rfcomm_socket.c revision 1.38 
1/*	$NetBSD: rfcomm_socket.c,v 1.38 2019/01/28 12:53:01 martin 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 1.38 2019/01/28 12:53:01 martin 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_pcb(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_accept(struct socket *so, struct sockaddr *nam)
129{
130	struct rfcomm_dlc *pcb = so->so_pcb;
131
132	KASSERT(solocked(so));
133	KASSERT(nam != NULL);
134
135	if (pcb == NULL)
136		return EINVAL;
137
138	return rfcomm_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
139}
140
141static int
142rfcomm_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
143{
144	struct rfcomm_dlc *pcb = so->so_pcb;
145	struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
146
147	KASSERT(solocked(so));
148	KASSERT(nam != NULL);
149
150	if (pcb == NULL)
151		return EINVAL;
152
153	if (sa->bt_len != sizeof(struct sockaddr_bt))
154		return EINVAL;
155
156	if (sa->bt_family != AF_BLUETOOTH)
157		return EAFNOSUPPORT;
158
159	return rfcomm_bind_pcb(pcb, sa);
160}
161
162static int
163rfcomm_listen(struct socket *so, struct lwp *l)
164{
165	struct rfcomm_dlc *pcb = so->so_pcb;
166
167	KASSERT(solocked(so));
168
169	if (pcb == NULL)
170		return EINVAL;
171
172	return rfcomm_listen_pcb(pcb);
173}
174
175static int
176rfcomm_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
177{
178	struct rfcomm_dlc *pcb = so->so_pcb;
179	struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
180
181	KASSERT(solocked(so));
182	KASSERT(nam != NULL);
183
184	if (pcb == NULL)
185		return EINVAL;
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	soisconnecting(so);
194	return rfcomm_connect_pcb(pcb, sa);
195}
196
197static int
198rfcomm_connect2(struct socket *so, struct socket *so2)
199{
200	struct rfcomm_dlc *pcb = so->so_pcb;
201
202	KASSERT(solocked(so));
203
204	if (pcb == NULL)
205		return EINVAL;
206
207	return EOPNOTSUPP;
208}
209
210static int
211rfcomm_disconnect(struct socket *so)
212{
213	struct rfcomm_dlc *pcb = so->so_pcb;
214
215	KASSERT(solocked(so));
216
217	if (pcb == NULL)
218		return EINVAL;
219
220	soisdisconnecting(so);
221	return rfcomm_disconnect_pcb(pcb, so->so_linger);
222}
223
224static int
225rfcomm_shutdown(struct socket *so)
226{
227	KASSERT(solocked(so));
228
229	socantsendmore(so);
230	return 0;
231}
232
233static int
234rfcomm_abort(struct socket *so)
235{
236	struct rfcomm_dlc *pcb = so->so_pcb;
237
238	KASSERT(solocked(so));
239
240	if (pcb == NULL)
241		return EINVAL;
242
243	rfcomm_disconnect_pcb(pcb, 0);
244	soisdisconnected(so);
245	rfcomm_detach(so);
246	return 0;
247}
248
249static int
250rfcomm_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
251{
252	return EPASSTHROUGH;
253}
254
255static int
256rfcomm_stat(struct socket *so, struct stat *ub)
257{
258	KASSERT(solocked(so));
259
260	return 0;
261}
262
263static int
264rfcomm_peeraddr(struct socket *so, struct sockaddr *nam)
265{
266	struct rfcomm_dlc *pcb = so->so_pcb;
267
268	KASSERT(solocked(so));
269	KASSERT(pcb != NULL);
270	KASSERT(nam != NULL);
271
272	return rfcomm_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
273}
274
275static int
276rfcomm_sockaddr(struct socket *so, struct sockaddr *nam)
277{
278	struct rfcomm_dlc *pcb = so->so_pcb;
279
280	KASSERT(solocked(so));
