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l2cap_socket.c revision 1.34 
      1 /*	$NetBSD: l2cap_socket.c,v 1.34 2015/04/26 21:40:49 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 1.34 2015/04/26 21:40:49 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 sockaddr *nam)
    121 {
    122 	struct l2cap_channel *pcb = so->so_pcb;
    123 
    124 	KASSERT(solocked(so));
    125 	KASSERT(nam != NULL);
    126 
    127 	if (pcb == NULL)
    128 		return EINVAL;
    129 
    130 	return l2cap_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
    131 }
    132 
    133 static int
    134 l2cap_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
    135 {
    136 	struct l2cap_channel *pcb = so->so_pcb;
    137 	struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
    138 
    139 	KASSERT(solocked(so));
    140 	KASSERT(nam != NULL);
    141 
    142 	if (pcb == NULL)
    143 		return EINVAL;
    144 
    145 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    146 		return EINVAL;
    147 
    148 	if (sa->bt_family != AF_BLUETOOTH)
    149 		return EAFNOSUPPORT;
    150 
    151 	return l2cap_bind_pcb(pcb, sa);
    152 }
    153 
    154 static int
    155 l2cap_listen(struct socket *so, struct lwp *l)
    156 {
    157 	struct l2cap_channel *pcb = so->so_pcb;
    158 
    159 	KASSERT(solocked(so));
    160 
    161 	if (pcb == NULL)
    162 		return EINVAL;
    163 
    164 	return l2cap_listen_pcb(pcb);
    165 }
    166 
    167 static int
    168 l2cap_connect(struct socket *so, struct mbuf *nam, struct lwp *l)
    169 {
    170 	struct l2cap_channel *pcb = so->so_pcb;
    171 	struct sockaddr_bt *sa;
    172 
    173 	KASSERT(solocked(so));
    174 	KASSERT(nam != NULL);
    175 
    176 	if (pcb == NULL)
    177 		return EINVAL;
    178 
    179 	sa = mtod(nam, struct sockaddr_bt *);
    180 	if (sa->bt_len != sizeof(struct sockaddr_bt))
    181 		return EINVAL;
    182 
    183 	if (sa->bt_family != AF_BLUETOOTH)
    184 		return EAFNOSUPPORT;
    185 
    186 	soisconnecting(so);
    187 	return l2cap_connect_pcb(pcb, sa);
    188 }
    189 
    190 static int
    191 l2cap_connect2(struct socket *so, struct socket *so2)
    192 {
    193 	KASSERT(solocked(so));
    194 
    195 	if (so->so_pcb == NULL)
    196 		return EINVAL;
    197 
    198 	return EOPNOTSUPP;
    199 }
    200 
    201 static int
    202 l2cap_disconnect(struct socket *so)
    203 {
    204 	struct l2cap_channel *pcb = so->so_pcb;
    205 
    206 	KASSERT(solocked(so));
    207 
    208 	if (pcb == NULL)
    209 		return EINVAL;
    210 
    211 	soisdisconnecting(so);
    212 	return l2cap_disconnect_pcb(pcb, so->so_linger);
    213 }
    214 
    215 static int
    216 l2cap_shutdown(struct socket *so)
    217 {
    218 	KASSERT(solocked(so));
    219 
    220 	socantsendmore(so);
    221 	return 0;
    222 }
    223 
    224 static int
    225 l2cap_abort(struct socket *so)
    226 {
    227 	struct l2cap_channel *pcb = so->so_pcb;
    228 
    229 	KASSERT(solocked(so));
    230 
    231 	if (pcb == NULL)
    232 		return EINVAL;
    233 
    234 	l2cap_disconnect_pcb(pcb, 0);
    235 	soisdisconnected(so);
    236 	l2cap_detach(so);
    237 	return 0;
    238 }
    239 
    240 static int
    241 l2cap_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    242 {
    243 	return EPASSTHROUGH;
    244 }
    245 
    246 static int
    247 l2cap_stat(struct socket *so, struct stat *ub)
    248 {
    249 	KASSERT(solocked(so));
    250 
    251 	return 0;
    252 }
    253 
    254 static int
    255 l2cap_peeraddr(struct socket *so, struct sockaddr *nam)
    256 {
    257 	struct l2cap_channel *pcb = so->so_pcb;
    258 
    259 	KASSERT(solocked(so));
    260 	KASSERT(pcb != NULL);
    261 	KASSERT(nam != NULL);
