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 = 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 llcp_sock->dev = NULL;
114 ret = -ENOMEM;
115 goto put_dev;
116 }
117 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
118 if (llcp_sock->ssap == LLCP_SAP_MAX) {
119 nfc_llcp_local_put(llcp_sock->local);
120 llcp_sock->local = NULL;
121 kfree(llcp_sock->service_name);
122 llcp_sock->service_name = NULL;
123 llcp_sock->dev = NULL;
124 ret = -EADDRINUSE;
125 goto put_dev;
126 }
127
128 llcp_sock->reserved_ssap = llcp_sock->ssap;
129
130 nfc_llcp_sock_link(&local->sockets, sk);
131
132 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
133
134 sk->sk_state = LLCP_BOUND;
135
136 put_dev:
137 nfc_put_device(dev);
138
139 error:
140 release_sock(sk);
141 return ret;
142 }
143
llcp_raw_sock_bind(struct socket * sock,struct sockaddr * addr,int alen)144 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
145 int alen)
146 {
147 struct sock *sk = sock->sk;
148 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
149 struct nfc_llcp_local *local;
150 struct nfc_dev *dev;
151 struct sockaddr_nfc_llcp llcp_addr;
152 int len, ret = 0;
153
154 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
155 addr->sa_family != AF_NFC)
156 return -EINVAL;
157
158 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
159
160 memset(&llcp_addr, 0, sizeof(llcp_addr));
161 len = min_t(unsigned int, sizeof(llcp_addr), alen);
162 memcpy(&llcp_addr, addr, len);
163
164 lock_sock(sk);
165
166 if (sk->sk_state != LLCP_CLOSED) {
167 ret = -EBADFD;
168 goto error;
169 }
170
171 dev = nfc_get_device(llcp_addr.dev_idx);
172 if (dev == NULL) {
173 ret = -ENODEV;
174 goto error;
175 }
176
177 local = nfc_llcp_find_local(dev);
178 if (local == NULL) {
179 ret = -ENODEV;
180 goto put_dev;
181 }
182
183 llcp_sock->dev = dev;
184 llcp_sock->local = nfc_llcp_local_get(local);
185 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
186
187 nfc_llcp_sock_link(&local->raw_sockets, sk);
188
189 sk->sk_state = LLCP_BOUND;
190
191 put_dev:
192 nfc_put_device(dev);
193
194 error:
195 release_sock(sk);
196 return ret;
197 }
198
llcp_sock_listen(struct socket * sock,int backlog)199 static int llcp_sock_listen(struct socket *sock, int backlog)
200 {
201 struct sock *sk = sock->sk;
202 int ret = 0;
203
204 pr_debug("sk %p backlog %d\n", sk, backlog);
205
206 lock_sock(sk);
207
208 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
209 sk->sk_state != LLCP_BOUND) {
210 ret = -EBADFD;
211 goto error;
212 }
213
214 sk->sk_max_ack_backlog = backlog;
215 sk->sk_ack_backlog = 0;
216
217 pr_debug("Socket listening\n");
218 sk->sk_state = LLCP_LISTEN;
219
220 error:
221 release_sock(sk);
222
223 return ret;
224 }
225
nfc_llcp_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)226 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
227 sockptr_t optval, unsigned int optlen)
228 {
229 struct sock *sk = sock->sk;
230 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
231 u32 opt;
232 int err = 0;
233
234 pr_debug("%p optname %d\n", sk, optname);
235
236 if (level != SOL_NFC)
237 return -ENOPROTOOPT;
238
239 lock_sock(sk);
240
241 switch (optname) {
242 case NFC_LLCP_RW:
243 if (sk->sk_state == LLCP_CONNECTED ||
244 sk->sk_state == LLCP_BOUND ||
245 sk->sk_state == LLCP_LISTEN) {
246 err = -EINVAL;
247 break;
248 }
249
250 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
251 err = -EFAULT;
252 break;
253 }
254
255 if (opt > LLCP_MAX_RW) {
256 err = -EINVAL;
257 break;
258 }
259
260 llcp_sock->rw = (u8) opt;
261
262 break;
263
264 case NFC_LLCP_MIUX:
265 if (sk->sk_state == LLCP_CONNECTED ||
266 sk->sk_state == LLCP_BOUND ||
267 sk->sk_state == LLCP_LISTEN) {
268 err = -EINVAL;
269 break;
270 }
271
272 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
273 err = -EFAULT;
274 break;
275 }
276
277 if (opt > LLCP_MAX_MIUX) {
278 err = -EINVAL;
279 break;
280 }
281
282 llcp_sock->miux = cpu_to_be16((u16) opt);
283
284 break;
285
286 default:
287 err = -ENOPROTOOPT;
288 break;
289 }
290
291 release_sock(sk);
292
293 pr_debug("%p rw %d miux %d\n", llcp_sock,
294 llcp_sock->rw, llcp_sock->miux);
295
296 return err;
297 }
298
nfc_llcp_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)299 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, int __user *optlen)
