[deliverable/linux.git] / net / nfc / rawsock.c

/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <net/tcp_states.h>
#include <linux/nfc.h>

#include "nfc.h"

static void rawsock_write_queue_purge(struct sock *sk)
{
	nfc_dbg("sk=%p", sk);

	spin_lock_bh(&sk->sk_write_queue.lock);
	__skb_queue_purge(&sk->sk_write_queue);
	nfc_rawsock(sk)->tx_work_scheduled = false;
	spin_unlock_bh(&sk->sk_write_queue.lock);
}

static void rawsock_report_error(struct sock *sk, int err)
{
	nfc_dbg("sk=%p err=%d", sk, err);

	sk->sk_shutdown = SHUTDOWN_MASK;
	sk->sk_err = -err;
	sk->sk_error_report(sk);

	rawsock_write_queue_purge(sk);
}

static int rawsock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	nfc_dbg("sock=%p", sock);

	sock_orphan(sk);
	sock_put(sk);

	return 0;
}

static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
							int len, int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
	struct nfc_dev *dev;
	int rc = 0;

	nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags);

	if (!addr || len < sizeof(struct sockaddr_nfc) ||
		addr->sa_family != AF_NFC)
		return -EINVAL;

	nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx,
					addr->target_idx, addr->nfc_protocol);

	lock_sock(sk);

	if (sock->state == SS_CONNECTED) {
		rc = -EISCONN;
		goto error;
	}

	dev = nfc_get_device(addr->dev_idx);
	if (!dev) {
		rc = -ENODEV;
		goto error;
	}

	if (addr->target_idx > dev->target_idx - 1 ||
		addr->target_idx < dev->target_idx - dev->n_targets) {
		rc = -EINVAL;
		goto error;
	}

	if (addr->target_idx > dev->target_idx - 1 ||
		addr->target_idx < dev->target_idx - dev->n_targets) {
		rc = -EINVAL;
		goto error;
	}

	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
	if (rc)
		goto put_dev;

	nfc_rawsock(sk)->dev = dev;
	nfc_rawsock(sk)->target_idx = addr->target_idx;
	sock->state = SS_CONNECTED;
	sk->sk_state = TCP_ESTABLISHED;
	sk->sk_state_change(sk);

	release_sock(sk);
	return 0;

put_dev:
	nfc_put_device(dev);
error:
	release_sock(sk);
	return rc;
}

static int rawsock_add_header(struct sk_buff *skb)
{

	if (skb_cow_head(skb, 1))
		return -ENOMEM;

	*skb_push(skb, 1) = 0;

	return 0;
}

static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
								int err)
{
	struct sock *sk = (struct sock *) context;

	BUG_ON(in_irq());

	nfc_dbg("sk=%p err=%d", sk, err);

	if (err)
		goto error;

	err = rawsock_add_header(skb);
	if (err)
		goto error;

	err = sock_queue_rcv_skb(sk, skb);
	if (err)
		goto error;

	spin_lock_bh(&sk->sk_write_queue.lock);
	if (!skb_queue_empty(&sk->sk_write_queue))
		schedule_work(&nfc_rawsock(sk)->tx_work);
	else
		nfc_rawsock(sk)->tx_work_scheduled = false;
	spin_unlock_bh(&sk->sk_write_queue.lock);

	sock_put(sk);
	return;

error:
	rawsock_report_error(sk, err);
	sock_put(sk);
}

static void rawsock_tx_work(struct work_struct *work)
{
	struct sock *sk = to_rawsock_sk(work);
	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	u32 target_idx = nfc_rawsock(sk)->target_idx;
	struct sk_buff *skb;
	int rc;

	nfc_dbg("sk=%p target_idx=%u", sk, target_idx);

	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		rawsock_write_queue_purge(sk);
		return;
	}

	skb = skb_dequeue(&sk->sk_write_queue);

	sock_hold(sk);
	rc = nfc_data_exchange(dev, target_idx, skb,
				rawsock_data_exchange_complete, sk);
	if (rc) {
		rawsock_report_error(sk, rc);
		sock_put(sk);
	}
}

static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
					struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int rc;

	nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len);

	if (msg->msg_namelen)
		return -EOPNOTSUPP;

	if (sock->state != SS_CONNECTED)
		return -ENOTCONN;

	skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT,
									&rc);
	if (!skb)
		return rc;

