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l2cap_socket.c revision 1.28 
      1 /*	$NetBSD: l2cap_socket.c,v 1.28 2014/08/05 05:24:26 rtr Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2005 Iain Hibbert.
      5  * Copyright (c) 2006 Itronix Inc.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. The name of Itronix Inc. may not be used to endorse
     17  *    or promote products derived from this software without specific
     18  *    prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
     24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     27  * ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: l2cap_socket.c,v 1.28 2014/08/05 05:24:26 rtr Exp $");
     35 
     36 /* load symbolic names */
     37 #ifdef BLUETOOTH_DEBUG
     38 #define PRUREQUESTS
     39 #define PRCOREQUESTS
     40 #endif
     41 
     42 #include <sys/param.h>
     43 #include <sys/domain.h>
     44 #include <sys/kernel.h>
     45 #include <sys/mbuf.h>
     46 #include <sys/proc.h>
     47 #include <sys/protosw.h>
     48 #include <sys/socket.h>
     49 #include <sys/socketvar.h>
     50 #include <sys/systm.h>
     51 
     52 #include <netbt/bluetooth.h>
     53 #include <netbt/l2cap.h>
     54 
     55 /*
     56  * L2CAP Sockets
     57  *
     58  *	SOCK_SEQPACKET - normal L2CAP connection
     59  *
     60  *	SOCK_DGRAM - connectionless L2CAP - XXX not yet
     61  */
     62 
     63 static void l2cap_connecting(void *);
     64 static void l2cap_connected(void *);
     65 static void l2cap_disconnected(void *, int);
     66 static void *l2cap_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
     67 static void l2cap_complete(void *, int);
     68 static void l2cap_linkmode(void *, int);
     69 static void l2cap_input(void *, struct mbuf *);
     70 
     71 static const struct btproto l2cap_proto = {
     72 	l2cap_connecting,
     73 	l2cap_connected,
     74 	l2cap_disconnected,
     75 	l2cap_newconn,
     76 	l2cap_complete,
     77 	l2cap_linkmode,
     78 	l2cap_input,
     79 };
     80 
     81 /* sysctl variables */
     82 int l2cap_sendspace = 4096;
     83 int l2cap_recvspace = 4096;
     84 
     85 static int
     86 l2cap_attach(struct socket *so, int proto)
     87 {
     88 	int error;
     89 
     90 	KASSERT(so->so_pcb == NULL);
     91 
     92 	if (so->so_lock == NULL) {
     93 		mutex_obj_hold(bt_lock);
     94 		so->so_lock = bt_lock;
     95 		solock(so);
     96 	}
     97 	KASSERT(solocked(so));
     98 
     99 	/*
    100 	 * For L2CAP socket PCB we just use an l2cap_channel structure
    101 	 * since we have nothing to add..
    102 	 */
    103 	error = soreserve(so, l2cap_sendspace, l2cap_recvspace);
    104 	if (error)
    105 		return error;
    106 
    107 	return l2cap_attach_pcb((struct l2cap_channel **)&so->so_pcb,
    108 				&l2cap_proto, so);
    109 }
    110 
    111 static void
    112 l2cap_detach(struct socket *so)
    113 {
    114 	KASSERT(so->so_pcb != NULL);
    115 	l2cap_detach_pcb((struct l2cap_channel **)&so->so_pcb);
    116 	KASSERT(so->so_pcb == NULL);
    117 }
    118 
    119 static int
    120 l2cap_accept(struct socket *so, struct mbuf *nam)
    121 {
    122 	struct l2cap_channel *pcb = so->so_pcb;
    123 	struct sockaddr_bt *sa;
    124 
    125 	KASSERT(solocked(so));
    126 	KASSERT(nam != NULL);
    127 
    128 	if (pcb == NULL)
    129 		return EINVAL;
    130 
    131 	sa = mtod(nam, struct sockaddr_bt *);
    132 	nam->m_len = sizeof(struct sockaddr_bt);
    133 	return l2cap_peeraddr_pcb(pcb, sa);
    134 }
    135 
    136 static int
    137 l2cap_bind(struct socket *so, struct mbuf *nam, struct lwp *l)
    138 {
    139 	struct l2cap_channel *pcb = so->so_pcb;
    140 	struct sockaddr_bt *sa;
    141 
    142 	KASSERT(solocked(so));
    143 	KASSERT(nam != NULL);
    144 
