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path: root/net/nfc/llcp_sock.c
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Diffstat (limited to 'net/nfc/llcp_sock.c')
-rw-r--r--net/nfc/llcp_sock.c1025
1 files changed, 1025 insertions, 0 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
new file mode 100644
index 000000000000..4950c189705e
--- /dev/null
+++ b/net/nfc/llcp_sock.c
@@ -0,0 +1,1025 @@
1/*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/nfc.h>
26
27#include "nfc.h"
28#include "llcp.h"
29
30static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
31{
32 DECLARE_WAITQUEUE(wait, current);
33 int err = 0;
34
35 pr_debug("sk %p", sk);
36
37 add_wait_queue(sk_sleep(sk), &wait);
38 set_current_state(TASK_INTERRUPTIBLE);
39
40 while (sk->sk_state != state) {
41 if (!timeo) {
42 err = -EINPROGRESS;
43 break;
44 }
45
46 if (signal_pending(current)) {
47 err = sock_intr_errno(timeo);
48 break;
49 }
50
51 release_sock(sk);
52 timeo = schedule_timeout(timeo);
53 lock_sock(sk);
54 set_current_state(TASK_INTERRUPTIBLE);
55
56 err = sock_error(sk);
57 if (err)
58 break;
59 }
60
61 __set_current_state(TASK_RUNNING);
62 remove_wait_queue(sk_sleep(sk), &wait);
63 return err;
64}
65
66static struct proto llcp_sock_proto = {
67 .name = "NFC_LLCP",
68 .owner = THIS_MODULE,
69 .obj_size = sizeof(struct nfc_llcp_sock),
70};
71
72static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
73{
74 struct sock *sk = sock->sk;
75 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
76 struct nfc_llcp_local *local;
77 struct nfc_dev *dev;
78 struct sockaddr_nfc_llcp llcp_addr;
79 int len, ret = 0;
80
81 if (!addr || addr->sa_family != AF_NFC)
82 return -EINVAL;
83
84 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
85
86 memset(&llcp_addr, 0, sizeof(llcp_addr));
87 len = min_t(unsigned int, sizeof(llcp_addr), alen);
88 memcpy(&llcp_addr, addr, len);
89
90 /* This is going to be a listening socket, dsap must be 0 */
91 if (llcp_addr.dsap != 0)
92 return -EINVAL;
93
94 lock_sock(sk);
95
96 if (sk->sk_state != LLCP_CLOSED) {
97 ret = -EBADFD;
98 goto error;
99 }
100
101 dev = nfc_get_device(llcp_addr.dev_idx);
102 if (dev == NULL) {
103 ret = -ENODEV;
104 goto error;
105 }
106
107 local = nfc_llcp_find_local(dev);
108 if (local == NULL) {
109 ret = -ENODEV;
110 goto put_dev;
111 }
112
113 llcp_sock->dev = dev;
114 llcp_sock->local = nfc_llcp_local_get(local);
115 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
116 llcp_sock->service_name_len = min_t(unsigned int,
117 llcp_addr.service_name_len,
118 NFC_LLCP_MAX_SERVICE_NAME);
119 llcp_sock->service_name = kmemdup(llcp_addr.service_name,
120 llcp_sock->service_name_len,
121 GFP_KERNEL);
122
123 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
124 if (llcp_sock->ssap == LLCP_SAP_MAX) {
125 ret = -EADDRINUSE;
126 goto put_dev;
127 }
128
129 llcp_sock->reserved_ssap = llcp_sock->ssap;
130
131 nfc_llcp_sock_link(&local->sockets, sk);
132
133 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
134
135 sk->sk_state = LLCP_BOUND;
136
137put_dev:
138 nfc_put_device(dev);
139
140error:
141 release_sock(sk);
142 return ret;
143}
144
145static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
146 int alen)
147{
148 struct sock *sk = sock->sk;
149 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
150 struct nfc_llcp_local *local;
151 struct nfc_dev *dev;
152 struct sockaddr_nfc_llcp llcp_addr;
