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 BLUEKITCHEN 24 * GMBH 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_RPN_RSP, 131 CH_EVT_RCVD_CREDITS, 132 CH_EVT_MULTIPLEXER_READY, 133 CH_EVT_READY_TO_SEND, 134 } RFCOMM_CHANNEL_EVENT; 135 136 typedef struct rfcomm_channel_event { 137 RFCOMM_CHANNEL_EVENT type; 138 uint16_t dummy; // force rfcomm_channel_event to be 2-byte aligned -> avoid -Wcast-align warning 139 } rfcomm_channel_event_t; 140 141 typedef struct rfcomm_channel_event_pn { 142 rfcomm_channel_event_t super; 143 uint16_t max_frame_size; 144 uint8_t priority; 145 uint8_t credits_outgoing; 146 } rfcomm_channel_event_pn_t; 147 148 typedef struct rfcomm_channel_event_rpn { 149 rfcomm_channel_event_t super; 150 rfcomm_rpn_data_t data; 151 } rfcomm_channel_event_rpn_t; 152 153 typedef struct rfcomm_channel_event_rls { 154 rfcomm_channel_event_t super; 155 uint8_t line_status; 156 } rfcomm_channel_event_rls_t; 157 158 typedef struct rfcomm_channel_event_msc { 159 rfcomm_channel_event_t super; 160 uint8_t modem_status; 161 } rfcomm_channel_event_msc_t; 162 163 164 // global rfcomm data 165 static uint16_t rfcomm_client_cid_generator; // used for client channel IDs 166 167 // linked lists for all 168 static btstack_linked_list_t rfcomm_multiplexers; 169 static btstack_linked_list_t rfcomm_channels; 170 static btstack_linked_list_t rfcomm_services; 171 172 static gap_security_level_t rfcomm_security_level; 173 174 #ifdef RFCOMM_USE_ERTM 175 static uint16_t rfcomm_ertm_id; 176 void (*rfcomm_ertm_request_callback)(rfcomm_ertm_request_t * request); 177 void (*rfcomm_ertm_released_callback)(uint16_t ertm_id); 178 #endif 179 180 #ifdef RFCOMM_USE_OUTGOING_BUFFER 181 static uint8_t outgoing_buffer[1030]; 182 #endif 183 184 static bool rfcomm_channel_can_send(rfcomm_channel_t * channel); 185 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel); 186 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel); 187 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid); 188 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event); 189 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel); 190 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer); 191 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event); 192 193 // MARK: RFCOMM CLIENT EVENTS 194 195 static rfcomm_channel_t * rfcomm_channel_for_rfcomm_cid(uint16_t rfcomm_cid){ 196 btstack_linked_item_t *it; 197 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 198 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 199 if (channel->rfcomm_cid == rfcomm_cid) { 200 return channel; 201 }; 202 } 203 return NULL; 204 } 205 206 static uint16_t rfcomm_next_client_cid(void){ 207 do { 208 if (rfcomm_client_cid_generator == 0xffff) { 209 // don't use 0 as channel id 210 rfcomm_client_cid_generator = 1; 211 } else { 212 rfcomm_client_cid_generator++; 213 } 214 } while (rfcomm_channel_for_rfcomm_cid(rfcomm_client_cid_generator) != NULL); 215 return rfcomm_client_cid_generator; 216 } 217 218 #ifdef RFCOMM_USE_ERTM 219 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_ertm_id(uint16_t ertm_id) { 220 btstack_linked_item_t *it; 221 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 222 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 223 if (multiplexer->ertm_id == ertm_id) { 224 return multiplexer; 225 }; 226 } 227 return NULL; 228 } 229 230 static uint16_t rfcomm_next_ertm_id(void){ 231 do { 232 if (rfcomm_ertm_id == 0xffff) { 233 // don't use 0 as channel id 234 rfcomm_ertm_id = 1; 235 } else { 236 rfcomm_ertm_id++; 237 } 238 } while (rfcomm_multiplexer_for_ertm_id(rfcomm_ertm_id) != NULL); 239 return rfcomm_ertm_id; 240 } 241 242 #endif 243 244 // data: event (8), len(8), address(48), channel (8), rfcomm_cid (16) 245 static void rfcomm_emit_connection_request(rfcomm_channel_t *channel) { 246 log_info("RFCOMM_EVENT_INCOMING_CONNECTION addr %s channel #%u cid 0x%02x", 247 bd_addr_to_str(channel->multiplexer->remote_addr), channel->dlci>>1, channel->rfcomm_cid); 248 uint8_t event[13]; 249 event[0] = RFCOMM_EVENT_INCOMING_CONNECTION; 250 event[1] = sizeof(event) - 2; 251 reverse_bd_addr(channel->multiplexer->remote_addr, &event[2]); 252 event[8] = channel->dlci >> 1; 253 little_endian_store_16(event, 9, channel->rfcomm_cid); 254 little_endian_store_16(event, 11, channel->multiplexer->con_handle); 255 hci_dump_packet(HCI_EVENT_PACKET, 1, event, sizeof(event)); 256 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 257 } 258 259 // API Change: BTstack-0.3.50x uses 260 // data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16) 261 // next Cydia release will use SVN version of this 262 // data: event(8), len(8), status (8), address (48), handle (16), server channel(8), rfcomm_cid(16), max frame size(16) 263 static void rfcomm_emit_channel_opened(rfcomm_channel_t *channel, uint8_t status) { 264 log_info("RFCOMM_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x channel #%u cid 0x%02x mtu %u", 265 status, bd_addr_to_str(channel->multiplexer->remote_addr), channel->multiplexer->con_handle, 266 channel->dlci>>1, channel->rfcomm_cid, channel->max_frame_size); 267 uint8_t event[18]; 268 uint8_t pos = 0; 269 event[pos++] = RFCOMM_EVENT_CHANNEL_OPENED; // 0 270 event[pos++] = sizeof(event) - 2; // 1 271 event[pos++] = status; // 2 272 reverse_bd_addr(channel->multiplexer->remote_addr, &event[pos]); pos += 6; // 3 273 little_endian_store_16(event, pos, channel->multiplexer->con_handle); pos += 2; // 9 274 event[pos++] = channel->dlci >> 1; // 11 275 little_endian_store_16(event, pos, channel->rfcomm_cid); pos += 2; // 12 - channel ID 276 little_endian_store_16(event, pos, channel->max_frame_size); pos += 2; // max frame size 277 event[pos++] = channel->service ? 1 : 0; // linked to service -> incoming 278 hci_dump_packet(HCI_EVENT_PACKET, 1, event, sizeof(event)); 279 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, pos); 280 281 // if channel opened successfully, also send can send now if possible 282 if (status) return; 283 if (rfcomm_channel_can_send(channel)){ 284 rfcomm_emit_can_send_now(channel); 285 } 286 } 287 288 // data: event(8), len(8), rfcomm_cid(16) 289 static void rfcomm_emit_channel_closed(rfcomm_channel_t * channel) { 290 log_info("RFCOMM_EVENT_CHANNEL_CLOSED cid 0x%02x", channel->rfcomm_cid); 291 uint8_t event[4]; 292 event[0] = RFCOMM_EVENT_CHANNEL_CLOSED; 293 event[1] = sizeof(event) - 2; 294 little_endian_store_16(event, 2, channel->rfcomm_cid); 295 hci_dump_packet(HCI_EVENT_PACKET, 1, event, sizeof(event)); 296 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 297 } 298 299 static void rfcomm_emit_remote_line_status(rfcomm_channel_t *channel, uint8_t line_status){ 300 log_info("RFCOMM_EVENT_REMOTE_LINE_STATUS cid 0x%02x c, line status 0x%x", channel->rfcomm_cid, line_status); 301 uint8_t event[5]; 302 event[0] = RFCOMM_EVENT_REMOTE_LINE_STATUS; 303 event[1] = sizeof(event) - 2; 304 little_endian_store_16(event, 2, channel->rfcomm_cid); 305 event[4] = line_status; 306 hci_dump_packet( HCI_EVENT_PACKET, 1, event, sizeof(event)); 307 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 308 } 309 310 static void rfcomm_emit_port_configuration(rfcomm_channel_t *channel, bool remote) { 311 // notify client about new settings 312 uint8_t event[2+2+1+sizeof(rfcomm_rpn_data_t)]; 313 event[0] = RFCOMM_EVENT_PORT_CONFIGURATION; 314 event[1] = sizeof(event) - 2; 315 little_endian_store_16(event, 2, channel->rfcomm_cid); 316 if (remote){ 317 event[4] = 1; 318 (void)memcpy(&event[5], (uint8_t *) &channel->remote_rpn_data, sizeof(rfcomm_rpn_data_t)); 319 } else { 320 event[4] = 0; 321 (void)memcpy(&event[5], (uint8_t *) &channel->local_rpn_data, sizeof(rfcomm_rpn_data_t)); 322 } 323 hci_dump_packet( HCI_EVENT_PACKET, 1, event, sizeof(event)); 324 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 325 } 326 327 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel) { 328 log_debug("RFCOMM_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel->rfcomm_cid); 329 uint8_t event[4]; 330 event[0] = RFCOMM_EVENT_CAN_SEND_NOW; 331 event[1] = sizeof(event) - 2; 332 little_endian_store_16(event, 2, channel->rfcomm_cid); 333 hci_dump_packet( HCI_EVENT_PACKET, 1, event, sizeof(event)); 334 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 335 } 336 337 // MARK RFCOMM RPN DATA HELPER 338 static void rfcomm_rpn_data_set_defaults(rfcomm_rpn_data_t * rpn_data){ 339 rpn_data->baud_rate = RPN_BAUD_9600; /* 9600 bps */ 340 rpn_data->flags = 0x03; /* 8-n-1 */ 341 rpn_data->flow_control = 0; /* no flow control */ 342 rpn_data->xon = 0xd1; /* XON */ 343 rpn_data->xoff = 0xd3; /* XOFF */ 344 rpn_data->parameter_mask_0 = 0x7f; /* parameter mask, all values set */ 345 rpn_data->parameter_mask_1 = 0x3f; /* parameter mask, all values set */ 346 } 347 348 static void rfcomm_rpn_data_update(rfcomm_rpn_data_t * dest, rfcomm_rpn_data_t * src){ 349 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_BAUD){ 350 dest->baud_rate = src->baud_rate; 351 } 352 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_DATA_BITS){ 353 dest->flags = (dest->flags & 0xfc) | (src->flags & 0x03); 354 } 355 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_STOP_BITS){ 356 dest->flags = (dest->flags & 0xfb) | (src->flags & 0x04); 357 } 358 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY){ 359 dest->flags = (dest->flags & 0xf7) | (src->flags & 0x08); 360 } 361 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY_TYPE){ 362 dest->flags = (dest->flags & 0xcf) | (src->flags & 0x30); 363 } 364 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XON_CHAR){ 365 dest->xon = src->xon; 366 } 367 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XOFF_CHAR){ 368 dest->xoff = src->xoff; 369 } 370 uint8_t mask = src->parameter_mask_1 & 0x3f; 371 dest->flow_control = (dest->flow_control & ~mask) | (src->flow_control & mask); 372 // always copy parameter mask, too. informative for client, needed for response 373 dest->parameter_mask_0 = src->parameter_mask_0; 374 dest->parameter_mask_1 = src->parameter_mask_1; 375 } 376 // MARK: RFCOMM MULTIPLEXER HELPER 377 378 static uint16_t rfcomm_max_frame_size_for_l2cap_mtu(uint16_t l2cap_mtu){ 379 // Assume RFCOMM header without credits and 2 byte (14 bit) length field 380 uint16_t max_frame_size = l2cap_mtu - 5; 381 log_info("rfcomm_max_frame_size_for_l2cap_mtu: %u -> %u", l2cap_mtu, max_frame_size); 382 return max_frame_size; 383 } 384 385 static void rfcomm_multiplexer_initialize(rfcomm_multiplexer_t *multiplexer){ 386 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 387 multiplexer->fcon = 1; 388 multiplexer->send_dm_for_dlci = 0; 389 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(l2cap_max_mtu()); 390 multiplexer->test_data_len = 0; 391 multiplexer->nsc_command = 0; 392 } 393 394 static rfcomm_multiplexer_t * rfcomm_multiplexer_create_for_addr(bd_addr_t addr){ 395 396 // alloc structure 397 rfcomm_multiplexer_t * multiplexer = btstack_memory_rfcomm_multiplexer_get(); 398 if (!multiplexer) return NULL; 399 400 // fill in 401 rfcomm_multiplexer_initialize(multiplexer); 402 bd_addr_copy(multiplexer->remote_addr, addr); 403 404 // add to services list 405 btstack_linked_list_add(&rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 406 407 return multiplexer; 408 } 409 410 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_addr(bd_addr_t addr){ 411 btstack_linked_item_t *it; 412 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 413 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 414 // ignore multiplexer in shutdown 415 if (multiplexer->state == RFCOMM_MULTIPLEXER_SHUTTING_DOWN) continue; 416 if (bd_addr_cmp(addr, multiplexer->remote_addr) == 0) { 417 return multiplexer; 418 }; 419 } 420 return NULL; 421 } 422 423 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_l2cap_cid(uint16_t