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rfcomm_socket.c revision 1.28 
      1 /*	$NetBSD: rfcomm_socket.c,v 1.28 2014/07/31 03:39:35 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 1.28 2014/07/31 03:39:35 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(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)
    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)
    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)
    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_disconnect(struct socket *so)
    204 {
    205 	struct rfcomm_dlc *pcb = so->so_pcb;
    206 
    207 	KASSERT(solocked(so));
    208 
    209 	if (pcb == NULL)
    210 		return EINVAL;
    211 
    212 	soisdisconnecting(so);
    213 	return rfcomm_disconnect_pcb(pcb, so->so_linger);
    214 }
    215 
    216 static int
    217 rfcomm_shutdown(struct socket *so)
    218 {
    219 	KASSERT(solocked(so));
    220 
    221 	socantsendmore(so);
    222 	return 0;
    223 }
    224 
    225 static int
    226 rfcomm_abort(struct socket *so)
    227 {
    228 	struct rfcomm_dlc *pcb = so->so_pcb;
    229 
    230 	KASSERT(solocked(so));
    231 
    232 	if (pcb == NULL)
    233 		return EINVAL;
    234 
    235 	rfcomm_disconnect_pcb(pcb, 0);
    236 	soisdisconnected(so);
    237 	rfcomm_detach(so);
    238 	return 0;
    239 }
    240 
    241 static int
    242 rfcomm_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    243 {
    244 	return EPASSTHROUGH;
    245 }
    246 
    247 static int
    248 rfcomm_stat(struct socket *so, struct stat *ub)
    249 {
    250 	KASSERT(solocked(so));
    251 
    252 	return 0;
    253 }
    254 
    255 static int
    256 rfcomm_peeraddr(struct socket *so, struct mbuf *nam)
    257 {
    258 	struct rfcomm_dlc *pcb = so->so_pcb;
    259 	struct sockaddr_bt *sa;
    260 
    261 	KASSERT(solocked(so));
    262 	KASSERT(pcb != NULL);
    263 	KASSERT(nam != NULL);
    264 
    265 	sa = mtod(nam, struct sockaddr_bt *);
    266 	nam->m_len = sizeof(struct sockaddr_bt);
    267 	return rfcomm_peeraddr_pcb(pcb, sa);
    268 }
    269 
    270 static int
    271 rfcomm_sockaddr(struct socket *so, struct mbuf *nam)
    272 {
    273 	struct rfcomm_dlc *pcb = so->so_pcb;
    274 	struct sockaddr_bt *sa;
    275 
    276 	KASSERT(solocked(so));
    277 	KASSERT(pcb != NULL);
    278 	KASSERT(nam != NULL);
    279 
    280 	sa = mtod(nam, struct sockaddr_bt *);
    281 	nam->m_len = sizeof(struct sockaddr_bt);
    282 	return rfcomm_sockaddr_pcb(pcb, sa);
    283 }
    284 
    285 static int
    286 rfcomm_recvoob(struct socket *so, struct mbuf *m, int flags)
    287 {
    288 	KASSERT(solocked(so));
    289 
    290 	return EOPNOTSUPP;
    291 }
    292 
    293 static int
    294 rfcomm_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    295 {
    296 	KASSERT(solocked(so));
    297 
    298 	if (m)
    299 		m_freem(m);
    300 	if (control)
    301 		m_freem(control);
    302 
    303 	return EOPNOTSUPP;
    304 }
    305 
    306 /*
    307  * User Request.