    262 
    263 	return l2cap_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
    264 }
    265 
    266 static int
    267 l2cap_sockaddr(struct socket *so, struct sockaddr *nam)
    268 {
    269 	struct l2cap_channel *pcb = so->so_pcb;
    270 
    271 	KASSERT(solocked(so));
    272 	KASSERT(pcb != NULL);
    273 	KASSERT(nam != NULL);
    274 
    275 	return l2cap_sockaddr_pcb(pcb, (struct sockaddr_bt *)nam);
    276 }
    277 
    278 static int
    279 l2cap_rcvd(struct socket *so, int flags, struct lwp *l)
    280 {
    281 	KASSERT(solocked(so));
    282 
    283 	return EOPNOTSUPP;
    284 }
    285 
    286 static int
    287 l2cap_recvoob(struct socket *so, struct mbuf *m, int flags)
    288 {
    289 	KASSERT(solocked(so));
    290 
    291 	return EOPNOTSUPP;
    292 }
    293 
    294 static int
    295 l2cap_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
    296     struct mbuf *control, struct lwp *l)
    297 {
    298 	struct l2cap_channel *pcb = so->so_pcb;
    299 	struct mbuf *m0;
    300 	int error = 0;
    301 
    302 	KASSERT(solocked(so));
    303 	KASSERT(m != NULL);
    304 
    305 	if (control)
    306 		m_freem(control);
    307 
    308 	if (pcb == NULL) {
    309 		error = EINVAL;
    310 		goto release;
    311 	}
    312 
    313 	if (m->m_pkthdr.len == 0)
    314 		goto release;
    315 
    316 	if (m->m_pkthdr.len > pcb->lc_omtu) {
    317 		error = EMSGSIZE;
    318 		goto release;
    319 	}
    320 
    321 	m0 = m_copypacket(m, M_DONTWAIT);
    322 	if (m0 == NULL) {
    323 		error = ENOMEM;
    324 		goto release;
    325 	}
    326 
    327 	sbappendrecord(&so->so_snd, m);
    328 	return l2cap_send_pcb(pcb, m0);
    329 
    330 release:
    331 	if (m)
    332 		m_freem(m);
    333 
    334 	return error;
    335 }
    336 
    337 static int
    338 l2cap_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
    339 {
    340 	KASSERT(solocked(so));
    341 
    342 	if (m)
    343 		m_freem(m);
    344 	if (control)
    345 		m_freem(control);
    346 
    347 	return EOPNOTSUPP;
    348 }
    349 
    350 static int
    351 l2cap_purgeif(struct socket *so, struct ifnet *ifp)
    352 {
    353 
    354 	return EOPNOTSUPP;
    355 }
    356 
    357 /*
    358  * l2cap_ctloutput(req, socket, sockopt)
    359  *
    360  *	Apply configuration commands to channel. This corresponds to
    361  *	"Reconfigure Channel Request" in the L2CAP specification.
    362  */
    363 int
    364 l2cap_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    365 {
    366 	struct l2cap_channel *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_L2CAP)
    375 		return ENOPROTOOPT;
    376 
    377 	switch(req) {
    378 	case PRCO_GETOPT:
    379 		err = l2cap_getopt(pcb, sopt);
    380 		break;
    381 
    382 	case PRCO_SETOPT:
    383 		err = l2cap_setopt(pcb, sopt);
    384 		break;
    385 
    386 	default:
    387 		err = ENOPROTOOPT;
    388 		break;
    389 	}
    390 
    391 	return err;
    392 }
    393 
    394 /**********************************************************************
    395  *
    396  *	L2CAP Protocol socket callbacks
    397  *
    398  */
    399 
    400 static void
    401 l2cap_connecting(void *arg)
    402 {
    403 	struct socket *so = arg;
    404 
    405 	DPRINTF("Connecting\n");
    406 	soisconnecting(so);
    407 }
    408 
    409 static void
    410 l2cap_connected(void *arg)
    411 {
    412 	struct socket *so = arg;
    413 
    414 	DPRINTF("Connected\n");
    415 	soisconnected(so);
    416 }
    417 
    418 static void
    419 l2cap_disconnected(void *arg, int err)
    420 {
    421 	struct socket *so = arg;
    422 
    423 	DPRINTF("Disconnected (%d)\n", err);
    424 
    425 	so->so_error = err;
    426 	soisdisconnected(so);
