rfcomm_socket.c revision 1.17 
1/*	$NetBSD: rfcomm_socket.c,v 1.17 2014/06/22 08:10:18 rtr 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 1.17 2014/06/22 08:10:18 rtr 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
62static void rfcomm_connecting(void *);
63static void rfcomm_connected(void *);
64static void rfcomm_disconnected(void *, int);
65static void *rfcomm_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
66static void rfcomm_complete(void *, int);
67static void rfcomm_linkmode(void *, int);
68static void rfcomm_input(void *, struct mbuf *);
69
70static 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 */
81int rfcomm_sendspace = 4096;
82int rfcomm_recvspace = 4096;
83
84static int
85rfcomm_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(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
119static void
120rfcomm_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
127static int
128rfcomm_ioctl(struct socket *up, struct mbuf *m,
129		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
130{
131	return EPASSTHROUGH;
132}
133
134/*
135 * User Request.
136 * up is socket
137 * m is optional mbuf chain containing message
138 * nam is either
139 *	optional mbuf chain containing an address
140 *	message flags (PRU_RCVD)
141 * ctl is either
142 *	optional mbuf chain containing socket options
143 *	optional interface pointer PRU_PURGEIF
144 * l is pointer to process requesting action (if any)
145 *
146 * we are responsible for disposing of m and ctl if
147 * they are mbuf chains
148 */
149static int
150rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
151		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
152{
153	struct rfcomm_dlc *pcb = up->so_pcb;
154	struct sockaddr_bt *sa;
155	struct mbuf *m0;
156	int err = 0;
157
158	DPRINTFN(2, "%s\n", prurequests[req]);
159	KASSERT(req != PRU_ATTACH);
160	KASSERT(req != PRU_DETACH);
161	KASSERT(req != PRU_CONTROL);
162
163	switch (req) {
164	case PRU_PURGEIF:
165		return EOPNOTSUPP;
166	}
167	if (pcb == NULL) {
168		err = EINVAL;
169		goto release;
170	}
171
172	switch(req) {
173	case PRU_DISCONNECT:
174		soisdisconnecting(up);
175		return rfcomm_disconnect(pcb, up->so_linger);
176
177	case PRU_ABORT:
178		rfcomm_disconnect(pcb, 0);
179		soisdisconnected(up);
180		rfcomm_detach(up);
181		return 0;
182
183	case PRU_BIND:
184		KASSERT(nam != NULL);
185		sa = mtod(nam, struct sockaddr_bt *);
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		return rfcomm_bind(pcb, sa);
194
195	case PRU_CONNECT:
196		KASSERT(nam != NULL);
197		sa = mtod(nam, struct sockaddr_bt *);
198
199		if (sa->bt_len != sizeof(struct sockaddr_bt))
200			return EINVAL;
201
202		if (sa->bt_family != AF_BLUETOOTH)
203			return EAFNOSUPPORT;
204
205		soisconnecting(up);
206		return rfcomm_connect(pcb, sa);
207
208	case PRU_PEERADDR:
209		KASSERT(nam != NULL);
210		sa = mtod(nam, struct sockaddr_bt *);
211		nam->m_len = sizeof(struct sockaddr_bt);
212		return rfcomm_peeraddr(pcb, sa);
213
214	case PRU_SOCKADDR:
215		KASSERT(nam != NULL);
216		sa = mtod(nam, struct sockaddr_bt *);
217		nam->m_len = sizeof(struct sockaddr_bt);
218		return rfcomm_sockaddr(pcb, sa);
219
220	case PRU_SHUTDOWN:
221		socantsendmore(up);
222		break;
223
224	case PRU_SEND:
225		KASSERT(m != NULL);
226
227		if (ctl)	/* no use for that */
228			m_freem(ctl);
229
230		m0 = m_copypacket(m, M_DONTWAIT);
231		if (m0 == NULL)
232			return ENOMEM;
233
234		sbappendstream(&up->so_snd, m);
235
236		return rfcomm_send(pcb, m0);
237
238	case PRU_SENSE:
239		return 0;		/* (no release) */
240
241	case PRU_RCVD:
242		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
243
244	case PRU_RCVOOB:
245		return EOPNOTSUPP;	/* (no release) */
246
247	case PRU_LISTEN:
248		return rfcomm_listen(pcb);
249
250	case PRU_ACCEPT:
251		KASSERT(nam != NULL);
252		sa = mtod(nam, struct sockaddr_bt *);
253		nam->m_len = sizeof(struct sockaddr_bt);
254		return rfcomm_peeraddr(pcb, sa);