l2cap_cid) { 424 btstack_linked_item_t *it; 425 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 426 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 427 if (multiplexer->l2cap_cid == l2cap_cid) { 428 return multiplexer; 429 }; 430 } 431 return NULL; 432 } 433 434 static int rfcomm_multiplexer_has_channels(rfcomm_multiplexer_t * multiplexer){ 435 btstack_linked_item_t *it; 436 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 437 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 438 if (channel->multiplexer == multiplexer) { 439 return 1; 440 } 441 } 442 return 0; 443 } 444 445 // MARK: RFCOMM CHANNEL HELPER 446 447 static void rfcomm_dump_channels(void){ 448 #ifdef ENABLE_LOG_INFO 449 btstack_linked_item_t * it; 450 int channels = 0; 451 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 452 rfcomm_channel_t * channel = (rfcomm_channel_t *) it; 453 log_info("Channel #%u: addr %p, state %u", channels, channel, channel->state); 454 channels++; 455 } 456 #endif 457 } 458 459 static void rfcomm_channel_initialize(rfcomm_channel_t *channel, rfcomm_multiplexer_t *multiplexer, 460 rfcomm_service_t *service, uint8_t server_channel){ 461 462 // set defaults for port configuration (even for services) 463 rfcomm_rpn_data_set_defaults(&channel->local_rpn_data); 464 rfcomm_rpn_data_set_defaults(&channel->remote_rpn_data); 465 466 channel->state = RFCOMM_CHANNEL_CLOSED; 467 channel->state_var = RFCOMM_CHANNEL_STATE_VAR_NONE; 468 469 channel->multiplexer = multiplexer; 470 channel->rfcomm_cid = rfcomm_next_client_cid(); 471 channel->max_frame_size = multiplexer->max_frame_size; 472 473 channel->credits_incoming = 0; 474 channel->credits_outgoing = 0; 475 476 // incoming flow control not active 477 channel->new_credits_incoming = RFCOMM_CREDITS; 478 channel->incoming_flow_control = 0; 479 480 // nothing to send 481 channel->local_line_status = RFCOMM_RLS_STATUS_INVALID; 482 channel->remote_line_status = RFCOMM_RLS_STATUS_INVALID; 483 484 // modem status - ea=1,fc=0,rtc=1,rtr=1,ic=0,dv=1 485 channel->local_modem_status = 0x8d; 486 channel->remote_modem_status = 0x8d; 487 488 channel->service = service; 489 if (service) { 490 // incoming connection 491 channel->dlci = (server_channel << 1) | multiplexer->outgoing; 492 if (channel->max_frame_size > service->max_frame_size) { 493 channel->max_frame_size = service->max_frame_size; 494 } 495 channel->incoming_flow_control = service->incoming_flow_control; 496 channel->new_credits_incoming = service->incoming_initial_credits; 497 channel->packet_handler = service->packet_handler; 498 } else { 499 // outgoing connection 500 channel->dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 501 } 502 } 503 504 // service == NULL -> outgoing channel 505 static rfcomm_channel_t * rfcomm_channel_create(rfcomm_multiplexer_t * multiplexer, 506 rfcomm_service_t * service, uint8_t server_channel){ 507 508 log_info("rfcomm_channel_create for service %p, channel %u --- list of channels:", service, server_channel); 509 rfcomm_dump_channels(); 510 511 // alloc structure 512 rfcomm_channel_t * channel = btstack_memory_rfcomm_channel_get(); 513 if (!channel) return NULL; 514 515 // fill in 516 rfcomm_channel_initialize(channel, multiplexer, service, server_channel); 517 518 // add to services list 519 btstack_linked_list_add(&rfcomm_channels, (btstack_linked_item_t *) channel); 520 521 return channel; 522 } 523 524 static void rfcomm_notify_channel_can_send(void){ 525 btstack_linked_list_iterator_t it; 526 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 527 while (btstack_linked_list_iterator_has_next(&it)){ 528 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 529 if (!channel->waiting_for_can_send_now) continue; // didn't try to send yet 530 if (!rfcomm_channel_can_send(channel)) continue; // or cannot yet either 531 532 channel->waiting_for_can_send_now = 0; 533 rfcomm_emit_can_send_now(channel); 534 } 535 } 536 537 static rfcomm_channel_t * rfcomm_channel_for_multiplexer_and_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci){ 538 btstack_linked_item_t *it; 539 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 540 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 541 if ((channel->dlci == dlci) && (channel->multiplexer == multiplexer)) { 542 return channel; 543 }; 544 } 545 return NULL; 546 } 547 548 static rfcomm_service_t * rfcomm_service_for_channel(uint8_t server_channel){ 549 btstack_linked_item_t *it; 550 for (it = (btstack_linked_item_t *) rfcomm_services; it ; it = it->next){ 551 rfcomm_service_t * service = ((rfcomm_service_t *) it); 552 if ( service->server_channel == server_channel){ 553 return service; 554 }; 555 } 556 return NULL; 557 } 558 559 // MARK: RFCOMM SEND 560 561 /** 562 * @param credits - only used for RFCOMM flow control in UIH wiht P/F = 1 563 */ 564 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){ 565 566 if (!l2cap_can_send_packet_now(multiplexer->l2cap_cid)) return BTSTACK_ACL_BUFFERS_FULL; 567 568 #ifdef RFCOMM_USE_OUTGOING_BUFFER 569 uint8_t * rfcomm_out_buffer = outgoing_buffer; 570 #else 571 l2cap_reserve_packet_buffer(); 572 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 573 #endif 574 575 uint16_t pos = 0; 576 uint8_t crc_fields = 3; 577 578 rfcomm_out_buffer[pos++] = address; 579 rfcomm_out_buffer[pos++] = control; 580 581 // length field can be 1 or 2 octets 582 if (len < 128){ 583 rfcomm_out_buffer[pos++] = (len << 1)| 1; // bits 0-6 584 } else { 585 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 586 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 587 crc_fields++; 588 } 589 590 // add credits for UIH frames when PF bit is set 591 if (control == BT_RFCOMM_UIH_PF){ 592 rfcomm_out_buffer[pos++] = credits; 593 } 594 595 // copy actual data 596 if (len) { 597 (void)memcpy(&rfcomm_out_buffer[pos], data, len); 598 pos += len; 599 } 600 601 // UIH frames only calc FCS over address + control (5.1.1) 602 if ((control & 0xef) == BT_RFCOMM_UIH){ 603 crc_fields = 2; 604 } 605 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, crc_fields); // calc fcs 606 607 #ifdef RFCOMM_USE_OUTGOING_BUFFER 608 int err = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 609 #else 610 int err = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 611 #endif 612 613 return err; 614 } 615 616 // simplified version of rfcomm_send_packet_for_multiplexer for prepared rfcomm packet (UIH, 2 byte len, no credits) 617 static uint8_t rfcomm_send_uih_prepared(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t len){ 618 619 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 620 uint8_t control = BT_RFCOMM_UIH; 621 622 #ifdef RFCOMM_USE_OUTGOING_BUFFER 623 uint8_t * rfcomm_out_buffer = outgoing_buffer; 624 #else 625 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 626 #endif 627 628 uint16_t pos = 0; 629 rfcomm_out_buffer[pos++] = address; 630 rfcomm_out_buffer[pos++] = control; 631 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 632 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 633 634 // actual data is already in place 635 pos += len; 636 637 // UIH frames only calc FCS over address + control (5.1.1) 638 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, 2); // calc fcs 639 640 #ifdef RFCOMM_USE_OUTGOING_BUFFER 641 uint8_t status = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 642 #else 643 uint8_t status = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 644 #endif 645 646 return status; 647 } 648 649 // C/R Flag in Address 650 // - terms: initiator = station that creates multiplexer with SABM 651 // - terms: responder = station that responds to multiplexer setup with UA 652 // "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" 653 // - command initiator = 1 /response responder = 1 654 // - command responder = 0 /response initiator = 0 655 // "For UIH frames, the C/R bit is always set according to section 5.4.3.1 in GSM 07.10. 656 // This applies independently of what is contained wthin the UIH frames, either data or control messages." 657 // - c/r = 1 for frames by initiating station, 0 = for frames by responding station 658 659 // C/R Flag in Message 660 // "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." 661 // - If the C/R bit is set to 1 the message is a command 662 // - if it is set to 0 the message is a response. 663 664 // temp/old messge construction 665 666 // new object oriented version 667 static int rfcomm_send_sabm(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 668 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 669 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_SABM, 0, NULL, 0); 670 } 671 672 static int rfcomm_send_disc(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 673 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 674 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DISC, 0, NULL, 0); 675 } 676 677 static int rfcomm_send_ua(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 678 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 679 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UA, 0, NULL, 0); 680 } 681 682 static int rfcomm_send_dm_pf(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 683 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 684 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DM_PF, 0, NULL, 0); 685 } 686 687 static int rfcomm_send_uih_fc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t fcon) { 688 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 689 uint8_t payload[2]; 690 uint8_t pos = 0; 691 payload[pos++] = fcon ? BT_RFCOMM_FCON_RSP : BT_RFCOMM_FCOFF_RSP; 692 payload[pos++] = (0 << 1) | 1; // len 693 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 694 } 695 696 // static int rfcomm_send_uih_test_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 697 // uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 698 // uint8_t payload[2+len]; 699 // uint8_t pos = 0; 700 // payload[pos++] = BT_RFCOMM_TEST_CMD; 701 // payload[pos++] = (len + 1) << 1 | 1; // len 702 // memcpy(&payload[pos], data, len); 703 // pos += len; 704 // return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 705 // } 706 707 static int rfcomm_send_uih_test_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 708 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 709 uint8_t payload[2+RFCOMM_TEST_DATA_MAX_LEN]; 710 uint8_t pos = 0; 711 payload[pos++] = BT_RFCOMM_TEST_RSP; 712 if (len > RFCOMM_TEST_DATA_MAX_LEN) { 713 len = RFCOMM_TEST_DATA_MAX_LEN; 714 } 715 payload[pos++] = (len << 1) | 1; // len 716 (void)memcpy(&payload[pos], data, len); 717 pos += len; 718 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 719 } 720 721 static int rfcomm_send_uih_msc_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 722 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 723 uint8_t payload[4]; 724 uint8_t pos = 0; 725 payload[pos++] = BT_RFCOMM_MSC_CMD; 726 payload[pos++] = (2 << 1) | 1; // len 727 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 728 payload[pos++] = signals; 729 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 730 } 731 732 static int rfcomm_send_uih_msc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 733 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 734 uint8_t payload[4]; 735 uint8_t pos = 0; 736 payload[pos++] = BT_RFCOMM_MSC_RSP; 737 payload[pos++] = (2 << 1) | 1; // len 738 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 739 payload[pos++] = signals; 740 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 741 } 742 743 static int rfcomm_send_uih_nsc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t command) { 744 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 745 uint8_t payload[3]; 746 uint8_t pos = 0; 747 payload[pos++] = BT_RFCOMM_NSC_RSP; 748 payload[pos++] = (1 << 1) | 1; // len 749 payload[pos++] = command; 750 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 751 } 752 753 static int rfcomm_send_uih_pn_command(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t max_frame_size){ 754 uint8_t payload[10]; 755 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 756 uint8_t pos = 0; 757 payload[pos++] = BT_RFCOMM_PN_CMD; 758 payload[pos++] = (8 << 1) | 1; // len 759 payload[pos++] = dlci; 760 payload[pos++] = 0xf0; // pre-defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 761 payload[pos++] = 0; // priority 762 payload[pos++] = 0; // max 60 seconds ack 763 payload[pos++] = max_frame_size & 0xff; // max framesize low 764 payload[pos++] = max_frame_size >> 8; // max framesize high 765 payload[pos++] = 0x00; // number of retransmissions 766 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 767 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 768 } 769 770 // "The response may not change the DLCI, the priority, the convergence layer, or the timer value." rfcomm_tutorial.pdf 771 static int rfcomm_send_uih_pn_response(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, 772 uint8_t priority, uint16_t max_frame_size){ 773 uint8_t payload[10]; 774 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 775 uint8_t pos = 0; 776 payload[pos++] = BT_RFCOMM_PN_RSP; 777 payload[pos++] = (8 << 1) | 1; // len 778 payload[pos++] = dlci; 779 payload[pos++] = 0xe0; // pre defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 780 payload[pos++] = priority; // priority 781 payload[pos++] = 0; // max 60 seconds ack 782 payload[pos++] = max_frame_size & 0xff; // max framesize low 783 payload[pos++] = max_frame_size >> 8; // max framesize high 784 payload[pos++] = 0x00; // number of retransmissions 785 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 786 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 787 } 788 789 static int rfcomm_send_uih_rls_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 790 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 791 uint8_t payload[4]; 792 uint8_t pos = 0; 793 payload[pos++] = BT_RFCOMM_RLS_CMD; 794 payload[pos++] = (2 << 1) | 1; // len 795 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 796 payload[pos++] = line_status; 797 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 798 } 799 800 static int rfcomm_send_uih_rls_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 801 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 802 uint8_t payload[4]; 803 uint8_t pos = 0; 804 payload[pos++] = BT_RFCOMM_RLS_RSP; 805 payload[pos++] = (2 << 1) | 1; // len 806 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 807 payload[pos++] = line_status; 808 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 809 } 810 811 static int rfcomm_send_uih_rpn_config(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 812 uint8_t payload[10]; 813 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 814 uint8_t pos = 0; 815 payload[pos++] = BT_RFCOMM_RPN_CMD; 816 payload[pos++] = (8 << 1) | 1; // len 817 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 818 payload[pos++] = rpn_data->baud_rate; 819 payload[pos++] = rpn_data->flags; 820 payload[pos++] = rpn_data->flow_control; 821 payload[pos++] = rpn_data->xon; 822 payload[pos++] = rpn_data->xoff; 823 payload[pos++] = rpn_data->parameter_mask_0; 824 payload[pos++] = rpn_data->parameter_mask_1; 825 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 826 } 827 828 static int rfcomm_send_uih_rpn_query(rfcomm_multiplexer_t *multiplexer, uint8_t dlci) { 829 uint8_t payload[3]; 830 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 831 uint8_t pos = 0; 832 payload[pos++] = BT_RFCOMM_RPN_CMD; 833 payload[pos++] = (1 << 1) | 1; // len 834 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 835 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 836 } 837 838 static int rfcomm_send_uih_rpn_response(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 839 uint8_t payload[10]; 840 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 841 uint8_t pos = 0; 842 payload[pos++] = BT_RFCOMM_RPN_RSP; 843 payload[pos++] = (8 << 1) | 1; // len 844 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 845 payload[pos++] = rpn_data->baud_rate; 846 payload[pos++] = rpn_data->flags; 847 payload[pos++] = rpn_data->flow_control; 848 payload[pos++] = rpn_data->xon; 849 payload[pos++] = rpn_data->xoff; 850 payload[pos++] = rpn_data->parameter_mask_0; 851 payload[pos++] = rpn_data->parameter_mask_1; 852 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 853 } 854 855 static void rfcomm_send_uih_credits(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t credits){ 856 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 857 rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH_PF, credits, NULL, 0); 858 } 859 860 // depending on channel state emit channel opened with status or channel closed 861 static void rfcomm_channel_emit_final_event(rfcomm_channel_t * channel, uint8_t status){ 862 // emit appropriate events 863 switch(channel->state){ 864 case RFCOMM_CHANNEL_OPEN: 865 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 866 rfcomm_emit_channel_closed(channel); 867 break; 868 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 869 // remote didn't wait until we send the UA disc 870 // close event already emitted 871 break; 872 default: 873 rfcomm_emit_channel_opened(channel, status); 874 break; 875 } 876 } 877 878 // MARK: RFCOMM MULTIPLEXER 879 static void rfcomm_multiplexer_stop_timer(rfcomm_multiplexer_t * multiplexer){ 880 if (multiplexer->timer_active) { 881 btstack_run_loop_remove_timer(&multiplexer->timer); 882 multiplexer->timer_active = 0; 883 } 884 } 885 static void rfcomm_multiplexer_free(rfcomm_multiplexer_t * multiplexer){ 886 btstack_linked_list_remove( &rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 887 btstack_memory_rfcomm_multiplexer_free(multiplexer); 888 } 889 890 static void rfcomm_multiplexer_finalize(rfcomm_multiplexer_t * multiplexer){ 891 // remove (potential) timer 892 rfcomm_multiplexer_stop_timer(multiplexer); 893 894 // close and remove all channels 895 btstack_linked_item_t *it = (btstack_linked_item_t *) &rfcomm_channels; 896 while (it->next){ 897 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 898 if (channel->multiplexer == multiplexer) { 899 // emit open with status or closed 900 rfcomm_channel_emit_final_event(channel, RFCOMM_MULTIPLEXER_STOPPED); 901 // remove from list 902 it->next = it->next->next; 903 // free channel struct 904 btstack_memory_rfcomm_channel_free(channel); 905 } else { 906 it = it->next; 907 } 908 } 909 910 // remove mutliplexer 911 rfcomm_multiplexer_free(multiplexer); 912 } 913 914 static void rfcomm_multiplexer_timer_handler(btstack_timer_source_t *timer){ 915 rfcomm_multiplexer_t * multiplexer = (rfcomm_multiplexer_t*) btstack_run_loop_get_timer_context(timer); 916 if (rfcomm_multiplexer_has_channels(multiplexer)) return; 917 918 log_info("handler timeout: shutting down multiplexer! (no channels)"); 919 uint16_t l2cap_cid = multiplexer->l2cap_cid; 920 rfcomm_multiplexer_finalize(multiplexer); 921 l2cap_disconnect(l2cap_cid); 922 } 923 924 static void rfcomm_multiplexer_prepare_idle_timer(rfcomm_multiplexer_t * multiplexer){ 925 if (multiplexer->timer_active) { 926 btstack_run_loop_remove_timer(&multiplexer->timer); 927 multiplexer->timer_active = 0; 928 } 929 if (rfcomm_multiplexer_has_channels(multiplexer)) return; 930 931 // start idle timer for multiplexer timeout check as there are no rfcomm channels yet 932 btstack_run_loop_set_timer(&multiplexer->timer, RFCOMM_MULIPLEXER_TIMEOUT_MS); 933 btstack_run_loop_set_timer_handler(&multiplexer->timer, rfcomm_multiplexer_timer_handler); 934 btstack_run_loop_set_timer_context(&multiplexer->timer, multiplexer); 935 btstack_run_loop_add_timer(&multiplexer->timer); 936 multiplexer->timer_active = 1; 937 } 938 939 static void rfcomm_multiplexer_opened(rfcomm_multiplexer_t *multiplexer){ 940 log_info("Multiplexer up and running"); 941 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 942 943 const rfcomm_channel_event_t event = { CH_EVT_MULTIPLEXER_READY, 0}; 944 945 // transition of channels that wait for multiplexer 946 btstack_linked_item_t *it; 947 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 948 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 949 if (channel->multiplexer != multiplexer) continue; 950 int rfcomm_channel_valid = 1; 951 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 952 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 953 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 954 } 955 } 956 rfcomm_multiplexer_prepare_idle_timer(multiplexer); 957 958 // request can send now for multiplexer if ready 959 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 960 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 961 } 962 } 963 964 static void rfcomm_handle_can_send_now(uint16_t l2cap_cid){ 965 966 log_debug("can_send_now enter: %u", l2cap_cid); 967 968 btstack_linked_list_iterator_t it; 969 int token_consumed = 0; 970 971 // forward token to multiplexer 972 btstack_linked_list_iterator_init(&it, &rfcomm_multiplexers); 973 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 974 rfcomm_multiplexer_t * multiplexer = (rfcomm_multiplexer_t *) btstack_linked_list_iterator_next(&it); 975 if (multiplexer->l2cap_cid != l2cap_cid) continue; 976 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 977 log_debug("can_send_now enter: multiplexer token"); 978 token_consumed = 1; 979 rfcomm_multiplexer_state_machine(multiplexer, MULT_EV_READY_TO_SEND); 980 } 981 } 982 983 // forward token to channel state machine 984 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 985 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 986 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 987 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 988 // channel state machine 989 if (rfcomm_channel_ready_to_send(channel)){ 990 log_debug("can_send_now enter: channel token"); 991 token_consumed = 1; 992 const rfcomm_channel_event_t event = { CH_EVT_READY_TO_SEND, 0 }; 993 int rfcomm_channel_valid = 1; 994 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 995 } 996 } 997 998 // forward token to client 999 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 1000 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 1001 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 1002 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 1003 // client waiting for can send now 1004 if (!channel->waiting_for_can_send_now) continue; 1005 if ((channel->multiplexer->fcon & 1) == 0) continue; 1006 if (!channel->credits_outgoing){ 1007 log_debug("can_send_now waiting to send but no credits (ignore)"); 1008 continue; 1009 } 1010 1011 log_debug("can_send_now enter: client token"); 1012 token_consumed = 1; 1013 channel->waiting_for_can_send_now = 0; 1014 rfcomm_emit_can_send_now(channel); 1015 } 1016 1017 // if token was consumed, request another one 1018 if (token_consumed) { 1019 l2cap_request_can_send_now_event(l2cap_cid); 1020 } 1021 1022 log_debug("can_send_now exit"); 1023 } 1024 1025 static void rfcomm_multiplexer_set_state_and_request_can_send_now_event(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_STATE state){ 1026 multiplexer->state = state; 1027 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1028 } 1029 1030 /** 1031 * @return handled packet 1032 */ 1033 static int rfcomm_hci_event_handler(uint8_t *packet, uint16_t size){ 1034 1035 UNUSED(size); // ok: handling own l2cap events 1036 1037 bd_addr_t event_addr; 1038 uint16_t l2cap_cid; 1039 hci_con_handle_t con_handle; 1040 rfcomm_multiplexer_t *multiplexer = NULL; 1041 uint8_t status; 1042 1043 switch (hci_event_packet_get_type(packet)) { 