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
= 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
,
123 llcp_sock
->ssap
= nfc_llcp_get_sdp_ssap(local
, llcp_sock
);
124 if (llcp_sock
->ssap
== LLCP_MAX_SAP
)
127 nfc_llcp_sock_link(&local
->sockets
, sk
);
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
|| llcp_sock
->dev
== 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
;
388 if (sk
->sk_state
== LLCP_CONNECTED
)
389 nfc_llcp_disconnect(llcp_sock
);
391 if (sk
->sk_state
== LLCP_LISTEN
) {
392 struct nfc_llcp_sock
*lsk
, *n
;
393 struct sock
*accept_sk
;
395 list_for_each_entry_safe(lsk
, n
, &llcp_sock
->accept_queue
,
397 accept_sk
= &lsk
->sk
;
398 lock_sock(accept_sk
);
400 nfc_llcp_disconnect(lsk
);
401 nfc_llcp_accept_unlink(accept_sk
);
403 release_sock(accept_sk
);
405 sock_orphan(accept_sk
);
409 nfc_llcp_put_ssap(llcp_sock
->local
, llcp_sock
->ssap
);
413 nfc_llcp_sock_unlink(&local
->sockets
, sk
);
422 static int llcp_sock_connect(struct socket
*sock
, struct sockaddr
*_addr
,
425 struct sock
*sk
= sock
->sk
;
426 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
427 struct sockaddr_nfc_llcp
*addr
= (struct sockaddr_nfc_llcp
*)_addr
;
429 struct nfc_llcp_local
*local
;
432 pr_debug("sock %p sk %p flags 0x%x\n", sock
, sk
, flags
);
434 if (!addr
|| len
< sizeof(struct sockaddr_nfc
) ||
435 addr
->sa_family
!= AF_NFC
) {
436 pr_err("Invalid socket\n");
440 if (addr
->service_name_len
== 0 && addr
->dsap
== 0) {
441 pr_err("Missing service name or dsap\n");
445 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr
->dev_idx
,
446 addr
->target_idx
, addr
->nfc_protocol
);
450 if (sk
->sk_state
== LLCP_CONNECTED
) {
455 dev
= nfc_get_device(addr
->dev_idx
);
461 local
= nfc_llcp_find_local(dev
);
467 device_lock(&dev
->dev
);
468 if (dev
->dep_link_up
== false) {
470 device_unlock(&dev
->dev
);
473 device_unlock(&dev
->dev
);
475 if (local
->rf_mode
== NFC_RF_INITIATOR
&&
476 addr
->target_idx
!= local
->target_idx
) {
481 llcp_sock
->dev
= dev
;
482 llcp_sock
->local
= nfc_llcp_local_get(local
);
483 llcp_sock
->miu
= llcp_sock
->local
->remote_miu
;
484 llcp_sock
->ssap
= nfc_llcp_get_local_ssap(local
);
485 if (llcp_sock
->ssap
== LLCP_SAP_MAX
) {
489 if (addr
->service_name_len
== 0)
490 llcp_sock
->dsap
= addr
->dsap
;
492 llcp_sock
->dsap
= LLCP_SAP_SDP
;
493 llcp_sock
->nfc_protocol
= addr
->nfc_protocol
;
494 llcp_sock
->service_name_len
= min_t(unsigned int,
495 addr
->service_name_len
,
496 NFC_LLCP_MAX_SERVICE_NAME
);
497 llcp_sock
->service_name
= kmemdup(addr
->service_name
,
498 llcp_sock
->service_name_len
,
501 nfc_llcp_sock_link(&local
->connecting_sockets
, sk
);
503 ret
= nfc_llcp_send_connect(llcp_sock
);
507 ret
= sock_wait_state(sk
, LLCP_CONNECTED
,
508 sock_sndtimeo(sk
, flags
& O_NONBLOCK
));
517 nfc_llcp_put_ssap(local
, llcp_sock
->ssap
);
519 nfc_llcp_sock_unlink(&local
->connecting_sockets
, sk
);
529 static int llcp_sock_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
530 struct msghdr
*msg
, size_t len
)
532 struct sock
*sk
= sock
->sk
;
533 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
536 pr_debug("sock %p sk %p", sock
, sk
);
538 ret
= sock_error(sk
);
542 if (msg
->msg_flags
& MSG_OOB
)
547 if (sk
->sk_state
!= LLCP_CONNECTED
) {
554 return nfc_llcp_send_i_frame(llcp_sock
, msg
, len
);
557 static int llcp_sock_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
558 struct msghdr
*msg
, size_t len
, int flags
)
560 int noblock
= flags
& MSG_DONTWAIT
;
561 struct sock
*sk
= sock
->sk
;
562 unsigned int copied
, rlen
;
563 struct sk_buff
*skb
, *cskb
;
566 pr_debug("%p %zu\n", sk
, len
);
570 if (sk
->sk_state
== LLCP_CLOSED
&&
571 skb_queue_empty(&sk
->sk_receive_queue
)) {
