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rfcomm_socket.c revision 1.33 
      1 /*	$NetBSD: rfcomm_socket.c,v 1.33 2014/08/09 05:33:01 rtr 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_socket.c,v 1.33 2014/08/09 05:33:01 rtr Exp $");
     36 
     37 /* load symbolic names */
     38 #ifdef BLUETOOTH_DEBUG
     39 #define PRUREQUESTS
     40 #define PRCOREQUESTS
     41 #endif
     42 
     43 #include <sys/param.h>
     44 #include <sys/domain.h>
     45 #include <sys/kernel.h>
     46 #include <sys/mbuf.h>
     47 #include <sys/proc.h>
     48 #include <sys/protosw.h>
     49 #include <sys/socket.h>
     50 #include <sys/socketvar.h>
     51 #include <sys/systm.h>
     52 
     53 #include <netbt/bluetooth.h>
     54 #include <netbt/rfcomm.h>
     55 
     56 /****************************************************************************
     57  *
     58  *	RFCOMM SOCK_STREAM Sockets - serial line emulation
     59  *
     60  */
     61 
     62 static void rfcomm_connecting(void *);
     63 static void rfcomm_connected(void *);
     64 static void rfcomm_disconnected(void *, int);
     65 static void *rfcomm_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
     66 static void rfcomm_complete(void *, int);
     67 static void rfcomm_linkmode(void *, int);
     68 static void rfcomm_input(void *, struct mbuf *);
     69 
     70 static const struct btproto rfcomm_proto = {
     71 	rfcomm_connecting,
     72 	rfcomm_connected,
     73 	rfcomm_disconnected,
     74 	rfcomm_newconn,
     75 	rfcomm_complete,
     76 	rfcomm_linkmode,
     77 	rfcomm_input,
     78 };
     79 
     80 /* sysctl variables */
     81 int rfcomm_sendspace = 4096;
     82 int rfcomm_recvspace = 4096;
     83 
     84 static int
     85 rfcomm_attach(struct socket *so, int proto)
     86 {
     87 	int error;
     88 
     89 	KASSERT(so->so_pcb == NULL);
     90 
     91 	if (so->so_lock == NULL) {
     92 		mutex_obj_hold(bt_lock);
     93 		so->so_lock = bt_lock;
     94 		solock(so);
     95 	}
     96 	KASSERT(solocked(so));
     97 
     98 	/*
     99 	 * Since we have nothing to add, we attach the DLC
    100 	 * structure directly to our PCB pointer.
    101 	 */
    102 	error = soreserve(so, rfcomm_sendspace, rfcomm_recvspace);
    103 	if (error)
    104 		return error;
    105 
    106 	error = rfcomm_attach_pcb((struct rfcomm_dlc **)&so->so_pcb,
    107 				&rfcomm_proto, so);
    108 	if (error)
    109 		return error;
    110 
    111 	error = rfcomm_rcvd_pcb(so->so_pcb, sbspace(&so->so_rcv));
    112 	if (error) {
    113 		rfcomm_detach_pcb((struct rfcomm_dlc **)&so->so_pcb);
    114 		return error;
    115 	}
    116 	return 0;
    117 }
    118 
    119 static void
    120 rfcomm_detach(struct socket *so)
    121 {
    122 	KASSERT(so->so_pcb != NULL);
    123 	rfcomm_detach_pcb((struct rfcomm_dlc **)&so->so_pcb);
    124 	KASSERT(so->so_pcb == NULL);
    125 }
    126 
    127 static int
    128 rfcomm_accept(struct socket *so, struct mbuf *nam)
    129 {
