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 <inttypes.h> 45 #include <string.h> // memcpy 46 #include <stdint.h> 47 48 #include "bluetooth_sdp.h" 49 #include "btstack_debug.h" 50 #include "btstack_event.h" 51 #include "btstack_memory.h" 52 #include "btstack_util.h" 53 #include "classic/core.h" 54 #include "classic/rfcomm.h" 55 #include "hci.h" 56 #include "hci_cmd.h" 57 #include "hci_dump.h" 58 #include "l2cap.h" 59 60 // workaround for missing PRIxPTR on mspgcc (16/20-bit MCU) 61 #ifndef PRIxPTR 62 #if defined(__MSP430X__) && defined(__MSP430X_LARGE__) 63 #define PRIxPTR "lx" 64 #else 65 #define PRIxPTR "x" 66 #endif 67 #endif 68 69 // ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM requires ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE 70 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM 71 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE 72 #define RFCOMM_USE_OUTGOING_BUFFER 73 #define RFCOMM_USE_ERTM 74 #else 75 #error "ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM requires ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE. " 76 #error "Please disable ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE_FOR_RFCOMM, or, " 77 #error "enable ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE" 78 #endif 79 #endif 80 81 #define RFCOMM_CREDITS 10 82 83 // FCS calc 84 #define BT_RFCOMM_CODE_WORD 0xE0 // pol = x8+x2+x1+1 85 #define BT_RFCOMM_CRC_CHECK_LEN 3 86 #define BT_RFCOMM_UIHCRC_CHECK_LEN 2 87 88 // Control field values bit no. 1 2 3 4 PF 6 7 8 89 #define BT_RFCOMM_SABM 0x3F // 1 1 1 1 1 1 0 0 90 #define BT_RFCOMM_UA 0x73 // 1 1 0 0 1 1 1 0 91 #define BT_RFCOMM_DM 0x0F // 1 1 1 1 0 0 0 0 92 #define BT_RFCOMM_DM_PF 0x1F // 1 1 1 1 1 0 0 0 93 #define BT_RFCOMM_DISC 0x53 // 1 1 0 0 1 0 1 0 94 #define BT_RFCOMM_UIH 0xEF // 1 1 1 1 0 1 1 1 95 #define BT_RFCOMM_UIH_PF 0xFF // 1 1 1 1 0 1 1 1 96 97 // Multiplexer message types 98 #define BT_RFCOMM_CLD_CMD 0xC3 99 #define BT_RFCOMM_FCON_CMD 0xA3 100 #define BT_RFCOMM_FCON_RSP 0xA1 101 #define BT_RFCOMM_FCOFF_CMD 0x63 102 #define BT_RFCOMM_FCOFF_RSP 0x61 103 #define BT_RFCOMM_MSC_CMD 0xE3 104 #define BT_RFCOMM_MSC_RSP 0xE1 105 #define BT_RFCOMM_NSC_RSP 0x11 106 #define BT_RFCOMM_PN_CMD 0x83 107 #define BT_RFCOMM_PN_RSP 0x81 108 #define BT_RFCOMM_RLS_CMD 0x53 109 #define BT_RFCOMM_RLS_RSP 0x51 110 #define BT_RFCOMM_RPN_CMD 0x93 111 #define BT_RFCOMM_RPN_RSP 0x91 112 #define BT_RFCOMM_TEST_CMD 0x23 113 #define BT_RFCOMM_TEST_RSP 0x21 114 115 typedef enum { 116 CH_EVT_RCVD_SABM = 1, 117 CH_EVT_RCVD_UA, 118 CH_EVT_RCVD_PN, 119 CH_EVT_RCVD_PN_RSP, 120 CH_EVT_RCVD_DISC, 121 CH_EVT_RCVD_DM, 122 CH_EVT_RCVD_MSC_CMD, 123 CH_EVT_RCVD_MSC_RSP, 124 CH_EVT_RCVD_NSC_RSP, 125 CH_EVT_RCVD_RLS_CMD, 126 CH_EVT_RCVD_RLS_RSP, 127 CH_EVT_RCVD_RPN_CMD, 128 CH_EVT_RCVD_RPN_REQ, 129 CH_EVT_RCVD_RPN_RSP, 130 CH_EVT_RCVD_CREDITS, 131 CH_EVT_MULTIPLEXER_READY, 132 CH_EVT_READY_TO_SEND, 133 } RFCOMM_CHANNEL_EVENT; 134 135 typedef struct rfcomm_channel_event { 136 RFCOMM_CHANNEL_EVENT type; 137 uint16_t dummy; // force rfcomm_channel_event to be 2-byte aligned -> avoid -Wcast-align warning 138 } rfcomm_channel_event_t; 139 140 typedef struct rfcomm_channel_event_pn { 141 rfcomm_channel_event_t super; 142 uint16_t max_frame_size; 143 uint8_t priority; 144 uint8_t credits_outgoing; 145 } rfcomm_channel_event_pn_t; 146 147 typedef struct rfcomm_channel_event_rpn { 148 rfcomm_channel_event_t super; 149 rfcomm_rpn_data_t data; 150 } rfcomm_channel_event_rpn_t; 151 152 typedef struct rfcomm_channel_event_rls { 153 rfcomm_channel_event_t super; 154 uint8_t line_status; 155 } rfcomm_channel_event_rls_t; 156 157 typedef struct rfcomm_channel_event_msc { 158 rfcomm_channel_event_t super; 159 uint8_t modem_status; 160 } rfcomm_channel_event_msc_t; 161 162 163 // global rfcomm data 164 static uint16_t rfcomm_client_cid_generator; // used for client channel IDs 165 166 // linked lists for all 167 static btstack_linked_list_t rfcomm_multiplexers; 168 static btstack_linked_list_t rfcomm_channels; 169 static btstack_linked_list_t rfcomm_services; 170 171 static gap_security_level_t rfcomm_security_level; 172 173 #ifdef RFCOMM_USE_ERTM 174 static uint16_t rfcomm_ertm_id; 175 void (*rfcomm_ertm_request_callback)(rfcomm_ertm_request_t * request); 176 void (*rfcomm_ertm_released_callback)(uint16_t ertm_id); 177 #endif 178 179 #ifdef RFCOMM_USE_OUTGOING_BUFFER 180 static uint8_t outgoing_buffer[1030]; 181 #endif 182 183 static bool rfcomm_channel_can_send(rfcomm_channel_t * channel); 184 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel); 185 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel); 186 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid); 187 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event); 188 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel); 189 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer); 190 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event); 191 192 // MARK: RFCOMM CLIENT EVENTS 193 194 static rfcomm_channel_t * rfcomm_channel_for_rfcomm_cid(uint16_t rfcomm_cid){ 195 btstack_linked_item_t *it; 196 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 197 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 198 if (channel->rfcomm_cid == rfcomm_cid) { 199 return channel; 200 }; 201 } 202 return NULL; 203 } 204 205 static uint16_t rfcomm_next_client_cid(void){ 206 do { 207 if (rfcomm_client_cid_generator == 0xffff) { 208 // don't use 0 as channel id 209 rfcomm_client_cid_generator = 1; 210 } else { 211 rfcomm_client_cid_generator++; 212 } 213 } while (rfcomm_channel_for_rfcomm_cid(rfcomm_client_cid_generator) != NULL); 214 return rfcomm_client_cid_generator; 215 } 216 217 #ifdef RFCOMM_USE_ERTM 218 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_ertm_id(uint16_t ertm_id) { 219 btstack_linked_item_t *it; 220 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 221 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 222 if (multiplexer->ertm_id == ertm_id) { 223 return multiplexer; 224 }; 225 } 226 return NULL; 227 } 228 229 static uint16_t rfcomm_next_ertm_id(void){ 230 do { 231 if (rfcomm_ertm_id == 0xffff) { 232 // don't use 0 as channel id 233 rfcomm_ertm_id = 1; 234 } else { 235 rfcomm_ertm_id++; 236 } 237 } while (rfcomm_multiplexer_for_ertm_id(rfcomm_ertm_id) != NULL); 238 return rfcomm_ertm_id; 239 } 240 241 #endif 242 243 // data: event (8), len(8), address(48), channel (8), rfcomm_cid (16) 244 static void rfcomm_emit_connection_request(rfcomm_channel_t *channel) { 245 log_info("RFCOMM_EVENT_INCOMING_CONNECTION addr %s channel #%u cid 0x%02x", 246 bd_addr_to_str(channel->multiplexer->remote_addr), channel->dlci>>1, channel->rfcomm_cid); 247 uint8_t event[13]; 248 event[0] = RFCOMM_EVENT_INCOMING_CONNECTION; 249 event[1] = sizeof(event) - 2; 250 reverse_bd_addr(channel->multiplexer->remote_addr, &event[2]); 251 event[8] = channel->dlci >> 1; 252 little_endian_store_16(event, 9, channel->rfcomm_cid); 253 little_endian_store_16(event, 11, channel->multiplexer->con_handle); 254 hci_dump_btstack_event( event, sizeof(event)); 255 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 256 } 257 258 // API Change: BTstack-0.3.50x uses 259 // data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16) 260 // next Cydia release will use SVN version of this 261 // data: event(8), len(8), status (8), address (48), handle (16), server channel(8), rfcomm_cid(16), max frame size(16) 262 static void rfcomm_emit_channel_opened(rfcomm_channel_t *channel, uint8_t status) { 263 log_info("RFCOMM_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x channel #%u cid 0x%02x mtu %u", 264 status, bd_addr_to_str(channel->multiplexer->remote_addr), channel->multiplexer->con_handle, 265 channel->dlci>>1, channel->rfcomm_cid, channel->max_frame_size); 266 uint8_t event[18]; 267 uint8_t pos = 0; 268 event[pos++] = RFCOMM_EVENT_CHANNEL_OPENED; // 0 269 event[pos++] = sizeof(event) - 2; // 1 270 event[pos++] = status; // 2 271 reverse_bd_addr(channel->multiplexer->remote_addr, &event[pos]); pos += 6; // 3 272 little_endian_store_16(event, pos, channel->multiplexer->con_handle); pos += 2; // 9 273 event[pos++] = channel->dlci >> 1; // 11 274 little_endian_store_16(event, pos, channel->rfcomm_cid); pos += 2; // 12 - channel ID 275 little_endian_store_16(event, pos, channel->max_frame_size); pos += 2; // max frame size 276 event[pos++] = channel->service ? 1 : 0; // linked to service -> incoming 277 hci_dump_btstack_event( event, sizeof(event)); 278 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, pos); 279 280 // if channel opened successfully, also send can send now if possible 281 if (status) return; 282 if (rfcomm_channel_can_send(channel)){ 283 rfcomm_emit_can_send_now(channel); 284 } 285 } 286 287 // data: event(8), len(8), rfcomm_cid(16) 288 static void rfcomm_emit_channel_closed(rfcomm_channel_t * channel) { 289 log_info("RFCOMM_EVENT_CHANNEL_CLOSED cid 0x%02x", channel->rfcomm_cid); 290 uint8_t event[4]; 291 event[0] = RFCOMM_EVENT_CHANNEL_CLOSED; 292 event[1] = sizeof(event) - 2; 293 little_endian_store_16(event, 2, channel->rfcomm_cid); 294 hci_dump_btstack_event( event, sizeof(event)); 295 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 296 } 297 298 static void rfcomm_emit_remote_line_status(rfcomm_channel_t *channel, uint8_t line_status){ 299 log_info("RFCOMM_EVENT_REMOTE_LINE_STATUS cid 0x%02x c, line status 0x%x", channel->rfcomm_cid, line_status); 300 uint8_t event[5]; 301 event[0] = RFCOMM_EVENT_REMOTE_LINE_STATUS; 302 event[1] = sizeof(event) - 2; 303 little_endian_store_16(event, 2, channel->rfcomm_cid); 304 event[4] = line_status; 305 hci_dump_btstack_event( event, sizeof(event)); 306 (channel->packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 307 } 308 309 static void rfcomm_emit_port_configuration(rfcomm_channel_t *channel, bool remote) { 310 // notify client about new settings 311 uint8_t event[2+2+1+sizeof(rfcomm_rpn_data_t)]; 312 event[0] = RFCOMM_EVENT_PORT_CONFIGURATION; 313 event[1] = sizeof(event) - 2; 314 little_endian_store_16(event, 2, channel->rfcomm_cid); 315 if (remote){ 316 event[4] = 1; 317 (void)memcpy(&event[5], (uint8_t *) &channel->remote_rpn_data, sizeof(rfcomm_rpn_data_t)); 318 } else { 319 event[4] = 0; 320 (void)memcpy(&event[5], (uint8_t *) &channel->local_rpn_data, sizeof(rfcomm_rpn_data_t)); 321 } 322 hci_dump_btstack_event( event, sizeof(event)); 323 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 324 } 325 326 static void rfcomm_emit_can_send_now(rfcomm_channel_t *channel) { 327 log_debug("RFCOMM_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel->rfcomm_cid); 328 uint8_t event[4]; 329 event[0] = RFCOMM_EVENT_CAN_SEND_NOW; 330 event[1] = sizeof(event) - 2; 331 little_endian_store_16(event, 2, channel->rfcomm_cid); 332 hci_dump_btstack_event( event, sizeof(event)); 333 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, event, sizeof(event)); 334 } 335 336 // MARK RFCOMM RPN DATA HELPER 337 static void rfcomm_rpn_data_set_defaults(rfcomm_rpn_data_t * rpn_data){ 338 rpn_data->baud_rate = RPN_BAUD_9600; /* 9600 bps */ 339 rpn_data->flags = 0x03; /* 8-n-1 */ 340 rpn_data->flow_control = 0; /* no flow control */ 341 rpn_data->xon = 0xd1; /* XON */ 342 rpn_data->xoff = 0xd3; /* XOFF */ 343 rpn_data->parameter_mask_0 = 0x7f; /* parameter mask, all values set */ 344 rpn_data->parameter_mask_1 = 0x3f; /* parameter mask, all values set */ 345 } 346 347 static void rfcomm_rpn_data_update(rfcomm_rpn_data_t * dest, rfcomm_rpn_data_t * src){ 348 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_BAUD){ 349 dest->baud_rate = src->baud_rate; 350 } 351 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_DATA_BITS){ 352 dest->flags = (dest->flags & 0xfc) | (src->flags & 0x03); 353 } 354 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_STOP_BITS){ 355 dest->flags = (dest->flags & 0xfb) | (src->flags & 0x04); 356 } 357 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY){ 358 dest->flags = (dest->flags & 0xf7) | (src->flags & 0x08); 359 } 360 