tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 */
5
6#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/nfc.h>
12#include <linux/sched/signal.h>
13
14#include "nfc.h"
15#include "llcp.h"
16
17static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
18{
19 DECLARE_WAITQUEUE(wait, current);
20 int err = 0;
21
22 pr_debug("sk %p", sk);
23
24 add_wait_queue(sk_sleep(sk), &wait);
25 set_current_state(TASK_INTERRUPTIBLE);
26
27 while (sk->sk_state != state) {
28 if (!timeo) {
29 err = -EINPROGRESS;
30 break;
31 }
32
33 if (signal_pending(current)) {
34 err = sock_intr_errno(timeo);
35 break;
36 }
37
38 release_sock(sk);
39 timeo = schedule_timeout(timeo);
40 lock_sock(sk);
41 set_current_state(TASK_INTERRUPTIBLE);
42
43 err = sock_error(sk);
44 if (err)
45 break;
46 }
47
48 __set_current_state(TASK_RUNNING);
49 remove_wait_queue(sk_sleep(sk), &wait);
50 return err;
51}
52
53static struct proto llcp_sock_proto = {
54 .name = "NFC_LLCP",
55 .owner = THIS_MODULE,
56 .obj_size = sizeof(struct nfc_llcp_sock),
57};
58
59static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
60{
61 struct sock *sk = sock->sk;
62 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
63 struct nfc_llcp_local *local;
64 struct nfc_dev *dev;
65 struct sockaddr_nfc_llcp llcp_addr;
66 int len, ret = 0;
67
68 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
69 addr->sa_family != AF_NFC)
70 return -EINVAL;
71
72 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
73
74 memset(&llcp_addr, 0, sizeof(llcp_addr));
75 len = min_t(unsigned int, sizeof(llcp_addr), alen);
76 memcpy(&llcp_addr, addr, len);
77
78 /* This is going to be a listening socket, dsap must be 0 */
79 if (llcp_addr.dsap != 0)
80 return -EINVAL;
81
82 lock_sock(sk);
83
84 if (sk->sk_state != LLCP_CLOSED) {
85 ret = -EBADFD;
86 goto error;
87 }
88
89 dev = nfc_get_device(llcp_addr.dev_idx);
90 if (dev == NULL) {
91 ret = -ENODEV;
92 goto error;
93 }
94
95 local = nfc_llcp_find_local(dev);
96 if (local == NULL) {
97 ret = -ENODEV;
98 goto put_dev;
99 }
100
101 llcp_sock->dev = dev;
102 llcp_sock->local = nfc_llcp_local_get(local);
103 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
104 llcp_sock->service_name_len = min_t(unsigned int,
105 llcp_addr.service_name_len,
106 NFC_LLCP_MAX_SERVICE_NAME);
107 llcp_sock->service_name = kmemdup(llcp_addr.service_name,
108 llcp_sock->service_name_len,
109 GFP_KERNEL);
110 if (!llcp_sock->service_name) {
111 nfc_llcp_local_put(llcp_sock->local);
112 llcp_sock->local = NULL;
113 ret = -ENOMEM;
114 goto put_dev;
115 }
116 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
117 if (llcp_sock->ssap == LLCP_SAP_MAX) {
118 nfc_llcp_local_put(llcp_sock->local);
119 llcp_sock->local = NULL;
120 kfree(llcp_sock->service_name);
121 llcp_sock->service_name = NULL;
122 ret = -EADDRINUSE;
123 goto put_dev;
124 }
125
126 llcp_sock->reserved_ssap = llcp_sock->ssap;
127
128 nfc_llcp_sock_link(&local->sockets, sk);
129
130 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
131
132 sk->sk_state = LLCP_BOUND;
133
134put_dev:
135 nfc_put_device(dev);
136
137error:
138 release_sock(sk);
139 return ret;
140}
141
142static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
143 int alen)
144{
145 struct sock *sk = sock->sk;
146 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
147 struct nfc_llcp_local *local;
148 struct nfc_dev *dev;
149 struct sockaddr_nfc_llcp llcp_addr;
150 int len, ret = 0;
151
152 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
153 addr->sa_family != AF_NFC)
154 return -EINVAL;
155
156 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
