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authorJohn W. Linville <linville@tuxdriver.com>2013-04-29 15:31:57 -0400
committerJohn W. Linville <linville@tuxdriver.com>2013-04-29 15:31:57 -0400
commit17a2911f3395d66694fcbd2e8970015904d9b034 (patch)
treec93e40197d4614b5183f86f0335c5c7abcee31aa /net/nfc/llcp_sock.c
parent94dace10142790ddeb0a3a7b8b33d9540d30c79f (diff)
parenta8a48e60a468084ef6ec23c78e8903c9e0ba7a4c (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem
Diffstat (limited to 'net/nfc/llcp_sock.c')
-rw-r--r--net/nfc/llcp_sock.c1029
1 files changed, 1029 insertions, 0 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
new file mode 100644
index 000000000000..38f08c31cdd8
--- /dev/null
+++ b/net/nfc/llcp_sock.c
@@ -0,0 +1,1029 @@
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 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
560
561 if (!skb_queue_empty(&sk->sk_receive_queue))
562 mask |= POLLIN | POLLRDNORM;
563
564 if (sk->sk_state == LLCP_CLOSED)
565 mask |= POLLHUP;
566
567 if (sk->sk_shutdown & RCV_SHUTDOWN)
568 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
569
570 if (sk->sk_shutdown == SHUTDOWN_MASK)
571 mask |= POLLHUP;
572
573 if (sock_writeable(sk))
574 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
575 else
576 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
577
578 pr_debug("mask 0x%x\n", mask);
579
580 return mask;
581}
582
583static int llcp_sock_release(struct socket *sock)
584{
585 struct sock *sk = sock->sk;
586 struct nfc_llcp_local *local;
587 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
588 int err = 0;
589
590 if (!sk)
591 return 0;
592
593 pr_debug("%p\n", sk);
594
595 local = llcp_sock->local;
596 if (local == NULL) {
597 err = -ENODEV;
598 goto out;
599 }
600
601 lock_sock(sk);
602
603 /* Send a DISC */
604 if (sk->sk_state == LLCP_CONNECTED)
605 nfc_llcp_disconnect(llcp_sock);
606
607 if (sk->sk_state == LLCP_LISTEN) {
608 struct nfc_llcp_sock *lsk, *n;
609 struct sock *accept_sk;
610
611 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
612 accept_queue) {
613 accept_sk = &lsk->sk;
614 lock_sock(accept_sk);
615
616 nfc_llcp_disconnect(lsk);
617 nfc_llcp_accept_unlink(accept_sk);
618
619 release_sock(accept_sk);
620 }
621 }
622
623 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
624 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
625
626 release_sock(sk);
627
628 if (sock->type == SOCK_RAW)
629 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
630 else
631 nfc_llcp_sock_unlink(&local->sockets, sk);
632
633out:
634 sock_orphan(sk);
635 sock_put(sk);
636
637 return err;
638}
639
640static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
641 int len, int flags)
642{
643 struct sock *sk = sock->sk;
644 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
645 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
646 struct nfc_dev *dev;
647 struct nfc_llcp_local *local;
648 int ret = 0;
649
650 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
651
652 if (!addr || len < sizeof(struct sockaddr_nfc) ||
653 addr->sa_family != AF_NFC)
654 return -EINVAL;
655
656 if (addr->service_name_len == 0 && addr->dsap == 0)
657 return -EINVAL;
658
659 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
660 addr->target_idx, addr->nfc_protocol);
661
662 lock_sock(sk);
663
664 if (sk->sk_state == LLCP_CONNECTED) {
665 ret = -EISCONN;
666 goto error;
667 }
668
669 dev = nfc_get_device(addr->dev_idx);
670 if (dev == NULL) {
671 ret = -ENODEV;
672 goto error;
673 }
674
675 local = nfc_llcp_find_local(dev);
676 if (local == NULL) {
677 ret = -ENODEV;
678 goto put_dev;
679 }
680
681 device_lock(&dev->dev);
682 if (dev->dep_link_up == false) {
683 ret = -ENOLINK;
684 device_unlock(&dev->dev);
685 goto put_dev;
686 }
687 device_unlock(&dev->dev);
688
689 if (local->rf_mode == NFC_RF_INITIATOR &&
690 addr->target_idx != local->target_idx) {
691 ret = -ENOLINK;
692 goto put_dev;
693 }
694
695 llcp_sock->dev = dev;
696 llcp_sock->local = nfc_llcp_local_get(local);
697 llcp_sock->remote_miu = llcp_sock->local->remote_miu;
698 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
699 if (llcp_sock->ssap == LLCP_SAP_MAX) {
