer_create_for_addr(addr); 2410 if (!multiplexer) return BTSTACK_MEMORY_ALLOC_FAILED; 2411 2412 multiplexer->outgoing = 1; 2413 multiplexer->state = RFCOMM_MULTIPLEXER_W4_CONNECT; 2414 new_multiplexer = 1; 2415 } 2416 2417 // check if channel for this remote service already exists 2418 dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 2419 channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 2420 if (channel){ 2421 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2422 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2423 } 2424 2425 // prepare channel 2426 channel = rfcomm_channel_create(multiplexer, NULL, server_channel); 2427 if (!channel){ 2428 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2429 return BTSTACK_MEMORY_ALLOC_FAILED; 2430 } 2431 2432 // rfcomm_cid is already assigned by rfcomm_channel_create 2433 channel->incoming_flow_control = incoming_flow_control; 2434 channel->new_credits_incoming = initial_credits; 2435 channel->packet_handler = packet_handler; 2436 2437 // return rfcomm_cid 2438 if (out_rfcomm_cid){ 2439 *out_rfcomm_cid = channel->rfcomm_cid; 2440 } 2441 2442 // start multiplexer setup 2443 if (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN) { 2444 channel->state = RFCOMM_CHANNEL_W4_MULTIPLEXER; 2445 uint16_t l2cap_cid = 0; 2446 #ifdef RFCOMM_USE_ERTM 2447 // request 2448 rfcomm_ertm_request_t request; 2449 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 2450 (void)memcpy(request.addr, addr, 6); 2451 request.ertm_id = rfcomm_next_ertm_id(); 2452 if (rfcomm_ertm_request_callback){ 2453 (*rfcomm_ertm_request_callback)(&request); 2454 } 2455 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 2456 multiplexer->ertm_id = request.ertm_id; 2457 status = l2cap_create_ertm_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, 2458 request.ertm_config, request.ertm_buffer, request.ertm_buffer_size, &l2cap_cid); 2459 } 2460 else 2461 #endif 2462 { 2463 status = l2cap_create_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, l2cap_max_mtu(), &l2cap_cid); 2464 } 2465 if (status) { 2466 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2467 btstack_memory_rfcomm_channel_free(channel); 2468 return status; 2469 } 2470 multiplexer->l2cap_cid = l2cap_cid; 2471 return ERROR_CODE_SUCCESS; 2472 } 2473 2474 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 2475 2476 // start connecting, if multiplexer is already up and running 2477 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 2478 return ERROR_CODE_SUCCESS; 2479 } 2480 2481 uint8_t rfcomm_create_channel_with_initial_credits(btstack_packet_handler_t packet_handler, bd_addr_t addr, uint8_t server_channel, uint8_t initial_credits, uint16_t * out_rfcomm_cid){ 2482 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 1, initial_credits, out_rfcomm_cid); 2483 } 2484 2485 uint8_t rfcomm_create_channel(btstack_packet_handler_t packet_handler, bd_addr_t addr, uint8_t server_channel, uint16_t * out_rfcomm_cid){ 2486 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 0, RFCOMM_CREDITS, out_rfcomm_cid); 2487 } 2488 2489 void rfcomm_disconnect(uint16_t rfcomm_cid){ 2490 log_info("RFCOMM_DISCONNECT cid 0x%02x", rfcomm_cid); 2491 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2492 if (!channel) return; 2493 2494 channel->state = RFCOMM_CHANNEL_SEND_DISC; 2495 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2496 } 2497 2498 static uint8_t rfcomm_register_service_internal(btstack_packet_handler_t packet_handler, 2499 uint8_t channel, uint16_t max_frame_size, uint8_t incoming_flow_control, uint8_t initial_credits){ 2500 2501 log_info("RFCOMM_REGISTER_SERVICE channel #%u mtu %u flow_control %u credits %u", 2502 channel, max_frame_size, incoming_flow_control, initial_credits); 2503 2504 // check if already registered 2505 rfcomm_service_t * service = rfcomm_service_for_channel(channel); 2506 if (service){ 2507 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2508 } 2509 2510 // alloc structure 2511 