153 int len, ret = 0;
154
155 if (!addr || addr->sa_family != AF_NFC)
156 return -EINVAL;
157
158 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
159
160 memset(&llcp_addr, 0, sizeof(llcp_addr));
161 len = min_t(unsigned int, sizeof(llcp_addr), alen);
162 memcpy(&llcp_addr, addr, len);
163
164 lock_sock(sk);
165
166 if (sk->sk_state != LLCP_CLOSED) {
167 ret = -EBADFD;
168 goto error;
169 }
170
171 dev = nfc_get_device(llcp_addr.dev_idx);
172 if (dev == NULL) {
173 ret = -ENODEV;
174 goto error;
175 }
176
177 local = nfc_llcp_find_local(dev);
178 if (local == NULL) {
179 ret = -ENODEV;
180 goto put_dev;
181 }
182
183 llcp_sock->dev = dev;
184 llcp_sock->local = nfc_llcp_local_get(local);
185 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
186
187 nfc_llcp_sock_link(&local->raw_sockets, sk);
188
189 sk->sk_state = LLCP_BOUND;
190
191put_dev:
192 nfc_put_device(dev);
193
194error:
195 release_sock(sk);
196 return ret;
197}
198
199static int llcp_sock_listen(struct socket *sock, int backlog)
200{
201 struct sock *sk = sock->sk;
202 int ret = 0;
203
204 pr_debug("sk %p backlog %d\n", sk, backlog);
205
206 lock_sock(sk);
207
208 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
209 sk->sk_state != LLCP_BOUND) {
210 ret = -EBADFD;
211 goto error;
212 }
213
214 sk->sk_max_ack_backlog = backlog;
215 sk->sk_ack_backlog = 0;
216
217 pr_debug("Socket listening\n");
218 sk->sk_state = LLCP_LISTEN;
219
220error:
221 release_sock(sk);
222
223 return ret;
224}
225
226static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
227 char __user *optval, unsigned int optlen)
228{
229 struct sock *sk = sock->sk;
230 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
231 u32 opt;
232 int err = 0;
233
234 pr_debug("%p optname %d\n", sk, optname);
235
236 if (level != SOL_NFC)
237 return -ENOPROTOOPT;
238
239 lock_sock(sk);
240
241 switch (optname) {
242 case NFC_LLCP_RW:
243 if (sk->sk_state == LLCP_CONNECTED ||
244 sk->sk_state == LLCP_BOUND ||
245 sk->sk_state == LLCP_LISTEN) {
246 err = -EINVAL;
247 break;
248 }
249
250 if (get_user(opt, (u32 __user *) optval)) {
251 err = -EFAULT;
252 break;
253 }
254
255 if (opt > LLCP_MAX_RW) {
256 err = -EINVAL;
257 break;
258 }
259
260 llcp_sock->rw = (u8) opt;
261
262 break;
263
264 case NFC_LLCP_MIUX:
265 if (sk->sk_state == LLCP_CONNECTED ||
266 sk->sk_state == LLCP_BOUND ||
267 sk->sk_state == LLCP_LISTEN) {
268 err = -EINVAL;
269 break;
270 }
271
272 if (get_user(opt, (u32 __user *) optval)) {
273 err = -EFAULT;
274 break;
275 }
276
277 if (opt > LLCP_MAX_MIUX) {
278 err = -EINVAL;
279 break;
280 }
281
282 llcp_sock->miux = cpu_to_be16((u16) opt);
283
284 break;
285
286 default:
287 err = -ENOPROTOOPT;
288 break;
289 }
290
291 release_sock(sk);
292
293 pr_debug("%p rw %d miux %d\n", llcp_sock,
294 llcp_sock->rw, llcp_sock->miux);
295
296 return err;
297}
298
299static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, int __user *optlen)
301{
302 struct nfc_llcp_local *local;
303 struct sock *sk = sock->sk;
304 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
305 int len, err = 0;
306 u16 miux, remote_miu;
307 u8 rw;
308
309 pr_debug("%p optname %d\n", sk, optname);
310
311 if (level != SOL_NFC)
312 return -ENOPROTOOPT;
313
314 if (get_user(len, optlen))
315 return -EFAULT;
316
317 local = llcp_sock->local;
318 if (!local)
319 return -ENODEV;
320
321 len = min_t(u32, len, sizeof(u32));
