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rfcomm_socket.c revision 1.26 
      1 /*	$NetBSD: rfcomm_socket.c,v 1.26 2014/07/24 15:12:03 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 1.26 2014/07/24 15:12:03 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_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    181 {
    182 	return EPASSTHROUGH;
    183 }
    184 
    185 static int
    186 rfcomm_stat(struct socket *so, struct stat *ub)
    187 {
    188 	KASSERT(solocked(so));
    189 
    190 	return 0;
    191 }
    192 
    193 static int
    194 rfcomm_peeraddr(struct socket *so, struct mbuf *nam)
    195 {
    196 	struct rfcomm_dlc *pcb = so->so_pcb;
    197 	struct sockaddr_bt *sa;
    198 
    199 	KASSERT(solocked(so));
    200 	KASSERT(pcb != NULL);
    201 	KASSERT(nam != NULL);
    202 
    203 	sa = mtod(nam, struct sockaddr_bt *);
    204 	nam->m_len = sizeof(struct sockaddr_bt);
    205 	return rfcomm_peeraddr_pcb(pcb, sa);
    206 }
    207 
    208 static int
    209 rfcomm_sockaddr(struct socket *so, struct mbuf *nam)
    210 {
    211 	struct rfcomm_dlc *pcb = so->so_pcb;
    212 	struct sockaddr_bt *sa;
    213 
    214 	KASSERT(solocked(so));
    215 	KASSERT(pcb != NULL);
    216 	KASSERT(nam != NULL);
    217 
    218 	sa = mtod(nam, struct sockaddr_bt *);
    219 	nam->m_len = sizeof(struct sockaddr_bt);
    220 	return rfcomm_sockaddr_pcb(pcb, sa);
    221 }
    222 
    223 static int
    224 rfcomm_recvoob(struct socket *so, struct mbuf *m, int flags)
    225 {
    226 	KASSERT(solocked(so));
    227 
    228 	return EOPNOTSUPP;
    229 }
    230 
    231 static int
    232 rfcomm_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    233 {
    234 	KASSERT(solocked(so));
    235 
    236 	if (m)
    237 		m_freem(m);
    238 	if (control)
    239 		m_freem(control);
    240 
    241 	return EOPNOTSUPP;
    242 }
    243 
    244 /*
    245  * User Request.
    246  * up is socket
    247  * m is optional mbuf chain containing message
    248  * nam is either
    249  *	optional mbuf chain containing an address
    250  *	message flags (PRU_RCVD)
    251  * ctl is either
    252  *	optional mbuf chain containing socket options
    253  *	optional interface pointer PRU_PURGEIF
    254  * l is pointer to process requesting action (if any)
    255  *
    256  * we are responsible for disposing of m and ctl if
    257  * they are mbuf chains
    258  */
    259 static int
    260 rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
    261 		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    262 {
    263 	struct rfcomm_dlc *pcb = up->so_pcb;
    264 	struct sockaddr_bt *sa;
    265 	struct mbuf *m0;
    266 	int err = 0;
    267 
    268 	DPRINTFN(2, "%s\n", prurequests[req]);
    269 	KASSERT(req != PRU_ATTACH);
    270 	KASSERT(req != PRU_DETACH);
    271 	KASSERT(req != PRU_ACCEPT);
    272 	KASSERT(req != PRU_BIND);
    273 	KASSERT(req != PRU_LISTEN);
    274 	KASSERT(req != PRU_CONTROL);
    275 	KASSERT(req != PRU_SENSE);
    276 	KASSERT(req != PRU_PEERADDR);
    277 	KASSERT(req != PRU_SOCKADDR);
    278 	KASSERT(req != PRU_RCVOOB);
    279 	KASSERT(req != PRU_SENDOOB);
    280 
    281 	switch (req) {
    282 	case PRU_PURGEIF:
    283 		return EOPNOTSUPP;
    284 	}
    285 	if (pcb == NULL) {
    286 		err = EINVAL;
    287 		goto release;
    288 	}
    289 
    290 	switch(req) {
    291 	case PRU_DISCONNECT:
    292 		soisdisconnecting(up);
    293 		return rfcomm_disconnect(pcb, up->so_linger);
    294 
    295 	case PRU_ABORT:
    296 		rfcomm_disconnect(pcb, 0);
    297 		soisdisconnected(up);
    298 		rfcomm_detach(up);
    299 		return 0;
    300 
    301 	case PRU_CONNECT:
    302 		KASSERT(nam != NULL);