301 {
302 struct nfc_llcp_local *local;
303 struct sock *sk = sock->sk;
304 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
305 int len, err = 0;
306 u16 miux, remote_miu;
307 u8 rw;
308
309 pr_debug("%p optname %d\n", sk, optname);
310
311 if (level != SOL_NFC)
312 return -ENOPROTOOPT;
313
314 if (get_user(len, optlen))
315 return -EFAULT;
316
317 local = llcp_sock->local;
318 if (!local)
319 return -ENODEV;
320
321 len = min_t(u32, len, sizeof(u32));
322
323 lock_sock(sk);
324
325 switch (optname) {
326 case NFC_LLCP_RW:
327 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
328 if (put_user(rw, (u32 __user *) optval))
329 err = -EFAULT;
330
331 break;
332
333 case NFC_LLCP_MIUX:
334 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
335 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
336
337 if (put_user(miux, (u32 __user *) optval))
338 err = -EFAULT;
339
340 break;
341
342 case NFC_LLCP_REMOTE_MIU:
343 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
344 local->remote_miu : llcp_sock->remote_miu;
345
346 if (put_user(remote_miu, (u32 __user *) optval))
347 err = -EFAULT;
348
349 break;
350
351 case NFC_LLCP_REMOTE_LTO:
352 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
353 err = -EFAULT;
354
355 break;
356
357 case NFC_LLCP_REMOTE_RW:
358 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
359 err = -EFAULT;
360
361 break;
362
363 default:
364 err = -ENOPROTOOPT;
365 break;
366 }
367
368 release_sock(sk);
369
370 if (put_user(len, optlen))
371 return -EFAULT;
372
373 return err;
374 }
375
nfc_llcp_accept_unlink(struct sock * sk)376 void nfc_llcp_accept_unlink(struct sock *sk)
377 {
378 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
379
380 pr_debug("state %d\n", sk->sk_state);
381
382 list_del_init(&llcp_sock->accept_queue);
383 sk_acceptq_removed(llcp_sock->parent);
384 llcp_sock->parent = NULL;
385
386 sock_put(sk);
387 }
388
nfc_llcp_accept_enqueue(struct sock * parent,struct sock * sk)389 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
390 {
391 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
392 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
393
394 /* Lock will be free from unlink */
395 sock_hold(sk);
396
397 list_add_tail(&llcp_sock->accept_queue,
398 &llcp_sock_parent->accept_queue);
399 llcp_sock->parent = parent;
400 sk_acceptq_added(parent);
401 }
402
nfc_llcp_accept_dequeue(struct sock * parent,struct socket * newsock)403 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
404 struct socket *newsock)
405 {
406 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
407 struct sock *sk;
408
409 llcp_parent = nfc_llcp_sock(parent);
410
411 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
412 accept_queue) {
413 sk = &lsk->sk;
414 lock_sock(sk);
415
416 if (sk->sk_state == LLCP_CLOSED) {
417 release_sock(sk);
418 nfc_llcp_accept_unlink(sk);
419 continue;
420 }
421
422 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
423 list_del_init(&lsk->accept_queue);
424 sock_put(sk);
425
426 if (newsock)
427 sock_graft(sk, newsock);
428
429 release_sock(sk);
430
431 pr_debug("Returning sk state %d\n", sk->sk_state);
432
433 sk_acceptq_removed(parent);
434
435 return sk;
436 }
437
438 release_sock(sk);
439 }
440
441 return NULL;
442 }
443
llcp_sock_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)444 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
445 int flags, bool kern)
446 {
447 DECLARE_WAITQUEUE(wait, current);
448 struct sock *sk = sock->sk, *new_sk;
449 long timeo;
450 int ret = 0;
451
452 pr_debug("parent %p\n", sk);
453
454 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
455
456 if (sk->sk_state != LLCP_LISTEN) {
457 ret = -EBADFD;
458 goto error;
459 }
460
461 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
462
463 /* Wait for an incoming connection. */
464 add_wait_queue_exclusive(sk_sleep(sk), &wait);
465 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
466 set_current_state(TASK_INTERRUPTIBLE);
467
468 if (!timeo) {
469 ret = -EAGAIN;
470 break;
471 }
472
473 if (signal_pending(current)) {
474 ret = sock_intr_errno(timeo);
475 break;
476 }
477
478 release_sock(sk);
479 timeo = schedule_timeout(timeo);