    130 	struct rfcomm_dlc *pcb = so->so_pcb;
    131 	struct sockaddr_bt *sa;
    132 
    133 	KASSERT(solocked(so));
    134 	KASSERT(nam != NULL);
    135 
    136 	if (pcb == NULL)
    137 		return EINVAL;
    138 
    139 	sa = mtod(nam, struct sockaddr_bt *);
    140 	nam->m_len = sizeof(struct sockaddr_bt);
    141 	return rfcomm_peeraddr_pcb(pcb, sa);
    142 }
    143 
    144 static int
    145 rfcomm_bind(struct socket *so, struct mbuf *nam, struct lwp *l)
    146 {
    147 	struct rfcomm_dlc *pcb = so->so_pcb;
    148 	struct sockaddr_bt *sa;
    149 
    150 	KASSERT(solocked(so));
    151 	KASSERT(nam != NULL);
    152 
    153 	if (pcb == NULL)
    154 		return EINVAL;
    155 
    156 	sa = mtod(nam, struct sockaddr_bt *);
    157 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    158 		return EINVAL;
    159 
    160 	if (sa->bt_family != AF_BLUETOOTH)
    161 		return EAFNOSUPPORT;
    162 
    163 	return rfcomm_bind_pcb(pcb, sa);
    164 }
    165 
    166 static int
    167 rfcomm_listen(struct socket *so, struct lwp *l)
    168 {
    169 	struct rfcomm_dlc *pcb = so->so_pcb;
    170 
    171 	KASSERT(solocked(so));
    172 
    173 	if (pcb == NULL)
    174 		return EINVAL;
    175 
    176 	return rfcomm_listen_pcb(pcb);
    177 }
    178 
    179 static int
    180 rfcomm_connect(struct socket *so, struct mbuf *nam, struct lwp *l)
    181 {
    182 	struct rfcomm_dlc *pcb = so->so_pcb;
    183 	struct sockaddr_bt *sa;
    184 
    185 	KASSERT(solocked(so));
    186 	KASSERT(nam != NULL);
    187 
    188 	if (pcb == NULL)
    189 		return EINVAL;
    190 
    191 	sa = mtod(nam, struct sockaddr_bt *);
    192 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    193 		return EINVAL;
    194 
    195 	if (sa->bt_family != AF_BLUETOOTH)
    196 		return EAFNOSUPPORT;
    197 
    198 	soisconnecting(so);
    199 	return rfcomm_connect_pcb(pcb, sa);
    200 }
    201 
    202 static int
    203 rfcomm_connect2(struct socket *so, struct socket *so2)
    204 {
    205 	struct rfcomm_dlc *pcb = so->so_pcb;
    206 
    207 	KASSERT(solocked(so));
    208 
    209 	if (pcb == NULL)
    210 		return EINVAL;
    211 
    212 	return EOPNOTSUPP;
    213 }
    214 
    215 static int
    216 rfcomm_disconnect(struct socket *so)
    217 {
    218 	struct rfcomm_dlc *pcb = so->so_pcb;
    219 
    220 	KASSERT(solocked(so));
    221 
    222 	if (pcb == NULL)
    223 		return EINVAL;
    224 
    225 	soisdisconnecting(so);
    226 	return rfcomm_disconnect_pcb(pcb, so->so_linger);
    227 }
    228 
    229 static int
    230 rfcomm_shutdown(struct socket *so)
    231 {
    232 	KASSERT(solocked(so));
    233 
    234 	socantsendmore(so);
    235 	return 0;
    236 }
    237 
    238 static int
    239 rfcomm_abort(struct socket *so)
    240 {
    241 	struct rfcomm_dlc *pcb = so->so_pcb;
    242 
    243 	KASSERT(solocked(so));
    244 
    245 	if (pcb == NULL)
    246 		return EINVAL;
    247 
    248 	rfcomm_disconnect_pcb(pcb, 0);
    249 	soisdisconnected(so);