1044 1045 // accept incoming rfcomm connection if no multiplexer exists yet 1046 case L2CAP_EVENT_INCOMING_CONNECTION: 1047 l2cap_event_incoming_connection_get_address(packet, event_addr); 1048 con_handle = l2cap_event_incoming_connection_get_handle(packet); 1049 l2cap_cid = l2cap_event_incoming_connection_get_local_cid(packet); 1050 1051 btstack_assert(l2cap_event_incoming_connection_get_psm(packet) == BLUETOOTH_PROTOCOL_RFCOMM); 1052 1053 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1054 1055 if (multiplexer) { 1056 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => decline - multiplexer already exists", l2cap_cid); 1057 l2cap_decline_connection(l2cap_cid); 1058 return 1; 1059 } 1060 1061 // create and inititialize new multiplexer instance (incoming) 1062 multiplexer = rfcomm_multiplexer_create_for_addr(event_addr); 1063 if (!multiplexer){ 1064 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => decline - no memory left", l2cap_cid); 1065 l2cap_decline_connection(l2cap_cid); 1066 return 1; 1067 } 1068 1069 multiplexer->con_handle = con_handle; 1070 multiplexer->l2cap_cid = l2cap_cid; 1071 // 1072 multiplexer->state = RFCOMM_MULTIPLEXER_W4_SABM_0; 1073 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => accept", l2cap_cid); 1074 1075 #ifdef RFCOMM_USE_ERTM 1076 // request 1077 rfcomm_ertm_request_t request; 1078 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 1079 (void)memcpy(request.addr, event_addr, 6); 1080 request.ertm_id = rfcomm_next_ertm_id(); 1081 if (rfcomm_ertm_request_callback){ 1082 (*rfcomm_ertm_request_callback)(&request); 1083 } 1084 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 1085 multiplexer->ertm_id = request.ertm_id; 1086 l2cap_ertm_accept_connection(l2cap_cid, request.ertm_config, request.ertm_buffer, request.ertm_buffer_size); 1087 return 1; 1088 } 1089 #endif 1090 1091 l2cap_accept_connection(l2cap_cid); 1092 return 1; 1093 1094 // l2cap connection opened -> store l2cap_cid, remote_addr 1095 case L2CAP_EVENT_CHANNEL_OPENED: 1096 1097 btstack_assert(l2cap_event_channel_opened_get_psm(packet) == BLUETOOTH_PROTOCOL_RFCOMM); 1098 1099 status = l2cap_event_channel_opened_get_status(packet); 1100 log_info("channel opened, status %u", status); 1101 1102 // get multiplexer for remote addr 1103 con_handle = l2cap_event_channel_opened_get_handle(packet); 1104 l2cap_cid = l2cap_event_channel_opened_get_local_cid(packet); 1105 l2cap_event_channel_opened_get_address(packet, event_addr); 1106 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1107 if (!multiplexer) { 1108 log_error("channel opened but no multiplexer prepared"); 1109 return 1; 1110 } 1111 1112 // set con handle for outgoing (already set for incoming) 1113 multiplexer->con_handle = con_handle; 1114 1115 // on l2cap open error discard everything 1116 if (status){ 1117 1118 // remove (potential) timer 1119 rfcomm_multiplexer_stop_timer(multiplexer); 1120 1121 // mark multiplexer as shutting down 1122 multiplexer->state = RFCOMM_MULTIPLEXER_SHUTTING_DOWN; 1123 1124 // emit rfcomm_channel_opened with status and free channel 1125 // note: repeatedly go over list until full iteration causes no further change 1126 int done; 1127 do { 1128 done = 1; 1129 btstack_linked_item_t * it = (btstack_linked_item_t *) &rfcomm_channels; 1130 while (it->next) { 1131 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 1132 if (channel->multiplexer == multiplexer){ 1133 done = 0; 1134 rfcomm_emit_channel_opened(channel, status); 1135 btstack_linked_list_remove(&rfcomm_channels, (btstack_linked_item_t *) channel); 1136 btstack_memory_rfcomm_channel_free(channel); 1137 break; 1138 } else { 1139 it = it->next; 1140 } 1141 } 1142 } while (!done); 1143 1144 // free multiplexer 1145 rfcomm_multiplexer_free(multiplexer); 1146 return 1; 1147 } 1148 1149 // following could be: rfcomm_multiplexer_state_machine(..., EVENT_L2CAP_OPENED) 1150 1151 // set max frame size based on l2cap MTU 1152 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(little_endian_read_16(packet, 17)); 1153 1154 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_CONNECT) { 1155 log_info("channel opened: outgoing connection"); 1156 multiplexer->l2cap_cid = l2cap_cid; 1157 // send SABM #0 1158 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_SABM_0); 1159 } 1160 return 1; 1161 1162 // l2cap disconnect -> state = RFCOMM_MULTIPLEXER_CLOSED; 1163 1164 // Notify channel packet handler if they can send now 1165 case L2CAP_EVENT_CAN_SEND_NOW: 1166 l2cap_cid = l2cap_event_can_send_now_get_local_cid(packet); 1167 rfcomm_handle_can_send_now(l2cap_cid); 1168 return 1; 1169 1170 case L2CAP_EVENT_CHANNEL_CLOSED: 1171 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 1172 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1173 log_info("channel closed cid 0x%0x, mult %p", l2cap_cid, multiplexer); 1174 if (!multiplexer) break; 1175 log_info("channel closed state %u", multiplexer->state); 1176 // no need to call l2cap_disconnect here, as it's already closed 1177 rfcomm_multiplexer_finalize(multiplexer); 1178 return 1; 1179 1180 #ifdef RFCOMM_USE_ERTM 1181 case L2CAP_EVENT_ERTM_BUFFER_RELEASED: 1182 l2cap_cid = l2cap_event_ertm_buffer_released_get_local_cid(packet); 1183 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1184 if (multiplexer) { 1185 log_info("buffer for ertm id %u released", multiplexer->ertm_id); 1186 if (rfcomm_ertm_released_callback){ 1187 (*rfcomm_ertm_released_callback)(multiplexer->ertm_id); 1188 } 1189 } 1190 break; 1191 #endif 1192 1193 default: 1194 break; 1195 } 1196 return 0; 1197 } 1198 1199 static int rfcomm_multiplexer_l2cap_packet_handler(uint16_t channel, uint8_t *packet, uint16_t size){ 1200 // get or create a multiplexer for a certain device 1201 rfcomm_multiplexer_t *multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1202 if (!multiplexer) return 0; 1203 1204 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1205 1206 if (size < 3) return 0; 1207 1208 // but only care for multiplexer control channel 1209 uint8_t frame_dlci = packet[0] >> 2; 1210 if (frame_dlci) return 0; 1211 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1212 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1213 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1214 switch (packet[1]){ 1215 1216 case BT_RFCOMM_SABM: 1217 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_SABM_0){ 1218 log_info("Received SABM #0"); 1219 multiplexer->outgoing = 0; 1220 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0); 1221 return 1; 1222 } 1223 break; 1224 1225 case BT_RFCOMM_UA: 1226 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_UA_0) { 1227 // UA #0 -> send UA #0, state = RFCOMM_MULTIPLEXER_OPEN 1228 log_info("Received UA #0 "); 1229 rfcomm_multiplexer_opened(multiplexer); 1230 return 1; 1231 } 1232 break; 1233 1234 case BT_RFCOMM_DISC: 1235 // DISC #0 -> send UA #0, close multiplexer 1236 log_info("Received DISC #0, (ougoing = %u)", multiplexer->outgoing); 1237 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC); 1238 return 1; 1239 1240 case BT_RFCOMM_DM: 1241 // DM #0 - we shouldn't get this, just give up 1242 log_info("Received DM #0"); 1243 log_info("-> Closing down multiplexer"); 1244 rfcomm_multiplexer_finalize(multiplexer); 1245 l2cap_disconnect(l2cap_cid); 1246 return 1; 1247 1248 case BT_RFCOMM_UIH: 1249 if (payload_offset >= size) return 0; 1250 1251 if (packet[payload_offset] == BT_RFCOMM_CLD_CMD){ 1252 // Multiplexer close down (CLD) -> close mutliplexer 1253 log_info("Received Multiplexer close down command"); 1254 log_info("-> Closing down multiplexer"); 1255 rfcomm_multiplexer_finalize(multiplexer); 1256 l2cap_disconnect(l2cap_cid); 1257 return 1; 1258 } 1259 switch (packet[payload_offset]){ 1260 case BT_RFCOMM_CLD_CMD: 1261 // Multiplexer close down (CLD) -> close mutliplexer 1262 log_info("Received Multiplexer close down command"); 1263 log_info("-> Closing down multiplexer"); 1264 rfcomm_multiplexer_finalize(multiplexer); 1265 l2cap_disconnect(l2cap_cid); 1266 return 1; 1267 1268 case BT_RFCOMM_FCON_CMD: 1269 multiplexer->fcon = 0x81; 1270 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1271 return 1; 1272 1273 case BT_RFCOMM_FCOFF_CMD: 1274 multiplexer->fcon = 0x80; 1275 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1276 return 1; 1277 1278 case BT_RFCOMM_TEST_CMD: { 1279 if ((payload_offset + 1) >= size) return 0; // (1) 1280 log_info("Received test command"); 1281 int len = packet[payload_offset+1] >> 1; // length < 125 1282 if (len > RFCOMM_TEST_DATA_MAX_LEN){ 1283 len = RFCOMM_TEST_DATA_MAX_LEN; 1284 } 1285 // from (1) => (size - 1 - payload_offset) > 0 1286 len = btstack_min(len, size - 1 - payload_offset); // avoid information leak 1287 multiplexer->test_data_len = len; 1288 (void)memcpy(multiplexer->test_data, 1289 &packet[payload_offset + 2], len); 1290 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1291 return 1; 1292 } 1293 default: 1294 break; 1295 } 1296 break; 1297 1298 default: 1299 break; 1300 1301 } 1302 return 0; 1303 } 1304 1305 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer){ 1306 if (multiplexer->send_dm_for_dlci) return 1; 1307 if (multiplexer->nsc_command) return 1; 1308 if (multiplexer->fcon & 0x80) return 1; 1309 switch (multiplexer->state){ 1310 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1311 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1312 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1313 return 1; 1314 case RFCOMM_MULTIPLEXER_OPEN: 1315 if (multiplexer->test_data_len) { 1316 return 1; 1317 } 1318 break; 1319 default: 1320 break; 1321 } 1322 return 0; 1323 } 1324 1325 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event){ 1326 1327 if (event != MULT_EV_READY_TO_SEND) return; 1328 1329 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1330 1331 // process stored DM responses 1332 if (multiplexer->send_dm_for_dlci){ 1333 uint8_t dlci = multiplexer->send_dm_for_dlci; 1334 multiplexer->send_dm_for_dlci = 0; 1335 rfcomm_send_dm_pf(multiplexer, dlci); 1336 return; 1337 } 1338 1339 if (multiplexer->nsc_command){ 1340 uint8_t command = multiplexer->nsc_command; 1341 multiplexer->nsc_command = 0; 1342 rfcomm_send_uih_nsc_rsp(multiplexer, command); 1343 return; 1344 } 1345 1346 if (multiplexer->fcon & 0x80){ 1347 multiplexer->fcon &= 0x01; 1348 rfcomm_send_uih_fc_rsp(multiplexer, multiplexer->fcon); 1349 1350 if (multiplexer->fcon == 0) return; 1351 // trigger client to send again after sending FCon Response 1352 rfcomm_notify_channel_can_send(); 1353 return; 1354 } 1355 1356 switch (multiplexer->state) { 1357 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1358 log_info("Sending SABM #0 - (multi 0x%p)", multiplexer); 1359 multiplexer->state = RFCOMM_MULTIPLEXER_W4_UA_0; 1360 rfcomm_send_sabm(multiplexer, 0); 1361 break; 1362 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1363 log_info("Sending UA #0"); 1364 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 1365 rfcomm_send_ua(multiplexer, 0); 1366 1367 rfcomm_multiplexer_opened(multiplexer); 1368 break; 1369 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1370 log_info("Sending UA #0"); 1371 log_info("Closing down multiplexer"); 1372 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 1373 rfcomm_send_ua(multiplexer, 0); 1374 1375 rfcomm_multiplexer_finalize(multiplexer); 1376 l2cap_disconnect(l2cap_cid); 1377 break; 1378 case RFCOMM_MULTIPLEXER_OPEN: 1379 // respond to test command 1380 if (multiplexer->test_data_len){ 1381 int len = multiplexer->test_data_len; 1382 log_info("Sending TEST Response with %u bytes", len); 1383 multiplexer->test_data_len = 0; 1384 rfcomm_send_uih_test_rsp(multiplexer, multiplexer->test_data, len); 1385 return; 1386 } 1387 break; 1388 default: 1389 break; 1390 } 1391 } 1392 1393 // MARK: RFCOMM CHANNEL 1394 1395 static void rfcomm_channel_send_credits(rfcomm_channel_t *channel, uint8_t credits){ 1396 channel->credits_incoming += credits; 1397 rfcomm_send_uih_credits(channel->multiplexer, channel->dlci, credits); 1398 } 1399 1400 static bool rfcomm_channel_can_send(rfcomm_channel_t * channel){ 1401 if (!channel->credits_outgoing) return false; 1402 if ((channel->multiplexer->fcon & 1) == 0) return false; 1403 return l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid) != 0; 1404 } 1405 1406 static void rfcomm_channel_opened(rfcomm_channel_t *rfChannel){ 1407 1408 log_info("opened"); 1409 1410 rfChannel->state = RFCOMM_CHANNEL_OPEN; 1411 rfcomm_emit_channel_opened(rfChannel, 0); 1412 rfcomm_emit_port_configuration(rfChannel, false); 1413 1414 // remove (potential) timer 1415 rfcomm_multiplexer_t *multiplexer = rfChannel->multiplexer; 1416 if (multiplexer->timer_active) { 1417 btstack_run_loop_remove_timer(&multiplexer->timer); 1418 multiplexer->timer_active = 0; 1419 } 1420 // hack for problem detecting authentication failure 1421 multiplexer->at_least_one_connection = 1; 1422 1423 // request can send now if channel ready 1424 if (rfcomm_channel_ready_to_send(rfChannel)){ 1425 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1426 } 1427 } 1428 1429 static void rfcomm_channel_packet_handler_uih(rfcomm_multiplexer_t *multiplexer, uint8_t * packet, uint16_t size){ 1430 const uint8_t frame_dlci = packet[0] >> 2; 1431 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1432 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1433 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1434 int request_can_send_now = 0; 1435 1436 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, frame_dlci); 1437 if (!channel) return; 1438 1439 // handle new outgoing credits 1440 if (packet[1] == BT_RFCOMM_UIH_PF) { 1441 1442 // add them 1443 uint16_t new_credits = packet[3+length_offset]; 1444 channel->credits_outgoing += new_credits; 1445 log_info( "RFCOMM data UIH_PF, new credits channel 0x%02x: %u, now %u", channel->rfcomm_cid, new_credits, channel->credits_outgoing); 1446 1447 // notify channel statemachine 1448 rfcomm_channel_event_t channel_event = { CH_EVT_RCVD_CREDITS, 0 }; 1449 log_debug("state machine, waiting_for_can_send_now %u", channel->waiting_for_can_send_now); 1450 int rfcomm_channel_valid = 1; 1451 rfcomm_channel_state_machine_with_channel(channel, &channel_event, &rfcomm_channel_valid); 1452 if (rfcomm_channel_valid){ 1453 if (rfcomm_channel_ready_to_send(channel) || channel->waiting_for_can_send_now){ 1454 request_can_send_now = 1; 1455 } 1456 } 1457 } 1458 1459 // contains payload? 1460 if ((size - 1) > payload_offset){ 1461 1462 // log_info( "RFCOMM data UIH_PF, size %u, channel %p", size-payload_offset-1, rfChannel->connection); 1463 1464 // decrease incoming credit counter 1465 if (channel->credits_incoming > 0){ 1466 channel->credits_incoming--; 1467 } 1468 1469 // deliver payload 1470 (channel->packet_handler)(RFCOMM_DATA_PACKET, channel->rfcomm_cid, 1471 &packet[payload_offset], size-payload_offset-1); 1472 } 1473 1474 // automatically provide new credits to remote device, if no incoming flow control 1475 if (!channel->incoming_flow_control && (channel->credits_incoming < 5)){ 1476 channel->new_credits_incoming = RFCOMM_CREDITS; 1477 request_can_send_now = 1; 1478 } 1479 1480 if (request_can_send_now){ 1481 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1482 } 1483 } 1484 1485 static void rfcomm_channel_accept_pn(rfcomm_channel_t *channel, rfcomm_channel_event_pn_t *event){ 1486 // priority of client request 1487 channel->pn_priority = event->priority; 1488 1489 // new credits 1490 channel->credits_outgoing = event->credits_outgoing; 1491 1492 // negotiate max frame size 1493 if (channel->max_frame_size > channel->multiplexer->max_frame_size) { 1494 channel->max_frame_size = channel->multiplexer->max_frame_size; 1495 } 1496 if (channel->max_frame_size > event->max_frame_size) { 1497 channel->max_frame_size = event->max_frame_size; 1498 } 1499 1500 } 1501 1502 static void rfcomm_channel_finalize(rfcomm_channel_t *channel){ 1503 1504 rfcomm_multiplexer_t *multiplexer = channel->multiplexer; 1505 1506 // remove from list 1507 btstack_linked_list_remove( &rfcomm_channels, (btstack_linked_item_t *) channel); 1508 1509 // free channel 1510 btstack_memory_rfcomm_channel_free(channel); 1511 1512 // update multiplexer timeout after channel was removed from list 1513 rfcomm_multiplexer_prepare_idle_timer(multiplexer); 1514 } 1515 1516 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event){ 1517 1518 // TODO: if client max frame size is smaller than RFCOMM_DEFAULT_SIZE, send PN 1519 1520 1521 // lookup existing channel 1522 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 1523 1524 // log_info("rfcomm_channel_state_machine_with_dlci lookup dlci #%u = 0x%08x - event %u", dlci, (int) channel, event->type); 1525 1526 if (channel) { 1527 int rfcomm_channel_valid = 1; 1528 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1529 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1530 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1531 } 1532 return; 1533 } 1534 1535 // service registered? 1536 rfcomm_service_t * service = rfcomm_service_for_channel(dlci >> 1); 1537 // log_info("rfcomm_channel_state_machine_with_dlci service dlci #%u = 0x%08x", dlci, (int) service); 1538 if (!service) { 1539 // discard request by sending disconnected mode 1540 multiplexer->send_dm_for_dlci = dlci; 1541 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1542 return; 1543 } 1544 1545 // create channel for some events 1546 switch (event->type) { 1547 case CH_EVT_RCVD_SABM: 1548 case CH_EVT_RCVD_PN: 1549 case CH_EVT_RCVD_RPN_REQ: 1550 case CH_EVT_RCVD_RPN_CMD: 1551 // setup incoming channel 1552 channel = rfcomm_channel_create(multiplexer, service, dlci >> 1); 1553 if (!channel){ 1554 // discard request by sending disconnected mode 1555 multiplexer->send_dm_for_dlci = dlci; 1556 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1557 } 1558 break; 1559 default: 1560 break; 1561 } 1562 1563 if (!channel) { 1564 // discard request by sending disconnected mode 1565 multiplexer->send_dm_for_dlci = dlci; 1566 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1567 return; 1568 } 1569 1570 int rfcomm_channel_valid = 1; 1571 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1572 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1573 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1574 } 1575 } 1576 1577 static void rfcomm_channel_packet_handler(rfcomm_multiplexer_t * multiplexer, uint8_t *packet, uint16_t size){ 1578 1579 UNUSED(size); // ok: fixed format messages 1580 1581 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1582 const uint8_t frame_dlci = packet[0] >> 2; 1583 uint8_t message_dlci; // used by commands in UIH(_PF) packets 1584 uint8_t message_len; // " 1585 1586 // rfcomm: (1) command/control 1587 // -- credits_offset = 1 if command == BT_RFCOMM_UIH_PF 1588 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1589 // rfcomm: (2) length. if bit 0 is cleared, 2 byte length is used. (little endian) 1590 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1591 // rfcomm: (3+length_offset) credits if credits_offset == 1 1592 // rfcomm: (3+length_offest+credits_offset) 1593 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1594 1595 rfcomm_channel_event_t event; 1596 rfcomm_channel_event_pn_t event_pn; 1597 rfcomm_channel_event_rpn_t event_rpn; 1598 rfcomm_channel_event_msc_t event_msc; 1599 1600 // switch by rfcomm message type 1601 switch(packet[1]) { 1602 1603 case BT_RFCOMM_SABM: 1604 event.type = CH_EVT_RCVD_SABM; 1605 log_info("Received SABM #%u", frame_dlci); 1606 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1607 break; 1608 1609 case BT_RFCOMM_UA: 1610 event.type = CH_EVT_RCVD_UA; 1611 log_info("Received UA #%u",frame_dlci); 1612 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1613 break; 1614 1615 case BT_RFCOMM_DISC: 1616 event.type = CH_EVT_RCVD_DISC; 1617 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1618 break; 1619 1620 case BT_RFCOMM_DM: 1621 case BT_RFCOMM_DM_PF: 1622 event.type = CH_EVT_RCVD_DM; 1623 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1624 break; 1625 1626 case BT_RFCOMM_UIH_PF: 1627 case BT_RFCOMM_UIH: 1628 1629 message_len = packet[payload_offset+1] >> 1; 1630 1631 switch (packet[payload_offset]) { 1632 case BT_RFCOMM_PN_CMD: 1633 message_dlci = packet[payload_offset+2]; 1634 event_pn.super.type = CH_EVT_RCVD_PN; 1635 event_pn.priority = packet[payload_offset+4]; 1636 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1637 event_pn.credits_outgoing = packet[payload_offset+9]; 1638 log_info("Received UIH Parameter Negotiation Command for #%u, credits %u", 1639 message_dlci, event_pn.credits_outgoing); 1640 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1641 break; 1642 1643 case BT_RFCOMM_PN_RSP: 1644 message_dlci = packet[payload_offset+2]; 1645 event_pn.super.type = CH_EVT_RCVD_PN_RSP; 1646 event_pn.priority = packet[payload_offset+4]; 1647 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1648 event_pn.credits_outgoing = packet[payload_offset+9]; 1649 log_info("Received UIH Parameter Negotiation Response max frame %u, credits %u", 1650 event_pn.max_frame_size, event_pn.credits_outgoing); 1651 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1652 break; 1653 1654 case BT_RFCOMM_MSC_CMD: 1655 message_dlci = packet[payload_offset+2] >> 2; 1656 event_msc.super.type = CH_EVT_RCVD_MSC_CMD; 1657 event_msc.modem_status = packet[payload_offset+3]; 1658 log_info("Received MSC CMD for #%u, ", message_dlci); 1659 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_msc); 1660 break; 1661 1662 case BT_RFCOMM_MSC_RSP: 1663 message_dlci = packet[payload_offset+2] >> 2; 1664 event.type = CH_EVT_RCVD_MSC_RSP; 1665 log_info("Received MSC RSP for #%u", message_dlci); 1666 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1667 break; 1668 1669 case BT_RFCOMM_RPN_CMD: 1670 message_dlci = packet[payload_offset+2] >> 2; 1671 switch (message_len){ 1672 case 1: 1673 log_info("Received Remote Port Negotiation Request for #%u", message_dlci); 1674 event.type = CH_EVT_RCVD_RPN_REQ; 1675 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1676 break; 1677 case 8: 1678 log_info("Received Remote Port Negotiation Update for #%u", message_dlci); 1679 event_rpn.super.type = CH_EVT_RCVD_RPN_CMD; 1680 event_rpn.data = *(rfcomm_rpn_data_t*) &packet[payload_offset+3]; 1681 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rpn); 1682 break; 1683 default: 1684 break; 1685 } 1686 break; 1687 1688 case BT_RFCOMM_RPN_RSP: 1689 message_dlci = packet[payload_offset+2] >> 2; 1690 if (message_len != 8) break; 1691 event_rpn.super.type = CH_EVT_RCVD_RPN_RSP; 1692 event_rpn.data = *(rfcomm_rpn_data_t*) &packet[payload_offset+3]; 1693 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rpn); 1694 break; 1695 1696 case BT_RFCOMM_RLS_CMD: { 1697 log_info("Received RLS command"); 1698 message_dlci = packet[payload_offset+2] >> 2; 1699 rfcomm_channel_event_rls_t event_rls; 1700 event_rls.super.type = CH_EVT_RCVD_RLS_CMD; 1701 event_rls.line_status = packet[payload_offset+3]; 1702 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rls); 1703 break; 1704 } 1705 1706 case BT_RFCOMM_RLS_RSP: 1707 log_info("Received RLS response"); 1708 break; 1709 1710 // Following commands are handled by rfcomm_multiplexer_l2cap_packet_handler 1711 // case BT_RFCOMM_TEST_CMD: 1712 // case BT_RFCOMM_FCOFF_CMD: 1713 // case BT_RFCOMM_FCON_CMD: 1714 // everything else is an not supported command 1715 default: { 1716 log_error("Received unknown UIH command packet - 0x%02x", packet[payload_offset]); 1717 multiplexer->nsc_command = packet[payload_offset]; 1718 break; 1719 } 1720 } 1721 break; 1722 1723 default: 1724 log_error("Received unknown RFCOMM message type %x", packet[1]); 1725 break; 1726 } 1727 1728 // trigger next action - example W4_PN_RSP: transition to SEND_SABM which only depends on "can send" 1729 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 1730 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1731 } 1732 } 1733 1734 static void rfcomm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1735 1736 if (packet_type == HCI_EVENT_PACKET){ 1737 rfcomm_hci_event_handler(packet, size); 1738 return; 1739 } 1740 1741 // we only handle l2cap packets for: 1742 if (packet_type != L2CAP_DATA_PACKET) return; 1743 1744 // - multiplexer itself 1745 int handled = rfcomm_multiplexer_l2cap_packet_handler(channel, packet, size); 1746 1747 if (handled) return; 1748 1749 // - channel over open multiplexer 1750 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1751 if ( (multiplexer == NULL) || (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN)) return; 1752 1753 // channel data ? 