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
sock_wait_state(struct sock * sk,int state,unsigned long timeo)17 static 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
53 static struct proto llcp_sock_proto = {
54 .name = "NFC_LLCP",
55 .owner = THIS_MODULE,
56 .obj_size = sizeof(struct nfc_llcp_sock),
57 };
58
llcp_sock_bind(struct socket * sock,struct sockaddr * addr,int alen)59 static 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 = 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 sock_llcp_put_local;
113 }
114 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
115 if (llcp_sock->ssap == LLCP_SAP_MAX) {
116 ret = -EADDRINUSE;
117 goto free_service_name;
118 }
119
120 llcp_sock->reserved_ssap = llcp_sock->ssap;
121
122 nfc_llcp_sock_link(&local->sockets, sk);
123
124 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
125
126 sk->sk_state = LLCP_BOUND;
127 nfc_put_device(dev);
128 release_sock(sk);
129
130 return 0;
131
132 free_service_name:
133 kfree(llcp_sock->service_name);
134 llcp_sock->service_name = NULL;
135
136 sock_llcp_put_local:
137 nfc_llcp_local_put(llcp_sock->local);
138 llcp_sock->local = NULL;
139 llcp_sock->dev = NULL;
140
141 put_dev:
142 nfc_put_device(dev);
143
144 error:
145 release_sock(sk);
146 return ret;
147 }
148
llcp_raw_sock_bind(struct socket * sock,struct sockaddr * addr,int alen)149 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
150 int alen)
151 {
152 struct sock *sk = sock->sk;
153 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
154 struct nfc_llcp_local *local;
155 struct nfc_dev *dev;
156 struct sockaddr_nfc_llcp llcp_addr;
157 int len, ret = 0;
158
159 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
160 addr->sa_family != AF_NFC)
161 return -EINVAL;
162
163 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
164
165 memset(&llcp_addr, 0, sizeof(llcp_addr));
166 len = min_t(unsigned int, sizeof(llcp_addr), alen);
167 memcpy(&llcp_addr, addr, len);
168
169 lock_sock(sk);
170
171 if (sk->sk_state != LLCP_CLOSED) {
172 ret = -EBADFD;
173 goto error;
174 }
175
176 dev = nfc_get_device(llcp_addr.dev_idx);
177 if (dev == NULL) {
178 ret = -ENODEV;
179 goto error;
180 }
181
182 local = nfc_llcp_find_local(dev);
183 if (local == NULL) {
184 ret = -ENODEV;
185 goto put_dev;
186 }
187
188 llcp_sock->dev = dev;
189 llcp_sock->local = local;
190 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
191
192 nfc_llcp_sock_link(&local->raw_sockets, sk);
193
194 sk->sk_state = LLCP_BOUND;
195
196 put_dev:
197 nfc_put_device(dev);
198
199 error:
200 release_sock(sk);
201 return ret;
202 }
203
llcp_sock_listen(struct socket * sock,int backlog)204 static int llcp_sock_listen(struct socket *sock, int backlog)
205 {
206 struct sock *sk = sock->sk;
207 int ret = 0;
208
209 pr_debug("sk %p backlog %d\n", sk, backlog);
210
211 lock_sock(sk);
212
213 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
214 sk->sk_state != LLCP_BOUND) {
215 ret = -EBADFD;
216 goto error;
217 }
218
219 sk->sk_max_ack_backlog = backlog;
220 sk->sk_ack_backlog = 0;
221
222 pr_debug("Socket listening\n");
223 sk->sk_state = LLCP_LISTEN;
224
225 error:
226 release_sock(sk);
227
228 return ret;
229 }
230
nfc_llcp_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)231 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
232 sockptr_t optval, unsigned int optlen)
233 {
234 struct sock *sk = sock->sk;
235 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
236 u32 opt;
237 int err = 0;
238
239 pr_debug("%p optname %d\n", sk, optname);
240
241 if (level != SOL_NFC)
242 return -ENOPROTOOPT;
243
244 lock_sock(sk);
245
246 switch (optname) {
247 case NFC_LLCP_RW:
248 if (sk->sk_state == LLCP_CONNECTED ||
249 sk->sk_state == LLCP_BOUND ||
250 sk->sk_state == LLCP_LISTEN) {
