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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 | ||
30 | static struct proto llcp_sock_proto = { | |
31 | .name = "NFC_LLCP", | |
32 | .owner = THIS_MODULE, | |
33 | .obj_size = sizeof(struct nfc_llcp_sock), | |
34 | }; | |
35 | ||
36 | static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) | |
37 | { | |
38 | struct sock *sk = sock->sk; | |
39 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40 | struct nfc_llcp_local *local; | |
41 | struct nfc_dev *dev; | |
42 | struct sockaddr_nfc_llcp llcp_addr; | |
43 | int len, ret = 0; | |
44 | ||
45 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
46 | ||
47 | if (!addr || addr->sa_family != AF_NFC) | |
48 | return -EINVAL; | |
49 | ||
50 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
51 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
52 | memcpy(&llcp_addr, addr, len); | |
53 | ||
54 | /* This is going to be a listening socket, dsap must be 0 */ | |
55 | if (llcp_addr.dsap != 0) | |
56 | return -EINVAL; | |
57 | ||
58 | lock_sock(sk); | |
59 | ||
60 | if (sk->sk_state != LLCP_CLOSED) { | |
61 | ret = -EBADFD; | |
62 | goto error; | |
63 | } | |
64 | ||
65 | dev = nfc_get_device(llcp_addr.dev_idx); | |
66 | if (dev == NULL) { | |
67 | ret = -ENODEV; | |
68 | goto error; | |
69 | } | |
70 | ||
71 | local = nfc_llcp_find_local(dev); | |
72 | if (local == NULL) { | |
73 | ret = -ENODEV; | |
74 | goto put_dev; | |
75 | } | |
76 | ||
77 | llcp_sock->dev = dev; | |
78 | llcp_sock->local = local; | |
79 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
80 | llcp_sock->service_name_len = min_t(unsigned int, | |
81 | llcp_addr.service_name_len, NFC_LLCP_MAX_SERVICE_NAME); | |
82 | llcp_sock->service_name = kmemdup(llcp_addr.service_name, | |
83 | llcp_sock->service_name_len, GFP_KERNEL); | |
84 | ||
85 | llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); | |
86 | if (llcp_sock->ssap == LLCP_MAX_SAP) | |
87 | goto put_dev; | |
88 | ||
89 | local->sockets[llcp_sock->ssap] = llcp_sock; | |
90 | ||
91 | pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); | |
92 | ||
93 | sk->sk_state = LLCP_BOUND; | |
94 | ||
95 | put_dev: | |
96 | nfc_put_device(dev); | |
97 | ||
98 | error: | |
99 | release_sock(sk); | |
100 | return ret; | |
101 | } | |
102 | ||
103 | static int llcp_sock_listen(struct socket *sock, int backlog) | |
104 | { | |
105 | struct sock *sk = sock->sk; | |
106 | int ret = 0; | |
107 | ||
108 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
109 | ||
110 | lock_sock(sk); | |
111 | ||
112 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) | |
113 | || sk->sk_state != LLCP_BOUND) { | |
114 | ret = -EBADFD; | |
115 | goto error; | |
116 | } | |
117 | ||
118 | sk->sk_max_ack_backlog = backlog; | |
119 | sk->sk_ack_backlog = 0; | |
120 | ||
121 | pr_debug("Socket listening\n"); | |
122 | sk->sk_state = LLCP_LISTEN; | |
123 | ||
124 | error: | |
125 | release_sock(sk); | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | void nfc_llcp_accept_unlink(struct sock *sk) | |
131 | { | |
132 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
133 | ||
134 | pr_debug("state %d\n", sk->sk_state); | |
135 | ||
136 | list_del_init(&llcp_sock->accept_queue); | |
137 | sk_acceptq_removed(llcp_sock->parent); | |
138 | llcp_sock->parent = NULL; | |
139 | ||
140 | sock_put(sk); | |
141 | } | |
142 | ||
143 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
144 | { | |
145 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
146 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
147 | ||
148 | /* Lock will be free from unlink */ | |
149 | sock_hold(sk); | |
150 | ||
151 | list_add_tail(&llcp_sock->accept_queue, | |
152 | &llcp_sock_parent->accept_queue); | |
153 | llcp_sock->parent = parent; | |
154 | sk_acceptq_added(parent); | |
155 | } | |
156 | ||
