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NFC: UI frame sending routine implementation
[linux-block.git] / net / nfc / llcp / sock.c
CommitLineData
d646960f
SO		 1/*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/nfc.h>
26
27#include "../nfc.h"
28#include "llcp.h"
29
ff353d86
SO		 30static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
31{
32 DECLARE_WAITQUEUE(wait, current);
33 int err = 0;
34
35 pr_debug("sk %p", sk);
36
37 add_wait_queue(sk_sleep(sk), &wait);
38 set_current_state(TASK_INTERRUPTIBLE);
39
40 while (sk->sk_state != state) {
41 if (!timeo) {
42 err = -EINPROGRESS;
43 break;
44 }
45
46 if (signal_pending(current)) {
47 err = sock_intr_errno(timeo);
48 break;
49 }
50
51 release_sock(sk);
52 timeo = schedule_timeout(timeo);
53 lock_sock(sk);
54 set_current_state(TASK_INTERRUPTIBLE);
55
56 err = sock_error(sk);
57 if (err)
58 break;
59 }
60
61 __set_current_state(TASK_RUNNING);
62 remove_wait_queue(sk_sleep(sk), &wait);
63 return err;
64}
65
d646960f
SO		 66static struct proto llcp_sock_proto = {
67 .name = "NFC_LLCP",
68 .owner = THIS_MODULE,
69 .obj_size = sizeof(struct nfc_llcp_sock),
70};
71
72static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
73{
74 struct sock *sk = sock->sk;
75 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
76 struct nfc_llcp_local *local;
77 struct nfc_dev *dev;
78 struct sockaddr_nfc_llcp llcp_addr;
79 int len, ret = 0;
80
d646960f
SO		 81 if (!addr || addr->sa_family != AF_NFC)
82 return -EINVAL;
83
c66433dc
SO		 84 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
85
d646960f
SO		 86 memset(&llcp_addr, 0, sizeof(llcp_addr));
87 len = min_t(unsigned int, sizeof(llcp_addr), alen);
88 memcpy(&llcp_addr, addr, len);
89
90 /* This is going to be a listening socket, dsap must be 0 */
91 if (llcp_addr.dsap != 0)
92 return -EINVAL;
93
94 lock_sock(sk);
95
96 if (sk->sk_state != LLCP_CLOSED) {
97 ret = -EBADFD;
98 goto error;
99 }
100
101 dev = nfc_get_device(llcp_addr.dev_idx);
102 if (dev == NULL) {
103 ret = -ENODEV;
104 goto error;
105 }
106
107 local = nfc_llcp_find_local(dev);
108 if (local == NULL) {
109 ret = -ENODEV;
110 goto put_dev;
111 }
112
113 llcp_sock->dev = dev;
c7aa1225 114 llcp_sock->local = nfc_llcp_local_get(local);
d646960f
SO		 115 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
116 llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1
SO		 117 llcp_addr.service_name_len,
118 NFC_LLCP_MAX_SERVICE_NAME);
d646960f 119 llcp_sock->service_name = kmemdup(llcp_addr.service_name,
427a2eb1
SO		 120 llcp_sock->service_name_len,
121 GFP_KERNEL);
d646960f
SO		 122
123 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
8b7e8eda
SO		 124 if (llcp_sock->ssap == LLCP_SAP_MAX) {
125 ret = -EADDRINUSE;
d646960f 126 goto put_dev;
8b7e8eda 127 }
d646960f 128
cbbf4721
SO		 129 llcp_sock->reserved_ssap = llcp_sock->ssap;
130
a69f32af 131 nfc_llcp_sock_link(&local->sockets, sk);
d646960f
SO		 132
133 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
134
135 sk->sk_state = LLCP_BOUND;
136
137put_dev:
138 nfc_put_device(dev);
139
140error:
141 release_sock(sk);
142 return ret;
143}
144
4463523b
TE		 145static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
146 int alen)
147{
148 struct sock *sk = sock->sk;
149 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
150 struct nfc_llcp_local *local;
151 struct nfc_dev *dev;
152 struct sockaddr_nfc_llcp llcp_addr;
153 int len, ret = 0;
154
