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 if (!addr || addr->sa_family != AF_NFC)
84 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
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_SAP_MAX) {
129 llcp_sock->reserved_ssap = llcp_sock->ssap;
131 nfc_llcp_sock_link(&local->sockets, sk);
133 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
135 sk->sk_state = LLCP_BOUND;
145 static int llcp_sock_listen(struct socket *sock, int backlog)
147 struct sock *sk = sock->sk;
150 pr_debug("sk %p backlog %d\n", sk, backlog);
154 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
155 || sk->sk_state != LLCP_BOUND) {
160 sk->sk_max_ack_backlog = backlog;
161 sk->sk_ack_backlog = 0;
163 pr_debug("Socket listening\n");
164 sk->sk_state = LLCP_LISTEN;
172 void nfc_llcp_accept_unlink(struct sock *sk)
174 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
176 pr_debug("state %d\n", sk->sk_state);
178 list_del_init(&llcp_sock->accept_queue);
179 sk_acceptq_removed(llcp_sock->parent);
180 llcp_sock->parent = NULL;
185 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
187 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
188 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
190 /* Lock will be free from unlink */
193 list_add_tail(&llcp_sock->accept_queue,
194 &llcp_sock_parent->accept_queue);
195 llcp_sock->parent = parent;
196 sk_acceptq_added(parent);
199 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
200 struct socket *newsock)
202 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
205 llcp_parent = nfc_llcp_sock(parent);
207 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
212 if (sk->sk_state == LLCP_CLOSED) {
214 nfc_llcp_accept_unlink(sk);
218 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
219 nfc_llcp_accept_unlink(sk);
221 sock_graft(sk, newsock);
225 pr_debug("Returning sk state %d\n", sk->sk_state);
236 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
239 DECLARE_WAITQUEUE(wait, current);
240 struct sock *sk = sock->sk, *new_sk;
244 pr_debug("parent %p\n", sk);
246 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
248 if (sk->sk_state != LLCP_LISTEN) {
253 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
255 /* Wait for an incoming connection. */
256 add_wait_queue_exclusive(sk_sleep(sk), &wait);
257 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
258 set_current_state(TASK_INTERRUPTIBLE);
265 if (signal_pending(current)) {
266 ret = sock_intr_errno(timeo);
271 timeo = schedule_timeout(timeo);
272 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
274 __set_current_state(TASK_RUNNING);
275 remove_wait_queue(sk_sleep(sk), &wait);
280 newsock->state = SS_CONNECTED;
282 pr_debug("new socket %p\n", new_sk);
290 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
293 struct sock *sk = sock->sk;
294 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
295 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
297 if (llcp_sock == NULL || llcp_sock->dev == NULL)
300 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
301 llcp_sock->dsap, llcp_sock->ssap);
303 if (llcp_sock == NULL || llcp_sock->dev == NULL)
306 uaddr->sa_family = AF_NFC;
308 *len = sizeof(struct sockaddr_nfc_llcp);
310 llcp_addr->dev_idx = llcp_sock->dev->idx;
311 llcp_addr->target_idx = llcp_sock->target_idx;
312 llcp_addr->dsap = llcp_sock->dsap;
313 llcp_addr->ssap = llcp_sock->ssap;
314 llcp_addr->service_name_len = llcp_sock->service_name_len;
315 memcpy(llcp_addr->service_name, llcp_sock->service_name,
316 llcp_addr->service_name_len);
321 static inline unsigned int llcp_accept_poll(struct sock *parent)
323 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
326 parent_sock = nfc_llcp_sock(parent);
328 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
332 if (sk->sk_state == LLCP_CONNECTED)
333 return POLLIN | POLLRDNORM;
339 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
342 struct sock *sk = sock->sk;
343 unsigned int mask = 0;
345 pr_debug("%p\n", sk);
347 sock_poll_wait(file, sk_sleep(sk), wait);
349 if (sk->sk_state == LLCP_LISTEN)
350 return llcp_accept_poll(sk);
352 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
355 if (!skb_queue_empty(&sk->sk_receive_queue))
356 mask |= POLLIN | POLLRDNORM;
358 if (sk->sk_state == LLCP_CLOSED)
361 if (sk->sk_shutdown & RCV_SHUTDOWN)
362 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
364 if (sk->sk_shutdown == SHUTDOWN_MASK)
367 if (sock_writeable(sk))
368 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
370 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
372 pr_debug("mask 0x%x\n", mask);
377 static int llcp_sock_release(struct socket *sock)
379 struct sock *sk = sock->sk;
380 struct nfc_llcp_local *local;
381 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
387 pr_debug("%p\n", sk);
389 local = llcp_sock->local;
398 if (sk->sk_state == LLCP_CONNECTED)
399 nfc_llcp_disconnect(llcp_sock);
401 if (sk->sk_state == LLCP_LISTEN) {
402 struct nfc_llcp_sock *lsk, *n;
403 struct sock *accept_sk;
405 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
407 accept_sk = &lsk->sk;
408 lock_sock(accept_sk);
410 nfc_llcp_disconnect(lsk);
411 nfc_llcp_accept_unlink(accept_sk);
413 release_sock(accept_sk);
415 sock_orphan(accept_sk);
419 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
420 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
