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l2cap_socket.c revision 1.22 
      1 /*	$NetBSD: l2cap_socket.c,v 1.22 2014/07/09 04:54:03 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 1.22 2014/07/09 04:54:03 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_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
    121 {
    122 	return EPASSTHROUGH;
    123 }
    124 
    125 static int
    126 l2cap_stat(struct socket *so, struct stat *ub)
    127 {
    128 	KASSERT(solocked(so));
    129 
    130 	return 0;
    131 }
    132 
    133 static int
    134 l2cap_peeraddr(struct socket *so, struct mbuf *nam)
    135 {
    136 	struct l2cap_channel *pcb = so->so_pcb;
    137 	struct sockaddr_bt *sa;
    138 
    139 	KASSERT(solocked(so));
    140 	KASSERT(pcb != NULL);
    141 	KASSERT(nam != NULL);
    142 
    143 	sa = mtod(nam, struct sockaddr_bt *);
    144 	nam->m_len = sizeof(struct sockaddr_bt);
    145 	return l2cap_peeraddr_pcb(pcb, sa);
    146 }
    147 
    148 static int
    149 l2cap_sockaddr(struct socket *so, struct mbuf *nam)
    150 {
    151 	struct l2cap_channel *pcb = so->so_pcb;
    152 	struct sockaddr_bt *sa;
    153 
    154 	KASSERT(solocked(so));
    155 	KASSERT(pcb != NULL);
    156 	KASSERT(nam != NULL);
    157 
    158 	sa = mtod(nam, struct sockaddr_bt *);
    159 	nam->m_len = sizeof(struct sockaddr_bt);
    160 	return l2cap_sockaddr_pcb(pcb, sa);
    161 }
    162 
    163 /*
    164  * User Request.
    165  * up is socket
    166  * m is optional mbuf chain containing message
    167  * nam is either
    168  *	optional mbuf chain containing an address
    169  *	message flags (PRU_RCVD)
    170  * ctl is either
    171  *	optional mbuf chain containing socket options
    172  *	optional interface pointer PRU_PURGEIF
    173  * l is pointer to process requesting action (if any)
    174  *
    175  * we are responsible for disposing of m and ctl if
    176  * they are mbuf chains
    177  */
    178 static int
    179 l2cap_usrreq(struct socket *up, int req, struct mbuf *m,
    180     struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    181 {
    182 	struct l2cap_channel *pcb = up->so_pcb;
    183 	struct sockaddr_bt *sa;
    184 	struct mbuf *m0;
    185 	int err = 0;
    186 
    187 	DPRINTFN(2, "%s\n", prurequests[req]);
    188 	KASSERT(req != PRU_ATTACH);
    189 	KASSERT(req != PRU_DETACH);
    190 	KASSERT(req != PRU_CONTROL);
    191 	KASSERT(req != PRU_SENSE);
    192 	KASSERT(req != PRU_PEERADDR);
    193 	KASSERT(req != PRU_SOCKADDR);
    194 
    195 	switch (req) {
    196 	case PRU_PURGEIF:
    197 		return EOPNOTSUPP;
    198 	}
    199 
    200 	if (pcb == NULL) {
    201 		err = EINVAL;
    202 		goto release;
    203 	}
    204 
    205 	switch(req) {
    206 	case PRU_DISCONNECT:
    207 		soisdisconnecting(up);
    208 		return l2cap_disconnect(pcb, up->so_linger);
    209 
    210 	case PRU_ABORT:
    211 		l2cap_disconnect(pcb, 0);
    212 		soisdisconnected(up);
    213 		l2cap_detach(up);
    214 		return 0;
    215 
    216 	case PRU_BIND:
    217 		KASSERT(nam != NULL);
    218 		sa = mtod(nam, struct sockaddr_bt *);
    219 
    220 		if (sa->bt_len != sizeof(struct sockaddr_bt))