157 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
158 | struct socket *newsock) | |
159 | { | |
160 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
161 | struct sock *sk; | |
162 | ||
163 | llcp_parent = nfc_llcp_sock(parent); | |
164 | ||
165 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
166 | accept_queue) { | |
167 | sk = &lsk->sk; | |
168 | lock_sock(sk); | |
169 | ||
170 | if (sk->sk_state == LLCP_CLOSED) { | |
171 | release_sock(sk); | |
172 | nfc_llcp_accept_unlink(sk); | |
173 | continue; | |
174 | } | |
175 | ||
176 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
177 | nfc_llcp_accept_unlink(sk); | |
178 | if (newsock) | |
179 | sock_graft(sk, newsock); | |
180 | ||
181 | release_sock(sk); | |
182 | ||
183 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
184 | ||
185 | return sk; | |
186 | } | |
187 | ||
188 | release_sock(sk); | |
189 | } | |
190 | ||
191 | return NULL; | |
192 | } | |
193 | ||
194 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
195 | int flags) | |
196 | { | |
197 | DECLARE_WAITQUEUE(wait, current); | |
198 | struct sock *sk = sock->sk, *new_sk; | |
199 | long timeo; | |
200 | int ret = 0; | |
201 | ||
202 | pr_debug("parent %p\n", sk); | |
203 | ||
204 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
205 | ||
206 | if (sk->sk_state != LLCP_LISTEN) { | |
207 | ret = -EBADFD; | |
208 | goto error; | |
209 | } | |
210 | ||
211 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
212 | ||
213 | /* Wait for an incoming connection. */ | |
214 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
215 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
216 | set_current_state(TASK_INTERRUPTIBLE); | |
217 | ||
218 | if (!timeo) { | |
219 | ret = -EAGAIN; | |
220 | break; | |
221 | } | |
222 | ||
223 | if (signal_pending(current)) { | |
224 | ret = sock_intr_errno(timeo); | |
225 | break; | |
226 | } | |
227 | ||
228 | release_sock(sk); | |
229 | timeo = schedule_timeout(timeo); | |
230 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
231 | } | |
232 | __set_current_state(TASK_RUNNING); | |
233 | remove_wait_queue(sk_sleep(sk), &wait); | |
234 | ||
235 | if (ret) | |
236 | goto error; | |
237 | ||
238 | newsock->state = SS_CONNECTED; | |
239 | ||
240 | pr_debug("new socket %p\n", new_sk); | |
241 | ||
242 | error: | |
243 | release_sock(sk); | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr, | |
249 | int *len, int peer) | |
250 | { | |
251 | struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *) addr; | |
252 | struct sock *sk = sock->sk; | |
253 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
254 | ||
255 | pr_debug("%p\n", sk); | |
256 | ||
257 | addr->sa_family = AF_NFC; | |
258 | *len = sizeof(struct sockaddr_nfc_llcp); | |
259 | ||
260 | llcp_addr->dev_idx = llcp_sock->dev->idx; | |
261 | llcp_addr->dsap = llcp_sock->dsap; | |
262 | llcp_addr->ssap = llcp_sock->ssap; | |
263 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
264 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
265 | llcp_addr->service_name_len); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
271 | { | |
272 | struct nfc_llcp_sock *llcp_sock, *n, *parent_sock; | |
273 | struct sock *sk; | |
274 | ||
275 | parent_sock = nfc_llcp_sock(parent); | |
276 | ||
277 | list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue, | |
278 | accept_queue) { | |
279 | sk = &llcp_sock->sk; | |
280 | ||
281 | if (sk->sk_state == LLCP_CONNECTED) | |
282 | return POLLIN | POLLRDNORM; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
289 | poll_table *wait) | |
290 | { | |
291 | struct sock *sk = sock->sk; | |
292 | unsigned int mask = 0; | |
293 | ||
294 | pr_debug("%p\n", sk); | |
295 | ||
296 | sock_poll_wait(file, sk_sleep(sk), wait); | |
297 | ||
298 | if (sk->sk_state == LLCP_LISTEN) | |
299 | return llcp_accept_poll(sk); | |
300 | ||