    145 	if (pcb == NULL)
    146 		return EINVAL;
    147 
    148 	sa = mtod(nam, struct sockaddr_bt *);
    149 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    150 		return EINVAL;
    151 
    152 	if (sa->bt_family != AF_BLUETOOTH)
    153 		return EAFNOSUPPORT;
    154 
    155 	return l2cap_bind_pcb(pcb, sa);
    156 }
    157 
    158 static int
    159 l2cap_listen(struct socket *so, struct lwp *l)
    160 {
    161 	struct l2cap_channel *pcb = so->so_pcb;
    162 
    163 	KASSERT(solocked(so));
    164 
    165 	if (pcb == NULL)
    166 		return EINVAL;
    167 
    168 	return l2cap_listen_pcb(pcb);
    169 }
    170 
    171 static int
    172 l2cap_connect(struct socket *so, struct mbuf *nam, struct lwp *l)
    173 {
    174 	struct l2cap_channel *pcb = so->so_pcb;
    175 	struct sockaddr_bt *sa;
    176 
    177 	KASSERT(solocked(so));
    178 	KASSERT(nam != NULL);
    179 
    180 	if (pcb == NULL)
    181 		return EINVAL;
    182 
    183 	sa = mtod(nam, struct sockaddr_bt *);
    184 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    185 		return EINVAL;
    186 
    187 	if (sa->bt_family != AF_BLUETOOTH)
    188 		return EAFNOSUPPORT;
    189 
    190 	soisconnecting(so);
    191 	return l2cap_connect_pcb(pcb, sa);
    192 }
    193 
    194 static int
    195 l2cap_disconnect(struct socket *so)
    196 {
    197 	struct l2cap_channel *pcb = so->so_pcb;
    198 
    199 	KASSERT(solocked(so));
    200 
    201 	if (pcb == NULL)
    202 		return EINVAL;
    203 
    204 	soisdisconnecting(so);
    205 	return l2cap_disconnect_pcb(pcb, so->so_linger);
    206 }
    207 
    208 static int
    209 l2cap_shutdown(struct socket *so)
    210 {
    211 	KASSERT(solocked(so));
    212 
    213 	socantsendmore(so);
    214 	return 0;
    215 }
    216 
    217 static int
    218 l2cap_abort(struct socket *so)
    219 {
    220 	struct l2cap_channel *pcb = so->so_pcb;
    221 
    222 	KASSERT(solocked(so));
    223 
    224 	if (pcb == NULL)
    225 		return EINVAL;
    226 
    227 	l2cap_disconnect_pcb(pcb, 0);
    228 	soisdisconnected(so);
    229 	l2cap_detach(so);
    230 	return 0;
    231 }
    232 
    233 static int
    234 l2cap_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    235 {
    236 	return EPASSTHROUGH;
    237 }
    238 
    239 static int
    240 l2cap_stat(struct socket *so, struct stat *ub)
    241 {
    242 	KASSERT(solocked(so));
    243 
    244 	return 0;
    245 }
    246 
    247 static int
    248 l2cap_peeraddr(struct socket *so, struct mbuf *nam)
    249 {
    250 	struct l2cap_channel *pcb = so->so_pcb;
    251 	struct sockaddr_bt *sa;
    252 
    253 	KASSERT(solocked(so));
    254 	KASSERT(pcb != NULL);
    255 	KASSERT(nam != NULL);
    256 
    257 	sa = mtod(nam, struct sockaddr_bt *);
    258 	nam->m_len = sizeof(struct sockaddr_bt);
    259 	return l2cap_peeraddr_pcb(pcb, sa);
    260 }
    261 
    262 static int
    263 l2cap_sockaddr(struct socket *so, struct mbuf *nam)
    264 {
    265 	struct l2cap_channel *pcb = so->so_pcb;
    266 	struct sockaddr_bt *sa;
    267 
    268 	KASSERT(solocked(so));
    269 	KASSERT(pcb != NULL);
    270 	KASSERT(nam != NULL);
    271 
    272 	sa = mtod(nam, struct sockaddr_bt *);
    273 	nam->m_len = sizeof(struct sockaddr_bt);
    274 	return l2cap_sockaddr_pcb(pcb, sa);
    275 }
    276 
    277 static int
    278 l2cap_recvoob(struct socket *so, struct mbuf *m, int flags)
    279 {
    280 	KASSERT(solocked(so));
    281 
    282 	return EOPNOTSUPP;
    283 }
    284 
    285 static int
    286 l2cap_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    287 {
    288 	KASSERT(solocked(so));
    289 
    290 	if (m)
    291 		m_freem(m);
    292 	if (control)
    293 		m_freem(control);
    294 
    295 	return EOPNOTSUPP;
    296 }
    297 
    298 /*
    299  * User Request.