1754 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1755 const uint8_t frame_dlci = packet[0] >> 2; 1756 1757 if (frame_dlci && ((packet[1] == BT_RFCOMM_UIH) || (packet[1] == BT_RFCOMM_UIH_PF))) { 1758 rfcomm_channel_packet_handler_uih(multiplexer, packet, size); 1759 return; 1760 } 1761 1762 rfcomm_channel_packet_handler(multiplexer, packet, size); 1763 } 1764 1765 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel){ 1766 // note: exchanging MSC isn't neccessary to consider channel open 1767 // note: having outgoing credits is also not necessary to consider channel open 1768 // 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); 1769 // if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP) == 0) return 0; 1770 // if (channel->credits_outgoing == 0) return 0; 1771 log_info("rfcomm_channel_ready_for_open state %u, flags needed %04x, current %04x, rf credits %u", 1772 channel->state, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP, channel->state_var, channel->credits_outgoing); 1773 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP) == 0) return 0; 1774 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS) == 0) return 0; 1775 1776 return 1; 1777 } 1778 1779 static int rfcomm_channel_ready_for_incoming_dlc_setup(rfcomm_channel_t * channel){ 1780 log_info("rfcomm_channel_ready_for_incoming_dlc_setup state var %04x", channel->state_var); 1781 // Client accept and SABM/UA is required, PN RSP is needed if PN was received 1782 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) == 0) return 0; 1783 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM ) == 0) return 0; 1784 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA ) != 0) return 0; 1785 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP ) != 0) return 0; 1786 return 1; 1787 } 1788 1789 inline static void rfcomm_channel_state_add(rfcomm_channel_t *channel, uint32_t flag){ 1790 channel->state_var |= flag; 1791 } 1792 inline static void rfcomm_channel_state_remove(rfcomm_channel_t *channel, uint32_t flag){ 1793 channel->state_var &= ~flag; 1794 } 1795 1796 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel){ 1797 switch (channel->state){ 1798 case RFCOMM_CHANNEL_SEND_UIH_PN: 1799 log_debug("ch-ready: state %u", channel->state); 1800 return 1; 1801 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 1802 log_debug("ch-ready: state %u", channel->state); 1803 return 1; 1804 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 1805 log_debug("ch-ready: state %u", channel->state); 1806 return 1; 1807 case RFCOMM_CHANNEL_SEND_DISC: 1808 log_debug("ch-ready: state %u", channel->state); 1809 return 1; 1810 case RFCOMM_CHANNEL_SEND_DM: 1811 log_debug("ch-ready: state %u", channel->state); 1812 return 1; 1813 case RFCOMM_CHANNEL_OPEN: 1814 if (channel->new_credits_incoming) { 1815 log_debug("ch-ready: channel open & new_credits_incoming") ; 1816 return 1; 1817 } 1818 break; 1819 case RFCOMM_CHANNEL_DLC_SETUP: 1820 if (channel->state_var & ( 1821 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD | 1822 RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS 1823 )) { 1824 log_debug("ch-ready: channel dlc setup & send msc cmd or send credits") ; 1825 return 1; 1826 } 1827 break; 1828 1829 default: 1830 break; 1831 } 1832 1833 if (channel->state_var & ( 1834 RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP | 1835 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY | 1836 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG | 1837 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE | 1838 RFCOMM_CHANNEL_STATE_VAR_SEND_UA | 1839 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD | 1840 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP 1841 )){ 1842 log_debug("ch-ready: state %x, state var %x", channel->state, channel->state_var); 1843 return 1; 1844 } 1845 1846 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID) { 1847 log_debug("ch-ready: rls_line_status"); 1848 return 1; 1849 } 1850 1851 if (channel->remote_line_status != RFCOMM_RLS_STATUS_INVALID) { 1852 log_debug("ch-ready: rls_line_status"); 1853 return 1; 1854 } 1855 1856 return 0; 1857 } 1858 1859 1860 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid){ 1861 1862 // channel != NULL -> channel valid 1863 *out_channel_valid = 1; 1864 1865 rfcomm_multiplexer_t *multiplexer = channel->multiplexer; 1866 1867 // TODO: integrate in common switch 1868 if (event->type == CH_EVT_RCVD_DISC){ 1869 rfcomm_emit_channel_closed(channel); 1870 channel->state = RFCOMM_CHANNEL_SEND_UA_AFTER_DISC; 1871 return; 1872 } 1873 1874 // TODO: integrate in common switch 1875 if (event->type == CH_EVT_RCVD_DM){ 1876 log_info("Received DM message for #%u", channel->dlci); 1877 log_info("-> Closing channel locally for #%u", channel->dlci); 1878 rfcomm_channel_emit_final_event(channel, ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES); 1879 rfcomm_channel_finalize(channel); 1880 *out_channel_valid = 0; 1881 return; 1882 } 1883 1884 // remote port negotiation command - just accept everything for now 1885 // 1886 // "The RPN command can be used before a new DLC is opened and should be used whenever the port settings change." 1887 // "The RPN command is specified as optional in TS 07.10, but it is mandatory to recognize and respond to it in RFCOMM. 1888 // (Although the handling of individual settings are implementation-dependent.)" 1889 // 1890 1891 // TODO: integrate in common switch 1892 if (event->type == CH_EVT_RCVD_RPN_CMD){ 1893 // control port parameters 1894 rfcomm_channel_event_rpn_t *event_rpn = (rfcomm_channel_event_rpn_t*) event; 1895 rfcomm_rpn_data_update(&channel->local_rpn_data, &event_rpn->data); 1896 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1897 // notify client about new settings 1898 rfcomm_emit_port_configuration(channel, false); 1899 return; 1900 } 1901 1902 // TODO: integrate in common switch 1903 if (event->type == CH_EVT_RCVD_RPN_REQ){ 1904 // no values got accepted (no values have beens sent) 1905 channel->local_rpn_data.parameter_mask_0 = 0x00; 1906 channel->local_rpn_data.parameter_mask_1 = 0x00; 1907 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1908 return; 1909 } 1910 1911 if (event->type == CH_EVT_RCVD_RLS_CMD){ 1912 rfcomm_channel_event_rls_t * event_rls = (rfcomm_channel_event_rls_t*) event; 1913 channel->remote_line_status = event_rls->line_status & 0x0f; 1914 log_info("CH_EVT_RCVD_RLS_CMD remote line status 0x%0x", channel->remote_line_status); 1915 rfcomm_emit_remote_line_status(channel, channel->remote_line_status); 1916 return; 1917 } 1918 1919 // TODO: integrate in common switch 1920 if (event->type == CH_EVT_READY_TO_SEND){ 1921 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY){ 1922 log_info("Sending Remote Port Configuration Query for #%u", channel->dlci); 1923 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY); 1924 rfcomm_send_uih_rpn_query(channel->multiplexer, channel->dlci); 1925 return; 1926 } 1927 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG){ 1928 log_info("Sending Remote Port Configuration for #%u", channel->dlci); 1929 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG); 1930 rfcomm_send_uih_rpn_config(channel->multiplexer, channel->dlci, &channel->remote_rpn_data); 1931 return; 1932 } 1933 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE){ 1934 log_info("Sending Remote Port Negotiation RSP for #%u", channel->dlci); 1935 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1936 rfcomm_send_uih_rpn_response(multiplexer, channel->dlci, &channel->local_rpn_data); 1937 return; 1938 } 1939 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD){ 1940 log_info("Sending MSC CMD for #%u", channel->dlci); 1941 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 1942 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_CMD); 1943 rfcomm_send_uih_msc_cmd(multiplexer, channel->dlci , channel->local_modem_status); 1944 return; 1945 } 1946 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP){ 1947 log_info("Sending MSC RSP for #%u", channel->dlci); 1948 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 1949 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP); 1950 rfcomm_send_uih_msc_rsp(multiplexer, channel->dlci, channel->remote_modem_status); 1951 return; 1952 } 1953 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID){ 1954 log_info("Sending RLS CMD 0x%0x", channel->local_line_status); 1955 uint8_t line_status = channel->local_line_status; 1956 channel->local_line_status = RFCOMM_RLS_STATUS_INVALID; 1957 rfcomm_send_uih_rls_cmd(multiplexer, channel->dlci, line_status); 1958 return; 1959 } 1960 if (channel->remote_line_status != RFCOMM_RLS_STATUS_INVALID){ 1961 log_info("Sending RLS RSP 0x%0x", channel->remote_line_status); 1962 uint8_t line_status = channel->remote_line_status; 1963 channel->remote_line_status = RFCOMM_RLS_STATUS_INVALID; 1964 rfcomm_send_uih_rls_rsp(multiplexer, channel->dlci, line_status); 1965 return; 1966 } 1967 } 1968 1969 // emit MSC status to app 1970 if (event->type == CH_EVT_RCVD_MSC_CMD){ 1971 // notify client about new settings 1972 rfcomm_channel_event_msc_t *event_msc = (rfcomm_channel_event_msc_t*) event; 1973 uint8_t modem_status_event[5]; 1974 modem_status_event[0] = RFCOMM_EVENT_REMOTE_MODEM_STATUS; 1975 modem_status_event[1] = sizeof(event) - 2; 1976 little_endian_store_16(modem_status_event, 2, channel->rfcomm_cid); 1977 modem_status_event[4] = event_msc->modem_status; 1978 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, (uint8_t*)&modem_status_event, sizeof(modem_status_event)); 1979 // no return, MSC_CMD will be handled by state machine below 1980 } 1981 1982 rfcomm_channel_event_pn_t * event_pn = (rfcomm_channel_event_pn_t*) event; 1983 1984 switch (channel->state) { 1985 case RFCOMM_CHANNEL_CLOSED: 1986 switch (event->type){ 1987 case CH_EVT_RCVD_SABM: 1988 log_info("-> Inform app"); 1989 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 1990 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1991 rfcomm_emit_connection_request(channel); 1992 break; 1993 case CH_EVT_RCVD_PN: 1994 rfcomm_channel_accept_pn(channel, event_pn); 1995 log_info("-> Inform app"); 1996 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 1997 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1998 rfcomm_emit_connection_request(channel); 1999 break; 2000 default: 2001 break; 2002 } 2003 break; 2004 2005 case RFCOMM_CHANNEL_INCOMING_SETUP: 2006 switch (event->type){ 2007 case CH_EVT_RCVD_SABM: 2008 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 2009 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 2010 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 2011 } 2012 break; 2013 case CH_EVT_RCVD_PN: 