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 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
227 char __user *optval, unsigned int optlen)
229 struct sock *sk = sock->sk;
230 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
234 pr_debug("%p optname %d\n", sk, optname);
236 if (level != SOL_NFC)
243 if (sk->sk_state == LLCP_CONNECTED ||
244 sk->sk_state == LLCP_BOUND ||
245 sk->sk_state == LLCP_LISTEN) {
250 if (get_user(opt, (u32 __user *) optval)) {
255 if (opt > LLCP_MAX_RW) {
260 llcp_sock->rw = (u8) opt;
265 if (sk->sk_state == LLCP_CONNECTED ||
266 sk->sk_state == LLCP_BOUND ||
267 sk->sk_state == LLCP_LISTEN) {
272 if (get_user(opt, (u32 __user *) optval)) {
277 if (opt > LLCP_MAX_MIUX) {
282 llcp_sock->miux = (u16) opt;
293 pr_debug("%p rw %d miux %d\n", llcp_sock,
294 llcp_sock->rw, llcp_sock->miux);
299 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, int __user *optlen)
302 struct sock *sk = sock->sk;
303 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
306 pr_debug("%p optname %d\n", sk, optname);
308 if (level != SOL_NFC)
311 if (get_user(len, optlen))
314 len = min_t(u32, len, sizeof(u32));
320 if (put_user(llcp_sock->rw, (u32 __user *) optval))
326 if (put_user(llcp_sock->miux, (u32 __user *) optval))
338 if (put_user(len, optlen))
344 void nfc_llcp_accept_unlink(struct sock *sk)
346 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
348 pr_debug("state %d\n", sk->sk_state);
350 list_del_init(&llcp_sock->accept_queue);
351 sk_acceptq_removed(llcp_sock->parent);
352 llcp_sock->parent = NULL;
357 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
359 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
360 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
362 /* Lock will be free from unlink */
365 list_add_tail(&llcp_sock->accept_queue,
366 &llcp_sock_parent->accept_queue);
367 llcp_sock->parent = parent;
368 sk_acceptq_added(parent);
371 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
372 struct socket *newsock)
374 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
377 llcp_parent = nfc_llcp_sock(parent);
379 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
384 if (sk->sk_state == LLCP_CLOSED) {
386 nfc_llcp_accept_unlink(sk);
390 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
391 nfc_llcp_accept_unlink(sk);
393 sock_graft(sk, newsock);
397 pr_debug("Returning sk state %d\n", sk->sk_state);
399 sk_acceptq_removed(parent);
410 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
413 DECLARE_WAITQUEUE(wait, current);
414 struct sock *sk = sock->sk, *new_sk;
418 pr_debug("parent %p\n", sk);
420 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
422 if (sk->sk_state != LLCP_LISTEN) {
427 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
429 /* Wait for an incoming connection. */
430 add_wait_queue_exclusive(sk_sleep(sk), &wait);
431 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
432 set_current_state(TASK_INTERRUPTIBLE);
439 if (signal_pending(current)) {
440 ret = sock_intr_errno(timeo);
445 timeo = schedule_timeout(timeo);
446 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
448 __set_current_state(TASK_RUNNING);
449 remove_wait_queue(sk_sleep(sk), &wait);
454 newsock->state = SS_CONNECTED;
456 pr_debug("new socket %p\n", new_sk);
464 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
467 struct sock *sk = sock->sk;
468 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
469 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
471 if (llcp_sock == NULL || llcp_sock->dev == NULL)
474 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
475 llcp_sock->dsap, llcp_sock->ssap);
477 uaddr->sa_family = AF_NFC;
479 *len = sizeof(struct sockaddr_nfc_llcp);
481 llcp_addr->dev_idx = llcp_sock->dev->idx;
482 llcp_addr->target_idx = llcp_sock->target_idx;
483 llcp_addr->dsap = llcp_sock->dsap;
484 llcp_addr->ssap = llcp_sock->ssap;
485 llcp_addr->service_name_len = llcp_sock->service_name_len;
486 memcpy(llcp_addr->service_name, llcp_sock->service_name,
487 llcp_addr->service_name_len);
492 static inline unsigned int llcp_accept_poll(struct sock *parent)
494 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
497 parent_sock = nfc_llcp_sock(parent);
499 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
503 if (sk->sk_state == LLCP_CONNECTED)
504 return POLLIN | POLLRDNORM;
510 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
513 struct sock *sk = sock->sk;
514 unsigned int mask = 0;
516 pr_debug("%p\n", sk);
518 sock_poll_wait(file, sk_sleep(sk), wait);
520 if (sk->sk_state == LLCP_LISTEN)
