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 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
26 #include <net/tcp_states.h>
27 #include <linux/nfc.h>
28 #include <linux/export.h>
32 static void rawsock_write_queue_purge(struct sock *sk)
34 pr_debug("sk=%p\n", sk);
36 spin_lock_bh(&sk->sk_write_queue.lock);
37 __skb_queue_purge(&sk->sk_write_queue);
38 nfc_rawsock(sk)->tx_work_scheduled = false;
39 spin_unlock_bh(&sk->sk_write_queue.lock);
42 static void rawsock_report_error(struct sock *sk, int err)
44 pr_debug("sk=%p err=%d\n", sk, err);
46 sk->sk_shutdown = SHUTDOWN_MASK;
48 sk->sk_error_report(sk);
50 rawsock_write_queue_purge(sk);
53 static int rawsock_release(struct socket *sock)
55 struct sock *sk = sock->sk;
57 pr_debug("sock=%p\n", sock);
65 static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
68 struct sock *sk = sock->sk;
69 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
73 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
75 if (!addr || len < sizeof(struct sockaddr_nfc) ||
76 addr->sa_family != AF_NFC)
79 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
80 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
84 if (sock->state == SS_CONNECTED) {
89 dev = nfc_get_device(addr->dev_idx);
95 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
99 nfc_rawsock(sk)->dev = dev;
100 nfc_rawsock(sk)->target_idx = addr->target_idx;
101 sock->state = SS_CONNECTED;
102 sk->sk_state = TCP_ESTABLISHED;
103 sk->sk_state_change(sk);
115 static int rawsock_add_header(struct sk_buff *skb)
117 *skb_push(skb, NFC_HEADER_SIZE) = 0;
122 static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
125 struct sock *sk = (struct sock *) context;
129 pr_debug("sk=%p err=%d\n", sk, err);
134 err = rawsock_add_header(skb);
138 err = sock_queue_rcv_skb(sk, skb);
142 spin_lock_bh(&sk->sk_write_queue.lock);
143 if (!skb_queue_empty(&sk->sk_write_queue))
144 schedule_work(&nfc_rawsock(sk)->tx_work);
146 nfc_rawsock(sk)->tx_work_scheduled = false;
147 spin_unlock_bh(&sk->sk_write_queue.lock);
153 rawsock_report_error(sk, err);
157 static void rawsock_tx_work(struct work_struct *work)
159 struct sock *sk = to_rawsock_sk(work);
160 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
161 u32 target_idx = nfc_rawsock(sk)->target_idx;
165 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
167 if (sk->sk_shutdown & SEND_SHUTDOWN) {
168 rawsock_write_queue_purge(sk);
172 skb = skb_dequeue(&sk->sk_write_queue);
175 rc = nfc_data_exchange(dev, target_idx, skb,
176 rawsock_data_exchange_complete, sk);
178 rawsock_report_error(sk, rc);
183 static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
184 struct msghdr *msg, size_t len)
186 struct sock *sk = sock->sk;
187 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
191 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
193 if (msg->msg_namelen)
196 if (sock->state != SS_CONNECTED)
199 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
203 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
209 spin_lock_bh(&sk->sk_write_queue.lock);
210 __skb_queue_tail(&sk->sk_write_queue, skb);
211 if (!nfc_rawsock(sk)->tx_work_scheduled) {
212 schedule_work(&nfc_rawsock(sk)->tx_work);
213 nfc_rawsock(sk)->tx_work_scheduled = true;
215 spin_unlock_bh(&sk->sk_write_queue.lock);
220 static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
221 struct msghdr *msg, size_t len, int flags)
223 int noblock = flags & MSG_DONTWAIT;
224 struct sock *sk = sock->sk;
229 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
231 skb = skb_recv_datagram(sk, flags, noblock, &rc);
235 msg->msg_namelen = 0;
239 msg->msg_flags |= MSG_TRUNC;
243 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
245 skb_free_datagram(sk, skb);
247 return rc ? : copied;
251 static const struct proto_ops rawsock_ops = {
253 .owner = THIS_MODULE,
254 .release = rawsock_release,
255 .bind = sock_no_bind,
256 .connect = rawsock_connect,
257 .socketpair = sock_no_socketpair,
258 .accept = sock_no_accept,
259 .getname = sock_no_getname,
260 .poll = datagram_poll,
261 .ioctl = sock_no_ioctl,
262 .listen = sock_no_listen,
263 .shutdown = sock_no_shutdown,
264 .setsockopt = sock_no_setsockopt,
265 .getsockopt = sock_no_getsockopt,
266 .sendmsg = rawsock_sendmsg,
267 .recvmsg = rawsock_recvmsg,
268 .mmap = sock_no_mmap,
271 static void rawsock_destruct(struct sock *sk)
273 pr_debug("sk=%p\n", sk);
275 if (sk->sk_state == TCP_ESTABLISHED) {
276 nfc_deactivate_target(nfc_rawsock(sk)->dev,
277 nfc_rawsock(sk)->target_idx);
278 nfc_put_device(nfc_rawsock(sk)->dev);
281 skb_queue_purge(&sk->sk_receive_queue);
283 if (!sock_flag(sk, SOCK_DEAD)) {
284 pr_err("Freeing alive NFC raw socket %p\n", sk);
289 static int rawsock_create(struct net *net, struct socket *sock,
290 const struct nfc_protocol *nfc_proto)
294 pr_debug("sock=%p\n", sock);
296 if (sock->type != SOCK_SEQPACKET)
297 return -ESOCKTNOSUPPORT;
299 sock->ops = &rawsock_ops;
301 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
305 sock_init_data(sock, sk);
306 sk->sk_protocol = nfc_proto->id;
307 sk->sk_destruct = rawsock_destruct;
308 sock->state = SS_UNCONNECTED;
310 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
311 nfc_rawsock(sk)->tx_work_scheduled = false;
316 static struct proto rawsock_proto = {
318 .owner = THIS_MODULE,
319 .obj_size = sizeof(struct nfc_rawsock),
322 static const struct nfc_protocol rawsock_nfc_proto = {
323 .id = NFC_SOCKPROTO_RAW,
324 .proto = &rawsock_proto,
325 .owner = THIS_MODULE,
326 .create = rawsock_create
329 int __init rawsock_init(void)
333 rc = nfc_proto_register(&rawsock_nfc_proto);
338 void rawsock_exit(void)
340 nfc_proto_unregister(&rawsock_nfc_proto);