2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
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.
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.
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.
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/nfc.h>
30 static int sock_wait_state(struct sock
*sk
, int state
, unsigned long timeo
)
32 DECLARE_WAITQUEUE(wait
, current
);
35 pr_debug("sk %p", sk
);
37 add_wait_queue(sk_sleep(sk
), &wait
);
38 set_current_state(TASK_INTERRUPTIBLE
);
40 while (sk
->sk_state
!= state
) {
46 if (signal_pending(current
)) {
47 err
= sock_intr_errno(timeo
);
52 timeo
= schedule_timeout(timeo
);
54 set_current_state(TASK_INTERRUPTIBLE
);
61 __set_current_state(TASK_RUNNING
);
62 remove_wait_queue(sk_sleep(sk
), &wait
);
66 static struct proto llcp_sock_proto
= {
69 .obj_size
= sizeof(struct nfc_llcp_sock
),
72 static int llcp_sock_bind(struct socket
*sock
, struct sockaddr
*addr
, int alen
)
74 struct sock
*sk
= sock
->sk
;
75 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
76 struct nfc_llcp_local
*local
;
78 struct sockaddr_nfc_llcp llcp_addr
;
81 pr_debug("sk %p addr %p family %d\n", sk
, addr
, addr
->sa_family
);
83 if (!addr
|| addr
->sa_family
!= AF_NFC
)
86 memset(&llcp_addr
, 0, sizeof(llcp_addr
));
87 len
= min_t(unsigned int, sizeof(llcp_addr
), alen
);
88 memcpy(&llcp_addr
, addr
, len
);
90 /* This is going to be a listening socket, dsap must be 0 */
91 if (llcp_addr
.dsap
!= 0)
96 if (sk
->sk_state
!= LLCP_CLOSED
) {
101 dev
= nfc_get_device(llcp_addr
.dev_idx
);
107 local
= nfc_llcp_find_local(dev
);
113 llcp_sock
->dev
= dev
;
114 llcp_sock
->local
= 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
,
123 llcp_sock
->ssap
= nfc_llcp_get_sdp_ssap(local
, llcp_sock
);
124 if (llcp_sock
->ssap
== LLCP_MAX_SAP
)
127 local
->sockets
[llcp_sock
->ssap
] = llcp_sock
;
129 pr_debug("Socket bound to SAP %d\n", llcp_sock
->ssap
);
131 sk
->sk_state
= LLCP_BOUND
;
141 static int llcp_sock_listen(struct socket
*sock
, int backlog
)
143 struct sock
*sk
= sock
->sk
;
146 pr_debug("sk %p backlog %d\n", sk
, backlog
);
150 if ((sock
->type
!= SOCK_SEQPACKET
&& sock
->type
!= SOCK_STREAM
)
151 || sk
->sk_state
!= LLCP_BOUND
) {
156 sk
->sk_max_ack_backlog
= backlog
;
157 sk
->sk_ack_backlog
= 0;
159 pr_debug("Socket listening\n");
160 sk
->sk_state
= LLCP_LISTEN
;
168 void nfc_llcp_accept_unlink(struct sock
*sk
)
170 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
172 pr_debug("state %d\n", sk
->sk_state
);
174 list_del_init(&llcp_sock
->accept_queue
);
175 sk_acceptq_removed(llcp_sock
->parent
);
176 llcp_sock
->parent
= NULL
;
181 void nfc_llcp_accept_enqueue(struct sock
*parent
, struct sock
*sk
)
183 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
184 struct nfc_llcp_sock
*llcp_sock_parent
= nfc_llcp_sock(parent
);
186 /* Lock will be free from unlink */
189 list_add_tail(&llcp_sock
->accept_queue
,
190 &llcp_sock_parent
->accept_queue
);
191 llcp_sock
->parent
= parent
;
192 sk_acceptq_added(parent
);
195 struct sock
*nfc_llcp_accept_dequeue(struct sock
*parent
,
196 struct socket
*newsock
)
198 struct nfc_llcp_sock
*lsk
, *n
, *llcp_parent
;
201 llcp_parent
= nfc_llcp_sock(parent
);
203 list_for_each_entry_safe(lsk
, n
, &llcp_parent
->accept_queue
,
208 if (sk
->sk_state
== LLCP_CLOSED
) {
210 nfc_llcp_accept_unlink(sk
);
214 if (sk
->sk_state
== LLCP_CONNECTED
|| !newsock
) {
215 nfc_llcp_accept_unlink(sk
);
