1/* $NetBSD: l2cap_socket.c,v 1.35 2015/05/02 17:18:03 rtr Exp $ */
2
3/*-
4 * Copyright (c) 2005 Iain Hibbert.
5 * Copyright (c) 2006 Itronix Inc.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of Itronix Inc. may not be used to endorse
17 * or promote products derived from this software without specific
18 * prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
24 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: l2cap_socket.c,v 1.35 2015/05/02 17:18:03 rtr Exp $");
35
36/* load symbolic names */
37#ifdef BLUETOOTH_DEBUG
38#define PRUREQUESTS
39#define PRCOREQUESTS
40#endif
41
42#include <sys/param.h>
43#include <sys/domain.h>
44#include <sys/kernel.h>
45#include <sys/mbuf.h>
46#include <sys/proc.h>
47#include <sys/protosw.h>
48#include <sys/socket.h>
49#include <sys/socketvar.h>
50#include <sys/systm.h>
51
52#include <netbt/bluetooth.h>
53#include <netbt/l2cap.h>
54
55/*
56 * L2CAP Sockets
57 *
58 * SOCK_SEQPACKET - normal L2CAP connection
59 *
60 * SOCK_DGRAM - connectionless L2CAP - XXX not yet
61 */
62
63static void l2cap_connecting(void *);
64static void l2cap_connected(void *);
65static void l2cap_disconnected(void *, int);
66static void *l2cap_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
67static void l2cap_complete(void *, int);
68static void l2cap_linkmode(void *, int);
69static void l2cap_input(void *, struct mbuf *);
70
71static const struct btproto l2cap_proto = {
72 l2cap_connecting,
73 l2cap_connected,
74 l2cap_disconnected,
75 l2cap_newconn,
76 l2cap_complete,
77 l2cap_linkmode,
78 l2cap_input,
79};
80
81/* sysctl variables */
82int l2cap_sendspace = 4096;
83int l2cap_recvspace = 4096;
84
85static int
86l2cap_attach(struct socket *so, int proto)
87{
88 int error;
89
90 KASSERT(so->so_pcb == NULL);
91
92 if (so->so_lock == NULL) {
93 mutex_obj_hold(bt_lock);
94 so->so_lock = bt_lock;
95 solock(so);
96 }
97 KASSERT(solocked(so));
98
99 /*
100 * For L2CAP socket PCB we just use an l2cap_channel structure
101 * since we have nothing to add..
102 */
103 error = soreserve(so, l2cap_sendspace, l2cap_recvspace);
104 if (error)
105 return error;
106
107 return l2cap_attach_pcb((struct l2cap_channel **)&so->so_pcb,
108 &l2cap_proto, so);
109}
110
111static void
112l2cap_detach(struct socket *so)
113{
114 KASSERT(so->so_pcb != NULL);
115 l2cap_detach_pcb((struct l2cap_channel **)&so->so_pcb);
116 KASSERT(so->so_pcb == NULL);
117}
118
119static int
120l2cap_accept(struct socket *so, struct sockaddr *nam)
121{
122 struct l2cap_channel *pcb = so->so_pcb;
123
124 KASSERT(solocked(so));
125 KASSERT(nam != NULL);
126
127 if (pcb == NULL)
128 return EINVAL;
129
130 return l2cap_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
131}
132
133static int
134l2cap_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
135{
136 struct l2cap_channel *pcb = so->so_pcb;
137 struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
138
139 KASSERT(solocked(so));
140 KASSERT(nam != NULL);
141
142 if (pcb == NULL)
143 return EINVAL;
144
145 if (sa->bt_len != sizeof(struct sockaddr_bt))
146 return EINVAL;
147
148 if (sa->bt_family != AF_BLUETOOTH)
149 return EAFNOSUPPORT;
150
151 return l2cap_bind_pcb(pcb, sa);
152}
153
154static int
155l2cap_listen(struct socket *so, struct lwp *l)
156{
157 struct l2cap_channel *pcb = so->so_pcb;
158
159 KASSERT(solocked(so));
160
161 if (pcb == NULL)
162 return EINVAL;
163
164 return l2cap_listen_pcb(pcb);
165}
166
167static int
168l2cap_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
169{
170 struct l2cap_channel *pcb = so->so_pcb;
171 struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;
