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Linux/net/nfc/llcp_sock.c

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  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, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
 19 
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/nfc.h>
 24 
 25 #include "nfc.h"
 26 #include "llcp.h"
 27 
 28 static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
 29 {
 30         DECLARE_WAITQUEUE(wait, current);
 31         int err = 0;
 32 
 33         pr_debug("sk %p", sk);
 34 
 35         add_wait_queue(sk_sleep(sk), &wait);
 36         set_current_state(TASK_INTERRUPTIBLE);
 37 
 38         while (sk->sk_state != state) {
 39                 if (!timeo) {
 40                         err = -EINPROGRESS;
 41                         break;
 42                 }
 43 
 44                 if (signal_pending(current)) {
 45                         err = sock_intr_errno(timeo);
 46                         break;
 47                 }
 48 
 49                 release_sock(sk);
 50                 timeo = schedule_timeout(timeo);
 51                 lock_sock(sk);
 52                 set_current_state(TASK_INTERRUPTIBLE);
 53 
 54                 err = sock_error(sk);
 55                 if (err)
 56                         break;
 57         }
 58 
 59         __set_current_state(TASK_RUNNING);
 60         remove_wait_queue(sk_sleep(sk), &wait);
 61         return err;
 62 }
 63 
 64 static struct proto llcp_sock_proto = {
 65         .name     = "NFC_LLCP",
 66         .owner    = THIS_MODULE,
 67         .obj_size = sizeof(struct nfc_llcp_sock),
 68 };
 69 
 70 static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 71 {
 72         struct sock *sk = sock->sk;
 73         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 74         struct nfc_llcp_local *local;
 75         struct nfc_dev *dev;
 76         struct sockaddr_nfc_llcp llcp_addr;
 77         int len, ret = 0;
 78 
 79         if (!addr || addr->sa_family != AF_NFC)
 80                 return -EINVAL;
 81 
 82         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
 83 
 84         memset(&llcp_addr, 0, sizeof(llcp_addr));
 85         len = min_t(unsigned int, sizeof(llcp_addr), alen);
 86         memcpy(&llcp_addr, addr, len);
 87 
 88         /* This is going to be a listening socket, dsap must be 0 */
 89         if (llcp_addr.dsap != 0)
 90                 return -EINVAL;
 91 
 92         lock_sock(sk);
 93 
 94         if (sk->sk_state != LLCP_CLOSED) {
 95                 ret = -EBADFD;
 96                 goto error;
 97         }
 98 
 99         dev = nfc_get_device(llcp_addr.dev_idx);
100         if (dev == NULL) {
101                 ret = -ENODEV;
102                 goto error;
103         }
104 
105         local = nfc_llcp_find_local(dev);
106         if (local == NULL) {
107                 ret = -ENODEV;
108                 goto put_dev;
109         }
110 
111         llcp_sock->dev = dev;
112         llcp_sock->local = nfc_llcp_local_get(local);
113         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
114         llcp_sock->service_name_len = min_t(unsigned int,
115                                             llcp_addr.service_name_len,
116                                             NFC_LLCP_MAX_SERVICE_NAME);
117         llcp_sock->service_name = kmemdup(llcp_addr.service_name,
118                                           llcp_sock->service_name_len,
119                                           GFP_KERNEL);
120 
121         llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
122         if (llcp_sock->ssap == LLCP_SAP_MAX) {
123                 ret = -EADDRINUSE;
124                 goto put_dev;
125         }
126 
127         llcp_sock->reserved_ssap = llcp_sock->ssap;
128 
129         nfc_llcp_sock_link(&local->sockets, sk);
130 
131         pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
132 
133         sk->sk_state = LLCP_BOUND;
134 
135 put_dev:
136         nfc_put_device(dev);
137 
138 error:
139         release_sock(sk);
140         return ret;
141 }
142 
143 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
144                               int alen)
145 {
146         struct sock *sk = sock->sk;
147         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
148         struct nfc_llcp_local *local;
149         struct nfc_dev *dev;
150         struct sockaddr_nfc_llcp llcp_addr;
151         int len, ret = 0;
152 
153         if (!addr || addr->sa_family != AF_NFC)
154                 return -EINVAL;
155 
156         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
157 
158         memset(&llcp_addr, 0, sizeof(llcp_addr));
159         len = min_t(unsigned int, sizeof(llcp_addr), alen);
160         memcpy(&llcp_addr, addr, len);
161 
162         lock_sock(sk);
163 
164         if (sk->sk_state != LLCP_CLOSED) {