700 ret = -ENOMEM;
701 goto put_dev;
702 }
703
704 llcp_sock->reserved_ssap = llcp_sock->ssap;
705
706 if (addr->service_name_len == 0)
707 llcp_sock->dsap = addr->dsap;
708 else
709 llcp_sock->dsap = LLCP_SAP_SDP;
710 llcp_sock->nfc_protocol = addr->nfc_protocol;
711 llcp_sock->service_name_len = min_t(unsigned int,
712 addr->service_name_len,
713 NFC_LLCP_MAX_SERVICE_NAME);
714 llcp_sock->service_name = kmemdup(addr->service_name,
715 llcp_sock->service_name_len,
716 GFP_KERNEL);
717
718 nfc_llcp_sock_link(&local->connecting_sockets, sk);
719
720 ret = nfc_llcp_send_connect(llcp_sock);
721 if (ret)
722 goto sock_unlink;
723
724 ret = sock_wait_state(sk, LLCP_CONNECTED,
725 sock_sndtimeo(sk, flags & O_NONBLOCK));
726 if (ret)
727 goto sock_unlink;
728
729 release_sock(sk);
730
731 return 0;
732
733sock_unlink:
734 nfc_llcp_put_ssap(local, llcp_sock->ssap);
735
736 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
737
738put_dev:
739 nfc_put_device(dev);
740
741error:
742 release_sock(sk);
743 return ret;
744}
745
746static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
747 struct msghdr *msg, size_t len)
748{
749 struct sock *sk = sock->sk;
750 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
751 int ret;
752
753 pr_debug("sock %p sk %p", sock, sk);
754
755 ret = sock_error(sk);
756 if (ret)
757 return ret;
758
759 if (msg->msg_flags & MSG_OOB)
760 return -EOPNOTSUPP;
761
762 lock_sock(sk);
763
764 if (sk->sk_type == SOCK_DGRAM) {
765 struct sockaddr_nfc_llcp *addr =
766 (struct sockaddr_nfc_llcp *)msg->msg_name;
767
768 if (msg->msg_namelen < sizeof(*addr)) {
769 release_sock(sk);
770 return -EINVAL;
771 }
772
773 release_sock(sk);
774
775 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
776 msg, len);
777 }
778
779 if (sk->sk_state != LLCP_CONNECTED) {
780 release_sock(sk);
781 return -ENOTCONN;
782 }
783
784 release_sock(sk);
785
786 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
787}
788
789static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
790 struct msghdr *msg, size_t len, int flags)
791{
792 int noblock = flags & MSG_DONTWAIT;
793 struct sock *sk = sock->sk;
794 unsigned int copied, rlen;
795 struct sk_buff *skb, *cskb;
796 int err = 0;
797
798 pr_debug("%p %zu\n", sk, len);
799
800 msg->msg_namelen = 0;
801
802 lock_sock(sk);
803
804 if (sk->sk_state == LLCP_CLOSED &&
805 skb_queue_empty(&sk->sk_receive_queue)) {
806 release_sock(sk);
807 return 0;
808 }
809
810 release_sock(sk);
811
812 if (flags & (MSG_OOB))
813 return -EOPNOTSUPP;
814
815 skb = skb_recv_datagram(sk, flags, noblock, &err);
816 if (!skb) {
817 pr_err("Recv datagram failed state %d %d %d",
818 sk->sk_state, err, sock_error(sk));
819
820 if (sk->sk_shutdown & RCV_SHUTDOWN)
821 return 0;
822
823 return err;
824 }
825
826 rlen = skb->len; /* real length of skb */
827 copied = min_t(unsigned int, rlen, len);
828
829 cskb = skb;
830 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
831 if (!(flags & MSG_PEEK))
832 skb_queue_head(&sk->sk_receive_queue, skb);
833 return -EFAULT;
834 }
835
836 sock_recv_timestamp(msg, sk, skb);
837
838 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
839 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
840 struct sockaddr_nfc_llcp *sockaddr =
841 (struct sockaddr_nfc_llcp *) msg->msg_name;
842
843 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
844
845 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
846
847 memset(sockaddr, 0, sizeof(*sockaddr));
848 sockaddr->sa_family = AF_NFC;
849 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
850 sockaddr->dsap = ui_cb->dsap;
851 sockaddr->ssap = ui_cb->ssap;
852 }
853
854 /* Mark read part of skb as used */
855 if (!(flags & MSG_PEEK)) {
856
857 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
858 if (sk->sk_type == SOCK_STREAM ||
859 sk->sk_type == SOCK_DGRAM ||
860 sk->sk_type == SOCK_RAW) {
861 skb_pull(skb, copied);
862 if (skb->len) {
863 skb_queue_head(&sk->sk_receive_queue, skb);
864 goto done;
865 }
866 }
867
868 kfree_skb(skb);
869 }
870
871 /* XXX Queue backlogged skbs */
872
873done:
874 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
