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TOMOYO Linux Cross Reference
Linux/net/nfc/llcp_sock.c

Version: ~ [ linux-5.5 ] ~ [ linux-5.4.15 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.98 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.167 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.211 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.211 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/sched/signal.h>
 25 
 26 #include "nfc.h"
 27 #include "llcp.h"
 28 
 29 static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
 30 {
 31         DECLARE_WAITQUEUE(wait, current);
 32         int err = 0;
 33 
 34         pr_debug("sk %p", sk);
 35 
 36         add_wait_queue(sk_sleep(sk), &wait);
 37         set_current_state(TASK_INTERRUPTIBLE);
 38 
 39         while (sk->sk_state != state) {
 40                 if (!timeo) {
 41                         err = -EINPROGRESS;
 42                         break;
 43                 }
 44 
 45                 if (signal_pending(current)) {
 46                         err = sock_intr_errno(timeo);
 47                         break;
 48                 }
 49 
 50                 release_sock(sk);
 51                 timeo = schedule_timeout(timeo);
 52                 lock_sock(sk);
 53                 set_current_state(TASK_INTERRUPTIBLE);
 54 
 55                 err = sock_error(sk);
 56                 if (err)
 57                         break;
 58         }
 59 
 60         __set_current_state(TASK_RUNNING);
 61         remove_wait_queue(sk_sleep(sk), &wait);
 62         return err;
 63 }
 64 
 65 static struct proto llcp_sock_proto = {
 66         .name     = "NFC_LLCP",
 67         .owner    = THIS_MODULE,
 68         .obj_size = sizeof(struct nfc_llcp_sock),
 69 };
 70 
 71 static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 72 {
 73         struct sock *sk = sock->sk;
 74         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 75         struct nfc_llcp_local *local;
 76         struct nfc_dev *dev;
 77         struct sockaddr_nfc_llcp llcp_addr;
 78         int len, ret = 0;
 79 
 80         if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
 81             addr->sa_family != AF_NFC)
 82                 return -EINVAL;
 83 
 84         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
 85 
 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;
114         llcp_sock->local = nfc_llcp_local_get(local);
115         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
116         llcp_sock->service_name_len = min_t(unsigned int,
117                                             llcp_addr.service_name_len,
118                                             NFC_LLCP_MAX_SERVICE_NAME);
119         llcp_sock->service_name = kmemdup(llcp_addr.service_name,
120                                           llcp_sock->service_name_len,
121                                           GFP_KERNEL);
122 
123         llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
124         if (llcp_sock->ssap == LLCP_SAP_MAX) {
125                 ret = -EADDRINUSE;
126                 goto put_dev;
127         }
128 
129         llcp_sock->reserved_ssap = llcp_sock->ssap;
130 
131         nfc_llcp_sock_link(&local->sockets, sk);
132 
133         pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
134 
135         sk->sk_state = LLCP_BOUND;
136 
137 put_dev:
138         nfc_put_device(dev);
139 
140 error:
141         release_sock(sk);
142         return ret;
143 }
144 
145 static 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 || alen < offsetofend(struct sockaddr, sa_family) ||
156             addr->sa_family != AF_NFC)
157                 return -EINVAL;
158 
159         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
160 
161         memset(&llcp_addr, 0, sizeof(llcp_addr));
162         len = min_t(unsigned int, sizeof(llcp_addr), alen);
163         memcpy(&llcp_addr, addr, len);
164 
165         lock_sock(sk);
166 
167         if (sk->sk_state != LLCP_CLOSED) {
168                 ret = -EBADFD;
169                 goto error;
170         }
171 
172         dev = nfc_get_device(llcp_addr.dev_idx);
173         if (dev == NULL) {
174                 ret = -ENODEV;
175                 goto error;
176         }
177 
178         local = nfc_llcp_find_local(dev);
179         if (local == NULL) {
180                 ret = -ENODEV;
181                 goto put_dev;
182         }
183 
184         llcp_sock->dev = dev;
185         llcp_sock->local = nfc_llcp_local_get(local);
186         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
187 
188         nfc_llcp_sock_link(&local->raw_sockets, sk);
189 
190         sk->sk_state = LLCP_BOUND;