165                 ret = -EBADFD;
166                 goto error;
167         }
168 
169         dev = nfc_get_device(llcp_addr.dev_idx);
170         if (dev == NULL) {
171                 ret = -ENODEV;
172                 goto error;
173         }
174 
175         local = nfc_llcp_find_local(dev);
176         if (local == NULL) {
177                 ret = -ENODEV;
178                 goto put_dev;
179         }
180 
181         llcp_sock->dev = dev;
182         llcp_sock->local = nfc_llcp_local_get(local);
183         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
184 
185         nfc_llcp_sock_link(&local->raw_sockets, sk);
186 
187         sk->sk_state = LLCP_BOUND;
188 
189 put_dev:
190         nfc_put_device(dev);
191 
192 error:
193         release_sock(sk);
194         return ret;
195 }
196 
197 static int llcp_sock_listen(struct socket *sock, int backlog)
198 {
199         struct sock *sk = sock->sk;
200         int ret = 0;
201 
202         pr_debug("sk %p backlog %d\n", sk, backlog);
203 
204         lock_sock(sk);
205 
206         if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
207             sk->sk_state != LLCP_BOUND) {
208                 ret = -EBADFD;
209                 goto error;
210         }
211 
212         sk->sk_max_ack_backlog = backlog;
213         sk->sk_ack_backlog = 0;
214 
215         pr_debug("Socket listening\n");
216         sk->sk_state = LLCP_LISTEN;
217 
218 error:
219         release_sock(sk);
220 
221         return ret;
222 }
223 
224 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
225                                char __user *optval, unsigned int optlen)
226 {
227         struct sock *sk = sock->sk;
228         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
229         u32 opt;
230         int err = 0;
231 
232         pr_debug("%p optname %d\n", sk, optname);
233 
234         if (level != SOL_NFC)
235                 return -ENOPROTOOPT;
236 
237         lock_sock(sk);
238 
239         switch (optname) {
240         case NFC_LLCP_RW:
241                 if (sk->sk_state == LLCP_CONNECTED ||
242                     sk->sk_state == LLCP_BOUND ||
243                     sk->sk_state == LLCP_LISTEN) {
244                         err = -EINVAL;
245                         break;
246                 }
247 
248                 if (get_user(opt, (u32 __user *) optval)) {
249                         err = -EFAULT;
250                         break;
251                 }
252 
253                 if (opt > LLCP_MAX_RW) {
254                         err = -EINVAL;
255                         break;
256                 }
257 
258                 llcp_sock->rw = (u8) opt;
259 
260                 break;
261 
262         case NFC_LLCP_MIUX:
263                 if (sk->sk_state == LLCP_CONNECTED ||
264                     sk->sk_state == LLCP_BOUND ||
265                     sk->sk_state == LLCP_LISTEN) {
266                         err = -EINVAL;
267                         break;
268                 }
269 
270                 if (get_user(opt, (u32 __user *) optval)) {
271                         err = -EFAULT;
272                         break;
273                 }
274 
275                 if (opt > LLCP_MAX_MIUX) {
276                         err = -EINVAL;
277                         break;
278                 }
279 
280                 llcp_sock->miux = cpu_to_be16((u16) opt);
281 
282                 break;
283 
284         default:
285                 err = -ENOPROTOOPT;
286                 break;
287         }
288 
289         release_sock(sk);
290 
291         pr_debug("%p rw %d miux %d\n", llcp_sock,
292                  llcp_sock->rw, llcp_sock->miux);
293 
294         return err;
295 }
296 
297 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
298                                char __user *optval, int __user *optlen)
299 {
300         struct nfc_llcp_local *local;
301         struct sock *sk = sock->sk;
302         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
303         int len, err = 0;
304         u16 miux, remote_miu;
305         u8 rw;
306 
307         pr_debug("%p optname %d\n", sk, optname);
308 
309         if (level != SOL_NFC)
310                 return -ENOPROTOOPT;
311 
312         if (get_user(len, optlen))
313                 return -EFAULT;
314 
315         local = llcp_sock->local;
316         if (!local)
317                 return -ENODEV;
318 
319         len = min_t(u32, len, sizeof(u32));
320 
321         lock_sock(sk);
322 
323         switch (optname) {
324         case NFC_LLCP_RW:
325                 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
326                 if (put_user(rw, (u32 __user *) optval))
327                         err = -EFAULT;
328 
329                 break;
330 
331         case NFC_LLCP_MIUX:
332                 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
