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_unsized * addr,int alen)59 static int llcp_sock_bind(struct socket *sock, struct sockaddr_unsized *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_unsized * addr,int alen)149 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr_unsized *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 err = copy_safe_from_sockptr(&opt, sizeof(opt),
256 optval, optlen);
257 if (err)
258 break;
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 err = copy_safe_from_sockptr(&opt, sizeof(opt),
278 optval, optlen);
279 if (err)
280 break;
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 if (len < 0)
323 return -EINVAL;
324
325 if (len < sizeof(u32))
326 return -EINVAL;
327
328 len = min_t(u32, len, sizeof(u32));
329
330 lock_sock(sk);
331
332 local = llcp_sock->local;
333 if (!local) {
334 release_sock(sk);
335 return -ENODEV;
336 }
337
338 switch (optname) {
339 case NFC_LLCP_RW:
340 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
341 if (put_user(rw, (u32 __user *) optval))
342 err = -EFAULT;
343
344 break;
345
346 case NFC_LLCP_MIUX:
347 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
348 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
349
350 if (put_user(miux, (u32 __user *) optval))
351 err = -EFAULT;
352
353 break;
354
355 case NFC_LLCP_REMOTE_MIU:
356 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
357 local->remote_miu : llcp_sock->remote_miu;
358
359 if (put_user(remote_miu, (u32 __user *) optval))
360 err = -EFAULT;
361
362 break;
363
364 case NFC_LLCP_REMOTE_LTO:
365 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
366 err = -EFAULT;
367
368 break;
369
370 case NFC_LLCP_REMOTE_RW:
371 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
372 err = -EFAULT;
373
374 break;
375
376 default:
377 err = -ENOPROTOOPT;
378 break;
379 }
380
381 release_sock(sk);
382
383 if (put_user(len, optlen))
384 return -EFAULT;
385
386 return err;
387 }
388
nfc_llcp_accept_unlink(struct sock * sk)389 void nfc_llcp_accept_unlink(struct sock *sk)
390 {
391 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
392
393 pr_debug("state %d\n", sk->sk_state);
394
395 list_del_init(&llcp_sock->accept_queue);
396 sk_acceptq_removed(llcp_sock->parent);
397 llcp_sock->parent = NULL;
398
399 sock_put(sk);
400 }
401
nfc_llcp_accept_enqueue(struct sock * parent,struct sock * sk)402 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
403 {
404 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
405 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
406
407 /* Lock will be free from unlink */
408 sock_hold(sk);
409
410 list_add_tail(&llcp_sock->accept_queue,
411 &llcp_sock_parent->accept_queue);
412 llcp_sock->parent = parent;
413 sk_acceptq_added(parent);
414 }
415
nfc_llcp_accept_dequeue(struct sock * parent,struct socket * newsock)416 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
417 struct socket *newsock)
418 {
419 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
420 struct sock *sk;
421
422 llcp_parent = nfc_llcp_sock(parent);
423
424 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
425 accept_queue) {
426 sk = &lsk->sk;
427 lock_sock(sk);
428
429 if (sk->sk_state == LLCP_CLOSED) {
430 release_sock(sk);
431 nfc_llcp_accept_unlink(sk);
432 continue;
433 }
434
435 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
436 list_del_init(&lsk->accept_queue);
437 sock_put(sk);
438
439 if (newsock)
440 sock_graft(sk, newsock);
441
442 release_sock(sk);
443
444 pr_debug("Returning sk state %d\n", sk->sk_state);
445
446 sk_acceptq_removed(parent);
447
448 return sk;
449 }
450
451 release_sock(sk);
452 }
453
454 return NULL;
455 }
456
llcp_sock_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)457 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
458 struct proto_accept_arg *arg)
459 {
460 DECLARE_WAITQUEUE(wait, current);
461 struct sock *sk = sock->sk, *new_sk;
462 long timeo;
463 int ret = 0;
464
