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