322
323 lock_sock(sk);
324
325 switch (optname) {
326 case NFC_LLCP_RW:
327 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
328 if (put_user(rw, (u32 __user *) optval))
329 err = -EFAULT;
330
331 break;
332
333 case NFC_LLCP_MIUX:
334 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
335 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
336
337 if (put_user(miux, (u32 __user *) optval))
338 err = -EFAULT;
339
340 break;
341
342 case NFC_LLCP_REMOTE_MIU:
343 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
344 local->remote_miu : llcp_sock->remote_miu;
345
346 if (put_user(remote_miu, (u32 __user *) optval))
347 err = -EFAULT;
348
349 break;
350
351 case NFC_LLCP_REMOTE_LTO:
352 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
353 err = -EFAULT;
354
355 break;
356
357 case NFC_LLCP_REMOTE_RW:
358 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
359 err = -EFAULT;
360
361 break;
362
363 default:
364 err = -ENOPROTOOPT;
365 break;
366 }
367
368 release_sock(sk);
369
370 if (put_user(len, optlen))
371 return -EFAULT;
372
373 return err;
374}
375
376void nfc_llcp_accept_unlink(struct sock *sk)
377{
378 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
379
380 pr_debug("state %d\n", sk->sk_state);
381
382 list_del_init(&llcp_sock->accept_queue);
383 sk_acceptq_removed(llcp_sock->parent);
384 llcp_sock->parent = NULL;
385
386 sock_put(sk);
387}
388
389void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
390{
391 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
392 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
393
394 /* Lock will be free from unlink */
395 sock_hold(sk);
396
397 list_add_tail(&llcp_sock->accept_queue,
398 &llcp_sock_parent->accept_queue);
399 llcp_sock->parent = parent;
400 sk_acceptq_added(parent);
401}
402
403struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
404 struct socket *newsock)
405{
406 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
407 struct sock *sk;
408
409 llcp_parent = nfc_llcp_sock(parent);
410
411 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
412 accept_queue) {
413 sk = &lsk->sk;
414 lock_sock(sk);
415
416 if (sk->sk_state == LLCP_CLOSED) {
417 release_sock(sk);
418 nfc_llcp_accept_unlink(sk);
419 continue;
420 }
421
422 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
423 list_del_init(&lsk->accept_queue);
424 sock_put(sk);
425
426 if (newsock)
427 sock_graft(sk, newsock);
428
429 release_sock(sk);
430
431 pr_debug("Returning sk state %d\n", sk->sk_state);
432
433 sk_acceptq_removed(parent);
434
435 return sk;
436 }
437
438 release_sock(sk);
439 }
440
441 return NULL;
442}
443
444static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
445 int flags)
446{
447 DECLARE_WAITQUEUE(wait, current);
448 struct sock *sk = sock->sk, *new_sk;
449 long timeo;
450 int ret = 0;
451
452 pr_debug("parent %p\n", sk);
453
454 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
455
456 if (sk->sk_state != LLCP_LISTEN) {
457 ret = -EBADFD;
458 goto error;
459 }
460
461 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
462
463 /* Wait for an incoming connection. */
464 add_wait_queue_exclusive(sk_sleep(sk), &wait);
465 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
466 set_current_state(TASK_INTERRUPTIBLE);
467
468 if (!timeo) {
469 ret = -EAGAIN;
470 break;
471 }
472
473 if (signal_pending(current)) {
474 ret = sock_intr_errno(timeo);