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_PARITY_TYPE){ 361 dest->flags = (dest->flags & 0xcf) | (src->flags & 0x30); 362 } 363 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XON_CHAR){ 364 dest->xon = src->xon; 365 } 366 if (src->parameter_mask_0 & RPN_PARAM_MASK_0_XOFF_CHAR){ 367 dest->xoff = src->xoff; 368 } 369 uint8_t mask = src->parameter_mask_1 & 0x3f; 370 dest->flow_control = (dest->flow_control & ~mask) | (src->flow_control & mask); 371 // always copy parameter mask, too. informative for client, needed for response 372 dest->parameter_mask_0 = src->parameter_mask_0; 373 dest->parameter_mask_1 = src->parameter_mask_1; 374 } 375 // MARK: RFCOMM MULTIPLEXER HELPER 376 377 static uint16_t rfcomm_max_frame_size_for_l2cap_mtu(uint16_t l2cap_mtu){ 378 // Assume RFCOMM header without credits and 2 byte (14 bit) length field 379 uint16_t max_frame_size = l2cap_mtu - 5; 380 log_info("rfcomm_max_frame_size_for_l2cap_mtu: %u -> %u", l2cap_mtu, max_frame_size); 381 return max_frame_size; 382 } 383 384 static void rfcomm_multiplexer_initialize(rfcomm_multiplexer_t *multiplexer){ 385 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 386 multiplexer->fcon = 1; 387 multiplexer->send_dm_for_dlci = 0; 388 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(l2cap_max_mtu()); 389 multiplexer->test_data_len = 0; 390 multiplexer->nsc_command = 0; 391 } 392 393 static rfcomm_multiplexer_t * rfcomm_multiplexer_create_for_addr(bd_addr_t addr){ 394 395 // alloc structure 396 rfcomm_multiplexer_t * multiplexer = btstack_memory_rfcomm_multiplexer_get(); 397 if (!multiplexer) return NULL; 398 399 // fill in 400 rfcomm_multiplexer_initialize(multiplexer); 401 bd_addr_copy(multiplexer->remote_addr, addr); 402 403 // add to services list 404 btstack_linked_list_add(&rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 405 406 return multiplexer; 407 } 408 409 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_addr(bd_addr_t addr){ 410 btstack_linked_item_t *it; 411 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 412 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 413 // ignore multiplexer in shutdown 414 if (multiplexer->state == RFCOMM_MULTIPLEXER_SHUTTING_DOWN) continue; 415 if (bd_addr_cmp(addr, multiplexer->remote_addr) == 0) { 416 return multiplexer; 417 }; 418 } 419 return NULL; 420 } 421 422 static rfcomm_multiplexer_t * rfcomm_multiplexer_for_l2cap_cid(uint16_t l2cap_cid) { 423 btstack_linked_item_t *it; 424 for (it = (btstack_linked_item_t *) rfcomm_multiplexers; it ; it = it->next){ 425 rfcomm_multiplexer_t * multiplexer = ((rfcomm_multiplexer_t *) it); 426 if (multiplexer->l2cap_cid == l2cap_cid) { 427 return multiplexer; 428 }; 429 } 430 return NULL; 431 } 432 433 static int rfcomm_multiplexer_has_channels(rfcomm_multiplexer_t * multiplexer){ 434 btstack_linked_item_t *it; 435 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 436 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 437 if (channel->multiplexer == multiplexer) { 438 return 1; 439 } 440 } 441 return 0; 442 } 443 444 // MARK: RFCOMM CHANNEL HELPER 445 446 static void rfcomm_dump_channels(void){ 447 #ifdef ENABLE_LOG_INFO 448 btstack_linked_item_t * it; 449 int channels = 0; 450 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 451 rfcomm_channel_t * channel = (rfcomm_channel_t *) it; 452 log_info("Channel #%u: addr %p, state %u", channels, channel, channel->state); 453 channels++; 454 } 455 #endif 456 } 457 458 static void rfcomm_channel_initialize(rfcomm_channel_t *channel, rfcomm_multiplexer_t *multiplexer, 459 rfcomm_service_t *service, uint8_t server_channel){ 460 461 // set defaults for port configuration (even for services) 462 rfcomm_rpn_data_set_defaults(&channel->local_rpn_data); 463 rfcomm_rpn_data_set_defaults(&channel->remote_rpn_data); 464 465 channel->state = RFCOMM_CHANNEL_CLOSED; 466 channel->state_var = RFCOMM_CHANNEL_STATE_VAR_NONE; 467 468 channel->multiplexer = multiplexer; 469 channel->rfcomm_cid = rfcomm_next_client_cid(); 470 channel->max_frame_size = multiplexer->max_frame_size; 471 472 channel->credits_incoming = 0; 473 channel->credits_outgoing = 0; 474 475 // incoming flow control not active 476 channel->new_credits_incoming = RFCOMM_CREDITS; 477 channel->incoming_flow_control = 0; 478 479 // nothing to send 480 channel->local_line_status = RFCOMM_RLS_STATUS_INVALID; 481 channel->remote_line_status = RFCOMM_RLS_STATUS_INVALID; 482 483 // modem status - ea=1,fc=0,rtc=1,rtr=1,ic=0,dv=1 484 channel->local_modem_status = 0x8d; 485 channel->remote_modem_status = 0x8d; 486 487 channel->service = service; 488 if (service) { 489 // incoming connection 490 channel->dlci = (server_channel << 1) | multiplexer->outgoing; 491 if (channel->max_frame_size > service->max_frame_size) { 492 channel->max_frame_size = service->max_frame_size; 493 } 494 channel->incoming_flow_control = service->incoming_flow_control; 495 channel->new_credits_incoming = service->incoming_initial_credits; 496 channel->packet_handler = service->packet_handler; 497 } else { 498 // outgoing connection 499 channel->dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 500 } 501 } 502 503 // service == NULL -> outgoing channel 504 static rfcomm_channel_t * rfcomm_channel_create(rfcomm_multiplexer_t * multiplexer, 505 rfcomm_service_t * service, uint8_t server_channel){ 506 507 log_info("rfcomm_channel_create for service %p, channel %u --- list of channels:", service, server_channel); 508 rfcomm_dump_channels(); 509 510 // alloc structure 511 rfcomm_channel_t * channel = btstack_memory_rfcomm_channel_get(); 512 if (!channel) return NULL; 513 514 // fill in 515 rfcomm_channel_initialize(channel, multiplexer, service, server_channel); 516 517 // add to services list 518 btstack_linked_list_add(&rfcomm_channels, (btstack_linked_item_t *) channel); 519 520 return channel; 521 } 522 523 static void rfcomm_notify_channel_can_send(void){ 524 btstack_linked_list_iterator_t it; 525 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 526 while (btstack_linked_list_iterator_has_next(&it)){ 527 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 528 if (!channel->waiting_for_can_send_now) continue; // didn't try to send yet 529 if (!rfcomm_channel_can_send(channel)) continue; // or cannot yet either 530 531 channel->waiting_for_can_send_now = 0; 532 rfcomm_emit_can_send_now(channel); 533 } 534 } 535 536 static rfcomm_channel_t * rfcomm_channel_for_multiplexer_and_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci){ 537 btstack_linked_item_t *it; 538 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 539 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 540 if ((channel->dlci == dlci) && (channel->multiplexer == multiplexer)) { 541 return channel; 542 }; 543 } 544 return NULL; 545 } 546 547 static rfcomm_service_t * rfcomm_service_for_channel(uint8_t server_channel){ 548 btstack_linked_item_t *it; 549 for (it = (btstack_linked_item_t *) rfcomm_services; it ; it = it->next){ 550 rfcomm_service_t * service = ((rfcomm_service_t *) it); 551 if ( service->server_channel == server_channel){ 552 return service; 553 }; 554 } 555 return NULL; 556 } 557 558 // MARK: RFCOMM SEND 559 560 /** 561 * @param credits - only used for RFCOMM flow control in UIH wiht P/F = 1 562 */ 563 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){ 564 565 if (!l2cap_can_send_packet_now(multiplexer->l2cap_cid)) return BTSTACK_ACL_BUFFERS_FULL; 566 567 #ifdef RFCOMM_USE_OUTGOING_BUFFER 568 uint8_t * rfcomm_out_buffer = outgoing_buffer; 569 #else 570 l2cap_reserve_packet_buffer(); 571 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 572 #endif 573 574 uint16_t pos = 0; 575 uint8_t crc_fields = 3; 576 577 rfcomm_out_buffer[pos++] = address; 578 rfcomm_out_buffer[pos++] = control; 579 580 // length field can be 1 or 2 octets 581 if (len < 128){ 582 rfcomm_out_buffer[pos++] = (len << 1)| 1; // bits 0-6 583 } else { 584 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 585 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 586 crc_fields++; 587 } 588 589 // add credits for UIH frames when PF bit is set 590 if (control == BT_RFCOMM_UIH_PF){ 591 rfcomm_out_buffer[pos++] = credits; 592 } 593 594 // copy actual data 595 if (len) { 596 (void)memcpy(&rfcomm_out_buffer[pos], data, len); 597 pos += len; 598 } 599 600 // UIH frames only calc FCS over address + control (5.1.1) 601 if ((control & 0xef) == BT_RFCOMM_UIH){ 602 crc_fields = 2; 603 } 604 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, crc_fields); // calc fcs 605 606 #ifdef RFCOMM_USE_OUTGOING_BUFFER 607 int err = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 608 #else 609 int err = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 610 #endif 611 612 return err; 613 } 614 615 // simplified version of rfcomm_send_packet_for_multiplexer for prepared rfcomm packet (UIH, 2 byte len, no credits) 616 static uint8_t rfcomm_send_uih_prepared(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t len){ 617 618 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 619 uint8_t control = BT_RFCOMM_UIH; 620 621 #ifdef RFCOMM_USE_OUTGOING_BUFFER 622 uint8_t * rfcomm_out_buffer = outgoing_buffer; 623 #else 624 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 625 #endif 626 627 uint16_t pos = 0; 628 rfcomm_out_buffer[pos++] = address; 629 rfcomm_out_buffer[pos++] = control; 630 rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 631 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 632 633 // actual data is already in place 634 pos += len; 635 636 // UIH frames only calc FCS over address + control (5.1.1) 637 rfcomm_out_buffer[pos++] = btstack_crc8_calc(rfcomm_out_buffer, 2); // calc fcs 638 639 #ifdef RFCOMM_USE_OUTGOING_BUFFER 640 uint8_t status = l2cap_send(multiplexer->l2cap_cid, rfcomm_out_buffer, pos); 641 #else 642 uint8_t status = l2cap_send_prepared(multiplexer->l2cap_cid, pos); 643 #endif 644 645 return status; 646 } 647 648 // C/R Flag in Address 649 // - terms: initiator = station that creates multiplexer with SABM 650 // - terms: responder = station that responds to multiplexer setup with UA 651 // "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" 652 // - command initiator = 1 /response responder = 1 653 // - command responder = 0 /response initiator = 0 654 // "For UIH frames, the C/R bit is always set according to section 5.4.3.1 in GSM 07.10. 655 // This applies independently of what is contained wthin the UIH frames, either data or control messages." 656 // - c/r = 1 for frames by initiating station, 0 = for frames by responding station 657 658 // C/R Flag in Message 659 // "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." 660 // - If the C/R bit is set to 1 the message is a command 661 // - if it is set to 0 the message is a response. 