2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
5 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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.
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.
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.
24 #include <net/tcp_states.h>
25 #include <linux/nfc.h>
29 static void rawsock_write_queue_purge(struct sock *sk)
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);
39 static void rawsock_report_error(struct sock *sk, int err)
41 nfc_dbg("sk=%p err=%d", sk, err);
43 sk->sk_shutdown = SHUTDOWN_MASK;
45 sk->sk_error_report(sk);
47 rawsock_write_queue_purge(sk);
50 static int rawsock_release(struct socket *sock)
52 struct sock *sk = sock->sk;
54 nfc_dbg("sock=%p", sock);
62 static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
65 struct sock *sk = sock->sk;
66 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
70 nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags);
72 if (!addr || len < sizeof(struct sockaddr_nfc) ||
73 addr->sa_family != AF_NFC)
76 nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx,
77 addr->target_idx, addr->nfc_protocol);
81 if (sock->state == SS_CONNECTED) {
86 dev = nfc_get_device(addr->dev_idx);
92 if (addr->target_idx > dev->target_idx - 1 ||
93 addr->target_idx < dev->target_idx - dev->n_targets) {
98 if (addr->target_idx > dev->target_idx - 1 ||
99 addr->target_idx < dev->target_idx - dev->n_targets) {
104 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
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);
124 static int rawsock_add_header(struct sk_buff *skb)
126 *skb_push(skb, NFC_HEADER_SIZE) = 0;
131 static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
134 struct sock *sk = (struct sock *) context;
138 nfc_dbg("sk=%p err=%d", sk, err);
143 err = rawsock_add_header(skb);
147 err = sock_queue_rcv_skb(sk, skb);
151 spin_lock_bh(&sk->sk_write_queue.lock);
152 if (!skb_queue_empty(&sk->sk_write_queue))
153 schedule_work(&nfc_rawsock(sk)->tx_work);
155 nfc_rawsock(sk)->tx_work_scheduled = false;
156 spin_unlock_bh(&sk->sk_write_queue.lock);
162 rawsock_report_error(sk, err);
166 static void rawsock_tx_work(struct work_struct *work)
168 struct sock *sk = to_rawsock_sk(work);
169 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
170 u32 target_idx = nfc_rawsock(sk)->target_idx;
174 nfc_dbg("sk=%p target_idx=%u", sk, target_idx);
176 if (sk->sk_shutdown & SEND_SHUTDOWN) {
177 rawsock_write_queue_purge(sk);
181 skb = skb_dequeue(&sk->sk_write_queue);
184 rc = nfc_data_exchange(dev, target_idx, skb,
185 rawsock_data_exchange_complete, sk);
187 rawsock_report_error(sk, rc);
192 static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
193 struct msghdr *msg, size_t len)
195 struct sock *sk = sock->sk;
196 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
200 nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len);
202 if (msg->msg_namelen)
205 if (sock->state != SS_CONNECTED)
208 skb = sock_alloc_send_skb(sk, len + dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE,
209 msg->msg_flags & MSG_DONTWAIT, &rc);
213 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
215 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
221 spin_lock_bh(&sk->sk_write_queue.lock);
222 __skb_queue_tail(&sk->sk_write_queue, skb);
223 if (!nfc_rawsock(sk)->tx_work_scheduled) {
224 schedule_work(&nfc_rawsock(sk)->tx_work);
225 nfc_rawsock(sk)->tx_work_scheduled = true;
227 spin_unlock_bh(&sk->sk_write_queue.lock);
232 static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
233 struct msghdr *msg, size_t len, int flags)
235 int noblock = flags & MSG_DONTWAIT;
236 struct sock *sk = sock->sk;
241 nfc_dbg("sock=%p sk=%p len=%zu flags=%d", sock, sk, len, flags);
243 skb = skb_recv_datagram(sk, flags, noblock, &rc);
247 msg->msg_namelen = 0;
251 msg->msg_flags |= MSG_TRUNC;
255 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
257 skb_free_datagram(sk, skb);
259 return rc ? : copied;
263 static const struct proto_ops rawsock_ops = {
265 .owner = THIS_MODULE,
266 .release = rawsock_release,
267 .bind = sock_no_bind,
268 .connect = rawsock_connect,
269 .socketpair = sock_no_socketpair,
270 .accept = sock_no_accept,
271 .getname = sock_no_getname,
272 .poll = datagram_poll,
273 .ioctl = sock_no_ioctl,
274 .listen = sock_no_listen,
275 .shutdown = sock_no_shutdown,
276 .setsockopt = sock_no_setsockopt,
277 .getsockopt = sock_no_getsockopt,
278 .sendmsg = rawsock_sendmsg,
279 .recvmsg = rawsock_recvmsg,
280 .mmap = sock_no_mmap,
283 static void rawsock_destruct(struct sock *sk)
285 nfc_dbg("sk=%p", sk);
287 if (sk->sk_state == TCP_ESTABLISHED) {
288 nfc_deactivate_target(nfc_rawsock(sk)->dev,
289 nfc_rawsock(sk)->target_idx);
290 nfc_put_device(nfc_rawsock(sk)->dev);
293 skb_queue_purge(&sk->sk_receive_queue);
295 if (!sock_flag(sk, SOCK_DEAD)) {
296 nfc_err("Freeing alive NFC raw socket %p", sk);
301 static int rawsock_create(struct net *net, struct socket *sock,
302 const struct nfc_protocol *nfc_proto)
306 nfc_dbg("sock=%p", sock);
308 if (sock->type != SOCK_SEQPACKET)
309 return -ESOCKTNOSUPPORT;
311 sock->ops = &rawsock_ops;
313 sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto);
317 sock_init_data(sock, sk);
318 sk->sk_protocol = nfc_proto->id;
319 sk->sk_destruct = rawsock_destruct;
320 sock->state = SS_UNCONNECTED;
322 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
323 nfc_rawsock(sk)->tx_work_scheduled = false;
328 static struct proto rawsock_proto = {
330 .owner = THIS_MODULE,
331 .obj_size = sizeof(struct nfc_rawsock),
334 static const struct nfc_protocol rawsock_nfc_proto = {
335 .id = NFC_SOCKPROTO_RAW,
336 .proto = &rawsock_proto,
337 .owner = THIS_MODULE,
338 .create = rawsock_create
341 int __init rawsock_init(void)
345 rc = nfc_proto_register(&rawsock_nfc_proto);
350 void rawsock_exit(void)
352 nfc_proto_unregister(&rawsock_nfc_proto);