    221 			return EINVAL;
    222 
    223 		if (sa->bt_family != AF_BLUETOOTH)
    224 			return EAFNOSUPPORT;
    225 
    226 		return l2cap_bind(pcb, sa);
    227 
    228 	case PRU_CONNECT:
    229 		KASSERT(nam != NULL);
    230 		sa = mtod(nam, struct sockaddr_bt *);
    231 
    232 		if (sa->bt_len != sizeof(struct sockaddr_bt))
    233 			return EINVAL;
    234 
    235 		if (sa->bt_family != AF_BLUETOOTH)
    236 			return EAFNOSUPPORT;
    237 
    238 		soisconnecting(up);
    239 		return l2cap_connect(pcb, sa);
    240 
    241 	case PRU_SHUTDOWN:
    242 		socantsendmore(up);
    243 		break;
    244 
    245 	case PRU_SEND:
    246 		KASSERT(m != NULL);
    247 		if (m->m_pkthdr.len == 0)
    248 			break;
    249 
    250 		if (m->m_pkthdr.len > pcb->lc_omtu) {
    251 			err = EMSGSIZE;
    252 			break;
    253 		}
    254 
    255 		m0 = m_copypacket(m, M_DONTWAIT);
    256 		if (m0 == NULL) {
    257 			err = ENOMEM;
    258 			break;
    259 		}
    260 
    261 		if (ctl)	/* no use for that */
    262 			m_freem(ctl);
    263 
    264 		sbappendrecord(&up->so_snd, m);
    265 		return l2cap_send(pcb, m0);
    266 
    267 	case PRU_RCVD:
    268 	case PRU_RCVOOB:
    269 		return EOPNOTSUPP;	/* (no release) */
    270 
    271 	case PRU_LISTEN:
    272 		return l2cap_listen(pcb);
    273 
    274 	case PRU_ACCEPT:
    275 		KASSERT(nam != NULL);
    276 		sa = mtod(nam, struct sockaddr_bt *);
    277 		nam->m_len = sizeof(struct sockaddr_bt);
    278 		return l2cap_peeraddr_pcb(pcb, sa);
    279 
    280 	case PRU_CONNECT2:
    281 	case PRU_SENDOOB:
    282 	case PRU_FASTTIMO:
    283 	case PRU_SLOWTIMO:
    284 	case PRU_PROTORCV:
    285 	case PRU_PROTOSEND:
    286 		err = EOPNOTSUPP;
    287 		break;
    288 
    289 	default:
    290 		UNKNOWN(req);
    291 		err = EOPNOTSUPP;
    292 		break;
    293 	}
    294 
    295 release:
    296 	if (m) m_freem(m);
    297 	if (ctl) m_freem(ctl);
    298 	return err;
    299 }
    300 
    301 /*
    302  * l2cap_ctloutput(req, socket, sockopt)
    303  *
    304  *	Apply configuration commands to channel. This corresponds to
    305  *	"Reconfigure Channel Request" in the L2CAP specification.
    306  */
    307 int
    308 l2cap_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    309 {
    310 	struct l2cap_channel *pcb = so->so_pcb;
    311 	int err = 0;
    312 
    313 	DPRINTFN(2, "%s\n", prcorequests[req]);
    314 
    315 	if (pcb == NULL)
    316 		return EINVAL;
    317 
    318 	if (sopt->sopt_level != BTPROTO_L2CAP)
    319 		return ENOPROTOOPT;
    320 
    321 	switch(req) {
    322 	case PRCO_GETOPT:
    323 		err = l2cap_getopt(pcb, sopt);
    324 		break;
    325 
    326 	case PRCO_SETOPT:
    327 		err = l2cap_setopt(pcb, sopt);
    328 		break;
    329 
    330 	default:
    331 		err = ENOPROTOOPT;
    332 		break;
    333 	}
    334 
    335 	return err;
    336 }
    337 
    338 /**********************************************************************
    339  *
    340  *	L2CAP Protocol socket callbacks
    341  *
    342  */
    343 
    344 static void
    345 l2cap_connecting(void *arg)
    346 {
    347 	struct socket *so = arg;
    348 
    349 	DPRINTF("Connecting\n");