662 663 // temp/old messge construction 664 665 // new object oriented version 666 static int rfcomm_send_sabm(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 667 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 668 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_SABM, 0, NULL, 0); 669 } 670 671 static int rfcomm_send_disc(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 672 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); // command 673 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DISC, 0, NULL, 0); 674 } 675 676 static int rfcomm_send_ua(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 677 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 678 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UA, 0, NULL, 0); 679 } 680 681 static int rfcomm_send_dm_pf(rfcomm_multiplexer_t *multiplexer, uint8_t dlci){ 682 uint8_t address = (1 << 0) | ((multiplexer->outgoing ^ 1) << 1) | (dlci << 2); // response 683 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_DM_PF, 0, NULL, 0); 684 } 685 686 static int rfcomm_send_uih_fc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t fcon) { 687 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 688 uint8_t payload[2]; 689 uint8_t pos = 0; 690 payload[pos++] = fcon ? BT_RFCOMM_FCON_RSP : BT_RFCOMM_FCOFF_RSP; 691 payload[pos++] = (0 << 1) | 1; // len 692 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 693 } 694 695 // static int rfcomm_send_uih_test_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 696 // uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 697 // uint8_t payload[2+len]; 698 // uint8_t pos = 0; 699 // payload[pos++] = BT_RFCOMM_TEST_CMD; 700 // payload[pos++] = (len + 1) << 1 | 1; // len 701 // memcpy(&payload[pos], data, len); 702 // pos += len; 703 // return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 704 // } 705 706 static int rfcomm_send_uih_test_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t * data, uint16_t len) { 707 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 708 uint8_t payload[2+RFCOMM_TEST_DATA_MAX_LEN]; 709 uint8_t pos = 0; 710 payload[pos++] = BT_RFCOMM_TEST_RSP; 711 if (len > RFCOMM_TEST_DATA_MAX_LEN) { 712 len = RFCOMM_TEST_DATA_MAX_LEN; 713 } 714 payload[pos++] = (len << 1) | 1; // len 715 (void)memcpy(&payload[pos], data, len); 716 pos += len; 717 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 718 } 719 720 static int rfcomm_send_uih_msc_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 721 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 722 uint8_t payload[4]; 723 uint8_t pos = 0; 724 payload[pos++] = BT_RFCOMM_MSC_CMD; 725 payload[pos++] = (2 << 1) | 1; // len 726 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 727 payload[pos++] = signals; 728 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 729 } 730 731 static int rfcomm_send_uih_msc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t signals) { 732 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 733 uint8_t payload[4]; 734 uint8_t pos = 0; 735 payload[pos++] = BT_RFCOMM_MSC_RSP; 736 payload[pos++] = (2 << 1) | 1; // len 737 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 738 payload[pos++] = signals; 739 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 740 } 741 742 static int rfcomm_send_uih_nsc_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t command) { 743 uint8_t address = (1 << 0) | (multiplexer->outgoing<< 1); 744 uint8_t payload[3]; 745 uint8_t pos = 0; 746 payload[pos++] = BT_RFCOMM_NSC_RSP; 747 payload[pos++] = (1 << 1) | 1; // len 748 payload[pos++] = command; 749 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 750 } 751 752 static int rfcomm_send_uih_pn_command(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint16_t max_frame_size){ 753 uint8_t payload[10]; 754 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 755 uint8_t pos = 0; 756 payload[pos++] = BT_RFCOMM_PN_CMD; 757 payload[pos++] = (8 << 1) | 1; // len 758 payload[pos++] = dlci; 759 payload[pos++] = 0xf0; // pre-defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 760 payload[pos++] = 0; // priority 761 payload[pos++] = 0; // max 60 seconds ack 762 payload[pos++] = max_frame_size & 0xff; // max framesize low 763 payload[pos++] = max_frame_size >> 8; // max framesize high 764 payload[pos++] = 0x00; // number of retransmissions 765 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 766 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 767 } 768 769 // "The response may not change the DLCI, the priority, the convergence layer, or the timer value." rfcomm_tutorial.pdf 770 static int rfcomm_send_uih_pn_response(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, 771 uint8_t priority, uint16_t max_frame_size){ 772 uint8_t payload[10]; 773 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 774 uint8_t pos = 0; 775 payload[pos++] = BT_RFCOMM_PN_RSP; 776 payload[pos++] = (8 << 1) | 1; // len 777 payload[pos++] = dlci; 778 payload[pos++] = 0xe0; // pre defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM 779 payload[pos++] = priority; // priority 780 payload[pos++] = 0; // max 60 seconds ack 781 payload[pos++] = max_frame_size & 0xff; // max framesize low 782 payload[pos++] = max_frame_size >> 8; // max framesize high 783 payload[pos++] = 0x00; // number of retransmissions 784 payload[pos++] = 0x00; // (unused error recovery window) initial number of credits 785 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 786 } 787 788 static int rfcomm_send_uih_rls_cmd(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 789 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 790 uint8_t payload[4]; 791 uint8_t pos = 0; 792 payload[pos++] = BT_RFCOMM_RLS_CMD; 793 payload[pos++] = (2 << 1) | 1; // len 794 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 795 payload[pos++] = line_status; 796 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 797 } 798 799 static int rfcomm_send_uih_rls_rsp(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t line_status) { 800 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 801 uint8_t payload[4]; 802 uint8_t pos = 0; 803 payload[pos++] = BT_RFCOMM_RLS_RSP; 804 payload[pos++] = (2 << 1) | 1; // len 805 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 806 payload[pos++] = line_status; 807 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 808 } 809 810 static int rfcomm_send_uih_rpn_config(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 811 uint8_t payload[10]; 812 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 813 uint8_t pos = 0; 814 payload[pos++] = BT_RFCOMM_RPN_CMD; 815 payload[pos++] = (8 << 1) | 1; // len 816 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 817 payload[pos++] = rpn_data->baud_rate; 818 payload[pos++] = rpn_data->flags; 819 payload[pos++] = rpn_data->flow_control; 820 payload[pos++] = rpn_data->xon; 821 payload[pos++] = rpn_data->xoff; 822 payload[pos++] = rpn_data->parameter_mask_0; 823 payload[pos++] = rpn_data->parameter_mask_1; 824 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 825 } 826 827 static int rfcomm_send_uih_rpn_query(rfcomm_multiplexer_t *multiplexer, uint8_t dlci) { 828 uint8_t payload[3]; 829 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 830 uint8_t pos = 0; 831 payload[pos++] = BT_RFCOMM_RPN_CMD; 832 payload[pos++] = (1 << 1) | 1; // len 833 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 834 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 835 } 836 837 static int rfcomm_send_uih_rpn_response(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, rfcomm_rpn_data_t *rpn_data) { 838 uint8_t payload[10]; 839 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1); 840 uint8_t pos = 0; 841 payload[pos++] = BT_RFCOMM_RPN_RSP; 842 payload[pos++] = (8 << 1) | 1; // len 843 payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); // CMD => C/R = 1 844 payload[pos++] = rpn_data->baud_rate; 845 payload[pos++] = rpn_data->flags; 846 payload[pos++] = rpn_data->flow_control; 847 payload[pos++] = rpn_data->xon; 848 payload[pos++] = rpn_data->xoff; 849 payload[pos++] = rpn_data->parameter_mask_0; 850 payload[pos++] = rpn_data->parameter_mask_1; 851 return rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); 852 } 853 854 static void rfcomm_send_uih_credits(rfcomm_multiplexer_t *multiplexer, uint8_t dlci, uint8_t credits){ 855 uint8_t address = (1 << 0) | (multiplexer->outgoing << 1) | (dlci << 2); 856 rfcomm_send_packet_for_multiplexer(multiplexer, address, BT_RFCOMM_UIH_PF, credits, NULL, 0); 857 } 858 859 // depending on channel state emit channel opened with status or channel closed 860 static void rfcomm_channel_emit_final_event(rfcomm_channel_t * channel, uint8_t status){ 861 // emit appropriate events 862 switch(channel->state){ 863 case RFCOMM_CHANNEL_OPEN: 864 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 865 rfcomm_emit_channel_closed(channel); 866 break; 867 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 868 // remote didn't wait until we send the UA disc 869 // close event already emitted 870 break; 871 default: 872 rfcomm_emit_channel_opened(channel, status); 873 break; 874 } 875 } 876 877 // MARK: RFCOMM MULTIPLEXER 878 static void rfcomm_multiplexer_free(rfcomm_multiplexer_t * multiplexer){ 879 btstack_linked_list_remove( &rfcomm_multiplexers, (btstack_linked_item_t *) multiplexer); 880 btstack_memory_rfcomm_multiplexer_free(multiplexer); 881 } 882 883 static void rfcomm_multiplexer_finalize(rfcomm_multiplexer_t * multiplexer){ 884 // close and remove all channels 885 btstack_linked_item_t *it = (btstack_linked_item_t *) &rfcomm_channels; 886 while (it->next){ 887 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 888 if (channel->multiplexer == multiplexer) { 889 // emit open with status or closed 890 rfcomm_channel_emit_final_event(channel, RFCOMM_MULTIPLEXER_STOPPED); 891 // remove from list 892 it->next = it->next->next; 893 // free channel struct 894 btstack_memory_rfcomm_channel_free(channel); 895 } else { 896 it = it->next; 897 } 898 } 899 900 // remove mutliplexer 901 rfcomm_multiplexer_free(multiplexer); 902 } 903 904 static void rfcomm_multiplexer_opened(rfcomm_multiplexer_t *multiplexer){ 905 log_info("Multiplexer up and running"); 906 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 907 908 const rfcomm_channel_event_t event = { CH_EVT_MULTIPLEXER_READY, 0}; 909 910 // transition of channels that wait for multiplexer 911 btstack_linked_item_t *it; 912 for (it = (btstack_linked_item_t *) rfcomm_channels; it ; it = it->next){ 913 rfcomm_channel_t * channel = ((rfcomm_channel_t *) it); 914 if (channel->multiplexer != multiplexer) continue; 915 int rfcomm_channel_valid = 1; 916 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 917 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 918 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 919 } 920 } 921 922 // request can send now for multiplexer if ready 923 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 924 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 925 } 926 } 927 928 static void rfcomm_handle_can_send_now(uint16_t l2cap_cid){ 929 930 log_debug("can_send_now enter: %u", l2cap_cid); 931 932 btstack_linked_list_iterator_t it; 933 int token_consumed = 0; 934 935 // forward token to multiplexer 936 btstack_linked_list_iterator_init(&it, &rfcomm_multiplexers); 937 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 938 rfcomm_multiplexer_t * multiplexer = (rfcomm_multiplexer_t *) btstack_linked_list_iterator_next(&it); 939 if (multiplexer->l2cap_cid != l2cap_cid) continue; 940 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 941 log_debug("can_send_now enter: multiplexer token"); 942 token_consumed = 1; 943 rfcomm_multiplexer_state_machine(multiplexer, MULT_EV_READY_TO_SEND); 944 } 945 } 946 947 // forward token to channel state machine 948 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 949 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 950 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 951 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 952 // channel state machine 953 if (rfcomm_channel_ready_to_send(channel)){ 954 log_debug("can_send_now enter: channel token"); 955 token_consumed = 1; 956 const rfcomm_channel_event_t event = { CH_EVT_READY_TO_SEND, 0 }; 957 int rfcomm_channel_valid = 1; 958 rfcomm_channel_state_machine_with_channel(channel, &event, &rfcomm_channel_valid); 959 } 960 } 961 962 // forward token to client 963 btstack_linked_list_iterator_init(&it, &rfcomm_channels); 964 while (!token_consumed && btstack_linked_list_iterator_has_next(&it)){ 965 rfcomm_channel_t * channel = (rfcomm_channel_t *) btstack_linked_list_iterator_next(&it); 966 if (channel->multiplexer->l2cap_cid != l2cap_cid) continue; 967 // client waiting for can send now 968 if (!channel->waiting_for_can_send_now) continue; 969 if ((channel->multiplexer->fcon & 1) == 0) continue; 970 if (!channel->credits_outgoing){ 971 log_debug("can_send_now waiting to send but no credits (ignore)"); 972 continue; 973 } 974 975 log_debug("can_send_now enter: client token"); 976 token_consumed = 1; 977 channel->waiting_for_can_send_now = 0; 978 rfcomm_emit_can_send_now(channel); 979 } 980 981 // if token was consumed, request another one 982 if (token_consumed) { 983 l2cap_request_can_send_now_event(l2cap_cid); 984 } 985 986 log_debug("can_send_now