217 sock_graft(sk
, newsock
);
221 pr_debug("Returning sk state %d\n", sk
->sk_state
);
232 static int llcp_sock_accept(struct socket
*sock
, struct socket
*newsock
,
235 DECLARE_WAITQUEUE(wait
, current
);
236 struct sock
*sk
= sock
->sk
, *new_sk
;
240 pr_debug("parent %p\n", sk
);
242 lock_sock_nested(sk
, SINGLE_DEPTH_NESTING
);
244 if (sk
->sk_state
!= LLCP_LISTEN
) {
249 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
251 /* Wait for an incoming connection. */
252 add_wait_queue_exclusive(sk_sleep(sk
), &wait
);
253 while (!(new_sk
= nfc_llcp_accept_dequeue(sk
, newsock
))) {
254 set_current_state(TASK_INTERRUPTIBLE
);
261 if (signal_pending(current
)) {
262 ret
= sock_intr_errno(timeo
);
267 timeo
= schedule_timeout(timeo
);
268 lock_sock_nested(sk
, SINGLE_DEPTH_NESTING
);
270 __set_current_state(TASK_RUNNING
);
271 remove_wait_queue(sk_sleep(sk
), &wait
);
276 newsock
->state
= SS_CONNECTED
;
278 pr_debug("new socket %p\n", new_sk
);
286 static int llcp_sock_getname(struct socket
*sock
, struct sockaddr
*addr
,
289 struct sockaddr_nfc_llcp
*llcp_addr
= (struct sockaddr_nfc_llcp
*)addr
;
290 struct sock
*sk
= sock
->sk
;
291 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
293 pr_debug("%p\n", sk
);
295 if (llcp_sock
== NULL
)
298 addr
->sa_family
= AF_NFC
;
299 *len
= sizeof(struct sockaddr_nfc_llcp
);
301 llcp_addr
->dev_idx
= llcp_sock
->dev
->idx
;
302 llcp_addr
->dsap
= llcp_sock
->dsap
;
303 llcp_addr
->ssap
= llcp_sock
->ssap
;
304 llcp_addr
->service_name_len
= llcp_sock
->service_name_len
;
305 memcpy(llcp_addr
->service_name
, llcp_sock
->service_name
,
306 llcp_addr
->service_name_len
);
311 static inline unsigned int llcp_accept_poll(struct sock
*parent
)
313 struct nfc_llcp_sock
*llcp_sock
, *n
, *parent_sock
;
316 parent_sock
= nfc_llcp_sock(parent
);
318 list_for_each_entry_safe(llcp_sock
, n
, &parent_sock
->accept_queue
,
322 if (sk
->sk_state
== LLCP_CONNECTED
)
323 return POLLIN
| POLLRDNORM
;
329 static unsigned int llcp_sock_poll(struct file
*file
, struct socket
*sock
,
332 struct sock
*sk
= sock
->sk
;
333 unsigned int mask
= 0;
335 pr_debug("%p\n", sk
);
337 sock_poll_wait(file
, sk_sleep(sk
), wait
);
339 if (sk
->sk_state
== LLCP_LISTEN
)
340 return llcp_accept_poll(sk
);
342 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
345 if (!skb_queue_empty(&sk
->sk_receive_queue
))
346 mask
|= POLLIN
| POLLRDNORM
;
348 if (sk
->sk_state
== LLCP_CLOSED
)
351 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
352 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
354 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
357 if (sock_writeable(sk
))
358 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
360 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
362 pr_debug("mask 0x%x\n", mask
);
367 static int llcp_sock_release(struct socket
*sock
)
369 struct sock
*sk
= sock
->sk
;
370 struct nfc_llcp_local
*local
;
371 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
377 pr_debug("%p\n", sk
);
379 local
= llcp_sock
->local
;
385 mutex_lock(&local
->socket_lock
);
387 if (llcp_sock
== local
->sockets
[llcp_sock
->ssap
])
388 local
->sockets
[llcp_sock
->ssap
] = NULL
;
390 list_del_init(&llcp_sock
->list
);
392 mutex_unlock(&local
->socket_lock
);
397 if (sk
->sk_state
== LLCP_CONNECTED
)
398 nfc_llcp_disconnect(llcp_sock
);
400 if (sk
->sk_state
== LLCP_LISTEN
) {
401 struct nfc_llcp_sock
*lsk
, *n
;
402 struct sock
*accept_sk
;
404 list_for_each_entry_safe(lsk