281	KASSERT(pcb != NULL);
282	KASSERT(nam != NULL);
283
284	return rfcomm_sockaddr_pcb(pcb, (struct sockaddr_bt *)nam);
285}
286
287static int
288rfcomm_rcvd(struct socket *so, int flags, struct lwp *l)
289{
290	struct rfcomm_dlc *pcb = so->so_pcb;
291
292	KASSERT(solocked(so));
293
294	if (pcb == NULL)
295		return EINVAL;
296
297	return rfcomm_rcvd_pcb(pcb, sbspace(&so->so_rcv));
298}
299
300static int
301rfcomm_recvoob(struct socket *so, struct mbuf *m, int flags)
302{
303	KASSERT(solocked(so));
304
305	return EOPNOTSUPP;
306}
307
308static int
309rfcomm_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
310    struct mbuf *control, struct lwp *l)
311{
312	struct rfcomm_dlc *pcb = so->so_pcb;
313	int err = 0;
314	struct mbuf *m0;
315
316	KASSERT(solocked(so));
317	KASSERT(m != NULL);
318
319	if (control)	/* no use for that */
320		m_freem(control);
321
322	if (pcb == NULL) {
323		err = EINVAL;
324		goto release;
325	}
326
327	m0 = m_copypacket(m, M_DONTWAIT);
328	if (m0 == NULL) {
329		err = ENOMEM;
330		goto release;
331	}
332
333	sbappendstream(&so->so_snd, m);
334	return rfcomm_send_pcb(pcb, m0);
335
336release:
337	m_freem(m);
338	return err;
339}
340
341static int
342rfcomm_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
343{
344	KASSERT(solocked(so));
345
346	m_freem(m);
347	m_freem(control);
348
349	return EOPNOTSUPP;
350}
351
352static int
353rfcomm_purgeif(struct socket *so, struct ifnet *ifp)
354{
355
356	return EOPNOTSUPP;
357}
358
359/*
360 * rfcomm_ctloutput(req, socket, sockopt)
361 *
362 */
363int
364rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
365{
366	struct rfcomm_dlc *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_RFCOMM)
375		return ENOPROTOOPT;
376
377	switch(req) {
378	case PRCO_GETOPT:
379		err = rfcomm_getopt(pcb, sopt);
380		break;
381
382	case PRCO_SETOPT:
383		err = rfcomm_setopt(pcb, sopt);
384		break;
385
386	default:
387		err = ENOPROTOOPT;
388		break;
389	}
390
391	return err;
392}
393
394/**********************************************************************
395 *
396 * RFCOMM callbacks
397 */
398
399static void
400rfcomm_connecting(void *arg)
401{
402	/* struct socket *so = arg; */
403
404	KASSERT(arg != NULL);
405	DPRINTF("Connecting\n");
406}
407
408static void
409rfcomm_connected(void *arg)
410{
411	struct socket *so = arg;
412
413	KASSERT(so != NULL);
414	DPRINTF("Connected\n");
415	soisconnected(so);
416}
417
418static void
419rfcomm_disconnected(void *arg, int err)
420{
421	struct socket *so = arg;
422
423	KASSERT(so != NULL);
424	DPRINTF("Disconnected\n");
425
426	so->so_error = err;
427	soisdisconnected(so);
428}
429
430static void *
431rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
432    struct sockaddr_bt *raddr)
433{
434	struct socket *so = arg;
435
436	DPRINTF("New Connection\n");
437	so = sonewconn(so, false);
438	if (so == NULL)
439		return NULL;
440
441	soisconnecting(so);
442
443	return so->so_pcb;
444}
445
446/*
447 * rfcomm_complete(rfcomm_dlc, length)
448 *
449 * length bytes are sent and may be removed from socket buffer
450 */
451static void
452rfcomm_complete(void *arg, int length)
453{
454	struct socket *so = arg;
455
456	sbdrop(&so->so_snd, length);
457	sowwakeup(so);
458}
459
460/*
461 * rfcomm_linkmode(rfcomm_dlc, new)
462 *
463 * link mode change notification.
