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_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
148 struct sock *sk = sock->sk;
149 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
150 struct nfc_llcp_local *local;
152 struct sockaddr_nfc_llcp llcp_addr;
155 if (!addr || addr->sa_family != AF_NFC)
158 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
160 memset(&llcp_addr, 0, sizeof(llcp_addr));
161 len = min_t(unsigned int, sizeof(llcp_addr), alen);
162 memcpy(&llcp_addr, addr, len);
166 if (sk->sk_state != LLCP_CLOSED) {
171 dev = nfc_get_device(llcp_addr.dev_idx);
177 local = nfc_llcp_find_local(dev);
183 llcp_sock->dev = dev;
184 llcp_sock->local = nfc_llcp_local_get(local);
185 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
187 nfc_llcp_sock_link(&local->raw_sockets, sk);
189 sk->sk_state = LLCP_BOUND;
199 static int llcp_sock_listen(struct socket *sock, int backlog)
201 struct sock *sk = sock->sk;
204 pr_debug("sk %p backlog %d\n", sk, backlog);
208 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
209 sk->sk_state != LLCP_BOUND) {
214 sk->sk_max_ack_backlog = backlog;
215 sk->sk_ack_backlog = 0;
217 pr_debug("Socket listening\n");
218 sk->sk_state = LLCP_LISTEN;
226 void nfc_llcp_accept_unlink(struct sock *sk)
228 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
230 pr_debug("state %d\n", sk->sk_state);
232 list_del_init(&llcp_sock->accept_queue);
233 sk_acceptq_removed(llcp_sock->parent);
234 llcp_sock->parent = NULL;
239 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
241 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
242 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
244 /* Lock will be free from unlink */
247 list_add_tail(&llcp_sock->accept_queue,
248 &llcp_sock_parent->accept_queue);
249 llcp_sock->parent = parent;
250 sk_acceptq_added(parent);
253 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
254 struct socket *newsock)
256 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
259 llcp_parent = nfc_llcp_sock(parent);
261 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
266 if (sk->sk_state == LLCP_CLOSED) {
268 nfc_llcp_accept_unlink(sk);
272 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
273 list_del_init(&lsk->accept_queue);
277 sock_graft(sk, newsock);
281 pr_debug("Returning sk state %d\n", sk->sk_state);
283 sk_acceptq_removed(parent);
294 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
297 DECLARE_WAITQUEUE(wait, current);
298 struct sock *sk = sock->sk, *new_sk;
302 pr_debug("parent %p\n", sk);
304 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
306 if (sk->sk_state != LLCP_LISTEN) {
311 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
313 /* Wait for an incoming connection. */
314 add_wait_queue_exclusive(sk_sleep(sk), &wait);
315 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
316 set_current_state(TASK_INTERRUPTIBLE);
323 if (signal_pending(current)) {
324 ret = sock_intr_errno(timeo);
329 timeo = schedule_timeout(timeo);
330 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
332 __set_current_state(TASK_RUNNING);
333 remove_wait_queue(sk_sleep(sk), &wait);
338 newsock->state = SS_CONNECTED;
340 pr_debug("new socket %p\n", new_sk);
348 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
351 struct sock *sk = sock->sk;
352 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
353 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
355 if (llcp_sock == NULL || llcp_sock->dev == NULL)
358 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
359 llcp_sock->dsap, llcp_sock->ssap);
361 uaddr->sa_family = AF_NFC;
363 *len = sizeof(struct sockaddr_nfc_llcp);
365 llcp_addr->dev_idx = llcp_sock->dev->idx;
366 llcp_addr->target_idx = llcp_sock->target_idx;
367 llcp_addr->dsap = llcp_sock->dsap;
368 llcp_addr->ssap = llcp_sock->ssap;
369 llcp_addr->service_name_len = llcp_sock->service_name_len;
370 memcpy(llcp_addr->service_name, llcp_sock->service_name,
371 llcp_addr->service_name_len);
376 static inline unsigned int llcp_accept_poll(struct sock *parent)
378 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
381 parent_sock = nfc_llcp_sock(parent);
383 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
387 if (sk->sk_state == LLCP_CONNECTED)
388 return POLLIN | POLLRDNORM;
394 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
397 struct sock *sk = sock->sk;
398 unsigned int mask = 0;
400 pr_debug("%p\n", sk);
402 sock_poll_wait(file, sk_sleep(sk), wait);
404 if (sk->sk_state == LLCP_LISTEN)