exit"); 987 } 988 989 static void rfcomm_multiplexer_set_state_and_request_can_send_now_event(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_STATE state){ 990 multiplexer->state = state; 991 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 992 } 993 994 /** 995 * @return handled packet 996 */ 997 static int rfcomm_hci_event_handler(uint8_t *packet, uint16_t size){ 998 999 UNUSED(size); // ok: handling own l2cap events 1000 1001 bd_addr_t event_addr; 1002 uint16_t l2cap_cid; 1003 hci_con_handle_t con_handle; 1004 rfcomm_multiplexer_t *multiplexer = NULL; 1005 uint8_t status; 1006 1007 switch (hci_event_packet_get_type(packet)) { 1008 1009 // accept incoming rfcomm connection if no multiplexer exists yet 1010 case L2CAP_EVENT_INCOMING_CONNECTION: 1011 l2cap_event_incoming_connection_get_address(packet, event_addr); 1012 con_handle = l2cap_event_incoming_connection_get_handle(packet); 1013 l2cap_cid = l2cap_event_incoming_connection_get_local_cid(packet); 1014 1015 btstack_assert(l2cap_event_incoming_connection_get_psm(packet) == BLUETOOTH_PROTOCOL_RFCOMM); 1016 1017 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1018 1019 if (multiplexer) { 1020 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => decline - multiplexer already exists", l2cap_cid); 1021 l2cap_decline_connection(l2cap_cid); 1022 return 1; 1023 } 1024 1025 // create and inititialize new multiplexer instance (incoming) 1026 multiplexer = rfcomm_multiplexer_create_for_addr(event_addr); 1027 if (!multiplexer){ 1028 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => decline - no memory left", l2cap_cid); 1029 l2cap_decline_connection(l2cap_cid); 1030 return 1; 1031 } 1032 1033 multiplexer->con_handle = con_handle; 1034 multiplexer->l2cap_cid = l2cap_cid; 1035 // 1036 multiplexer->state = RFCOMM_MULTIPLEXER_W4_SABM_0; 1037 log_info("RFCOMM incoming (l2cap_cid 0x%02x) => accept", l2cap_cid); 1038 1039 #ifdef RFCOMM_USE_ERTM 1040 // request 1041 rfcomm_ertm_request_t request; 1042 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 1043 (void)memcpy(request.addr, event_addr, 6); 1044 request.ertm_id = rfcomm_next_ertm_id(); 1045 if (rfcomm_ertm_request_callback){ 1046 (*rfcomm_ertm_request_callback)(&request); 1047 } 1048 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 1049 multiplexer->ertm_id = request.ertm_id; 1050 l2cap_ertm_accept_connection(l2cap_cid, request.ertm_config, request.ertm_buffer, request.ertm_buffer_size); 1051 return 1; 1052 } 1053 #endif 1054 1055 l2cap_accept_connection(l2cap_cid); 1056 return 1; 1057 1058 // l2cap connection opened -> store l2cap_cid, remote_addr 1059 case L2CAP_EVENT_CHANNEL_OPENED: 1060 1061 btstack_assert(l2cap_event_channel_opened_get_psm(packet) == BLUETOOTH_PROTOCOL_RFCOMM); 1062 1063 status = l2cap_event_channel_opened_get_status(packet); 1064 log_info("channel opened, status %u", status); 1065 1066 // get multiplexer for remote addr 1067 con_handle = l2cap_event_channel_opened_get_handle(packet); 1068 l2cap_cid = l2cap_event_channel_opened_get_local_cid(packet); 1069 l2cap_event_channel_opened_get_address(packet, event_addr); 1070 multiplexer = rfcomm_multiplexer_for_addr(event_addr); 1071 if (!multiplexer) { 1072 log_error("channel opened but no multiplexer prepared"); 1073 return 1; 1074 } 1075 1076 // set con handle for outgoing (already set for incoming) 1077 multiplexer->con_handle = con_handle; 1078 1079 // on l2cap open error discard everything 1080 if (status){ 1081 1082 // mark multiplexer as shutting down 1083 multiplexer->state = RFCOMM_MULTIPLEXER_SHUTTING_DOWN; 1084 1085 // emit rfcomm_channel_opened with status and free channel 1086 // note: repeatedly go over list until full iteration causes no further change 1087 int done; 1088 do { 1089 done = 1; 1090 btstack_linked_item_t * it = (btstack_linked_item_t *) &rfcomm_channels; 1091 while (it->next) { 1092 rfcomm_channel_t * channel = (rfcomm_channel_t *) it->next; 1093 if (channel->multiplexer == multiplexer){ 1094 done = 0; 1095 rfcomm_emit_channel_opened(channel, status); 1096 btstack_linked_list_remove(&rfcomm_channels, (btstack_linked_item_t *) channel); 1097 btstack_memory_rfcomm_channel_free(channel); 1098 break; 1099 } else { 1100 it = it->next; 1101 } 1102 } 1103 } while (!done); 1104 1105 // free multiplexer 1106 rfcomm_multiplexer_free(multiplexer); 1107 return 1; 1108 } 1109 1110 // following could be: rfcomm_multiplexer_state_machine(..., EVENT_L2CAP_OPENED) 1111 1112 // set max frame size based on l2cap MTU 1113 multiplexer->max_frame_size = rfcomm_max_frame_size_for_l2cap_mtu(little_endian_read_16(packet, 17)); 1114 1115 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_CONNECT) { 1116 log_info("channel opened: outgoing connection"); 1117 multiplexer->l2cap_cid = l2cap_cid; 1118 // send SABM #0 1119 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_SABM_0); 1120 } 1121 return 1; 1122 1123 // l2cap disconnect -> state = RFCOMM_MULTIPLEXER_CLOSED; 1124 1125 // Notify channel packet handler if they can send now 1126 case L2CAP_EVENT_CAN_SEND_NOW: 1127 l2cap_cid = l2cap_event_can_send_now_get_local_cid(packet); 1128 rfcomm_handle_can_send_now(l2cap_cid); 1129 return 1; 1130 1131 case L2CAP_EVENT_CHANNEL_CLOSED: 1132 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 1133 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1134 log_info("channel closed cid 0x%0x, mult %p", l2cap_cid, multiplexer); 1135 if (!multiplexer) break; 1136 log_info("channel closed state %u", multiplexer->state); 1137 // no need to call l2cap_disconnect here, as it's already closed 1138 rfcomm_multiplexer_finalize(multiplexer); 1139 return 1; 1140 1141 #ifdef RFCOMM_USE_ERTM 1142 case L2CAP_EVENT_ERTM_BUFFER_RELEASED: 1143 l2cap_cid = l2cap_event_ertm_buffer_released_get_local_cid(packet); 1144 multiplexer = rfcomm_multiplexer_for_l2cap_cid(l2cap_cid); 1145 if (multiplexer) { 1146 log_info("buffer for ertm id %u released", multiplexer->ertm_id); 1147 if (rfcomm_ertm_released_callback){ 1148 (*rfcomm_ertm_released_callback)(multiplexer->ertm_id); 1149 } 1150 } 1151 break; 1152 #endif 1153 1154 default: 1155 break; 1156 } 1157 return 0; 1158 } 1159 1160 static int rfcomm_multiplexer_l2cap_packet_handler(uint16_t channel, uint8_t *packet, uint16_t size){ 1161 // get or create a multiplexer for a certain device 1162 rfcomm_multiplexer_t *multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1163 if (!multiplexer) return 0; 1164 1165 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1166 1167 if (size < 3) return 0; 1168 1169 // but only care for multiplexer control channel 1170 uint8_t frame_dlci = packet[0] >> 2; 1171 if (frame_dlci) return 0; 1172 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1173 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1174 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1175 switch (packet[1]){ 1176 1177 case BT_RFCOMM_SABM: 1178 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_SABM_0){ 1179 log_info("Received SABM #0"); 1180 multiplexer->outgoing = 0; 1181 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0); 1182 return 1; 1183 } 1184 break; 1185 1186 case BT_RFCOMM_UA: 1187 if (multiplexer->state == RFCOMM_MULTIPLEXER_W4_UA_0) { 1188 // UA #0 -> send UA #0, state = RFCOMM_MULTIPLEXER_OPEN 1189 log_info("Received UA #0 "); 1190 rfcomm_multiplexer_opened(multiplexer); 1191 return 1; 1192 } 1193 break; 1194 1195 case BT_RFCOMM_DISC: 1196 // DISC #0 -> send UA #0, close multiplexer 1197 log_info("Received DISC #0, (ougoing = %u)", multiplexer->outgoing); 1198 rfcomm_multiplexer_set_state_and_request_can_send_now_event(multiplexer, RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC); 1199 return 1; 1200 1201 case BT_RFCOMM_DM: 1202 // DM #0 - we shouldn't get this, just give up 1203 log_info("Received DM #0"); 1204 log_info("-> Closing down multiplexer"); 1205 rfcomm_multiplexer_finalize(multiplexer); 1206 l2cap_disconnect(l2cap_cid); 1207 return 1; 1208 1209 case BT_RFCOMM_UIH: 1210 if (payload_offset >= size) return 0; 1211 1212 if (packet[payload_offset] == BT_RFCOMM_CLD_CMD){ 1213 // Multiplexer close down (CLD) -> close mutliplexer 1214 log_info("Received Multiplexer close down command"); 1215 log_info("-> Closing down multiplexer"); 1216 rfcomm_multiplexer_finalize(multiplexer); 1217 l2cap_disconnect(l2cap_cid); 1218 return 1; 1219 } 1220 switch (packet[payload_offset]){ 1221 case BT_RFCOMM_CLD_CMD: 1222 // Multiplexer close down (CLD) -> close mutliplexer 1223 log_info("Received Multiplexer close down command"); 1224 log_info("-> Closing down multiplexer"); 1225 rfcomm_multiplexer_finalize(multiplexer); 1226 l2cap_disconnect(l2cap_cid); 1227 return 1; 1228 1229 case BT_RFCOMM_FCON_CMD: 1230 multiplexer->fcon = 0x81; 1231 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1232 return 1; 1233 1234 case BT_RFCOMM_FCOFF_CMD: 1235 multiplexer->fcon = 0x80; 1236 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1237 return 1; 1238 1239 case BT_RFCOMM_TEST_CMD: { 1240 if ((payload_offset + 1) >= size) return 0; // (1) 1241 log_info("Received test command"); 1242 int len = packet[payload_offset+1] >> 1; // length < 125 1243 if (len > RFCOMM_TEST_DATA_MAX_LEN){ 1244 len = RFCOMM_TEST_DATA_MAX_LEN; 1245 } 1246 // from (1) => (size - 1 - payload_offset) > 0 1247 len = btstack_min(len, size - 1 - payload_offset); // avoid information leak 1248 multiplexer->test_data_len = len; 1249 (void)memcpy(multiplexer->test_data, 1250 &packet[payload_offset + 2], len); 1251 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1252 return 1; 1253 } 1254 default: 1255 break; 1256 } 1257 break; 1258 1259 default: 1260 break; 1261 1262 } 1263 return 0; 1264 } 1265 1266 static int rfcomm_multiplexer_ready_to_send(rfcomm_multiplexer_t * multiplexer){ 1267 if (multiplexer->send_dm_for_dlci) return 1; 1268 if (multiplexer->nsc_command) return 1; 1269 if (multiplexer->fcon & 0x80) return 1; 1270 switch (multiplexer->state){ 1271 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1272 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1273 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1274 return 1; 1275 case RFCOMM_MULTIPLEXER_OPEN: 1276 if (multiplexer->test_data_len) { 1277 return 1; 1278 } 1279 break; 1280 default: 1281 break; 1282 } 1283 return 0; 1284 } 1285 1286 static void rfcomm_multiplexer_state_machine(rfcomm_multiplexer_t * multiplexer, RFCOMM_MULTIPLEXER_EVENT event){ 1287 1288 if (event != MULT_EV_READY_TO_SEND) return; 1289 1290 uint16_t l2cap_cid = multiplexer->l2cap_cid; 1291 1292 // process stored DM responses 1293 if (multiplexer->send_dm_for_dlci){ 1294 uint8_t dlci = multiplexer->send_dm_for_dlci; 1295 multiplexer->send_dm_for_dlci = 0; 1296 rfcomm_send_dm_pf(multiplexer, dlci); 1297 return; 1298 } 1299 1300 if (multiplexer->nsc_command){ 1301 uint8_t command = multiplexer->nsc_command; 1302 multiplexer->nsc_command = 0; 1303 rfcomm_send_uih_nsc_rsp(multiplexer, command); 1304 return; 1305 } 1306 1307 if (multiplexer->fcon & 0x80){ 1308 multiplexer->fcon &= 0x01; 1309 rfcomm_send_uih_fc_rsp(multiplexer, multiplexer->fcon); 1310 1311 if (multiplexer->fcon == 0) return; 1312 // trigger client to send again after sending FCon Response 1313 rfcomm_notify_channel_can_send(); 1314 return; 1315 } 1316 1317 switch (multiplexer->state) { 1318 case RFCOMM_MULTIPLEXER_SEND_SABM_0: 1319 log_info("Sending SABM #0 - (multi 0x%p)", multiplexer); 1320 multiplexer->state = RFCOMM_MULTIPLEXER_W4_UA_0; 1321 rfcomm_send_sabm(multiplexer, 0); 1322 break; 1323 case RFCOMM_MULTIPLEXER_SEND_UA_0: 1324 log_info("Sending UA #0"); 1325 multiplexer->state = RFCOMM_MULTIPLEXER_OPEN; 1326 rfcomm_send_ua(multiplexer, 0); 1327 1328 rfcomm_multiplexer_opened(multiplexer); 1329 break; 1330 case RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC: 1331 log_info("Sending UA #0"); 1332 log_info("Closing down multiplexer"); 1333 multiplexer->state = RFCOMM_MULTIPLEXER_CLOSED; 1334 rfcomm_send_ua(multiplexer, 0); 1335 1336 rfcomm_multiplexer_finalize(multiplexer); 1337 l2cap_disconnect(l2cap_cid); 1338 break; 1339 