157
158 memset(&llcp_addr, 0, sizeof(llcp_addr));
159 len = min_t(unsigned int, sizeof(llcp_addr), alen);
160 memcpy(&llcp_addr, addr, len);
161
162 lock_sock(sk);
163
164 if (sk->sk_state != LLCP_CLOSED) {
165 ret = -EBADFD;
166 goto error;
167 }
168
169 dev = nfc_get_device(llcp_addr.dev_idx);
170 if (dev == NULL) {
171 ret = -ENODEV;
172 goto error;
173 }
174
175 local = nfc_llcp_find_local(dev);
176 if (local == NULL) {
177 ret = -ENODEV;
178 goto put_dev;
179 }
180
181 llcp_sock->dev = dev;
182 llcp_sock->local = nfc_llcp_local_get(local);
183 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
184
185 nfc_llcp_sock_link(&local->raw_sockets, sk);
186
187 sk->sk_state = LLCP_BOUND;
188
189put_dev:
190 nfc_put_device(dev);
191
192error:
193 release_sock(sk);
194 return ret;
195}
196
197static int llcp_sock_listen(struct socket *sock, int backlog)
198{
199 struct sock *sk = sock->sk;
200 int ret = 0;
201
202 pr_debug("sk %p backlog %d\n", sk, backlog);
203
204 lock_sock(sk);
205
206 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
207 sk->sk_state != LLCP_BOUND) {
208 ret = -EBADFD;
209 goto error;
210 }
211
212 sk->sk_max_ack_backlog = backlog;
213 sk->sk_ack_backlog = 0;
214
215 pr_debug("Socket listening\n");
216 sk->sk_state = LLCP_LISTEN;
217
218error:
219 release_sock(sk);
220
221 return ret;
222}
223
224static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
225 sockptr_t optval, unsigned int optlen)
226{
227 struct sock *sk = sock->sk;
228 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
229 u32 opt;
230 int err = 0;
231
232 pr_debug("%p optname %d\n", sk, optname);
233
234 if (level != SOL_NFC)
235 return -ENOPROTOOPT;
236
237 lock_sock(sk);
238
239 switch (optname) {
240 case NFC_LLCP_RW:
241 if (sk->sk_state == LLCP_CONNECTED ||
242 sk->sk_state == LLCP_BOUND ||
243 sk->sk_state == LLCP_LISTEN) {
244 err = -EINVAL;
245 break;
246 }
247
248 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
249 err = -EFAULT;
250 break;
251 }
252
253 if (opt > LLCP_MAX_RW) {
254 err = -EINVAL;
255 break;
256 }
257
258 llcp_sock->rw = (u8) opt;
259
260 break;
261
262 case NFC_LLCP_MIUX:
263 if (sk->sk_state == LLCP_CONNECTED ||
264 sk->sk_state == LLCP_BOUND ||
265 sk->sk_state == LLCP_LISTEN) {
266 err = -EINVAL;
267 break;
268 }
269
270 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
271 err = -EFAULT;
272 break;
273 }
274
275 if (opt > LLCP_MAX_MIUX) {
276 err = -EINVAL;
277 break;
278 }
279
280 llcp_sock->miux = cpu_to_be16((u16) opt);
281
282 break;
283
284 default:
285 err = -ENOPROTOOPT;
286 break;
287 }
288
289 release_sock(sk);
290
291 pr_debug("%p rw %d miux %d\n", llcp_sock,
292 llcp_sock->rw, llcp_sock->miux);
293
294 return err;
295}
296
297static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
298 char __user *optval, int __user *optlen)
299{
300 struct nfc_llcp_local *local;
301 struct sock *sk = sock->sk;
302 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
303 int len, err = 0;
304 u16 miux, remote_miu;
305 u8 rw;
306
307 pr_debug("%p optname %d\n", sk, optname);
308
309 if (level != SOL_NFC)
310 return -ENOPROTOOPT;
311
312 if (get_user(len, optlen))
313 return -EFAULT;
314
315 local = llcp_sock->local;
316 if (!local)
317 return -ENODEV;
318
319 len = min_t(u32, len, sizeof(u32));
320
321 lock_sock(sk);
322
323 switch (optname) {
324 case NFC_LLCP_RW:
325 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
326 if (put_user(rw, (u32 __user *) optval))
327 err = -EFAULT;
328
329 break;
330
331 case NFC_LLCP_MIUX:
332 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
