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l2cap_socket.c revision 1.19 
      1 /*	$NetBSD: l2cap_socket.c,v 1.19 2014/07/07 07:09:58 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 1.19 2014/07/07 07:09:58 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 *up, 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 	return EOPNOTSUPP;
    129 }
    130 
    131 /*
    132  * User Request.
    133  * up is socket
    134  * m is optional mbuf chain containing message
    135  * nam is either
    136  *	optional mbuf chain containing an address
    137  *	message flags (PRU_RCVD)
    138  * ctl is either
    139  *	optional mbuf chain containing socket options
    140  *	optional interface pointer PRU_PURGEIF
    141  * l is pointer to process requesting action (if any)
    142  *
    143  * we are responsible for disposing of m and ctl if
    144  * they are mbuf chains
    145  */
    146 static int
    147 l2cap_usrreq(struct socket *up, int req, struct mbuf *m,
    148     struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
    149 {
    150 	struct l2cap_channel *pcb = up->so_pcb;
    151 	struct sockaddr_bt *sa;
    152 	struct mbuf *m0;
    153 	int err = 0;
    154 
    155 	DPRINTFN(2, "%s\n", prurequests[req]);
    156 	KASSERT(req != PRU_ATTACH);
    157 	KASSERT(req != PRU_DETACH);
    158 	KASSERT(req != PRU_CONTROL);
    159 	KASSERT(req != PRU_SENSE);
    160 
    161 	switch (req) {
    162 	case PRU_PURGEIF:
    163 		return EOPNOTSUPP;
    164 	}
    165 
    166 	if (pcb == NULL) {
    167 		err = EINVAL;
    168 		goto release;
    169 	}
    170 
    171 	switch(req) {
    172 	case PRU_DISCONNECT:
    173 		soisdisconnecting(up);
    174 		return l2cap_disconnect(pcb, up->so_linger);
    175 
    176 	case PRU_ABORT:
    177 		l2cap_disconnect(pcb, 0);
    178 		soisdisconnected(up);
    179 		l2cap_detach(up);
    180 		return 0;
    181 
    182 	case PRU_BIND:
    183 		KASSERT(nam != NULL);
    184 		sa = mtod(nam, struct sockaddr_bt *);
    185 
    186 		if (sa->bt_len != sizeof(struct sockaddr_bt))
    187 			return EINVAL;
    188 
    189 		if (sa->bt_family != AF_BLUETOOTH)
    190 			return EAFNOSUPPORT;
    191 
    192 		return l2cap_bind(pcb, sa);
    193 
    194 	case PRU_CONNECT:
    195 		KASSERT(nam != NULL);
    196 		sa = mtod(nam, struct sockaddr_bt *);
    197 
    198 		if (sa->bt_len != sizeof(struct sockaddr_bt))
    199 			return EINVAL;
    200 
    201 		if (sa->bt_family != AF_BLUETOOTH)
    202 			return EAFNOSUPPORT;
    203 
    204 		soisconnecting(up);
    205 		return l2cap_connect(pcb, sa);
    206 
    207 	case PRU_PEERADDR:
    208 		KASSERT(nam != NULL);
    209 		sa = mtod(nam, struct sockaddr_bt *);
    210 		nam->m_len = sizeof(struct sockaddr_bt);
    211 		return l2cap_peeraddr(pcb, sa);
    212 
    213 	case PRU_SOCKADDR:
    214 		KASSERT(nam != NULL);
    215 		sa = mtod(nam, struct sockaddr_bt *);
    216 		nam->m_len = sizeof(struct sockaddr_bt);
    217 		return l2cap_sockaddr(pcb, sa);
    218 
    219 	case PRU_SHUTDOWN:
    220 		socantsendmore(up);
    221 		break;
    222 
    223 	case PRU_SEND:
    224 		KASSERT(m != NULL);
    225 		if (m->m_pkthdr.len == 0)
    226 			break;
    227 
    228 		if (m->m_pkthdr.len > pcb->lc_omtu) {
    229 			err = EMSGSIZE;
    230 			break;
    231 		}
    232 
    233 		m0 = m_copypacket(m, M_DONTWAIT);
    234 		if (m0 == NULL) {
    235 			err = ENOMEM;
    236 			break;
    237 		}
    238 
    239 		if (ctl)	/* no use for that */
    240 			m_freem(ctl);
    241 
    242 		sbappendrecord(&up->so_snd, m);
    243 		return l2cap_send(pcb, m0);
    244 
    245 	case PRU_RCVD:
    246 	case PRU_RCVOOB:
    247 		return EOPNOTSUPP;	/* (no release) */
    248 
    249 	case PRU_LISTEN:
    250 		return l2cap_listen(pcb);
    251 
    252 	case PRU_ACCEPT:
    253 		KASSERT(nam != NULL);
    254 		sa = mtod(nam, struct sockaddr_bt *);
    255 		nam->m_len = sizeof(struct sockaddr_bt);
    256 		return l2cap_peeraddr(pcb, sa);
    257 
    258 	case PRU_CONNECT2:
    259 	case PRU_SENDOOB:
    260 	case PRU_FASTTIMO:
    261 	case PRU_SLOWTIMO:
    262 	case PRU_PROTORCV:
    263 	case PRU_PROTOSEND:
    264 		err = EOPNOTSUPP;
    265 		break;
    266 
    267 	default:
    268 		UNKNOWN(req);
    269 		err = EOPNOTSUPP;
    270 		break;
    271 	}
    272 
    273 release:
    274 	if (m) m_freem(m);
    275 	if (ctl) m_freem(ctl);
    276 	return err;
    277 }
    278 
    279 /*
    280  * l2cap_ctloutput(req, socket, sockopt)
    281  *
    282  *	Apply configuration commands to channel. This corresponds to
    283  *	"Reconfigure Channel Request" in the L2CAP specification.