191 
192 put_dev:
193         nfc_put_device(dev);
194 
195 error:
196         release_sock(sk);
197         return ret;
198 }
199 
200 static int llcp_sock_listen(struct socket *sock, int backlog)
201 {
202         struct sock *sk = sock->sk;
203         int ret = 0;
204 
205         pr_debug("sk %p backlog %d\n", sk, backlog);
206 
207         lock_sock(sk);
208 
209         if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
210             sk->sk_state != LLCP_BOUND) {
211                 ret = -EBADFD;
212                 goto error;
213         }
214 
215         sk->sk_max_ack_backlog = backlog;
216         sk->sk_ack_backlog = 0;
217 
218         pr_debug("Socket listening\n");
219         sk->sk_state = LLCP_LISTEN;
220 
221 error:
222         release_sock(sk);
223 
224         return ret;
225 }
226 
227 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
228                                char __user *optval, unsigned int optlen)
229 {
230         struct sock *sk = sock->sk;
231         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
232         u32 opt;
233         int err = 0;
234 
235         pr_debug("%p optname %d\n", sk, optname);
236 
237         if (level != SOL_NFC)
238                 return -ENOPROTOOPT;
239 
240         lock_sock(sk);
241 
242         switch (optname) {
243         case NFC_LLCP_RW:
244                 if (sk->sk_state == LLCP_CONNECTED ||
245                     sk->sk_state == LLCP_BOUND ||
246                     sk->sk_state == LLCP_LISTEN) {
247                         err = -EINVAL;
248                         break;
249                 }
250 
251                 if (get_user(opt, (u32 __user *) optval)) {
252                         err = -EFAULT;
253                         break;
254                 }
255 
256                 if (opt > LLCP_MAX_RW) {
257                         err = -EINVAL;
258                         break;
259                 }
260 
261                 llcp_sock->rw = (u8) opt;
262 
263                 break;
264 
265         case NFC_LLCP_MIUX:
266                 if (sk->sk_state == LLCP_CONNECTED ||
267                     sk->sk_state == LLCP_BOUND ||
268                     sk->sk_state == LLCP_LISTEN) {
269                         err = -EINVAL;
270                         break;
271                 }
272 
273                 if (get_user(opt, (u32 __user *) optval)) {
274                         err = -EFAULT;
275                         break;
276                 }
277 
278                 if (opt > LLCP_MAX_MIUX) {
279                         err = -EINVAL;
280                         break;
281                 }
282 
283                 llcp_sock->miux = cpu_to_be16((u16) opt);
284 
285                 break;
286 
287         default:
288                 err = -ENOPROTOOPT;
289                 break;
290         }
291 
292         release_sock(sk);
293 
294         pr_debug("%p rw %d miux %d\n", llcp_sock,
295                  llcp_sock->rw, llcp_sock->miux);
296 
297         return err;
298 }
299 
300 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
301                                char __user *optval, int __user *optlen)
302 {
303         struct nfc_llcp_local *local;
304         struct sock *sk = sock->sk;
305         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
306         int len, err = 0;
307         u16 miux, remote_miu;
308         u8 rw;
309 
310         pr_debug("%p optname %d\n", sk, optname);
311 
312         if (level != SOL_NFC)
313                 return -ENOPROTOOPT;
314 
315         if (get_user(len, optlen))
316                 return -EFAULT;
317 
318         local = llcp_sock->local;
319         if (!local)
320                 return -ENODEV;
321 
322         len = min_t(u32, len, sizeof(u32));
323 
324         lock_sock(sk);
325 
326         switch (optname) {
327         case NFC_LLCP_RW:
328                 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
329                 if (put_user(rw, (u32 __user *) optval))
330                         err = -EFAULT;
331 
332                 break;
333 
334         case NFC_LLCP_MIUX:
335                 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
336                         be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
337 
338                 if (put_user(miux, (u32 __user *) optval))
339                         err = -EFAULT;
340 
341                 break;
342 
343         case NFC_LLCP_REMOTE_MIU:
344                 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
345                                 local->remote_miu : llcp_sock->remote_miu;
346 
347                 if (put_user(remote_miu, (u32 __user *) optval))