	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc < 0) {
		kfree_skb(skb);
		return rc;
	}

	spin_lock_bh(&sk->sk_write_queue.lock);
	__skb_queue_tail(&sk->sk_write_queue, skb);
	if (!nfc_rawsock(sk)->tx_work_scheduled) {
		schedule_work(&nfc_rawsock(sk)->tx_work);
		nfc_rawsock(sk)->tx_work_scheduled = true;
	}
	spin_unlock_bh(&sk->sk_write_queue.lock);

	return len;
}

static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
				struct msghdr *msg, size_t len, int flags)
{
	int noblock = flags & MSG_DONTWAIT;
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int copied;
	int rc;

	nfc_dbg("sock=%p sk=%p len=%zu flags=%d", sock, sk, len, flags);

	skb = skb_recv_datagram(sk, flags, noblock, &rc);
	if (!skb)
		return rc;

	msg->msg_namelen = 0;

	copied = skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

	skb_free_datagram(sk, skb);

	return rc ? : copied;
}


static const struct proto_ops rawsock_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.release        = rawsock_release,
	.bind           = sock_no_bind,
	.connect        = rawsock_connect,
	.socketpair     = sock_no_socketpair,
	.accept         = sock_no_accept,
	.getname        = sock_no_getname,
	.poll           = datagram_poll,
	.ioctl          = sock_no_ioctl,
	.listen         = sock_no_listen,
	.shutdown       = sock_no_shutdown,
	.setsockopt     = sock_no_setsockopt,
	.getsockopt     = sock_no_getsockopt,
	.sendmsg        = rawsock_sendmsg,
	.recvmsg        = rawsock_recvmsg,
	.mmap           = sock_no_mmap,
};

static void rawsock_destruct(struct sock *sk)
{
	nfc_dbg("sk=%p", sk);

	if (sk->sk_state == TCP_ESTABLISHED) {
		nfc_deactivate_target(nfc_rawsock(sk)->dev,
					nfc_rawsock(sk)->target_idx);
		nfc_put_device(nfc_rawsock(sk)->dev);
	}

	skb_queue_purge(&sk->sk_receive_queue);

	if (!sock_flag(sk, SOCK_DEAD)) {
		nfc_err("Freeing alive NFC raw socket %p", sk);
		return;
	}
}

static int rawsock_create(struct net *net, struct socket *sock,
				const struct nfc_protocol *nfc_proto)
{
	struct sock *sk;

	nfc_dbg("sock=%p", sock);

	if (sock->type != SOCK_SEQPACKET)
		return -ESOCKTNOSUPPORT;

	sock->ops = &rawsock_ops;

	sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto);
	if (!sk)
		return -ENOMEM;

	sock_init_data(sock, sk);
	sk->sk_protocol = nfc_proto->id;
	sk->sk_destruct = rawsock_destruct;
	sock->state = SS_UNCONNECTED;

	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
	nfc_rawsock(sk)->tx_work_scheduled = false;

	return 0;
}

static struct proto rawsock_proto = {
	.name     = "NFC_RAW",
	.owner    = THIS_MODULE,
	.obj_size = sizeof(struct nfc_rawsock),
};

static const struct nfc_protocol rawsock_nfc_proto = {
	.id	  = NFC_SOCKPROTO_RAW,
	.proto    = &rawsock_proto,
	.owner    = THIS_MODULE,
	.create   = rawsock_create
};

int __init rawsock_init(void)
{
	int rc;

	rc = nfc_proto_register(&rawsock_nfc_proto);