333                         be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
334 
335                 if (put_user(miux, (u32 __user *) optval))
336                         err = -EFAULT;
337 
338                 break;
339 
340         case NFC_LLCP_REMOTE_MIU:
341                 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
342                                 local->remote_miu : llcp_sock->remote_miu;
343 
344                 if (put_user(remote_miu, (u32 __user *) optval))
345                         err = -EFAULT;
346 
347                 break;
348 
349         case NFC_LLCP_REMOTE_LTO:
350                 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
351                         err = -EFAULT;
352 
353                 break;
354 
355         case NFC_LLCP_REMOTE_RW:
356                 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
357                         err = -EFAULT;
358 
359                 break;
360 
361         default:
362                 err = -ENOPROTOOPT;
363                 break;
364         }
365 
366         release_sock(sk);
367 
368         if (put_user(len, optlen))
369                 return -EFAULT;
370 
371         return err;
372 }
373 
374 void nfc_llcp_accept_unlink(struct sock *sk)
375 {
376         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
377 
378         pr_debug("state %d\n", sk->sk_state);
379 
380         list_del_init(&llcp_sock->accept_queue);
381         sk_acceptq_removed(llcp_sock->parent);
382         llcp_sock->parent = NULL;
383 
384         sock_put(sk);
385 }
386 
387 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
388 {
389         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
390         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
391 
392         /* Lock will be free from unlink */
393         sock_hold(sk);
394 
395         list_add_tail(&llcp_sock->accept_queue,
396                       &llcp_sock_parent->accept_queue);
397         llcp_sock->parent = parent;
398         sk_acceptq_added(parent);
399 }
400 
401 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
402                                      struct socket *newsock)
403 {
404         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
405         struct sock *sk;
406 
407         llcp_parent = nfc_llcp_sock(parent);
408 
409         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
410                                  accept_queue) {
411                 sk = &lsk->sk;
412                 lock_sock(sk);
413 
414                 if (sk->sk_state == LLCP_CLOSED) {
415                         release_sock(sk);
416                         nfc_llcp_accept_unlink(sk);
417                         continue;
418                 }
419 
420                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
421                         list_del_init(&lsk->accept_queue);
422                         sock_put(sk);
423 
424                         if (newsock)
425                                 sock_graft(sk, newsock);
426 
427                         release_sock(sk);
428 
429                         pr_debug("Returning sk state %d\n", sk->sk_state);
430 
431                         sk_acceptq_removed(parent);
432 
433                         return sk;
434                 }
435 
436                 release_sock(sk);
437         }
438 
439         return NULL;
440 }
441 
442 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
443                             int flags)
444 {
445         DECLARE_WAITQUEUE(wait, current);
446         struct sock *sk = sock->sk, *new_sk;
447         long timeo;
448         int ret = 0;
449 
450         pr_debug("parent %p\n", sk);
451 
452         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
453 
454         if (sk->sk_state != LLCP_LISTEN) {
455                 ret = -EBADFD;
456                 goto error;
457         }
458 
459         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
460 
461         /* Wait for an incoming connection. */
462         add_wait_queue_exclusive(sk_sleep(sk), &wait);
463         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
464                 set_current_state(TASK_INTERRUPTIBLE);
465 
466                 if (!timeo) {
467                         ret = -EAGAIN;
468                         break;
469                 }
470 
471                 if (signal_pending(current)) {
472                         ret = sock_intr_errno(timeo);
473                         break;
474                 }
475 
476                 release_sock(sk);
477                 timeo = schedule_timeout(timeo);
478                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
479         }
480         __set_current_state(TASK_RUNNING);
481         remove_wait_queue(sk_sleep(sk), &wait);
482 
483         if (ret)
484                 goto error;
485 