464 */
465static void
466rfcomm_linkmode(void *arg, int new)
467{
468	struct socket *so = arg;
469	struct sockopt sopt;
470	int mode;
471
472	DPRINTF("auth %s, encrypt %s, secure %s\n",
473		(new & RFCOMM_LM_AUTH ? "on" : "off"),
474		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
475		(new & RFCOMM_LM_SECURE ? "on" : "off"));
476
477	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
478	(void)rfcomm_getopt(so->so_pcb, &sopt);
479	(void)sockopt_getint(&sopt, &mode);
480	sockopt_destroy(&sopt);
481
482	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
483	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
484	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
485		rfcomm_disconnect_pcb(so->so_pcb, 0);
486}
487
488/*
489 * rfcomm_input(rfcomm_dlc, mbuf)
490 */
491static void
492rfcomm_input(void *arg, struct mbuf *m)
493{
494	struct socket *so = arg;
495
496	KASSERT(so != NULL);
497
498	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
499		printf("%s: %d bytes dropped (socket buffer full)\n",
500			__func__, m->m_pkthdr.len);
501		m_freem(m);
502		return;
503	}
504
505	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
506
507	sbappendstream(&so->so_rcv, m);
508	sorwakeup(so);
509}
510
511PR_WRAP_USRREQS(rfcomm)
512
513#define	rfcomm_attach		rfcomm_attach_wrapper
514#define	rfcomm_detach		rfcomm_detach_wrapper
515#define	rfcomm_accept		rfcomm_accept_wrapper
516#define	rfcomm_bind		rfcomm_bind_wrapper
517#define	rfcomm_listen		rfcomm_listen_wrapper
518#define	rfcomm_connect		rfcomm_connect_wrapper
519#define	rfcomm_connect2		rfcomm_connect2_wrapper
520#define	rfcomm_disconnect	rfcomm_disconnect_wrapper
521#define	rfcomm_shutdown		rfcomm_shutdown_wrapper
522#define	rfcomm_abort		rfcomm_abort_wrapper
523#define	rfcomm_ioctl		rfcomm_ioctl_wrapper
524#define	rfcomm_stat		rfcomm_stat_wrapper
525#define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
526#define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
527#define	rfcomm_rcvd		rfcomm_rcvd_wrapper
528#define	rfcomm_recvoob		rfcomm_recvoob_wrapper
529#define	rfcomm_send		rfcomm_send_wrapper
530#define	rfcomm_sendoob		rfcomm_sendoob_wrapper
531#define	rfcomm_purgeif		rfcomm_purgeif_wrapper
532
533const struct pr_usrreqs rfcomm_usrreqs = {
534	.pr_attach	= rfcomm_attach,
535	.pr_detach	= rfcomm_detach,
536	.pr_accept	= rfcomm_accept,
537	.pr_bind	= rfcomm_bind,
538	.pr_listen	= rfcomm_listen,
539	.pr_connect	= rfcomm_connect,
540	.pr_connect2	= rfcomm_connect2,
541	.pr_disconnect	= rfcomm_disconnect,
542	.pr_shutdown	= rfcomm_shutdown,
543	.pr_abort	= rfcomm_abort,
544	.pr_ioctl	= rfcomm_ioctl,
545	.pr_stat	= rfcomm_stat,
546	.pr_peeraddr	= rfcomm_peeraddr,
547	.pr_sockaddr	= rfcomm_sockaddr,
548	.pr_rcvd	= rfcomm_rcvd,
549	.pr_recvoob	= rfcomm_recvoob,
550	.pr_send	= rfcomm_send,
551	.pr_sendoob	= rfcomm_sendoob,
552	.pr_purgeif	= rfcomm_purgeif,
553};
554