255
256	case PRU_CONNECT2:
257	case PRU_SENDOOB:
258	case PRU_FASTTIMO:
259	case PRU_SLOWTIMO:
260	case PRU_PROTORCV:
261	case PRU_PROTOSEND:
262		err = EOPNOTSUPP;
263		break;
264
265	default:
266		UNKNOWN(req);
267		err = EOPNOTSUPP;
268		break;
269	}
270
271release:
272	if (m) m_freem(m);
273	if (ctl) m_freem(ctl);
274	return err;
275}
276
277/*
278 * rfcomm_ctloutput(req, socket, sockopt)
279 *
280 */
281int
282rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
283{
284	struct rfcomm_dlc *pcb = so->so_pcb;
285	int err = 0;
286
287	DPRINTFN(2, "%s\n", prcorequests[req]);
288
289	if (pcb == NULL)
290		return EINVAL;
291
292	if (sopt->sopt_level != BTPROTO_RFCOMM)
293		return ENOPROTOOPT;
294
295	switch(req) {
296	case PRCO_GETOPT:
297		err = rfcomm_getopt(pcb, sopt);
298		break;
299
300	case PRCO_SETOPT:
301		err = rfcomm_setopt(pcb, sopt);
302		break;
303
304	default:
305		err = ENOPROTOOPT;
306		break;
307	}
308
309	return err;
310}
311
312/**********************************************************************
313 *
314 * RFCOMM callbacks
315 */
316
317static void
318rfcomm_connecting(void *arg)
319{
320	/* struct socket *so = arg; */
321
322	KASSERT(arg != NULL);
323	DPRINTF("Connecting\n");
324}
325
326static void
327rfcomm_connected(void *arg)
328{
329	struct socket *so = arg;
330
331	KASSERT(so != NULL);
332	DPRINTF("Connected\n");
333	soisconnected(so);
334}
335
336static void
337rfcomm_disconnected(void *arg, int err)
338{
339	struct socket *so = arg;
340
341	KASSERT(so != NULL);
342	DPRINTF("Disconnected\n");
343
344	so->so_error = err;
345	soisdisconnected(so);
346}
347
348static void *
349rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
350    struct sockaddr_bt *raddr)
351{
352	struct socket *so = arg;
353
354	DPRINTF("New Connection\n");
355	so = sonewconn(so, false);
356	if (so == NULL)
357		return NULL;
358
359	soisconnecting(so);
360
361	return so->so_pcb;
362}
363
364/*
365 * rfcomm_complete(rfcomm_dlc, length)
366 *
367 * length bytes are sent and may be removed from socket buffer
368 */
369static void
370rfcomm_complete(void *arg, int length)
371{
372	struct socket *so = arg;
373
374	sbdrop(&so->so_snd, length);
375	sowwakeup(so);
376}
377
378/*
379 * rfcomm_linkmode(rfcomm_dlc, new)
380 *
381 * link mode change notification.
382 */
383static void
384rfcomm_linkmode(void *arg, int new)
385{
386	struct socket *so = arg;
387	struct sockopt sopt;
388	int mode;
389
390	DPRINTF("auth %s, encrypt %s, secure %s\n",
391		(new & RFCOMM_LM_AUTH ? "on" : "off"),
392		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
393		(new & RFCOMM_LM_SECURE ? "on" : "off"));
394
395	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
396	(void)rfcomm_getopt(so->so_pcb, &sopt);
397	(void)sockopt_getint(&sopt, &mode);
398	sockopt_destroy(&sopt);
399
400	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
401	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
402	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
403		rfcomm_disconnect(so->so_pcb, 0);
404}
405
406/*
407 * rfcomm_input(rfcomm_dlc, mbuf)
408 */
409static void
410rfcomm_input(void *arg, struct mbuf *m)
411{
412	struct socket *so = arg;
413
414	KASSERT(so != NULL);
415
416	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
417		printf("%s: %d bytes dropped (socket buffer full)\n",
418			__func__, m->m_pkthdr.len);
419		m_freem(m);
420		return;
421	}
422
423	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
424
425	sbappendstream(&so->so_rcv, m);
426	sorwakeup(so);
427}
428
429PR_WRAP_USRREQS(rfcomm)
430
431#define	rfcomm_attach		rfcomm_attach_wrapper
432#define	rfcomm_detach		rfcomm_detach_wrapper
433#define	rfcomm_ioctl		rfcomm_ioctl_wrapper
434#define	rfcomm_usrreq		rfcomm_usrreq_wrapper
435
436const struct pr_usrreqs rfcomm_usrreqs = {
437	.pr_attach	= rfcomm_attach,
438	.pr_detach	= rfcomm_detach,
439	.pr_ioctl	= rfcomm_ioctl,
440	.pr_generic	= rfcomm_usrreq,
441};
442