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rfcomm_socket.c revision 1.38 
      1 /*	$NetBSD: rfcomm_socket.c,v 1.38 2019/01/28 12:53:01 martin 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 1.38 2019/01/28 12:53:01 martin 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 sockaddr *nam)
    129 {
    130 	struct rfcomm_dlc *pcb = so->so_pcb;
    131 
    132 	KASSERT(solocked(so));
    133 	KASSERT(nam != NULL);
    134 
    135 	if (pcb == NULL)
    136 		return EINVAL;
    137 
    138 	return rfcomm_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
    139 }
    140 
    141 static int
    142 rfcomm_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
    143 {
    144 	struct rfcomm_dlc *pcb = so->so_pcb;
    145 	struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
    146 
    147 	KASSERT(solocked(so));
    148 	KASSERT(nam != NULL);
    149 
    150 	if (pcb == NULL)
    151 		return EINVAL;
    152 
    153 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    154 		return EINVAL;
    155 
    156 	if (sa->bt_family != AF_BLUETOOTH)
    157 		return EAFNOSUPPORT;
    158 
    159 	return rfcomm_bind_pcb(pcb, sa);
    160 }
    161 
    162 static int
    163 rfcomm_listen(struct socket *so, struct lwp *l)
    164 {
    165 	struct rfcomm_dlc *pcb = so->so_pcb;
    166 
    167 	KASSERT(solocked(so));
    168 
    169 	if (pcb == NULL)
    170 		return EINVAL;
    171 
    172 	return rfcomm_listen_pcb(pcb);
    173 }
    174 
    175 static int
    176 rfcomm_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
    177 {
    178 	struct rfcomm_dlc *pcb = so->so_pcb;
    179 	struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
    180 
    181 	KASSERT(solocked(so));
    182 	KASSERT(nam != NULL);
    183 
    184 	if (pcb == NULL)
    185 		return EINVAL;
    186 
    187 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    188 		return EINVAL;
    189 
    190 	if (sa->bt_family != AF_BLUETOOTH)
    191 		return EAFNOSUPPORT;
    192 
    193 	soisconnecting(so);
    194 	return rfcomm_connect_pcb(pcb, sa);
    195 }
    196 
    197 static int
    198 rfcomm_connect2(struct socket *so, struct socket *so2)
    199 {
    200 	struct rfcomm_dlc *pcb = so->so_pcb;
    201 
    202 	KASSERT(solocked(so));
    203 
    204 	if (pcb == NULL)
    205 		return EINVAL;
    206 
    207 	return EOPNOTSUPP;
    208 }
    209 
    210 static int
    211 rfcomm_disconnect(struct socket *so)
    212 {
    213 	struct rfcomm_dlc *pcb = so->so_pcb;
    214 
    215 	KASSERT(solocked(so));
    216 
    217 	if (pcb == NULL)
    218 		return EINVAL;
    219 
    220 	soisdisconnecting(so);
    221 	return rfcomm_disconnect_pcb(pcb, so->so_linger);
    222 }
    223 
    224 static int
    225 rfcomm_shutdown(struct socket *so)
    226 {
    227 	KASSERT(solocked(so));
    228 
    229 	socantsendmore(so);
    230 	return 0;
    231 }
    232 
    233 static int
    234 rfcomm_abort(struct socket *so)
    235 {
    236 	struct rfcomm_dlc *pcb = so->so_pcb;
    237 
    238 	KASSERT(solocked(so));
    239 
    240 	if (pcb == NULL)
    241 		return EINVAL;
    242 
    243 	rfcomm_disconnect_pcb(pcb, 0);
    244 	soisdisconnected(so);
    245 	rfcomm_detach(so);
    246 	return 0;
    247 }
    248 
    249 static int
    250 rfcomm_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    251 {
    252 	return EPASSTHROUGH;
    253 }
    254 
    255 static int
    256 rfcomm_stat(struct socket *so, struct stat *ub)
    257 {
    258 	KASSERT(solocked(so));
    259 
    260 	return 0;
    261 }
    262 
    263 static int
    264 rfcomm_peeraddr(struct socket *so, struct sockaddr *nam)
    265 {
    266 	struct rfcomm_dlc *pcb = so->so_pcb;
    267 
    268 	KASSERT(solocked(so));
    269 	KASSERT(pcb != NULL);
    270 	KASSERT(nam != NULL);
    271 
    272 	return rfcomm_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
    273 }
    274 
    275 static int
    276 rfcomm_sockaddr(struct socket *so, struct sockaddr *nam)
    277 {
    278 	struct rfcomm_dlc *pcb = so->so_pcb;
    279 
    280 	KASSERT(solocked(so));
    281 	KASSERT(pcb != NULL);
    282 	KASSERT(nam != NULL);
    283 