155 if (!addr || 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
191put_dev:
192 nfc_put_device(dev);
193
194error:
195 release_sock(sk);
196 return ret;
197}
198
d646960f
SO		 199static 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
874934f4
SJ		 208 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
209 sk->sk_state != LLCP_BOUND) {
d646960f
SO		 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
220error:
221 release_sock(sk);
222
223 return ret;
224}
225
226void nfc_llcp_accept_unlink(struct sock *sk)
227{
228 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
229
230 pr_debug("state %d\n", sk->sk_state);
231
232 list_del_init(&llcp_sock->accept_queue);
233 sk_acceptq_removed(llcp_sock->parent);
234 llcp_sock->parent = NULL;
235
236 sock_put(sk);
237}
238
239void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
240{
241 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
242 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
243
244 /* Lock will be free from unlink */
245 sock_hold(sk);
246
247 list_add_tail(&llcp_sock->accept_queue,
427a2eb1 248 &llcp_sock_parent->accept_queue);
d646960f
SO		 249 llcp_sock->parent = parent;
250 sk_acceptq_added(parent);
251}
252
253struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
427a2eb1 254 struct socket *newsock)
d646960f
SO		 255{
256 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
257 struct sock *sk;
258
259 llcp_parent = nfc_llcp_sock(parent);
260
261 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
427a2eb1 262 accept_queue) {
d646960f
SO		 263 sk = &lsk->sk;
264 lock_sock(sk);
265
266 if (sk->sk_state == LLCP_CLOSED) {
267 release_sock(sk);
268 nfc_llcp_accept_unlink(sk);
269 continue;
270 }
271
272 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
273 nfc_llcp_accept_unlink(sk);
274 if (newsock)
275 sock_graft(sk, newsock);
276
277 release_sock(sk);
278
279 pr_debug("Returning sk state %d\n", sk->sk_state);
280
281 return sk;
282 }
283
284 release_sock(sk);
285 }
286
287 return NULL;
288}
289
290static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
427a2eb1 291 int flags)
d646960f
SO		 292{
293 DECLARE_WAITQUEUE(wait, current);
294 struct sock *sk = sock->sk, *new_sk;
295 long timeo;
296 int ret = 0;
297
298 pr_debug("parent %p\n", sk);
299
300 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
301
302 if (sk->sk_state != LLCP_LISTEN) {
303 ret = -EBADFD;
304 goto error;
305 }
306
307 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
308
309 /* Wait for an incoming connection. */
310 add_wait_queue_exclusive(sk_sleep(sk), &wait);
311 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
312 set_current_state(TASK_INTERRUPTIBLE);
313
314 if (!timeo) {
315 ret = -EAGAIN;
316 break;
317 }
318
319 if (signal_pending(current)) {
320 ret = sock_intr_errno(timeo);
321 break;
322 }
323
324 release_sock(sk);
325 timeo = schedule_timeout(timeo);
326 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
327 }
328 __set_current_state(TASK_RUNNING);
329 remove_wait_queue(sk_sleep(sk), &wait);
330
331 if (ret)
332 goto error;
333
334 newsock->state = SS_CONNECTED;
335
336 pr_debug("new socket %p\n", new_sk);
337
338error:
339 release_sock(sk);
340
341 return ret;
342}
343
12e5bdfe 344static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
d646960f
SO		 345 int *len, int peer)
346{
d646960f
SO		 347 struct sock *sk = sock->sk;
348 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