475 break;
476 }
477
478 release_sock(sk);
479 timeo = schedule_timeout(timeo);
480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
481 }
482 __set_current_state(TASK_RUNNING);
483 remove_wait_queue(sk_sleep(sk), &wait);
484
485 if (ret)
486 goto error;
487
488 newsock->state = SS_CONNECTED;
489
490 pr_debug("new socket %p\n", new_sk);
491
492error:
493 release_sock(sk);
494
495 return ret;
496}
497
498static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
499 int *len, int peer)
500{
501 struct sock *sk = sock->sk;
502 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
503 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
504
505 if (llcp_sock == NULL || llcp_sock->dev == NULL)
506 return -EBADFD;
507
508 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
509 llcp_sock->dsap, llcp_sock->ssap);
510
511 uaddr->sa_family = AF_NFC;
512
513 *len = sizeof(struct sockaddr_nfc_llcp);
514
515 llcp_addr->dev_idx = llcp_sock->dev->idx;
516 llcp_addr->target_idx = llcp_sock->target_idx;
517 llcp_addr->dsap = llcp_sock->dsap;
518 llcp_addr->ssap = llcp_sock->ssap;
519 llcp_addr->service_name_len = llcp_sock->service_name_len;
520 memcpy(llcp_addr->service_name, llcp_sock->service_name,
521 llcp_addr->service_name_len);
522
523 return 0;
524}
525
526static inline unsigned int llcp_accept_poll(struct sock *parent)
527{
528 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
529 struct sock *sk;
530
531 parent_sock = nfc_llcp_sock(parent);
532
533 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
534 accept_queue) {
535 sk = &llcp_sock->sk;
536
537 if (sk->sk_state == LLCP_CONNECTED)
538 return POLLIN | POLLRDNORM;
539 }
540
541 return 0;
542}
543
544static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
545 poll_table *wait)
546{
547 struct sock *sk = sock->sk;
548 unsigned int mask = 0;
549
550 pr_debug("%p\n", sk);
551
552 sock_poll_wait(file, sk_sleep(sk), wait);
553
554 if (sk->sk_state == LLCP_LISTEN)
555 return llcp_accept_poll(sk);
556
557 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
558 mask |= POLLERR;
559
560 if (!skb_queue_empty(&sk->sk_receive_queue))
561 mask |= POLLIN | POLLRDNORM;
562
563 if (sk->sk_state == LLCP_CLOSED)
564 mask |= POLLHUP;
565
566 if (sk->sk_shutdown & RCV_SHUTDOWN)
567 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
568
569 if (sk->sk_shutdown == SHUTDOWN_MASK)
570 mask |= POLLHUP;
571
572 if (sock_writeable(sk))
573 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
574 else
575 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
576
577 pr_debug("mask 0x%x\n", mask);
578
579 return mask;
580}
581
582static int llcp_sock_release(struct socket *sock)
583{
584 struct sock *sk = sock->sk;
585 struct nfc_llcp_local *local;
586 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
587 int err = 0;
588
589 if (!sk)
590 return 0;
591
592 pr_debug("%p\n", sk);
593
594 local = llcp_sock->local;
595 if (local == NULL) {
596 err = -ENODEV;
597 goto out;
598 }
599
600 lock_sock(sk);
601
602 /* Send a DISC */
603 if (sk->sk_state == LLCP_CONNECTED)
604 nfc_llcp_disconnect(llcp_sock);
605
606 if (sk->sk_state == LLCP_LISTEN) {
607 struct nfc_llcp_sock *lsk, *n;
608 struct sock *accept_sk;
609
610 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
611 accept_queue) {
612 accept_sk = &lsk->sk;
613 lock_sock(accept_sk);
614
615 nfc_llcp_disconnect(lsk);
616 nfc_llcp_accept_unlink(accept_sk);