    250 	rfcomm_detach(so);
    251 	return 0;
    252 }
    253 
    254 static int
    255 rfcomm_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    256 {
    257 	return EPASSTHROUGH;
    258 }
    259 
    260 static int
    261 rfcomm_stat(struct socket *so, struct stat *ub)
    262 {
    263 	KASSERT(solocked(so));
    264 
    265 	return 0;
    266 }
    267 
    268 static int
    269 rfcomm_peeraddr(struct socket *so, struct mbuf *nam)
    270 {
    271 	struct rfcomm_dlc *pcb = so->so_pcb;
    272 	struct sockaddr_bt *sa;
    273 
    274 	KASSERT(solocked(so));
    275 	KASSERT(pcb != NULL);
    276 	KASSERT(nam != NULL);
    277 
    278 	sa = mtod(nam, struct sockaddr_bt *);
    279 	nam->m_len = sizeof(struct sockaddr_bt);
    280 	return rfcomm_peeraddr_pcb(pcb, sa);
    281 }
    282 
    283 static int
    284 rfcomm_sockaddr(struct socket *so, struct mbuf *nam)
    285 {
    286 	struct rfcomm_dlc *pcb = so->so_pcb;
    287 	struct sockaddr_bt *sa;
    288 
    289 	KASSERT(solocked(so));
    290 	KASSERT(pcb != NULL);
    291 	KASSERT(nam != NULL);
    292 
    293 	sa = mtod(nam, struct sockaddr_bt *);
    294 	nam->m_len = sizeof(struct sockaddr_bt);
    295 	return rfcomm_sockaddr_pcb(pcb, sa);
    296 }
    297 
    298 static int
    299 rfcomm_rcvd(struct socket *so, int flags, struct lwp *l)
    300 {
    301 	struct rfcomm_dlc *pcb = so->so_pcb;
    302 
    303 	KASSERT(solocked(so));
    304 
    305 	if (pcb == NULL)
    306 		return EINVAL;
    307 
    308 	return rfcomm_rcvd_pcb(pcb, sbspace(&so->so_rcv));
    309 }
    310 
    311 static int
    312 rfcomm_recvoob(struct socket *so, struct mbuf *m, int flags)
    313 {
    314 	KASSERT(solocked(so));
    315 
    316 	return EOPNOTSUPP;
    317 }
    318 
    319 static int
    320 rfcomm_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
    321     struct mbuf *control, struct lwp *l)
    322 {
    323 	struct rfcomm_dlc *pcb = so->so_pcb;
    324 	int err = 0;
    325 	struct mbuf *m0;
    326 
    327 	KASSERT(solocked(so));
    328 	KASSERT(m != NULL);
    329 
    330 	if (control)	/* no use for that */
    331 		m_freem(control);
    332 
    333 	if (pcb == NULL) {
    334 		err = EINVAL;
    335 		goto release;
    336 	}
    337 
    338 	m0 = m_copypacket(m, M_DONTWAIT);
    339 	if (m0 == NULL) {
    340 		err = ENOMEM;
    341 		goto release;
    342 	}
    343 
    344 	sbappendstream(&so->so_snd, m);
    345 	return rfcomm_send_pcb(pcb, m0);
    346 
    347 release:
    348 	m_freem(m);
    349 	return err;
    350 }
    351 
    352 static int
    353 rfcomm_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    354 {
    355 	KASSERT(solocked(so));
    356 
    357 	if (m)
    358 		m_freem(m);
    359 	if (control)
    360 		m_freem(control);
    361 
    362 	return EOPNOTSUPP;
    363 }
    364 
    365 static int
    366 rfcomm_purgeif(struct socket *so, struct ifnet *ifp)
    367 {
    368 
    369 	return EOPNOTSUPP;
    370 }
    371 
    372 /*
    373  * User Request.