333 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
334
335 if (put_user(miux, (u32 __user *) optval))
336 err = -EFAULT;
337
338 break;
339
340 case NFC_LLCP_REMOTE_MIU:
341 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
342 local->remote_miu : llcp_sock->remote_miu;
343
344 if (put_user(remote_miu, (u32 __user *) optval))
345 err = -EFAULT;
346
347 break;
348
349 case NFC_LLCP_REMOTE_LTO:
350 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
351 err = -EFAULT;
352
353 break;
354
355 case NFC_LLCP_REMOTE_RW:
356 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
357 err = -EFAULT;
358
359 break;
360
361 default:
362 err = -ENOPROTOOPT;
363 break;
364 }
365
366 release_sock(sk);
367
368 if (put_user(len, optlen))
369 return -EFAULT;
370
371 return err;
372}
373
374void nfc_llcp_accept_unlink(struct sock *sk)
375{
376 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
377
378 pr_debug("state %d\n", sk->sk_state);
379
380 list_del_init(&llcp_sock->accept_queue);
381 sk_acceptq_removed(llcp_sock->parent);
382 llcp_sock->parent = NULL;
383
384 sock_put(sk);
385}
386
387void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
388{
389 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
390 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
391
392 /* Lock will be free from unlink */
393 sock_hold(sk);
394
395 list_add_tail(&llcp_sock->accept_queue,
396 &llcp_sock_parent->accept_queue);
397 llcp_sock->parent = parent;
398 sk_acceptq_added(parent);
399}
400
401struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
402 struct socket *newsock)
403{
404 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
405 struct sock *sk;
406
407 llcp_parent = nfc_llcp_sock(parent);
408
409 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
410 accept_queue) {
411 sk = &lsk->sk;
412 lock_sock(sk);
413
414 if (sk->sk_state == LLCP_CLOSED) {
415 release_sock(sk);
416 nfc_llcp_accept_unlink(sk);
417 continue;
418 }
419
420 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
421 list_del_init(&lsk->accept_queue);
422 sock_put(sk);
423
424 if (newsock)
425 sock_graft(sk, newsock);
426
427 release_sock(sk);
428
429 pr_debug("Returning sk state %d\n", sk->sk_state);
430
431 sk_acceptq_removed(parent);
432
433 return sk;
434 }
435
436 release_sock(sk);
437 }
438
439 return NULL;
440}
441
442static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
443 int flags, bool kern)
444{
445 DECLARE_WAITQUEUE(wait, current);
446 struct sock *sk = sock->sk, *new_sk;
447 long timeo;
448 int ret = 0;
449
450 pr_debug("parent %p\n", sk);
451
452 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
453
454 if (sk->sk_state != LLCP_LISTEN) {
455 ret = -EBADFD;
456 goto error;
457 }
458
459 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
460
461 /* Wait for an incoming connection. */
462 add_wait_queue_exclusive(sk_sleep(sk), &wait);
463 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
464 set_current_state(TASK_INTERRUPTIBLE);
465
466 if (!timeo) {
467 ret = -EAGAIN;
468 break;
469 }
470
471 if (signal_pending(current)) {
472 ret = sock_intr_errno(timeo);
473 break;
474 }
475
476 release_sock(sk);
477 timeo = schedule_timeout(timeo);
478 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
479 }
480 __set_current_state(TASK_RUNNING);
481 remove_wait_queue(sk_sleep(sk), &wait);
482
483 if (ret)
484 goto error;
485
486 newsock->state = SS_CONNECTED;
487
488 pr_debug("new socket %p\n", new_sk);
489
490error:
491 release_sock(sk);
492
493 return ret;
494}
495
496static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
497 int peer)
498{