251 err = -EINVAL;
252 break;
253 }
254
255 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
256 err = -EFAULT;
257 break;
258 }
259
260 if (opt > LLCP_MAX_RW) {
261 err = -EINVAL;
262 break;
263 }
264
265 llcp_sock->rw = (u8) opt;
266
267 break;
268
269 case NFC_LLCP_MIUX:
270 if (sk->sk_state == LLCP_CONNECTED ||
271 sk->sk_state == LLCP_BOUND ||
272 sk->sk_state == LLCP_LISTEN) {
273 err = -EINVAL;
274 break;
275 }
276
277 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
278 err = -EFAULT;
279 break;
280 }
281
282 if (opt > LLCP_MAX_MIUX) {
283 err = -EINVAL;
284 break;
285 }
286
287 llcp_sock->miux = cpu_to_be16((u16) opt);
288
289 break;
290
291 default:
292 err = -ENOPROTOOPT;
293 break;
294 }
295
296 release_sock(sk);
297
298 pr_debug("%p rw %d miux %d\n", llcp_sock,
299 llcp_sock->rw, llcp_sock->miux);
300
301 return err;
302 }
303
nfc_llcp_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)304 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
305 char __user *optval, int __user *optlen)
306 {
307 struct nfc_llcp_local *local;
308 struct sock *sk = sock->sk;
309 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
310 int len, err = 0;
311 u16 miux, remote_miu;
312 u8 rw;
313
314 pr_debug("%p optname %d\n", sk, optname);
315
316 if (level != SOL_NFC)
317 return -ENOPROTOOPT;
318
319 if (get_user(len, optlen))
320 return -EFAULT;
321
322 local = llcp_sock->local;
323 if (!local)
324 return -ENODEV;
325
326 len = min_t(u32, len, sizeof(u32));
327
328 lock_sock(sk);
329
330 switch (optname) {
331 case NFC_LLCP_RW:
332 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
333 if (put_user(rw, (u32 __user *) optval))
334 err = -EFAULT;
335
336 break;
337
338 case NFC_LLCP_MIUX:
339 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
340 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
341
342 if (put_user(miux, (u32 __user *) optval))
343 err = -EFAULT;
344
345 break;
346
347 case NFC_LLCP_REMOTE_MIU:
348 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
349 local->remote_miu : llcp_sock->remote_miu;
350
351 if (put_user(remote_miu, (u32 __user *) optval))
352 err = -EFAULT;
353
354 break;
355
356 case NFC_LLCP_REMOTE_LTO:
357 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
358 err = -EFAULT;
359
360 break;
361
362 case NFC_LLCP_REMOTE_RW:
363 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
364 err = -EFAULT;
365
366 break;
367
368 default:
369 err = -ENOPROTOOPT;
370 break;
371 }
372
373 release_sock(sk);
374
375 if (put_user(len, optlen))
376 return -EFAULT;
377
378 return err;
379 }
380
nfc_llcp_accept_unlink(struct sock * sk)381 void nfc_llcp_accept_unlink(struct sock *sk)
382 {
383 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
384
385 pr_debug("state %d\n", sk->sk_state);
386
387 list_del_init(&llcp_sock->accept_queue);
388 sk_acceptq_removed(llcp_sock->parent);
389 llcp_sock->parent = NULL;
390
391 sock_put(sk);
392 }
393
nfc_llcp_accept_enqueue(struct sock * parent,struct sock * sk)394 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
395 {
396 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
397 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
398
399 /* Lock will be free from unlink */
400 sock_hold(sk);
401
402 list_add_tail(&llcp_sock->accept_queue,
403 &llcp_sock_parent->accept_queue);
404 llcp_sock->parent = parent;
405 sk_acceptq_added(parent);
406 }
407
nfc_llcp_accept_dequeue(struct sock * parent,struct socket * newsock)408 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
409 struct socket *newsock)
410 {
411 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
412 struct sock *sk;
413
414 llcp_parent = nfc_llcp_sock(parent);
415
416 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
417 accept_queue) {
418 sk = &lsk->sk;
419 lock_sock(sk);