    308  * up is socket
    309  * m is optional mbuf chain containing message
    310  * nam is either
    311  *	optional mbuf chain containing an address
    312  *	message flags (PRU_RCVD)
    313  * ctl is either
    314  *	optional mbuf chain containing socket options
    315  *	optional interface pointer PRU_PURGEIF
    316  * l is pointer to process requesting action (if any)
    317  *
    318  * we are responsible for disposing of m and ctl if
    319  * they are mbuf chains
    320  */
    321 static int
    322 rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
    323 		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    324 {
    325 	struct rfcomm_dlc *pcb = up->so_pcb;
    326 	struct mbuf *m0;
    327 	int err = 0;
    328 
    329 	DPRINTFN(2, "%s\n", prurequests[req]);
    330 	KASSERT(req != PRU_ATTACH);
    331 	KASSERT(req != PRU_DETACH);
    332 	KASSERT(req != PRU_ACCEPT);
    333 	KASSERT(req != PRU_BIND);
    334 	KASSERT(req != PRU_LISTEN);
    335 	KASSERT(req != PRU_CONNECT);
    336 	KASSERT(req != PRU_DISCONNECT);
    337 	KASSERT(req != PRU_SHUTDOWN);
    338 	KASSERT(req != PRU_ABORT);
    339 	KASSERT(req != PRU_CONTROL);
    340 	KASSERT(req != PRU_SENSE);
    341 	KASSERT(req != PRU_PEERADDR);
    342 	KASSERT(req != PRU_SOCKADDR);
    343 	KASSERT(req != PRU_RCVOOB);
    344 	KASSERT(req != PRU_SENDOOB);
    345 
    346 	switch (req) {
    347 	case PRU_PURGEIF:
    348 		return EOPNOTSUPP;
    349 	}
    350 	if (pcb == NULL) {
    351 		err = EINVAL;
    352 		goto release;
    353 	}
    354 
    355 	switch(req) {
    356 	case PRU_SEND:
    357 		KASSERT(m != NULL);
    358 
    359 		if (ctl)	/* no use for that */
    360 			m_freem(ctl);
    361 
    362 		m0 = m_copypacket(m, M_DONTWAIT);
    363 		if (m0 == NULL)
    364 			return ENOMEM;
    365 
    366 		sbappendstream(&up->so_snd, m);
    367 
    368 		return rfcomm_send(pcb, m0);
    369 
    370 	case PRU_RCVD:
    371 		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
    372 
    373 	case PRU_CONNECT2:
    374 	case PRU_FASTTIMO:
    375 	case PRU_SLOWTIMO:
    376 	case PRU_PROTORCV:
    377 	case PRU_PROTOSEND:
    378 		err = EOPNOTSUPP;
    379 		break;
    380 
    381 	default:
    382 		UNKNOWN(req);
    383 		err = EOPNOTSUPP;
    384 		break;
    385 	}
    386 
    387 release:
    388 	if (m) m_freem(m);
    389 	if (ctl) m_freem(ctl);
    390 	return err;
    391 }
    392 
    393 /*
    394  * rfcomm_ctloutput(req, socket, sockopt)
    395  *
    396  */
    397 int
    398 rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    399 {
    400 	struct rfcomm_dlc *pcb = so->so_pcb;
    401 	int err = 0;
    402 
    403 	DPRINTFN(2, "%s\n", prcorequests[req]);
    404 
    405 	if (pcb == NULL)
    406 		return EINVAL;
    407 
    408 	if (sopt->sopt_level != BTPROTO_RFCOMM)
    409 		return ENOPROTOOPT;
    410 
    411 	switch(req) {
    412 	case PRCO_GETOPT:
    413 		err = rfcomm_getopt(pcb, sopt);
    414 		break;
    415 
    416 	case PRCO_SETOPT:
    417 		err = rfcomm_setopt(pcb, sopt);
    418 		break;
    419 
    420 	default:
    421 		err = ENOPROTOOPT;
    422 		break;
    423 	}
    424 
    425 	return err;
    426 }
    427 
    428 /**********************************************************************
    429  *
    430  * RFCOMM callbacks
    431  */
    432 
    433 static void
    434 rfcomm_connecting(void *arg)
    435 {
    436 	/* struct socket *so = arg; */
    437 
    438 	KASSERT(arg != NULL);
    439 	DPRINTF("Connecting\n");
    440 }
    441 
    442 static void
    443 rfcomm_connected(void *arg)
    444 {
    445 	struct socket *so = arg;
    446 
    447 	KASSERT(so != NULL);
    448 	DPRINTF("Connected\n");
    449 	soisconnected(so);
    450 }
    451 
    452 static void
    453 rfcomm_disconnected(void *arg, int err)
    454 {
    455 	struct socket *so = arg;
    456 
    457 	KASSERT(so != NULL);
    458 	DPRINTF("Disconnected\n");
    459 
    460 	so->so_error = err;
    461 	soisdisconnected(so);
    462 }
    463 
    464 static void *
    465 rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
    466     struct sockaddr_bt *raddr)
    467 {
    468 	struct socket *so = arg;
    469 
    470 	DPRINTF("New Connection\n");
    471 	so = sonewconn(so, false);
    472 	if (so == NULL)
    473 		return NULL;
    474 
    475 	soisconnecting(so);
    476 
    477 	return so->so_pcb;
    478 }
    479 
    480 /*
    481  * rfcomm_complete(rfcomm_dlc, length)
    482  *
    483  * length bytes are sent and may be removed from socket buffer
    484  */
    485 static void
    486 rfcomm_complete(void *arg, int length)
    487 {
    488 	struct socket *so = arg;
    489 
    490 	sbdrop(&so->so_snd, length);
    491 	sowwakeup(so);
    492 }
    493 
    494 /*
    495  * rfcomm_linkmode(rfcomm_dlc, new)
    496  *
    497  * link mode change notification.