617
618 release_sock(accept_sk);
619 }
620 }
621
622 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
623 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
624
625 release_sock(sk);
626
627 if (sock->type == SOCK_RAW)
628 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
629 else
630 nfc_llcp_sock_unlink(&local->sockets, sk);
631
632out:
633 sock_orphan(sk);
634 sock_put(sk);
635
636 return err;
637}
638
639static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
640 int len, int flags)
641{
642 struct sock *sk = sock->sk;
643 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
644 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
645 struct nfc_dev *dev;
646 struct nfc_llcp_local *local;
647 int ret = 0;
648
649 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
650
651 if (!addr || len < sizeof(struct sockaddr_nfc) ||
652 addr->sa_family != AF_NFC)
653 return -EINVAL;
654
655 if (addr->service_name_len == 0 && addr->dsap == 0)
656 return -EINVAL;
657
658 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
659 addr->target_idx, addr->nfc_protocol);
660
661 lock_sock(sk);
662
663 if (sk->sk_state == LLCP_CONNECTED) {
664 ret = -EISCONN;
665 goto error;
666 }
667
668 dev = nfc_get_device(addr->dev_idx);
669 if (dev == NULL) {
670 ret = -ENODEV;
671 goto error;
672 }
673
674 local = nfc_llcp_find_local(dev);
675 if (local == NULL) {
676 ret = -ENODEV;
677 goto put_dev;
678 }
679
680 device_lock(&dev->dev);
681 if (dev->dep_link_up == false) {
682 ret = -ENOLINK;
683 device_unlock(&dev->dev);
684 goto put_dev;
685 }
686 device_unlock(&dev->dev);
687
688 if (local->rf_mode == NFC_RF_INITIATOR &&
689 addr->target_idx != local->target_idx) {
690 ret = -ENOLINK;
691 goto put_dev;
692 }
693
694 llcp_sock->dev = dev;
695 llcp_sock->local = nfc_llcp_local_get(local);
696 llcp_sock->remote_miu = llcp_sock->local->remote_miu;
697 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
698 if (llcp_sock->ssap == LLCP_SAP_MAX) {
699 ret = -ENOMEM;
700 goto put_dev;
701 }
702
703 llcp_sock->reserved_ssap = llcp_sock->ssap;
704
705 if (addr->service_name_len == 0)
706 llcp_sock->dsap = addr->dsap;
707 else
708 llcp_sock->dsap = LLCP_SAP_SDP;
709 llcp_sock->nfc_protocol = addr->nfc_protocol;
710 llcp_sock->service_name_len = min_t(unsigned int,
711 addr->service_name_len,
712 NFC_LLCP_MAX_SERVICE_NAME);
713 llcp_sock->service_name = kmemdup(addr->service_name,
714 llcp_sock->service_name_len,
715 GFP_KERNEL);
716
717 nfc_llcp_sock_link(&local->connecting_sockets, sk);
718
719 ret = nfc_llcp_send_connect(llcp_sock);
720 if (ret)
721 goto sock_unlink;
722
723 ret = sock_wait_state(sk, LLCP_CONNECTED,
724 sock_sndtimeo(sk, flags & O_NONBLOCK));
725 if (ret)
726 goto sock_unlink;
727
728 release_sock(sk);
729
730 return 0;
731
732sock_unlink:
733 nfc_llcp_put_ssap(local, llcp_sock->ssap);
734
735 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
736
737put_dev:
738 nfc_put_device(dev);
739
740error:
741 release_sock(sk);
742 return ret;
743}
744
745static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
746 struct msghdr *msg, size_t len)
747{
748 struct sock *sk = sock->sk;
749 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
750 int ret;
751
752 pr_debug("sock %p sk %p", sock, sk);
753
754 ret = sock_error(sk);
755 if (ret)
756 return ret;
757
758 if (msg->msg_flags & MSG_OOB)
759 return -EOPNOTSUPP;
760