499 struct sock *sk = sock->sk;
500 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
501 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
502
503 if (llcp_sock == NULL || llcp_sock->dev == NULL)
504 return -EBADFD;
505
506 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
507 llcp_sock->dsap, llcp_sock->ssap);
508
509 memset(llcp_addr, 0, sizeof(*llcp_addr));
510
511 lock_sock(sk);
512 if (!llcp_sock->dev) {
513 release_sock(sk);
514 return -EBADFD;
515 }
516 llcp_addr->sa_family = AF_NFC;
517 llcp_addr->dev_idx = llcp_sock->dev->idx;
518 llcp_addr->target_idx = llcp_sock->target_idx;
519 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
520 llcp_addr->dsap = llcp_sock->dsap;
521 llcp_addr->ssap = llcp_sock->ssap;
522 llcp_addr->service_name_len = llcp_sock->service_name_len;
523 memcpy(llcp_addr->service_name, llcp_sock->service_name,
524 llcp_addr->service_name_len);
525 release_sock(sk);
526
527 return sizeof(struct sockaddr_nfc_llcp);
528}
529
530static inline __poll_t llcp_accept_poll(struct sock *parent)
531{
532 struct nfc_llcp_sock *llcp_sock, *parent_sock;
533 struct sock *sk;
534
535 parent_sock = nfc_llcp_sock(parent);
536
537 list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
538 accept_queue) {
539 sk = &llcp_sock->sk;
540
541 if (sk->sk_state == LLCP_CONNECTED)
542 return EPOLLIN | EPOLLRDNORM;
543 }
544
545 return 0;
546}
547
548static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
549 poll_table *wait)
550{
551 struct sock *sk = sock->sk;
552 __poll_t mask = 0;
553
554 pr_debug("%p\n", sk);
555
556 sock_poll_wait(file, sock, wait);
557
558 if (sk->sk_state == LLCP_LISTEN)
559 return llcp_accept_poll(sk);
560
561 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
562 mask |= EPOLLERR |
563 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
564
565 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
566 mask |= EPOLLIN | EPOLLRDNORM;
567
568 if (sk->sk_state == LLCP_CLOSED)
569 mask |= EPOLLHUP;
570
571 if (sk->sk_shutdown & RCV_SHUTDOWN)
572 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
573
574 if (sk->sk_shutdown == SHUTDOWN_MASK)
575 mask |= EPOLLHUP;
576
577 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
578 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
579 else
580 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
581
582 pr_debug("mask 0x%x\n", mask);
583
584 return mask;
585}
586
587static int llcp_sock_release(struct socket *sock)
588{
589 struct sock *sk = sock->sk;
590 struct nfc_llcp_local *local;
591 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
592 int err = 0;
593
594 if (!sk)
595 return 0;
596
597 pr_debug("%p\n", sk);
598
599 local = llcp_sock->local;
600 if (local == NULL) {
601 err = -ENODEV;
602 goto out;
603 }
604
605 lock_sock(sk);
606
607 /* Send a DISC */
608 if (sk->sk_state == LLCP_CONNECTED)
609 nfc_llcp_send_disconnect(llcp_sock);
610
611 if (sk->sk_state == LLCP_LISTEN) {
612 struct nfc_llcp_sock *lsk, *n;
613 struct sock *accept_sk;
614
615 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
616 accept_queue) {
617 accept_sk = &lsk->sk;
618 lock_sock(accept_sk);
619
620 nfc_llcp_send_disconnect(lsk);
621 nfc_llcp_accept_unlink(accept_sk);
622
623 release_sock(accept_sk);
624 }
625 }
626
627 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
628 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
629
630 release_sock(sk);
631
632 /* Keep this sock alive and therefore do not remove it from the sockets
633 * list until the DISC PDU has been actually sent. Otherwise we would
634 * reply with DM PDUs before sending the DISC one.