    284  */
    285 int
    286 l2cap_ctloutput(int req, struct socket *so, struct sockopt *sopt)
    287 {
    288 	struct l2cap_channel *pcb = so->so_pcb;
    289 	int err = 0;
    290 
    291 	DPRINTFN(2, "%s\n", prcorequests[req]);
    292 
    293 	if (pcb == NULL)
    294 		return EINVAL;
    295 
    296 	if (sopt->sopt_level != BTPROTO_L2CAP)
    297 		return ENOPROTOOPT;
    298 
    299 	switch(req) {
    300 	case PRCO_GETOPT:
    301 		err = l2cap_getopt(pcb, sopt);
    302 		break;
    303 
    304 	case PRCO_SETOPT:
    305 		err = l2cap_setopt(pcb, sopt);
    306 		break;
    307 
    308 	default:
    309 		err = ENOPROTOOPT;
    310 		break;
    311 	}
    312 
    313 	return err;
    314 }
    315 
    316 /**********************************************************************
    317  *
    318  *	L2CAP Protocol socket callbacks
    319  *
    320  */
    321 
    322 static void
    323 l2cap_connecting(void *arg)
    324 {
    325 	struct socket *so = arg;
    326 
    327 	DPRINTF("Connecting\n");
    328 	soisconnecting(so);
    329 }
    330 
    331 static void
    332 l2cap_connected(void *arg)
    333 {
    334 	struct socket *so = arg;
    335 
    336 	DPRINTF("Connected\n");
    337 	soisconnected(so);
    338 }
    339 
    340 static void
    341 l2cap_disconnected(void *arg, int err)
    342 {
    343 	struct socket *so = arg;
    344 
    345 	DPRINTF("Disconnected (%d)\n", err);
    346 
    347 	so->so_error = err;
    348 	soisdisconnected(so);
    349 }
    350 
    351 static void *
    352 l2cap_newconn(void *arg, struct sockaddr_bt *laddr,
    353     struct sockaddr_bt *raddr)
    354 {
    355 	struct socket *so = arg;
    356 
    357 	DPRINTF("New Connection\n");
    358 	so = sonewconn(so, false);
    359 	if (so == NULL)
    360 		return NULL;
    361 
    362 	soisconnecting(so);
    363 
    364 	return so->so_pcb;
    365 }
    366 
    367 static void
    368 l2cap_complete(void *arg, int count)
    369 {
    370 	struct socket *so = arg;
    371 
    372 	while (count-- > 0)
    373 		sbdroprecord(&so->so_snd);
    374 
    375 	sowwakeup(so);
    376 }
    377 
    378 static void
    379 l2cap_linkmode(void *arg, int new)
    380 {
    381 	struct socket *so = arg;
    382 	struct sockopt sopt;
    383 	int mode;
    384 
    385 	DPRINTF("auth %s, encrypt %s, secure %s\n",
    386 		(new & L2CAP_LM_AUTH ? "on" : "off"),
    387 		(new & L2CAP_LM_ENCRYPT ? "on" : "off"),
    388 		(new & L2CAP_LM_SECURE ? "on" : "off"));
    389 
    390 	sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0);
    391 	(void)l2cap_getopt(so->so_pcb, &sopt);
    392 	(void)sockopt_getint(&sopt, &mode);
    393 	sockopt_destroy(&sopt);
    394 
    395 	if (((mode & L2CAP_LM_AUTH) && !(new & L2CAP_LM_AUTH))
    396 	    || ((mode & L2CAP_LM_ENCRYPT) && !(new & L2CAP_LM_ENCRYPT))
    397 	    || ((mode & L2CAP_LM_SECURE) && !(new & L2CAP_LM_SECURE)))
    398 		l2cap_disconnect(so->so_pcb, 0);
    399 }
    400 
    401 static void
    402 l2cap_input(void *arg, struct mbuf *m)
    403 {
    404 	struct socket *so = arg;
    405 
    406 	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
    407 		printf("%s: packet (%d bytes) dropped (socket buffer full)\n",
    408 			__func__, m->m_pkthdr.len);
    409 		m_freem(m);
    410 		return;
    411 	}
    412 
    413 	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
    414 
    415 	sbappendrecord(&so->so_rcv, m);
    416 	sorwakeup(so);
    417 }
    418 
    419 PR_WRAP_USRREQS(l2cap)
    420 
    421 #define	l2cap_attach		l2cap_attach_wrapper
    422 #define	l2cap_detach		l2cap_detach_wrapper
    423 #define	l2cap_ioctl		l2cap_ioctl_wrapper
    424 #define	l2cap_stat		l2cap_stat_wrapper
    425 #define	l2cap_usrreq		l2cap_usrreq_wrapper
    426 
    427 const struct pr_usrreqs l2cap_usrreqs = {
    428 	.pr_attach	= l2cap_attach,
    429 	.pr_detach	= l2cap_detach,
    430 	.pr_ioctl	= l2cap_ioctl,
    431 	.pr_stat	= l2cap_stat,
    432 	.pr_generic	= l2cap_usrreq,
    433 };
    434