348                         err = -EFAULT;
349 
350                 break;
351 
352         case NFC_LLCP_REMOTE_LTO:
353                 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
354                         err = -EFAULT;
355 
356                 break;
357 
358         case NFC_LLCP_REMOTE_RW:
359                 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
360                         err = -EFAULT;
361 
362                 break;
363 
364         default:
365                 err = -ENOPROTOOPT;
366                 break;
367         }
368 
369         release_sock(sk);
370 
371         if (put_user(len, optlen))
372                 return -EFAULT;
373 
374         return err;
375 }
376 
377 void nfc_llcp_accept_unlink(struct sock *sk)
378 {
379         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
380 
381         pr_debug("state %d\n", sk->sk_state);
382 
383         list_del_init(&llcp_sock->accept_queue);
384         sk_acceptq_removed(llcp_sock->parent);
385         llcp_sock->parent = NULL;
386 
387         sock_put(sk);
388 }
389 
390 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
391 {
392         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
393         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
394 
395         /* Lock will be free from unlink */
396         sock_hold(sk);
397 
398         list_add_tail(&llcp_sock->accept_queue,
399                       &llcp_sock_parent->accept_queue);
400         llcp_sock->parent = parent;
401         sk_acceptq_added(parent);
402 }
403 
404 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
405                                      struct socket *newsock)
406 {
407         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
408         struct sock *sk;
409 
410         llcp_parent = nfc_llcp_sock(parent);
411 
412         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
413                                  accept_queue) {
414                 sk = &lsk->sk;
415                 lock_sock(sk);
416 
417                 if (sk->sk_state == LLCP_CLOSED) {
418                         release_sock(sk);
419                         nfc_llcp_accept_unlink(sk);
420                         continue;
421                 }
422 
423                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
424                         list_del_init(&lsk->accept_queue);
425                         sock_put(sk);
426 
427                         if (newsock)
428                                 sock_graft(sk, newsock);
429 
430                         release_sock(sk);
431 
432                         pr_debug("Returning sk state %d\n", sk->sk_state);
433 
434                         sk_acceptq_removed(parent);
435 
436                         return sk;
437                 }
438 
439                 release_sock(sk);
440         }
441 
442         return NULL;
443 }
444 
445 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
446                             int flags, bool kern)
447 {
448         DECLARE_WAITQUEUE(wait, current);
449         struct sock *sk = sock->sk, *new_sk;
450         long timeo;
451         int ret = 0;
452 
453         pr_debug("parent %p\n", sk);
454 
455         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
456 
457         if (sk->sk_state != LLCP_LISTEN) {
458                 ret = -EBADFD;
459                 goto error;
460         }
461 
462         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
463 
464         /* Wait for an incoming connection. */
465         add_wait_queue_exclusive(sk_sleep(sk), &wait);
466         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
467                 set_current_state(TASK_INTERRUPTIBLE);
468 
469                 if (!timeo) {
470                         ret = -EAGAIN;
471                         break;
472                 }
473 
474                 if (signal_pending(current)) {
475                         ret = sock_intr_errno(timeo);
476                         break;
477                 }
478 
479                 release_sock(sk);
480                 timeo = schedule_timeout(timeo);
481                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
482         }
483         __set_current_state(TASK_RUNNING);
484         remove_wait_queue(sk_sleep(sk), &wait);
485 
486         if (ret)
487                 goto error;
488 
489         newsock->state = SS_CONNECTED;
490 
491         pr_debug("new socket %p\n", new_sk);
492 
493 error:
494         release_sock(sk);
495 
496         return ret;
497 }
498 
499 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
500                              int peer)
501 {
502         struct sock *sk = sock->sk;