service = btstack_memory_rfcomm_service_get(); 2512 if (!service) { 2513 return BTSTACK_MEMORY_ALLOC_FAILED; 2514 } 2515 2516 // register with l2cap if not registered before, max MTU 2517 if (btstack_linked_list_empty(&rfcomm_services)){ 2518 l2cap_register_service(rfcomm_packet_handler, BLUETOOTH_PROTOCOL_RFCOMM, 0xffff, rfcomm_security_level); 2519 } 2520 2521 // fill in 2522 service->packet_handler = packet_handler; 2523 service->server_channel = channel; 2524 service->max_frame_size = max_frame_size; 2525 service->incoming_flow_control = incoming_flow_control; 2526 service->incoming_initial_credits = initial_credits; 2527 2528 // add to services list 2529 btstack_linked_list_add(&rfcomm_services, (btstack_linked_item_t *) service); 2530 2531 return 0; 2532 } 2533 2534 uint8_t rfcomm_register_service_with_initial_credits(btstack_packet_handler_t packet_handler, 2535 uint8_t channel, uint16_t max_frame_size, uint8_t initial_credits){ 2536 2537 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 1, initial_credits); 2538 } 2539 2540 uint8_t rfcomm_register_service(btstack_packet_handler_t packet_handler, uint8_t channel, 2541 uint16_t max_frame_size){ 2542 2543 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 0,RFCOMM_CREDITS); 2544 } 2545 2546 void rfcomm_unregister_service(uint8_t service_channel){ 2547 log_info("RFCOMM_UNREGISTER_SERVICE #%u", service_channel); 2548 rfcomm_service_t *service = rfcomm_service_for_channel(service_channel); 2549 if (!service) return; 2550 btstack_linked_list_remove(&rfcomm_services, (btstack_linked_item_t *) service); 2551 btstack_memory_rfcomm_service_free(service); 2552 2553 // unregister if no services active 2554 if (btstack_linked_list_empty(&rfcomm_services)){ 2555 // bt_send_cmd(&l2cap_unregister_service, BLUETOOTH_PROTOCOL_RFCOMM); 2556 l2cap_unregister_service(BLUETOOTH_PROTOCOL_RFCOMM); 2557 } 2558 } 2559 2560 void rfcomm_accept_connection(uint16_t rfcomm_cid){ 2561 log_info("RFCOMM_ACCEPT_CONNECTION cid 0x%02x", rfcomm_cid); 2562 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2563 if (!channel) return; 2564 switch (channel->state) { 2565 case RFCOMM_CHANNEL_INCOMING_SETUP: 2566 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED); 2567 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_PN){ 2568 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 2569 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2570 } 2571 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM){ 2572 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 2573 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2574 } 2575 // at least one of { PN RSP, UA } needs to be sent 2576 // state transistion incoming setup -> dlc setup happens in rfcomm_run after these have been sent 2577 break; 2578 default: 2579 break; 2580 } 2581 2582 } 2583 2584 void rfcomm_decline_connection(uint16_t rfcomm_cid){ 2585 log_info("RFCOMM_DECLINE_CONNECTION cid 0x%02x", rfcomm_cid); 2586 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2587 if (!channel) return; 2588 switch (channel->state) { 2589 case RFCOMM_CHANNEL_INCOMING_SETUP: 2590 channel->state = RFCOMM_CHANNEL_SEND_DM; 2591 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2592 break; 2593 default: 2594 break; 2595 } 2596 } 2597 2598 void rfcomm_grant_credits(uint16_t rfcomm_cid, uint8_t credits){ 2599 log_info("RFCOMM_GRANT_CREDITS cid 0x%02x credits %u", rfcomm_cid, credits); 2600 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2601 if (!channel) return; 2602 if (!channel->incoming_flow_control) return; 2603 channel->new_credits_incoming += credits; 2604 2605 // process 2606 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2607 } 2608 2609 #ifdef RFCOMM_USE_ERTM 2610 void rfcomm_enable_l2cap_ertm(void request_callback(rfcomm_ertm_request_t * request), void released_callback(uint16_t ertm_id)){ 2611 rfcomm_ertm_request_callback = request_callback; 2612 rfcomm_ertm_released_callback = released_callback; 2613 } 2614 #endif 2615