424 nfc_llcp_sock_unlink(&local->sockets, sk);
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 = nfc_llcp_local_get(local);
494 llcp_sock->miu = llcp_sock->local->remote_miu;
495 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
496 if (llcp_sock->ssap == LLCP_SAP_MAX) {
501 llcp_sock->reserved_ssap = llcp_sock->ssap;
503 if (addr->service_name_len == 0)
504 llcp_sock->dsap = addr->dsap;
506 llcp_sock->dsap = LLCP_SAP_SDP;
507 llcp_sock->nfc_protocol = addr->nfc_protocol;
508 llcp_sock->service_name_len = min_t(unsigned int,
509 addr->service_name_len,
510 NFC_LLCP_MAX_SERVICE_NAME);
511 llcp_sock->service_name = kmemdup(addr->service_name,
512 llcp_sock->service_name_len,
515 nfc_llcp_sock_link(&local->connecting_sockets, sk);
517 ret = nfc_llcp_send_connect(llcp_sock);
521 ret = sock_wait_state(sk, LLCP_CONNECTED,
522 sock_sndtimeo(sk, flags & O_NONBLOCK));
531 nfc_llcp_put_ssap(local, llcp_sock->ssap);
533 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
543 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
544 struct msghdr *msg, size_t len)
546 struct sock *sk = sock->sk;
547 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
550 pr_debug("sock %p sk %p", sock, sk);
552 ret = sock_error(sk);
556 if (msg->msg_flags & MSG_OOB)
561 if (sk->sk_state != LLCP_CONNECTED) {
568 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
571 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
572 struct msghdr *msg, size_t len, int flags)
574 int noblock = flags & MSG_DONTWAIT;
575 struct sock *sk = sock->sk;
576 unsigned int copied, rlen;
577 struct sk_buff *skb, *cskb;
580 pr_debug("%p %zu\n", sk, len);
584 if (sk->sk_state == LLCP_CLOSED &&
585 skb_queue_empty(&sk->sk_receive_queue)) {
592 if (flags & (MSG_OOB))
595 skb = skb_recv_datagram(sk, flags, noblock, &err);
597 pr_err("Recv datagram failed state %d %d %d",
598 sk->sk_state, err, sock_error(sk));
600 if (sk->sk_shutdown & RCV_SHUTDOWN)
606 rlen = skb->len; /* real length of skb */
607 copied = min_t(unsigned int, rlen, len);
610 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
611 if (!(flags & MSG_PEEK))
612 skb_queue_head(&sk->sk_receive_queue, skb);
616 /* Mark read part of skb as used */
617 if (!(flags & MSG_PEEK)) {
619 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
620 if (sk->sk_type == SOCK_STREAM) {
621 skb_pull(skb, copied);
623 skb_queue_head(&sk->sk_receive_queue, skb);
631 /* XXX Queue backlogged skbs */
634 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
635 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
641 static const struct proto_ops llcp_sock_ops = {
643 .owner = THIS_MODULE,
644 .bind = llcp_sock_bind,
645 .connect = llcp_sock_connect,
646 .release = llcp_sock_release,
647 .socketpair = sock_no_socketpair,
648 .accept = llcp_sock_accept,
649 .getname = llcp_sock_getname,
650 .poll = llcp_sock_poll,
651 .ioctl = sock_no_ioctl,
652 .listen = llcp_sock_listen,
653 .shutdown = sock_no_shutdown,
654 .setsockopt = sock_no_setsockopt,
655 .getsockopt = sock_no_getsockopt,
656 .sendmsg = llcp_sock_sendmsg,
657 .recvmsg = llcp_sock_recvmsg,
658 .mmap = sock_no_mmap,
661 static void llcp_sock_destruct(struct sock *sk)
663 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
665 pr_debug("%p\n", sk);
667 if (sk->sk_state == LLCP_CONNECTED)
668 nfc_put_device(llcp_sock->dev);
670 skb_queue_purge(&sk->sk_receive_queue);
672 nfc_llcp_sock_free(llcp_sock);
674 if (!sock_flag(sk, SOCK_DEAD)) {
675 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
680 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
683 struct nfc_llcp_sock *llcp_sock;
685 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
689 llcp_sock = nfc_llcp_sock(sk);
691 sock_init_data(sock, sk);
692 sk->sk_state = LLCP_CLOSED;
693 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
695 sk->sk_destruct = llcp_sock_destruct;
698 llcp_sock->dsap = LLCP_SAP_SDP;
699 llcp_sock->rw = LLCP_DEFAULT_RW;
700 llcp_sock->miu = LLCP_DEFAULT_MIU;
701 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
702 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
703 llcp_sock->remote_ready = 1;
704 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
705 skb_queue_head_init(&llcp_sock->tx_queue);
706 skb_queue_head_init(&llcp_sock->tx_pending_queue);
707 skb_queue_head_init(&llcp_sock->tx_backlog_queue);
708 INIT_LIST_HEAD(&llcp_sock->accept_queue);
711 sock->state = SS_UNCONNECTED;
716 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
718 kfree(sock->service_name);
720 skb_queue_purge(&sock->tx_queue);
721 skb_queue_purge(&sock->tx_pending_queue);
722 skb_queue_purge(&sock->tx_backlog_queue);
724 list_del_init(&sock->accept_queue);
728 nfc_llcp_local_put(sock->local);
731 static int llcp_sock_create(struct net *net, struct socket *sock,
732 const struct nfc_protocol *nfc_proto)
736 pr_debug("%p\n", sock);
738 if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
739 return -ESOCKTNOSUPPORT;
741 sock->ops = &llcp_sock_ops;
743 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
750 static const struct nfc_protocol llcp_nfc_proto = {
751 .id = NFC_SOCKPROTO_LLCP,
752 .proto = &llcp_sock_proto,
753 .owner = THIS_MODULE,
754 .create = llcp_sock_create
757 int __init nfc_llcp_sock_init(void)
759 return nfc_proto_register(&llcp_nfc_proto);
762 void nfc_llcp_sock_exit(void)
764 nfc_proto_unregister(&llcp_nfc_proto);