case RFCOMM_MULTIPLEXER_OPEN: 1340 // respond to test command 1341 if (multiplexer->test_data_len){ 1342 int len = multiplexer->test_data_len; 1343 log_info("Sending TEST Response with %u bytes", len); 1344 multiplexer->test_data_len = 0; 1345 rfcomm_send_uih_test_rsp(multiplexer, multiplexer->test_data, len); 1346 return; 1347 } 1348 break; 1349 default: 1350 break; 1351 } 1352 } 1353 1354 // MARK: RFCOMM CHANNEL 1355 1356 static void rfcomm_channel_send_credits(rfcomm_channel_t *channel, uint8_t credits){ 1357 channel->credits_incoming += credits; 1358 rfcomm_send_uih_credits(channel->multiplexer, channel->dlci, credits); 1359 } 1360 1361 static bool rfcomm_channel_can_send(rfcomm_channel_t * channel){ 1362 log_debug("cid 0x%04x, outgoing credits %u", channel->rfcomm_cid, channel->credits_outgoing); 1363 if (!channel->credits_outgoing) return false; 1364 if ((channel->multiplexer->fcon & 1) == 0) return false; 1365 return l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid) != 0; 1366 } 1367 1368 static void rfcomm_channel_opened(rfcomm_channel_t *rfChannel){ 1369 1370 log_info("opened"); 1371 1372 rfChannel->state = RFCOMM_CHANNEL_OPEN; 1373 rfcomm_emit_channel_opened(rfChannel, 0); 1374 rfcomm_emit_port_configuration(rfChannel, false); 1375 1376 // hack for problem detecting authentication failure 1377 rfcomm_multiplexer_t *multiplexer = rfChannel->multiplexer; 1378 multiplexer->at_least_one_connection = 1; 1379 1380 // request can send now if channel ready 1381 if (rfcomm_channel_ready_to_send(rfChannel)){ 1382 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1383 } 1384 } 1385 1386 static void rfcomm_channel_packet_handler_uih(rfcomm_multiplexer_t *multiplexer, uint8_t * packet, uint16_t size){ 1387 const uint8_t frame_dlci = packet[0] >> 2; 1388 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1389 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1390 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1391 int request_can_send_now = 0; 1392 1393 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, frame_dlci); 1394 if (!channel) return; 1395 1396 // handle new outgoing credits 1397 if (packet[1] == BT_RFCOMM_UIH_PF) { 1398 1399 // add them 1400 uint16_t new_credits = packet[3+length_offset]; 1401 channel->credits_outgoing += new_credits; 1402 log_info( "RFCOMM data UIH_PF, new credits channel 0x%02x: %u, now %u", channel->rfcomm_cid, new_credits, channel->credits_outgoing); 1403 1404 // notify channel statemachine 1405 rfcomm_channel_event_t channel_event = { CH_EVT_RCVD_CREDITS, 0 }; 1406 log_debug("state machine, waiting_for_can_send_now %u", channel->waiting_for_can_send_now); 1407 int rfcomm_channel_valid = 1; 1408 rfcomm_channel_state_machine_with_channel(channel, &channel_event, &rfcomm_channel_valid); 1409 if (rfcomm_channel_valid){ 1410 if (rfcomm_channel_ready_to_send(channel) || channel->waiting_for_can_send_now){ 1411 request_can_send_now = 1; 1412 } 1413 } 1414 } 1415 1416 // contains payload? 1417 if ((size - 1) > payload_offset){ 1418 1419 // log_info( "RFCOMM data UIH_PF, size %u, channel %p", size-payload_offset-1, rfChannel->connection); 1420 1421 // decrease incoming credit counter 1422 if (channel->credits_incoming > 0){ 1423 channel->credits_incoming--; 1424 } 1425 1426 // deliver payload 1427 (channel->packet_handler)(RFCOMM_DATA_PACKET, channel->rfcomm_cid, 1428 &packet[payload_offset], size-payload_offset-1); 1429 } 1430 1431 // automatically provide new credits to remote device, if no incoming flow control 1432 if (!channel->incoming_flow_control && (channel->credits_incoming < 5)){ 1433 channel->new_credits_incoming = RFCOMM_CREDITS; 1434 request_can_send_now = 1; 1435 } 1436 1437 if (request_can_send_now){ 1438 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1439 } 1440 } 1441 1442 static void rfcomm_channel_accept_pn(rfcomm_channel_t *channel, rfcomm_channel_event_pn_t *event){ 1443 // priority of client request 1444 channel->pn_priority = event->priority; 1445 1446 // new credits 1447 channel->credits_outgoing = event->credits_outgoing; 1448 1449 // negotiate max frame size 1450 if (channel->max_frame_size > channel->multiplexer->max_frame_size) { 1451 channel->max_frame_size = channel->multiplexer->max_frame_size; 1452 } 1453 if (channel->max_frame_size > event->max_frame_size) { 1454 channel->max_frame_size = event->max_frame_size; 1455 } 1456 1457 } 1458 1459 static void rfcomm_channel_finalize(rfcomm_channel_t *channel){ 1460 // remove from list 1461 btstack_linked_list_remove( &rfcomm_channels, (btstack_linked_item_t *) channel); 1462 1463 // free channel 1464 btstack_memory_rfcomm_channel_free(channel); 1465 } 1466 1467 static void rfcomm_channel_state_machine_with_dlci(rfcomm_multiplexer_t * multiplexer, uint8_t dlci, const rfcomm_channel_event_t *event){ 1468 1469 // TODO: if client max frame size is smaller than RFCOMM_DEFAULT_SIZE, send PN 1470 1471 1472 // lookup existing channel 1473 rfcomm_channel_t * channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 1474 1475 // log_info("rfcomm_channel_state_machine_with_dlci lookup dlci #%u = 0x%08x - event %u", dlci, (int) channel, event->type); 1476 1477 if (channel) { 1478 int rfcomm_channel_valid = 1; 1479 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1480 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1481 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1482 } 1483 return; 1484 } 1485 1486 // service registered? 1487 rfcomm_service_t * service = rfcomm_service_for_channel(dlci >> 1); 1488 // log_info("rfcomm_channel_state_machine_with_dlci service dlci #%u = 0x%08x", dlci, (int) service); 1489 if (!service) { 1490 // discard request by sending disconnected mode 1491 multiplexer->send_dm_for_dlci = dlci; 1492 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1493 return; 1494 } 1495 1496 // create channel for some events 1497 switch (event->type) { 1498 case CH_EVT_RCVD_SABM: 1499 case CH_EVT_RCVD_PN: 1500 case CH_EVT_RCVD_RPN_REQ: 1501 case CH_EVT_RCVD_RPN_CMD: 1502 // setup incoming channel 1503 channel = rfcomm_channel_create(multiplexer, service, dlci >> 1); 1504 if (!channel){ 1505 // discard request by sending disconnected mode 1506 multiplexer->send_dm_for_dlci = dlci; 1507 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1508 } 1509 break; 1510 default: 1511 break; 1512 } 1513 1514 if (!channel) { 1515 // discard request by sending disconnected mode 1516 multiplexer->send_dm_for_dlci = dlci; 1517 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1518 return; 1519 } 1520 1521 int rfcomm_channel_valid = 1; 1522 rfcomm_channel_state_machine_with_channel(channel, event, &rfcomm_channel_valid); 1523 if (rfcomm_channel_valid && rfcomm_channel_ready_to_send(channel)){ 1524 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1525 } 1526 } 1527 1528 static void rfcomm_channel_packet_handler(rfcomm_multiplexer_t * multiplexer, uint8_t *packet, uint16_t size){ 1529 1530 UNUSED(size); // ok: fixed format messages 1531 1532 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1533 const uint8_t frame_dlci = packet[0] >> 2; 1534 uint8_t message_dlci; // used by commands in UIH(_PF) packets 1535 uint8_t message_len; // " 1536 1537 // rfcomm: (1) command/control 1538 // -- credits_offset = 1 if command == BT_RFCOMM_UIH_PF 1539 const uint8_t credit_offset = ((packet[1] & BT_RFCOMM_UIH_PF) == BT_RFCOMM_UIH_PF) ? 1 : 0; // credits for uih_pf frames 1540 // rfcomm: (2) length. if bit 0 is cleared, 2 byte length is used. (little endian) 1541 const uint8_t length_offset = (packet[2] & 1) ^ 1; // to be used for pos >= 3 1542 // rfcomm: (3+length_offset) credits if credits_offset == 1 1543 // rfcomm: (3+length_offest+credits_offset) 1544 const uint8_t payload_offset = 3 + length_offset + credit_offset; 1545 1546 rfcomm_channel_event_t event; 1547 rfcomm_channel_event_pn_t event_pn; 1548 rfcomm_channel_event_rpn_t event_rpn; 1549 rfcomm_channel_event_msc_t event_msc; 1550 1551 // switch by rfcomm message type 1552 switch(packet[1]) { 1553 1554 case BT_RFCOMM_SABM: 1555 event.type = CH_EVT_RCVD_SABM; 1556 log_info("Received SABM #%u", frame_dlci); 1557 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1558 break; 1559 1560 case BT_RFCOMM_UA: 1561 event.type = CH_EVT_RCVD_UA; 1562 log_info("Received UA #%u",frame_dlci); 1563 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1564 break; 1565 1566 case BT_RFCOMM_DISC: 1567 event.type = CH_EVT_RCVD_DISC; 1568 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1569 break; 1570 1571 case BT_RFCOMM_DM: 1572 case BT_RFCOMM_DM_PF: 1573 event.type = CH_EVT_RCVD_DM; 1574 rfcomm_channel_state_machine_with_dlci(multiplexer, frame_dlci, &event); 1575 break; 1576 1577 case BT_RFCOMM_UIH_PF: 1578 case BT_RFCOMM_UIH: 1579 1580 message_len = packet[payload_offset+1] >> 1; 1581 1582 switch (packet[payload_offset]) { 1583 case BT_RFCOMM_PN_CMD: 1584 message_dlci = packet[payload_offset+2]; 1585 event_pn.super.type = CH_EVT_RCVD_PN; 1586 event_pn.priority = packet[payload_offset+4]; 1587 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1588 event_pn.credits_outgoing = packet[payload_offset+9]; 1589 log_info("Received UIH Parameter Negotiation Command for #%u, credits %u", 1590 message_dlci, event_pn.credits_outgoing); 1591 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1592 break; 1593 1594 case BT_RFCOMM_PN_RSP: 1595 message_dlci = packet[payload_offset+2]; 1596 event_pn.super.type = CH_EVT_RCVD_PN_RSP; 1597 event_pn.priority = packet[payload_offset+4]; 1598 event_pn.max_frame_size = little_endian_read_16(packet, payload_offset+6); 1599 event_pn.credits_outgoing = packet[payload_offset+9]; 1600 log_info("Received UIH Parameter Negotiation Response max frame %u, credits %u", 1601 event_pn.max_frame_size, event_pn.credits_outgoing); 1602 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_pn); 1603 break; 1604 1605 case BT_RFCOMM_MSC_CMD: 1606 message_dlci = packet[payload_offset+2] >> 2; 1607 event_msc.super.type = CH_EVT_RCVD_MSC_CMD; 1608 event_msc.modem_status = packet[payload_offset+3]; 1609 log_info("Received MSC CMD for #%u, ", message_dlci); 1610 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_msc); 1611 break; 1612 1613 case BT_RFCOMM_MSC_RSP: 1614 message_dlci = packet[payload_offset+2] >> 2; 1615 event.type = CH_EVT_RCVD_MSC_RSP; 1616 log_info("Received MSC RSP for #%u", message_dlci); 1617 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1618 break; 1619 1620 case BT_RFCOMM_RPN_CMD: 1621 message_dlci = packet[payload_offset+2] >> 2; 1622 switch (message_len){ 1623 case 1: 1624 log_info("Received Remote Port Negotiation Request for #%u", message_dlci); 1625 event.type = CH_EVT_RCVD_RPN_REQ; 1626 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, &event); 1627 break; 1628 case 8: 1629 log_info("Received Remote Port Negotiation Update for #%u", message_dlci); 1630 event_rpn.super.type = CH_EVT_RCVD_RPN_CMD; 1631 event_rpn.data = *(rfcomm_rpn_data_t*) &packet[payload_offset+3]; 1632 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rpn); 1633 break; 1634 default: 1635 break; 1636 } 1637 break; 1638 1639 case BT_RFCOMM_RPN_RSP: 1640 message_dlci = packet[payload_offset+2] >> 2; 1641 if (message_len != 8) break; 1642 event_rpn.super.type = CH_EVT_RCVD_RPN_RSP; 1643 event_rpn.data = *(rfcomm_rpn_data_t*) &packet[payload_offset+3]; 1644 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rpn); 1645 break; 1646 1647 case BT_RFCOMM_RLS_CMD: { 1648 log_info("Received RLS command"); 1649 message_dlci = packet[payload_offset+2] >> 2; 1650 rfcomm_channel_event_rls_t event_rls; 1651 event_rls.super.type = CH_EVT_RCVD_RLS_CMD; 1652 event_rls.line_status = packet[payload_offset+3]; 1653 rfcomm_channel_state_machine_with_dlci(multiplexer, message_dlci, (rfcomm_channel_event_t*) &event_rls); 1654 break; 1655 } 1656 1657 case BT_RFCOMM_RLS_RSP: 1658 log_info("Received RLS response"); 1659 break; 1660 1661 // Following commands are handled by rfcomm_multiplexer_l2cap_packet_handler 1662 // case BT_RFCOMM_TEST_CMD: 1663 // case BT_RFCOMM_FCOFF_CMD: 1664 // case BT_RFCOMM_FCON_CMD: 1665 // everything else is an not supported command 1666 default: { 1667 log_error("Received unknown UIH command packet - 0x%02x", packet[payload_offset]); 1668 multiplexer->nsc_command = packet[payload_offset]; 1669 break; 1670 } 1671 } 1672 break; 1673 1674 default: 1675 log_error("Received unknown RFCOMM message type %x", packet[1]); 1676 break; 1677 } 1678 1679 // trigger next action - example W4_PN_RSP: transition to SEND_SABM which only depends on "can send" 1680 if (rfcomm_multiplexer_ready_to_send(multiplexer)){ 1681 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 1682 } 1683 } 1684 1685 static void rfcomm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1686 1687 if (packet_type == HCI_EVENT_PACKET){ 1688 rfcomm_hci_event_handler(packet, size); 1689 return; 1690 } 1691 1692 // we only handle l2cap packets for: 1693 if (packet_type != L2CAP_DATA_PACKET) return; 1694 1695 // - multiplexer itself 1696 int handled = rfcomm_multiplexer_l2cap_packet_handler(channel, packet, size); 1697 1698 if (handled) return; 1699 1700 // - channel over open multiplexer 1701 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_l2cap_cid(channel); 1702 if ( (multiplexer == NULL) || (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN)) return; 1703 1704 // channel data ? 