480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
481 }
482 __set_current_state(TASK_RUNNING);
483 remove_wait_queue(sk_sleep(sk), &wait);
484
485 if (ret)
486 goto error;
487
488 newsock->state = SS_CONNECTED;
489
490 pr_debug("new socket %p\n", new_sk);
491
492 error:
493 release_sock(sk);
494
495 return ret;
496 }
497
llcp_sock_getname(struct socket * sock,struct sockaddr * uaddr,int peer)498 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
499 int peer)
500 {
501 struct sock *sk = sock->sk;
502 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
503 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
504
505 if (llcp_sock == NULL || llcp_sock->dev == NULL)
506 return -EBADFD;
507
508 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
509 llcp_sock->dsap, llcp_sock->ssap);
510
511 memset(llcp_addr, 0, sizeof(*llcp_addr));
512
513 lock_sock(sk);
514 if (!llcp_sock->dev) {
515 release_sock(sk);
516 return -EBADFD;
517 }
518 llcp_addr->sa_family = AF_NFC;
519 llcp_addr->dev_idx = llcp_sock->dev->idx;
520 llcp_addr->target_idx = llcp_sock->target_idx;
521 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
522 llcp_addr->dsap = llcp_sock->dsap;
523 llcp_addr->ssap = llcp_sock->ssap;
524 llcp_addr->service_name_len = llcp_sock->service_name_len;
525 memcpy(llcp_addr->service_name, llcp_sock->service_name,
526 llcp_addr->service_name_len);
527 release_sock(sk);
528
529 return sizeof(struct sockaddr_nfc_llcp);
530 }
531
llcp_accept_poll(struct sock * parent)532 static inline __poll_t llcp_accept_poll(struct sock *parent)
533 {
534 struct nfc_llcp_sock *llcp_sock, *parent_sock;
535 struct sock *sk;
536
537 parent_sock = nfc_llcp_sock(parent);
538
539 list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
540 accept_queue) {
541 sk = &llcp_sock->sk;
542
543 if (sk->sk_state == LLCP_CONNECTED)
544 return EPOLLIN | EPOLLRDNORM;
545 }
546
547 return 0;
548 }
549
llcp_sock_poll(struct file * file,struct socket * sock,poll_table * wait)550 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
551 poll_table *wait)
552 {
553 struct sock *sk = sock->sk;
554 __poll_t mask = 0;
555
556 pr_debug("%p\n", sk);
557
558 sock_poll_wait(file, sock, wait);
559
560 if (sk->sk_state == LLCP_LISTEN)
561 return llcp_accept_poll(sk);
562
563 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
564 mask |= EPOLLERR |
565 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
566
567 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
568 mask |= EPOLLIN | EPOLLRDNORM;
569
570 if (sk->sk_state == LLCP_CLOSED)
571 mask |= EPOLLHUP;
572
573 if (sk->sk_shutdown & RCV_SHUTDOWN)
574 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
575
576 if (sk->sk_shutdown == SHUTDOWN_MASK)
577 mask |= EPOLLHUP;
578
579 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
580 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
581 else
582 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
583
584 pr_debug("mask 0x%x\n", mask);
585
586 return mask;
587 }
588
llcp_sock_release(struct socket * sock)589 static int llcp_sock_release(struct socket *sock)
590 {
591 struct sock *sk = sock->sk;
592 struct nfc_llcp_local *local;
593 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
594 int err = 0;
595
596 if (!sk)
597 return 0;
598
599 pr_debug("%p\n", sk);
600
601 local = llcp_sock->local;
602 if (local == NULL) {
603 err = -ENODEV;
604 goto out;
605 }
606
607 lock_sock(sk);
608
609 /* Send a DISC */
610 if (sk->sk_state == LLCP_CONNECTED)
611 nfc_llcp_send_disconnect(llcp_sock);
612
613 if (sk->sk_state == LLCP_LISTEN) {
614 struct nfc_llcp_sock *lsk, *n;
615 struct sock *accept_sk;
616
617 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
618 accept_queue) {
619 accept_sk = &lsk->sk;
620 lock_sock(accept_sk);
621
622 nfc_llcp_send_disconnect(lsk);
623 nfc_llcp_accept_unlink(accept_sk);
624
625 release_sock(accept_sk);
626 }
627 }
628
629 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
630 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
631
632 release_sock(sk);
633
634 /* Keep this sock alive and therefore do not remove it from the sockets
635 * list until the DISC PDU has been actually sent. Otherwise we would
636 * reply with DM PDUs before sending the DISC one.