	return rc;
}

void rawsock_exit(void)
{
	nfc_proto_unregister(&rawsock_nfc_proto);
}
Commit	Line	Data
23b7869c LRV	1	/*
	2	* Copyright (C) 2011 Instituto Nokia de Tecnologia
	3	*
	4	* Authors:
	5	* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
	6	* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the
	20	* Free Software Foundation, Inc.,
	21	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
	23
	24	#include <net/tcp_states.h>
	25	#include <linux/nfc.h>
	26
	27	#include "nfc.h"
	28
	29	static void rawsock_write_queue_purge(struct sock *sk)
	30	{
	31	nfc_dbg("sk=%p", sk);
	32
	33	spin_lock_bh(&sk->sk_write_queue.lock);
	34	__skb_queue_purge(&sk->sk_write_queue);
	35	nfc_rawsock(sk)->tx_work_scheduled = false;
	36	spin_unlock_bh(&sk->sk_write_queue.lock);
	37	}
	38
	39	static void rawsock_report_error(struct sock *sk, int err)
	40	{
	41	nfc_dbg("sk=%p err=%d", sk, err);
	42
	43	sk->sk_shutdown = SHUTDOWN_MASK;
	44	sk->sk_err = -err;
	45	sk->sk_error_report(sk);
	46
	47	rawsock_write_queue_purge(sk);
	48	}
	49
	50	static int rawsock_release(struct socket *sock)
	51	{
	52	struct sock *sk = sock->sk;
	53
	54	nfc_dbg("sock=%p", sock);
	55
	56	sock_orphan(sk);
	57	sock_put(sk);
	58
	59	return 0;
	60	}
	61
	62	static int rawsock_connect(struct socket sock, struct sockaddr _addr,
	63	int len, int flags)
	64	{
65	struct sock *sk = sock->sk;
66	struct sockaddr_nfc addr = (struct sockaddr_nfc )_addr;
67	struct nfc_dev *dev;
68	int rc = 0;
69
70	nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags);
71
72	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
73	addr->sa_family != AF_NFC)
74	return -EINVAL;
75
76	nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx,
77	addr->target_idx, addr->nfc_protocol);
78
79	lock_sock(sk);
80
81	if (sock->state == SS_CONNECTED) {
82	rc = -EISCONN;
83	goto error;
84	}
85
86	dev = nfc_get_device(addr->dev_idx);
87	if (!dev) {
88	rc = -ENODEV;
89	goto error;
90	}
91
92	if (addr->target_idx > dev->target_idx - 1 \|\|
93	addr->target_idx < dev->target_idx - dev->n_targets) {
94	rc = -EINVAL;
95	goto error;
96	}
97
98	if (addr->target_idx > dev->target_idx - 1 \|\|
99	addr->target_idx < dev->target_idx - dev->n_targets) {
100	rc = -EINVAL;
101	goto error;
102	}
103
104	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
105	if (rc)
106	goto put_dev;
107
108	nfc_rawsock(sk)->dev = dev;
109	nfc_rawsock(sk)->target_idx = addr->target_idx;
110	sock->state = SS_CONNECTED;
111	sk->sk_state = TCP_ESTABLISHED;
112	sk->sk_state_change(sk);
113
114	release_sock(sk);
115	return 0;
116
117	put_dev:
118	nfc_put_device(dev);
119	error:
120	release_sock(sk);
121	return rc;
122	}
123
124	static int rawsock_add_header(struct sk_buff *skb)
125	{
126
127	if (skb_cow_head(skb, 1))
128	return -ENOMEM;
129
130	*skb_push(skb, 1) = 0;
131
132	return 0;
133	}
134
135	static void rawsock_data_exchange_complete(void context, struct sk_buff skb,
136	int err)
137	{
138	struct sock sk = (struct sock ) context;
139
140	BUG_ON(in_irq());
141
142	nfc_dbg("sk=%p err=%d", sk, err);
143
144	if (err)
145	goto error;
146
147	err = rawsock_add_header(skb);
148	if (err)
149	goto error;
150
151	err = sock_queue_rcv_skb(sk, skb);
152	if (err)
153	goto error;
154
155	spin_lock_bh(&sk->sk_write_queue.lock);
156	if (!skb_queue_empty(&sk->sk_write_queue))
157	schedule_work(&nfc_rawsock(sk)->tx_work);
158	else
159	nfc_rawsock(sk)->tx_work_scheduled = false;
160	spin_unlock_bh(&sk->sk_write_queue.lock);
161
162	sock_put(sk);
163	return;
164
165	error:
166	rawsock_report_error(sk, err);
167	sock_put(sk);
168	}
169
170	static void rawsock_tx_work(struct work_struct *work)
171	{
172	struct sock *sk = to_rawsock_sk(work);
173	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
174	u32 target_idx = nfc_rawsock(sk)->target_idx;
175	struct sk_buff *skb;
176	int rc;
177
178	nfc_dbg("sk=%p target_idx=%u", sk, target_idx);
179
180	if (sk->sk_shutdown & SEND_SHUTDOWN) {
181	rawsock_write_queue_purge(sk);
182	return;
183	}
184
185	skb = skb_dequeue(&sk->sk_write_queue);
