Return-path: Received: from mail-yx0-f174.google.com ([209.85.213.174]:39299 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755033Ab1FBVr0 (ORCPT ); Thu, 2 Jun 2011 17:47:26 -0400 Received: by yxs7 with SMTP id 7so528444yxs.19 for ; Thu, 02 Jun 2011 14:47:25 -0700 (PDT) From: Lauro Ramos Venancio To: "John W. Linville" Cc: linux-wireless@vger.kernel.org, lauro.venancio@openbossa.org, marcio.macedo@openbossa.org, aloisio.almeida@openbossa.org, sameo@linux.intel.com, Waldemar.Rymarkiewicz@tieto.com Subject: [PATCH 4/6] NFC: add the NFC socket raw protocol Date: Thu, 2 Jun 2011 18:46:08 -0300 Message-Id: <1307051170-17374-5-git-send-email-lauro.venancio@openbossa.org> (sfid-20110602_234731_922490_10E021AD) In-Reply-To: <1307051170-17374-1-git-send-email-lauro.venancio@openbossa.org> References: <1307051170-17374-1-git-send-email-lauro.venancio@openbossa.org> Sender: linux-wireless-owner@vger.kernel.org List-ID: This socket protocol is used to perform data exchange with NFC targets. Signed-off-by: Lauro Ramos Venancio Signed-off-by: Aloisio Almeida Jr Signed-off-by: Samuel Ortiz --- include/linux/nfc.h | 13 ++- net/nfc/Makefile | 2 +- net/nfc/core.c | 7 + net/nfc/nfc.h | 14 ++ net/nfc/rawsock.c | 351 +++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 385 insertions(+), 2 deletions(-) create mode 100644 net/nfc/rawsock.c diff --git a/include/linux/nfc.h b/include/linux/nfc.h index 7361f80..a62e232 100644 --- a/include/linux/nfc.h +++ b/include/linux/nfc.h @@ -24,6 +24,9 @@ #ifndef __LINUX_NFC_H #define __LINUX_NFC_H +#include +#include + #define NFC_GENL_NAME "nfc" #define NFC_GENL_VERSION 1 @@ -119,7 +122,15 @@ enum nfc_target_attr { }; #define NFC_TARGET_ATTR_MAX (__NFC_TARGET_ATTR_AFTER_LAST - 1) +struct sockaddr_nfc { + sa_family_t sa_family; + __u32 dev_idx; + __u32 target_idx; + __u32 nfc_protocol; +}; + /* NFC socket protocols */ -#define NFC_SOCKPROTO_MAX 0 +#define NFC_SOCKPROTO_RAW 0 +#define NFC_SOCKPROTO_MAX 1 #endif /*__LINUX_NFC_H */ diff --git a/net/nfc/Makefile b/net/nfc/Makefile index c65add7..26996e0 100644 --- a/net/nfc/Makefile +++ b/net/nfc/Makefile @@ -4,6 +4,6 @@ obj-$(CONFIG_NFC) += nfc.o -nfc-objs := core.o netlink.o af_nfc.o +nfc-objs := core.o netlink.o af_nfc.o rawsock.o ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG diff --git a/net/nfc/core.c b/net/nfc/core.c index d4d2ecc..f045e0c 100644 --- a/net/nfc/core.c +++ b/net/nfc/core.c @@ -366,6 +366,10 @@ static int __init nfc_init(void) if (rc) goto err_genl; + rc = rawsock_init(); + if (rc) + goto err_rawsock; + rc = af_nfc_init(); if (rc) goto err_af_nfc; @@ -373,6 +377,8 @@ static int __init nfc_init(void) return 0; err_af_nfc: + rawsock_exit(); +err_rawsock: nfc_genl_exit(); err_genl: class_unregister(&nfc_class); @@ -383,6 +389,7 @@ err: static void __exit nfc_exit(void) { af_nfc_exit(); + rawsock_exit(); nfc_genl_exit(); class_unregister(&nfc_class); } diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h index 76b891f..1a86641 100644 --- a/net/nfc/nfc.h +++ b/net/nfc/nfc.h @@ -35,6 +35,20 @@ struct nfc_protocol { 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); void af_nfc_exit(void); int nfc_proto_register(const struct nfc_protocol *nfc_proto); diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c new file mode 100644 index 0000000..87ec5e2 --- /dev/null +++ b/net/nfc/rawsock.c @@ -0,0 +1,351 @@ +/* + * Copyright (C) 2011 Instituto Nokia de Tecnologia + * + * Authors: + * Aloisio Almeida Jr + * Lauro Ramos Venancio + * + * 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 +#include + +#include "nfc.h" + +static void rawsock_write_queue_purge(struct sock *sk) +{ + pr_debug("%s\n", __func__); + + 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) +{ + pr_debug("%s\n", __func__); + + 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; + + pr_debug("%s\n", __func__); + + 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; + + pr_debug("%s\n", __func__); + + if (!addr || len < sizeof(struct sockaddr_nfc) || + addr->sa_family != AF_NFC) + return -EINVAL; + + 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()); + + 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; + + 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; + + pr_debug("%s\n", __func__); + + 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; + + pr_debug("%s\n", __func__); + + 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) +{ + pr_debug("%s\n", __func__); + + 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)) { + printk(KERN_ERR "Freeing alive NFC raw socket %p\n", sk); + return; + } +} + +static int rawsock_create(struct net *net, struct socket *sock, + const struct nfc_protocol *nfc_proto) +{ + struct sock *sk; + + pr_debug("%s\n", __func__); + + 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; + + pr_debug("%s\n", __func__); + + rc = nfc_proto_register(&rawsock_nfc_proto); + + return rc; +} + +void rawsock_exit(void) +{ + pr_debug("%s\n", __func__); + + nfc_proto_unregister(&rawsock_nfc_proto); +} -- 1.7.1