637 */
638 if (sk->sk_state == LLCP_DISCONNECTING)
639 return err;
640
641 if (sock->type == SOCK_RAW)
642 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
643 else
644 nfc_llcp_sock_unlink(&local->sockets, sk);
645
646 out:
647 sock_orphan(sk);
648 sock_put(sk);
649
650 return err;
651 }
652
llcp_sock_connect(struct socket * sock,struct sockaddr * _addr,int len,int flags)653 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
654 int len, int flags)
655 {
656 struct sock *sk = sock->sk;
657 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
658 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
659 struct nfc_dev *dev;
660 struct nfc_llcp_local *local;
661 int ret = 0;
662
663 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
664
665 if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
666 return -EINVAL;
667
668 if (addr->service_name_len == 0 && addr->dsap == 0)
669 return -EINVAL;
670
671 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
672 addr->target_idx, addr->nfc_protocol);
673
674 lock_sock(sk);
675
676 if (sk->sk_state == LLCP_CONNECTED) {
677 ret = -EISCONN;
678 goto error;
679 }
680 if (sk->sk_state == LLCP_CONNECTING) {
681 ret = -EINPROGRESS;
682 goto error;
683 }
684
685 dev = nfc_get_device(addr->dev_idx);
686 if (dev == NULL) {
687 ret = -ENODEV;
688 goto error;
689 }
690
691 local = nfc_llcp_find_local(dev);
692 if (local == NULL) {
693 ret = -ENODEV;
694 goto put_dev;
695 }
696
697 device_lock(&dev->dev);
698 if (dev->dep_link_up == false) {
699 ret = -ENOLINK;
700 device_unlock(&dev->dev);
701 goto put_dev;
702 }
703 device_unlock(&dev->dev);
704
705 if (local->rf_mode == NFC_RF_INITIATOR &&
706 addr->target_idx != local->target_idx) {
707 ret = -ENOLINK;
708 goto put_dev;
709 }
710
711 llcp_sock->dev = dev;
712 llcp_sock->local = nfc_llcp_local_get(local);
713 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
714 if (llcp_sock->ssap == LLCP_SAP_MAX) {
715 nfc_llcp_local_put(llcp_sock->local);
716 llcp_sock->local = NULL;
717 ret = -ENOMEM;
718 goto put_dev;
719 }
720
721 llcp_sock->reserved_ssap = llcp_sock->ssap;
722
723 if (addr->service_name_len == 0)
724 llcp_sock->dsap = addr->dsap;
725 else
726 llcp_sock->dsap = LLCP_SAP_SDP;
727 llcp_sock->nfc_protocol = addr->nfc_protocol;
728 llcp_sock->service_name_len = min_t(unsigned int,
729 addr->service_name_len,
730 NFC_LLCP_MAX_SERVICE_NAME);
731 llcp_sock->service_name = kmemdup(addr->service_name,
732 llcp_sock->service_name_len,
733 GFP_KERNEL);
734 if (!llcp_sock->service_name) {
735 ret = -ENOMEM;
736 goto sock_llcp_release;
737 }
738
739 nfc_llcp_sock_link(&local->connecting_sockets, sk);
740
741 ret = nfc_llcp_send_connect(llcp_sock);
742 if (ret)
743 goto sock_unlink;
744
745 sk->sk_state = LLCP_CONNECTING;
746
747 ret = sock_wait_state(sk, LLCP_CONNECTED,
748 sock_sndtimeo(sk, flags & O_NONBLOCK));
749 if (ret && ret != -EINPROGRESS)
750 goto sock_unlink;
751
752 release_sock(sk);
753
754 return ret;
755
756 sock_unlink:
757 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
758 kfree(llcp_sock->service_name);
759 llcp_sock->service_name = NULL;
760
761 sock_llcp_release:
762 nfc_llcp_put_ssap(local, llcp_sock->ssap);
763 nfc_llcp_local_put(llcp_sock->local);
764 llcp_sock->local = NULL;
765
766 put_dev:
767 nfc_put_device(dev);
768
769 error:
770 release_sock(sk);
771 return ret;
772 }
773
llcp_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)774 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
775 size_t len)
776 {
777 struct sock *sk = sock->sk;
778 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
779 int ret;
780
781 pr_debug("sock %p sk %p", sock, sk);