503         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
504         DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
505 
506         if (llcp_sock == NULL || llcp_sock->dev == NULL)
507                 return -EBADFD;
508 
509         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
510                  llcp_sock->dsap, llcp_sock->ssap);
511 
512         memset(llcp_addr, 0, sizeof(*llcp_addr));
513 
514         lock_sock(sk);
515         if (!llcp_sock->dev) {
516                 release_sock(sk);
517                 return -EBADFD;
518         }
519         llcp_addr->sa_family = AF_NFC;
520         llcp_addr->dev_idx = llcp_sock->dev->idx;
521         llcp_addr->target_idx = llcp_sock->target_idx;
522         llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
523         llcp_addr->dsap = llcp_sock->dsap;
524         llcp_addr->ssap = llcp_sock->ssap;
525         llcp_addr->service_name_len = llcp_sock->service_name_len;
526         memcpy(llcp_addr->service_name, llcp_sock->service_name,
527                llcp_addr->service_name_len);
528         release_sock(sk);
529 
530         return sizeof(struct sockaddr_nfc_llcp);
531 }
532 
533 static inline __poll_t llcp_accept_poll(struct sock *parent)
534 {
535         struct nfc_llcp_sock *llcp_sock, *parent_sock;
536         struct sock *sk;
537 
538         parent_sock = nfc_llcp_sock(parent);
539 
540         list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
541                             accept_queue) {
542                 sk = &llcp_sock->sk;
543 
544                 if (sk->sk_state == LLCP_CONNECTED)
545                         return EPOLLIN | EPOLLRDNORM;
546         }
547 
548         return 0;
549 }
550 
551 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
552                                    poll_table *wait)
553 {
554         struct sock *sk = sock->sk;
555         __poll_t mask = 0;
556 
557         pr_debug("%p\n", sk);
558 
559         sock_poll_wait(file, sock, wait);
560 
561         if (sk->sk_state == LLCP_LISTEN)
562                 return llcp_accept_poll(sk);
563 
564         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
565                 mask |= EPOLLERR |
566                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
567 
568         if (!skb_queue_empty(&sk->sk_receive_queue))
569                 mask |= EPOLLIN | EPOLLRDNORM;
570 
571         if (sk->sk_state == LLCP_CLOSED)
572                 mask |= EPOLLHUP;
573 
574         if (sk->sk_shutdown & RCV_SHUTDOWN)
575                 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
576 
577         if (sk->sk_shutdown == SHUTDOWN_MASK)
578                 mask |= EPOLLHUP;
579 
580         if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
581                 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
582         else
583                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
584 
585         pr_debug("mask 0x%x\n", mask);
586 
587         return mask;
588 }
589 
590 static int llcp_sock_release(struct socket *sock)
591 {
592         struct sock *sk = sock->sk;
593         struct nfc_llcp_local *local;
594         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
595         int err = 0;
596 
597         if (!sk)
598                 return 0;
599 
600         pr_debug("%p\n", sk);
601 
602         local = llcp_sock->local;
603         if (local == NULL) {
604                 err = -ENODEV;
605                 goto out;
606         }
607 
608         lock_sock(sk);
609 
610         /* Send a DISC */
611         if (sk->sk_state == LLCP_CONNECTED)
612                 nfc_llcp_send_disconnect(llcp_sock);
613 
614         if (sk->sk_state == LLCP_LISTEN) {
615                 struct nfc_llcp_sock *lsk, *n;
616                 struct sock *accept_sk;
617 
618                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
619                                          accept_queue) {
620                         accept_sk = &lsk->sk;
621                         lock_sock(accept_sk);
622 
623                         nfc_llcp_send_disconnect(lsk);
624                         nfc_llcp_accept_unlink(accept_sk);
625 
626                         release_sock(accept_sk);
627                 }
628         }
629 
630         if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
631                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
632 
633         release_sock(sk);
634 
635         /* Keep this sock alive and therefore do not remove it from the sockets
636          * list until the DISC PDU has been actually sent. Otherwise we would
637          * reply with DM PDUs before sending the DISC one.
