1 /* $NetBSD: rfcomm_upper.c,v 1.8 2007/11/03 17:20:17 plunky Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Itronix Inc. 5 * All rights reserved. 6 * 7 * Written by Iain Hibbert for Itronix Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of Itronix Inc. may not be used to endorse 18 * or promote products derived from this software without specific 19 * prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 28 * ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: rfcomm_upper.c,v 1.8 2007/11/03 17:20:17 plunky Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/mbuf.h> 40 #include <sys/proc.h> 41 #include <sys/systm.h> 42 43 #include <netbt/bluetooth.h> 44 #include <netbt/hci.h> 45 #include <netbt/l2cap.h> 46 #include <netbt/rfcomm.h> 47 48 /**************************************************************************** 49 * 50 * RFCOMM DLC - Upper Protocol API 51 * 52 * Currently the only 'Port Emulation Entity' is the RFCOMM socket code 53 * but it is should be possible to provide a pseudo-device for a direct 54 * tty interface. 55 */ 56 57 /* 58 * rfcomm_attach(handle, proto, upper) 59 * 60 * attach a new RFCOMM DLC to handle, populate with reasonable defaults 61 */ 62 int 63 rfcomm_attach(struct rfcomm_dlc **handle, 64 const struct btproto *proto, void *upper) 65 { 66 struct rfcomm_dlc *dlc; 67 68 KASSERT(handle != NULL); 69 KASSERT(proto != NULL); 70 KASSERT(upper != NULL); 71 72 dlc = malloc(sizeof(struct rfcomm_dlc), M_BLUETOOTH, M_NOWAIT | M_ZERO); 73 if (dlc == NULL) 74 return ENOMEM; 75 76 dlc->rd_state = RFCOMM_DLC_CLOSED; 77 dlc->rd_mtu = rfcomm_mtu_default; 78 79 dlc->rd_proto = proto; 80 dlc->rd_upper = upper; 81 82 dlc->rd_laddr.bt_len = sizeof(struct sockaddr_bt); 83 dlc->rd_laddr.bt_family = AF_BLUETOOTH; 84 dlc->rd_laddr.bt_psm = L2CAP_PSM_RFCOMM; 85 86 dlc->rd_raddr.bt_len = sizeof(struct sockaddr_bt); 87 dlc->rd_raddr.bt_family = AF_BLUETOOTH; 88 dlc->rd_raddr.bt_psm = L2CAP_PSM_RFCOMM; 89 90 dlc->rd_lmodem = RFCOMM_MSC_RTC | RFCOMM_MSC_RTR | RFCOMM_MSC_DV; 91 92 callout_init(&dlc->rd_timeout, 0); 93 callout_setfunc(&dlc->rd_timeout, rfcomm_dlc_timeout, dlc); 94 95 *handle = dlc; 96 return 0; 97 } 98 99 /* 100 * rfcomm_bind(dlc, sockaddr) 101 * 102 * bind DLC to local address 103 */ 104 int 105 rfcomm_bind(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr) 106 { 107 108 memcpy(&dlc->rd_laddr, addr, sizeof(struct sockaddr_bt)); 109 return 0; 110 } 111 112 /* 113 * rfcomm_sockaddr(dlc, sockaddr) 114 * 115 * return local address 116 */ 117 int 118 rfcomm_sockaddr(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr) 119 { 120 121 memcpy(addr, &dlc->rd_laddr, sizeof(struct sockaddr_bt)); 122 return 0; 123 } 124 125 /* 126 * rfcomm_connect(dlc, sockaddr) 127 * 128 * Initiate connection of RFCOMM DLC to remote address. 