sys/netbt/rfcomm_upper.c

   1 /* $OpenBSD: rfcomm_upper.c,v 1.3 2007/10/01 16:39:30 krw Exp $ */
   2 /* $NetBSD: rfcomm_upper.c,v 1.6 2007/04/21 06:15:23 plunky Exp $ */
   3 /* $DragonFly: src/sys/netbt/rfcomm_upper.c,v 1.1 2007/12/30 20:02:56 hasso Exp $ */
   4
   5 /*-
   6  * Copyright (c) 2006 Itronix Inc.
   7  * All rights reserved.
   8  *
   9  * Written by Iain Hibbert for Itronix Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of Itronix Inc. may not be used to endorse
  20  *    or promote products derived from this software without specific
  21  *    prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
  27  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  30  * ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37
  38 #include <sys/param.h>
  39 #include <sys/kernel.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/proc.h>
  42 #include <sys/systm.h>
  43 #include <sys/socketvar.h>
  44
  45 #include <netbt/bluetooth.h>
  46 #include <netbt/hci.h>
  47 #include <netbt/l2cap.h>
  48 #include <netbt/rfcomm.h>
  49
  50 /****************************************************************************
  51  *
  52  *      RFCOMM DLC - Upper Protocol API
  53  *
  54  * Currently the only 'Port Emulation Entity' is the RFCOMM socket code
  55  * but it is should be possible to provide a pseudo-device for a direct
  56  * tty interface.
  57  */
  58
  59 /*
  60  * rfcomm_attach(handle, proto, upper)
  61  *
  62  * attach a new RFCOMM DLC to handle, populate with reasonable defaults
  63  */
  64 int
  65 rfcomm_attach(struct rfcomm_dlc **handle,
  66                 const struct btproto *proto, void *upper)
  67 {
  68         struct rfcomm_dlc *dlc;
  69
  70         KKASSERT(handle != NULL);
  71         KKASSERT(proto != NULL);
  72         KKASSERT(upper != NULL);
  73
  74         dlc = kmalloc(sizeof(*dlc), M_BLUETOOTH, M_NOWAIT | M_ZERO);
  75         if (dlc == NULL)
  76                 return ENOMEM;
  77
  78         dlc->rd_state = RFCOMM_DLC_CLOSED;
  79         dlc->rd_mtu = rfcomm_mtu_default;
  80
  81         dlc->rd_proto = proto;
  82         dlc->rd_upper = upper;
  83
  84         dlc->rd_laddr.bt_len = sizeof(struct sockaddr_bt);
  85         dlc->rd_laddr.bt_family = AF_BLUETOOTH;
  86         dlc->rd_laddr.bt_psm = L2CAP_PSM_RFCOMM;
  87
  88         dlc->rd_raddr.bt_len = sizeof(struct sockaddr_bt);
  89         dlc->rd_raddr.bt_family = AF_BLUETOOTH;
  90         dlc->rd_raddr.bt_psm = L2CAP_PSM_RFCOMM;
  91
  92         dlc->rd_lmodem = RFCOMM_MSC_RTC | RFCOMM_MSC_RTR | RFCOMM_MSC_DV;
  93
  94         callout_init(&dlc->rd_timeout);
  95
  96         *handle = dlc;
  97         return 0;
  98 }
  99
 100 /*
 101  * rfcomm_bind(dlc, sockaddr)
 102  *
 103  * bind DLC to local address
 104  */
 105 int
 106 rfcomm_bind(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr)
 107 {
 108
 109         memcpy(&dlc->rd_laddr, addr, sizeof(struct sockaddr_bt));
 110         return 0;
 111 }
 112
 113 /*
 114  * rfcomm_sockaddr(dlc, sockaddr)
 115  *
 116  * return local address
 117  */
 118 int
 119 rfcomm_sockaddr(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr)
 120 {
 121
 122         memcpy(addr, &dlc->rd_laddr, sizeof(struct sockaddr_bt));
 123         return 0;
 124 }
 125
 126 /*
 127  * rfcomm_connect(dlc, sockaddr)
 128  *
 129  * Initiate connection of RFCOMM DLC to remote address.