1705 // rfcomm: (0) addr [76543 server channel] [2 direction: initiator uses 1] [1 C/R: CMD by initiator = 1] [0 EA=1] 1706 const uint8_t frame_dlci = packet[0] >> 2; 1707 1708 if (frame_dlci && ((packet[1] == BT_RFCOMM_UIH) || (packet[1] == BT_RFCOMM_UIH_PF))) { 1709 rfcomm_channel_packet_handler_uih(multiplexer, packet, size); 1710 return; 1711 } 1712 1713 rfcomm_channel_packet_handler(multiplexer, packet, size); 1714 } 1715 1716 static int rfcomm_channel_ready_for_open(rfcomm_channel_t *channel){ 1717 // note: exchanging MSC isn't neccessary to consider channel open 1718 // note: having outgoing credits is also not necessary to consider channel open 1719 // 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); 1720 // if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP) == 0) return 0; 1721 // if (channel->credits_outgoing == 0) return 0; 1722 log_info("rfcomm_channel_ready_for_open state %u, flags needed %04x, current %08" PRIx32 ", rf credits %u", 1723 channel->state, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP, channel->state_var, channel->credits_outgoing); 1724 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP) == 0) return 0; 1725 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS) == 0) return 0; 1726 1727 return 1; 1728 } 1729 1730 static int rfcomm_channel_ready_for_incoming_dlc_setup(rfcomm_channel_t * channel){ 1731 log_info("rfcomm_channel_ready_for_incoming_dlc_setup state var %08" PRIx32, channel->state_var); 1732 // Client accept and SABM/UA is required, PN RSP is needed if PN was received 1733 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) == 0) return 0; 1734 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM ) == 0) return 0; 1735 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA ) != 0) return 0; 1736 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP ) != 0) return 0; 1737 return 1; 1738 } 1739 1740 inline static void rfcomm_channel_state_add(rfcomm_channel_t *channel, uint32_t flag){ 1741 channel->state_var |= flag; 1742 } 1743 inline static void rfcomm_channel_state_remove(rfcomm_channel_t *channel, uint32_t flag){ 1744 channel->state_var &= ~flag; 1745 } 1746 1747 static int rfcomm_channel_ready_to_send(rfcomm_channel_t * channel){ 1748 switch (channel->state){ 1749 case RFCOMM_CHANNEL_SEND_UIH_PN: 1750 log_debug("ch-ready: state %u", channel->state); 1751 return 1; 1752 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 1753 log_debug("ch-ready: state %u", channel->state); 1754 return 1; 1755 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 1756 log_debug("ch-ready: state %u", channel->state); 1757 return 1; 1758 case RFCOMM_CHANNEL_SEND_DISC: 1759 log_debug("ch-ready: state %u", channel->state); 1760 return 1; 1761 case RFCOMM_CHANNEL_SEND_DM: 1762 log_debug("ch-ready: state %u", channel->state); 1763 return 1; 1764 case RFCOMM_CHANNEL_OPEN: 1765 if (channel->new_credits_incoming) { 1766 log_debug("ch-ready: channel open & new_credits_incoming") ; 1767 return 1; 1768 } 1769 break; 1770 case RFCOMM_CHANNEL_DLC_SETUP: 1771 if (channel->state_var & ( 1772 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD | 1773 RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS 1774 )) { 1775 log_debug("ch-ready: channel dlc setup & send msc cmd or send credits") ; 1776 return 1; 1777 } 1778 break; 1779 1780 default: 1781 break; 1782 } 1783 1784 if (channel->state_var & ( 1785 RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP | 1786 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY | 1787 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG | 1788 RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE | 1789 RFCOMM_CHANNEL_STATE_VAR_SEND_UA | 1790 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD | 1791 RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP 1792 )){ 1793 log_debug("ch-ready: state %x, state var %x", channel->state, channel->state_var); 1794 return 1; 1795 } 1796 1797 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID) { 1798 log_debug("ch-ready: rls_line_status"); 1799 return 1; 1800 } 1801 1802 if (channel->remote_line_status != RFCOMM_RLS_STATUS_INVALID) { 1803 log_debug("ch-ready: rls_line_status"); 1804 return 1; 1805 } 1806 1807 return 0; 1808 } 1809 1810 1811 static void rfcomm_channel_state_machine_with_channel(rfcomm_channel_t *channel, const rfcomm_channel_event_t *event, int * out_channel_valid){ 1812 1813 // channel != NULL -> channel valid 1814 *out_channel_valid = 1; 1815 1816 rfcomm_multiplexer_t *multiplexer = channel->multiplexer; 1817 1818 // TODO: integrate in common switch 1819 if (event->type == CH_EVT_RCVD_DISC){ 1820 rfcomm_emit_channel_closed(channel); 1821 channel->state = RFCOMM_CHANNEL_SEND_UA_AFTER_DISC; 1822 return; 1823 } 1824 1825 // TODO: integrate in common switch 1826 if (event->type == CH_EVT_RCVD_DM){ 1827 log_info("Received DM message for #%u", channel->dlci); 1828 log_info("-> Closing channel locally for #%u", channel->dlci); 1829 rfcomm_channel_emit_final_event(channel, ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES); 1830 rfcomm_channel_finalize(channel); 1831 *out_channel_valid = 0; 1832 return; 1833 } 1834 1835 // remote port negotiation command - just accept everything for now 1836 // 1837 // "The RPN command can be used before a new DLC is opened and should be used whenever the port settings change." 1838 // "The RPN command is specified as optional in TS 07.10, but it is mandatory to recognize and respond to it in RFCOMM. 1839 // (Although the handling of individual settings are implementation-dependent.)" 1840 // 1841 1842 // TODO: integrate in common switch 1843 if (event->type == CH_EVT_RCVD_RPN_CMD){ 1844 // control port parameters 1845 rfcomm_channel_event_rpn_t *event_rpn = (rfcomm_channel_event_rpn_t*) event; 1846 rfcomm_rpn_data_update(&channel->local_rpn_data, &event_rpn->data); 1847 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1848 // notify client about new settings 1849 rfcomm_emit_port_configuration(channel, false); 1850 return; 1851 } 1852 1853 // TODO: integrate in common switch 1854 if (event->type == CH_EVT_RCVD_RPN_REQ){ 1855 // no values got accepted (no values have beens sent) 1856 channel->local_rpn_data.parameter_mask_0 = 0x00; 1857 channel->local_rpn_data.parameter_mask_1 = 0x00; 1858 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1859 return; 1860 } 1861 1862 if (event->type == CH_EVT_RCVD_RLS_CMD){ 1863 rfcomm_channel_event_rls_t * event_rls = (rfcomm_channel_event_rls_t*) event; 1864 channel->remote_line_status = event_rls->line_status & 0x0f; 1865 log_info("CH_EVT_RCVD_RLS_CMD remote line status 0x%0x", channel->remote_line_status); 1866 rfcomm_emit_remote_line_status(channel, channel->remote_line_status); 1867 return; 1868 } 1869 1870 // TODO: integrate in common switch 1871 if (event->type == CH_EVT_READY_TO_SEND){ 1872 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY){ 1873 log_info("Sending Remote Port Configuration Query for #%u", channel->dlci); 1874 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY); 1875 rfcomm_send_uih_rpn_query(channel->multiplexer, channel->dlci); 1876 return; 1877 } 1878 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG){ 1879 log_info("Sending Remote Port Configuration for #%u", channel->dlci); 1880 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG); 1881 rfcomm_send_uih_rpn_config(channel->multiplexer, channel->dlci, &channel->remote_rpn_data); 1882 return; 1883 } 1884 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE){ 1885 log_info("Sending Remote Port Negotiation RSP for #%u", channel->dlci); 1886 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RESPONSE); 1887 rfcomm_send_uih_rpn_response(multiplexer, channel->dlci, &channel->local_rpn_data); 1888 return; 1889 } 1890 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD){ 1891 log_info("Sending MSC CMD for #%u", channel->dlci); 1892 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 1893 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_CMD); 1894 rfcomm_send_uih_msc_cmd(multiplexer, channel->dlci , channel->local_modem_status); 1895 return; 1896 } 1897 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP){ 1898 log_info("Sending MSC RSP for #%u", channel->dlci); 1899 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 1900 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP); 1901 rfcomm_send_uih_msc_rsp(multiplexer, channel->dlci, channel->remote_modem_status); 1902 return; 1903 } 1904 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID){ 1905 log_info("Sending RLS CMD 0x%0x", channel->local_line_status); 1906 uint8_t line_status = channel->local_line_status; 1907 channel->local_line_status = RFCOMM_RLS_STATUS_INVALID; 1908 rfcomm_send_uih_rls_cmd(multiplexer, channel->dlci, line_status); 1909 return; 1910 } 1911 if (channel->remote_line_status != RFCOMM_RLS_STATUS_INVALID){ 1912 log_info("Sending RLS RSP 0x%0x", channel->remote_line_status); 1913 uint8_t line_status = channel->remote_line_status; 1914 channel->remote_line_status = RFCOMM_RLS_STATUS_INVALID; 1915 rfcomm_send_uih_rls_rsp(multiplexer, channel->dlci, line_status); 1916 return; 1917 } 1918 } 1919 1920 // emit MSC status to app 1921 if (event->type == CH_EVT_RCVD_MSC_CMD){ 1922 // notify client about new settings 1923 rfcomm_channel_event_msc_t *event_msc = (rfcomm_channel_event_msc_t*) event; 1924 uint8_t modem_status_event[5]; 1925 modem_status_event[0] = RFCOMM_EVENT_REMOTE_MODEM_STATUS; 1926 modem_status_event[1] = sizeof(event) - 2; 1927 little_endian_store_16(modem_status_event, 2, channel->rfcomm_cid); 1928 modem_status_event[4] = event_msc->modem_status; 1929 (channel->packet_handler)(HCI_EVENT_PACKET, channel->rfcomm_cid, (uint8_t*)&modem_status_event, sizeof(modem_status_event)); 1930 // no return, MSC_CMD will be handled by state machine below 1931 } 1932 1933 rfcomm_channel_event_pn_t * event_pn = (rfcomm_channel_event_pn_t*) event; 1934 1935 switch (channel->state) { 1936 case RFCOMM_CHANNEL_CLOSED: 1937 switch (event->type){ 1938 case CH_EVT_RCVD_SABM: 1939 log_info("-> Inform app"); 1940 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 1941 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1942 rfcomm_emit_connection_request(channel); 1943 break; 1944 case CH_EVT_RCVD_PN: 1945 rfcomm_channel_accept_pn(channel, event_pn); 1946 log_info("-> Inform app"); 1947 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 1948 channel->state = RFCOMM_CHANNEL_INCOMING_SETUP; 1949 rfcomm_emit_connection_request(channel); 1950 break; 1951 default: 1952 break; 1953 } 1954 break; 1955 1956 case RFCOMM_CHANNEL_INCOMING_SETUP: 1957 switch (event->type){ 1958 case CH_EVT_RCVD_SABM: 1959 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM); 1960 