rfcomm_socket.c revision 1.18 
1/*	$NetBSD: rfcomm_socket.c,v 1.18 2014/07/01 05:49:18 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 1.18 2014/07/01 05:49:18 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, u_long cmd, void *nam, struct ifnet *ifp)
129{
130	return EPASSTHROUGH;
131}
132
133/*
134 * User Request.
135 * up is socket
136 * m is optional mbuf chain containing message
137 * nam is either
138 *	optional mbuf chain containing an address
139 *	message flags (PRU_RCVD)
140 * ctl is either
141 *	optional mbuf chain containing socket options
142 *	optional interface pointer PRU_PURGEIF
143 * l is pointer to process requesting action (if any)
144 *
145 * we are responsible for disposing of m and ctl if
146 * they are mbuf chains
147 */
148static int
149rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
150		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
151{
152	struct rfcomm_dlc *pcb = up->so_pcb;
153	struct sockaddr_bt *sa;
154	struct mbuf *m0;
155	int err = 0;
156
157	DPRINTFN(2, "%s\n", prurequests[req]);
158	KASSERT(req != PRU_ATTACH);
159	KASSERT(req != PRU_DETACH);
160	KASSERT(req != PRU_CONTROL);
161
162	switch (req) {
163	case PRU_PURGEIF:
164		return EOPNOTSUPP;
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 rfcomm_disconnect(pcb, up->so_linger);
175
176	case PRU_ABORT:
177		rfcomm_disconnect(pcb, 0);
178		soisdisconnected(up);
179		rfcomm_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 rfcomm_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 rfcomm_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 rfcomm_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 rfcomm_sockaddr(pcb, sa);
218
219	case PRU_SHUTDOWN:
220		socantsendmore(up);
221		break;
222
223	case PRU_SEND:
224		KASSERT(m != NULL);
225
226		if (ctl)	/* no use for that */
227			m_freem(ctl);
228
229		m0 = m_copypacket(m, M_DONTWAIT);
230		if (m0 == NULL)
231			return ENOMEM;
232
233		sbappendstream(&up->so_snd, m);
234
235		return rfcomm_send(pcb, m0);
236
237	case PRU_SENSE:
238		return 0;		/* (no release) */
239
240	case PRU_RCVD:
241		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
242
243	case PRU_RCVOOB:
244		return EOPNOTSUPP;	/* (no release) */
245
246	case PRU_LISTEN:
247		return rfcomm_listen(pcb);
248
249	case PRU_ACCEPT:
250		KASSERT(nam != NULL);
251		sa = mtod(nam, struct sockaddr_bt *);
252		nam->m_len = sizeof(struct sockaddr_bt);
253		return rfcomm_peeraddr(pcb, sa);
254
255	case PRU_CONNECT2:
256	case PRU_SENDOOB:
257	case PRU_FASTTIMO:
258	case PRU_SLOWTIMO:
259	case PRU_PROTORCV:
260	case PRU_PROTOSEND:
261		err = EOPNOTSUPP;
262		break;
263
264	default:
265		UNKNOWN(req);
266		err = EOPNOTSUPP;
267		break;
268	}
269
270release:
271	if (m) m_freem(m);
272	if (ctl) m_freem(ctl);
273	return err;
274}
275
276/*
277 * rfcomm_ctloutput(req, socket, sockopt)
278 *
279 */
280int
281rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
282{
283	struct rfcomm_dlc *pcb = so->so_pcb;
284	int err = 0;
285
286	DPRINTFN(2, "%s\n", prcorequests[req]);
287
288	if (pcb == NULL)
289		return EINVAL;
290
291	if (sopt->sopt_level != BTPROTO_RFCOMM)
292		return ENOPROTOOPT;
293
294	switch(req) {
295	case PRCO_GETOPT:
296		err = rfcomm_getopt(pcb, sopt);
297		break;
298
299	case PRCO_SETOPT:
300		err = rfcomm_setopt(pcb, sopt);
301		break;
302
303	default:
304		err = ENOPROTOOPT;
305		break;
306	}
307
308	return err;
309}
310
311/**********************************************************************
312 *
313 * RFCOMM callbacks
314 */
315
316static void
317rfcomm_connecting(void *arg)
318{
319	/* struct socket *so = arg; */
320
321	KASSERT(arg != NULL);
322	DPRINTF("Connecting\n");
323}
324
325static void
326rfcomm_connected(void *arg)
327{
328	struct socket *so = arg;
329
330	KASSERT(so != NULL);
331	DPRINTF("Connected\n");
332	soisconnected(so);
333}
334
335static void
336rfcomm_disconnected(void *arg, int err)
337{
338	struct socket *so = arg;
339
340	KASSERT(so != NULL);
341	DPRINTF("Disconnected\n");
342
343	so->so_error = err;
344	soisdisconnected(so);
345}
346
347static void *
348rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
349    struct sockaddr_bt *raddr)
350{
351	struct socket *so = arg;
352
353	DPRINTF("New Connection\n");
354	so = sonewconn(so, false);
355	if (so == NULL)
356		return NULL;
357
358	soisconnecting(so);
359
360	return so->so_pcb;
361}
362
363/*
364 * rfcomm_complete(rfcomm_dlc, length)
365 *
366 * length bytes are sent and may be removed from socket buffer
367 */
368static void
369rfcomm_complete(void *arg, int length)
370{
371	struct socket *so = arg;
372
373	sbdrop(&so->so_snd, length);
374	sowwakeup(so);
375}
376
377/*
378 * rfcomm_linkmode(rfcomm_dlc, new)
379 *
380 * link mode change notification.
381 */
382static void
383rfcomm_linkmode(void *arg, int new)
384{
385	struct socket *so = arg;
386	struct sockopt sopt;
387	int mode;
388
389	DPRINTF("auth %s, encrypt %s, secure %s\n",
390		(new & RFCOMM_LM_AUTH ? "on" : "off"),
391		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
392		(new & RFCOMM_LM_SECURE ? "on" : "off"));
393
394	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
395	(void)rfcomm_getopt(so->so_pcb, &sopt);
396	(void)sockopt_getint(&sopt, &mode);
397	sockopt_destroy(&sopt);
398
399	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
400	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
401	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
402		rfcomm_disconnect(so->so_pcb, 0);
403}
404
405/*
406 * rfcomm_input(rfcomm_dlc, mbuf)
407 */
408static void
409rfcomm_input(void *arg, struct mbuf *m)
410{
411	struct socket *so = arg;
412
413	KASSERT(so != NULL);
414
415	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
416		printf("%s: %d bytes dropped (socket buffer full)\n",
417			__func__, m->m_pkthdr.len);
418		m_freem(m);
419		return;
420	}
421
422	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
423
424	sbappendstream(&so->so_rcv, m);
425	sorwakeup(so);
426}
427
428PR_WRAP_USRREQS(rfcomm)
429
430#define	rfcomm_attach		rfcomm_attach_wrapper
431#define	rfcomm_detach		rfcomm_detach_wrapper
432#define	rfcomm_ioctl		rfcomm_ioctl_wrapper
433#define	rfcomm_usrreq		rfcomm_usrreq_wrapper
434
435const struct pr_usrreqs rfcomm_usrreqs = {
436	.pr_attach	= rfcomm_attach,
437	.pr_detach	= rfcomm_detach,
438	.pr_ioctl	= rfcomm_ioctl,
439	.pr_generic	= rfcomm_usrreq,
440};
441