405 return llcp_accept_poll(sk);
407 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
410 if (!skb_queue_empty(&sk->sk_receive_queue))
411 mask |= POLLIN | POLLRDNORM;
413 if (sk->sk_state == LLCP_CLOSED)
416 if (sk->sk_shutdown & RCV_SHUTDOWN)
417 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
419 if (sk->sk_shutdown == SHUTDOWN_MASK)
422 if (sock_writeable(sk))
423 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
425 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
427 pr_debug("mask 0x%x\n", mask);
432 static int llcp_sock_release(struct socket *sock)
434 struct sock *sk = sock->sk;
435 struct nfc_llcp_local *local;
436 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
442 pr_debug("%p\n", sk);
444 local = llcp_sock->local;
453 if (sk->sk_state == LLCP_CONNECTED)
454 nfc_llcp_disconnect(llcp_sock);
456 if (sk->sk_state == LLCP_LISTEN) {
457 struct nfc_llcp_sock *lsk, *n;
458 struct sock *accept_sk;
460 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
462 accept_sk = &lsk->sk;
463 lock_sock(accept_sk);
465 nfc_llcp_disconnect(lsk);
466 nfc_llcp_accept_unlink(accept_sk);
468 release_sock(accept_sk);
472 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
473 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
477 if (sock->type == SOCK_RAW)
478 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
480 nfc_llcp_sock_unlink(&local->sockets, sk);
489 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
492 struct sock *sk = sock->sk;
493 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
494 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
496 struct nfc_llcp_local *local;
499 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
501 if (!addr || len < sizeof(struct sockaddr_nfc) ||
502 addr->sa_family != AF_NFC)
505 if (addr->service_name_len == 0 && addr->dsap == 0)
508 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
509 addr->target_idx, addr->nfc_protocol);
513 if (sk->sk_state == LLCP_CONNECTED) {
518 dev = nfc_get_device(addr->dev_idx);
524 local = nfc_llcp_find_local(dev);
530 device_lock(&dev->dev);
531 if (dev->dep_link_up == false) {
533 device_unlock(&dev->dev);
536 device_unlock(&dev->dev);
538 if (local->rf_mode == NFC_RF_INITIATOR &&
539 addr->target_idx != local->target_idx) {
544 llcp_sock->dev = dev;
545 llcp_sock->local = nfc_llcp_local_get(local);
546 llcp_sock->miu = llcp_sock->local->remote_miu;
547 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
548 if (llcp_sock->ssap == LLCP_SAP_MAX) {
553 llcp_sock->reserved_ssap = llcp_sock->ssap;
555 if (addr->service_name_len == 0)
556 llcp_sock->dsap = addr->dsap;
558 llcp_sock->dsap = LLCP_SAP_SDP;
559 llcp_sock->nfc_protocol = addr->nfc_protocol;
560 llcp_sock->service_name_len = min_t(unsigned int,
561 addr->service_name_len,
562 NFC_LLCP_MAX_SERVICE_NAME);
563 llcp_sock->service_name = kmemdup(addr->service_name,
564 llcp_sock->service_name_len,
567 nfc_llcp_sock_link(&local->connecting_sockets, sk);
569 ret = nfc_llcp_send_connect(llcp_sock);
573 ret = sock_wait_state(sk, LLCP_CONNECTED,
574 sock_sndtimeo(sk, flags & O_NONBLOCK));
583 nfc_llcp_put_ssap(local, llcp_sock->ssap);
585 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
595 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
596 struct msghdr *msg, size_t len)
598 struct sock *sk = sock->sk;
599 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
602 pr_debug("sock %p sk %p", sock, sk);
604 ret = sock_error(sk);
608 if (msg->msg_flags & MSG_OOB)
613 if (sk->sk_type == SOCK_DGRAM) {
614 struct sockaddr_nfc_llcp *addr =
615 (struct sockaddr_nfc_llcp *)msg->msg_name;
617 if (msg->msg_namelen < sizeof(*addr)) {
624 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
628 if (sk->sk_state != LLCP_CONNECTED) {
635 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
638 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
639 struct msghdr *msg, size_t len, int flags)
641 int noblock = flags & MSG_DONTWAIT;
642 struct sock *sk = sock->sk;
643 unsigned int copied, rlen;
644 struct sk_buff *skb, *cskb;
647 pr_debug("%p %zu\n", sk, len);
649 msg->msg_namelen = 0;
653 if (sk->sk_state == LLCP_CLOSED &&
654 skb_queue_empty(&sk->sk_receive_queue)) {
661 if (flags & (MSG_OOB))
664 skb = skb_recv_datagram(sk, flags, noblock, &err);
666 pr_err("Recv datagram failed state %d %d %d",
667 sk->sk_state, err, sock_error(sk));
669 if (sk->sk_shutdown & RCV_SHUTDOWN)
675 rlen = skb->len; /* real length of skb */
676 copied = min_t(unsigned int, rlen, len);