875 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
876 copied = rlen;
877
878 return copied;
879}
880
881static const struct proto_ops llcp_sock_ops = {
882 .family = PF_NFC,
883 .owner = THIS_MODULE,
884 .bind = llcp_sock_bind,
885 .connect = llcp_sock_connect,
886 .release = llcp_sock_release,
887 .socketpair = sock_no_socketpair,
888 .accept = llcp_sock_accept,
889 .getname = llcp_sock_getname,
890 .poll = llcp_sock_poll,
891 .ioctl = sock_no_ioctl,
892 .listen = llcp_sock_listen,
893 .shutdown = sock_no_shutdown,
894 .setsockopt = nfc_llcp_setsockopt,
895 .getsockopt = nfc_llcp_getsockopt,
896 .sendmsg = llcp_sock_sendmsg,
897 .recvmsg = llcp_sock_recvmsg,
898 .mmap = sock_no_mmap,
899};
900
901static const struct proto_ops llcp_rawsock_ops = {
902 .family = PF_NFC,
903 .owner = THIS_MODULE,
904 .bind = llcp_raw_sock_bind,
905 .connect = sock_no_connect,
906 .release = llcp_sock_release,
907 .socketpair = sock_no_socketpair,
908 .accept = sock_no_accept,
909 .getname = llcp_sock_getname,
910 .poll = llcp_sock_poll,
911 .ioctl = sock_no_ioctl,
912 .listen = sock_no_listen,
913 .shutdown = sock_no_shutdown,
914 .setsockopt = sock_no_setsockopt,
915 .getsockopt = sock_no_getsockopt,
916 .sendmsg = sock_no_sendmsg,
917 .recvmsg = llcp_sock_recvmsg,
918 .mmap = sock_no_mmap,
919};
920
921static void llcp_sock_destruct(struct sock *sk)
922{
923 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
924
925 pr_debug("%p\n", sk);
926
927 if (sk->sk_state == LLCP_CONNECTED)
928 nfc_put_device(llcp_sock->dev);
929
930 skb_queue_purge(&sk->sk_receive_queue);
931
932 nfc_llcp_sock_free(llcp_sock);
933
934 if (!sock_flag(sk, SOCK_DEAD)) {
935 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
936 return;
937 }
938}
939
940struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
941{
942 struct sock *sk;
943 struct nfc_llcp_sock *llcp_sock;
944
945 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
946 if (!sk)
947 return NULL;
948
949 llcp_sock = nfc_llcp_sock(sk);
950
951 sock_init_data(sock, sk);
952 sk->sk_state = LLCP_CLOSED;
953 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
954 sk->sk_type = type;
955 sk->sk_destruct = llcp_sock_destruct;
956
957 llcp_sock->ssap = 0;
958 llcp_sock->dsap = LLCP_SAP_SDP;
959 llcp_sock->rw = LLCP_MAX_RW + 1;
960 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
961 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
962 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
963 llcp_sock->remote_ready = 1;
964 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
965 nfc_llcp_socket_remote_param_init(llcp_sock);
966 skb_queue_head_init(&llcp_sock->tx_queue);
967 skb_queue_head_init(&llcp_sock->tx_pending_queue);
968 INIT_LIST_HEAD(&llcp_sock->accept_queue);
969
970 if (sock != NULL)
971 sock->state = SS_UNCONNECTED;
972
973 return sk;
974}
975
976void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
977{
978 kfree(sock->service_name);
979
980 skb_queue_purge(&sock->tx_queue);
981 skb_queue_purge(&sock->tx_pending_queue);
982
983 list_del_init(&sock->accept_queue);
984
985 sock->parent = NULL;
986
987 nfc_llcp_local_put(sock->local);
988}
989
990static int llcp_sock_create(struct net *net, struct socket *sock,
991 const struct nfc_protocol *nfc_proto)
992{
993 struct sock *sk;
994
995 pr_debug("%p\n", sock);
996
997 if (sock->type != SOCK_STREAM &&
998 sock->type != SOCK_DGRAM &&
999 sock->type != SOCK_RAW)
1000 return -ESOCKTNOSUPPORT;
1001
1002 if (sock->type == SOCK_RAW)
1003 sock->ops = &llcp_rawsock_ops;
1004 else
1005 sock->ops = &llcp_sock_ops;
1006
1007 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
1008 if (sk == NULL)
1009 return -ENOMEM;
1010
1011 return 0;
1012}
1013
1014static const struct nfc_protocol llcp_nfc_proto = {
1015 .id = NFC_SOCKPROTO_LLCP,
1016 .proto = &llcp_sock_proto,
1017 .owner = THIS_MODULE,
1018 .create = llcp_sock_create
1019};
1020
1021int __init nfc_llcp_sock_init(void)
1022{
1023 return nfc_proto_register(&llcp_nfc_proto);
1024}
1025
1026void nfc_llcp_sock_exit(void)
1027{
1028 nfc_proto_unregister(&llcp_nfc_proto);
1029}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 04:19:28 -0500