rfcomm_socket.c revision 1.23 
1/*	$NetBSD: rfcomm_socket.c,v 1.23 2014/07/09 04:54:03 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 1.23 2014/07/09 04:54:03 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 *so, u_long cmd, void *nam, struct ifnet *ifp)
129{
130	return EPASSTHROUGH;
131}
132
133static int
134rfcomm_stat(struct socket *so, struct stat *ub)
135{
136	KASSERT(solocked(so));
137
138	return 0;
139}
140
141static int
142rfcomm_peeraddr(struct socket *so, struct mbuf *nam)
143{
144	struct rfcomm_dlc *pcb = so->so_pcb;
145	struct sockaddr_bt *sa;
146
147	KASSERT(solocked(so));
148	KASSERT(pcb != NULL);
149	KASSERT(nam != NULL);
150
151	sa = mtod(nam, struct sockaddr_bt *);
152	nam->m_len = sizeof(struct sockaddr_bt);
153	return rfcomm_peeraddr_pcb(pcb, sa);
154}
155
156static int
157rfcomm_sockaddr(struct socket *so, struct mbuf *nam)
158{
159	struct rfcomm_dlc *pcb = so->so_pcb;
160	struct sockaddr_bt *sa;
161
162	KASSERT(solocked(so));
163	KASSERT(pcb != NULL);
164	KASSERT(nam != NULL);
165
166	sa = mtod(nam, struct sockaddr_bt *);
167	nam->m_len = sizeof(struct sockaddr_bt);
168	return rfcomm_sockaddr_pcb(pcb, sa);
169}
170
171/*
172 * User Request.
173 * up is socket
174 * m is optional mbuf chain containing message
175 * nam is either
176 *	optional mbuf chain containing an address
177 *	message flags (PRU_RCVD)
178 * ctl is either
179 *	optional mbuf chain containing socket options
180 *	optional interface pointer PRU_PURGEIF
181 * l is pointer to process requesting action (if any)
182 *
183 * we are responsible for disposing of m and ctl if
184 * they are mbuf chains
185 */
186static int
187rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
188		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
189{
190	struct rfcomm_dlc *pcb = up->so_pcb;
191	struct sockaddr_bt *sa;
192	struct mbuf *m0;
193	int err = 0;
194
195	DPRINTFN(2, "%s\n", prurequests[req]);
196	KASSERT(req != PRU_ATTACH);
197	KASSERT(req != PRU_DETACH);
198	KASSERT(req != PRU_CONTROL);
199	KASSERT(req != PRU_SENSE);
200	KASSERT(req != PRU_PEERADDR);
201	KASSERT(req != PRU_SOCKADDR);
202
203	switch (req) {
204	case PRU_PURGEIF:
205		return EOPNOTSUPP;
206	}
207	if (pcb == NULL) {
208		err = EINVAL;
209		goto release;
210	}
211
212	switch(req) {
213	case PRU_DISCONNECT:
214		soisdisconnecting(up);
215		return rfcomm_disconnect(pcb, up->so_linger);
216
217	case PRU_ABORT:
218		rfcomm_disconnect(pcb, 0);
219		soisdisconnected(up);
220		rfcomm_detach(up);
221		return 0;
222
223	case PRU_BIND:
224		KASSERT(nam != NULL);
225		sa = mtod(nam, struct sockaddr_bt *);
226
227		if (sa->bt_len != sizeof(struct sockaddr_bt))
228			return EINVAL;
229
230		if (sa->bt_family != AF_BLUETOOTH)
231			return EAFNOSUPPORT;
232
233		return rfcomm_bind(pcb, sa);
234
235	case PRU_CONNECT:
236		KASSERT(nam != NULL);
237		sa = mtod(nam, struct sockaddr_bt *);
238
239		if (sa->bt_len != sizeof(struct sockaddr_bt))
240			return EINVAL;
241
242		if (sa->bt_family != AF_BLUETOOTH)
243			return EAFNOSUPPORT;
244
245		soisconnecting(up);
246		return rfcomm_connect(pcb, sa);
247
248	case PRU_SHUTDOWN:
249		socantsendmore(up);
250		break;
251
252	case PRU_SEND:
253		KASSERT(m != NULL);
254
255		if (ctl)	/* no use for that */
256			m_freem(ctl);
257
258		m0 = m_copypacket(m, M_DONTWAIT);
259		if (m0 == NULL)
260			return ENOMEM;
261
262		sbappendstream(&up->so_snd, m);
263
264		return rfcomm_send(pcb, m0);
265
266	case PRU_RCVD:
267		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
268
269	case PRU_RCVOOB:
270		return EOPNOTSUPP;	/* (no release) */
271
272	case PRU_LISTEN:
273		return rfcomm_listen(pcb);
274
275	case PRU_ACCEPT:
276		KASSERT(nam != NULL);
277		sa = mtod(nam, struct sockaddr_bt *);
278		nam->m_len = sizeof(struct sockaddr_bt);
279		return rfcomm_peeraddr_pcb(pcb, sa);
280
281	case PRU_CONNECT2:
282	case PRU_SENDOOB:
283	case PRU_FASTTIMO:
284	case PRU_SLOWTIMO:
285	case PRU_PROTORCV:
286	case PRU_PROTOSEND:
287		err = EOPNOTSUPP;
288		break;
289
290	default:
291		UNKNOWN(req);
292		err = EOPNOTSUPP;
293		break;
294	}
295
296release:
297	if (m) m_freem(m);
298	if (ctl) m_freem(ctl);
299	return err;
300}
301
302/*
303 * rfcomm_ctloutput(req, socket, sockopt)
304 *
305 */
306int
307rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
308{
309	struct rfcomm_dlc *pcb = so->so_pcb;
310	int err = 0;
311
312	DPRINTFN(2, "%s\n", prcorequests[req]);
313
314	if (pcb == NULL)
315		return EINVAL;
316
317	if (sopt->sopt_level != BTPROTO_RFCOMM)
318		return ENOPROTOOPT;
319
320	switch(req) {
321	case PRCO_GETOPT:
322		err = rfcomm_getopt(pcb, sopt);
323		break;
324
325	case PRCO_SETOPT:
326		err = rfcomm_setopt(pcb, sopt);
327		break;
328
329	default:
330		err = ENOPROTOOPT;
331		break;
332	}
333
334	return err;
335}
336
337/**********************************************************************
338 *
339 * RFCOMM callbacks
340 */
341
342static void
343rfcomm_connecting(void *arg)
344{
345	/* struct socket *so = arg; */
346
347	KASSERT(arg != NULL);
348	DPRINTF("Connecting\n");
349}
350
351static void
352rfcomm_connected(void *arg)
353{
354	struct socket *so = arg;
355
356	KASSERT(so != NULL);
357	DPRINTF("Connected\n");
358	soisconnected(so);
359}
360
361static void
362rfcomm_disconnected(void *arg, int err)
363{
364	struct socket *so = arg;
365
366	KASSERT(so != NULL);
367	DPRINTF("Disconnected\n");
368
369	so->so_error = err;
370	soisdisconnected(so);
371}
372
373static void *
374rfcomm_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/*
390 * rfcomm_complete(rfcomm_dlc, length)
391 *
392 * length bytes are sent and may be removed from socket buffer
393 */
394static void
395rfcomm_complete(void *arg, int length)
396{
397	struct socket *so = arg;
398
399	sbdrop(&so->so_snd, length);
400	sowwakeup(so);
401}
402
403/*
404 * rfcomm_linkmode(rfcomm_dlc, new)
405 *
406 * link mode change notification.
407 */
408static void
409rfcomm_linkmode(void *arg, int new)
410{
411	struct socket *so = arg;
412	struct sockopt sopt;
413	int mode;
414
415	DPRINTF("auth %s, encrypt %s, secure %s\n",
416		(new & RFCOMM_LM_AUTH ? "on" : "off"),
417		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
418		(new & RFCOMM_LM_SECURE ? "on" : "off"));
419
420	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
421	(void)rfcomm_getopt(so->so_pcb, &sopt);
422	(void)sockopt_getint(&sopt, &mode);
423	sockopt_destroy(&sopt);
424
425	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
426	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
427	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
428		rfcomm_disconnect(so->so_pcb, 0);
429}
430
431/*
432 * rfcomm_input(rfcomm_dlc, mbuf)
433 */
434static void
435rfcomm_input(void *arg, struct mbuf *m)
436{
437	struct socket *so = arg;
438
439	KASSERT(so != NULL);
440
441	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
442		printf("%s: %d bytes dropped (socket buffer full)\n",
443			__func__, m->m_pkthdr.len);
444		m_freem(m);
445		return;
446	}
447
448	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
449
450	sbappendstream(&so->so_rcv, m);
451	sorwakeup(so);
452}
453
454PR_WRAP_USRREQS(rfcomm)
455
456#define	rfcomm_attach		rfcomm_attach_wrapper
457#define	rfcomm_detach		rfcomm_detach_wrapper
458#define	rfcomm_ioctl		rfcomm_ioctl_wrapper
459#define	rfcomm_stat		rfcomm_stat_wrapper
460#define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
461#define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
462#define	rfcomm_usrreq		rfcomm_usrreq_wrapper
463
464const struct pr_usrreqs rfcomm_usrreqs = {
465	.pr_attach	= rfcomm_attach,
466	.pr_detach	= rfcomm_detach,
467	.pr_ioctl	= rfcomm_ioctl,
468	.pr_stat	= rfcomm_stat,
469	.pr_peeraddr	= rfcomm_peeraddr,
470	.pr_sockaddr	= rfcomm_sockaddr,
471	.pr_generic	= rfcomm_usrreq,
472};
473