761 lock_sock(sk);
762
763 if (sk->sk_type == SOCK_DGRAM) {
764 struct sockaddr_nfc_llcp *addr =
765 (struct sockaddr_nfc_llcp *)msg->msg_name;
766
767 if (msg->msg_namelen < sizeof(*addr)) {
768 release_sock(sk);
769 return -EINVAL;
770 }
771
772 release_sock(sk);
773
774 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
775 msg, len);
776 }
777
778 if (sk->sk_state != LLCP_CONNECTED) {
779 release_sock(sk);
780 return -ENOTCONN;
781 }
782
783 release_sock(sk);
784
785 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
786}
787
788static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
789 struct msghdr *msg, size_t len, int flags)
790{
791 int noblock = flags & MSG_DONTWAIT;
792 struct sock *sk = sock->sk;
793 unsigned int copied, rlen;
794 struct sk_buff *skb, *cskb;
795 int err = 0;
796
797 pr_debug("%p %zu\n", sk, len);
798
799 lock_sock(sk);
800
801 if (sk->sk_state == LLCP_CLOSED &&
802 skb_queue_empty(&sk->sk_receive_queue)) {
803 release_sock(sk);
804 return 0;
805 }
806
807 release_sock(sk);
808
809 if (flags & (MSG_OOB))
810 return -EOPNOTSUPP;
811
812 skb = skb_recv_datagram(sk, flags, noblock, &err);
813 if (!skb) {
814 pr_err("Recv datagram failed state %d %d %d",
815 sk->sk_state, err, sock_error(sk));
816
817 if (sk->sk_shutdown & RCV_SHUTDOWN)
818 return 0;
819
820 return err;
821 }
822
823 rlen = skb->len; /* real length of skb */
824 copied = min_t(unsigned int, rlen, len);
825
826 cskb = skb;
827 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
828 if (!(flags & MSG_PEEK))
829 skb_queue_head(&sk->sk_receive_queue, skb);
830 return -EFAULT;
831 }
832
833 sock_recv_timestamp(msg, sk, skb);
834
835 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
836 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
837 struct sockaddr_nfc_llcp *sockaddr =
838 (struct sockaddr_nfc_llcp *) msg->msg_name;
839
840 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
841
842 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
843
844 sockaddr->sa_family = AF_NFC;
845 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
846 sockaddr->dsap = ui_cb->dsap;
847 sockaddr->ssap = ui_cb->ssap;
848 }
849
850 /* Mark read part of skb as used */
851 if (!(flags & MSG_PEEK)) {
852
853 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
854 if (sk->sk_type == SOCK_STREAM ||
855 sk->sk_type == SOCK_DGRAM ||
856 sk->sk_type == SOCK_RAW) {
857 skb_pull(skb, copied);
858 if (skb->len) {
859 skb_queue_head(&sk->sk_receive_queue, skb);
860 goto done;
861 }
862 }
863
864 kfree_skb(skb);
865 }
866
867 /* XXX Queue backlogged skbs */
868
869done:
870 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
871 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
872 copied = rlen;
873
874 return copied;
875}
876
877static const struct proto_ops llcp_sock_ops = {
878 .family = PF_NFC,
879 .owner = THIS_MODULE,
880 .bind = llcp_sock_bind,
881 .connect = llcp_sock_connect,
882 .release = llcp_sock_release,
883 .socketpair = sock_no_socketpair,
884 .accept = llcp_sock_accept,
885 .getname = llcp_sock_getname,
886 .poll = llcp_sock_poll,
887 .ioctl = sock_no_ioctl,
888 .listen = llcp_sock_listen,
889 .shutdown = sock_no_shutdown,
890 .setsockopt = nfc_llcp_setsockopt,
891 .getsockopt = nfc_llcp_getsockopt,
892 .sendmsg = llcp_sock_sendmsg,
893 .recvmsg = llcp_sock_recvmsg,
894 .mmap = sock_no_mmap,
895};
896
897static const struct proto_ops llcp_rawsock_ops = {