129 */ 130 int 131 rfcomm_connect(struct rfcomm_dlc *dlc, struct sockaddr_bt *dest) 132 { 133 struct rfcomm_session *rs; 134 int err = 0; 135 136 if (dlc->rd_state != RFCOMM_DLC_CLOSED) 137 return EISCONN; 138 139 memcpy(&dlc->rd_raddr, dest, sizeof(struct sockaddr_bt)); 140 141 if (dlc->rd_raddr.bt_channel < RFCOMM_CHANNEL_MIN 142 || dlc->rd_raddr.bt_channel > RFCOMM_CHANNEL_MAX 143 || bdaddr_any(&dlc->rd_raddr.bt_bdaddr)) 144 return EDESTADDRREQ; 145 146 if (dlc->rd_raddr.bt_psm == L2CAP_PSM_ANY) 147 dlc->rd_raddr.bt_psm = L2CAP_PSM_RFCOMM; 148 else if (dlc->rd_raddr.bt_psm != L2CAP_PSM_RFCOMM 149 && (dlc->rd_raddr.bt_psm < 0x1001 150 || L2CAP_PSM_INVALID(dlc->rd_raddr.bt_psm))) 151 return EINVAL; 152 153 /* 154 * We are allowed only one RFCOMM session between any 2 Bluetooth 155 * devices, so see if there is a session already otherwise create 156 * one and set it connecting. 157 */ 158 rs = rfcomm_session_lookup(&dlc->rd_laddr, &dlc->rd_raddr); 159 if (rs == NULL) { 160 rs = rfcomm_session_alloc(&rfcomm_session_active, 161 &dlc->rd_laddr); 162 if (rs == NULL) 163 return ENOMEM; 164 165 rs->rs_flags |= RFCOMM_SESSION_INITIATOR; 166 rs->rs_state = RFCOMM_SESSION_WAIT_CONNECT; 167 168 err = l2cap_connect(rs->rs_l2cap, &dlc->rd_raddr); 169 if (err) { 170 rfcomm_session_free(rs); 171 return err; 172 } 173 174 /* 175 * This session will start up automatically when its 176 * L2CAP channel is connected. 177 */ 178 } 179 180 /* construct DLC */ 181 dlc->rd_dlci = RFCOMM_MKDLCI(IS_INITIATOR(rs) ? 0:1, dest->bt_channel); 182 if (rfcomm_dlc_lookup(rs, dlc->rd_dlci)) 183 return EBUSY; 184 185 l2cap_sockaddr(rs->rs_l2cap, &dlc->rd_laddr); 186 187 /* 188 * attach the DLC to the session and start it off 189 */ 190 dlc->rd_session = rs; 191 dlc->rd_state = RFCOMM_DLC_WAIT_SESSION; 192 LIST_INSERT_HEAD(&rs->rs_dlcs, dlc, rd_next); 193 194 if (rs->rs_state == RFCOMM_SESSION_OPEN) 195 err = rfcomm_dlc_connect(dlc); 196 197 return err; 198 } 199 200 /* 201 * rfcomm_peeraddr(dlc, sockaddr) 202 * 203 * return remote address 204 */ 205 int 206 rfcomm_peeraddr(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr) 207 { 208 209 memcpy(addr, &dlc->rd_raddr, sizeof(struct sockaddr_bt)); 210 return 0; 211 } 212 213 /* 214 * rfcomm_disconnect(dlc, linger) 215 * 216 * disconnect RFCOMM DLC 217 */ 218 int 219 rfcomm_disconnect(struct rfcomm_dlc *dlc, int linger) 220 { 221 struct rfcomm_session *rs = dlc->rd_session; 222 int err = 0; 223 224 KASSERT(dlc != NULL); 225 226 switch (dlc->rd_state) { 227 case RFCOMM_DLC_CLOSED: 228 case RFCOMM_DLC_LISTEN: 229 return EINVAL; 230 231 case RFCOMM_DLC_WAIT_SEND_UA: 232 err = rfcomm_session_send_frame(rs, 233 RFCOMM_FRAME_DM, dlc->rd_dlci); 234 235 /* fall through */ 236 case RFCOMM_DLC_WAIT_SESSION: 237 case RFCOMM_DLC_WAIT_CONNECT: 238 case RFCOMM_DLC_WAIT_SEND_SABM: 239 rfcomm_dlc_close(dlc, 0); 240 break; 241 242 case RFCOMM_DLC_OPEN: 243 if (dlc->rd_txbuf != NULL && linger != 0) { 244 dlc->rd_flags |= RFCOMM_DLC_SHUTDOWN; 245 break; 246 } 247 248 /* else fall through */ 249 case RFCOMM_DLC_WAIT_RECV_UA: 250 dlc->rd_state = RFCOMM_DLC_WAIT_DISCONNECT; 251 err = rfcomm_session_send_frame(rs, RFCOMM_FRAME_DISC, 252 dlc->rd_dlci); 253 callout_schedule(&dlc->rd_timeout, rfcomm_ack_timeout * hz); 254 break; 255 256 case RFCOMM_DLC_WAIT_DISCONNECT: 257 err = EALREADY; 258 break; 259 260 default: 261 UNKNOWN(dlc->rd_state); 262 break; 263 } 264 265 return err; 266 } 267 268 /* 269 * rfcomm_detach(handle) 270 * 271 * detach RFCOMM DLC from handle 272 */ 273 int 274 rfcomm_detach(struct rfcomm_dlc **handle) 275 { 276 struct rfcomm_dlc *dlc = *handle; 277 278 if (dlc->rd_state != RFCOMM_DLC_CLOSED) 279 rfcomm_dlc_close(dlc, 0); 280 281 if (dlc->rd_txbuf != NULL) { 282 m_freem(dlc->rd_txbuf); 283 dlc->rd_txbuf = NULL; 284 } 285 286 dlc->rd_upper = NULL; 287 *handle = NULL; 288 289 /* 290 * If callout is invoking we can't free the DLC so 291 * mark it and let the callout release it. 292 */ 293 if (callout_invoking(&dlc->rd_timeout)) 294 dlc->rd_flags |= RFCOMM_DLC_DETACH; 295 else { 296 callout_destroy(&dlc->rd_timeout); 297 free(dlc, M_BLUETOOTH); 298 } 299 300 return 0; 301 } 302 303 /* 304 * rfcomm_listen(dlc) 305 * 306 * This DLC is a listener. We look for an existing listening session 307 * with a matching address to attach to or else create a new one on 308 * the listeners list. 309 */ 310 int 311 rfcomm_listen(struct rfcomm_dlc *dlc) 312 { 313 struct rfcomm_session *rs, *any, *best; 314 struct sockaddr_bt addr; 315 int err; 316 317 if (dlc->rd_state != RFCOMM_DLC_CLOSED) 318 return EISCONN; 319 320 if (dlc->rd_laddr.bt_channel < RFCOMM_CHANNEL_MIN 321 || dlc->rd_laddr.bt_channel > RFCOMM_CHANNEL_MAX) 322 return EADDRNOTAVAIL; 323 324 if (dlc->rd_laddr.bt_psm == L2CAP_PSM_ANY) 325 dlc->rd_laddr.bt_psm = L2CAP_PSM_RFCOMM; 326 else if (dlc->rd_laddr.bt_psm != L2CAP_PSM_RFCOMM 327 && (dlc->rd_laddr.bt_psm < 0x1001 328 || L2CAP_PSM_INVALID(dlc->rd_laddr.bt_psm))) 329 return EADDRNOTAVAIL; 330 331 any = best = NULL; 332 LIST_FOREACH(rs, &rfcomm_session_listen, rs_next) { 333 l2cap_sockaddr(rs->rs_l2cap, &addr); 334 335 if (addr.bt_psm != dlc->rd_laddr.bt_psm) 336 continue; 337 338 if (bdaddr_same(&dlc->rd_laddr.bt_bdaddr, &addr.bt_bdaddr)) 339 best = rs; 340 341 if (bdaddr_any(&addr.bt_bdaddr)) 342 any = rs; 343 } 344 345 rs = best ? best : any; 346 if (rs == NULL) { 347 rs = rfcomm_session_alloc(&rfcomm_session_listen, 348 &dlc->rd_laddr); 349 if (rs == NULL) 350 return ENOMEM; 351 352 rs->rs_state = RFCOMM_SESSION_LISTEN; 353 354 err = l2cap_listen(rs->rs_l2cap); 355 if (err) { 356 rfcomm_session_free(rs); 357 return err; 358 } 359 } 360 361 dlc->rd_session = rs; 362 dlc->rd_state = RFCOMM_DLC_LISTEN; 363 LIST_INSERT_HEAD(&rs->rs_dlcs, dlc, rd_next); 364 365 return 0; 366 } 367 368 /* 369 * rfcomm_send(dlc, mbuf) 370 * 371 * Output data