486         newsock->state = SS_CONNECTED;
487 
488         pr_debug("new socket %p\n", new_sk);
489 
490 error:
491         release_sock(sk);
492 
493         return ret;
494 }
495 
496 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
497                              int *len, int peer)
498 {
499         struct sock *sk = sock->sk;
500         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
501         DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
502 
503         if (llcp_sock == NULL || llcp_sock->dev == NULL)
504                 return -EBADFD;
505 
506         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
507                  llcp_sock->dsap, llcp_sock->ssap);
508 
509         memset(llcp_addr, 0, sizeof(*llcp_addr));
510         *len = sizeof(struct sockaddr_nfc_llcp);
511 
512         llcp_addr->sa_family = AF_NFC;
513         llcp_addr->dev_idx = llcp_sock->dev->idx;
514         llcp_addr->target_idx = llcp_sock->target_idx;
515         llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
516         llcp_addr->dsap = llcp_sock->dsap;
517         llcp_addr->ssap = llcp_sock->ssap;
518         llcp_addr->service_name_len = llcp_sock->service_name_len;
519         memcpy(llcp_addr->service_name, llcp_sock->service_name,
520                llcp_addr->service_name_len);
521 
522         return 0;
523 }
524 
525 static inline unsigned int llcp_accept_poll(struct sock *parent)
526 {
527         struct nfc_llcp_sock *llcp_sock, *parent_sock;
528         struct sock *sk;
529 
530         parent_sock = nfc_llcp_sock(parent);
531 
532         list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
533                             accept_queue) {
534                 sk = &llcp_sock->sk;
535 
536                 if (sk->sk_state == LLCP_CONNECTED)
537                         return POLLIN | POLLRDNORM;
538         }
539 
540         return 0;
541 }
542 
543 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
544                                    poll_table *wait)
545 {
546         struct sock *sk = sock->sk;
547         unsigned int mask = 0;
548 
549         pr_debug("%p\n", sk);
550 
551         sock_poll_wait(file, sk_sleep(sk), wait);
552 
553         if (sk->sk_state == LLCP_LISTEN)
554                 return llcp_accept_poll(sk);
555 
556         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
557                 mask |= POLLERR |
558                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
559 
560         if (!skb_queue_empty(&sk->sk_receive_queue))
561                 mask |= POLLIN | POLLRDNORM;
562 
563         if (sk->sk_state == LLCP_CLOSED)
564                 mask |= POLLHUP;
565 
566         if (sk->sk_shutdown & RCV_SHUTDOWN)
567                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
568 
569         if (sk->sk_shutdown == SHUTDOWN_MASK)
570                 mask |= POLLHUP;
571 
572         if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
573                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
574         else
575                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
576 
577         pr_debug("mask 0x%x\n", mask);
578 
579         return mask;
580 }
581 
582 static int llcp_sock_release(struct socket *sock)
583 {
584         struct sock *sk = sock->sk;
585         struct nfc_llcp_local *local;
586         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
587         int err = 0;
588 
589         if (!sk)
590                 return 0;
591 
592         pr_debug("%p\n", sk);
593 
594         local = llcp_sock->local;
595         if (local == NULL) {
596                 err = -ENODEV;
597                 goto out;
598         }
599 
600         lock_sock(sk);
601 
602         /* Send a DISC */
603         if (sk->sk_state == LLCP_CONNECTED)
604                 nfc_llcp_send_disconnect(llcp_sock);
605 
606         if (sk->sk_state == LLCP_LISTEN) {
607                 struct nfc_llcp_sock *lsk, *n;
608                 struct sock *accept_sk;
609 
610                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
611                                          accept_queue) {
612                         accept_sk = &lsk->sk;
613                         lock_sock(accept_sk);
614 
615                         nfc_llcp_send_disconnect(lsk);
616                         nfc_llcp_accept_unlink(accept_sk);
617 
618                         release_sock(accept_sk);
619                 }
620         }
621 
622         if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
623                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
624 
625         release_sock(sk);
626 
627         /* Keep this sock alive and therefore do not remove it from the sockets
628          * list until the DISC PDU has been actually sent. Otherwise we would
629          * reply with DM PDUs before sending the DISC one.