    350 	soisconnecting(so);
    351 }
    352 
    353 static void
    354 l2cap_connected(void *arg)
    355 {
    356 	struct socket *so = arg;
    357 
    358 	DPRINTF("Connected\n");
    359 	soisconnected(so);
    360 }
    361 
    362 static void
    363 l2cap_disconnected(void *arg, int err)
    364 {
    365 	struct socket *so = arg;
    366 
    367 	DPRINTF("Disconnected (%d)\n", err);
    368 
    369 	so->so_error = err;
    370 	soisdisconnected(so);
    371 }
    372 
    373 static void *
    374 l2cap_newconn(void *arg, struct sockaddr_bt *laddr,
    375     struct sockaddr_bt *raddr)
    376 {
    377 	struct socket *so = arg;
    378 
    379 	DPRINTF("New Connection\n");
    380 	so = sonewconn(so, false);
    381 	if (so == NULL)
    382 		return NULL;
    383 
    384 	soisconnecting(so);
    385 
    386 	return so->so_pcb;
    387 }
    388 
    389 static void
    390 l2cap_complete(void *arg, int count)
    391 {
    392 	struct socket *so = arg;
    393 
    394 	while (count-- > 0)
    395 		sbdroprecord(&so->so_snd);
    396 
    397 	sowwakeup(so);
    398 }
    399 
    400 static void
    401 l2cap_linkmode(void *arg, int new)
    402 {
    403 	struct socket *so = arg;
    404 	struct sockopt sopt;
    405 	int mode;
    406 
    407 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    408 		(new & L2CAP_LM_AUTH ? "on" : "off"),
    409 		(new & L2CAP_LM_ENCRYPT ? "on" : "off"),
    410 		(new & L2CAP_LM_SECURE ? "on" : "off"));
    411 
    412 	sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0);
    413 	(void)l2cap_getopt(so->so_pcb, &sopt);
    414 	(void)sockopt_getint(&sopt, &mode);
    415 	sockopt_destroy(&sopt);
    416 
    417 	if (((mode & L2CAP_LM_AUTH) && !(new & L2CAP_LM_AUTH))
    418 	    || ((mode & L2CAP_LM_ENCRYPT) && !(new & L2CAP_LM_ENCRYPT))
    419 	    || ((mode & L2CAP_LM_SECURE) && !(new & L2CAP_LM_SECURE)))
    420 		l2cap_disconnect(so->so_pcb, 0);
    421 }
    422 
    423 static void
    424 l2cap_input(void *arg, struct mbuf *m)
    425 {
    426 	struct socket *so = arg;
    427 
    428 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    429 		printf("%s: packet (%d bytes) dropped (socket buffer full)\n",
    430 			__func__, m->m_pkthdr.len);
    431 		m_freem(m);
    432 		return;
    433 	}
    434 
    435 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    436 
    437 	sbappendrecord(&so->so_rcv, m);
    438 	sorwakeup(so);
    439 }
    440 
    441 PR_WRAP_USRREQS(l2cap)
    442 
    443 #define	l2cap_attach		l2cap_attach_wrapper
    444 #define	l2cap_detach		l2cap_detach_wrapper
    445 #define	l2cap_ioctl		l2cap_ioctl_wrapper
    446 #define	l2cap_stat		l2cap_stat_wrapper
    447 #define	l2cap_peeraddr		l2cap_peeraddr_wrapper
    448 #define	l2cap_sockaddr		l2cap_sockaddr_wrapper
    449 #define	l2cap_usrreq		l2cap_usrreq_wrapper
    450 
    451 const struct pr_usrreqs l2cap_usrreqs = {
    452 	.pr_attach	= l2cap_attach,
    453 	.pr_detach	= l2cap_detach,
    454 	.pr_ioctl	= l2cap_ioctl,
    455 	.pr_stat	= l2cap_stat,
    456 	.pr_peeraddr	= l2cap_peeraddr,
    457 	.pr_sockaddr	= l2cap_sockaddr,
    458 	.pr_generic	= l2cap_usrreq,
    459 };
    460