635 */
636 if (sk->sk_state == LLCP_DISCONNECTING)
637 return err;
638
639 if (sock->type == SOCK_RAW)
640 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
641 else
642 nfc_llcp_sock_unlink(&local->sockets, sk);
643
644out:
645 sock_orphan(sk);
646 sock_put(sk);
647
648 return err;
649}
650
651static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
652 int len, int flags)
653{
654 struct sock *sk = sock->sk;
655 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
656 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
657 struct nfc_dev *dev;
658 struct nfc_llcp_local *local;
659 int ret = 0;
660
661 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
662
663 if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
664 return -EINVAL;
665
666 if (addr->service_name_len == 0 && addr->dsap == 0)
667 return -EINVAL;
668
669 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
670 addr->target_idx, addr->nfc_protocol);
671
672 lock_sock(sk);
673
674 if (sk->sk_state == LLCP_CONNECTED) {
675 ret = -EISCONN;
676 goto error;
677 }
678 if (sk->sk_state == LLCP_CONNECTING) {
679 ret = -EINPROGRESS;
680 goto error;
681 }
682
683 dev = nfc_get_device(addr->dev_idx);
684 if (dev == NULL) {
685 ret = -ENODEV;
686 goto error;
687 }
688
689 local = nfc_llcp_find_local(dev);
690 if (local == NULL) {
691 ret = -ENODEV;
692 goto put_dev;
693 }
694
695 device_lock(&dev->dev);
696 if (dev->dep_link_up == false) {
697 ret = -ENOLINK;
698 device_unlock(&dev->dev);
699 goto put_dev;
700 }
701 device_unlock(&dev->dev);
702
703 if (local->rf_mode == NFC_RF_INITIATOR &&
704 addr->target_idx != local->target_idx) {
705 ret = -ENOLINK;
706 goto put_dev;
707 }
708
709 llcp_sock->dev = dev;
710 llcp_sock->local = nfc_llcp_local_get(local);
711 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
712 if (llcp_sock->ssap == LLCP_SAP_MAX) {
713 nfc_llcp_local_put(llcp_sock->local);
714 llcp_sock->local = NULL;
715 ret = -ENOMEM;
716 goto put_dev;
717 }
718
719 llcp_sock->reserved_ssap = llcp_sock->ssap;
720
721 if (addr->service_name_len == 0)
722 llcp_sock->dsap = addr->dsap;
723 else
724 llcp_sock->dsap = LLCP_SAP_SDP;
725 llcp_sock->nfc_protocol = addr->nfc_protocol;
726 llcp_sock->service_name_len = min_t(unsigned int,
727 addr->service_name_len,
728 NFC_LLCP_MAX_SERVICE_NAME);
729 llcp_sock->service_name = kmemdup(addr->service_name,
730 llcp_sock->service_name_len,
731 GFP_KERNEL);
732 if (!llcp_sock->service_name) {
733 ret = -ENOMEM;
734 goto sock_llcp_release;
735 }
736
737 nfc_llcp_sock_link(&local->connecting_sockets, sk);
738
739 ret = nfc_llcp_send_connect(llcp_sock);
740 if (ret)
741 goto sock_unlink;
742
743 sk->sk_state = LLCP_CONNECTING;
744
745 ret = sock_wait_state(sk, LLCP_CONNECTED,
746 sock_sndtimeo(sk, flags & O_NONBLOCK));
747 if (ret && ret != -EINPROGRESS)
748 goto sock_unlink;
749
750 release_sock(sk);
751
752 return ret;
753
754sock_unlink:
755 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
756 kfree(llcp_sock->service_name);
757 llcp_sock->service_name = NULL;
758
759sock_llcp_release:
760 nfc_llcp_put_ssap(local, llcp_sock->ssap);
761 nfc_llcp_local_put(llcp_sock->local);
762 llcp_sock->local = NULL;
763
764put_dev:
765 nfc_put_device(dev);
766
767error:
768 release_sock(sk);
769 return ret;
770}
771
772static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
773 size_t len)
774{
775 struct sock *sk = sock->sk;
776 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
777 int ret;
778