301 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
302 | mask |= POLLERR; | |
303 | ||
304 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
305 | mask |= POLLIN; | |
306 | ||
307 | if (sk->sk_state == LLCP_CLOSED) | |
308 | mask |= POLLHUP; | |
309 | ||
310 | return mask; | |
311 | } | |
312 | ||
313 | static int llcp_sock_release(struct socket *sock) | |
314 | { | |
315 | struct sock *sk = sock->sk; | |
316 | struct nfc_llcp_local *local; | |
317 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
318 | ||
319 | if (!sk) | |
320 | return 0; | |
321 | ||
322 | pr_debug("%p\n", sk); | |
323 | ||
324 | local = llcp_sock->local; | |
325 | if (local == NULL) | |
326 | return -ENODEV; | |
327 | ||
328 | mutex_lock(&local->socket_lock); | |
329 | ||
0c318359 | 330 | if (llcp_sock == local->sockets[llcp_sock->ssap]) |
d646960f | 331 | local->sockets[llcp_sock->ssap] = NULL; |
0c318359 SO |
332 | else |
333 | list_del(&llcp_sock->list); | |
d646960f SO |
334 | |
335 | mutex_unlock(&local->socket_lock); | |
336 | ||
337 | lock_sock(sk); | |
338 | ||
339 | /* Send a DISC */ | |
340 | if (sk->sk_state == LLCP_CONNECTED) | |
341 | nfc_llcp_disconnect(llcp_sock); | |
342 | ||
343 | if (sk->sk_state == LLCP_LISTEN) { | |
344 | struct nfc_llcp_sock *lsk, *n; | |
345 | struct sock *accept_sk; | |
346 | ||
347 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
348 | accept_queue) { | |
349 | accept_sk = &lsk->sk; | |
350 | lock_sock(accept_sk); | |
351 | ||
352 | nfc_llcp_disconnect(lsk); | |
353 | nfc_llcp_accept_unlink(accept_sk); | |
354 | ||
355 | release_sock(accept_sk); | |
356 | ||
357 | sock_set_flag(sk, SOCK_DEAD); | |
358 | sock_orphan(accept_sk); | |
359 | sock_put(accept_sk); | |
360 | } | |
361 | } | |
362 | ||
363 | /* Freeing the SAP */ | |
364 | if ((sk->sk_state == LLCP_CONNECTED | |
365 | && llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) || | |
366 | sk->sk_state == LLCP_BOUND || | |
367 | sk->sk_state == LLCP_LISTEN) | |
368 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
369 | ||
370 | sock_set_flag(sk, SOCK_DEAD); | |
371 | ||
372 | release_sock(sk); | |
373 | ||
374 | sock_orphan(sk); | |
375 | sock_put(sk); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
381 | int len, int flags) | |
382 | { | |
383 | struct sock *sk = sock->sk; | |
384 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
385 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
386 | struct nfc_dev *dev; | |
387 | struct nfc_llcp_local *local; | |
388 | int ret = 0; | |
389 | ||
390 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
391 | ||
392 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
393 | addr->sa_family != AF_NFC) { | |
394 | pr_err("Invalid socket\n"); | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | if (addr->service_name_len == 0 && addr->dsap == 0) { | |
399 | pr_err("Missing service name or dsap\n"); | |
400 | return -EINVAL; | |
401 | } | |
402 | ||
403 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
404 | addr->target_idx, addr->nfc_protocol); | |
405 | ||
406 | lock_sock(sk); | |
407 | ||
408 | if (sk->sk_state == LLCP_CONNECTED) { | |
409 | ret = -EISCONN; | |
410 | goto error; | |
411 | } | |
412 | ||
413 | dev = nfc_get_device(addr->dev_idx); | |
414 | if (dev == NULL) { | |
415 | ret = -ENODEV; | |
416 | goto error; | |
417 | } | |
418 | ||
419 | local = nfc_llcp_find_local(dev); | |
420 | if (local == NULL) { | |
421 | ret = -ENODEV; | |
422 | goto put_dev; | |
423 | } | |
424 | ||
425 | device_lock(&dev->dev); | |
426 | if (dev->dep_link_up == false) { | |
427 | ret = -ENOLINK; | |
428 | device_unlock(&dev->dev); | |
429 | goto put_dev; | |
430 | } | |
431 | device_unlock(&dev->dev); | |
432 | ||
433 | if (local->rf_mode == NFC_RF_INITIATOR && | |
434 | addr->target_idx != local->target_idx) { | |
435 | ret = -ENOLINK; | |
436 | goto put_dev; | |