 130  */
 131 int
 132 rfcomm_connect(struct rfcomm_dlc *dlc, struct sockaddr_bt *dest)
 133 {
 134         struct rfcomm_session *rs;
 135         int err = 0;
 136
 137         if (dlc->rd_state != RFCOMM_DLC_CLOSED)
 138                 return EISCONN;
 139
 140         memcpy(&dlc->rd_raddr, dest, sizeof(struct sockaddr_bt));
 141
 142         if (dlc->rd_raddr.bt_channel < RFCOMM_CHANNEL_MIN
 143             || dlc->rd_raddr.bt_channel > RFCOMM_CHANNEL_MAX
 144             || bdaddr_any(&dlc->rd_raddr.bt_bdaddr))
 145                 return EDESTADDRREQ;
 146
 147         if (dlc->rd_raddr.bt_psm == L2CAP_PSM_ANY)
 148                 dlc->rd_raddr.bt_psm = L2CAP_PSM_RFCOMM;
 149         else if (dlc->rd_raddr.bt_psm != L2CAP_PSM_RFCOMM
 150             && (dlc->rd_raddr.bt_psm < 0x1001
 151             || L2CAP_PSM_INVALID(dlc->rd_raddr.bt_psm)))
 152                 return EINVAL;
 153
 154         /*
 155          * We are allowed only one RFCOMM session between any 2 Bluetooth
 156          * devices, so see if there is a session already otherwise create
 157          * one and set it connecting.
 158          */
 159         rs = rfcomm_session_lookup(&dlc->rd_laddr, &dlc->rd_raddr);
 160         if (rs == NULL) {
 161                 rs = rfcomm_session_alloc(&rfcomm_session_active,
 162                                                 &dlc->rd_laddr);
 163                 if (rs == NULL)
 164                         return ENOMEM;
 165
 166                 rs->rs_flags |= RFCOMM_SESSION_INITIATOR;
 167                 rs->rs_state = RFCOMM_SESSION_WAIT_CONNECT;
 168
 169                 err = l2cap_connect(rs->rs_l2cap, &dlc->rd_raddr);
 170                 if (err) {
 171                         rfcomm_session_free(rs);
 172                         return err;
 173                 }
 174
 175                 /*
 176                  * This session will start up automatically when its
 177                  * L2CAP channel is connected.
 178                  */
 179         }
 180
 181         /* construct DLC */
 182         dlc->rd_dlci = RFCOMM_MKDLCI(IS_INITIATOR(rs) ? 0:1, dest->bt_channel);
 183         if (rfcomm_dlc_lookup(rs, dlc->rd_dlci))
 184                 return EBUSY;
 185
 186         l2cap_sockaddr(rs->rs_l2cap, &dlc->rd_laddr);
 187
 188         /*
 189          * attach the DLC to the session and start it off
 190          */
 191         dlc->rd_session = rs;
 192         dlc->rd_state = RFCOMM_DLC_WAIT_SESSION;
 193         LIST_INSERT_HEAD(&rs->rs_dlcs, dlc, rd_next);
 194
 195         if (rs->rs_state == RFCOMM_SESSION_OPEN)
 196                 err = rfcomm_dlc_connect(dlc);
 197
 198         return err;
 199 }
 200
 201 /*
 202  * rfcomm_peeraddr(dlc, sockaddr)
 203  *
 204  * return remote address
 205  */
 206 int
 207 rfcomm_peeraddr(struct rfcomm_dlc *dlc, struct sockaddr_bt *addr)
 208 {
 209
 210         memcpy(addr, &dlc->rd_raddr, sizeof(struct sockaddr_bt));
 211         return 0;
 212 }
 213
 214 /*
 215  * rfcomm_disconnect(dlc, linger)
 216  *
 217  * disconnect RFCOMM DLC
 218  */
 219 int
 220 rfcomm_disconnect(struct rfcomm_dlc *dlc, int linger)
 221 {
 222         struct rfcomm_session *rs = dlc->rd_session;
 223         int err = 0;
 224
 225         KKASSERT(dlc != NULL);
 226
 227         switch (dlc->rd_state) {
 228         case RFCOMM_DLC_CLOSED:
 229         case RFCOMM_DLC_LISTEN:
 230                 return EINVAL;
 231
 232         case RFCOMM_DLC_WAIT_SEND_UA:
 233                 err = rfcomm_session_send_frame(rs,
 234                                 RFCOMM_FRAME_DM, dlc->rd_dlci);
 235
 236                 /* fall through */
 237         case RFCOMM_DLC_WAIT_SESSION:
 238         case RFCOMM_DLC_WAIT_CONNECT:
 239         case RFCOMM_DLC_WAIT_SEND_SABM:
 240                 rfcomm_dlc_close(dlc, 0);
 241                 break;
 242
 243         case RFCOMM_DLC_OPEN:
 244                 if (dlc->rd_txbuf != NULL && linger != 0) {
 245                         dlc->rd_flags |= RFCOMM_DLC_SHUTDOWN;
 246                         break;
 247                 }
 248
 249                 /* else fall through */
 250         case RFCOMM_DLC_WAIT_RECV_UA:
 251                 dlc->rd_state = RFCOMM_DLC_WAIT_DISCONNECT;
 252                 err = rfcomm_session_send_frame(rs, RFCOMM_FRAME_DISC,
 253                                                         dlc->rd_dlci);
 254                 callout_reset(&dlc->rd_timeout, rfcomm_ack_timeout * hz,
 255                     rfcomm_dlc_timeout, dlc);
 256                 break;
 257
 258         case RFCOMM_DLC_WAIT_DISCONNECT:
 259                 err = EALREADY;
 260                 break;
 261
 262         default:
 263                 UNKNOWN(dlc->rd_state);
 264                 break;
 265         }
 266
 267         return err;
 268 }
 269
 270 /*
 271  * rfcomm_detach(handle)
 272  *
 273  * detach RFCOMM DLC from handle
 274  */
 275 int
 276 rfcomm_detach(struct rfcomm_dlc **handle)
 277 {
 278         struct rfcomm_dlc *dlc = *handle;
 279
 280         if (dlc->rd_state != RFCOMM_DLC_CLOSED)
 281                 rfcomm_dlc_close(dlc, 0);
 282
 283         if (dlc->rd_txbuf != NULL) {
 284                 m_freem(dlc->rd_txbuf);
 285                 dlc->rd_txbuf = NULL;
 286         }
 287
 288         dlc->rd_upper = NULL;
 289         *handle = NULL;
 290
 291         /*
 292          * If callout is invoking we can't free the DLC so
 293          * mark it and let the callout release it.