172
173 KASSERT(solocked(so));
174 KASSERT(nam != NULL);
175
176 if (pcb == NULL)
177 return EINVAL;
178
179 if (sa->bt_len != sizeof(struct sockaddr_bt))
180 return EINVAL;
181
182 if (sa->bt_family != AF_BLUETOOTH)
183 return EAFNOSUPPORT;
184
185 soisconnecting(so);
186 return l2cap_connect_pcb(pcb, sa);
187}
188
189static int
190l2cap_connect2(struct socket *so, struct socket *so2)
191{
192 KASSERT(solocked(so));
193
194 if (so->so_pcb == NULL)
195 return EINVAL;
196
197 return EOPNOTSUPP;
198}
199
200static int
201l2cap_disconnect(struct socket *so)
202{
203 struct l2cap_channel *pcb = so->so_pcb;
204
205 KASSERT(solocked(so));
206
207 if (pcb == NULL)
208 return EINVAL;
209
210 soisdisconnecting(so);
211 return l2cap_disconnect_pcb(pcb, so->so_linger);
212}
213
214static int
215l2cap_shutdown(struct socket *so)
216{
217 KASSERT(solocked(so));
218
219 socantsendmore(so);
220 return 0;
221}
222
223static int
224l2cap_abort(struct socket *so)
225{
226 struct l2cap_channel *pcb = so->so_pcb;
227
228 KASSERT(solocked(so));
229
230 if (pcb == NULL)
231 return EINVAL;
232
233 l2cap_disconnect_pcb(pcb, 0);
234 soisdisconnected(so);
235 l2cap_detach(so);
236 return 0;
237}
238
239static int
240l2cap_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
241{
242 return EPASSTHROUGH;
243}
244
245static int
246l2cap_stat(struct socket *so, struct stat *ub)
247{
248 KASSERT(solocked(so));
249
250 return 0;
251}
252
253static int
254l2cap_peeraddr(struct socket *so, struct sockaddr *nam)
255{
256 struct l2cap_channel *pcb = so->so_pcb;
257
258 KASSERT(solocked(so));
259 KASSERT(pcb != NULL);
260 KASSERT(nam != NULL);
261
262 return l2cap_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
263}
264
265static int
266l2cap_sockaddr(struct socket *so, struct sockaddr *nam)
267{
268 struct l2cap_channel *pcb = so->so_pcb;
269
270 KASSERT(solocked(so));
271 KASSERT(pcb != NULL);
272 KASSERT(nam != NULL);
273
274 return l2cap_sockaddr_pcb(pcb, (struct sockaddr_bt *)nam);
275}
276
277static int
278l2cap_rcvd(struct socket *so, int flags, struct lwp *l)
279{
280 KASSERT(solocked(so));
281
282 return EOPNOTSUPP;
283}
284
285static int
286l2cap_recvoob(struct socket *so, struct mbuf *m, int flags)
287{
288 KASSERT(solocked(so));
289
290 return EOPNOTSUPP;
291}
292
293static int
294l2cap_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
295 struct mbuf *control, struct lwp *l)
296{
297 struct l2cap_channel *pcb = so->so_pcb;
298 struct mbuf *m0;
299 int error = 0;
300
301 KASSERT(solocked(so));
302 KASSERT(m != NULL);
303
304 if (control)
305 m_freem(control);
306
307 if (pcb == NULL) {
308 error = EINVAL;
309 goto release;
310 }
311
312 if (m->m_pkthdr.len == 0)
313 goto release;
314
315 if (m->m_pkthdr.len > pcb->lc_omtu) {
316 error = EMSGSIZE;
317 goto release;
318 }
319
320 m0 = m_copypacket(m, M_DONTWAIT);
321 if (m0 == NULL) {
322 error = ENOMEM;
323 goto release;
324 }
325
326 sbappendrecord(&so->so_snd, m);
327 return l2cap_send_pcb(pcb, m0);
328
329release:
330 if (m)
331 m_freem(m);
332
333 return error;
334}
335
336static int
337l2cap_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
338{
339 KASSERT(solocked(so));
340
341 if (m)
342 m_freem(m);
343 if (control)
344 m_freem(control);
345
346 return EOPNOTSUPP;
347}
348
349static int
350l2cap_purgeif(struct socket *so, struct ifnet *ifp)
351{
352
353 return EOPNOTSUPP;
354}
355
356/*
357 * l2cap_ctloutput(req, socket, sockopt)
358 *
359 * Apply configuration commands to channel. This corresponds to
360 * "Reconfigure Channel Request" in the L2CAP specification.