578 if (flags
& (MSG_OOB
))
581 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
583 pr_err("Recv datagram failed state %d %d %d",
584 sk
->sk_state
, err
, sock_error(sk
));
586 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
592 rlen
= skb
->len
; /* real length of skb */
593 copied
= min_t(unsigned int, rlen
, len
);
596 if (memcpy_toiovec(msg
->msg_iov
, cskb
->data
, copied
)) {
597 if (!(flags
& MSG_PEEK
))
598 skb_queue_head(&sk
->sk_receive_queue
, skb
);
602 /* Mark read part of skb as used */
603 if (!(flags
& MSG_PEEK
)) {
605 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
606 if (sk
->sk_type
== SOCK_STREAM
) {
607 skb_pull(skb
, copied
);
609 skb_queue_head(&sk
->sk_receive_queue
, skb
);
617 /* XXX Queue backlogged skbs */
620 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
621 if (sk
->sk_type
== SOCK_SEQPACKET
&& (flags
& MSG_TRUNC
))
627 static const struct proto_ops llcp_sock_ops
= {
629 .owner
= THIS_MODULE
,
630 .bind
= llcp_sock_bind
,
631 .connect
= llcp_sock_connect
,
632 .release
= llcp_sock_release
,
633 .socketpair
= sock_no_socketpair
,
634 .accept
= llcp_sock_accept
,
635 .getname
= llcp_sock_getname
,
636 .poll
= llcp_sock_poll
,
637 .ioctl
= sock_no_ioctl
,
638 .listen
= llcp_sock_listen
,
639 .shutdown
= sock_no_shutdown
,
640 .setsockopt
= sock_no_setsockopt
,
641 .getsockopt
= sock_no_getsockopt
,
642 .sendmsg
= llcp_sock_sendmsg
,
643 .recvmsg
= llcp_sock_recvmsg
,
644 .mmap
= sock_no_mmap
,
647 static void llcp_sock_destruct(struct sock
*sk
)
649 struct nfc_llcp_sock
*llcp_sock
= nfc_llcp_sock(sk
);
651 pr_debug("%p\n", sk
);
653 if (sk
->sk_state
== LLCP_CONNECTED
)
654 nfc_put_device(llcp_sock
->dev
);
656 skb_queue_purge(&sk
->sk_receive_queue
);
658 nfc_llcp_sock_free(llcp_sock
);
660 if (!sock_flag(sk
, SOCK_DEAD
)) {
661 pr_err("Freeing alive NFC LLCP socket %p\n", sk
);
666 struct sock
*nfc_llcp_sock_alloc(struct socket
*sock
, int type
, gfp_t gfp
)
669 struct nfc_llcp_sock
*llcp_sock
;
671 sk
= sk_alloc(&init_net
, PF_NFC
, gfp
, &llcp_sock_proto
);
675 llcp_sock
= nfc_llcp_sock(sk
);
677 sock_init_data(sock
, sk
);
678 sk
->sk_state
= LLCP_CLOSED
;
679 sk
->sk_protocol
= NFC_SOCKPROTO_LLCP
;
681 sk
->sk_destruct
= llcp_sock_destruct
;
684 llcp_sock
->dsap
= LLCP_SAP_SDP
;
685 llcp_sock
->rw
= LLCP_DEFAULT_RW
;
686 llcp_sock
->miu
= LLCP_DEFAULT_MIU
;
687 llcp_sock
->send_n
= llcp_sock
->send_ack_n
= 0;
688 llcp_sock
->recv_n
= llcp_sock
->recv_ack_n
= 0;
689 llcp_sock
->remote_ready
= 1;
690 skb_queue_head_init(&llcp_sock
->tx_queue
);
691 skb_queue_head_init(&llcp_sock
->tx_pending_queue
);
692 skb_queue_head_init(&llcp_sock
->tx_backlog_queue
);
693 INIT_LIST_HEAD(&llcp_sock
->accept_queue
);
696 sock
->state
= SS_UNCONNECTED
;
701 void nfc_llcp_sock_free(struct nfc_llcp_sock
*sock
)
703 kfree(sock
->service_name
);
705 skb_queue_purge(&sock
->tx_queue
);
706 skb_queue_purge(&sock
->tx_pending_queue
);
707 skb_queue_purge(&sock
->tx_backlog_queue
);
709 list_del_init(&sock
->accept_queue
);
713 nfc_llcp_local_put(sock
->local
);
716 static int llcp_sock_create(struct net
*net
, struct socket
*sock
,
717 const struct nfc_protocol
*nfc_proto
)
721 pr_debug("%p\n", sock
);
723 if (sock
->type
!= SOCK_STREAM
&& sock
->type
!= SOCK_DGRAM
)
724 return -ESOCKTNOSUPPORT
;
726 sock
->ops
= &llcp_sock_ops
;
728 sk
= nfc_llcp_sock_alloc(sock
, sock
->type
, GFP_ATOMIC
);
735 static const struct nfc_protocol llcp_nfc_proto
= {
736 .id
= NFC_SOCKPROTO_LLCP
,
737 .proto
= &llcp_sock_proto
,
738 .owner
= THIS_MODULE
,
739 .create
= llcp_sock_create
742 int __init
nfc_llcp_sock_init(void)
744 return nfc_proto_register(&llcp_nfc_proto
);
747 void nfc_llcp_sock_exit(void)
749 nfc_proto_unregister(&llcp_nfc_proto
);