638          */
639         if (sk->sk_state == LLCP_DISCONNECTING)
640                 return err;
641 
642         if (sock->type == SOCK_RAW)
643                 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
644         else
645                 nfc_llcp_sock_unlink(&local->sockets, sk);
646 
647 out:
648         sock_orphan(sk);
649         sock_put(sk);
650 
651         return err;
652 }
653 
654 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
655                              int len, int flags)
656 {
657         struct sock *sk = sock->sk;
658         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
659         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
660         struct nfc_dev *dev;
661         struct nfc_llcp_local *local;
662         int ret = 0;
663 
664         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
665 
666         if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
667                 return -EINVAL;
668 
669         if (addr->service_name_len == 0 && addr->dsap == 0)
670                 return -EINVAL;
671 
672         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
673                  addr->target_idx, addr->nfc_protocol);
674 
675         lock_sock(sk);
676 
677         if (sk->sk_state == LLCP_CONNECTED) {
678                 ret = -EISCONN;
679                 goto error;
680         }
681 
682         dev = nfc_get_device(addr->dev_idx);
683         if (dev == NULL) {
684                 ret = -ENODEV;
685                 goto error;
686         }
687 
688         local = nfc_llcp_find_local(dev);
689         if (local == NULL) {
690                 ret = -ENODEV;
691                 goto put_dev;
692         }
693 
694         device_lock(&dev->dev);
695         if (dev->dep_link_up == false) {
696                 ret = -ENOLINK;
697                 device_unlock(&dev->dev);
698                 goto put_dev;
699         }
700         device_unlock(&dev->dev);
701 
702         if (local->rf_mode == NFC_RF_INITIATOR &&
703             addr->target_idx != local->target_idx) {
704                 ret = -ENOLINK;
705                 goto put_dev;
706         }
707 
708         llcp_sock->dev = dev;
709         llcp_sock->local = nfc_llcp_local_get(local);
710         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
711         if (llcp_sock->ssap == LLCP_SAP_MAX) {
712                 ret = -ENOMEM;
713                 goto put_dev;
714         }
715 
716         llcp_sock->reserved_ssap = llcp_sock->ssap;
717 
718         if (addr->service_name_len == 0)
719                 llcp_sock->dsap = addr->dsap;
720         else
721                 llcp_sock->dsap = LLCP_SAP_SDP;
722         llcp_sock->nfc_protocol = addr->nfc_protocol;
723         llcp_sock->service_name_len = min_t(unsigned int,
724                                             addr->service_name_len,
725                                             NFC_LLCP_MAX_SERVICE_NAME);
726         llcp_sock->service_name = kmemdup(addr->service_name,
727                                           llcp_sock->service_name_len,
728                                           GFP_KERNEL);
729 
730         nfc_llcp_sock_link(&local->connecting_sockets, sk);
731 
732         ret = nfc_llcp_send_connect(llcp_sock);
733         if (ret)
734                 goto sock_unlink;
735 
736         sk->sk_state = LLCP_CONNECTING;
737 
738         ret = sock_wait_state(sk, LLCP_CONNECTED,
739                               sock_sndtimeo(sk, flags & O_NONBLOCK));
740         if (ret && ret != -EINPROGRESS)
741                 goto sock_unlink;
742 
743         release_sock(sk);
744 
745         return ret;
746 
747 sock_unlink:
748         nfc_llcp_put_ssap(local, llcp_sock->ssap);
749 
750         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
751 
752 put_dev:
753         nfc_put_device(dev);
754 
755 error:
756         release_sock(sk);
757         return ret;
758 }
759 
760 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
761                              size_t len)
762 {
763         struct sock *sk = sock->sk;
764         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
765         int ret;
766 
767         pr_debug("sock %p sk %p", sock, sk);
768 
769         ret = sock_error(sk);
770         if (ret)
771                 return ret;
772 
773         if (msg->msg_flags & MSG_OOB)
774                 return -EOPNOTSUPP;
775 
776         lock_sock(sk);
777 
778         if (sk->sk_type == SOCK_DGRAM) {
779                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