, n
, &llcp_sock
->accept_queue
,
406 accept_sk
= &lsk
->sk
;
407 lock_sock(accept_sk
);
409 nfc_llcp_disconnect(lsk
);
410 nfc_llcp_accept_unlink(accept_sk
);
412 release_sock(accept_sk
);
414 sock_orphan(accept_sk
);
418 /* Freeing the SAP */
419 if ((sk
->sk_state
== LLCP_CONNECTED
420 && llcp_sock
->ssap
> LLCP_LOCAL_SAP_OFFSET
) ||
421 sk
->sk_state
== LLCP_BOUND
|| sk
->sk_state
== LLCP_LISTEN
)
422 nfc_llcp_put_ssap(llcp_sock
->local
, llcp_sock
->ssap
);
433 static int llcp_sock_connect(struct socket
*sock
, struct sockaddr
*_addr
,
436 struct sock
*sk
= sock
->sk
;
437 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
438 struct sockaddr_nfc_llcp
*addr
= (struct sockaddr_nfc_llcp
*)_addr
;
440 struct nfc_llcp_local
*local
;
443 pr_debug("sock %p sk %p flags 0x%x\n", sock
, sk
, flags
);
445 if (!addr
|| len
< sizeof(struct sockaddr_nfc
) ||
446 addr
->sa_family
!= AF_NFC
) {
447 pr_err("Invalid socket\n");
451 if (addr
->service_name_len
== 0 && addr
->dsap
== 0) {
452 pr_err("Missing service name or dsap\n");
456 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr
->dev_idx
,
457 addr
->target_idx
, addr
->nfc_protocol
);
461 if (sk
->sk_state
== LLCP_CONNECTED
) {
466 dev
= nfc_get_device(addr
->dev_idx
);
472 local
= nfc_llcp_find_local(dev
);
478 device_lock(&dev
->dev
);
479 if (dev
->dep_link_up
== false) {
481 device_unlock(&dev
->dev
);
484 device_unlock(&dev
->dev
);
486 if (local
->rf_mode
== NFC_RF_INITIATOR
&&
487 addr
->target_idx
!= local
->target_idx
) {
492 llcp_sock
->dev
= dev
;
493 llcp_sock
->local
= local
;
494 llcp_sock
->ssap
= nfc_llcp_get_local_ssap(local
);
495 if (llcp_sock
->ssap
== LLCP_SAP_MAX
) {
499 if (addr
->service_name_len
== 0)
500 llcp_sock
->dsap
= addr
->dsap
;
502 llcp_sock
->dsap
= LLCP_SAP_SDP
;
503 llcp_sock
->nfc_protocol
= addr
->nfc_protocol
;
504 llcp_sock
->service_name_len
= min_t(unsigned int,
505 addr
->service_name_len
,
506 NFC_LLCP_MAX_SERVICE_NAME
);
507 llcp_sock
->service_name
= kmemdup(addr
->service_name
,
508 llcp_sock
->service_name_len
,
511 local
->sockets
[llcp_sock
->ssap
] = llcp_sock
;
513 ret
= nfc_llcp_send_connect(llcp_sock
);
517 ret
= sock_wait_state(sk
, LLCP_CONNECTED
,
518 sock_sndtimeo(sk
, flags
& O_NONBLOCK
));
534 static int llcp_sock_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
535 struct msghdr
*msg
, size_t len
)
537 struct sock
*sk
= sock
->sk
;
538 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
541 pr_debug("sock %p sk %p", sock
, sk
);
543 ret
= sock_error(sk
);
547 if (msg
->msg_flags
& MSG_OOB
)
552 if (sk
->sk_state
!= LLCP_CONNECTED
) {
559 return nfc_llcp_send_i_frame(llcp_sock
, msg
, len
);
562 static int llcp_sock_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
563 struct msghdr
*msg
, size_t len
, int flags
)
565 int noblock
= flags
& MSG_DONTWAIT
;
566 struct sock
*sk
= sock
->sk
;
567 unsigned int copied
, rlen
;
568 struct sk_buff
*skb
, *cskb
;
571 pr_debug("%p %zu\n", sk
, len
);
575 if (sk
->sk_state
== LLCP_CLOSED
&&
576 skb_queue_empty(&sk
->sk_receive_queue
)) {
583 if (flags
& (MSG_OOB
))
586 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
588 pr_err("Recv datagram failed state %d %d %d",
589 sk
->sk_state
, err
, sock_error(sk
));
591 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
597 rlen
= skb
->len
; /* real length of skb */
598 copied
= min_t(unsigned int, rlen
, len
);
601 if (memcpy_toiovec(msg
->msg_iov
, cskb
->data
, copied