782
783 ret = sock_error(sk);
784 if (ret)
785 return ret;
786
787 if (msg->msg_flags & MSG_OOB)
788 return -EOPNOTSUPP;
789
790 lock_sock(sk);
791
792 if (sk->sk_type == SOCK_DGRAM) {
793 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
794 msg->msg_name);
795
796 if (msg->msg_namelen < sizeof(*addr)) {
797 release_sock(sk);
798 return -EINVAL;
799 }
800
801 release_sock(sk);
802
803 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
804 msg, len);
805 }
806
807 if (sk->sk_state != LLCP_CONNECTED) {
808 release_sock(sk);
809 return -ENOTCONN;
810 }
811
812 release_sock(sk);
813
814 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
815 }
816
llcp_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)817 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
818 size_t len, int flags)
819 {
820 int noblock = flags & MSG_DONTWAIT;
821 struct sock *sk = sock->sk;
822 unsigned int copied, rlen;
823 struct sk_buff *skb, *cskb;
824 int err = 0;
825
826 pr_debug("%p %zu\n", sk, len);
827
828 lock_sock(sk);
829
830 if (sk->sk_state == LLCP_CLOSED &&
831 skb_queue_empty(&sk->sk_receive_queue)) {
832 release_sock(sk);
833 return 0;
834 }
835
836 release_sock(sk);
837
838 if (flags & (MSG_OOB))
839 return -EOPNOTSUPP;
840
841 skb = skb_recv_datagram(sk, flags, noblock, &err);
842 if (!skb) {
843 pr_err("Recv datagram failed state %d %d %d",
844 sk->sk_state, err, sock_error(sk));
845
846 if (sk->sk_shutdown & RCV_SHUTDOWN)
847 return 0;
848
849 return err;
850 }
851
852 rlen = skb->len; /* real length of skb */
853 copied = min_t(unsigned int, rlen, len);
854
855 cskb = skb;
856 if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
857 if (!(flags & MSG_PEEK))
858 skb_queue_head(&sk->sk_receive_queue, skb);
859 return -EFAULT;
860 }
861
862 sock_recv_timestamp(msg, sk, skb);
863
864 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
865 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
866 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
867 msg->msg_name);
868
869 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
870
871 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
872
873 memset(sockaddr, 0, sizeof(*sockaddr));
874 sockaddr->sa_family = AF_NFC;
875 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
876 sockaddr->dsap = ui_cb->dsap;
877 sockaddr->ssap = ui_cb->ssap;
878 }
879
880 /* Mark read part of skb as used */
881 if (!(flags & MSG_PEEK)) {
882
883 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
884 if (sk->sk_type == SOCK_STREAM ||
885 sk->sk_type == SOCK_DGRAM ||
886 sk->sk_type == SOCK_RAW) {
887 skb_pull(skb, copied);
888 if (skb->len) {
889 skb_queue_head(&sk->sk_receive_queue, skb);
890 goto done;
891 }
892 }
893
894 kfree_skb(skb);
895 }
896
897 /* XXX Queue backlogged skbs */
898
899 done:
900 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
901 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
902 copied = rlen;
903
904 return copied;
905 }
906
907 static const struct proto_ops llcp_sock_ops = {
908 .family = PF_NFC,
909 .owner = THIS_MODULE,
910 .bind = llcp_sock_bind,
911 .connect = llcp_sock_connect,
912 .release = llcp_sock_release,
913 .socketpair = sock_no_socketpair,
914 .accept = llcp_sock_accept,
915 .getname = llcp_sock_getname,
916 .poll = llcp_sock_poll,
917 .ioctl = sock_no_ioctl,
918 .listen = llcp_sock_listen,
919 .shutdown = sock_no_shutdown,
920 .setsockopt = nfc_llcp_setsockopt,
921 .getsockopt = nfc_llcp_getsockopt,
922 .sendmsg = llcp_sock_sendmsg,
923 .recvmsg = llcp_sock_recvmsg,
924 .mmap = sock_no_mmap,
925 };
926
927 static const struct proto_ops llcp_rawsock_ops = {
928 .family = PF_NFC,