780                                  msg->msg_name);
781 
782                 if (msg->msg_namelen < sizeof(*addr)) {
783                         release_sock(sk);
784                         return -EINVAL;
785                 }
786 
787                 release_sock(sk);
788 
789                 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
790                                               msg, len);
791         }
792 
793         if (sk->sk_state != LLCP_CONNECTED) {
794                 release_sock(sk);
795                 return -ENOTCONN;
796         }
797 
798         release_sock(sk);
799 
800         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
801 }
802 
803 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
804                              size_t len, int flags)
805 {
806         int noblock = flags & MSG_DONTWAIT;
807         struct sock *sk = sock->sk;
808         unsigned int copied, rlen;
809         struct sk_buff *skb, *cskb;
810         int err = 0;
811 
812         pr_debug("%p %zu\n", sk, len);
813 
814         lock_sock(sk);
815 
816         if (sk->sk_state == LLCP_CLOSED &&
817             skb_queue_empty(&sk->sk_receive_queue)) {
818                 release_sock(sk);
819                 return 0;
820         }
821 
822         release_sock(sk);
823 
824         if (flags & (MSG_OOB))
825                 return -EOPNOTSUPP;
826 
827         skb = skb_recv_datagram(sk, flags, noblock, &err);
828         if (!skb) {
829                 pr_err("Recv datagram failed state %d %d %d",
830                        sk->sk_state, err, sock_error(sk));
831 
832                 if (sk->sk_shutdown & RCV_SHUTDOWN)
833                         return 0;
834 
835                 return err;
836         }
837 
838         rlen = skb->len;                /* real length of skb */
839         copied = min_t(unsigned int, rlen, len);
840 
841         cskb = skb;
842         if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
843                 if (!(flags & MSG_PEEK))
844                         skb_queue_head(&sk->sk_receive_queue, skb);
845                 return -EFAULT;
846         }
847 
848         sock_recv_timestamp(msg, sk, skb);
849 
850         if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
851                 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
852                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
853                                  msg->msg_name);
854 
855                 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
856 
857                 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
858 
859                 memset(sockaddr, 0, sizeof(*sockaddr));
860                 sockaddr->sa_family = AF_NFC;
861                 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
862                 sockaddr->dsap = ui_cb->dsap;
863                 sockaddr->ssap = ui_cb->ssap;
864         }
865 
866         /* Mark read part of skb as used */
867         if (!(flags & MSG_PEEK)) {
868 
869                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
870                 if (sk->sk_type == SOCK_STREAM ||
871                     sk->sk_type == SOCK_DGRAM ||
872                     sk->sk_type == SOCK_RAW) {
873                         skb_pull(skb, copied);
874                         if (skb->len) {
875                                 skb_queue_head(&sk->sk_receive_queue, skb);
876                                 goto done;
877                         }
878                 }
879 
880                 kfree_skb(skb);
881         }
882 
883         /* XXX Queue backlogged skbs */
884 
885 done:
886         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
887         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
888                 copied = rlen;
889 
890         return copied;
891 }
892 
893 static const struct proto_ops llcp_sock_ops = {
894         .family         = PF_NFC,
895         .owner          = THIS_MODULE,
896         .bind           = llcp_sock_bind,
897         .connect        = llcp_sock_connect,
898         .release        = llcp_sock_release,
899         .socketpair     = sock_no_socketpair,
900         .accept         = llcp_sock_accept,
901         .getname        = llcp_sock_getname,
902         .poll           = llcp_sock_poll,
903         .ioctl          = sock_no_ioctl,
904         .listen         = llcp_sock_listen,
905         .shutdown       = sock_no_shutdown,
906         .setsockopt     = nfc_llcp_setsockopt,