    374  * up is socket
    375  * m is optional mbuf chain containing message
    376  * ctl is either
    377  *	optional mbuf chain containing socket options
    378  * l is pointer to process requesting action (if any)
    379  *
    380  * we are responsible for disposing of m and ctl if
    381  * they are mbuf chains
    382  */
    383 static int
    384 rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
    385 		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    386 {
    387 	struct rfcomm_dlc *pcb = up->so_pcb;
    388 	int err = 0;
    389 
    390 	DPRINTFN(2, "%s\n", prurequests[req]);
    391 	KASSERT(req != PRU_ATTACH);
    392 	KASSERT(req != PRU_DETACH);
    393 	KASSERT(req != PRU_ACCEPT);
    394 	KASSERT(req != PRU_BIND);
    395 	KASSERT(req != PRU_LISTEN);
    396 	KASSERT(req != PRU_CONNECT);
    397 	KASSERT(req != PRU_CONNECT2);
    398 	KASSERT(req != PRU_DISCONNECT);
    399 	KASSERT(req != PRU_SHUTDOWN);
    400 	KASSERT(req != PRU_ABORT);
    401 	KASSERT(req != PRU_CONTROL);
    402 	KASSERT(req != PRU_SENSE);
    403 	KASSERT(req != PRU_PEERADDR);
    404 	KASSERT(req != PRU_SOCKADDR);
    405 	KASSERT(req != PRU_RCVD);
    406 	KASSERT(req != PRU_RCVOOB);
    407 	KASSERT(req != PRU_SEND);
    408 	KASSERT(req != PRU_SENDOOB);
    409 	KASSERT(req != PRU_PURGEIF);
    410 
    411 	if (pcb == NULL) {
    412 		err = EINVAL;
    413 		goto release;
    414 	}
    415 
    416 	switch(req) {
    417 	case PRU_FASTTIMO:
    418 	case PRU_SLOWTIMO:
    419 	case PRU_PROTORCV:
    420 	case PRU_PROTOSEND:
    421 		err = EOPNOTSUPP;
    422 		break;
    423 
    424 	default:
    425 		UNKNOWN(req);
    426 		err = EOPNOTSUPP;
    427 		break;
    428 	}
    429 
    430 release:
    431 	if (m) m_freem(m);
    432 	if (ctl) m_freem(ctl);
    433 	return err;
    434 }
    435 
    436 /*
    437  * rfcomm_ctloutput(req, socket, sockopt)
    438  *
    439  */
    440 int
    441 rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    442 {
    443 	struct rfcomm_dlc *pcb = so->so_pcb;
    444 	int err = 0;
    445 
    446 	DPRINTFN(2, "%s\n", prcorequests[req]);
    447 
    448 	if (pcb == NULL)
    449 		return EINVAL;
    450 
    451 	if (sopt->sopt_level != BTPROTO_RFCOMM)
    452 		return ENOPROTOOPT;
    453 
    454 	switch(req) {
    455 	case PRCO_GETOPT:
    456 		err = rfcomm_getopt(pcb, sopt);
    457 		break;
    458 
    459 	case PRCO_SETOPT:
    460 		err = rfcomm_setopt(pcb, sopt);
    461 		break;
    462 
    463 	default:
    464 		err = ENOPROTOOPT;
    465 		break;
    466 	}
    467 
    468 	return err;
    469 }
    470 
    471 /**********************************************************************
    472  *
    473  * RFCOMM callbacks
    474  */
    475 
    476 static void
    477 rfcomm_connecting(void *arg)
    478 {
    479 	/* struct socket *so = arg; */
    480 
    481 	KASSERT(arg != NULL);
    482 	DPRINTF("Connecting\n");
    483 }
    484 
    485 static void
    486 rfcomm_connected(void *arg)
    487 {
    488 	struct socket *so = arg;
    489 
    490 	KASSERT(so != NULL);
    491 	DPRINTF("Connected\n");
    492 	soisconnected(so);
    493 }
    494 
    495 static void
    496 rfcomm_disconnected(void *arg, int err)
    497 {
    498 	struct socket *so = arg;
    499 
    500 	KASSERT(so != NULL);
    501 	DPRINTF("Disconnected\n");
    502 
    503 	so->so_error = err;
    504 	soisdisconnected(so);
    505 }
    506 
    507 static void *
    508 rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
    509     struct sockaddr_bt *raddr)
    510 {
    511 	struct socket *so = arg;
    512 
    513 	DPRINTF("New Connection\n");
    514 	so = sonewconn(so, false);
    515 	if (so == NULL)
    516 		return NULL;
    517 
    518 	soisconnecting(so);
    519 
    520 	return so->so_pcb;
    521 }
    522 
    523 /*
    524  * rfcomm_complete(rfcomm_dlc, length)
    525  *
    526  * length bytes are sent and may be removed from socket buffer
    527  */
    528 static void
    529 rfcomm_complete(void *arg, int length)
    530 {
    531 	struct socket *so = arg;
    532 
    533 	sbdrop(&so->so_snd, length);
    534 	sowwakeup(so);
    535 }
    536 
    537 /*
    538  * rfcomm_linkmode(rfcomm_dlc, new)
    539  *
    540  * link mode change notification.