    303 		sa = mtod(nam, struct sockaddr_bt *);
    304 
    305 		if (sa->bt_len != sizeof(struct sockaddr_bt))
    306 			return EINVAL;
    307 
    308 		if (sa->bt_family != AF_BLUETOOTH)
    309 			return EAFNOSUPPORT;
    310 
    311 		soisconnecting(up);
    312 		return rfcomm_connect(pcb, sa);
    313 
    314 	case PRU_SHUTDOWN:
    315 		socantsendmore(up);
    316 		break;
    317 
    318 	case PRU_SEND:
    319 		KASSERT(m != NULL);
    320 
    321 		if (ctl)	/* no use for that */
    322 			m_freem(ctl);
    323 
    324 		m0 = m_copypacket(m, M_DONTWAIT);
    325 		if (m0 == NULL)
    326 			return ENOMEM;
    327 
    328 		sbappendstream(&up->so_snd, m);
    329 
    330 		return rfcomm_send(pcb, m0);
    331 
    332 	case PRU_RCVD:
    333 		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
    334 
    335 	case PRU_CONNECT2:
    336 	case PRU_FASTTIMO:
    337 	case PRU_SLOWTIMO:
    338 	case PRU_PROTORCV:
    339 	case PRU_PROTOSEND:
    340 		err = EOPNOTSUPP;
    341 		break;
    342 
    343 	default:
    344 		UNKNOWN(req);
    345 		err = EOPNOTSUPP;
    346 		break;
    347 	}
    348 
    349 release:
    350 	if (m) m_freem(m);
    351 	if (ctl) m_freem(ctl);
    352 	return err;
    353 }
    354 
    355 /*
    356  * rfcomm_ctloutput(req, socket, sockopt)
    357  *
    358  */
    359 int
    360 rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    361 {
    362 	struct rfcomm_dlc *pcb = so->so_pcb;
    363 	int err = 0;
    364 
    365 	DPRINTFN(2, "%s\n", prcorequests[req]);
    366 
    367 	if (pcb == NULL)
    368 		return EINVAL;
    369 
    370 	if (sopt->sopt_level != BTPROTO_RFCOMM)
    371 		return ENOPROTOOPT;
    372 
    373 	switch(req) {
    374 	case PRCO_GETOPT:
    375 		err = rfcomm_getopt(pcb, sopt);
    376 		break;
    377 
    378 	case PRCO_SETOPT:
    379 		err = rfcomm_setopt(pcb, sopt);
    380 		break;
    381 
    382 	default:
    383 		err = ENOPROTOOPT;
    384 		break;
    385 	}
    386 
    387 	return err;
    388 }
    389 
    390 /**********************************************************************
    391  *
    392  * RFCOMM callbacks
    393  */
    394 
    395 static void
    396 rfcomm_connecting(void *arg)
    397 {
    398 	/* struct socket *so = arg; */
    399 
    400 	KASSERT(arg != NULL);
    401 	DPRINTF("Connecting\n");
    402 }
    403 
    404 static void
    405 rfcomm_connected(void *arg)
    406 {
    407 	struct socket *so = arg;
    408 
    409 	KASSERT(so != NULL);
    410 	DPRINTF("Connected\n");
    411 	soisconnected(so);
    412 }
    413 
    414 static void
    415 rfcomm_disconnected(void *arg, int err)
    416 {
    417 	struct socket *so = arg;
    418 
    419 	KASSERT(so != NULL);
    420 	DPRINTF("Disconnected\n");
    421 
    422 	so->so_error = err;
    423 	soisdisconnected(so);
    424 }
    425 
    426 static void *
    427 rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
    428     struct sockaddr_bt *raddr)
    429 {
    430 	struct socket *so = arg;
    431 
    432 	DPRINTF("New Connection\n");
    433 	so = sonewconn(so, false);
    434 	if (so == NULL)
    435 		return NULL;
    436 
    437 	soisconnecting(so);
    438 
    439 	return so->so_pcb;
    440 }
    441 
    442 /*
    443  * rfcomm_complete(rfcomm_dlc, length)
    444  *
    445  * length bytes are sent and may be removed from socket buffer
    446  */
    447 static void
    448 rfcomm_complete(void *arg, int length)
    449 {
    450 	struct socket *so = arg;
    451 
    452 	sbdrop(&so->so_snd, length);
    453 	sowwakeup(so);
    454 }
    455 
    456 /*
    457  * rfcomm_linkmode(rfcomm_dlc, new)
    458  *
    459  * link mode change notification.