420
421 if (sk->sk_state == LLCP_CLOSED) {
422 release_sock(sk);
423 nfc_llcp_accept_unlink(sk);
424 continue;
425 }
426
427 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
428 list_del_init(&lsk->accept_queue);
429 sock_put(sk);
430
431 if (newsock)
432 sock_graft(sk, newsock);
433
434 release_sock(sk);
435
436 pr_debug("Returning sk state %d\n", sk->sk_state);
437
438 sk_acceptq_removed(parent);
439
440 return sk;
441 }
442
443 release_sock(sk);
444 }
445
446 return NULL;
447 }
448
llcp_sock_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)449 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
450 int flags, bool kern)
451 {
452 DECLARE_WAITQUEUE(wait, current);
453 struct sock *sk = sock->sk, *new_sk;
454 long timeo;
455 int ret = 0;
456
457 pr_debug("parent %p\n", sk);
458
459 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
460
461 if (sk->sk_state != LLCP_LISTEN) {
462 ret = -EBADFD;
463 goto error;
464 }
465
466 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
467
468 /* Wait for an incoming connection. */
469 add_wait_queue_exclusive(sk_sleep(sk), &wait);
470 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
471 set_current_state(TASK_INTERRUPTIBLE);
472
473 if (!timeo) {
474 ret = -EAGAIN;
475 break;
476 }
477
478 if (signal_pending(current)) {
479 ret = sock_intr_errno(timeo);
480 break;
481 }
482
483 release_sock(sk);
484 timeo = schedule_timeout(timeo);
485 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
486 }
487 __set_current_state(TASK_RUNNING);
488 remove_wait_queue(sk_sleep(sk), &wait);
489
490 if (ret)
491 goto error;
492
493 newsock->state = SS_CONNECTED;
494
495 pr_debug("new socket %p\n", new_sk);
496
497 error:
498 release_sock(sk);
499
500 return ret;
501 }
502
llcp_sock_getname(struct socket * sock,struct sockaddr * uaddr,int peer)503 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
504 int peer)
505 {
506 struct sock *sk = sock->sk;
507 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
508 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
509
510 if (llcp_sock == NULL || llcp_sock->dev == NULL)
511 return -EBADFD;
512
513 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
514 llcp_sock->dsap, llcp_sock->ssap);
515
516 memset(llcp_addr, 0, sizeof(*llcp_addr));
517
518 lock_sock(sk);
519 if (!llcp_sock->dev) {
520 release_sock(sk);
521 return -EBADFD;
522 }
523 llcp_addr->sa_family = AF_NFC;
524 llcp_addr->dev_idx = llcp_sock->dev->idx;
525 llcp_addr->target_idx = llcp_sock->target_idx;
526 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
527 llcp_addr->dsap = llcp_sock->dsap;
528 llcp_addr->ssap = llcp_sock->ssap;
529 llcp_addr->service_name_len = llcp_sock->service_name_len;
530 memcpy(llcp_addr->service_name, llcp_sock->service_name,
531 llcp_addr->service_name_len);
532 release_sock(sk);
533
534 return sizeof(struct sockaddr_nfc_llcp);
535 }
536
llcp_accept_poll(struct sock * parent)537 static inline __poll_t llcp_accept_poll(struct sock *parent)
538 {
539 struct nfc_llcp_sock *llcp_sock, *parent_sock;
540 struct sock *sk;
541
542 parent_sock = nfc_llcp_sock(parent);
543
544 list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
545 accept_queue) {
546 sk = &llcp_sock->sk;
547
548 if (sk->sk_state == LLCP_CONNECTED)
549 return EPOLLIN | EPOLLRDNORM;
550 }
551
552 return 0;
553 }
554
llcp_sock_poll(struct file * file,struct socket * sock,poll_table * wait)555 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
556 poll_table *wait)
557 {
558 struct sock *sk = sock->sk;
559 __poll_t mask = 0;
560
561 pr_debug("%p\n", sk);
562
563 sock_poll_wait(file, sock, wait);
564
565 if (sk->sk_state == LLCP_LISTEN)
566 return llcp_accept_poll(sk);
567
568 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
569 mask |= EPOLLERR |