465 pr_debug("parent %p\n", sk);
466
467 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
468
469 if (sk->sk_state != LLCP_LISTEN) {
470 ret = -EBADFD;
471 goto error;
472 }
473
474 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
475
476 /* Wait for an incoming connection. */
477 add_wait_queue_exclusive(sk_sleep(sk), &wait);
478 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
479 set_current_state(TASK_INTERRUPTIBLE);
480
481 if (!timeo) {
482 ret = -EAGAIN;
483 break;
484 }
485
486 if (signal_pending(current)) {
487 ret = sock_intr_errno(timeo);
488 break;
489 }
490
491 release_sock(sk);
492 timeo = schedule_timeout(timeo);
493 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
494 }
495 __set_current_state(TASK_RUNNING);
496 remove_wait_queue(sk_sleep(sk), &wait);
497
498 if (ret)
499 goto error;
500
501 newsock->state = SS_CONNECTED;
502
503 pr_debug("new socket %p\n", new_sk);
504
505 error:
506 release_sock(sk);
507
508 return ret;
509 }
510
llcp_sock_getname(struct socket * sock,struct sockaddr * uaddr,int peer)511 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
512 int peer)
513 {
514 struct sock *sk = sock->sk;
515 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
516 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
517
518 if (llcp_sock == NULL || llcp_sock->dev == NULL)
519 return -EBADFD;
520
521 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
522 llcp_sock->dsap, llcp_sock->ssap);
523
524 memset(llcp_addr, 0, sizeof(*llcp_addr));
525
526 lock_sock(sk);
527 if (!llcp_sock->dev) {
528 release_sock(sk);
529 return -EBADFD;
530 }
531 llcp_addr->sa_family = AF_NFC;
532 llcp_addr->dev_idx = llcp_sock->dev->idx;
533 llcp_addr->target_idx = llcp_sock->target_idx;
534 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
535 llcp_addr->dsap = llcp_sock->dsap;
536 llcp_addr->ssap = llcp_sock->ssap;
537 llcp_addr->service_name_len = llcp_sock->service_name_len;
538 memcpy(llcp_addr->service_name, llcp_sock->service_name,
539 llcp_addr->service_name_len);
540 release_sock(sk);
541
542 return sizeof(struct sockaddr_nfc_llcp);
543 }
544
llcp_accept_poll(struct sock * parent)545 static inline __poll_t llcp_accept_poll(struct sock *parent)
546 {
547 struct nfc_llcp_sock *llcp_sock, *parent_sock;
548 struct sock *sk;
549
550 parent_sock = nfc_llcp_sock(parent);
551
552 list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
553 accept_queue) {
554 sk = &llcp_sock->sk;
555
556 if (sk->sk_state == LLCP_CONNECTED)
557 return EPOLLIN | EPOLLRDNORM;
558 }
559
560 return 0;
561 }
562
llcp_sock_poll(struct file * file,struct socket * sock,poll_table * wait)563 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
564 poll_table *wait)
565 {
566 struct sock *sk = sock->sk;
567 __poll_t mask = 0;
568
569 pr_debug("%p\n", sk);
570
571 sock_poll_wait(file, sock, wait);
572
573 if (sk->sk_state == LLCP_LISTEN)
574 return llcp_accept_poll(sk);
575
576 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
577 mask |= EPOLLERR |
578 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
579
580 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
581 mask |= EPOLLIN | EPOLLRDNORM;
582
583 if (sk->sk_state == LLCP_CLOSED)
584 mask |= EPOLLHUP;
585
586 if (sk->sk_shutdown & RCV_SHUTDOWN)
587 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
588
589 if (sk->sk_shutdown == SHUTDOWN_MASK)
590 mask |= EPOLLHUP;
591
592 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
593 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
594 else
595 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
596
597 pr_debug("mask 0x%x\n", mask);
598
599 return mask;
600 }
601
llcp_sock_release(struct socket * sock)602 static int llcp_sock_release(struct socket *sock)
603 {
604 struct sock *sk = sock->sk;
605 struct nfc_llcp_local *local;
606 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
607 int err = 0;
608
609 if (!sk)
610 return 0;
611
612 pr_debug("%p\n", sk);
613