12e5bdfe 349 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
d646960f 350
fe3c094a
SO		 351 if (llcp_sock == NULL || llcp_sock->dev == NULL)
352 return -EBADFD;
353
12e5bdfe
SO		 354 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
355 llcp_sock->dsap, llcp_sock->ssap);
d646960f 356
12e5bdfe
SO		 357 uaddr->sa_family = AF_NFC;
358
d646960f
SO		 359 *len = sizeof(struct sockaddr_nfc_llcp);
360
361 llcp_addr->dev_idx = llcp_sock->dev->idx;
12e5bdfe 362 llcp_addr->target_idx = llcp_sock->target_idx;
d646960f
SO		 363 llcp_addr->dsap = llcp_sock->dsap;
364 llcp_addr->ssap = llcp_sock->ssap;
365 llcp_addr->service_name_len = llcp_sock->service_name_len;
366 memcpy(llcp_addr->service_name, llcp_sock->service_name,
427a2eb1 367 llcp_addr->service_name_len);
d646960f
SO		 368
369 return 0;
370}
371
372static inline unsigned int llcp_accept_poll(struct sock *parent)
373{
374 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
375 struct sock *sk;
376
377 parent_sock = nfc_llcp_sock(parent);
378
379 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
427a2eb1 380 accept_queue) {
d646960f
SO		 381 sk = &llcp_sock->sk;
382
383 if (sk->sk_state == LLCP_CONNECTED)
384 return POLLIN | POLLRDNORM;
385 }
386
387 return 0;
388}
389
390static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
427a2eb1 391 poll_table *wait)
d646960f
SO		 392{
393 struct sock *sk = sock->sk;
394 unsigned int mask = 0;
395
396 pr_debug("%p\n", sk);
397
398 sock_poll_wait(file, sk_sleep(sk), wait);
399
400 if (sk->sk_state == LLCP_LISTEN)
401 return llcp_accept_poll(sk);
402
403 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
404 mask |= POLLERR;
405
406 if (!skb_queue_empty(&sk->sk_receive_queue))
4260c13b 407 mask |= POLLIN | POLLRDNORM;
d646960f
SO		 408
409 if (sk->sk_state == LLCP_CLOSED)
410 mask |= POLLHUP;
411
4260c13b
SO		 412 if (sk->sk_shutdown & RCV_SHUTDOWN)
413 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
414
415 if (sk->sk_shutdown == SHUTDOWN_MASK)
416 mask |= POLLHUP;
417
418 if (sock_writeable(sk))
419 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
420 else
421 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
422
423 pr_debug("mask 0x%x\n", mask);
424
d646960f
SO		 425 return mask;
426}
427
428static int llcp_sock_release(struct socket *sock)
429{
430 struct sock *sk = sock->sk;
431 struct nfc_llcp_local *local;
432 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
40c75f81 433 int err = 0;
d646960f
SO		 434
435 if (!sk)
436 return 0;
437
438 pr_debug("%p\n", sk);
439
440 local = llcp_sock->local;
40c75f81
SO		 441 if (local == NULL) {
442 err = -ENODEV;
443 goto out;
444 }
d646960f 445
d646960f
SO		 446 lock_sock(sk);
447
448 /* Send a DISC */
449 if (sk->sk_state == LLCP_CONNECTED)
450 nfc_llcp_disconnect(llcp_sock);
451
452 if (sk->sk_state == LLCP_LISTEN) {
453 struct nfc_llcp_sock *lsk, *n;
454 struct sock *accept_sk;
455
456 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1 457 accept_queue) {
d646960f
SO		 458 accept_sk = &lsk->sk;
459 lock_sock(accept_sk);
460
461 nfc_llcp_disconnect(lsk);
462 nfc_llcp_accept_unlink(accept_sk);
463
464 release_sock(accept_sk);
465
d646960f 466 sock_orphan(accept_sk);
d646960f
SO		 467 }
468 }
469
cbbf4721
SO		 470 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
471 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
d646960f 472
d646960f
SO		 473 release_sock(sk);
474
4463523b
TE		 475 if (sock->type == SOCK_RAW)