570 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
571
572 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
573 mask |= EPOLLIN | EPOLLRDNORM;
574
575 if (sk->sk_state == LLCP_CLOSED)
576 mask |= EPOLLHUP;
577
578 if (sk->sk_shutdown & RCV_SHUTDOWN)
579 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
580
581 if (sk->sk_shutdown == SHUTDOWN_MASK)
582 mask |= EPOLLHUP;
583
584 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
585 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
586 else
587 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
588
589 pr_debug("mask 0x%x\n", mask);
590
591 return mask;
592 }
593
llcp_sock_release(struct socket * sock)594 static int llcp_sock_release(struct socket *sock)
595 {
596 struct sock *sk = sock->sk;
597 struct nfc_llcp_local *local;
598 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
599 int err = 0;
600
601 if (!sk)
602 return 0;
603
604 pr_debug("%p\n", sk);
605
606 local = llcp_sock->local;
607 if (local == NULL) {
608 err = -ENODEV;
609 goto out;
610 }
611
612 lock_sock(sk);
613
614 /* Send a DISC */
615 if (sk->sk_state == LLCP_CONNECTED)
616 nfc_llcp_send_disconnect(llcp_sock);
617
618 if (sk->sk_state == LLCP_LISTEN) {
619 struct nfc_llcp_sock *lsk, *n;
620 struct sock *accept_sk;
621
622 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
623 accept_queue) {
624 accept_sk = &lsk->sk;
625 lock_sock(accept_sk);
626
627 nfc_llcp_send_disconnect(lsk);
628 nfc_llcp_accept_unlink(accept_sk);
629
630 release_sock(accept_sk);
631 }
632 }
633
634 if (sock->type == SOCK_RAW)
635 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
636 else
637 nfc_llcp_sock_unlink(&local->sockets, sk);
638
639 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
640 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
641
642 release_sock(sk);
643
644 out:
645 sock_orphan(sk);
646 sock_put(sk);
647
648 return err;
649 }
650
llcp_sock_connect(struct socket * sock,struct sockaddr * _addr,int len,int flags)651 static 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 sock_llcp_put_local;
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 sock_llcp_put_local;
707 }
708
709 llcp_sock->dev = dev;
710 llcp_sock->local = local;
711 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
712 if (llcp_sock->ssap == LLCP_SAP_MAX) {
713 ret = -ENOMEM;
714 goto sock_llcp_nullify;
715 }
716
717 llcp_sock->reserved_ssap = llcp_sock->ssap;
718
719 if (addr->service_name_len == 0)
720 llcp_sock->dsap = addr->dsap;
721 else
722 llcp_sock->dsap = LLCP_SAP_SDP;
723 llcp_sock->nfc_protocol = addr->nfc_protocol;
724 llcp_sock->service_name_len = min_t(unsigned int,
725 addr->service_name_len,
726 NFC_LLCP_MAX_SERVICE_NAME);
727 llcp_sock->service_name = kmemdup(addr->service_name,
728 llcp_sock->service_name_len,
729 GFP_KERNEL);
730 if (!llcp_sock->service_name) {
731 ret = -ENOMEM;
732 goto sock_llcp_release;
733 }
734
735 nfc_llcp_sock_link(&local->connecting_sockets, sk);
736
737 ret = nfc_llcp_send_connect(llcp_sock);
738 if (ret)
739 goto sock_unlink;
740
741 sk->sk_state = LLCP_CONNECTING;
742
743 ret = sock_wait_state(sk, LLCP_CONNECTED,
744 sock_sndtimeo(sk, flags & O_NONBLOCK));
745 if (ret && ret != -EINPROGRESS)
746 goto sock_unlink;
747
748 release_sock(sk);
749
750 return ret;
751
752 sock_unlink:
753 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
754 kfree(llcp_sock->service_name);
755 llcp_sock->service_name = NULL;
756
757 sock_llcp_release:
758 nfc_llcp_put_ssap(local, llcp_sock->ssap);
759
760 sock_llcp_nullify:
761 llcp_sock->local = NULL;
762 llcp_sock->dev = NULL;
763
764 sock_llcp_put_local:
765 nfc_llcp_local_put(local);
766
767 put_dev:
768 nfc_put_device(dev);
769
770 error:
771 release_sock(sk);
772 return ret;
773 }
774