779 pr_debug("sock %p sk %p", sock, sk);
780
781 ret = sock_error(sk);
782 if (ret)
783 return ret;
784
785 if (msg->msg_flags & MSG_OOB)
786 return -EOPNOTSUPP;
787
788 lock_sock(sk);
789
790 if (sk->sk_type == SOCK_DGRAM) {
791 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
792 msg->msg_name);
793
794 if (msg->msg_namelen < sizeof(*addr)) {
795 release_sock(sk);
796 return -EINVAL;
797 }
798
799 release_sock(sk);
800
801 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
802 msg, len);
803 }
804
805 if (sk->sk_state != LLCP_CONNECTED) {
806 release_sock(sk);
807 return -ENOTCONN;
808 }
809
810 release_sock(sk);
811
812 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
813}
814
815static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
816 size_t len, int flags)
817{
818 int noblock = flags & MSG_DONTWAIT;
819 struct sock *sk = sock->sk;
820 unsigned int copied, rlen;
821 struct sk_buff *skb, *cskb;
822 int err = 0;
823
824 pr_debug("%p %zu\n", sk, len);
825
826 lock_sock(sk);
827
828 if (sk->sk_state == LLCP_CLOSED &&
829 skb_queue_empty(&sk->sk_receive_queue)) {
830 release_sock(sk);
831 return 0;
832 }
833
834 release_sock(sk);
835
836 if (flags & (MSG_OOB))
837 return -EOPNOTSUPP;
838
839 skb = skb_recv_datagram(sk, flags, noblock, &err);
840 if (!skb) {
841 pr_err("Recv datagram failed state %d %d %d",
842 sk->sk_state, err, sock_error(sk));
843
844 if (sk->sk_shutdown & RCV_SHUTDOWN)
845 return 0;
846
847 return err;
848 }
849
850 rlen = skb->len; /* real length of skb */
851 copied = min_t(unsigned int, rlen, len);
852
853 cskb = skb;
854 if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
855 if (!(flags & MSG_PEEK))
856 skb_queue_head(&sk->sk_receive_queue, skb);
857 return -EFAULT;
858 }
859
860 sock_recv_timestamp(msg, sk, skb);
861
862 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
863 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
864 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
865 msg->msg_name);
866
867 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
868
869 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
870
871 memset(sockaddr, 0, sizeof(*sockaddr));
872 sockaddr->sa_family = AF_NFC;
873 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
874 sockaddr->dsap = ui_cb->dsap;
875 sockaddr->ssap = ui_cb->ssap;
876 }
877
878 /* Mark read part of skb as used */
879 if (!(flags & MSG_PEEK)) {
880
881 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
882 if (sk->sk_type == SOCK_STREAM ||
883 sk->sk_type == SOCK_DGRAM ||
884 sk->sk_type == SOCK_RAW) {
885 skb_pull(skb, copied);
886 if (skb->len) {
887 skb_queue_head(&sk->sk_receive_queue, skb);
888 goto done;
889 }
890 }
891
892 kfree_skb(skb);
893 }
894
895 /* XXX Queue backlogged skbs */
896
897done:
898 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
899 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
900 copied = rlen;
901
902 return copied;
903}
904
905static const struct proto_ops llcp_sock_ops = {
906 .family = PF_NFC,
907 .owner = THIS_MODULE,
908 .bind = llcp_sock_bind,
909 .connect = llcp_sock_connect,
910 .release = llcp_sock_release,
911 .socketpair = sock_no_socketpair,
912 .accept = llcp_sock_accept,
913 .getname = llcp_sock_getname,
914 .poll = llcp_sock_poll,
915 .ioctl = sock_no_ioctl,
916 .listen = llcp_sock_listen,
917 .shutdown = sock_no_shutdown,
918 .setsockopt = nfc_llcp_setsockopt,
919 .getsockopt = nfc_llcp_getsockopt,
920 .sendmsg = llcp_sock_sendmsg,