361 */
362int
363l2cap_ctloutput(int req, struct socket *so, struct sockopt *sopt)
364{
365 struct l2cap_channel *pcb = so->so_pcb;
366 int err = 0;
367
368 DPRINTFN(2, "%s\n", prcorequests[req]);
369
370 if (pcb == NULL)
371 return EINVAL;
372
373 if (sopt->sopt_level != BTPROTO_L2CAP)
374 return ENOPROTOOPT;
375
376 switch(req) {
377 case PRCO_GETOPT:
378 err = l2cap_getopt(pcb, sopt);
379 break;
380
381 case PRCO_SETOPT:
382 err = l2cap_setopt(pcb, sopt);
383 break;
384
385 default:
386 err = ENOPROTOOPT;
387 break;
388 }
389
390 return err;
391}
392
393/**********************************************************************
394 *
395 * L2CAP Protocol socket callbacks
396 *
397 */
398
399static void
400l2cap_connecting(void *arg)
401{
402 struct socket *so = arg;
403
404 DPRINTF("Connecting\n");
405 soisconnecting(so);
406}
407
408static void
409l2cap_connected(void *arg)
410{
411 struct socket *so = arg;
412
413 DPRINTF("Connected\n");
414 soisconnected(so);
415}
416
417static void
418l2cap_disconnected(void *arg, int err)
419{
420 struct socket *so = arg;
421
422 DPRINTF("Disconnected (%d)\n", err);
423
424 so->so_error = err;
425 soisdisconnected(so);
426}
427
428static void *
429l2cap_newconn(void *arg, struct sockaddr_bt *laddr,
430 struct sockaddr_bt *raddr)
431{
432 struct socket *so = arg;
433
434 DPRINTF("New Connection\n");
435 so = sonewconn(so, false);
436 if (so == NULL)
437 return NULL;
438
439 soisconnecting(so);
440
441 return so->so_pcb;
442}
443
444static void
445l2cap_complete(void *arg, int count)
446{
447 struct socket *so = arg;
448
449 while (count-- > 0)
450 sbdroprecord(&so->so_snd);
451
452 sowwakeup(so);
453}
454
455static void
456l2cap_linkmode(void *arg, int new)
457{
458 struct socket *so = arg;
459 struct sockopt sopt;
460 int mode;
461
462 DPRINTF("auth %s, encrypt %s, secure %s\n",
463 (new & L2CAP_LM_AUTH ? "on" : "off"),
464 (new & L2CAP_LM_ENCRYPT ? "on" : "off"),
465 (new & L2CAP_LM_SECURE ? "on" : "off"));
466
467 sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0);
468 (void)l2cap_getopt(so->so_pcb, &sopt);
469 (void)sockopt_getint(&sopt, &mode);
470 sockopt_destroy(&sopt);
471
472 if (((mode & L2CAP_LM_AUTH) && !(new & L2CAP_LM_AUTH))
473 || ((mode & L2CAP_LM_ENCRYPT) && !(new & L2CAP_LM_ENCRYPT))
474 || ((mode & L2CAP_LM_SECURE) && !(new & L2CAP_LM_SECURE)))
475 l2cap_disconnect_pcb(so->so_pcb, 0);
476}
477
478static void
479l2cap_input(void *arg, struct mbuf *m)
480{
481 struct socket *so = arg;
482
483 if (m->m_pkthdr.len > sbspace(&so->so_rcv)) {
484 printf("%s: packet (%d bytes) dropped (socket buffer full)\n",
485 __func__, m->m_pkthdr.len);
486 m_freem(m);
487 return;
488 }
489
490 DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);
491
492 sbappendrecord(&so->so_rcv, m);
493 sorwakeup(so);
494}
495
496PR_WRAP_USRREQS(l2cap)
497
498#define l2cap_attach l2cap_attach_wrapper
499#define l2cap_detach l2cap_detach_wrapper
500#define l2cap_accept l2cap_accept_wrapper
501#define l2cap_bind l2cap_bind_wrapper
502#define l2cap_listen l2cap_listen_wrapper
503#define l2cap_connect l2cap_connect_wrapper
504#define l2cap_connect2 l2cap_connect2_wrapper
505#define l2cap_disconnect l2cap_disconnect_wrapper
506#define l2cap_shutdown l2cap_shutdown_wrapper
507#define l2cap_abort l2cap_abort_wrapper
508#define l2cap_ioctl l2cap_ioctl_wrapper
509#define l2cap_stat l2cap_stat_wrapper
510#define l2cap_peeraddr l2cap_peeraddr_wrapper
511#define l2cap_sockaddr l2cap_sockaddr_wrapper
512#define l2cap_rcvd l2cap_rcvd_wrapper
513#define l2cap_recvoob l2cap_recvoob_wrapper
514#define l2cap_send l2cap_send_wrapper
515#define l2cap_sendoob l2cap_sendoob_wrapper
516#define l2cap_purgeif l2cap_purgeif_wrapper
517
518const struct pr_usrreqs l2cap_usrreqs = {
519 .pr_attach = l2cap_attach,
520 .pr_detach = l2cap_detach,
521 .pr_accept = l2cap_accept,
522 .pr_bind = l2cap_bind,
523 .pr_listen = l2cap_listen,
524 .pr_connect = l2cap_connect,
525 .pr_connect2 = l2cap_connect2,
526 .pr_disconnect = l2cap_disconnect,
527 .pr_shutdown = l2cap_shutdown,
528 .pr_abort = l2cap_abort,
529 .pr_ioctl = l2cap_ioctl,
530 .pr_stat = l2cap_stat,
531 .pr_peeraddr = l2cap_peeraddr,
532 .pr_sockaddr = l2cap_sockaddr,
533 .pr_rcvd = l2cap_rcvd,
534 .pr_recvoob = l2cap_recvoob,
535 .pr_send = l2cap_send,
536 .pr_sendoob = l2cap_sendoob,
537 .pr_purgeif = l2cap_purgeif,
538};
539