llcp_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)775 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
776 size_t len)
777 {
778 struct sock *sk = sock->sk;
779 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
780 int ret;
781
782 pr_debug("sock %p sk %p", sock, sk);
783
784 ret = sock_error(sk);
785 if (ret)
786 return ret;
787
788 if (msg->msg_flags & MSG_OOB)
789 return -EOPNOTSUPP;
790
791 lock_sock(sk);
792
793 if (!llcp_sock->local) {
794 release_sock(sk);
795 return -ENODEV;
796 }
797
798 if (sk->sk_type == SOCK_DGRAM) {
799 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
800 msg->msg_name);
801
802 if (msg->msg_namelen < sizeof(*addr)) {
803 release_sock(sk);
804 return -EINVAL;
805 }
806
807 release_sock(sk);
808
809 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
810 msg, len);
811 }
812
813 if (sk->sk_state != LLCP_CONNECTED) {
814 release_sock(sk);
815 return -ENOTCONN;
816 }
817
818 release_sock(sk);
819
820 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
821 }
822
llcp_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)823 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
824 size_t len, int flags)
825 {
826 struct sock *sk = sock->sk;
827 unsigned int copied, rlen;
828 struct sk_buff *skb, *cskb;
829 int err = 0;
830
831 pr_debug("%p %zu\n", sk, len);
832
833 lock_sock(sk);
834
835 if (sk->sk_state == LLCP_CLOSED &&
836 skb_queue_empty(&sk->sk_receive_queue)) {
837 release_sock(sk);
838 return 0;
839 }
840
841 release_sock(sk);
842
843 if (flags & (MSG_OOB))
844 return -EOPNOTSUPP;
845
846 skb = skb_recv_datagram(sk, flags, &err);
847 if (!skb) {
848 pr_err("Recv datagram failed state %d %d %d",
849 sk->sk_state, err, sock_error(sk));
850
851 if (sk->sk_shutdown & RCV_SHUTDOWN)
852 return 0;
853
854 return err;
855 }
856
857 rlen = skb->len; /* real length of skb */
858 copied = min_t(unsigned int, rlen, len);
859
860 cskb = skb;
861 if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
862 if (!(flags & MSG_PEEK))
863 skb_queue_head(&sk->sk_receive_queue, skb);
864 return -EFAULT;
865 }
866
867 sock_recv_timestamp(msg, sk, skb);
868
869 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
870 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
871 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
872 msg->msg_name);
873
874 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
875
876 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
877
878 memset(sockaddr, 0, sizeof(*sockaddr));
879 sockaddr->sa_family = AF_NFC;
880 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
881 sockaddr->dsap = ui_cb->dsap;
882 sockaddr->ssap = ui_cb->ssap;
883 }
884
885 /* Mark read part of skb as used */
886 if (!(flags & MSG_PEEK)) {
887
888 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
889 if (sk->sk_type == SOCK_STREAM ||
890 sk->sk_type == SOCK_DGRAM ||
891 sk->sk_type == SOCK_RAW) {
892 skb_pull(skb, copied);
893 if (skb->len) {
894 skb_queue_head(&sk->sk_receive_queue, skb);
895 goto done;
896 }
897 }
898
899 kfree_skb(skb);
900 }
901
902 /* XXX Queue backlogged skbs */
903
904 done:
905 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
906 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
907 copied = rlen;
908
909 return copied;
910 }
911
912 static const struct proto_ops llcp_sock_ops = {
913 .family = PF_NFC,
914 .owner = THIS_MODULE,
915 .bind = llcp_sock_bind,
916 .connect = llcp_sock_connect,
917 .release = llcp_sock_release,
918 .socketpair = sock_no_socketpair,
919 .accept = llcp_sock_accept,
920 .getname = llcp_sock_getname,
921 .poll = llcp_sock_poll,
922 .ioctl = sock_no_ioctl,
923 .listen = llcp_sock_listen,
924 .shutdown = sock_no_shutdown,
925 .setsockopt = nfc_llcp_setsockopt,
926 .getsockopt = nfc_llcp_getsockopt,
927 .sendmsg = llcp_sock_sendmsg,