2014 rfcomm_channel_accept_pn(channel, event_pn); 2015 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 2016 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 2017 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 2018 } 2019 break; 2020 case CH_EVT_READY_TO_SEND: 2021 // if / else if is used to check for state transition after sending 2022 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP){ 2023 log_info("Sending UIH Parameter Negotiation Respond for #%u", channel->dlci); 2024 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 2025 rfcomm_send_uih_pn_response(multiplexer, channel->dlci, channel->pn_priority, channel->max_frame_size); 2026 } else if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA){ 2027 log_info("Sending UA #%u", channel->dlci); 2028 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 2029 rfcomm_send_ua(multiplexer, channel->dlci); 2030 } 2031 if (rfcomm_channel_ready_for_incoming_dlc_setup(channel)){ 2032 log_info("Incomping setup done, requesting send MSC CMD and send Credits"); 2033 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2034 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2035 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 2036 } 2037 break; 2038 default: 2039 break; 2040 } 2041 break; 2042 2043 case RFCOMM_CHANNEL_W4_MULTIPLEXER: 2044 switch (event->type) { 2045 case CH_EVT_MULTIPLEXER_READY: 2046 log_info("Muliplexer opened, sending UIH PN next"); 2047 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 2048 break; 2049 default: 2050 break; 2051 } 2052 break; 2053 2054 case RFCOMM_CHANNEL_SEND_UIH_PN: 2055 switch (event->type) { 2056 case CH_EVT_READY_TO_SEND: 2057 // update mtu 2058 channel->max_frame_size = btstack_min(multiplexer->max_frame_size, channel->max_frame_size); 2059 log_info("Sending UIH Parameter Negotiation Command for #%u (channel 0x%p) mtu %u", channel->dlci, channel, channel->max_frame_size ); 2060 channel->state = RFCOMM_CHANNEL_W4_PN_RSP; 2061 rfcomm_send_uih_pn_command(multiplexer, channel->dlci, channel->max_frame_size); 2062 break; 2063 default: 2064 break; 2065 } 2066 break; 2067 2068 case RFCOMM_CHANNEL_W4_PN_RSP: 2069 switch (event->type){ 2070 case CH_EVT_RCVD_PN_RSP: 2071 // update max frame size 2072 if (channel->max_frame_size > event_pn->max_frame_size) { 2073 channel->max_frame_size = event_pn->max_frame_size; 2074 } 2075 // new credits 2076 channel->credits_outgoing = event_pn->credits_outgoing; 2077 channel->state = RFCOMM_CHANNEL_SEND_SABM_W4_UA; 2078 break; 2079 default: 2080 break; 2081 } 2082 break; 2083 2084 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 2085 switch (event->type) { 2086 case CH_EVT_READY_TO_SEND: 2087 log_info("Sending SABM #%u", channel->dlci); 2088 channel->state = RFCOMM_CHANNEL_W4_UA; 2089 rfcomm_send_sabm(multiplexer, channel->dlci); 2090 break; 2091 default: 2092 break; 2093 } 2094 break; 2095 2096 case RFCOMM_CHANNEL_W4_UA: 2097 switch (event->type){ 2098 case CH_EVT_RCVD_UA: 2099 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 2100 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2101 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2102 break; 2103 default: 2104 break; 2105 } 2106 break; 2107 2108 case RFCOMM_CHANNEL_DLC_SETUP: 2109 switch (event->type){ 2110 case CH_EVT_RCVD_MSC_CMD: 2111 channel->remote_modem_status = ((rfcomm_channel_event_msc_t*) event)->modem_status; 2112 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_CMD); 2113 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2114 break; 2115 case CH_EVT_RCVD_MSC_RSP: 2116 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP); 2117 break; 2118 2119 case CH_EVT_READY_TO_SEND: 2120 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS){ 2121 log_info("Providing credits for #%u", channel->dlci); 2122 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2123 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS); 2124 if (channel->new_credits_incoming) { 2125 uint8_t new_credits = channel->new_credits_incoming; 2126 channel->new_credits_incoming = 0; 2127 rfcomm_channel_send_credits(channel, new_credits); 2128 } 2129 break; 2130 } 2131 break; 2132 default: 2133 break; 2134 } 2135 // finally done? 2136 if (rfcomm_channel_ready_for_open(channel)){ 2137 channel->state = RFCOMM_CHANNEL_OPEN; 2138 rfcomm_channel_opened(channel); 2139 } 2140 break; 2141 2142 case RFCOMM_CHANNEL_OPEN: 2143 switch (event->type){ 2144 case CH_EVT_RCVD_MSC_CMD: 2145 channel->remote_modem_status = ((rfcomm_channel_event_msc_t*) event)->modem_status; 2146 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2147 break; 2148 case CH_EVT_RCVD_RPN_RSP: 2149 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE) == 0) break; 2150 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE); 2151 memcpy(&channel->remote_rpn_data, &((rfcomm_channel_event_rpn_t*) event)->data, sizeof(rfcomm_rpn_data_t)); 2152 rfcomm_emit_port_configuration(channel, true); 2153 break; 2154 case CH_EVT_READY_TO_SEND: 2155 if (channel->new_credits_incoming) { 2156 uint8_t new_credits = channel->new_credits_incoming; 2157 channel->new_credits_incoming = 0; 2158 rfcomm_channel_send_credits(channel, new_credits); 2159 break; 2160 } 2161 break; 2162 case CH_EVT_RCVD_CREDITS: 2163 rfcomm_notify_channel_can_send(); 2164 break; 2165 default: 2166 break; 2167 } 2168 break; 2169 2170 case RFCOMM_CHANNEL_SEND_DM: 2171 switch (event->type) { 2172 case CH_EVT_READY_TO_SEND: 2173 log_info("Sending DM_PF for #%u", channel->dlci); 2174 // don't emit channel closed - channel was never open 2175 channel->state = RFCOMM_CHANNEL_CLOSED; 2176 rfcomm_send_dm_pf(multiplexer, channel->dlci); 2177 rfcomm_channel_finalize(channel); 2178 *out_channel_valid = 0; 2179 break; 2180 default: 2181 break; 2182 } 2183 break; 2184 2185 case RFCOMM_CHANNEL_SEND_DISC: 2186 switch (event->type) { 2187 case CH_EVT_READY_TO_SEND: 2188 channel->state = RFCOMM_CHANNEL_W4_UA_AFTER_DISC; 2189 rfcomm_send_disc(multiplexer, channel->dlci); 2190 break; 2191 default: 2192 break; 2193 } 2194 break; 2195 2196 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 2197 switch (event->type){ 2198 case CH_EVT_RCVD_UA: 2199 channel->state = RFCOMM_CHANNEL_CLOSED; 2200 rfcomm_emit_channel_closed(channel); 2201 rfcomm_channel_finalize(channel); 2202 *out_channel_valid = 0; 2203 break; 2204 default: 2205 break; 2206 } 2207 break; 2208 2209 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 2210 switch (event->type) { 2211 case CH_EVT_READY_TO_SEND: 2212 log_info("Sending UA after DISC for #%u", channel->dlci); 2213 channel->state = RFCOMM_CHANNEL_CLOSED; 2214 rfcomm_send_ua(multiplexer, channel->dlci); 2215 rfcomm_channel_finalize(channel); 2216 *out_channel_valid = 0; 2217 break; 2218 default: 2219 break; 2220 } 2221 break; 2222 2223 default: 2224 break; 2225 } 2226 } 2227 2228 // MARK: RFCOMM BTstack API 2229 2230 void rfcomm_init(void){ 2231 rfcomm_security_level = gap_get_security_level(); 2232 #ifdef RFCOMM_USE_ERTM 2233 rfcomm_ertm_id = 0; 2234 #endif 2235 } 2236 2237 void rfcomm_deinit(void){ 2238 rfcomm_client_cid_generator = 0; 2239 rfcomm_multiplexers = NULL; 2240 rfcomm_services = NULL; 2241 rfcomm_channels = NULL; 2242 #ifdef RFCOMM_USE_ERTM 2243 rfcomm_ertm_request_callback = NULL; 2244 rfcomm_ertm_released_callback = NULL; 2245 #endif 2246 } 2247 2248 void rfcomm_set_required_security_level(gap_security_level_t security_level){ 2249 rfcomm_security_level = security_level; 2250 } 2251 2252 bool rfcomm_can_send_packet_now(uint16_t rfcomm_cid){ 2253 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2254 if (!channel){ 2255 log_error("send cid 0x%02x doesn't exist!", rfcomm_cid); 2256 return false; 2257 } 2258 return rfcomm_channel_can_send(channel); 2259 } 2260 2261 uint8_t rfcomm_request_can_send_now_event(uint16_t rfcomm_cid){ 2262 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2263 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2264 channel->waiting_for_can_send_now = 1; 2265 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2266 return ERROR_CODE_SUCCESS; 2267 } 2268 2269 static uint8_t rfcomm_assert_send_valid(rfcomm_channel_t * channel , uint16_t len){ 2270 if (len > channel->max_frame_size){ 2271 log_error("send cid 0x%02x, rfcomm data lenght exceeds MTU!", channel->rfcomm_cid); 2272 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2273 } 2274 2275 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2276 if (len > rfcomm_max_frame_size_for_l2cap_mtu(sizeof(outgoing_buffer))){ 2277 log_error("send cid 0x%02x, length exceeds outgoing rfcomm_out_buffer", channel->rfcomm_cid); 2278 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2279 } 2280 #endif 2281 2282 if (!channel->credits_outgoing){ 2283 log_info("send cid 0x%02x, no rfcomm outgoing credits!", channel->rfcomm_cid); 2284 return RFCOMM_NO_OUTGOING_CREDITS; 2285 } 2286 2287 if ((channel->multiplexer->fcon & 1) == 0){ 2288 log_info("send cid 0x%02x, aggregate flow off!", channel->rfcomm_cid); 2289 return RFCOMM_AGGREGATE_FLOW_OFF; 2290 } 2291 return ERROR_CODE_SUCCESS; 2292 } 2293 2294 uint16_t rfcomm_get_max_frame_size(uint16_t rfcomm_cid){ 2295 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2296 if (!channel){ 2297 return 0; 2298 } 2299 return channel->max_frame_size; 2300 } 2301 2302 // pre: rfcomm_can_send_packet_now(rfcomm_cid) == true 2303 bool rfcomm_reserve_packet_buffer(void){ 2304 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2305 log_error("rfcomm_reserve_packet_buffer should not get called with ERTM"); 2306 return false; 2307 #else 2308 return l2cap_reserve_packet_buffer(); 2309 #endif 2310 } 2311 2312 void rfcomm_release_packet_buffer(void){ 2313 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2314 log_error("rfcomm_release_packet_buffer should not get called with ERTM"); 2315 #else 2316 l2cap_release_packet_buffer(); 2317 #endif 2318 } 2319 2320 uint8_t * rfcomm_get_outgoing_buffer(void){ 2321 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2322 uint8_t * rfcomm_out_buffer = outgoing_buffer; 2323 #else 2324 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 2325 #endif 2326 // address + control + length (16) + no credit field 2327 return &rfcomm_out_buffer[4]; 2328 } 2329 2330 uint8_t rfcomm_send_prepared(uint16_t rfcomm_cid, uint16_t len){ 2331 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2332 if (!channel){ 2333 log_error("cid 0x%02x doesn't exist!", rfcomm_cid); 2334 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2335 } 2336 2337 uint8_t status = rfcomm_assert_send_valid(channel, len); 2338 if (status != ERROR_CODE_SUCCESS) return status; 2339 2340 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2341 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2342 log_error("l2cap cannot send now"); 2343 return BTSTACK_ACL_BUFFERS_FULL; 2344 } 2345 #else 2346 if (!l2cap_can_send_prepared_packet_now(channel->multiplexer->l2cap_cid)){ 2347 log_error("l2cap cannot send now"); 2348 return BTSTACK_ACL_BUFFERS_FULL; 2349 } 2350 #endif 2351 2352 // send might cause l2cap to emit new credits, update counters first 2353 if (len){ 2354 channel->credits_outgoing--; 2355 } else { 2356 log_info("sending empty RFCOMM packet for cid %02x", rfcomm_cid); 2357 } 2358 2359 status = rfcomm_send_uih_prepared(channel->multiplexer, channel->dlci, len); 2360 2361 if (status != 0) { 2362 log_error("error %d", status); 2363 if (len) { 2364 channel->credits_outgoing++; 2365 } 2366 } 2367 2368 return status; 2369 } 2370 2371 uint8_t rfcomm_send(uint16_t rfcomm_cid, uint8_t *data, uint16_t len){ 2372 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2373 if (!channel){ 2374 log_error("cid 0x%02x doesn't exist!", rfcomm_cid); 2375 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2376 } 2377 2378 uint8_t status = rfcomm_assert_send_valid(channel, len); 2379 if (status != ERROR_CODE_SUCCESS) return status; 2380 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2381 log_error("rfcomm_send_internal: l2cap cannot send now"); 2382 return BTSTACK_ACL_BUFFERS_FULL; 2383 } 2384 2385 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2386 #else 2387 rfcomm_reserve_packet_buffer(); 2388 #endif 2389 uint8_t * rfcomm_payload = rfcomm_get_outgoing_buffer(); 2390 2391 (void)memcpy(rfcomm_payload, data, len); 2392 status = rfcomm_send_prepared(rfcomm_cid, len); 2393 2394 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2395 #else 2396 if (status != ERROR_CODE_SUCCESS){ 2397 rfcomm_release_packet_buffer(); 2398 } 2399 #endif 2400 2401 return ERROR_CODE_SUCCESS; 2402 } 2403 2404 // Sends Local Line Status, see LINE_STATUS_.. 