forked from mirrors/linux
NFC: add the NFC socket raw protocol
This socket protocol is used to perform data exchange with NFC targets. Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org> Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Lauro Ramos Venancio
John W. Linville
parent
c7fe3b52c1
commit
23b7869c0f
5 changed files with 388 additions and 2 deletions
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@ -24,6 +24,9 @@
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#ifndef __LINUX_NFC_H
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#define __LINUX_NFC_H
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#include <linux/types.h>
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#include <linux/socket.h>
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#define NFC_GENL_NAME "nfc"
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#define NFC_GENL_VERSION 1
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@ -109,7 +112,15 @@ enum nfc_attrs {
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#define NFC_PROTO_ISO14443_MASK (1 << NFC_PROTO_ISO14443)
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#define NFC_PROTO_NFC_DEP_MASK (1 << NFC_PROTO_NFC_DEP)
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struct sockaddr_nfc {
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sa_family_t sa_family;
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__u32 dev_idx;
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__u32 target_idx;
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__u32 nfc_protocol;
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};
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/* NFC socket protocols */
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#define NFC_SOCKPROTO_MAX 0
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#define NFC_SOCKPROTO_RAW 0
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#define NFC_SOCKPROTO_MAX 1
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#endif /*__LINUX_NFC_H */
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@ -4,4 +4,4 @@
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obj-$(CONFIG_NFC) += nfc.o
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nfc-objs := core.o netlink.o af_nfc.o
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nfc-objs := core.o netlink.o af_nfc.o rawsock.o
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@ -432,6 +432,10 @@ static int __init nfc_init(void)
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/* the first generation must not be 0 */
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nfc_devlist_generation = 1;
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rc = rawsock_init();
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if (rc)
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goto err_rawsock;
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rc = af_nfc_init();
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if (rc)
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goto err_af_nfc;
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@ -439,6 +443,8 @@ static int __init nfc_init(void)
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return 0;
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err_af_nfc:
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rawsock_exit();
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err_rawsock:
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nfc_genl_exit();
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err_genl:
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class_unregister(&nfc_class);
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@ -448,6 +454,7 @@ static int __init nfc_init(void)
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static void __exit nfc_exit(void)
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{
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af_nfc_exit();
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rawsock_exit();
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nfc_genl_exit();
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class_unregister(&nfc_class);
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}
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@ -42,6 +42,20 @@ struct nfc_protocol {
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const struct nfc_protocol *nfc_proto);
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};
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struct nfc_rawsock {
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struct sock sk;
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struct nfc_dev *dev;
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u32 target_idx;
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struct work_struct tx_work;
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bool tx_work_scheduled;
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};
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#define nfc_rawsock(sk) ((struct nfc_rawsock *) sk)
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#define to_rawsock_sk(_tx_work) \
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((struct sock *) container_of(_tx_work, struct nfc_rawsock, tx_work))
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int __init rawsock_init(void);
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void rawsock_exit(void);
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int __init af_nfc_init(void);
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void af_nfc_exit(void);
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int nfc_proto_register(const struct nfc_protocol *nfc_proto);
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354
net/nfc/rawsock.c
Normal file
354
net/nfc/rawsock.c
Normal file
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@ -0,0 +1,354 @@
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/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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*
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* Authors:
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <net/tcp_states.h>
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#include <linux/nfc.h>
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#include "nfc.h"
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static void rawsock_write_queue_purge(struct sock *sk)
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{
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nfc_dbg("sk=%p", sk);
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spin_lock_bh(&sk->sk_write_queue.lock);
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__skb_queue_purge(&sk->sk_write_queue);
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nfc_rawsock(sk)->tx_work_scheduled = false;
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spin_unlock_bh(&sk->sk_write_queue.lock);
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}
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static void rawsock_report_error(struct sock *sk, int err)
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{
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nfc_dbg("sk=%p err=%d", sk, err);
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sk->sk_shutdown = SHUTDOWN_MASK;
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sk->sk_err = -err;
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sk->sk_error_report(sk);
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rawsock_write_queue_purge(sk);
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}
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static int rawsock_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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nfc_dbg("sock=%p", sock);
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sock_orphan(sk);
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sock_put(sk);
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return 0;
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}
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static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
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int len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
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struct nfc_dev *dev;
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int rc = 0;
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nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags);
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if (!addr || len < sizeof(struct sockaddr_nfc) ||
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addr->sa_family != AF_NFC)
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return -EINVAL;
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nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx,
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addr->target_idx, addr->nfc_protocol);
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lock_sock(sk);
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if (sock->state == SS_CONNECTED) {
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rc = -EISCONN;
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goto error;
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}
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dev = nfc_get_device(addr->dev_idx);
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if (!dev) {
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rc = -ENODEV;
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goto error;
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}
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if (addr->target_idx > dev->target_idx - 1 ||
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addr->target_idx < dev->target_idx - dev->n_targets) {
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rc = -EINVAL;
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goto error;
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}
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if (addr->target_idx > dev->target_idx - 1 ||
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addr->target_idx < dev->target_idx - dev->n_targets) {
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rc = -EINVAL;
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goto error;
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}
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rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
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if (rc)
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goto put_dev;
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nfc_rawsock(sk)->dev = dev;
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nfc_rawsock(sk)->target_idx = addr->target_idx;
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sock->state = SS_CONNECTED;
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sk->sk_state = TCP_ESTABLISHED;
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sk->sk_state_change(sk);
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release_sock(sk);
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return 0;
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put_dev:
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nfc_put_device(dev);
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error:
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release_sock(sk);
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return rc;
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}
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static int rawsock_add_header(struct sk_buff *skb)
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{
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if (skb_cow_head(skb, 1))
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return -ENOMEM;
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*skb_push(skb, 1) = 0;