928 .recvmsg = llcp_sock_recvmsg,
929 .mmap = sock_no_mmap,
930 };
931
932 static const struct proto_ops llcp_rawsock_ops = {
933 .family = PF_NFC,
934 .owner = THIS_MODULE,
935 .bind = llcp_raw_sock_bind,
936 .connect = sock_no_connect,
937 .release = llcp_sock_release,
938 .socketpair = sock_no_socketpair,
939 .accept = sock_no_accept,
940 .getname = llcp_sock_getname,
941 .poll = llcp_sock_poll,
942 .ioctl = sock_no_ioctl,
943 .listen = sock_no_listen,
944 .shutdown = sock_no_shutdown,
945 .sendmsg = sock_no_sendmsg,
946 .recvmsg = llcp_sock_recvmsg,
947 .mmap = sock_no_mmap,
948 };
949
llcp_sock_destruct(struct sock * sk)950 static void llcp_sock_destruct(struct sock *sk)
951 {
952 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
953
954 pr_debug("%p\n", sk);
955
956 if (sk->sk_state == LLCP_CONNECTED)
957 nfc_put_device(llcp_sock->dev);
958
959 skb_queue_purge(&sk->sk_receive_queue);
960
961 nfc_llcp_sock_free(llcp_sock);
962
963 if (!sock_flag(sk, SOCK_DEAD)) {
964 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
965 return;
966 }
967 }
968
nfc_llcp_sock_alloc(struct socket * sock,int type,gfp_t gfp,int kern)969 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
970 {
971 struct sock *sk;
972 struct nfc_llcp_sock *llcp_sock;
973
974 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
975 if (!sk)
976 return NULL;
977
978 llcp_sock = nfc_llcp_sock(sk);
979
980 sock_init_data(sock, sk);
981 sk->sk_state = LLCP_CLOSED;
982 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
983 sk->sk_type = type;
984 sk->sk_destruct = llcp_sock_destruct;
985
986 llcp_sock->ssap = 0;
987 llcp_sock->dsap = LLCP_SAP_SDP;
988 llcp_sock->rw = LLCP_MAX_RW + 1;
989 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
990 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
991 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
992 llcp_sock->remote_ready = 1;
993 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
994 nfc_llcp_socket_remote_param_init(llcp_sock);
995 skb_queue_head_init(&llcp_sock->tx_queue);
996 skb_queue_head_init(&llcp_sock->tx_pending_queue);
997 INIT_LIST_HEAD(&llcp_sock->accept_queue);
998
999 if (sock != NULL)
1000 sock->state = SS_UNCONNECTED;
1001
1002 return sk;
1003 }
1004
nfc_llcp_sock_free(struct nfc_llcp_sock * sock)1005 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
1006 {
1007 kfree(sock->service_name);
1008
1009 skb_queue_purge(&sock->tx_queue);
1010 skb_queue_purge(&sock->tx_pending_queue);
1011
1012 list_del_init(&sock->accept_queue);
1013
1014 sock->parent = NULL;
1015
1016 nfc_llcp_local_put(sock->local);
1017 }
1018
llcp_sock_create(struct net * net,struct socket * sock,const struct nfc_protocol * nfc_proto,int kern)1019 static int llcp_sock_create(struct net *net, struct socket *sock,
1020 const struct nfc_protocol *nfc_proto, int kern)
1021 {
1022 struct sock *sk;
1023
1024 pr_debug("%p\n", sock);
1025
1026 if (sock->type != SOCK_STREAM &&
1027 sock->type != SOCK_DGRAM &&
1028 sock->type != SOCK_RAW)
1029 return -ESOCKTNOSUPPORT;
1030
1031 if (sock->type == SOCK_RAW) {
1032 if (!capable(CAP_NET_RAW))
1033 return -EPERM;
1034 sock->ops = &llcp_rawsock_ops;
1035 } else {
1036 sock->ops = &llcp_sock_ops;
1037 }
1038
1039 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1040 if (sk == NULL)
1041 return -ENOMEM;
1042
1043 return 0;
1044 }
1045
1046 static const struct nfc_protocol llcp_nfc_proto = {
1047 .id = NFC_SOCKPROTO_LLCP,
1048 .proto = &llcp_sock_proto,
1049 .owner = THIS_MODULE,
1050 .create = llcp_sock_create
1051 };
1052
nfc_llcp_sock_init(void)1053 int __init nfc_llcp_sock_init(void)
1054 {
1055 return nfc_proto_register(&llcp_nfc_proto);
1056 }
1057
nfc_llcp_sock_exit(void)1058 void nfc_llcp_sock_exit(void)
1059 {
1060 nfc_proto_unregister(&llcp_nfc_proto);
1061 }
1062
