Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 23b7869c authored by Lauro Ramos Venancio's avatar Lauro Ramos Venancio Committed by John W. Linville
Browse files

NFC: add the NFC socket raw protocol 



This socket protocol is used to perform data exchange with NFC
targets.

Signed-off-by: default avatarLauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: default avatarAloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent c7fe3b52

include/linux/nfc.h

+12 −1
Original line number Original line Diff line number Diff line
@@ -24,6 +24,9 @@ 
#ifndef __LINUX_NFC_H

#ifndef __LINUX_NFC_H

#define __LINUX_NFC_H

#define __LINUX_NFC_H





#include <linux/types.h>

#include <linux/socket.h>



#define NFC_GENL_NAME "nfc"

#define NFC_GENL_NAME "nfc"

#define NFC_GENL_VERSION 1

#define NFC_GENL_VERSION 1
@@ -109,7 +112,15 @@ enum nfc_attrs { 
#define NFC_PROTO_ISO14443_MASK	(1 << NFC_PROTO_ISO14443)

#define NFC_PROTO_ISO14443_MASK	(1 << NFC_PROTO_ISO14443)

#define NFC_PROTO_NFC_DEP_MASK	(1 << NFC_PROTO_NFC_DEP)

#define NFC_PROTO_NFC_DEP_MASK	(1 << NFC_PROTO_NFC_DEP)





struct sockaddr_nfc {

	sa_family_t sa_family;

	__u32 dev_idx;

	__u32 target_idx;

	__u32 nfc_protocol;

};



/* NFC socket protocols */

/* NFC socket protocols */

#define NFC_SOCKPROTO_MAX	0

#define NFC_SOCKPROTO_RAW	0

#define NFC_SOCKPROTO_MAX	1





#endif /*__LINUX_NFC_H */
 
#endif /*__LINUX_NFC_H */

net/nfc/Makefile

+1 −1
Original line number Original line Diff line number Diff line
@@ -4,4 +4,4 @@ 




obj-$(CONFIG_NFC) += nfc.o

obj-$(CONFIG_NFC) += nfc.o





nfc-objs := core.o netlink.o af_nfc.o
 
nfc-objs := core.o netlink.o af_nfc.o rawsock.o

net/nfc/core.c

+7 −0
Original line number Original line Diff line number Diff line
@@ -432,6 +432,10 @@ static int __init nfc_init(void) 
	/* the first generation must not be 0 */

	/* the first generation must not be 0 */

	nfc_devlist_generation = 1;

	nfc_devlist_generation = 1;





	rc = rawsock_init();

	if (rc)

		goto err_rawsock;



	rc = af_nfc_init();

	rc = af_nfc_init();

	if (rc)

	if (rc)

		goto err_af_nfc;

		goto err_af_nfc;
@@ -439,6 +443,8 @@ static int __init nfc_init(void) 
	return 0;

	return 0;





err_af_nfc:

err_af_nfc:

	rawsock_exit();

err_rawsock:

	nfc_genl_exit();

	nfc_genl_exit();

err_genl:

err_genl:

	class_unregister(&nfc_class);

	class_unregister(&nfc_class);
@@ -448,6 +454,7 @@ err_genl: 
static void __exit nfc_exit(void)

static void __exit nfc_exit(void)

{

{

	af_nfc_exit();

	af_nfc_exit();

	rawsock_exit();

	nfc_genl_exit();

	nfc_genl_exit();

	class_unregister(&nfc_class);

	class_unregister(&nfc_class);

}

}

net/nfc/nfc.h

+14 −0
Original line number Original line Diff line number Diff line
@@ -42,6 +42,20 @@ struct nfc_protocol { 
			const struct nfc_protocol *nfc_proto);

			const struct nfc_protocol *nfc_proto);

};

};





struct nfc_rawsock {

	struct sock sk;

	struct nfc_dev *dev;

	u32 target_idx;

	struct work_struct tx_work;

	bool tx_work_scheduled;

};

#define nfc_rawsock(sk) ((struct nfc_rawsock *) sk)

#define to_rawsock_sk(_tx_work) \

	((struct sock *) container_of(_tx_work, struct nfc_rawsock, tx_work))



int __init rawsock_init(void);

void rawsock_exit(void);



int __init af_nfc_init(void);

int __init af_nfc_init(void);

void af_nfc_exit(void);

void af_nfc_exit(void);

int nfc_proto_register(const struct nfc_protocol *nfc_proto);

int nfc_proto_register(const struct nfc_protocol *nfc_proto);

net/nfc/rawsock.c

0 → 100644
+354 −0
Original line number Original line Diff line number Diff line 
/*

 * 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);

}