437 | } | |
438 | ||
439 | llcp_sock->dev = dev; | |
440 | llcp_sock->local = local; | |
441 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); | |
442 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
443 | ret = -ENOMEM; | |
444 | goto put_dev; | |
445 | } | |
446 | if (addr->service_name_len == 0) | |
447 | llcp_sock->dsap = addr->dsap; | |
448 | else | |
449 | llcp_sock->dsap = LLCP_SAP_SDP; | |
450 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
451 | llcp_sock->service_name_len = min_t(unsigned int, | |
452 | addr->service_name_len, NFC_LLCP_MAX_SERVICE_NAME); | |
453 | llcp_sock->service_name = kmemdup(addr->service_name, | |
454 | llcp_sock->service_name_len, GFP_KERNEL); | |
455 | ||
456 | local->sockets[llcp_sock->ssap] = llcp_sock; | |
457 | ||
458 | ret = nfc_llcp_send_connect(llcp_sock); | |
459 | if (ret) | |
460 | goto put_dev; | |
461 | ||
462 | sk->sk_state = LLCP_CONNECTED; | |
463 | ||
464 | release_sock(sk); | |
465 | return 0; | |
466 | ||
467 | put_dev: | |
468 | nfc_put_device(dev); | |
469 | ||
470 | error: | |
471 | release_sock(sk); | |
472 | return ret; | |
473 | } | |
474 | ||
53a0ac2e SO |
475 | static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
476 | struct msghdr *msg, size_t len) | |
477 | { | |
478 | struct sock *sk = sock->sk; | |
479 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
480 | int ret; | |
481 | ||
482 | pr_debug("sock %p sk %p", sock, sk); | |
483 | ||
484 | ret = sock_error(sk); | |
485 | if (ret) | |
486 | return ret; | |
487 | ||
488 | if (msg->msg_flags & MSG_OOB) | |
489 | return -EOPNOTSUPP; | |
490 | ||
491 | lock_sock(sk); | |
492 | ||
493 | if (sk->sk_state != LLCP_CONNECTED) { | |
494 | release_sock(sk); | |
495 | return -ENOTCONN; | |
496 | } | |
497 | ||
498 | release_sock(sk); | |
499 | ||
500 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
501 | } | |
502 | ||
d646960f SO |
503 | static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
504 | struct msghdr *msg, size_t len, int flags) | |
505 | { | |
506 | int noblock = flags & MSG_DONTWAIT; | |
507 | struct sock *sk = sock->sk; | |
508 | unsigned int copied, rlen; | |
509 | struct sk_buff *skb, *cskb; | |
510 | int err = 0; | |
511 | ||
512 | pr_debug("%p %zu\n", sk, len); | |
513 | ||
514 | lock_sock(sk); | |
515 | ||
516 | if (sk->sk_state == LLCP_CLOSED && | |
517 | skb_queue_empty(&sk->sk_receive_queue)) { | |
518 | release_sock(sk); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | release_sock(sk); | |
523 | ||
524 | if (flags & (MSG_OOB)) | |
525 | return -EOPNOTSUPP; | |
526 | ||
527 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
528 | if (!skb) { | |
529 | pr_err("Recv datagram failed state %d %d %d", | |
530 | sk->sk_state, err, sock_error(sk)); | |
531 | ||
532 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
533 | return 0; | |
534 | ||
535 | return err; | |
536 | } | |
537 | ||
538 | rlen = skb->len; /* real length of skb */ | |
539 | copied = min_t(unsigned int, rlen, len); | |
540 | ||
541 | cskb = skb; | |
542 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
543 | if (!(flags & MSG_PEEK)) | |
544 | skb_queue_head(&sk->sk_receive_queue, skb); | |
545 | return -EFAULT; | |
546 | } | |
547 | ||
548 | /* Mark read part of skb as used */ | |
549 | if (!(flags & MSG_PEEK)) { | |
550 | ||
551 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
552 | if (sk->sk_type == SOCK_STREAM) { | |
553 | skb_pull(skb, copied); | |
554 | if (skb->len) { | |
555 | skb_queue_head(&sk->sk_receive_queue, skb); | |
556 | goto done; | |
557 | } | |
558 | } | |
559 | ||
560 | kfree_skb(skb); | |
561 | } | |
562 | ||
563 | /* XXX Queue backlogged skbs */ | |
564 | ||
565 | done: | |
566 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
567 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
568 | copied = rlen; | |
569 | ||