    284 	return rfcomm_sockaddr_pcb(pcb, (struct sockaddr_bt *)nam);
    285 }
    286 
    287 static int
    288 rfcomm_rcvd(struct socket *so, int flags, struct lwp *l)
    289 {
    290 	struct rfcomm_dlc *pcb = so->so_pcb;
    291 
    292 	KASSERT(solocked(so));
    293 
    294 	if (pcb == NULL)
    295 		return EINVAL;
    296 
    297 	return rfcomm_rcvd_pcb(pcb, sbspace(&so->so_rcv));
    298 }
    299 
    300 static int
    301 rfcomm_recvoob(struct socket *so, struct mbuf *m, int flags)
    302 {
    303 	KASSERT(solocked(so));
    304 
    305 	return EOPNOTSUPP;
    306 }
    307 
    308 static int
    309 rfcomm_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
    310     struct mbuf *control, struct lwp *l)
    311 {
    312 	struct rfcomm_dlc *pcb = so->so_pcb;
    313 	int err = 0;
    314 	struct mbuf *m0;
    315 
    316 	KASSERT(solocked(so));
    317 	KASSERT(m != NULL);
    318 
    319 	if (control)	/* no use for that */
    320 		m_freem(control);
    321 
    322 	if (pcb == NULL) {
    323 		err = EINVAL;
    324 		goto release;
    325 	}
    326 
    327 	m0 = m_copypacket(m, M_DONTWAIT);
    328 	if (m0 == NULL) {
    329 		err = ENOMEM;
    330 		goto release;
    331 	}
    332 
    333 	sbappendstream(&so->so_snd, m);
    334 	return rfcomm_send_pcb(pcb, m0);
    335 
    336 release:
    337 	m_freem(m);
    338 	return err;
    339 }
    340 
    341 static int
    342 rfcomm_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    343 {
    344 	KASSERT(solocked(so));
    345 
    346 	m_freem(m);
    347 	m_freem(control);
    348 
    349 	return EOPNOTSUPP;
    350 }
    351 
    352 static int
    353 rfcomm_purgeif(struct socket *so, struct ifnet *ifp)
    354 {
    355 
    356 	return EOPNOTSUPP;
    357 }
    358 
    359 /*
    360  * rfcomm_ctloutput(req, socket, sockopt)
    361  *
    362  */
    363 int
    364 rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    365 {
    366 	struct rfcomm_dlc *pcb = so->so_pcb;
    367 	int err = 0;
    368 
    369 	DPRINTFN(2, "%s\n", prcorequests[req]);
    370 
    371 	if (pcb == NULL)
    372 		return EINVAL;
    373 
    374 	if (sopt->sopt_level != BTPROTO_RFCOMM)
    375 		return ENOPROTOOPT;
    376 
    377 	switch(req) {
    378 	case PRCO_GETOPT:
    379 		err = rfcomm_getopt(pcb, sopt);
    380 		break;
    381 
    382 	case PRCO_SETOPT:
    383 		err = rfcomm_setopt(pcb, sopt);
    384 		break;
    385 
    386 	default:
    387 		err = ENOPROTOOPT;
    388 		break;
    389 	}
    390 
    391 	return err;
    392 }
    393 
    394 /**********************************************************************
    395  *
    396  * RFCOMM callbacks
    397  */
    398 
    399 static void
    400 rfcomm_connecting(void *arg)
    401 {
    402 	/* struct socket *so = arg; */
    403 
    404 	KASSERT(arg != NULL);
    405 	DPRINTF("Connecting\n");
    406 }
    407 
    408 static void
    409 rfcomm_connected(void *arg)
    410 {
    411 	struct socket *so = arg;
    412 
    413 	KASSERT(so != NULL);
    414 	DPRINTF("Connected\n");
    415 	soisconnected(so);
    416 }
    417 
    418 static void
    419 rfcomm_disconnected(void *arg, int err)
    420 {
    421 	struct socket *so = arg;
    422 
    423 	KASSERT(so != NULL);
    424 	DPRINTF("Disconnected\n");
    425 
    426 	so->so_error = err;
    427 	soisdisconnected(so);
    428 }
    429 
    430 static void *
    431 rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
    432     struct sockaddr_bt *raddr)
    433 {
    434 	struct socket *so = arg;
    435 
    436 	DPRINTF("New Connection\n");
    437 	so = sonewconn(so, false);
    438 	if (so == NULL)
    439 		return NULL;
    440 
    441 	soisconnecting(so);
    442 
    443 	return so->so_pcb;
    444 }
    445 
    446 /*
    447  * rfcomm_complete(rfcomm_dlc, length)
    448  *
    449  * length bytes are sent and may be removed from socket buffer
    450  */
    451 static void
    452 rfcomm_complete(void *arg, int length)
    453 {
    454 	struct socket *so = arg;
    455 
    456 	sbdrop(&so->so_snd, length);
    457 	sowwakeup(so);
    458 }
    459 
    460 /*
    461  * rfcomm_linkmode(rfcomm_dlc, new)
    462  *
    463  * link mode change notification.