    541  */
    542 static void
    543 rfcomm_linkmode(void *arg, int new)
    544 {
    545 	struct socket *so = arg;
    546 	struct sockopt sopt;
    547 	int mode;
    548 
    549 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    550 		(new & RFCOMM_LM_AUTH ? "on" : "off"),
    551 		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
    552 		(new & RFCOMM_LM_SECURE ? "on" : "off"));
    553 
    554 	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
    555 	(void)rfcomm_getopt(so->so_pcb, &sopt);
    556 	(void)sockopt_getint(&sopt, &mode);
    557 	sockopt_destroy(&sopt);
    558 
    559 	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
    560 	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
    561 	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
    562 		rfcomm_disconnect_pcb(so->so_pcb, 0);
    563 }
    564 
    565 /*
    566  * rfcomm_input(rfcomm_dlc, mbuf)
    567  */
    568 static void
    569 rfcomm_input(void *arg, struct mbuf *m)
    570 {
    571 	struct socket *so = arg;
    572 
    573 	KASSERT(so != NULL);
    574 
    575 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    576 		printf("%s: %d bytes dropped (socket buffer full)\n",
    577 			__func__, m->m_pkthdr.len);
    578 		m_freem(m);
    579 		return;
    580 	}
    581 
    582 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    583 
    584 	sbappendstream(&so->so_rcv, m);
    585 	sorwakeup(so);
    586 }
    587 
    588 PR_WRAP_USRREQS(rfcomm)
    589 
    590 #define	rfcomm_attach		rfcomm_attach_wrapper
    591 #define	rfcomm_detach		rfcomm_detach_wrapper
    592 #define	rfcomm_accept		rfcomm_accept_wrapper
    593 #define	rfcomm_bind		rfcomm_bind_wrapper
    594 #define	rfcomm_listen		rfcomm_listen_wrapper
    595 #define	rfcomm_connect		rfcomm_connect_wrapper
    596 #define	rfcomm_connect2		rfcomm_connect2_wrapper
    597 #define	rfcomm_disconnect	rfcomm_disconnect_wrapper
    598 #define	rfcomm_shutdown		rfcomm_shutdown_wrapper
    599 #define	rfcomm_abort		rfcomm_abort_wrapper
    600 #define	rfcomm_ioctl		rfcomm_ioctl_wrapper
    601 #define	rfcomm_stat		rfcomm_stat_wrapper
    602 #define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
    603 #define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
    604 #define	rfcomm_rcvd		rfcomm_rcvd_wrapper
    605 #define	rfcomm_recvoob		rfcomm_recvoob_wrapper
    606 #define	rfcomm_send		rfcomm_send_wrapper
    607 #define	rfcomm_sendoob		rfcomm_sendoob_wrapper
    608 #define	rfcomm_purgeif		rfcomm_purgeif_wrapper
    609 #define	rfcomm_usrreq		rfcomm_usrreq_wrapper
    610 
    611 const struct pr_usrreqs rfcomm_usrreqs = {
    612 	.pr_attach	= rfcomm_attach,
    613 	.pr_detach	= rfcomm_detach,
    614 	.pr_accept	= rfcomm_accept,
    615 	.pr_bind	= rfcomm_bind,
    616 	.pr_listen	= rfcomm_listen,
    617 	.pr_connect	= rfcomm_connect,
    618 	.pr_connect2	= rfcomm_connect2,
    619 	.pr_disconnect	= rfcomm_disconnect,
    620 	.pr_shutdown	= rfcomm_shutdown,
    621 	.pr_abort	= rfcomm_abort,
    622 	.pr_ioctl	= rfcomm_ioctl,
    623 	.pr_stat	= rfcomm_stat,
    624 	.pr_peeraddr	= rfcomm_peeraddr,
    625 	.pr_sockaddr	= rfcomm_sockaddr,
    626 	.pr_rcvd	= rfcomm_rcvd,
    627 	.pr_recvoob	= rfcomm_recvoob,
    628 	.pr_send	= rfcomm_send,
    629 	.pr_sendoob	= rfcomm_sendoob,
    630 	.pr_purgeif	= rfcomm_purgeif,
    631 	.pr_generic	= rfcomm_usrreq,
    632 };
    633