    300  * up is socket
    301  * m is optional mbuf chain containing message
    302  * nam is either
    303  *	optional mbuf chain containing an address
    304  *	message flags (PRU_RCVD)
    305  * ctl is either
    306  *	optional mbuf chain containing socket options
    307  *	optional interface pointer PRU_PURGEIF
    308  * l is pointer to process requesting action (if any)
    309  *
    310  * we are responsible for disposing of m and ctl if
    311  * they are mbuf chains
    312  */
    313 static int
    314 l2cap_usrreq(struct socket *up, int req, struct mbuf *m,
    315     struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    316 {
    317 	struct l2cap_channel *pcb = up->so_pcb;
    318 	struct mbuf *m0;
    319 	int err = 0;
    320 
    321 	DPRINTFN(2, "%s\n", prurequests[req]);
    322 	KASSERT(req != PRU_ATTACH);
    323 	KASSERT(req != PRU_DETACH);
    324 	KASSERT(req != PRU_ACCEPT);
    325 	KASSERT(req != PRU_BIND);
    326 	KASSERT(req != PRU_LISTEN);
    327 	KASSERT(req != PRU_CONNECT);
    328 	KASSERT(req != PRU_DISCONNECT);
    329 	KASSERT(req != PRU_SHUTDOWN);
    330 	KASSERT(req != PRU_ABORT);
    331 	KASSERT(req != PRU_CONTROL);
    332 	KASSERT(req != PRU_SENSE);
    333 	KASSERT(req != PRU_PEERADDR);
    334 	KASSERT(req != PRU_SOCKADDR);
    335 	KASSERT(req != PRU_RCVOOB);
    336 	KASSERT(req != PRU_SENDOOB);
    337 
    338 	switch (req) {
    339 	case PRU_PURGEIF:
    340 		return EOPNOTSUPP;
    341 	}
    342 
    343 	if (pcb == NULL) {
    344 		err = EINVAL;
    345 		goto release;
    346 	}
    347 
    348 	switch(req) {
    349 	case PRU_SEND:
    350 		KASSERT(m != NULL);
    351 		if (m->m_pkthdr.len == 0)
    352 			break;
    353 
    354 		if (m->m_pkthdr.len > pcb->lc_omtu) {
    355 			err = EMSGSIZE;
    356 			break;
    357 		}
    358 
    359 		m0 = m_copypacket(m, M_DONTWAIT);
    360 		if (m0 == NULL) {
    361 			err = ENOMEM;
    362 			break;
    363 		}
    364 
    365 		if (ctl)	/* no use for that */
    366 			m_freem(ctl);
    367 
    368 		sbappendrecord(&up->so_snd, m);
    369 		return l2cap_send(pcb, m0);
    370 
    371 	case PRU_RCVD:
    372 		return EOPNOTSUPP;	/* (no release) */
    373 
    374 	case PRU_CONNECT2:
    375 	case PRU_FASTTIMO:
    376 	case PRU_SLOWTIMO:
    377 	case PRU_PROTORCV:
    378 	case PRU_PROTOSEND:
    379 		err = EOPNOTSUPP;
    380 		break;
    381 
    382 	default:
    383 		UNKNOWN(req);
    384 		err = EOPNOTSUPP;
    385 		break;
    386 	}
    387 
    388 release:
    389 	if (m) m_freem(m);
    390 	if (ctl) m_freem(ctl);
    391 	return err;
    392 }
    393 
    394 /*
    395  * l2cap_ctloutput(req, socket, sockopt)
    396  *
    397  *	Apply configuration commands to channel. This corresponds to
    398  *	"Reconfigure Channel Request" in the L2CAP specification.
    399  */
    400 int
    401 l2cap_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    402 {
    403 	struct l2cap_channel *pcb = so->so_pcb;
    404 	int err = 0;
    405 
    406 	DPRINTFN(2, "%s\n", prcorequests[req]);
    407 
    408 	if (pcb == NULL)
    409 		return EINVAL;
    410 
    411 	if (sopt->sopt_level != BTPROTO_L2CAP)
    412 		return ENOPROTOOPT;
    413 
    414 	switch(req) {
    415 	case PRCO_GETOPT:
    416 		err = l2cap_getopt(pcb, sopt);
    417 		break;
    418 
    419 	case PRCO_SETOPT:
    420 		err = l2cap_setopt(pcb, sopt);
    421 		break;
    422 
    423 	default:
    424 		err = ENOPROTOOPT;
    425 		break;
    426 	}
    427 
    428 	return err;
    429 }
    430 
    431 /**********************************************************************
    432  *
    433  *	L2CAP Protocol socket callbacks
    434  *
    435  */
    436 
    437 static void
    438 l2cap_connecting(void *arg)
    439 {
    440 	struct socket *so = arg;
    441 
    442 	DPRINTF("Connecting\n");
    443 	soisconnecting(so);
    444 }
    445 
    446 static void