679 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
680 if (!(flags & MSG_PEEK))
681 skb_queue_head(&sk->sk_receive_queue, skb);
685 sock_recv_timestamp(msg, sk, skb);
687 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
688 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
689 struct sockaddr_nfc_llcp *sockaddr =
690 (struct sockaddr_nfc_llcp *) msg->msg_name;
692 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
694 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
696 memset(sockaddr, 0, sizeof(*sockaddr));
697 sockaddr->sa_family = AF_NFC;
698 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
699 sockaddr->dsap = ui_cb->dsap;
700 sockaddr->ssap = ui_cb->ssap;
703 /* Mark read part of skb as used */
704 if (!(flags & MSG_PEEK)) {
706 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
707 if (sk->sk_type == SOCK_STREAM ||
708 sk->sk_type == SOCK_DGRAM ||
709 sk->sk_type == SOCK_RAW) {
710 skb_pull(skb, copied);
712 skb_queue_head(&sk->sk_receive_queue, skb);
720 /* XXX Queue backlogged skbs */
723 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
724 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
730 static const struct proto_ops llcp_sock_ops = {
732 .owner = THIS_MODULE,
733 .bind = llcp_sock_bind,
734 .connect = llcp_sock_connect,
735 .release = llcp_sock_release,
736 .socketpair = sock_no_socketpair,
737 .accept = llcp_sock_accept,
738 .getname = llcp_sock_getname,
739 .poll = llcp_sock_poll,
740 .ioctl = sock_no_ioctl,
741 .listen = llcp_sock_listen,
742 .shutdown = sock_no_shutdown,
743 .setsockopt = sock_no_setsockopt,
744 .getsockopt = sock_no_getsockopt,
745 .sendmsg = llcp_sock_sendmsg,
746 .recvmsg = llcp_sock_recvmsg,
747 .mmap = sock_no_mmap,
750 static const struct proto_ops llcp_rawsock_ops = {
752 .owner = THIS_MODULE,
753 .bind = llcp_raw_sock_bind,
754 .connect = sock_no_connect,
755 .release = llcp_sock_release,
756 .socketpair = sock_no_socketpair,
757 .accept = sock_no_accept,
758 .getname = llcp_sock_getname,
759 .poll = llcp_sock_poll,
760 .ioctl = sock_no_ioctl,
761 .listen = sock_no_listen,
762 .shutdown = sock_no_shutdown,
763 .setsockopt = sock_no_setsockopt,
764 .getsockopt = sock_no_getsockopt,
765 .sendmsg = sock_no_sendmsg,
766 .recvmsg = llcp_sock_recvmsg,
767 .mmap = sock_no_mmap,
770 static void llcp_sock_destruct(struct sock *sk)
772 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
774 pr_debug("%p\n", sk);
776 if (sk->sk_state == LLCP_CONNECTED)
777 nfc_put_device(llcp_sock->dev);
779 skb_queue_purge(&sk->sk_receive_queue);
781 nfc_llcp_sock_free(llcp_sock);
783 if (!sock_flag(sk, SOCK_DEAD)) {
784 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
789 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
792 struct nfc_llcp_sock *llcp_sock;
794 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
798 llcp_sock = nfc_llcp_sock(sk);
800 sock_init_data(sock, sk);
801 sk->sk_state = LLCP_CLOSED;
802 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
804 sk->sk_destruct = llcp_sock_destruct;
807 llcp_sock->dsap = LLCP_SAP_SDP;
808 llcp_sock->rw = LLCP_DEFAULT_RW;
809 llcp_sock->miu = LLCP_DEFAULT_MIU;
810 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
811 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
812 llcp_sock->remote_ready = 1;
813 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
814 skb_queue_head_init(&llcp_sock->tx_queue);
815 skb_queue_head_init(&llcp_sock->tx_pending_queue);
816 INIT_LIST_HEAD(&llcp_sock->accept_queue);
819 sock->state = SS_UNCONNECTED;
824 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
826 kfree(sock->service_name);
828 skb_queue_purge(&sock->tx_queue);
829 skb_queue_purge(&sock->tx_pending_queue);
831 list_del_init(&sock->accept_queue);
835 nfc_llcp_local_put(sock->local);
838 static int llcp_sock_create(struct net *net, struct socket *sock,
839 const struct nfc_protocol *nfc_proto)
843 pr_debug("%p\n", sock);
845 if (sock->type != SOCK_STREAM &&
846 sock->type != SOCK_DGRAM &&
847 sock->type != SOCK_RAW)
848 return -ESOCKTNOSUPPORT;
850 if (sock->type == SOCK_RAW)
851 sock->ops = &llcp_rawsock_ops;
853 sock->ops = &llcp_sock_ops;
855 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
862 static const struct nfc_protocol llcp_nfc_proto = {
863 .id = NFC_SOCKPROTO_LLCP,
864 .proto = &llcp_sock_proto,
865 .owner = THIS_MODULE,
866 .create = llcp_sock_create
869 int __init nfc_llcp_sock_init(void)
871 return nfc_proto_register(&llcp_nfc_proto);
874 void nfc_llcp_sock_exit(void)
876 nfc_proto_unregister(&llcp_nfc_proto);