907         .getsockopt     = nfc_llcp_getsockopt,
908         .sendmsg        = llcp_sock_sendmsg,
909         .recvmsg        = llcp_sock_recvmsg,
910         .mmap           = sock_no_mmap,
911 };
912 
913 static const struct proto_ops llcp_rawsock_ops = {
914         .family         = PF_NFC,
915         .owner          = THIS_MODULE,
916         .bind           = llcp_raw_sock_bind,
917         .connect        = sock_no_connect,
918         .release        = llcp_sock_release,
919         .socketpair     = sock_no_socketpair,
920         .accept         = sock_no_accept,
921         .getname        = llcp_sock_getname,
922         .poll           = llcp_sock_poll,
923         .ioctl          = sock_no_ioctl,
924         .listen         = sock_no_listen,
925         .shutdown       = sock_no_shutdown,
926         .setsockopt     = sock_no_setsockopt,
927         .getsockopt     = sock_no_getsockopt,
928         .sendmsg        = sock_no_sendmsg,
929         .recvmsg        = llcp_sock_recvmsg,
930         .mmap           = sock_no_mmap,
931 };
932 
933 static void llcp_sock_destruct(struct sock *sk)
934 {
935         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
936 
937         pr_debug("%p\n", sk);
938 
939         if (sk->sk_state == LLCP_CONNECTED)
940                 nfc_put_device(llcp_sock->dev);
941 
942         skb_queue_purge(&sk->sk_receive_queue);
943 
944         nfc_llcp_sock_free(llcp_sock);
945 
946         if (!sock_flag(sk, SOCK_DEAD)) {
947                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
948                 return;
949         }
950 }
951 
952 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
953 {
954         struct sock *sk;
955         struct nfc_llcp_sock *llcp_sock;
956 
957         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
958         if (!sk)
959                 return NULL;
960 
961         llcp_sock = nfc_llcp_sock(sk);
962 
963         sock_init_data(sock, sk);
964         sk->sk_state = LLCP_CLOSED;
965         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
966         sk->sk_type = type;
967         sk->sk_destruct = llcp_sock_destruct;
968 
969         llcp_sock->ssap = 0;
970         llcp_sock->dsap = LLCP_SAP_SDP;
971         llcp_sock->rw = LLCP_MAX_RW + 1;
972         llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
973         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
974         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
975         llcp_sock->remote_ready = 1;
976         llcp_sock->reserved_ssap = LLCP_SAP_MAX;
977         nfc_llcp_socket_remote_param_init(llcp_sock);
978         skb_queue_head_init(&llcp_sock->tx_queue);
979         skb_queue_head_init(&llcp_sock->tx_pending_queue);
980         INIT_LIST_HEAD(&llcp_sock->accept_queue);
981 
982         if (sock != NULL)
983                 sock->state = SS_UNCONNECTED;
984 
985         return sk;
986 }
987 
988 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
989 {
990         kfree(sock->service_name);
991 
992         skb_queue_purge(&sock->tx_queue);
993         skb_queue_purge(&sock->tx_pending_queue);
994 
995         list_del_init(&sock->accept_queue);
996 
997         sock->parent = NULL;
998 
999         nfc_llcp_local_put(sock->local);
1000 }
1001 
1002 static int llcp_sock_create(struct net *net, struct socket *sock,
1003                             const struct nfc_protocol *nfc_proto, int kern)
1004 {
1005         struct sock *sk;
1006 
1007         pr_debug("%p\n", sock);
1008 
1009         if (sock->type != SOCK_STREAM &&
1010             sock->type != SOCK_DGRAM &&
1011             sock->type != SOCK_RAW)
1012                 return -ESOCKTNOSUPPORT;
1013 
1014         if (sock->type == SOCK_RAW)
1015                 sock->ops = &llcp_rawsock_ops;
1016         else
1017                 sock->ops = &llcp_sock_ops;
1018 
1019         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1020         if (sk == NULL)
1021                 return -ENOMEM;
1022 
1023         return 0;
1024 }
1025 
1026 static const struct nfc_protocol llcp_nfc_proto = {
1027         .id       = NFC_SOCKPROTO_LLCP,
1028         .proto    = &llcp_sock_proto,
1029         .owner    = THIS_MODULE,
1030         .create   = llcp_sock_create
1031 };
1032 
1033 int __init nfc_llcp_sock_init(void)
1034 {
1035         return nfc_proto_register(&llcp_nfc_proto);
1036 }
1037 
1038 void nfc_llcp_sock_exit(void)
1039 {
1040         nfc_proto_unregister(&llcp_nfc_proto);
1041 }
1042 

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