521 return llcp_accept_poll(sk);
523 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
526 if (!skb_queue_empty(&sk->sk_receive_queue))
527 mask |= POLLIN | POLLRDNORM;
529 if (sk->sk_state == LLCP_CLOSED)
532 if (sk->sk_shutdown & RCV_SHUTDOWN)
533 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
535 if (sk->sk_shutdown == SHUTDOWN_MASK)
538 if (sock_writeable(sk))
539 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
541 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
543 pr_debug("mask 0x%x\n", mask);
548 static int llcp_sock_release(struct socket *sock)
550 struct sock *sk = sock->sk;
551 struct nfc_llcp_local *local;
552 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
558 pr_debug("%p\n", sk);
560 local = llcp_sock->local;
569 if (sk->sk_state == LLCP_CONNECTED)
570 nfc_llcp_disconnect(llcp_sock);
572 if (sk->sk_state == LLCP_LISTEN) {
573 struct nfc_llcp_sock *lsk, *n;
574 struct sock *accept_sk;
576 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
578 accept_sk = &lsk->sk;
579 lock_sock(accept_sk);
581 nfc_llcp_disconnect(lsk);
582 nfc_llcp_accept_unlink(accept_sk);
584 release_sock(accept_sk);
586 sock_orphan(accept_sk);
590 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
591 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
595 if (sock->type == SOCK_RAW)
596 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
598 nfc_llcp_sock_unlink(&local->sockets, sk);
607 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
610 struct sock *sk = sock->sk;
611 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
612 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
614 struct nfc_llcp_local *local;
617 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
619 if (!addr || len < sizeof(struct sockaddr_nfc) ||
620 addr->sa_family != AF_NFC)
623 if (addr->service_name_len == 0 && addr->dsap == 0)
626 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
627 addr->target_idx, addr->nfc_protocol);
631 if (sk->sk_state == LLCP_CONNECTED) {
636 dev = nfc_get_device(addr->dev_idx);
642 local = nfc_llcp_find_local(dev);
648 device_lock(&dev->dev);
649 if (dev->dep_link_up == false) {
651 device_unlock(&dev->dev);
654 device_unlock(&dev->dev);
656 if (local->rf_mode == NFC_RF_INITIATOR &&
657 addr->target_idx != local->target_idx) {
662 llcp_sock->dev = dev;
663 llcp_sock->local = nfc_llcp_local_get(local);
664 llcp_sock->remote_miu = llcp_sock->local->remote_miu;
665 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
666 if (llcp_sock->ssap == LLCP_SAP_MAX) {
671 llcp_sock->reserved_ssap = llcp_sock->ssap;
673 if (addr->service_name_len == 0)
674 llcp_sock->dsap = addr->dsap;
676 llcp_sock->dsap = LLCP_SAP_SDP;
677 llcp_sock->nfc_protocol = addr->nfc_protocol;
678 llcp_sock->service_name_len = min_t(unsigned int,
679 addr->service_name_len,
680 NFC_LLCP_MAX_SERVICE_NAME);
681 llcp_sock->service_name = kmemdup(addr->service_name,
682 llcp_sock->service_name_len,
685 nfc_llcp_sock_link(&local->connecting_sockets, sk);
687 ret = nfc_llcp_send_connect(llcp_sock);
691 ret = sock_wait_state(sk, LLCP_CONNECTED,
692 sock_sndtimeo(sk, flags & O_NONBLOCK));
701 nfc_llcp_put_ssap(local, llcp_sock->ssap);
703 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
713 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
714 struct msghdr *msg, size_t len)
716 struct sock *sk = sock->sk;
717 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
720 pr_debug("sock %p sk %p", sock, sk);
722 ret = sock_error(sk);
726 if (msg->msg_flags & MSG_OOB)
731 if (sk->sk_type == SOCK_DGRAM) {
732 struct sockaddr_nfc_llcp *addr =
733 (struct sockaddr_nfc_llcp *)msg->msg_name;
735 if (msg->msg_namelen < sizeof(*addr)) {
742 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
746 if (sk->sk_state != LLCP_CONNECTED) {
753 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
756 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
757 struct msghdr *msg, size_t len, int flags)
759 int noblock = flags & MSG_DONTWAIT;
760 struct sock *sk = sock->sk;
761 unsigned int copied, rlen;
762 struct sk_buff *skb, *cskb;
765 pr_debug("%p %zu\n", sk, len);
769 if (sk->sk_state == LLCP_CLOSED &&
770 skb_queue_empty(&sk->sk_receive_queue)) {
777 if (flags & (MSG_OOB))
780 skb = skb_recv_datagram(sk, flags, noblock, &err);
782 pr_err("Recv datagram failed state %d %d %d",
783 sk->sk_state, err, sock_error(sk));
785 if (sk->sk_shutdown & RCV_SHUTDOWN)
791 rlen = skb->len; /* real length of skb */
792 copied = min_t(unsigned int, rlen, len);
795 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