    464  */
    465 static void
    466 rfcomm_linkmode(void *arg, int new)
    467 {
    468 	struct socket *so = arg;
    469 	struct sockopt sopt;
    470 	int mode;
    471 
    472 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    473 		(new & RFCOMM_LM_AUTH ? "on" : "off"),
    474 		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
    475 		(new & RFCOMM_LM_SECURE ? "on" : "off"));
    476 
    477 	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
    478 	(void)rfcomm_getopt(so->so_pcb, &sopt);
    479 	(void)sockopt_getint(&sopt, &mode);
    480 	sockopt_destroy(&sopt);
    481 
    482 	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
    483 	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
    484 	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
    485 		rfcomm_disconnect_pcb(so->so_pcb, 0);
    486 }
    487 
    488 /*
    489  * rfcomm_input(rfcomm_dlc, mbuf)
    490  */
    491 static void
    492 rfcomm_input(void *arg, struct mbuf *m)
    493 {
    494 	struct socket *so = arg;
    495 
    496 	KASSERT(so != NULL);
    497 
    498 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    499 		printf("%s: %d bytes dropped (socket buffer full)\n",
    500 			__func__, m->m_pkthdr.len);
    501 		m_freem(m);
    502 		return;
    503 	}
    504 
    505 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    506 
    507 	sbappendstream(&so->so_rcv, m);
    508 	sorwakeup(so);
    509 }
    510 
    511 PR_WRAP_USRREQS(rfcomm)
    512 
    513 #define	rfcomm_attach		rfcomm_attach_wrapper
    514 #define	rfcomm_detach		rfcomm_detach_wrapper
    515 #define	rfcomm_accept		rfcomm_accept_wrapper
    516 #define	rfcomm_bind		rfcomm_bind_wrapper
    517 #define	rfcomm_listen		rfcomm_listen_wrapper
    518 #define	rfcomm_connect		rfcomm_connect_wrapper
    519 #define	rfcomm_connect2		rfcomm_connect2_wrapper
    520 #define	rfcomm_disconnect	rfcomm_disconnect_wrapper
    521 #define	rfcomm_shutdown		rfcomm_shutdown_wrapper
    522 #define	rfcomm_abort		rfcomm_abort_wrapper
    523 #define	rfcomm_ioctl		rfcomm_ioctl_wrapper
    524 #define	rfcomm_stat		rfcomm_stat_wrapper
    525 #define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
    526 #define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
    527 #define	rfcomm_rcvd		rfcomm_rcvd_wrapper
    528 #define	rfcomm_recvoob		rfcomm_recvoob_wrapper
    529 #define	rfcomm_send		rfcomm_send_wrapper
    530 #define	rfcomm_sendoob		rfcomm_sendoob_wrapper
    531 #define	rfcomm_purgeif		rfcomm_purgeif_wrapper
    532 
    533 const struct pr_usrreqs rfcomm_usrreqs = {
    534 	.pr_attach	= rfcomm_attach,
    535 	.pr_detach	= rfcomm_detach,
    536 	.pr_accept	= rfcomm_accept,
    537 	.pr_bind	= rfcomm_bind,
    538 	.pr_listen	= rfcomm_listen,
    539 	.pr_connect	= rfcomm_connect,
    540 	.pr_connect2	= rfcomm_connect2,
    541 	.pr_disconnect	= rfcomm_disconnect,
    542 	.pr_shutdown	= rfcomm_shutdown,
    543 	.pr_abort	= rfcomm_abort,
    544 	.pr_ioctl	= rfcomm_ioctl,
    545 	.pr_stat	= rfcomm_stat,
    546 	.pr_peeraddr	= rfcomm_peeraddr,
    547 	.pr_sockaddr	= rfcomm_sockaddr,
    548 	.pr_rcvd	= rfcomm_rcvd,
    549 	.pr_recvoob	= rfcomm_recvoob,
    550 	.pr_send	= rfcomm_send,
    551 	.pr_sendoob	= rfcomm_sendoob,
    552 	.pr_purgeif	= rfcomm_purgeif,
    553 };
    554