614 local = llcp_sock->local;
615 if (local == NULL) {
616 err = -ENODEV;
617 goto out;
618 }
619
620 lock_sock(sk);
621
622 /* Send a DISC */
623 if (sk->sk_state == LLCP_CONNECTED)
624 nfc_llcp_send_disconnect(llcp_sock);
625
626 if (sk->sk_state == LLCP_LISTEN) {
627 struct nfc_llcp_sock *lsk, *n;
628 struct sock *accept_sk;
629
630 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
631 accept_queue) {
632 accept_sk = &lsk->sk;
633 lock_sock(accept_sk);
634
635 nfc_llcp_send_disconnect(lsk);
636 nfc_llcp_accept_unlink(accept_sk);
637
638 release_sock(accept_sk);
639 }
640 }
641
642 if (sock->type == SOCK_RAW)
643 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
644 else if (sk->sk_state == LLCP_CONNECTING)
645 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
646 else
647 nfc_llcp_sock_unlink(&local->sockets, sk);
648
649 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
650 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
651
652 release_sock(sk);
653
654 out:
655 sock_orphan(sk);
656 sock_put(sk);
657
658 return err;
659 }
660
llcp_sock_connect(struct socket * sock,struct sockaddr_unsized * _addr,int len,int flags)661 static int llcp_sock_connect(struct socket *sock, struct sockaddr_unsized *_addr,
662 int len, int flags)
663 {
664 struct sock *sk = sock->sk;
665 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
666 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
667 struct nfc_dev *dev;
668 struct nfc_llcp_local *local;
669 int ret = 0;
670
671 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
672
673 if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
674 return -EINVAL;
675
676 if (addr->service_name_len == 0 && addr->dsap == 0)
677 return -EINVAL;
678
679 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
680 addr->target_idx, addr->nfc_protocol);
681
682 lock_sock(sk);
683
684 if (sk->sk_state == LLCP_CONNECTED) {
685 ret = -EISCONN;
686 goto error;
687 }
688 if (sk->sk_state == LLCP_CONNECTING) {
689 ret = -EINPROGRESS;
690 goto error;
691 }
692
693 dev = nfc_get_device(addr->dev_idx);
694 if (dev == NULL) {
695 ret = -ENODEV;
696 goto error;
697 }
698
699 local = nfc_llcp_find_local(dev);
700 if (local == NULL) {
701 ret = -ENODEV;
702 goto put_dev;
703 }
704
705 device_lock(&dev->dev);
706 if (dev->dep_link_up == false) {
707 ret = -ENOLINK;
708 device_unlock(&dev->dev);
709 goto sock_llcp_put_local;
710 }
711 device_unlock(&dev->dev);
712
713 if (local->rf_mode == NFC_RF_INITIATOR &&
714 addr->target_idx != local->target_idx) {
715 ret = -ENOLINK;
716 goto sock_llcp_put_local;
717 }
718
719 llcp_sock->dev = dev;
720 llcp_sock->local = local;
721 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
722 if (llcp_sock->ssap == LLCP_SAP_MAX) {
723 ret = -ENOMEM;
724 goto sock_llcp_nullify;
725 }
726
727 llcp_sock->reserved_ssap = llcp_sock->ssap;
728
729 if (addr->service_name_len == 0)
730 llcp_sock->dsap = addr->dsap;
731 else
732 llcp_sock->dsap = LLCP_SAP_SDP;
733 llcp_sock->nfc_protocol = addr->nfc_protocol;
734 llcp_sock->service_name_len = min_t(unsigned int,
735 addr->service_name_len,
736 NFC_LLCP_MAX_SERVICE_NAME);
737 llcp_sock->service_name = kmemdup(addr->service_name,
738 llcp_sock->service_name_len,
739 GFP_KERNEL);
740 if (!llcp_sock->service_name) {
741 ret = -ENOMEM;
742 goto sock_llcp_release;
743 }
744
745 nfc_llcp_sock_link(&local->connecting_sockets, sk);
746
747 ret = nfc_llcp_send_connect(llcp_sock);
748 if (ret)
749 goto sock_unlink;
750
751 sk->sk_state = LLCP_CONNECTING;
752
753 ret = sock_wait_state(sk, LLCP_CONNECTED,
754 sock_sndtimeo(sk, flags & O_NONBLOCK));
755 if (ret && ret != -EINPROGRESS)
756 goto sock_unlink;
757
758 release_sock(sk);
759
760 return ret;
761
762 sock_unlink:
763 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
764 kfree(llcp_sock->service_name);
765 llcp_sock->service_name = NULL;
766
767 sock_llcp_release:
768 nfc_llcp_put_ssap(local, llcp_sock->ssap);
769
770 sock_llcp_nullify:
771 llcp_sock->local = NULL;
772 llcp_sock->dev = NULL;
773
774 sock_llcp_put_local:
775 nfc_llcp_local_put(local);
776
777 put_dev:
778 nfc_put_device(dev);
779
780 error:
781 release_sock(sk);
782 return ret;
783 }
784
llcp_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)785 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
786 size_t len)
787 {
788 struct sock *sk = sock->sk;
789 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
790 int ret;
791
792 pr_debug("sock %p sk %p", sock, sk);
793
794 ret = sock_error(sk);
795 if (ret)
796 return ret;
797
798 if (msg->msg_flags & MSG_OOB)
799 return -EOPNOTSUPP;
800
801 lock_sock(sk);
802
803 if (!llcp_sock->local) {
804 release_sock(sk);
805 return -ENODEV;
806 }
807
808 if (sk->sk_type == SOCK_DGRAM) {
809 if (sk->sk_state != LLCP_BOUND) {
810 release_sock(sk);
811 return -ENOTCONN;
812 }
813
814 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
815 msg->msg_name);
816
817 if (msg->msg_namelen < sizeof(*addr)) {
818 release_sock(sk);
819 return -EINVAL;
820 }
821
822 release_sock(sk);
823
824 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
825 msg, len);
826 }
827
828 if (sk->sk_state != LLCP_CONNECTED) {
829 release_sock(sk);
830 return -ENOTCONN;
831 }
832
833 release_sock(sk);
834
835 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
836 }
837
llcp_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)838 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
839 size_t len, int flags)
840 {
841 struct sock *sk = sock->sk;
842 unsigned int copied, rlen;
843 struct sk_buff *skb, *cskb;
844 int err = 0;
845
846 pr_debug("%p %zu\n", sk, len);
847
848 lock_sock(sk);
849
850 if (sk->sk_state == LLCP_CLOSED &&
851 skb_queue_empty(&sk->sk_receive_queue)) {
852 release_sock(sk);
853 return 0;
854 }
855
856 release_sock(sk);
857
858 if (flags & (MSG_OOB))
859 return -EOPNOTSUPP;
860
861 skb = skb_recv_datagram(sk, flags, &err);
862 if (!skb) {
863 pr_err("Recv datagram failed state %d %d %d",
864 sk->sk_state, err, sock_error(sk));
865
866 if (sk->sk_shutdown & RCV_SHUTDOWN)
867 return 0;
868
869 return err;
870 }
871
872 rlen = skb->len; /* real length of skb */
873 copied = min_t(unsigned int, rlen, len);
874
875 cskb = skb;
876 if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
877 if (!(flags & MSG_PEEK))
878 skb_queue_head(&sk->sk_receive_queue, skb);
879 return -EFAULT;
880 }
881
882 sock_recv_timestamp(msg, sk, skb);
883
884 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
885 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
886 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
887 msg->msg_name);
888
889 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
890
891 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
892
893 memset(sockaddr, 0, sizeof(*sockaddr));
894 sockaddr->sa_family = AF_NFC;
895 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
896 sockaddr->dsap = ui_cb->dsap;
897 sockaddr->ssap = ui_cb->ssap;
898 }
899
900 /* Mark read part of skb as used */
901 if (!(flags & MSG_PEEK)) {
902
903 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
904 if (sk->sk_type == SOCK_STREAM ||
905 sk->sk_type == SOCK_DGRAM ||
906 sk->sk_type == SOCK_RAW) {
907 skb_pull(skb, copied);
908 if (skb->len) {
909 skb_queue_head(&sk->sk_receive_queue, skb);
910 goto done;
911 }
912 }
913
914 kfree_skb(skb);
915 }
916
917 /* XXX Queue backlogged skbs */
918
919 done:
920 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
921 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
922 copied = rlen;
923
924 return copied;
925 }
926
927 static const struct proto_ops llcp_sock_ops = {
928 .family = PF_NFC,
929 .owner = THIS_MODULE,
930 .bind = llcp_sock_bind,
931 .connect = llcp_sock_connect,
932 .release = llcp_sock_release,
933 .socketpair = sock_no_socketpair,
934 .accept = llcp_sock_accept,
935 .getname = llcp_sock_getname,
936 .poll = llcp_sock_poll,
937 .ioctl = sock_no_ioctl,
938 .listen = llcp_sock_listen,