    460  */
    461 static void
    462 rfcomm_linkmode(void *arg, int new)
    463 {
    464 	struct socket *so = arg;
    465 	struct sockopt sopt;
    466 	int mode;
    467 
    468 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    469 		(new & RFCOMM_LM_AUTH ? "on" : "off"),
    470 		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
    471 		(new & RFCOMM_LM_SECURE ? "on" : "off"));
    472 
    473 	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
    474 	(void)rfcomm_getopt(so->so_pcb, &sopt);
    475 	(void)sockopt_getint(&sopt, &mode);
    476 	sockopt_destroy(&sopt);
    477 
    478 	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
    479 	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
    480 	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
    481 		rfcomm_disconnect(so->so_pcb, 0);
    482 }
    483 
    484 /*
    485  * rfcomm_input(rfcomm_dlc, mbuf)
    486  */
    487 static void
    488 rfcomm_input(void *arg, struct mbuf *m)
    489 {
    490 	struct socket *so = arg;
    491 
    492 	KASSERT(so != NULL);
    493 
    494 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    495 		printf("%s: %d bytes dropped (socket buffer full)\n",
    496 			__func__, m->m_pkthdr.len);
    497 		m_freem(m);
    498 		return;
    499 	}
    500 
    501 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    502 
    503 	sbappendstream(&so->so_rcv, m);
    504 	sorwakeup(so);
    505 }
    506 
    507 PR_WRAP_USRREQS(rfcomm)
    508 
    509 #define	rfcomm_attach		rfcomm_attach_wrapper
    510 #define	rfcomm_detach		rfcomm_detach_wrapper
    511 #define	rfcomm_accept		rfcomm_accept_wrapper
    512 #define	rfcomm_bind		rfcomm_bind_wrapper
    513 #define	rfcomm_listen		rfcomm_listen_wrapper
    514 #define	rfcomm_ioctl		rfcomm_ioctl_wrapper
    515 #define	rfcomm_stat		rfcomm_stat_wrapper
    516 #define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
    517 #define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
    518 #define	rfcomm_recvoob		rfcomm_recvoob_wrapper
    519 #define	rfcomm_sendoob		rfcomm_sendoob_wrapper
    520 #define	rfcomm_usrreq		rfcomm_usrreq_wrapper
    521 
    522 const struct pr_usrreqs rfcomm_usrreqs = {
    523 	.pr_attach	= rfcomm_attach,
    524 	.pr_detach	= rfcomm_detach,
    525 	.pr_accept	= rfcomm_accept,
    526 	.pr_bind	= rfcomm_bind,
    527 	.pr_listen	= rfcomm_listen,
    528 	.pr_ioctl	= rfcomm_ioctl,
    529 	.pr_stat	= rfcomm_stat,
    530 	.pr_peeraddr	= rfcomm_peeraddr,
    531 	.pr_sockaddr	= rfcomm_sockaddr,
    532 	.pr_recvoob	= rfcomm_recvoob,
    533 	.pr_sendoob	= rfcomm_sendoob,
    534 	.pr_generic	= rfcomm_usrreq,
    535 };
    536