929 .owner = THIS_MODULE,
930 .bind = llcp_raw_sock_bind,
931 .connect = sock_no_connect,
932 .release = llcp_sock_release,
933 .socketpair = sock_no_socketpair,
934 .accept = sock_no_accept,
935 .getname = llcp_sock_getname,
936 .poll = llcp_sock_poll,
937 .ioctl = sock_no_ioctl,
938 .listen = sock_no_listen,
939 .shutdown = sock_no_shutdown,
940 .sendmsg = sock_no_sendmsg,
941 .recvmsg = llcp_sock_recvmsg,
942 .mmap = sock_no_mmap,
943 };
944
llcp_sock_destruct(struct sock * sk)945 static void llcp_sock_destruct(struct sock *sk)
946 {
947 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
948
949 pr_debug("%p\n", sk);
950
951 if (sk->sk_state == LLCP_CONNECTED)
952 nfc_put_device(llcp_sock->dev);
953
954 skb_queue_purge(&sk->sk_receive_queue);
955
956 nfc_llcp_sock_free(llcp_sock);
957
958 if (!sock_flag(sk, SOCK_DEAD)) {
959 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
960 return;
961 }
962 }
963
nfc_llcp_sock_alloc(struct socket * sock,int type,gfp_t gfp,int kern)964 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
965 {
966 struct sock *sk;
967 struct nfc_llcp_sock *llcp_sock;
968
969 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
970 if (!sk)
971 return NULL;
972
973 llcp_sock = nfc_llcp_sock(sk);
974
975 sock_init_data(sock, sk);
976 sk->sk_state = LLCP_CLOSED;
977 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
978 sk->sk_type = type;
979 sk->sk_destruct = llcp_sock_destruct;
980
981 llcp_sock->ssap = 0;
982 llcp_sock->dsap = LLCP_SAP_SDP;
983 llcp_sock->rw = LLCP_MAX_RW + 1;
984 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
985 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
986 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
987 llcp_sock->remote_ready = 1;
988 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
989 nfc_llcp_socket_remote_param_init(llcp_sock);
990 skb_queue_head_init(&llcp_sock->tx_queue);
991 skb_queue_head_init(&llcp_sock->tx_pending_queue);
992 INIT_LIST_HEAD(&llcp_sock->accept_queue);
993
994 if (sock != NULL)
995 sock->state = SS_UNCONNECTED;
996
997 return sk;
998 }
999
nfc_llcp_sock_free(struct nfc_llcp_sock * sock)1000 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
1001 {
1002 kfree(sock->service_name);
1003
1004 skb_queue_purge(&sock->tx_queue);
1005 skb_queue_purge(&sock->tx_pending_queue);
1006
1007 list_del_init(&sock->accept_queue);
1008
1009 sock->parent = NULL;
1010
1011 nfc_llcp_local_put(sock->local);
1012 }
1013
llcp_sock_create(struct net * net,struct socket * sock,const struct nfc_protocol * nfc_proto,int kern)1014 static int llcp_sock_create(struct net *net, struct socket *sock,
1015 const struct nfc_protocol *nfc_proto, int kern)
1016 {
1017 struct sock *sk;
1018
1019 pr_debug("%p\n", sock);
1020
1021 if (sock->type != SOCK_STREAM &&
1022 sock->type != SOCK_DGRAM &&
1023 sock->type != SOCK_RAW)
1024 return -ESOCKTNOSUPPORT;
1025
1026 if (sock->type == SOCK_RAW) {
1027 if (!capable(CAP_NET_RAW))
1028 return -EPERM;
1029 sock->ops = &llcp_rawsock_ops;
1030 } else {
1031 sock->ops = &llcp_sock_ops;
1032 }
1033
1034 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1035 if (sk == NULL)
1036 return -ENOMEM;
1037
1038 return 0;
1039 }
1040
1041 static const struct nfc_protocol llcp_nfc_proto = {
1042 .id = NFC_SOCKPROTO_LLCP,
1043 .proto = &llcp_sock_proto,
1044 .owner = THIS_MODULE,
1045 .create = llcp_sock_create
1046 };
1047
nfc_llcp_sock_init(void)1048 int __init nfc_llcp_sock_init(void)
1049 {
1050 return nfc_proto_register(&llcp_nfc_proto);
1051 }
1052
nfc_llcp_sock_exit(void)1053 void nfc_llcp_sock_exit(void)
1054 {
1055 nfc_proto_unregister(&llcp_nfc_proto);
1056 }
1057