939 .shutdown = sock_no_shutdown,
940 .setsockopt = nfc_llcp_setsockopt,
941 .getsockopt = nfc_llcp_getsockopt,
942 .sendmsg = llcp_sock_sendmsg,
943 .recvmsg = llcp_sock_recvmsg,
944 .mmap = sock_no_mmap,
945 };
946
947 static const struct proto_ops llcp_rawsock_ops = {
948 .family = PF_NFC,
949 .owner = THIS_MODULE,
950 .bind = llcp_raw_sock_bind,
951 .connect = sock_no_connect,
952 .release = llcp_sock_release,
953 .socketpair = sock_no_socketpair,
954 .accept = sock_no_accept,
955 .getname = llcp_sock_getname,
956 .poll = llcp_sock_poll,
957 .ioctl = sock_no_ioctl,
958 .listen = sock_no_listen,
959 .shutdown = sock_no_shutdown,
960 .sendmsg = sock_no_sendmsg,
961 .recvmsg = llcp_sock_recvmsg,
962 .mmap = sock_no_mmap,
963 };
964
llcp_sock_destruct(struct sock * sk)965 static void llcp_sock_destruct(struct sock *sk)
966 {
967 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
968
969 pr_debug("%p\n", sk);
970
971 if (sk->sk_state == LLCP_CONNECTED)
972 nfc_put_device(llcp_sock->dev);
973
974 skb_queue_purge(&sk->sk_receive_queue);
975
976 nfc_llcp_sock_free(llcp_sock);
977
978 if (!sock_flag(sk, SOCK_DEAD)) {
979 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
980 return;
981 }
982 }
983
nfc_llcp_sock_alloc(struct socket * sock,int type,gfp_t gfp,int kern)984 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
985 {
986 struct sock *sk;
987 struct nfc_llcp_sock *llcp_sock;
988
989 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
990 if (!sk)
991 return NULL;
992
993 llcp_sock = nfc_llcp_sock(sk);
994
995 sock_init_data(sock, sk);
996 sk->sk_state = LLCP_CLOSED;
997 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
998 sk->sk_type = type;
999 sk->sk_destruct = llcp_sock_destruct;
1000
1001 llcp_sock->ssap = 0;
1002 llcp_sock->dsap = LLCP_SAP_SDP;
1003 llcp_sock->rw = LLCP_MAX_RW + 1;
1004 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
1005 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
1006 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
1007 llcp_sock->remote_ready = 1;
1008 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
1009 nfc_llcp_socket_remote_param_init(llcp_sock);
1010 skb_queue_head_init(&llcp_sock->tx_queue);
1011 skb_queue_head_init(&llcp_sock->tx_pending_queue);
1012 INIT_LIST_HEAD(&llcp_sock->accept_queue);
1013
1014 if (sock != NULL)
1015 sock->state = SS_UNCONNECTED;
1016
1017 return sk;
1018 }
1019
nfc_llcp_sock_free(struct nfc_llcp_sock * sock)1020 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
1021 {
1022 kfree(sock->service_name);
1023
1024 skb_queue_purge(&sock->tx_queue);
1025 skb_queue_purge(&sock->tx_pending_queue);
1026
1027 list_del_init(&sock->accept_queue);
1028
1029 sock->parent = NULL;
1030
1031 nfc_llcp_local_put(sock->local);
1032 }
1033
llcp_sock_create(struct net * net,struct socket * sock,const struct nfc_protocol * nfc_proto,int kern)1034 static int llcp_sock_create(struct net *net, struct socket *sock,
1035 const struct nfc_protocol *nfc_proto, int kern)
1036 {
1037 struct sock *sk;
1038
1039 pr_debug("%p\n", sock);
1040
1041 if (sock->type != SOCK_STREAM &&
1042 sock->type != SOCK_DGRAM &&
1043 sock->type != SOCK_RAW)
1044 return -ESOCKTNOSUPPORT;
1045
1046 if (sock->type == SOCK_RAW) {
1047 if (!capable(CAP_NET_RAW))
1048 return -EPERM;
1049 sock->ops = &llcp_rawsock_ops;
1050 } else {
1051 sock->ops = &llcp_sock_ops;
1052 }
1053
1054 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1055 if (sk == NULL)
1056 return -ENOMEM;
1057
1058 return 0;
1059 }
1060
1061 static const struct nfc_protocol llcp_nfc_proto = {
1062 .id = NFC_SOCKPROTO_LLCP,
1063 .proto = &llcp_sock_proto,
1064 .owner = THIS_MODULE,
1065 .create = llcp_sock_create
1066 };
1067
nfc_llcp_sock_init(void)1068 int __init nfc_llcp_sock_init(void)
1069 {
1070 return nfc_proto_register(&llcp_nfc_proto);
1071 }
1072
nfc_llcp_sock_exit(void)1073 void nfc_llcp_sock_exit(void)
1074 {
1075 nfc_proto_unregister(&llcp_nfc_proto);
1076 }
1077