921 .recvmsg = llcp_sock_recvmsg,
922 .mmap = sock_no_mmap,
923};
924
925static const struct proto_ops llcp_rawsock_ops = {
926 .family = PF_NFC,
927 .owner = THIS_MODULE,
928 .bind = llcp_raw_sock_bind,
929 .connect = sock_no_connect,
930 .release = llcp_sock_release,
931 .socketpair = sock_no_socketpair,
932 .accept = sock_no_accept,
933 .getname = llcp_sock_getname,
934 .poll = llcp_sock_poll,
935 .ioctl = sock_no_ioctl,
936 .listen = sock_no_listen,
937 .shutdown = sock_no_shutdown,
938 .sendmsg = sock_no_sendmsg,
939 .recvmsg = llcp_sock_recvmsg,
940 .mmap = sock_no_mmap,
941};
942
943static void llcp_sock_destruct(struct sock *sk)
944{
945 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
946
947 pr_debug("%p\n", sk);
948
949 if (sk->sk_state == LLCP_CONNECTED)
950 nfc_put_device(llcp_sock->dev);
951
952 skb_queue_purge(&sk->sk_receive_queue);
953
954 nfc_llcp_sock_free(llcp_sock);
955
956 if (!sock_flag(sk, SOCK_DEAD)) {
957 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
958 return;
959 }
960}
961
962struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
963{
964 struct sock *sk;
965 struct nfc_llcp_sock *llcp_sock;
966
967 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
968 if (!sk)
969 return NULL;
970
971 llcp_sock = nfc_llcp_sock(sk);
972
973 sock_init_data(sock, sk);
974 sk->sk_state = LLCP_CLOSED;
975 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
976 sk->sk_type = type;
977 sk->sk_destruct = llcp_sock_destruct;
978
979 llcp_sock->ssap = 0;
980 llcp_sock->dsap = LLCP_SAP_SDP;
981 llcp_sock->rw = LLCP_MAX_RW + 1;
982 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
983 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
984 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
985 llcp_sock->remote_ready = 1;
986 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
987 nfc_llcp_socket_remote_param_init(llcp_sock);
988 skb_queue_head_init(&llcp_sock->tx_queue);
989 skb_queue_head_init(&llcp_sock->tx_pending_queue);
990 INIT_LIST_HEAD(&llcp_sock->accept_queue);
991
992 if (sock != NULL)
993 sock->state = SS_UNCONNECTED;
994
995 return sk;
996}
997
998void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
999{
1000 kfree(sock->service_name);
1001
1002 skb_queue_purge(&sock->tx_queue);
1003 skb_queue_purge(&sock->tx_pending_queue);
1004
1005 list_del_init(&sock->accept_queue);
1006
1007 sock->parent = NULL;
1008
1009 nfc_llcp_local_put(sock->local);
1010}
1011
1012static int llcp_sock_create(struct net *net, struct socket *sock,
1013 const struct nfc_protocol *nfc_proto, int kern)
1014{
1015 struct sock *sk;
1016
1017 pr_debug("%p\n", sock);
1018
1019 if (sock->type != SOCK_STREAM &&
1020 sock->type != SOCK_DGRAM &&
1021 sock->type != SOCK_RAW)
1022 return -ESOCKTNOSUPPORT;
1023
1024 if (sock->type == SOCK_RAW) {
1025 if (!capable(CAP_NET_RAW))
1026 return -EPERM;
1027 sock->ops = &llcp_rawsock_ops;
1028 } else {
1029 sock->ops = &llcp_sock_ops;
1030 }
1031
1032 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1033 if (sk == NULL)
1034 return -ENOMEM;
1035
1036 return 0;
1037}
1038
1039static const struct nfc_protocol llcp_nfc_proto = {
1040 .id = NFC_SOCKPROTO_LLCP,
1041 .proto = &llcp_sock_proto,
1042 .owner = THIS_MODULE,
1043 .create = llcp_sock_create
1044};
1045
1046int __init nfc_llcp_sock_init(void)
1047{
1048 return nfc_proto_register(&llcp_nfc_proto);
1049}
1050
1051void nfc_llcp_sock_exit(void)
1052{
1053 nfc_proto_unregister(&llcp_nfc_proto);
1054}