    427 }
    428 
    429 static void *
    430 l2cap_newconn(void *arg, struct sockaddr_bt *laddr,
    431     struct sockaddr_bt *raddr)
    432 {
    433 	struct socket *so = arg;
    434 
    435 	DPRINTF("New Connection\n");
    436 	so = sonewconn(so, false);
    437 	if (so == NULL)
    438 		return NULL;
    439 
    440 	soisconnecting(so);
    441 
    442 	return so->so_pcb;
    443 }
    444 
    445 static void
    446 l2cap_complete(void *arg, int count)
    447 {
    448 	struct socket *so = arg;
    449 
    450 	while (count-- > 0)
    451 		sbdroprecord(&so->so_snd);
    452 
    453 	sowwakeup(so);
    454 }
    455 
    456 static void
    457 l2cap_linkmode(void *arg, int new)
    458 {
    459 	struct socket *so = arg;
    460 	struct sockopt sopt;
    461 	int mode;
    462 
    463 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    464 		(new & L2CAP_LM_AUTH ? "on" : "off"),
    465 		(new & L2CAP_LM_ENCRYPT ? "on" : "off"),
    466 		(new & L2CAP_LM_SECURE ? "on" : "off"));
    467 
    468 	sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0);
    469 	(void)l2cap_getopt(so->so_pcb, &sopt);
    470 	(void)sockopt_getint(&sopt, &mode);
    471 	sockopt_destroy(&sopt);
    472 
    473 	if (((mode & L2CAP_LM_AUTH) && !(new & L2CAP_LM_AUTH))
    474 	    || ((mode & L2CAP_LM_ENCRYPT) && !(new & L2CAP_LM_ENCRYPT))
    475 	    || ((mode & L2CAP_LM_SECURE) && !(new & L2CAP_LM_SECURE)))
    476 		l2cap_disconnect_pcb(so->so_pcb, 0);
    477 }
    478 
    479 static void
    480 l2cap_input(void *arg, struct mbuf *m)
    481 {
    482 	struct socket *so = arg;
    483 
    484 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    485 		printf("%s: packet (%d bytes) dropped (socket buffer full)\n",
    486 			__func__, m->m_pkthdr.len);
    487 		m_freem(m);
    488 		return;
    489 	}
    490 
    491 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    492 
    493 	sbappendrecord(&so->so_rcv, m);
    494 	sorwakeup(so);
    495 }
    496 
    497 PR_WRAP_USRREQS(l2cap)
    498 
    499 #define	l2cap_attach		l2cap_attach_wrapper
    500 #define	l2cap_detach		l2cap_detach_wrapper
    501 #define	l2cap_accept		l2cap_accept_wrapper
    502 #define	l2cap_bind		l2cap_bind_wrapper
    503 #define	l2cap_listen		l2cap_listen_wrapper
    504 #define	l2cap_connect		l2cap_connect_wrapper
    505 #define	l2cap_connect2		l2cap_connect2_wrapper
    506 #define	l2cap_disconnect	l2cap_disconnect_wrapper
    507 #define	l2cap_shutdown		l2cap_shutdown_wrapper
    508 #define	l2cap_abort		l2cap_abort_wrapper
    509 #define	l2cap_ioctl		l2cap_ioctl_wrapper
    510 #define	l2cap_stat		l2cap_stat_wrapper
    511 #define	l2cap_peeraddr		l2cap_peeraddr_wrapper
    512 #define	l2cap_sockaddr		l2cap_sockaddr_wrapper
    513 #define	l2cap_rcvd		l2cap_rcvd_wrapper
    514 #define	l2cap_recvoob		l2cap_recvoob_wrapper
    515 #define	l2cap_send		l2cap_send_wrapper
    516 #define	l2cap_sendoob		l2cap_sendoob_wrapper
    517 #define	l2cap_purgeif		l2cap_purgeif_wrapper
    518 
    519 const struct pr_usrreqs l2cap_usrreqs = {
    520 	.pr_attach	= l2cap_attach,
    521 	.pr_detach	= l2cap_detach,
    522 	.pr_accept	= l2cap_accept,
    523 	.pr_bind	= l2cap_bind,
    524 	.pr_listen	= l2cap_listen,
    525 	.pr_connect	= l2cap_connect,
    526 	.pr_connect2	= l2cap_connect2,
    527 	.pr_disconnect	= l2cap_disconnect,
    528 	.pr_shutdown	= l2cap_shutdown,
    529 	.pr_abort	= l2cap_abort,
    530 	.pr_ioctl	= l2cap_ioctl,
    531 	.pr_stat	= l2cap_stat,
    532 	.pr_peeraddr	= l2cap_peeraddr,
    533 	.pr_sockaddr	= l2cap_sockaddr,
    534 	.pr_rcvd	= l2cap_rcvd,
    535 	.pr_recvoob	= l2cap_recvoob,
    536 	.pr_send	= l2cap_send,
    537 	.pr_sendoob	= l2cap_sendoob,
    538 	.pr_purgeif	= l2cap_purgeif,
    539 };
    540