2405 uint8_t rfcomm_send_local_line_status(uint16_t rfcomm_cid, uint8_t line_status){ 2406 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2407 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2408 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID) return ERROR_CODE_COMMAND_DISALLOWED; 2409 channel->local_line_status = line_status; 2410 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2411 return ERROR_CODE_SUCCESS; 2412 } 2413 2414 // Sned local modem status. see MODEM_STAUS_.. 2415 uint8_t rfcomm_send_modem_status(uint16_t rfcomm_cid, uint8_t modem_status){ 2416 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2417 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2418 channel->local_modem_status = modem_status; 2419 // trigger send 2420 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2421 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2422 return ERROR_CODE_SUCCESS; 2423 } 2424 2425 // Configure remote port 2426 uint8_t 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, uint8_t flow_control){ 2427 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2428 if (!channel){ 2429 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2430 } 2431 2432 // store remote config 2433 channel->remote_rpn_data.baud_rate = baud_rate; 2434 channel->remote_rpn_data.flags = data_bits | (stop_bits << 2) | (parity << 3); 2435 channel->remote_rpn_data.flow_control = flow_control; 2436 channel->remote_rpn_data.xon = 0; 2437 channel->remote_rpn_data.xoff = 0; 2438 channel->remote_rpn_data.parameter_mask_0 = 0x1f; // all but xon/xoff 2439 channel->remote_rpn_data.parameter_mask_1 = 0x3f; // all flow control options 2440 2441 // trigger send 2442 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG); 2443 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2444 return ERROR_CODE_SUCCESS; 2445 } 2446 2447 // Query remote port 2448 uint8_t rfcomm_query_port_configuration(uint16_t rfcomm_cid){ 2449 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2450 if (!channel){ 2451 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2452 } 2453 // trigger send 2454 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY | RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE); 2455 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2456 return ERROR_CODE_SUCCESS; 2457 } 2458 2459 2460 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){ 2461 log_info("create addr %s channel #%u init credits %u", bd_addr_to_str(addr), server_channel, initial_credits); 2462 2463 // create new multiplexer if necessary 2464 uint8_t status = 0; 2465 uint8_t dlci = 0; 2466 int new_multiplexer = 0; 2467 rfcomm_channel_t * channel = NULL; 2468 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_addr(addr); 2469 if (!multiplexer) { 2470 multiplexer = rfcomm_multiplexer_create_for_addr(addr); 2471 if (!multiplexer) return BTSTACK_MEMORY_ALLOC_FAILED; 2472 2473 multiplexer->outgoing = 1; 2474 multiplexer->state = RFCOMM_MULTIPLEXER_W4_CONNECT; 2475 new_multiplexer = 1; 2476 } 2477 2478 // check if channel for this remote service already exists 2479 dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 2480 channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 2481 if (channel){ 2482 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2483 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2484 } 2485 2486 // prepare channel 2487 channel = rfcomm_channel_create(multiplexer, NULL, server_channel); 2488 if (!channel){ 2489 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2490 return BTSTACK_MEMORY_ALLOC_FAILED; 2491 } 2492 2493 // rfcomm_cid is already assigned by rfcomm_channel_create 2494 channel->incoming_flow_control = incoming_flow_control; 2495 channel->new_credits_incoming = initial_credits; 2496 channel->packet_handler = packet_handler; 2497 2498 // return rfcomm_cid 2499 if (out_rfcomm_cid){ 2500 *out_rfcomm_cid = channel->rfcomm_cid; 2501 } 2502 2503 // start multiplexer setup 2504 if (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN) { 2505 channel->state = RFCOMM_CHANNEL_W4_MULTIPLEXER; 2506 uint16_t l2cap_cid = 0; 2507 #ifdef RFCOMM_USE_ERTM 2508 // request 2509 rfcomm_ertm_request_t request; 2510 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 2511 (void)memcpy(request.addr, addr, 6); 2512 request.ertm_id = rfcomm_next_ertm_id(); 2513 if (rfcomm_ertm_request_callback){ 2514 (*rfcomm_ertm_request_callback)(&request); 2515 } 2516 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 2517 multiplexer->ertm_id = request.ertm_id; 2518 status = l2cap_ertm_create_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, 2519 request.ertm_config, request.ertm_buffer, request.ertm_buffer_size, &l2cap_cid); 2520 } 2521 else 2522 #endif 2523 { 2524 status = l2cap_create_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, l2cap_max_mtu(), &l2cap_cid); 2525 } 2526 if (status) { 2527 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2528 btstack_memory_rfcomm_channel_free(channel); 2529 return status; 2530 } 2531 multiplexer->l2cap_cid = l2cap_cid; 2532 return ERROR_CODE_SUCCESS; 2533 } 2534 2535 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 2536 2537 // start connecting, if multiplexer is already up and running 2538 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 2539 return ERROR_CODE_SUCCESS; 2540 } 2541 2542 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){ 2543 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 1, initial_credits, out_rfcomm_cid); 2544 } 2545 2546 uint8_t rfcomm_create_channel(btstack_packet_handler_t packet_handler, bd_addr_t addr, uint8_t server_channel, uint16_t * out_rfcomm_cid){ 2547 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 0, RFCOMM_CREDITS, out_rfcomm_cid); 2548 } 2549 2550 uint8_t rfcomm_disconnect(uint16_t rfcomm_cid){ 2551 log_info("disconnect cid 0x%02x", rfcomm_cid); 2552 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2553 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2554 2555 channel->state = RFCOMM_CHANNEL_SEND_DISC; 2556 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2557 return ERROR_CODE_SUCCESS; 2558 } 2559 2560 static uint8_t rfcomm_register_service_internal(btstack_packet_handler_t packet_handler, 2561 uint8_t channel, uint16_t max_frame_size, uint8_t incoming_flow_control, uint8_t initial_credits){ 2562 2563 log_info("register channel #%u mtu %u flow_control %u credits %u", 2564 channel, max_frame_size, incoming_flow_control, initial_credits); 2565 2566 // check if already registered 2567 rfcomm_service_t * service = rfcomm_service_for_channel(channel); 2568 if (service){ 2569 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2570 } 2571 2572 // alloc structure 2573 service = btstack_memory_rfcomm_service_get(); 2574 if (!service) { 2575 return BTSTACK_MEMORY_ALLOC_FAILED; 2576 } 2577 2578 // register with l2cap if not registered before, max MTU 2579 if (btstack_linked_list_empty(&rfcomm_services)){ 2580 uint8_t status = l2cap_register_service(rfcomm_packet_handler, BLUETOOTH_PROTOCOL_RFCOMM, 0xffff, rfcomm_security_level); 2581 if (status != ERROR_CODE_SUCCESS){ 2582 btstack_memory_rfcomm_service_free(service); 2583 return status; 2584 } 2585 } 2586 2587 // fill in 2588 service->packet_handler = packet_handler; 2589 service->server_channel = channel; 2590 service->max_frame_size = max_frame_size; 2591 service->incoming_flow_control = incoming_flow_control; 2592 service->incoming_initial_credits = initial_credits; 2593 2594 // add to services list 2595 btstack_linked_list_add(&rfcomm_services, (btstack_linked_item_t *) service); 2596 2597 return ERROR_CODE_SUCCESS; 2598 } 2599 2600 uint8_t rfcomm_register_service_with_initial_credits(btstack_packet_handler_t packet_handler, 2601 uint8_t channel, uint16_t max_frame_size, uint8_t initial_credits){ 2602 2603 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 1, initial_credits); 2604 } 2605 2606 uint8_t rfcomm_register_service(btstack_packet_handler_t packet_handler, uint8_t channel, 2607 uint16_t max_frame_size){ 2608 2609 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 0,RFCOMM_CREDITS); 2610 } 2611 2612 void rfcomm_unregister_service(uint8_t service_channel){ 2613 rfcomm_service_t *service = rfcomm_service_for_channel(service_channel); 2614 if (!service) return; 2615 btstack_linked_list_remove(&rfcomm_services, (btstack_linked_item_t *) service); 2616 btstack_memory_rfcomm_service_free(service); 2617 2618 // unregister if no services active 2619 if (btstack_linked_list_empty(&rfcomm_services)){ 2620 // bt_send_cmd(&l2cap_unregister_service, BLUETOOTH_PROTOCOL_RFCOMM); 2621 l2cap_unregister_service(BLUETOOTH_PROTOCOL_RFCOMM); 2622 } 2623 } 2624 2625 uint8_t rfcomm_accept_connection(uint16_t rfcomm_cid){ 2626 log_info("accept cid 0x%02x", rfcomm_cid); 2627 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2628 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2629 2630 switch (channel->state) { 2631 case RFCOMM_CHANNEL_INCOMING_SETUP: 2632 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED); 2633 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_PN){ 2634 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 2635 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2636 } 2637 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM){ 2638 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 2639 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2640 } 2641 // at least one of { PN RSP, UA } needs to be sent 2642 // state transistion incoming setup -> dlc setup happens in rfcomm_run after these have been sent 2643 return ERROR_CODE_SUCCESS; 2644 default: 2645 return ERROR_CODE_COMMAND_DISALLOWED; 2646 } 2647 } 2648 2649 uint8_t rfcomm_decline_connection(uint16_t rfcomm_cid){ 2650 log_info("decline cid 0x%02x", rfcomm_cid); 2651 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2652 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2653 2654 switch (channel->state) { 2655 case RFCOMM_CHANNEL_INCOMING_SETUP: 2656 channel->state = RFCOMM_CHANNEL_SEND_DM; 2657 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2658 return ERROR_CODE_SUCCESS; 2659 default: 2660 return ERROR_CODE_COMMAND_DISALLOWED; 2661 } 2662 } 2663 2664 uint8_t rfcomm_grant_credits(uint16_t rfcomm_cid, uint8_t credits){ 2665 log_info("grant cid 0x%02x credits %u", rfcomm_cid, credits); 2666 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2667 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2668 if (!channel->incoming_flow_control) return ERROR_CODE_COMMAND_DISALLOWED; 2669 channel->new_credits_incoming += credits; 2670 2671 // process 2672 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2673 return ERROR_CODE_SUCCESS; 2674 } 2675 2676 #ifdef RFCOMM_USE_ERTM 2677 void rfcomm_enable_l2cap_ertm(void request_callback(rfcomm_ertm_request_t * request), void released_callback(uint16_t ertm_id)){ 2678 rfcomm_ertm_request_callback = request_callback; 2679 rfcomm_ertm_released_callback = released_callback; 2680 } 2681 #endif 2682