    447 l2cap_connected(void *arg)
    448 {
    449 	struct socket *so = arg;
    450 
    451 	DPRINTF("Connected\n");
    452 	soisconnected(so);
    453 }
    454 
    455 static void
    456 l2cap_disconnected(void *arg, int err)
    457 {
    458 	struct socket *so = arg;
    459 
    460 	DPRINTF("Disconnected (%d)\n", err);
    461 
    462 	so->so_error = err;
    463 	soisdisconnected(so);
    464 }
    465 
    466 static void *
    467 l2cap_newconn(void *arg, struct sockaddr_bt *laddr,
    468     struct sockaddr_bt *raddr)
    469 {
    470 	struct socket *so = arg;
    471 
    472 	DPRINTF("New Connection\n");
    473 	so = sonewconn(so, false);
    474 	if (so == NULL)
    475 		return NULL;
    476 
    477 	soisconnecting(so);
    478 
    479 	return so->so_pcb;
    480 }
    481 
    482 static void
    483 l2cap_complete(void *arg, int count)
    484 {
    485 	struct socket *so = arg;
    486 
    487 	while (count-- > 0)
    488 		sbdroprecord(&so->so_snd);
    489 
    490 	sowwakeup(so);
    491 }
    492 
    493 static void
    494 l2cap_linkmode(void *arg, int new)
    495 {
    496 	struct socket *so = arg;
    497 	struct sockopt sopt;
    498 	int mode;
    499 
    500 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    501 		(new & L2CAP_LM_AUTH ? "on" : "off"),
    502 		(new & L2CAP_LM_ENCRYPT ? "on" : "off"),
    503 		(new & L2CAP_LM_SECURE ? "on" : "off"));
    504 
    505 	sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0);
    506 	(void)l2cap_getopt(so->so_pcb, &sopt);
    507 	(void)sockopt_getint(&sopt, &mode);
    508 	sockopt_destroy(&sopt);
    509 
    510 	if (((mode & L2CAP_LM_AUTH) && !(new & L2CAP_LM_AUTH))
    511 	    || ((mode & L2CAP_LM_ENCRYPT) && !(new & L2CAP_LM_ENCRYPT))
    512 	    || ((mode & L2CAP_LM_SECURE) && !(new & L2CAP_LM_SECURE)))
    513 		l2cap_disconnect_pcb(so->so_pcb, 0);
    514 }
    515 
    516 static void
    517 l2cap_input(void *arg, struct mbuf *m)
    518 {
    519 	struct socket *so = arg;
    520 
    521 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    522 		printf("%s: packet (%d bytes) dropped (socket buffer full)\n",
    523 			__func__, m->m_pkthdr.len);
    524 		m_freem(m);
    525 		return;
    526 	}
    527 
    528 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    529 
    530 	sbappendrecord(&so->so_rcv, m);
    531 	sorwakeup(so);
    532 }
    533 
    534 PR_WRAP_USRREQS(l2cap)
    535 
    536 #define	l2cap_attach		l2cap_attach_wrapper
    537 #define	l2cap_detach		l2cap_detach_wrapper
    538 #define	l2cap_accept		l2cap_accept_wrapper
    539 #define	l2cap_bind		l2cap_bind_wrapper
    540 #define	l2cap_listen		l2cap_listen_wrapper
    541 #define	l2cap_connect		l2cap_connect_wrapper
    542 #define	l2cap_disconnect	l2cap_disconnect_wrapper
    543 #define	l2cap_shutdown		l2cap_shutdown_wrapper
    544 #define	l2cap_abort		l2cap_abort_wrapper
    545 #define	l2cap_ioctl		l2cap_ioctl_wrapper
    546 #define	l2cap_stat		l2cap_stat_wrapper
    547 #define	l2cap_peeraddr		l2cap_peeraddr_wrapper
    548 #define	l2cap_sockaddr		l2cap_sockaddr_wrapper
    549 #define	l2cap_recvoob		l2cap_recvoob_wrapper
    550 #define	l2cap_sendoob		l2cap_sendoob_wrapper
    551 #define	l2cap_usrreq		l2cap_usrreq_wrapper
    552 
    553 const struct pr_usrreqs l2cap_usrreqs = {
    554 	.pr_attach	= l2cap_attach,
    555 	.pr_detach	= l2cap_detach,
    556 	.pr_accept	= l2cap_accept,
    557 	.pr_bind	= l2cap_bind,
    558 	.pr_listen	= l2cap_listen,
    559 	.pr_connect	= l2cap_connect,
    560 	.pr_disconnect	= l2cap_disconnect,
    561 	.pr_shutdown	= l2cap_shutdown,
    562 	.pr_abort	= l2cap_abort,
    563 	.pr_ioctl	= l2cap_ioctl,
    564 	.pr_stat	= l2cap_stat,
    565 	.pr_peeraddr	= l2cap_peeraddr,
    566 	.pr_sockaddr	= l2cap_sockaddr,
    567 	.pr_recvoob	= l2cap_recvoob,
    568 	.pr_sendoob	= l2cap_sendoob,
    569 	.pr_generic	= l2cap_usrreq,
    570 };
    571