476 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
477 else
478 nfc_llcp_sock_unlink(&local->sockets, sk);
a69f32af 479
40c75f81 480out:
d646960f
SO		 481 sock_orphan(sk);
482 sock_put(sk);
483
40c75f81 484 return err;
d646960f
SO		 485}
486
487static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
427a2eb1 488 int len, int flags)
d646960f
SO		 489{
490 struct sock *sk = sock->sk;
491 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
492 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
493 struct nfc_dev *dev;
494 struct nfc_llcp_local *local;
495 int ret = 0;
496
497 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
498
499 if (!addr || len < sizeof(struct sockaddr_nfc) ||
32418cfe 500 addr->sa_family != AF_NFC)
d646960f 501 return -EINVAL;
d646960f 502
32418cfe 503 if (addr->service_name_len == 0 && addr->dsap == 0)
d646960f 504 return -EINVAL;
d646960f
SO		 505
506 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
427a2eb1 507 addr->target_idx, addr->nfc_protocol);
d646960f
SO		 508
509 lock_sock(sk);
510
511 if (sk->sk_state == LLCP_CONNECTED) {
512 ret = -EISCONN;
513 goto error;
514 }
515
516 dev = nfc_get_device(addr->dev_idx);
517 if (dev == NULL) {
518 ret = -ENODEV;
519 goto error;
520 }
521
522 local = nfc_llcp_find_local(dev);
523 if (local == NULL) {
524 ret = -ENODEV;
525 goto put_dev;
526 }
527
528 device_lock(&dev->dev);
529 if (dev->dep_link_up == false) {
530 ret = -ENOLINK;
531 device_unlock(&dev->dev);
532 goto put_dev;
533 }
534 device_unlock(&dev->dev);
535
536 if (local->rf_mode == NFC_RF_INITIATOR &&
427a2eb1 537 addr->target_idx != local->target_idx) {
d646960f
SO		 538 ret = -ENOLINK;
539 goto put_dev;
540 }
541
542 llcp_sock->dev = dev;
c7aa1225 543 llcp_sock->local = nfc_llcp_local_get(local);
93d7e490 544 llcp_sock->miu = llcp_sock->local->remote_miu;
d646960f
SO		 545 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
546 if (llcp_sock->ssap == LLCP_SAP_MAX) {
547 ret = -ENOMEM;
548 goto put_dev;
549 }
cbbf4721
SO		 550
551 llcp_sock->reserved_ssap = llcp_sock->ssap;
552
d646960f
SO		 553 if (addr->service_name_len == 0)
554 llcp_sock->dsap = addr->dsap;
555 else
556 llcp_sock->dsap = LLCP_SAP_SDP;
557 llcp_sock->nfc_protocol = addr->nfc_protocol;
558 llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1
SO		 559 addr->service_name_len,
560 NFC_LLCP_MAX_SERVICE_NAME);
d646960f 561 llcp_sock->service_name = kmemdup(addr->service_name,
427a2eb1
SO		 562 llcp_sock->service_name_len,
563 GFP_KERNEL);
d646960f 564
a69f32af 565 nfc_llcp_sock_link(&local->connecting_sockets, sk);
d646960f
SO		 566
567 ret = nfc_llcp_send_connect(llcp_sock);
568 if (ret)
a69f32af 569 goto sock_unlink;
d646960f 570
ff353d86
SO		 571 ret = sock_wait_state(sk, LLCP_CONNECTED,
572 sock_sndtimeo(sk, flags & O_NONBLOCK));
573 if (ret)
a69f32af 574 goto sock_unlink;
d646960f
SO		 575
576 release_sock(sk);
ff353d86 577
d646960f
SO		 578 return 0;
579
a69f32af
SO		 580sock_unlink:
581 nfc_llcp_put_ssap(local, llcp_sock->ssap);
582
583 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
584
d646960f
SO		 585put_dev:
586 nfc_put_device(dev);
587
588error:
589 release_sock(sk);
590 return ret;
591}
592
53a0ac2e 593static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
427a2eb1 594 struct msghdr *msg, size_t len)
53a0ac2e
SO		 595{
596 struct sock *sk = sock->sk;
597 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
598 int ret;
599
600 pr_debug("sock %p sk %p", sock, sk);