630          */
631         if (sk->sk_state == LLCP_DISCONNECTING)
632                 return err;
633 
634         if (sock->type == SOCK_RAW)
635                 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
636         else
637                 nfc_llcp_sock_unlink(&local->sockets, sk);
638 
639 out:
640         sock_orphan(sk);
641         sock_put(sk);
642 
643         return err;
644 }
645 
646 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
647                              int len, int flags)
648 {
649         struct sock *sk = sock->sk;
650         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
651         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
652         struct nfc_dev *dev;
653         struct nfc_llcp_local *local;
654         int ret = 0;
655 
656         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
657 
658         if (!addr || len < sizeof(struct sockaddr_nfc) ||
659             addr->sa_family != AF_NFC)
660                 return -EINVAL;
661 
662         if (addr->service_name_len == 0 && addr->dsap == 0)
663                 return -EINVAL;
664 
665         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
666                  addr->target_idx, addr->nfc_protocol);
667 
668         lock_sock(sk);
669 
670         if (sk->sk_state == LLCP_CONNECTED) {
671                 ret = -EISCONN;
672                 goto error;
673         }
674 
675         dev = nfc_get_device(addr->dev_idx);
676         if (dev == NULL) {
677                 ret = -ENODEV;
678                 goto error;
679         }
680 
681         local = nfc_llcp_find_local(dev);
682         if (local == NULL) {
683                 ret = -ENODEV;
684                 goto put_dev;
685         }
686 
687         device_lock(&dev->dev);
688         if (dev->dep_link_up == false) {
689                 ret = -ENOLINK;
690                 device_unlock(&dev->dev);
691                 goto put_dev;
692         }
693         device_unlock(&dev->dev);
694 
695         if (local->rf_mode == NFC_RF_INITIATOR &&
696             addr->target_idx != local->target_idx) {
697                 ret = -ENOLINK;
698                 goto put_dev;
699         }
700 
701         llcp_sock->dev = dev;
702         llcp_sock->local = nfc_llcp_local_get(local);
703         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
704         if (llcp_sock->ssap == LLCP_SAP_MAX) {
705                 ret = -ENOMEM;
706                 goto put_dev;
707         }
708 
709         llcp_sock->reserved_ssap = llcp_sock->ssap;
710 
711         if (addr->service_name_len == 0)
712                 llcp_sock->dsap = addr->dsap;
713         else
714                 llcp_sock->dsap = LLCP_SAP_SDP;
715         llcp_sock->nfc_protocol = addr->nfc_protocol;
716         llcp_sock->service_name_len = min_t(unsigned int,
717                                             addr->service_name_len,
718                                             NFC_LLCP_MAX_SERVICE_NAME);
719         llcp_sock->service_name = kmemdup(addr->service_name,
720                                           llcp_sock->service_name_len,
721                                           GFP_KERNEL);
722 
723         nfc_llcp_sock_link(&local->connecting_sockets, sk);
724 
725         ret = nfc_llcp_send_connect(llcp_sock);
726         if (ret)
727                 goto sock_unlink;
728 
729         sk->sk_state = LLCP_CONNECTING;
730 
731         ret = sock_wait_state(sk, LLCP_CONNECTED,
732                               sock_sndtimeo(sk, flags & O_NONBLOCK));
733         if (ret && ret != -EINPROGRESS)
734                 goto sock_unlink;
735 
736         release_sock(sk);
737 
738         return ret;
739 
740 sock_unlink:
741         nfc_llcp_put_ssap(local, llcp_sock->ssap);
742 
743         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
744 
745 put_dev:
746         nfc_put_device(dev);
747 
748 error:
749         release_sock(sk);
750         return ret;
751 }
752 
753 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
754                              struct msghdr *msg, size_t len)
755 {
756         struct sock *sk = sock->sk;
757         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
758         int ret;
759 
760         pr_debug("sock %p sk %p", sock, sk);
761 
762         ret = sock_error(sk);
763         if (ret)
764                 return ret;
765 
766         if (msg->msg_flags & MSG_OOB)
767                 return -EOPNOTSUPP;
768 
769         lock_sock(sk);
770 
771         if (sk->sk_type == SOCK_DGRAM) {