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 1961 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 1962 } 1963 break; 1964 case CH_EVT_RCVD_PN: 1965 rfcomm_channel_accept_pn(channel, event_pn); 1966 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_PN); 1967 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED) { 1968 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 1969 } 1970 break; 1971 case CH_EVT_READY_TO_SEND: 1972 // if / else if is used to check for state transition after sending 1973 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP){ 1974 log_info("Sending UIH Parameter Negotiation Respond for #%u", channel->dlci); 1975 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 1976 rfcomm_send_uih_pn_response(multiplexer, channel->dlci, channel->pn_priority, channel->max_frame_size); 1977 } else if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_UA){ 1978 log_info("Sending UA #%u", channel->dlci); 1979 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 1980 rfcomm_send_ua(multiplexer, channel->dlci); 1981 } 1982 if (rfcomm_channel_ready_for_incoming_dlc_setup(channel)){ 1983 log_info("Incomping setup done, requesting send MSC CMD and send Credits"); 1984 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 1985 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 1986 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 1987 } 1988 break; 1989 default: 1990 break; 1991 } 1992 break; 1993 1994 case RFCOMM_CHANNEL_W4_MULTIPLEXER: 1995 switch (event->type) { 1996 case CH_EVT_MULTIPLEXER_READY: 1997 log_info("Muliplexer opened, sending UIH PN next"); 1998 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 1999 break; 2000 default: 2001 break; 2002 } 2003 break; 2004 2005 case RFCOMM_CHANNEL_SEND_UIH_PN: 2006 switch (event->type) { 2007 case CH_EVT_READY_TO_SEND: 2008 // update mtu 2009 channel->max_frame_size = btstack_min(multiplexer->max_frame_size, channel->max_frame_size); 2010 log_info("Sending UIH Parameter Negotiation Command for #%u (channel 0x%p) mtu %u", channel->dlci, channel, channel->max_frame_size ); 2011 channel->state = RFCOMM_CHANNEL_W4_PN_RSP; 2012 rfcomm_send_uih_pn_command(multiplexer, channel->dlci, channel->max_frame_size); 2013 break; 2014 default: 2015 break; 2016 } 2017 break; 2018 2019 case RFCOMM_CHANNEL_W4_PN_RSP: 2020 switch (event->type){ 2021 case CH_EVT_RCVD_PN_RSP: 2022 // update max frame size 2023 if (channel->max_frame_size > event_pn->max_frame_size) { 2024 channel->max_frame_size = event_pn->max_frame_size; 2025 } 2026 // new credits 2027 channel->credits_outgoing = event_pn->credits_outgoing; 2028 channel->state = RFCOMM_CHANNEL_SEND_SABM_W4_UA; 2029 break; 2030 default: 2031 break; 2032 } 2033 break; 2034 2035 case RFCOMM_CHANNEL_SEND_SABM_W4_UA: 2036 switch (event->type) { 2037 case CH_EVT_READY_TO_SEND: 2038 log_info("Sending SABM #%u", channel->dlci); 2039 channel->state = RFCOMM_CHANNEL_W4_UA; 2040 rfcomm_send_sabm(multiplexer, channel->dlci); 2041 break; 2042 default: 2043 break; 2044 } 2045 break; 2046 2047 case RFCOMM_CHANNEL_W4_UA: 2048 switch (event->type){ 2049 case CH_EVT_RCVD_UA: 2050 channel->state = RFCOMM_CHANNEL_DLC_SETUP; 2051 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2052 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2053 break; 2054 default: 2055 break; 2056 } 2057 break; 2058 2059 case RFCOMM_CHANNEL_DLC_SETUP: 2060 switch (event->type){ 2061 case CH_EVT_RCVD_MSC_CMD: 2062 channel->remote_modem_status = ((rfcomm_channel_event_msc_t*) event)->modem_status; 2063 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_CMD); 2064 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2065 break; 2066 case CH_EVT_RCVD_MSC_RSP: 2067 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP); 2068 break; 2069 2070 case CH_EVT_READY_TO_SEND: 2071 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS){ 2072 log_info("Providing credits for #%u", channel->dlci); 2073 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS); 2074 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS); 2075 if (channel->new_credits_incoming) { 2076 uint8_t new_credits = channel->new_credits_incoming; 2077 channel->new_credits_incoming = 0; 2078 rfcomm_channel_send_credits(channel, new_credits); 2079 } 2080 break; 2081 } 2082 break; 2083 default: 2084 break; 2085 } 2086 // finally done? 2087 if (rfcomm_channel_ready_for_open(channel)){ 2088 channel->state = RFCOMM_CHANNEL_OPEN; 2089 rfcomm_channel_opened(channel); 2090 } 2091 break; 2092 2093 case RFCOMM_CHANNEL_OPEN: 2094 switch (event->type){ 2095 case CH_EVT_RCVD_MSC_CMD: 2096 channel->remote_modem_status = ((rfcomm_channel_event_msc_t*) event)->modem_status; 2097 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP); 2098 break; 2099 case CH_EVT_RCVD_RPN_RSP: 2100 if ((channel->state_var & RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE) == 0) break; 2101 rfcomm_channel_state_remove(channel, RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE); 2102 memcpy(&channel->remote_rpn_data, &((rfcomm_channel_event_rpn_t*) event)->data, sizeof(rfcomm_rpn_data_t)); 2103 rfcomm_emit_port_configuration(channel, true); 2104 break; 2105 case CH_EVT_READY_TO_SEND: 2106 if (channel->new_credits_incoming) { 2107 uint8_t new_credits = channel->new_credits_incoming; 2108 channel->new_credits_incoming = 0; 2109 rfcomm_channel_send_credits(channel, new_credits); 2110 break; 2111 } 2112 break; 2113 case CH_EVT_RCVD_CREDITS: 2114 rfcomm_notify_channel_can_send(); 2115 break; 2116 default: 2117 break; 2118 } 2119 break; 2120 2121 case RFCOMM_CHANNEL_SEND_DM: 2122 switch (event->type) { 2123 case CH_EVT_READY_TO_SEND: 2124 log_info("Sending DM_PF for #%u", channel->dlci); 2125 // don't emit channel closed - channel was never open 2126 channel->state = RFCOMM_CHANNEL_CLOSED; 2127 rfcomm_send_dm_pf(multiplexer, channel->dlci); 2128 rfcomm_channel_finalize(channel); 2129 *out_channel_valid = 0; 2130 break; 2131 default: 2132 break; 2133 } 2134 break; 2135 2136 case RFCOMM_CHANNEL_SEND_DISC: 2137 switch (event->type) { 2138 case CH_EVT_READY_TO_SEND: 2139 channel->state = RFCOMM_CHANNEL_W4_UA_AFTER_DISC; 2140 rfcomm_send_disc(multiplexer, channel->dlci); 2141 break; 2142 default: 2143 break; 2144 } 2145 break; 2146 2147 case RFCOMM_CHANNEL_W4_UA_AFTER_DISC: 2148 switch (event->type){ 2149 case CH_EVT_RCVD_UA: 2150 channel->state = RFCOMM_CHANNEL_CLOSED; 2151 rfcomm_emit_channel_closed(channel); 2152 rfcomm_channel_finalize(channel); 2153 // RFCOMM v1.2, 5.2.2. Close-Down Procedure 2154 // The device closing the last connection (DLC) on a particular session shall close the 2155 // multiplexer by closing the corresponding L2CAP channel. 2156 if (rfcomm_multiplexer_has_channels(multiplexer) == false){ 2157 log_info("Closed last DLC, shut-down multiplexer"); 2158 uint16_t l2cap_cid = multiplexer->l2cap_cid; 2159 rfcomm_multiplexer_finalize(multiplexer); 2160 l2cap_disconnect(l2cap_cid); 2161 } 2162 *out_channel_valid = 0; 2163 break; 2164 default: 2165 break; 2166 } 2167 break; 2168 2169 case RFCOMM_CHANNEL_SEND_UA_AFTER_DISC: 2170 switch (event->type) { 2171 case CH_EVT_READY_TO_SEND: 2172 log_info("Sending UA after DISC for #%u", channel->dlci); 2173 channel->state = RFCOMM_CHANNEL_CLOSED; 2174 rfcomm_send_ua(multiplexer, channel->dlci); 2175 rfcomm_channel_finalize(channel); 2176 *out_channel_valid = 0; 2177 break; 2178 default: 2179 break; 2180 } 2181 break; 2182 2183 default: 2184 break; 2185 } 2186 } 2187 2188 // MARK: RFCOMM BTstack API 2189 2190 void rfcomm_init(void){ 2191 rfcomm_security_level = gap_get_security_level(); 2192 #ifdef RFCOMM_USE_ERTM 2193 rfcomm_ertm_id = 0; 2194 #endif 2195 } 2196 2197 void rfcomm_deinit(void){ 2198 rfcomm_client_cid_generator = 0; 2199 rfcomm_multiplexers = NULL; 2200 rfcomm_services = NULL; 2201 rfcomm_channels = NULL; 2202 #ifdef RFCOMM_USE_ERTM 2203 rfcomm_ertm_request_callback = NULL; 2204 rfcomm_ertm_released_callback = NULL; 2205 #endif 2206 } 2207 2208 void rfcomm_set_required_security_level(gap_security_level_t security_level){ 2209 rfcomm_security_level = security_level; 2210 } 2211 2212 bool rfcomm_can_send_packet_now(uint16_t rfcomm_cid){ 2213 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2214 if (!channel){ 2215 log_error("send cid 0x%02x doesn't exist!", rfcomm_cid); 2216 return false; 2217 } 2218 return rfcomm_channel_can_send(channel); 2219 } 2220 2221 uint8_t rfcomm_request_can_send_now_event(uint16_t rfcomm_cid){ 2222 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2223 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2224 channel->waiting_for_can_send_now = 1; 2225 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2226 return ERROR_CODE_SUCCESS; 2227 } 2228 2229 static uint8_t rfcomm_assert_send_valid(rfcomm_channel_t * channel , uint16_t len){ 2230 if (len > channel->max_frame_size){ 2231 log_error("send cid 0x%02x, rfcomm data lenght exceeds MTU!", channel->rfcomm_cid); 2232 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2233 } 2234 2235 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2236 if (len > rfcomm_max_frame_size_for_l2cap_mtu(sizeof(outgoing_buffer))){ 2237 log_error("send cid 0x%02x, length exceeds outgoing rfcomm_out_buffer", channel->rfcomm_cid); 2238 return RFCOMM_DATA_LEN_EXCEEDS_MTU; 2239 } 2240 #endif 2241 2242 if (!channel->credits_outgoing){ 2243 log_info("send cid 0x%02x, no rfcomm outgoing credits!", channel->rfcomm_cid); 2244 return RFCOMM_NO_OUTGOING_CREDITS; 2245 } 2246 2247 if ((channel->multiplexer->fcon & 1) == 0){ 2248 log_info("send cid 0x%02x, aggregate flow off!", channel->rfcomm_cid); 2249 return RFCOMM_AGGREGATE_FLOW_OFF; 2250 } 2251 return ERROR_CODE_SUCCESS; 2252 } 2253 2254 uint16_t rfcomm_get_max_frame_size(uint16_t rfcomm_cid){ 2255 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2256 if (!channel){ 2257 return 0; 2258 } 2259 return channel->max_frame_size; 2260 } 2261 2262 // pre: rfcomm_can_send_packet_now(rfcomm_cid) == true 2263 void rfcomm_reserve_packet_buffer(void){ 2264 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2265 log_error("rfcomm_reserve_packet_buffer should not get called with ERTM"); 2266 #else 2267 l2cap_reserve_packet_buffer(); 2268 #endif 2269 } 2270 2271 void rfcomm_release_packet_buffer(void){ 2272 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2273 log_error("rfcomm_release_packet_buffer should not get called with ERTM"); 2274 #else 2275 l2cap_release_packet_buffer(); 2276 #endif 2277 } 2278 2279 uint8_t * rfcomm_get_outgoing_buffer(void){ 2280 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2281 uint8_t * rfcomm_out_buffer = outgoing_buffer; 2282 #else 2283 uint8_t * rfcomm_out_buffer = l2cap_get_outgoing_buffer(); 2284 #endif 2285 // address + control + length (16) + no credit field 2286 return &rfcomm_out_buffer[4]; 2287 } 2288 2289 uint8_t rfcomm_send_prepared(uint16_t rfcomm_cid, uint16_t len){ 2290 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2291 if (!channel){ 2292 log_error("cid 0x%02x doesn't exist!", rfcomm_cid); 2293 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2294 } 2295 2296 uint8_t status = rfcomm_assert_send_valid(channel, len); 2297 if (status != ERROR_CODE_SUCCESS) return status; 2298 2299 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2300 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2301 log_error("l2cap cannot send now"); 2302 return BTSTACK_ACL_BUFFERS_FULL; 2303 } 2304 #else 2305 if (!l2cap_can_send_prepared_packet_now(channel->multiplexer->l2cap_cid)){ 2306 log_error("l2cap cannot send now"); 2307 return BTSTACK_ACL_BUFFERS_FULL; 2308 } 2309 #endif 2310 2311 // send might cause l2cap to emit new credits, update counters first 2312 if (len){ 2313 channel->credits_outgoing--; 2314 } else { 2315 log_info("sending empty RFCOMM packet for cid %02x", rfcomm_cid); 2316 } 2317 2318 status = rfcomm_send_uih_prepared(channel->multiplexer, channel->dlci, len); 2319 2320 if (status != 0) { 2321 log_error("error %d", status); 2322 if (len) { 2323 channel->credits_outgoing++; 2324 } 2325 } 2326 2327 return status; 2328 } 2329 2330 uint8_t rfcomm_send(uint16_t rfcomm_cid, uint8_t *data, 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 if (!l2cap_can_send_packet_now(channel->multiplexer->l2cap_cid)){ 2340 log_error("rfcomm_send_internal: l2cap cannot send now"); 2341 return BTSTACK_ACL_BUFFERS_FULL; 2342 } 2343 2344 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2345 #else 2346 rfcomm_reserve_packet_buffer(); 2347 #endif 2348 uint8_t * rfcomm_payload = rfcomm_get_outgoing_buffer(); 2349 2350 (void)memcpy(rfcomm_payload, data, len); 2351 status = rfcomm_send_prepared(rfcomm_cid, len); 2352 2353 #ifdef RFCOMM_USE_OUTGOING_BUFFER 2354 #else 2355 if (status != ERROR_CODE_SUCCESS){ 2356 rfcomm_release_packet_buffer(); 2357 } 2358 #endif 2359 2360 return ERROR_CODE_SUCCESS; 2361 } 2362 2363 // Sends Local Line Status, see LINE_STATUS_.. 