601
602 ret = sock_error(sk);
603 if (ret)
604 return ret;
605
606 if (msg->msg_flags & MSG_OOB)
607 return -EOPNOTSUPP;
608
609 lock_sock(sk);
610
611 if (sk->sk_state != LLCP_CONNECTED) {
612 release_sock(sk);
613 return -ENOTCONN;
614 }
615
616 release_sock(sk);
617
618 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
619}
620
d646960f
SO		 621static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
622 struct msghdr *msg, size_t len, int flags)
623{
624 int noblock = flags & MSG_DONTWAIT;
625 struct sock *sk = sock->sk;
626 unsigned int copied, rlen;
627 struct sk_buff *skb, *cskb;
628 int err = 0;
629
630 pr_debug("%p %zu\n", sk, len);
631
632 lock_sock(sk);
633
634 if (sk->sk_state == LLCP_CLOSED &&
427a2eb1 635 skb_queue_empty(&sk->sk_receive_queue)) {
d646960f
SO		 636 release_sock(sk);
637 return 0;
638 }
639
640 release_sock(sk);
641
642 if (flags & (MSG_OOB))
643 return -EOPNOTSUPP;
644
645 skb = skb_recv_datagram(sk, flags, noblock, &err);
646 if (!skb) {
647 pr_err("Recv datagram failed state %d %d %d",
427a2eb1 648 sk->sk_state, err, sock_error(sk));
d646960f
SO		 649
650 if (sk->sk_shutdown & RCV_SHUTDOWN)
651 return 0;
652
653 return err;
654 }
655
427a2eb1 656 rlen = skb->len; /* real length of skb */
d646960f
SO		 657 copied = min_t(unsigned int, rlen, len);
658
659 cskb = skb;
660 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
661 if (!(flags & MSG_PEEK))
662 skb_queue_head(&sk->sk_receive_queue, skb);
663 return -EFAULT;
664 }
665
31ca61a8
SO		 666 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
667 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
668 struct sockaddr_nfc_llcp sockaddr;
669
670 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
671
672 sockaddr.sa_family = AF_NFC;
673 sockaddr.nfc_protocol = NFC_PROTO_NFC_DEP;
674 sockaddr.dsap = ui_cb->dsap;
675 sockaddr.ssap = ui_cb->ssap;
676
677 memcpy(msg->msg_name, &sockaddr, sizeof(sockaddr));
678 msg->msg_namelen = sizeof(sockaddr);
679 }
680
d646960f
SO		 681 /* Mark read part of skb as used */
682 if (!(flags & MSG_PEEK)) {
683
684 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
31ca61a8
SO		 685 if (sk->sk_type == SOCK_STREAM ||
686 sk->sk_type == SOCK_DGRAM ||
687 sk->sk_type == SOCK_RAW) {
d646960f
SO		 688 skb_pull(skb, copied);
689 if (skb->len) {
690 skb_queue_head(&sk->sk_receive_queue, skb);
691 goto done;
692 }
693 }
694
695 kfree_skb(skb);
696 }
697
698 /* XXX Queue backlogged skbs */
699
700done:
701 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
702 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
703 copied = rlen;
704
705 return copied;
706}
707
708static const struct proto_ops llcp_sock_ops = {
709 .family = PF_NFC,
710 .owner = THIS_MODULE,
711 .bind = llcp_sock_bind,
712 .connect = llcp_sock_connect,
713 .release = llcp_sock_release,
714 .socketpair = sock_no_socketpair,
715 .accept = llcp_sock_accept,
716 .getname = llcp_sock_getname,
717 .poll = llcp_sock_poll,
718 .ioctl = sock_no_ioctl,
719 .listen = llcp_sock_listen,
720 .shutdown = sock_no_shutdown,
721 .setsockopt = sock_no_setsockopt,
722 .getsockopt = sock_no_getsockopt,
53a0ac2e 723 .sendmsg = llcp_sock_sendmsg,
d646960f
SO		 724 .recvmsg = llcp_sock_recvmsg,
725 .mmap = sock_no_mmap,
726};
727
4463523b
TE		 728static const struct proto_ops llcp_rawsock_ops = {
729 .family = PF_NFC,
730 .owner = THIS_MODULE,
731 .bind = llcp_raw_sock_bind,
732 .connect = sock_no_connect,