772                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
773                                  msg->msg_name);
774 
775                 if (msg->msg_namelen < sizeof(*addr)) {
776                         release_sock(sk);
777                         return -EINVAL;
778                 }
779 
780                 release_sock(sk);
781 
782                 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
783                                               msg, len);
784         }
785 
786         if (sk->sk_state != LLCP_CONNECTED) {
787                 release_sock(sk);
788                 return -ENOTCONN;
789         }
790 
791         release_sock(sk);
792 
793         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
794 }
795 
796 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
797                              struct msghdr *msg, size_t len, int flags)
798 {
799         int noblock = flags & MSG_DONTWAIT;
800         struct sock *sk = sock->sk;
801         unsigned int copied, rlen;
802         struct sk_buff *skb, *cskb;
803         int err = 0;
804 
805         pr_debug("%p %zu\n", sk, len);
806 
807         lock_sock(sk);
808 
809         if (sk->sk_state == LLCP_CLOSED &&
810             skb_queue_empty(&sk->sk_receive_queue)) {
811                 release_sock(sk);
812                 return 0;
813         }
814 
815         release_sock(sk);
816 
817         if (flags & (MSG_OOB))
818                 return -EOPNOTSUPP;
819 
820         skb = skb_recv_datagram(sk, flags, noblock, &err);
821         if (!skb) {
822                 pr_err("Recv datagram failed state %d %d %d",
823                        sk->sk_state, err, sock_error(sk));
824 
825                 if (sk->sk_shutdown & RCV_SHUTDOWN)
826                         return 0;
827 
828                 return err;
829         }
830 
831         rlen = skb->len;                /* real length of skb */
832         copied = min_t(unsigned int, rlen, len);
833 
834         cskb = skb;
835         if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
836                 if (!(flags & MSG_PEEK))
837                         skb_queue_head(&sk->sk_receive_queue, skb);
838                 return -EFAULT;
839         }
840 
841         sock_recv_timestamp(msg, sk, skb);
842 
843         if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
844                 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
845                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
846                                  msg->msg_name);
847 
848                 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
849 
850                 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
851 
852                 memset(sockaddr, 0, sizeof(*sockaddr));
853                 sockaddr->sa_family = AF_NFC;
854                 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
855                 sockaddr->dsap = ui_cb->dsap;
856                 sockaddr->ssap = ui_cb->ssap;
857         }
858 
859         /* Mark read part of skb as used */
860         if (!(flags & MSG_PEEK)) {
861 
862                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
863                 if (sk->sk_type == SOCK_STREAM ||
864                     sk->sk_type == SOCK_DGRAM ||
865                     sk->sk_type == SOCK_RAW) {
866                         skb_pull(skb, copied);
867                         if (skb->len) {
868                                 skb_queue_head(&sk->sk_receive_queue, skb);
869                                 goto done;
870                         }
871                 }
872 
873                 kfree_skb(skb);
874         }
875 
876         /* XXX Queue backlogged skbs */
877 
878 done:
879         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
880         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
881                 copied = rlen;
882 
883         return copied;
884 }
885 
886 static const struct proto_ops llcp_sock_ops = {
887         .family         = PF_NFC,
888         .owner          = THIS_MODULE,
889         .bind           = llcp_sock_bind,
890         .connect        = llcp_sock_connect,
891         .release        = llcp_sock_release,
892         .socketpair     = sock_no_socketpair,
893         .accept         = llcp_sock_accept,
894         .getname        = llcp_sock_getname,
895         .poll           = llcp_sock_poll,
896         .ioctl          = sock_no_ioctl,
897         .listen         = llcp_sock_listen,
898         .shutdown       = sock_no_shutdown,
899         .setsockopt     = nfc_llcp_setsockopt,