    498  */
    499 static void
    500 rfcomm_linkmode(void *arg, int new)
    501 {
    502 	struct socket *so = arg;
    503 	struct sockopt sopt;
    504 	int mode;
    505 
    506 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    507 		(new & RFCOMM_LM_AUTH ? "on" : "off"),
    508 		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
    509 		(new & RFCOMM_LM_SECURE ? "on" : "off"));
    510 
    511 	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
    512 	(void)rfcomm_getopt(so->so_pcb, &sopt);
    513 	(void)sockopt_getint(&sopt, &mode);
    514 	sockopt_destroy(&sopt);
    515 
    516 	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
    517 	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
    518 	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
    519 		rfcomm_disconnect_pcb(so->so_pcb, 0);
    520 }
    521 
    522 /*
    523  * rfcomm_input(rfcomm_dlc, mbuf)
    524  */
    525 static void
    526 rfcomm_input(void *arg, struct mbuf *m)
    527 {
    528 	struct socket *so = arg;
    529 
    530 	KASSERT(so != NULL);
    531 
    532 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    533 		printf("%s: %d bytes dropped (socket buffer full)\n",
    534 			__func__, m->m_pkthdr.len);
    535 		m_freem(m);
    536 		return;
    537 	}
    538 
    539 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    540 
    541 	sbappendstream(&so->so_rcv, m);
    542 	sorwakeup(so);
    543 }
    544 
    545 PR_WRAP_USRREQS(rfcomm)
    546 
    547 #define	rfcomm_attach		rfcomm_attach_wrapper
    548 #define	rfcomm_detach		rfcomm_detach_wrapper
    549 #define	rfcomm_accept		rfcomm_accept_wrapper
    550 #define	rfcomm_bind		rfcomm_bind_wrapper
    551 #define	rfcomm_listen		rfcomm_listen_wrapper
    552 #define	rfcomm_connect		rfcomm_connect_wrapper
    553 #define	rfcomm_disconnect	rfcomm_disconnect_wrapper
    554 #define	rfcomm_shutdown		rfcomm_shutdown_wrapper
    555 #define	rfcomm_abort		rfcomm_abort_wrapper
    556 #define	rfcomm_ioctl		rfcomm_ioctl_wrapper
    557 #define	rfcomm_stat		rfcomm_stat_wrapper
    558 #define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
    559 #define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
    560 #define	rfcomm_recvoob		rfcomm_recvoob_wrapper
    561 #define	rfcomm_sendoob		rfcomm_sendoob_wrapper
    562 #define	rfcomm_usrreq		rfcomm_usrreq_wrapper
    563 
    564 const struct pr_usrreqs rfcomm_usrreqs = {
    565 	.pr_attach	= rfcomm_attach,
    566 	.pr_detach	= rfcomm_detach,
    567 	.pr_accept	= rfcomm_accept,
    568 	.pr_bind	= rfcomm_bind,
    569 	.pr_listen	= rfcomm_listen,
    570 	.pr_connect	= rfcomm_connect,
    571 	.pr_disconnect	= rfcomm_disconnect,
    572 	.pr_shutdown	= rfcomm_shutdown,
    573 	.pr_abort	= rfcomm_abort,
    574 	.pr_ioctl	= rfcomm_ioctl,
    575 	.pr_stat	= rfcomm_stat,
    576 	.pr_peeraddr	= rfcomm_peeraddr,
    577 	.pr_sockaddr	= rfcomm_sockaddr,
    578 	.pr_recvoob	= rfcomm_recvoob,
    579 	.pr_sendoob	= rfcomm_sendoob,
    580 	.pr_generic	= rfcomm_usrreq,
    581 };
    582