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return 0;
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}
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static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
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int err)
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{
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struct sock *sk = (struct sock *) context;
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BUG_ON(in_irq());
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nfc_dbg("sk=%p err=%d", sk, err);
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if (err)
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goto error;
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err = rawsock_add_header(skb);
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if (err)
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goto error;
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err = sock_queue_rcv_skb(sk, skb);
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if (err)
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goto error;
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spin_lock_bh(&sk->sk_write_queue.lock);
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if (!skb_queue_empty(&sk->sk_write_queue))
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schedule_work(&nfc_rawsock(sk)->tx_work);
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else
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nfc_rawsock(sk)->tx_work_scheduled = false;
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spin_unlock_bh(&sk->sk_write_queue.lock);
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sock_put(sk);
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return;
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error:
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rawsock_report_error(sk, err);
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sock_put(sk);
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}
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static void rawsock_tx_work(struct work_struct *work)
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{
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struct sock *sk = to_rawsock_sk(work);
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struct nfc_dev *dev = nfc_rawsock(sk)->dev;
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u32 target_idx = nfc_rawsock(sk)->target_idx;
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struct sk_buff *skb;
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int rc;
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nfc_dbg("sk=%p target_idx=%u", sk, target_idx);
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if (sk->sk_shutdown & SEND_SHUTDOWN) {
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rawsock_write_queue_purge(sk);
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return;
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}
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skb = skb_dequeue(&sk->sk_write_queue);
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sock_hold(sk);
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rc = nfc_data_exchange(dev, target_idx, skb,
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rawsock_data_exchange_complete, sk);
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if (rc) {
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rawsock_report_error(sk, rc);
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sock_put(sk);
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}
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}
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static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int rc;
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nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len);
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if (msg->msg_namelen)
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return -EOPNOTSUPP;
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if (sock->state != SS_CONNECTED)
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return -ENOTCONN;
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skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT,
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&rc);
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if (!skb)
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return rc;
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rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
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if (rc < 0) {
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kfree_skb(skb);
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return rc;
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}
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spin_lock_bh(&sk->sk_write_queue.lock);
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__skb_queue_tail(&sk->sk_write_queue, skb);
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if (!nfc_rawsock(sk)->tx_work_scheduled) {
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schedule_work(&nfc_rawsock(sk)->tx_work);
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nfc_rawsock(sk)->tx_work_scheduled = true;
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}
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spin_unlock_bh(&sk->sk_write_queue.lock);
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return len;
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}
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static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len, int flags)
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{
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int noblock = flags & MSG_DONTWAIT;
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int copied;
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int rc;
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nfc_dbg("sock=%p sk=%p len=%zu flags=%d", sock, sk, len, flags);
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skb = skb_recv_datagram(sk, flags, noblock, &rc);
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if (!skb)
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return rc;
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msg->msg_namelen = 0;
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copied = skb->len;
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if (len < copied) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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skb_free_datagram(sk, skb);
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return rc ? : copied;
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}
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static const struct proto_ops rawsock_ops = {
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.family = PF_NFC,
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.owner = THIS_MODULE,
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.release = rawsock_release,
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.bind = sock_no_bind,
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.connect = rawsock_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = sock_no_getname,
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.poll = datagram_poll,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = sock_no_setsockopt,
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.getsockopt = sock_no_getsockopt,
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.sendmsg = rawsock_sendmsg,
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.recvmsg = rawsock_recvmsg,
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.mmap = sock_no_mmap,
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};
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static void rawsock_destruct(struct sock *sk)
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{
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nfc_dbg("sk=%p", sk);
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if (sk->sk_state == TCP_ESTABLISHED) {
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nfc_deactivate_target(nfc_rawsock(sk)->dev,
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nfc_rawsock(sk)->target_idx);
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nfc_put_device(nfc_rawsock(sk)->dev);
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}
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skb_queue_purge(&sk->sk_receive_queue);
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if (!sock_flag(sk, SOCK_DEAD)) {
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nfc_err("Freeing alive NFC raw socket %p", sk);
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return;
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}
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}
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static int rawsock_create(struct net *net, struct socket *sock,
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const struct nfc_protocol *nfc_proto)
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{
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struct sock *sk;
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nfc_dbg("sock=%p", sock);
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if (sock->type != SOCK_SEQPACKET)
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return -ESOCKTNOSUPPORT;
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sock->ops = &rawsock_ops;
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sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto);
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if (!sk)
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return -ENOMEM;
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sock_init_data(sock, sk);
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sk->sk_protocol = nfc_proto->id;
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sk->sk_destruct = rawsock_destruct;
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sock->state = SS_UNCONNECTED;
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INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
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nfc_rawsock(sk)->tx_work_scheduled = false;
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return 0;
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}
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static struct proto rawsock_proto = {
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.name = "NFC_RAW",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct nfc_rawsock),
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};
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static const struct nfc_protocol rawsock_nfc_proto = {
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.id = NFC_SOCKPROTO_RAW,
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.proto = &rawsock_proto,
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.owner = THIS_MODULE,
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.create = rawsock_create
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};
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int __init rawsock_init(void)
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{
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int rc;
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rc = nfc_proto_register(&rawsock_nfc_proto);
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return rc;
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}
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void rawsock_exit(void)
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{
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nfc_proto_unregister(&rawsock_nfc_proto);
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}
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