900         .getsockopt     = nfc_llcp_getsockopt,
901         .sendmsg        = llcp_sock_sendmsg,
902         .recvmsg        = llcp_sock_recvmsg,
903         .mmap           = sock_no_mmap,
904 };
905 
906 static const struct proto_ops llcp_rawsock_ops = {
907         .family         = PF_NFC,
908         .owner          = THIS_MODULE,
909         .bind           = llcp_raw_sock_bind,
910         .connect        = sock_no_connect,
911         .release        = llcp_sock_release,
912         .socketpair     = sock_no_socketpair,
913         .accept         = sock_no_accept,
914         .getname        = llcp_sock_getname,
915         .poll           = llcp_sock_poll,
916         .ioctl          = sock_no_ioctl,
917         .listen         = sock_no_listen,
918         .shutdown       = sock_no_shutdown,
919         .setsockopt     = sock_no_setsockopt,
920         .getsockopt     = sock_no_getsockopt,
921         .sendmsg        = sock_no_sendmsg,
922         .recvmsg        = llcp_sock_recvmsg,
923         .mmap           = sock_no_mmap,
924 };
925 
926 static void llcp_sock_destruct(struct sock *sk)
927 {
928         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
929 
930         pr_debug("%p\n", sk);
931 
932         if (sk->sk_state == LLCP_CONNECTED)
933                 nfc_put_device(llcp_sock->dev);
934 
935         skb_queue_purge(&sk->sk_receive_queue);
936 
937         nfc_llcp_sock_free(llcp_sock);
938 
939         if (!sock_flag(sk, SOCK_DEAD)) {
940                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
941                 return;
942         }
943 }
944 
945 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
946 {
947         struct sock *sk;
948         struct nfc_llcp_sock *llcp_sock;
949 
950         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
951         if (!sk)
952                 return NULL;
953 
954         llcp_sock = nfc_llcp_sock(sk);
955 
956         sock_init_data(sock, sk);
957         sk->sk_state = LLCP_CLOSED;
958         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
959         sk->sk_type = type;
960         sk->sk_destruct = llcp_sock_destruct;
961 
962         llcp_sock->ssap = 0;
963         llcp_sock->dsap = LLCP_SAP_SDP;
964         llcp_sock->rw = LLCP_MAX_RW + 1;
965         llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
966         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
967         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
968         llcp_sock->remote_ready = 1;
969         llcp_sock->reserved_ssap = LLCP_SAP_MAX;
970         nfc_llcp_socket_remote_param_init(llcp_sock);
971         skb_queue_head_init(&llcp_sock->tx_queue);
972         skb_queue_head_init(&llcp_sock->tx_pending_queue);
973         INIT_LIST_HEAD(&llcp_sock->accept_queue);
974 
975         if (sock != NULL)
976                 sock->state = SS_UNCONNECTED;
977 
978         return sk;
979 }
980 
981 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
982 {
983         kfree(sock->service_name);
984 
985         skb_queue_purge(&sock->tx_queue);
986         skb_queue_purge(&sock->tx_pending_queue);
987 
988         list_del_init(&sock->accept_queue);
989 
990         sock->parent = NULL;
991 
992         nfc_llcp_local_put(sock->local);
993 }
994 
995 static int llcp_sock_create(struct net *net, struct socket *sock,
996                             const struct nfc_protocol *nfc_proto)
997 {
998         struct sock *sk;
999 
1000         pr_debug("%p\n", sock);
1001 
1002         if (sock->type != SOCK_STREAM &&
1003             sock->type != SOCK_DGRAM &&
1004             sock->type != SOCK_RAW)
1005                 return -ESOCKTNOSUPPORT;
1006 
1007         if (sock->type == SOCK_RAW)
1008                 sock->ops = &llcp_rawsock_ops;
1009         else
1010                 sock->ops = &llcp_sock_ops;
1011 
1012         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
1013         if (sk == NULL)
1014                 return -ENOMEM;
1015 
1016         return 0;
1017 }
1018 
1019 static const struct nfc_protocol llcp_nfc_proto = {
1020         .id       = NFC_SOCKPROTO_LLCP,
1021         .proto    = &llcp_sock_proto,
1022         .owner    = THIS_MODULE,
1023         .create   = llcp_sock_create
1024 };
1025 
1026 int __init nfc_llcp_sock_init(void)
1027 {
1028         return nfc_proto_register(&llcp_nfc_proto);
1029 }
1030 
1031 void nfc_llcp_sock_exit(void)
1032 {
1033         nfc_proto_unregister(&llcp_nfc_proto);
1034 }
1035 

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