570 | return copied; | |
571 | } | |
572 | ||
573 | static const struct proto_ops llcp_sock_ops = { | |
574 | .family = PF_NFC, | |
575 | .owner = THIS_MODULE, | |
576 | .bind = llcp_sock_bind, | |
577 | .connect = llcp_sock_connect, | |
578 | .release = llcp_sock_release, | |
579 | .socketpair = sock_no_socketpair, | |
580 | .accept = llcp_sock_accept, | |
581 | .getname = llcp_sock_getname, | |
582 | .poll = llcp_sock_poll, | |
583 | .ioctl = sock_no_ioctl, | |
584 | .listen = llcp_sock_listen, | |
585 | .shutdown = sock_no_shutdown, | |
586 | .setsockopt = sock_no_setsockopt, | |
587 | .getsockopt = sock_no_getsockopt, | |
53a0ac2e | 588 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
589 | .recvmsg = llcp_sock_recvmsg, |
590 | .mmap = sock_no_mmap, | |
591 | }; | |
592 | ||
593 | static void llcp_sock_destruct(struct sock *sk) | |
594 | { | |
595 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
596 | ||
597 | pr_debug("%p\n", sk); | |
598 | ||
599 | if (sk->sk_state == LLCP_CONNECTED) | |
600 | nfc_put_device(llcp_sock->dev); | |
601 | ||
602 | skb_queue_purge(&sk->sk_receive_queue); | |
603 | ||
604 | nfc_llcp_sock_free(llcp_sock); | |
605 | ||
606 | if (!sock_flag(sk, SOCK_DEAD)) { | |
607 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
608 | return; | |
609 | } | |
610 | } | |
611 | ||
612 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) | |
613 | { | |
614 | struct sock *sk; | |
615 | struct nfc_llcp_sock *llcp_sock; | |
616 | ||
617 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto); | |
618 | if (!sk) | |
619 | return NULL; | |
620 | ||
621 | llcp_sock = nfc_llcp_sock(sk); | |
622 | ||
623 | sock_init_data(sock, sk); | |
624 | sk->sk_state = LLCP_CLOSED; | |
625 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
626 | sk->sk_type = type; | |
627 | sk->sk_destruct = llcp_sock_destruct; | |
628 | ||
629 | llcp_sock->ssap = 0; | |
630 | llcp_sock->dsap = LLCP_SAP_SDP; | |
631 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; | |
632 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
633 | llcp_sock->remote_ready = 1; | |
634 | skb_queue_head_init(&llcp_sock->tx_queue); | |
635 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
636 | skb_queue_head_init(&llcp_sock->tx_backlog_queue); | |
637 | INIT_LIST_HEAD(&llcp_sock->list); | |
638 | INIT_LIST_HEAD(&llcp_sock->accept_queue); | |
639 | ||
640 | if (sock != NULL) | |
641 | sock->state = SS_UNCONNECTED; | |
642 | ||
643 | return sk; | |
644 | } | |
645 | ||
646 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
647 | { | |
648 | kfree(sock->service_name); | |
649 | ||
650 | skb_queue_purge(&sock->tx_queue); | |
651 | skb_queue_purge(&sock->tx_pending_queue); | |
652 | skb_queue_purge(&sock->tx_backlog_queue); | |
653 | ||
654 | list_del_init(&sock->accept_queue); | |
655 | ||
656 | sock->parent = NULL; | |
657 | } | |
658 | ||
659 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
660 | const struct nfc_protocol *nfc_proto) | |
661 | { | |
662 | struct sock *sk; | |
663 | ||
664 | pr_debug("%p\n", sock); | |
665 | ||
666 | if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM) | |
667 | return -ESOCKTNOSUPPORT; | |
668 | ||
669 | sock->ops = &llcp_sock_ops; | |
670 | ||
671 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC); | |
672 | if (sk == NULL) | |
673 | return -ENOMEM; | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static const struct nfc_protocol llcp_nfc_proto = { | |
679 | .id = NFC_SOCKPROTO_LLCP, | |
680 | .proto = &llcp_sock_proto, | |
681 | .owner = THIS_MODULE, | |
682 | .create = llcp_sock_create | |
683 | }; | |
684 | ||
685 | int __init nfc_llcp_sock_init(void) | |
686 | { | |
687 | return nfc_proto_register(&llcp_nfc_proto); | |
688 | } | |
689 | ||
690 | void nfc_llcp_sock_exit(void) | |
691 | { | |
692 | nfc_proto_unregister(&llcp_nfc_proto); | |
693 | } |