2364 uint8_t rfcomm_send_local_line_status(uint16_t rfcomm_cid, uint8_t line_status){ 2365 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2366 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2367 if (channel->local_line_status != RFCOMM_RLS_STATUS_INVALID) return ERROR_CODE_COMMAND_DISALLOWED; 2368 channel->local_line_status = line_status; 2369 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2370 return ERROR_CODE_SUCCESS; 2371 } 2372 2373 // Sned local modem status. see MODEM_STAUS_.. 2374 uint8_t rfcomm_send_modem_status(uint16_t rfcomm_cid, uint8_t modem_status){ 2375 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2376 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2377 channel->local_modem_status = modem_status; 2378 // trigger send 2379 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD); 2380 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2381 return ERROR_CODE_SUCCESS; 2382 } 2383 2384 // Configure remote port 2385 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){ 2386 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2387 if (!channel){ 2388 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2389 } 2390 2391 // store remote config 2392 channel->remote_rpn_data.baud_rate = baud_rate; 2393 channel->remote_rpn_data.flags = data_bits | (stop_bits << 2) | (parity << 3); 2394 channel->remote_rpn_data.flow_control = flow_control; 2395 channel->remote_rpn_data.xon = 0; 2396 channel->remote_rpn_data.xoff = 0; 2397 channel->remote_rpn_data.parameter_mask_0 = 0x1f; // all but xon/xoff 2398 channel->remote_rpn_data.parameter_mask_1 = 0x3f; // all flow control options 2399 2400 // trigger send 2401 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_CONFIG); 2402 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2403 return ERROR_CODE_SUCCESS; 2404 } 2405 2406 // Query remote port 2407 uint8_t rfcomm_query_port_configuration(uint16_t rfcomm_cid){ 2408 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2409 if (!channel){ 2410 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2411 } 2412 // trigger send 2413 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_QUERY | RFCOMM_CHANNEL_STATE_VAR_EMIT_RPN_RESPONSE); 2414 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2415 return ERROR_CODE_SUCCESS; 2416 } 2417 2418 2419 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){ 2420 log_info("create addr %s channel #%u init credits %u", bd_addr_to_str(addr), server_channel, initial_credits); 2421 2422 // create new multiplexer if necessary 2423 uint8_t status = 0; 2424 uint8_t dlci = 0; 2425 int new_multiplexer = 0; 2426 rfcomm_channel_t * channel = NULL; 2427 rfcomm_multiplexer_t * multiplexer = rfcomm_multiplexer_for_addr(addr); 2428 if (!multiplexer) { 2429 multiplexer = rfcomm_multiplexer_create_for_addr(addr); 2430 if (!multiplexer) return BTSTACK_MEMORY_ALLOC_FAILED; 2431 2432 multiplexer->outgoing = 1; 2433 multiplexer->state = RFCOMM_MULTIPLEXER_W4_CONNECT; 2434 new_multiplexer = 1; 2435 } 2436 2437 // check if channel for this remote service already exists 2438 dlci = (server_channel << 1) | (multiplexer->outgoing ^ 1); 2439 channel = rfcomm_channel_for_multiplexer_and_dlci(multiplexer, dlci); 2440 if (channel){ 2441 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2442 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2443 } 2444 2445 // prepare channel 2446 channel = rfcomm_channel_create(multiplexer, NULL, server_channel); 2447 if (!channel){ 2448 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2449 return BTSTACK_MEMORY_ALLOC_FAILED; 2450 } 2451 2452 // rfcomm_cid is already assigned by rfcomm_channel_create 2453 channel->incoming_flow_control = incoming_flow_control; 2454 channel->new_credits_incoming = initial_credits; 2455 channel->packet_handler = packet_handler; 2456 2457 // return rfcomm_cid 2458 if (out_rfcomm_cid){ 2459 *out_rfcomm_cid = channel->rfcomm_cid; 2460 } 2461 2462 // start multiplexer setup 2463 if (multiplexer->state != RFCOMM_MULTIPLEXER_OPEN) { 2464 channel->state = RFCOMM_CHANNEL_W4_MULTIPLEXER; 2465 uint16_t l2cap_cid = 0; 2466 #ifdef RFCOMM_USE_ERTM 2467 // request 2468 rfcomm_ertm_request_t request; 2469 memset(&request, 0, sizeof(rfcomm_ertm_request_t)); 2470 (void)memcpy(request.addr, addr, 6); 2471 request.ertm_id = rfcomm_next_ertm_id(); 2472 if (rfcomm_ertm_request_callback){ 2473 (*rfcomm_ertm_request_callback)(&request); 2474 } 2475 if (request.ertm_config && request.ertm_buffer && request.ertm_buffer_size){ 2476 multiplexer->ertm_id = request.ertm_id; 2477 status = l2cap_ertm_create_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, 2478 request.ertm_config, request.ertm_buffer, request.ertm_buffer_size, &l2cap_cid); 2479 } 2480 else 2481 #endif 2482 { 2483 status = l2cap_create_channel(rfcomm_packet_handler, addr, BLUETOOTH_PROTOCOL_RFCOMM, l2cap_max_mtu(), &l2cap_cid); 2484 } 2485 if (status) { 2486 if (new_multiplexer) btstack_memory_rfcomm_multiplexer_free(multiplexer); 2487 btstack_memory_rfcomm_channel_free(channel); 2488 return status; 2489 } 2490 multiplexer->l2cap_cid = l2cap_cid; 2491 return ERROR_CODE_SUCCESS; 2492 } 2493 2494 channel->state = RFCOMM_CHANNEL_SEND_UIH_PN; 2495 2496 // start connecting, if multiplexer is already up and running 2497 l2cap_request_can_send_now_event(multiplexer->l2cap_cid); 2498 return ERROR_CODE_SUCCESS; 2499 } 2500 2501 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){ 2502 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 1, initial_credits, out_rfcomm_cid); 2503 } 2504 2505 uint8_t rfcomm_create_channel(btstack_packet_handler_t packet_handler, bd_addr_t addr, uint8_t server_channel, uint16_t * out_rfcomm_cid){ 2506 return rfcomm_channel_create_internal(packet_handler, addr, server_channel, 0, RFCOMM_CREDITS, out_rfcomm_cid); 2507 } 2508 2509 uint8_t rfcomm_disconnect(uint16_t rfcomm_cid){ 2510 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2511 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2512 2513 if (channel->state != RFCOMM_CHANNEL_OPEN) return ERROR_CODE_COMMAND_DISALLOWED; 2514 2515 log_info("disconnect cid 0x%02x", rfcomm_cid); 2516 channel->state = RFCOMM_CHANNEL_SEND_DISC; 2517 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2518 return ERROR_CODE_SUCCESS; 2519 } 2520 2521 static uint8_t rfcomm_register_service_internal(btstack_packet_handler_t packet_handler, 2522 uint8_t channel, uint16_t max_frame_size, uint8_t incoming_flow_control, uint8_t initial_credits){ 2523 2524 log_info("register channel #%u mtu %u flow_control %u credits %u", 2525 channel, max_frame_size, incoming_flow_control, initial_credits); 2526 2527 // check if already registered 2528 rfcomm_service_t * service = rfcomm_service_for_channel(channel); 2529 if (service){ 2530 return RFCOMM_CHANNEL_ALREADY_REGISTERED; 2531 } 2532 2533 // alloc structure 2534 service = btstack_memory_rfcomm_service_get(); 2535 if (!service) { 2536 return BTSTACK_MEMORY_ALLOC_FAILED; 2537 } 2538 2539 // register with l2cap if not registered before, max MTU 2540 if (btstack_linked_list_empty(&rfcomm_services)){ 2541 uint8_t status = l2cap_register_service(rfcomm_packet_handler, BLUETOOTH_PROTOCOL_RFCOMM, 0xffff, rfcomm_security_level); 2542 if (status != ERROR_CODE_SUCCESS){ 2543 btstack_memory_rfcomm_service_free(service); 2544 return status; 2545 } 2546 } 2547 2548 // fill in 2549 service->packet_handler = packet_handler; 2550 service->server_channel = channel; 2551 service->max_frame_size = max_frame_size; 2552 service->incoming_flow_control = incoming_flow_control; 2553 service->incoming_initial_credits = initial_credits; 2554 2555 // add to services list 2556 btstack_linked_list_add(&rfcomm_services, (btstack_linked_item_t *) service); 2557 2558 return ERROR_CODE_SUCCESS; 2559 } 2560 2561 uint8_t rfcomm_register_service_with_initial_credits(btstack_packet_handler_t packet_handler, 2562 uint8_t channel, uint16_t max_frame_size, uint8_t initial_credits){ 2563 2564 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 1, initial_credits); 2565 } 2566 2567 uint8_t rfcomm_register_service(btstack_packet_handler_t packet_handler, uint8_t channel, 2568 uint16_t max_frame_size){ 2569 2570 return rfcomm_register_service_internal(packet_handler, channel, max_frame_size, 0,RFCOMM_CREDITS); 2571 } 2572 2573 void rfcomm_unregister_service(uint8_t service_channel){ 2574 rfcomm_service_t *service = rfcomm_service_for_channel(service_channel); 2575 if (!service) return; 2576 btstack_linked_list_remove(&rfcomm_services, (btstack_linked_item_t *) service); 2577 btstack_memory_rfcomm_service_free(service); 2578 2579 // unregister if no services active 2580 if (btstack_linked_list_empty(&rfcomm_services)){ 2581 // bt_send_cmd(&l2cap_unregister_service, BLUETOOTH_PROTOCOL_RFCOMM); 2582 l2cap_unregister_service(BLUETOOTH_PROTOCOL_RFCOMM); 2583 } 2584 } 2585 2586 uint8_t rfcomm_accept_connection(uint16_t rfcomm_cid){ 2587 log_info("accept cid 0x%02x", rfcomm_cid); 2588 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2589 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2590 2591 switch (channel->state) { 2592 case RFCOMM_CHANNEL_INCOMING_SETUP: 2593 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED); 2594 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_PN){ 2595 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP); 2596 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2597 } 2598 if (channel->state_var & RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM){ 2599 rfcomm_channel_state_add(channel, RFCOMM_CHANNEL_STATE_VAR_SEND_UA); 2600 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2601 } 2602 // at least one of { PN RSP, UA } needs to be sent 2603 // state transistion incoming setup -> dlc setup happens in rfcomm_run after these have been sent 2604 return ERROR_CODE_SUCCESS; 2605 default: 2606 return ERROR_CODE_COMMAND_DISALLOWED; 2607 } 2608 } 2609 2610 uint8_t rfcomm_decline_connection(uint16_t rfcomm_cid){ 2611 log_info("decline cid 0x%02x", rfcomm_cid); 2612 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2613 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2614 2615 switch (channel->state) { 2616 case RFCOMM_CHANNEL_INCOMING_SETUP: 2617 channel->state = RFCOMM_CHANNEL_SEND_DM; 2618 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2619 return ERROR_CODE_SUCCESS; 2620 default: 2621 return ERROR_CODE_COMMAND_DISALLOWED; 2622 } 2623 } 2624 2625 uint8_t rfcomm_grant_credits(uint16_t rfcomm_cid, uint8_t credits){ 2626 log_info("grant cid 0x%02x credits %u", rfcomm_cid, credits); 2627 rfcomm_channel_t * channel = rfcomm_channel_for_rfcomm_cid(rfcomm_cid); 2628 if (!channel) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2629 if (!channel->incoming_flow_control) return ERROR_CODE_COMMAND_DISALLOWED; 2630 channel->new_credits_incoming += credits; 2631 2632 // process 2633 l2cap_request_can_send_now_event(channel->multiplexer->l2cap_cid); 2634 return ERROR_CODE_SUCCESS; 2635 } 2636 2637 #ifdef RFCOMM_USE_ERTM 2638 void rfcomm_enable_l2cap_ertm(void request_callback(rfcomm_ertm_request_t * request), void released_callback(uint16_t ertm_id)){ 2639 rfcomm_ertm_request_callback = request_callback; 2640 rfcomm_ertm_released_callback = released_callback; 2641 } 2642 #endif 2643