on DLC. This is streamed data, so we add it 372 * to our buffer and start the the DLC, which will assemble 373 * packets and send them if it can. 374 */ 375 int 376 rfcomm_send(struct rfcomm_dlc *dlc, struct mbuf *m) 377 { 378 379 if (dlc->rd_txbuf != NULL) { 380 dlc->rd_txbuf->m_pkthdr.len += m->m_pkthdr.len; 381 m_cat(dlc->rd_txbuf, m); 382 } else { 383 dlc->rd_txbuf = m; 384 } 385 386 if (dlc->rd_state == RFCOMM_DLC_OPEN) 387 rfcomm_dlc_start(dlc); 388 389 return 0; 390 } 391 392 /* 393 * rfcomm_rcvd(dlc, space) 394 * 395 * Indicate space now available in receive buffer 396 * 397 * This should be used to give an initial value of the receive buffer 398 * size when the DLC is attached and anytime data is cleared from the 399 * buffer after that. 400 */ 401 int 402 rfcomm_rcvd(struct rfcomm_dlc *dlc, size_t space) 403 { 404 405 KASSERT(dlc != NULL); 406 407 dlc->rd_rxsize = space; 408 409 /* 410 * if we are using credit based flow control, we may 411 * want to send some credits.. 412 */ 413 if (dlc->rd_state == RFCOMM_DLC_OPEN 414 && (dlc->rd_session->rs_flags & RFCOMM_SESSION_CFC)) 415 rfcomm_dlc_start(dlc); 416 417 return 0; 418 } 419 420 /* 421 * rfcomm_setopt(dlc, option, addr) 422 * 423 * set DLC options 424 */ 425 int 426 rfcomm_setopt(struct rfcomm_dlc *dlc, int opt, void *addr) 427 { 428 int mode, err = 0; 429 uint16_t mtu; 430 431 switch (opt) { 432 case SO_RFCOMM_MTU: 433 mtu = *(uint16_t *)addr; 434 if (mtu < RFCOMM_MTU_MIN || mtu > RFCOMM_MTU_MAX) 435 err = EINVAL; 436 else if (dlc->rd_state == RFCOMM_DLC_CLOSED) 437 dlc->rd_mtu = mtu; 438 else 439 err = EBUSY; 440 441 break; 442 443 case SO_RFCOMM_LM: 444 mode = *(int *)addr; 445 mode &= (RFCOMM_LM_SECURE | RFCOMM_LM_ENCRYPT | RFCOMM_LM_AUTH); 446 447 if (mode & RFCOMM_LM_SECURE) 448 mode |= RFCOMM_LM_ENCRYPT; 449 450 if (mode & RFCOMM_LM_ENCRYPT) 451 mode |= RFCOMM_LM_AUTH; 452 453 dlc->rd_mode = mode; 454 455 if (dlc->rd_state == RFCOMM_DLC_OPEN) 456 err = rfcomm_dlc_setmode(dlc); 457 458 break; 459 460 default: 461 err = ENOPROTOOPT; 462 break; 463 } 464 return err; 465 } 466 467 /* 468 * rfcomm_getopt(dlc, option, addr) 469 * 470 * get DLC options 471 */ 472 int 473 rfcomm_getopt(struct rfcomm_dlc *dlc, int opt, void *addr) 474 { 475 struct rfcomm_fc_info *fc; 476 477 switch (opt) { 478 case SO_RFCOMM_MTU: 479 *(uint16_t *)addr = dlc->rd_mtu; 480 return sizeof(uint16_t); 481 482 case SO_RFCOMM_FC_INFO: 483 fc = addr; 484 memset(fc, 0, sizeof(*fc)); 485 fc->lmodem = dlc->rd_lmodem; 486 fc->rmodem = dlc->rd_rmodem; 487 fc->tx_cred = max(dlc->rd_txcred, 0xff); 488 fc->rx_cred = max(dlc->rd_rxcred, 0xff); 489 if (dlc->rd_session 490 && (dlc->rd_session->rs_flags & RFCOMM_SESSION_CFC)) 491 fc->cfc = 1; 492 493 return sizeof(*fc); 494 495 case SO_RFCOMM_LM: 496 *(int *)addr = dlc->rd_mode; 497 return sizeof(int); 498 499 default: 500 break; 501 } 502 503 return 0; 504 } 505