 294          */
 295         if (callout_active(&dlc->rd_timeout))
 296                 dlc->rd_flags |= RFCOMM_DLC_DETACH;
 297         else
 298                 kfree(dlc, M_BLUETOOTH);
 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 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         KKASSERT(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 int
 469 rfcomm_setopt2(struct rfcomm_dlc *dlc, int opt, struct socket *so,
 470     struct sockopt *sopt)
 471 {
 472         int mode, err = 0;
 473         uint16_t mtu;
 474
 475         switch (opt) {
 476         case SO_RFCOMM_MTU:
 477                 err = sooptcopyin(sopt, &mtu, sizeof(uint16_t),
 478                     sizeof(uint16_t));
 479                 if (err) break;
 480
 481                 if (mtu < RFCOMM_MTU_MIN || mtu > RFCOMM_MTU_MAX)
 482                         err = EINVAL;
 483                 else if (dlc->rd_state == RFCOMM_DLC_CLOSED)
 484                         dlc->rd_mtu = mtu;
 485                 else
 486                         err = EBUSY;
 487
 488                 break;
 489
 490         case SO_RFCOMM_LM:
 491                 err = sooptcopyin(sopt, &mode, sizeof(int), sizeof(int));
 492                 if (err) break;
 493
 494                 mode &= (RFCOMM_LM_SECURE | RFCOMM_LM_ENCRYPT | RFCOMM_LM_AUTH);
 495
 496                 if (mode & RFCOMM_LM_SECURE)
 497                         mode |= RFCOMM_LM_ENCRYPT;
 498
 499                 if (mode & RFCOMM_LM_ENCRYPT)
 500                         mode |= RFCOMM_LM_AUTH;
 501
 502                 dlc->rd_mode = mode;
 503
 504                 if (dlc->rd_state == RFCOMM_DLC_OPEN)
 505                         err = rfcomm_dlc_setmode(dlc);
 506
 507                 break;
 508
 509         default:
 510                 err = ENOPROTOOPT;
 511                 break;
 512         }
 513         return err;
 514 }
 515
 516 /*
 517  * rfcomm_getopt(dlc, option, addr)
 518  *
 519  * get DLC options
 520  */
 521 int
 522 rfcomm_getopt(struct rfcomm_dlc *dlc, int opt, void *addr)
 523 {
 524         struct rfcomm_fc_info *fc;
 525
 526         switch (opt) {
 527         case SO_RFCOMM_MTU:
 528                 *(uint16_t *)addr = dlc->rd_mtu;
 529                 return sizeof(uint16_t);
 530
 531         case SO_RFCOMM_FC_INFO:
 532                 fc = addr;
 533                 memset(fc, 0, sizeof(*fc));
 534                 fc->lmodem = dlc->rd_lmodem;
 535                 fc->rmodem = dlc->rd_rmodem;
 536                 fc->tx_cred = max(dlc->rd_txcred, 0xff);
 537                 fc->rx_cred = max(dlc->rd_rxcred, 0xff);
 538                 if (dlc->rd_session
 539                     && (dlc->rd_session->rs_flags & RFCOMM_SESSION_CFC))
 540                         fc->cfc = 1;
 541
 542                 return sizeof(*fc);
 543
 544         case SO_RFCOMM_LM:
 545                 *(int *)addr = dlc->rd_mode;
 546                 return sizeof(int);
 547
 548         default:
 549                 break;
 550         }
 551
 552         return 0;
 553 }