796 if (!(flags & MSG_PEEK))
797 skb_queue_head(&sk->sk_receive_queue, skb);
801 sock_recv_timestamp(msg, sk, skb);
803 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
804 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
805 struct sockaddr_nfc_llcp *sockaddr =
806 (struct sockaddr_nfc_llcp *) msg->msg_name;
808 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
810 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
812 sockaddr->sa_family = AF_NFC;
813 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
814 sockaddr->dsap = ui_cb->dsap;
815 sockaddr->ssap = ui_cb->ssap;
818 /* Mark read part of skb as used */
819 if (!(flags & MSG_PEEK)) {
821 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
822 if (sk->sk_type == SOCK_STREAM ||
823 sk->sk_type == SOCK_DGRAM ||
824 sk->sk_type == SOCK_RAW) {
825 skb_pull(skb, copied);
827 skb_queue_head(&sk->sk_receive_queue, skb);
835 /* XXX Queue backlogged skbs */
838 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
839 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
845 static const struct proto_ops llcp_sock_ops = {
847 .owner = THIS_MODULE,
848 .bind = llcp_sock_bind,
849 .connect = llcp_sock_connect,
850 .release = llcp_sock_release,
851 .socketpair = sock_no_socketpair,
852 .accept = llcp_sock_accept,
853 .getname = llcp_sock_getname,
854 .poll = llcp_sock_poll,
855 .ioctl = sock_no_ioctl,
856 .listen = llcp_sock_listen,
857 .shutdown = sock_no_shutdown,
858 .setsockopt = nfc_llcp_setsockopt,
859 .getsockopt = nfc_llcp_getsockopt,
860 .sendmsg = llcp_sock_sendmsg,
861 .recvmsg = llcp_sock_recvmsg,
862 .mmap = sock_no_mmap,
865 static const struct proto_ops llcp_rawsock_ops = {
867 .owner = THIS_MODULE,
868 .bind = llcp_raw_sock_bind,
869 .connect = sock_no_connect,
870 .release = llcp_sock_release,
871 .socketpair = sock_no_socketpair,
872 .accept = sock_no_accept,
873 .getname = llcp_sock_getname,
874 .poll = llcp_sock_poll,
875 .ioctl = sock_no_ioctl,
876 .listen = sock_no_listen,
877 .shutdown = sock_no_shutdown,
878 .setsockopt = sock_no_setsockopt,
879 .getsockopt = sock_no_getsockopt,
880 .sendmsg = sock_no_sendmsg,
881 .recvmsg = llcp_sock_recvmsg,
882 .mmap = sock_no_mmap,
885 static void llcp_sock_destruct(struct sock *sk)
887 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
889 pr_debug("%p\n", sk);
891 if (sk->sk_state == LLCP_CONNECTED)
892 nfc_put_device(llcp_sock->dev);
894 skb_queue_purge(&sk->sk_receive_queue);
896 nfc_llcp_sock_free(llcp_sock);
898 if (!sock_flag(sk, SOCK_DEAD)) {
899 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
904 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
907 struct nfc_llcp_sock *llcp_sock;
909 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
913 llcp_sock = nfc_llcp_sock(sk);
915 sock_init_data(sock, sk);
916 sk->sk_state = LLCP_CLOSED;
917 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
919 sk->sk_destruct = llcp_sock_destruct;
922 llcp_sock->dsap = LLCP_SAP_SDP;
923 llcp_sock->rw = LLCP_MAX_RW + 1;
924 llcp_sock->miux = LLCP_MAX_MIUX + 1;
925 llcp_sock->remote_rw = LLCP_DEFAULT_RW;
926 llcp_sock->remote_miu = LLCP_DEFAULT_MIU;
927 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
928 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
929 llcp_sock->remote_ready = 1;
930 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
931 skb_queue_head_init(&llcp_sock->tx_queue);
932 skb_queue_head_init(&llcp_sock->tx_pending_queue);
933 INIT_LIST_HEAD(&llcp_sock->accept_queue);
936 sock->state = SS_UNCONNECTED;
941 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
943 kfree(sock->service_name);
945 skb_queue_purge(&sock->tx_queue);
946 skb_queue_purge(&sock->tx_pending_queue);
948 list_del_init(&sock->accept_queue);
952 nfc_llcp_local_put(sock->local);
955 static int llcp_sock_create(struct net *net, struct socket *sock,
956 const struct nfc_protocol *nfc_proto)
960 pr_debug("%p\n", sock);
962 if (sock->type != SOCK_STREAM &&
963 sock->type != SOCK_DGRAM &&
964 sock->type != SOCK_RAW)
965 return -ESOCKTNOSUPPORT;
967 if (sock->type == SOCK_RAW)
968 sock->ops = &llcp_rawsock_ops;
970 sock->ops = &llcp_sock_ops;
972 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
979 static const struct nfc_protocol llcp_nfc_proto = {
980 .id = NFC_SOCKPROTO_LLCP,
981 .proto = &llcp_sock_proto,
982 .owner = THIS_MODULE,
983 .create = llcp_sock_create
986 int __init nfc_llcp_sock_init(void)
988 return nfc_proto_register(&llcp_nfc_proto);
991 void nfc_llcp_sock_exit(void)
993 nfc_proto_unregister(&llcp_nfc_proto);