186
187	sock_hold(sk);
188	rc = nfc_data_exchange(dev, target_idx, skb,
189	rawsock_data_exchange_complete, sk);
190	if (rc) {
191	rawsock_report_error(sk, rc);
192	sock_put(sk);
193	}
194	}
195
196	static int rawsock_sendmsg(struct kiocb iocb, struct socket sock,
197	struct msghdr *msg, size_t len)
198	{
199	struct sock *sk = sock->sk;
200	struct sk_buff *skb;
201	int rc;
202
203	nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len);
204
205	if (msg->msg_namelen)
206	return -EOPNOTSUPP;
207
208	if (sock->state != SS_CONNECTED)
209	return -ENOTCONN;
210
211	skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT,
212	&rc);
213	if (!skb)
214	return rc;
215
216	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
217	if (rc < 0) {
218	kfree_skb(skb);
219	return rc;
220	}
221
222	spin_lock_bh(&sk->sk_write_queue.lock);
223	__skb_queue_tail(&sk->sk_write_queue, skb);
224	if (!nfc_rawsock(sk)->tx_work_scheduled) {
225	schedule_work(&nfc_rawsock(sk)->tx_work);
226	nfc_rawsock(sk)->tx_work_scheduled = true;
227	}
228	spin_unlock_bh(&sk->sk_write_queue.lock);
229
230	return len;
231	}
232
233	static int rawsock_recvmsg(struct kiocb iocb, struct socket sock,
234	struct msghdr *msg, size_t len, int flags)
235	{
236	int noblock = flags & MSG_DONTWAIT;
237	struct sock *sk = sock->sk;
238	struct sk_buff *skb;
239	int copied;
240	int rc;
241
242	nfc_dbg("sock=%p sk=%p len=%zu flags=%d", sock, sk, len, flags);
243
244	skb = skb_recv_datagram(sk, flags, noblock, &rc);
245	if (!skb)
246	return rc;
247
248	msg->msg_namelen = 0;
249
250	copied = skb->len;
251	if (len < copied) {
252	msg->msg_flags \|= MSG_TRUNC;
253	copied = len;
254	}
255
256	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
257
258	skb_free_datagram(sk, skb);
259
260	return rc ? : copied;
261	}
262
263
264	static const struct proto_ops rawsock_ops = {
265	.family = PF_NFC,
266	.owner = THIS_MODULE,
267	.release = rawsock_release,
268	.bind = sock_no_bind,
269	.connect = rawsock_connect,
270	.socketpair = sock_no_socketpair,
271	.accept = sock_no_accept,
272	.getname = sock_no_getname,
273	.poll = datagram_poll,
274	.ioctl = sock_no_ioctl,
275	.listen = sock_no_listen,
276	.shutdown = sock_no_shutdown,
277	.setsockopt = sock_no_setsockopt,
278	.getsockopt = sock_no_getsockopt,
279	.sendmsg = rawsock_sendmsg,
280	.recvmsg = rawsock_recvmsg,
281	.mmap = sock_no_mmap,
282	};
283
284	static void rawsock_destruct(struct sock *sk)
285	{
286	nfc_dbg("sk=%p", sk);
287
288	if (sk->sk_state == TCP_ESTABLISHED) {
289	nfc_deactivate_target(nfc_rawsock(sk)->dev,
290	nfc_rawsock(sk)->target_idx);
291	nfc_put_device(nfc_rawsock(sk)->dev);
292	}
293
294	skb_queue_purge(&sk->sk_receive_queue);
295
296	if (!sock_flag(sk, SOCK_DEAD)) {
297	nfc_err("Freeing alive NFC raw socket %p", sk);
298	return;
299	}
300	}
301
302	static int rawsock_create(struct net net, struct socket sock,
303	const struct nfc_protocol *nfc_proto)
304	{
305	struct sock *sk;
306
307	nfc_dbg("sock=%p", sock);
308
309	if (sock->type != SOCK_SEQPACKET)
310	return -ESOCKTNOSUPPORT;
311
312	sock->ops = &rawsock_ops;
313
314	sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto);
315	if (!sk)
316	return -ENOMEM;
317
318	sock_init_data(sock, sk);
319	sk->sk_protocol = nfc_proto->id;
320	sk->sk_destruct = rawsock_destruct;
321	sock->state = SS_UNCONNECTED;
322
323	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
324	nfc_rawsock(sk)->tx_work_scheduled = false;
325
326	return 0;
327	}
328
329	static struct proto rawsock_proto = {
330	.name = "NFC_RAW",
331	.owner = THIS_MODULE,
332	.obj_size = sizeof(struct nfc_rawsock),
333	};
334
335	static const struct nfc_protocol rawsock_nfc_proto = {
336	.id = NFC_SOCKPROTO_RAW,
337	.proto = &rawsock_proto,
338	.owner = THIS_MODULE,
339	.create = rawsock_create
340	};
341
342	int __init rawsock_init(void)
343	{
344	int rc;
345
346	rc = nfc_proto_register(&rawsock_nfc_proto);
347
348	return rc;
349	}
350
351	void rawsock_exit(void)
352	{
353	nfc_proto_unregister(&rawsock_nfc_proto);
354	}