rfcomm_socket.c revision 1.24 
1/*	$NetBSD: rfcomm_socket.c,v 1.24 2014/07/09 14:41:42 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 1.24 2014/07/09 14:41:42 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_accept(struct socket *so, struct mbuf *nam)
129{
130	struct rfcomm_dlc *pcb = so->so_pcb;
131	struct sockaddr_bt *sa;
132
133	KASSERT(solocked(so));
134	KASSERT(nam != NULL);
135
136	if (pcb == NULL)
137		return EINVAL;
138
139	sa = mtod(nam, struct sockaddr_bt *);
140	nam->m_len = sizeof(struct sockaddr_bt);
141	return rfcomm_peeraddr_pcb(pcb, sa);
142}
143
144static int
145rfcomm_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
146{
147	return EPASSTHROUGH;
148}
149
150static int
151rfcomm_stat(struct socket *so, struct stat *ub)
152{
153	KASSERT(solocked(so));
154
155	return 0;
156}
157
158static int
159rfcomm_peeraddr(struct socket *so, struct mbuf *nam)
160{
161	struct rfcomm_dlc *pcb = so->so_pcb;
162	struct sockaddr_bt *sa;
163
164	KASSERT(solocked(so));
165	KASSERT(pcb != NULL);
166	KASSERT(nam != NULL);
167
168	sa = mtod(nam, struct sockaddr_bt *);
169	nam->m_len = sizeof(struct sockaddr_bt);
170	return rfcomm_peeraddr_pcb(pcb, sa);
171}
172
173static int
174rfcomm_sockaddr(struct socket *so, struct mbuf *nam)
175{
176	struct rfcomm_dlc *pcb = so->so_pcb;
177	struct sockaddr_bt *sa;
178
179	KASSERT(solocked(so));
180	KASSERT(pcb != NULL);
181	KASSERT(nam != NULL);
182
183	sa = mtod(nam, struct sockaddr_bt *);
184	nam->m_len = sizeof(struct sockaddr_bt);
185	return rfcomm_sockaddr_pcb(pcb, sa);
186}
187
188/*
189 * User Request.
190 * up is socket
191 * m is optional mbuf chain containing message
192 * nam is either
193 *	optional mbuf chain containing an address
194 *	message flags (PRU_RCVD)
195 * ctl is either
196 *	optional mbuf chain containing socket options
197 *	optional interface pointer PRU_PURGEIF
198 * l is pointer to process requesting action (if any)
199 *
200 * we are responsible for disposing of m and ctl if
201 * they are mbuf chains
202 */
203static int
204rfcomm_usrreq(struct socket *up, int req, struct mbuf *m,
205		struct mbuf *nam, struct mbuf *ctl, struct lwp *l)
206{
207	struct rfcomm_dlc *pcb = up->so_pcb;
208	struct sockaddr_bt *sa;
209	struct mbuf *m0;
210	int err = 0;
211
212	DPRINTFN(2, "%s\n", prurequests[req]);
213	KASSERT(req != PRU_ATTACH);
214	KASSERT(req != PRU_DETACH);
215	KASSERT(req != PRU_ACCEPT);
216	KASSERT(req != PRU_CONTROL);
217	KASSERT(req != PRU_SENSE);
218	KASSERT(req != PRU_PEERADDR);
219	KASSERT(req != PRU_SOCKADDR);
220
221	switch (req) {
222	case PRU_PURGEIF:
223		return EOPNOTSUPP;
224	}
225	if (pcb == NULL) {
226		err = EINVAL;
227		goto release;
228	}
229
230	switch(req) {
231	case PRU_DISCONNECT:
232		soisdisconnecting(up);
233		return rfcomm_disconnect(pcb, up->so_linger);
234
235	case PRU_ABORT:
236		rfcomm_disconnect(pcb, 0);
237		soisdisconnected(up);
238		rfcomm_detach(up);
239		return 0;
240
241	case PRU_BIND:
242		KASSERT(nam != NULL);
243		sa = mtod(nam, struct sockaddr_bt *);
244
245		if (sa->bt_len != sizeof(struct sockaddr_bt))
246			return EINVAL;
247
248		if (sa->bt_family != AF_BLUETOOTH)
249			return EAFNOSUPPORT;
250
251		return rfcomm_bind(pcb, sa);
252
253	case PRU_CONNECT:
254		KASSERT(nam != NULL);
255		sa = mtod(nam, struct sockaddr_bt *);
256
257		if (sa->bt_len != sizeof(struct sockaddr_bt))
258			return EINVAL;
259
260		if (sa->bt_family != AF_BLUETOOTH)
261			return EAFNOSUPPORT;
262
263		soisconnecting(up);
264		return rfcomm_connect(pcb, sa);
265
266	case PRU_SHUTDOWN:
267		socantsendmore(up);
268		break;
269
270	case PRU_SEND:
271		KASSERT(m != NULL);
272
273		if (ctl)	/* no use for that */
274			m_freem(ctl);
275
276		m0 = m_copypacket(m, M_DONTWAIT);
277		if (m0 == NULL)
278			return ENOMEM;
279
280		sbappendstream(&up->so_snd, m);
281
282		return rfcomm_send(pcb, m0);
283
284	case PRU_RCVD:
285		return rfcomm_rcvd(pcb, sbspace(&up->so_rcv));
286
287	case PRU_RCVOOB:
288		return EOPNOTSUPP;	/* (no release) */
289
290	case PRU_LISTEN:
291		return rfcomm_listen(pcb);
292
293	case PRU_CONNECT2:
294	case PRU_SENDOOB:
295	case PRU_FASTTIMO:
296	case PRU_SLOWTIMO:
297	case PRU_PROTORCV:
298	case PRU_PROTOSEND:
299		err = EOPNOTSUPP;
300		break;
301
302	default:
303		UNKNOWN(req);
304		err = EOPNOTSUPP;
305		break;
306	}
307
308release:
309	if (m) m_freem(m);
310	if (ctl) m_freem(ctl);
311	return err;
312}
313
314/*
315 * rfcomm_ctloutput(req, socket, sockopt)
316 *
317 */
318int
319rfcomm_ctloutput(int req, struct socket *so, struct sockopt *sopt)
320{
321	struct rfcomm_dlc *pcb = so->so_pcb;
322	int err = 0;
323
324	DPRINTFN(2, "%s\n", prcorequests[req]);
325
326	if (pcb == NULL)
327		return EINVAL;
328
329	if (sopt->sopt_level != BTPROTO_RFCOMM)
330		return ENOPROTOOPT;
331
332	switch(req) {
333	case PRCO_GETOPT:
334		err = rfcomm_getopt(pcb, sopt);
335		break;
336
337	case PRCO_SETOPT:
338		err = rfcomm_setopt(pcb, sopt);
339		break;
340
341	default:
342		err = ENOPROTOOPT;
343		break;
344	}
345
346	return err;
347}
348
349/**********************************************************************
350 *
351 * RFCOMM callbacks
352 */
353
354static void
355rfcomm_connecting(void *arg)
356{
357	/* struct socket *so = arg; */
358
359	KASSERT(arg != NULL);
360	DPRINTF("Connecting\n");
361}
362
363static void
364rfcomm_connected(void *arg)
365{
366	struct socket *so = arg;
367
368	KASSERT(so != NULL);
369	DPRINTF("Connected\n");
370	soisconnected(so);
371}
372
373static void
374rfcomm_disconnected(void *arg, int err)
375{
376	struct socket *so = arg;
377
378	KASSERT(so != NULL);
379	DPRINTF("Disconnected\n");
380
381	so->so_error = err;
382	soisdisconnected(so);
383}
384
385static void *
386rfcomm_newconn(void *arg, struct sockaddr_bt *laddr,
387    struct sockaddr_bt *raddr)
388{
389	struct socket *so = arg;
390
391	DPRINTF("New Connection\n");
392	so = sonewconn(so, false);
393	if (so == NULL)
394		return NULL;
395
396	soisconnecting(so);
397
398	return so->so_pcb;
399}
400
401/*
402 * rfcomm_complete(rfcomm_dlc, length)
403 *
404 * length bytes are sent and may be removed from socket buffer
405 */
406static void
407rfcomm_complete(void *arg, int length)
408{
409	struct socket *so = arg;
410
411	sbdrop(&so->so_snd, length);
412	sowwakeup(so);
413}
414
415/*
416 * rfcomm_linkmode(rfcomm_dlc, new)
417 *
418 * link mode change notification.
419 */
420static void
421rfcomm_linkmode(void *arg, int new)
422{
423	struct socket *so = arg;
424	struct sockopt sopt;
425	int mode;
426
427	DPRINTF("auth %s, encrypt %s, secure %s\n",
428		(new & RFCOMM_LM_AUTH ? "on" : "off"),
429		(new & RFCOMM_LM_ENCRYPT ? "on" : "off"),
430		(new & RFCOMM_LM_SECURE ? "on" : "off"));
431
432	sockopt_init(&sopt, BTPROTO_RFCOMM, SO_RFCOMM_LM, 0);
433	(void)rfcomm_getopt(so->so_pcb, &sopt);
434	(void)sockopt_getint(&sopt, &mode);
435	sockopt_destroy(&sopt);
436
437	if (((mode & RFCOMM_LM_AUTH) && !(new & RFCOMM_LM_AUTH))
438	    || ((mode & RFCOMM_LM_ENCRYPT) && !(new & RFCOMM_LM_ENCRYPT))
439	    || ((mode & RFCOMM_LM_SECURE) && !(new & RFCOMM_LM_SECURE)))
440		rfcomm_disconnect(so->so_pcb, 0);
441}
442
443/*
444 * rfcomm_input(rfcomm_dlc, mbuf)
445 */
446static void
447rfcomm_input(void *arg, struct mbuf *m)
448{
449	struct socket *so = arg;
450
451	KASSERT(so != NULL);
452
453	if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
454		printf("%s: %d bytes dropped (socket buffer full)\n",
455			__func__, m->m_pkthdr.len);
456		m_freem(m);
457		return;
458	}
459
460	DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
461
462	sbappendstream(&so->so_rcv, m);
463	sorwakeup(so);
464}
465
466PR_WRAP_USRREQS(rfcomm)
467
468#define	rfcomm_attach		rfcomm_attach_wrapper
469#define	rfcomm_detach		rfcomm_detach_wrapper
470#define	rfcomm_accept		rfcomm_accept_wrapper
471#define	rfcomm_ioctl		rfcomm_ioctl_wrapper
472#define	rfcomm_stat		rfcomm_stat_wrapper
473#define	rfcomm_peeraddr		rfcomm_peeraddr_wrapper
474#define	rfcomm_sockaddr		rfcomm_sockaddr_wrapper
475#define	rfcomm_usrreq		rfcomm_usrreq_wrapper
476
477const struct pr_usrreqs rfcomm_usrreqs = {
478	.pr_attach	= rfcomm_attach,
479	.pr_detach	= rfcomm_detach,
480	.pr_accept	= rfcomm_accept,
481	.pr_ioctl	= rfcomm_ioctl,
482	.pr_stat	= rfcomm_stat,
483	.pr_peeraddr	= rfcomm_peeraddr,
484	.pr_sockaddr	= rfcomm_sockaddr,
485	.pr_generic	= rfcomm_usrreq,
486};
487