733 .release = llcp_sock_release,
734 .socketpair = sock_no_socketpair,
735 .accept = sock_no_accept,
736 .getname = llcp_sock_getname,
737 .poll = llcp_sock_poll,
738 .ioctl = sock_no_ioctl,
739 .listen = sock_no_listen,
740 .shutdown = sock_no_shutdown,
741 .setsockopt = sock_no_setsockopt,
742 .getsockopt = sock_no_getsockopt,
743 .sendmsg = sock_no_sendmsg,
744 .recvmsg = llcp_sock_recvmsg,
745 .mmap = sock_no_mmap,
746};
747
d646960f
SO		 748static void llcp_sock_destruct(struct sock *sk)
749{
750 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
751
752 pr_debug("%p\n", sk);
753
754 if (sk->sk_state == LLCP_CONNECTED)
755 nfc_put_device(llcp_sock->dev);
756
757 skb_queue_purge(&sk->sk_receive_queue);
758
759 nfc_llcp_sock_free(llcp_sock);
760
761 if (!sock_flag(sk, SOCK_DEAD)) {
762 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
763 return;
764 }
765}
766
767struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
768{
769 struct sock *sk;
770 struct nfc_llcp_sock *llcp_sock;
771
772 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
773 if (!sk)
774 return NULL;
775
776 llcp_sock = nfc_llcp_sock(sk);
777
778 sock_init_data(sock, sk);
779 sk->sk_state = LLCP_CLOSED;
780 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
781 sk->sk_type = type;
782 sk->sk_destruct = llcp_sock_destruct;
783
784 llcp_sock->ssap = 0;
785 llcp_sock->dsap = LLCP_SAP_SDP;
7a06e586 786 llcp_sock->rw = LLCP_DEFAULT_RW;
93d7e490 787 llcp_sock->miu = LLCP_DEFAULT_MIU;
d646960f
SO		 788 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
789 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
790 llcp_sock->remote_ready = 1;
cbbf4721 791 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
d646960f
SO		 792 skb_queue_head_init(&llcp_sock->tx_queue);
793 skb_queue_head_init(&llcp_sock->tx_pending_queue);
794 skb_queue_head_init(&llcp_sock->tx_backlog_queue);
d646960f
SO		 795 INIT_LIST_HEAD(&llcp_sock->accept_queue);
796
797 if (sock != NULL)
798 sock->state = SS_UNCONNECTED;
799
800 return sk;
801}
802
803void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
804{
805 kfree(sock->service_name);
806
807 skb_queue_purge(&sock->tx_queue);
808 skb_queue_purge(&sock->tx_pending_queue);
809 skb_queue_purge(&sock->tx_backlog_queue);
810
811 list_del_init(&sock->accept_queue);
40c75f81 812
d646960f 813 sock->parent = NULL;
c7aa1225
SO		 814
815 nfc_llcp_local_put(sock->local);
d646960f
SO		 816}
817
818static int llcp_sock_create(struct net *net, struct socket *sock,
427a2eb1 819 const struct nfc_protocol *nfc_proto)
d646960f
SO		 820{
821 struct sock *sk;
822
823 pr_debug("%p\n", sock);
824
4463523b
TE		 825 if (sock->type != SOCK_STREAM &&
826 sock->type != SOCK_DGRAM &&
827 sock->type != SOCK_RAW)
d646960f
SO		 828 return -ESOCKTNOSUPPORT;
829
4463523b
TE		 830 if (sock->type == SOCK_RAW)
831 sock->ops = &llcp_rawsock_ops;
832 else
833 sock->ops = &llcp_sock_ops;
d646960f
SO		 834
835 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
836 if (sk == NULL)
837 return -ENOMEM;
838
839 return 0;
840}
841
842static const struct nfc_protocol llcp_nfc_proto = {
843 .id = NFC_SOCKPROTO_LLCP,
844 .proto = &llcp_sock_proto,
845 .owner = THIS_MODULE,
846 .create = llcp_sock_create
847};
848
849int __init nfc_llcp_sock_init(void)
850{
851 return nfc_proto_register(&llcp_nfc_proto);
852}
853
854void nfc_llcp_sock_exit(void)
855{
856 nfc_proto_unregister(&llcp_nfc_proto);
857}
Linux 6.x block layer and io_uring tree(s)