)) {
602 if (!(flags
& MSG_PEEK
))
603 skb_queue_head(&sk
->sk_receive_queue
, skb
);
607 /* Mark read part of skb as used */
608 if (!(flags
& MSG_PEEK
)) {
610 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
611 if (sk
->sk_type
== SOCK_STREAM
) {
612 skb_pull(skb
, copied
);
614 skb_queue_head(&sk
->sk_receive_queue
, skb
);
622 /* XXX Queue backlogged skbs */
625 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
626 if (sk
->sk_type
== SOCK_SEQPACKET
&& (flags
& MSG_TRUNC
))
632 static const struct proto_ops llcp_sock_ops
= {
634 .owner
= THIS_MODULE
,
635 .bind
= llcp_sock_bind
,
636 .connect
= llcp_sock_connect
,
637 .release
= llcp_sock_release
,
638 .socketpair
= sock_no_socketpair
,
639 .accept
= llcp_sock_accept
,
640 .getname
= llcp_sock_getname
,
641 .poll
= llcp_sock_poll
,
642 .ioctl
= sock_no_ioctl
,
643 .listen
= llcp_sock_listen
,
644 .shutdown
= sock_no_shutdown
,
645 .setsockopt
= sock_no_setsockopt
,
646 .getsockopt
= sock_no_getsockopt
,
647 .sendmsg
= llcp_sock_sendmsg
,
648 .recvmsg
= llcp_sock_recvmsg
,
649 .mmap
= sock_no_mmap
,
652 static void llcp_sock_destruct(struct sock
*sk
)
654 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
656 pr_debug("%p\n", sk
);
658 if (sk
->sk_state
== LLCP_CONNECTED
)
659 nfc_put_device(llcp_sock
->dev
);
661 skb_queue_purge(&sk
->sk_receive_queue
);
663 nfc_llcp_sock_free(llcp_sock
);
665 if (!sock_flag(sk
, SOCK_DEAD
)) {
666 pr_err("Freeing alive NFC LLCP socket %p\n", sk
);
671 struct sock
*nfc_llcp_sock_alloc(struct socket
*sock
, int type
, gfp_t gfp
)
674 struct nfc_llcp_sock
*llcp_sock
;
676 sk
= sk_alloc(&init_net
, PF_NFC
, gfp
, &llcp_sock_proto
);
680 llcp_sock
= nfc_llcp_sock(sk
);
682 sock_init_data(sock
, sk
);
683 sk
->sk_state
= LLCP_CLOSED
;
684 sk
->sk_protocol
= NFC_SOCKPROTO_LLCP
;
686 sk
->sk_destruct
= llcp_sock_destruct
;
689 llcp_sock
->dsap
= LLCP_SAP_SDP
;
690 llcp_sock
->send_n
= llcp_sock
->send_ack_n
= 0;
691 llcp_sock
->recv_n
= llcp_sock
->recv_ack_n
= 0;
692 llcp_sock
->remote_ready
= 1;
693 skb_queue_head_init(&llcp_sock
->tx_queue
);
694 skb_queue_head_init(&llcp_sock
->tx_pending_queue
);
695 skb_queue_head_init(&llcp_sock
->tx_backlog_queue
);
696 INIT_LIST_HEAD(&llcp_sock
->list
);
697 INIT_LIST_HEAD(&llcp_sock
->accept_queue
);
700 sock
->state
= SS_UNCONNECTED
;
705 void nfc_llcp_sock_free(struct nfc_llcp_sock
*sock
)
707 struct nfc_llcp_local
*local
= sock
->local
;
709 kfree(sock
->service_name
);
711 skb_queue_purge(&sock
->tx_queue
);
712 skb_queue_purge(&sock
->tx_pending_queue
);
713 skb_queue_purge(&sock
->tx_backlog_queue
);
715 list_del_init(&sock
->accept_queue
);
717 if (local
!= NULL
&& sock
== local
->sockets
[sock
->ssap
])
718 local
->sockets
[sock
->ssap
] = NULL
;
720 list_del_init(&sock
->list
);
725 static int llcp_sock_create(struct net
*net
, struct socket
*sock
,
726 const struct nfc_protocol
*nfc_proto
)
730 pr_debug("%p\n", sock
);
732 if (sock
->type
!= SOCK_STREAM
&& sock
->type
!= SOCK_DGRAM
)
733 return -ESOCKTNOSUPPORT
;
735 sock
->ops
= &llcp_sock_ops
;
737 sk
= nfc_llcp_sock_alloc(sock
, sock
->type
, GFP_ATOMIC
);
744 static const struct nfc_protocol llcp_nfc_proto
= {
745 .id
= NFC_SOCKPROTO_LLCP
,
746 .proto
= &llcp_sock_proto
,
747 .owner
= THIS_MODULE
,
748 .create
= llcp_sock_create
751 int __init
nfc_llcp_sock_init(void)
753 return nfc_proto_register(&llcp_nfc_proto
);
756 void nfc_llcp_sock_exit(void)
758 nfc_proto_unregister(&llcp_nfc_proto
);