898 .family = PF_NFC,
899 .owner = THIS_MODULE,
900 .bind = llcp_raw_sock_bind,
901 .connect = sock_no_connect,
902 .release = llcp_sock_release,
903 .socketpair = sock_no_socketpair,
904 .accept = sock_no_accept,
905 .getname = llcp_sock_getname,
906 .poll = llcp_sock_poll,
907 .ioctl = sock_no_ioctl,
908 .listen = sock_no_listen,
909 .shutdown = sock_no_shutdown,
910 .setsockopt = sock_no_setsockopt,
911 .getsockopt = sock_no_getsockopt,
912 .sendmsg = sock_no_sendmsg,
913 .recvmsg = llcp_sock_recvmsg,
914 .mmap = sock_no_mmap,
915};
916
917static void llcp_sock_destruct(struct sock *sk)
918{
919 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
920
921 pr_debug("%p\n", sk);
922
923 if (sk->sk_state == LLCP_CONNECTED)
924 nfc_put_device(llcp_sock->dev);
925
926 skb_queue_purge(&sk->sk_receive_queue);
927
928 nfc_llcp_sock_free(llcp_sock);
929
930 if (!sock_flag(sk, SOCK_DEAD)) {
931 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
932 return;
933 }
934}
935
936struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
937{
938 struct sock *sk;
939 struct nfc_llcp_sock *llcp_sock;
940
941 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
942 if (!sk)
943 return NULL;
944
945 llcp_sock = nfc_llcp_sock(sk);
946
947 sock_init_data(sock, sk);
948 sk->sk_state = LLCP_CLOSED;
949 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
950 sk->sk_type = type;
951 sk->sk_destruct = llcp_sock_destruct;
952
953 llcp_sock->ssap = 0;
954 llcp_sock->dsap = LLCP_SAP_SDP;
955 llcp_sock->rw = LLCP_MAX_RW + 1;
956 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
957 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
958 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
959 llcp_sock->remote_ready = 1;
960 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
961 nfc_llcp_socket_remote_param_init(llcp_sock);
962 skb_queue_head_init(&llcp_sock->tx_queue);
963 skb_queue_head_init(&llcp_sock->tx_pending_queue);
964 INIT_LIST_HEAD(&llcp_sock->accept_queue);
965
966 if (sock != NULL)
967 sock->state = SS_UNCONNECTED;
968
969 return sk;
970}
971
972void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
973{
974 kfree(sock->service_name);
975
976 skb_queue_purge(&sock->tx_queue);
977 skb_queue_purge(&sock->tx_pending_queue);
978
979 list_del_init(&sock->accept_queue);
980
981 sock->parent = NULL;
982
983 nfc_llcp_local_put(sock->local);
984}
985
986static int llcp_sock_create(struct net *net, struct socket *sock,
987 const struct nfc_protocol *nfc_proto)
988{
989 struct sock *sk;
990
991 pr_debug("%p\n", sock);
992
993 if (sock->type != SOCK_STREAM &&
994 sock->type != SOCK_DGRAM &&
995 sock->type != SOCK_RAW)
996 return -ESOCKTNOSUPPORT;
997
998 if (sock->type == SOCK_RAW)
999 sock->ops = &llcp_rawsock_ops;
1000 else
1001 sock->ops = &llcp_sock_ops;
1002
1003 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
1004 if (sk == NULL)
1005 return -ENOMEM;
1006
1007 return 0;
1008}
1009
1010static const struct nfc_protocol llcp_nfc_proto = {
1011 .id = NFC_SOCKPROTO_LLCP,
1012 .proto = &llcp_sock_proto,
1013 .owner = THIS_MODULE,
1014 .create = llcp_sock_create
1015};
1016
1017int __init nfc_llcp_sock_init(void)
1018{
1019 return nfc_proto_register(&llcp_nfc_proto);
1020}
1021
1022void nfc_llcp_sock_exit(void)
1023{
1024 nfc_proto_unregister(&llcp_nfc_proto);
1025}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 14:24:45 -0500