blob: c27a6e86cae459f0f70c2c4875614edac3518f98 [file] [log] [blame]
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -03001/*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
7 *
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.
12 *
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.
17 *
18 * You should have received a copy of the GNU General Public License
Jeff Kirsher98b32de2013-12-06 08:56:16 -080019 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030020 */
21
Samuel Ortiz52858b52011-12-14 16:43:05 +010022#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
Joe Perchesed1e0ad2011-11-29 11:37:32 -080023
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030024#include <net/tcp_states.h>
25#include <linux/nfc.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040026#include <linux/export.h>
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030027
28#include "nfc.h"
29
30static void rawsock_write_queue_purge(struct sock *sk)
31{
Joe Perches20c239c2011-11-29 11:37:33 -080032 pr_debug("sk=%p\n", sk);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030033
34 spin_lock_bh(&sk->sk_write_queue.lock);
35 __skb_queue_purge(&sk->sk_write_queue);
36 nfc_rawsock(sk)->tx_work_scheduled = false;
37 spin_unlock_bh(&sk->sk_write_queue.lock);
38}
39
40static void rawsock_report_error(struct sock *sk, int err)
41{
Joe Perches20c239c2011-11-29 11:37:33 -080042 pr_debug("sk=%p err=%d\n", sk, err);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030043
44 sk->sk_shutdown = SHUTDOWN_MASK;
45 sk->sk_err = -err;
46 sk->sk_error_report(sk);
47
48 rawsock_write_queue_purge(sk);
49}
50
51static int rawsock_release(struct socket *sock)
52{
53 struct sock *sk = sock->sk;
54
Eric Dumazet03e934f2012-06-12 00:47:58 +020055 pr_debug("sock=%p sk=%p\n", sock, sk);
56
57 if (!sk)
58 return 0;
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030059
60 sock_orphan(sk);
61 sock_put(sk);
62
63 return 0;
64}
65
66static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +010067 int len, int flags)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030068{
69 struct sock *sk = sock->sk;
70 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
71 struct nfc_dev *dev;
72 int rc = 0;
73
Joe Perches20c239c2011-11-29 11:37:33 -080074 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030075
76 if (!addr || len < sizeof(struct sockaddr_nfc) ||
Samuel Ortiz0a40acb2012-03-05 01:03:53 +010077 addr->sa_family != AF_NFC)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030078 return -EINVAL;
79
Joe Perches20c239c2011-11-29 11:37:33 -080080 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
81 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -030082
83 lock_sock(sk);
84
85 if (sock->state == SS_CONNECTED) {
86 rc = -EISCONN;
87 goto error;
88 }
89
90 dev = nfc_get_device(addr->dev_idx);
91 if (!dev) {
92 rc = -ENODEV;
93 goto error;
94 }
95
Eric Lapuyade01ae0ee2012-04-10 19:43:10 +020096 if (addr->target_idx > dev->target_next_idx - 1 ||
97 addr->target_idx < dev->target_next_idx - dev->n_targets) {
Samuel Ortizc4fbb652012-04-10 19:43:09 +020098 rc = -EINVAL;
99 goto error;
100 }
101
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300102 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
103 if (rc)
104 goto put_dev;
105
106 nfc_rawsock(sk)->dev = dev;
107 nfc_rawsock(sk)->target_idx = addr->target_idx;
108 sock->state = SS_CONNECTED;
109 sk->sk_state = TCP_ESTABLISHED;
110 sk->sk_state_change(sk);
111
112 release_sock(sk);
113 return 0;
114
115put_dev:
116 nfc_put_device(dev);
117error:
118 release_sock(sk);
119 return rc;
120}
121
122static int rawsock_add_header(struct sk_buff *skb)
123{
Samuel Ortize8753042011-08-19 15:47:11 +0200124 *skb_push(skb, NFC_HEADER_SIZE) = 0;
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300125
126 return 0;
127}
128
129static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100130 int err)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300131{
132 struct sock *sk = (struct sock *) context;
133
134 BUG_ON(in_irq());
135
Joe Perches20c239c2011-11-29 11:37:33 -0800136 pr_debug("sk=%p err=%d\n", sk, err);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300137
138 if (err)
139 goto error;
140
141 err = rawsock_add_header(skb);
142 if (err)
Thierry Escande4cf7e032013-07-10 10:55:37 +0200143 goto error_skb;
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300144
145 err = sock_queue_rcv_skb(sk, skb);
146 if (err)
Thierry Escande4cf7e032013-07-10 10:55:37 +0200147 goto error_skb;
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300148
149 spin_lock_bh(&sk->sk_write_queue.lock);
150 if (!skb_queue_empty(&sk->sk_write_queue))
151 schedule_work(&nfc_rawsock(sk)->tx_work);
152 else
153 nfc_rawsock(sk)->tx_work_scheduled = false;
154 spin_unlock_bh(&sk->sk_write_queue.lock);
155
156 sock_put(sk);
157 return;
158
Thierry Escande4cf7e032013-07-10 10:55:37 +0200159error_skb:
160 kfree_skb(skb);
161
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300162error:
163 rawsock_report_error(sk, err);
164 sock_put(sk);
165}
166
167static void rawsock_tx_work(struct work_struct *work)
168{
169 struct sock *sk = to_rawsock_sk(work);
170 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
171 u32 target_idx = nfc_rawsock(sk)->target_idx;
172 struct sk_buff *skb;
173 int rc;
174
Joe Perches20c239c2011-11-29 11:37:33 -0800175 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300176
177 if (sk->sk_shutdown & SEND_SHUTDOWN) {
178 rawsock_write_queue_purge(sk);
179 return;
180 }
181
182 skb = skb_dequeue(&sk->sk_write_queue);
183
184 sock_hold(sk);
185 rc = nfc_data_exchange(dev, target_idx, skb,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100186 rawsock_data_exchange_complete, sk);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300187 if (rc) {
188 rawsock_report_error(sk, rc);
189 sock_put(sk);
190 }
191}
192
193static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100194 struct msghdr *msg, size_t len)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300195{
196 struct sock *sk = sock->sk;
Samuel Ortize8753042011-08-19 15:47:11 +0200197 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300198 struct sk_buff *skb;
199 int rc;
200
Joe Perches20c239c2011-11-29 11:37:33 -0800201 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300202
203 if (msg->msg_namelen)
204 return -EOPNOTSUPP;
205
206 if (sock->state != SS_CONNECTED)
207 return -ENOTCONN;
208
Samuel Ortiz7c7cd3b2011-12-14 16:43:06 +0100209 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
210 if (skb == NULL)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300211 return rc;
212
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300213 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
214 if (rc < 0) {
215 kfree_skb(skb);
216 return rc;
217 }
218
219 spin_lock_bh(&sk->sk_write_queue.lock);
220 __skb_queue_tail(&sk->sk_write_queue, skb);
221 if (!nfc_rawsock(sk)->tx_work_scheduled) {
222 schedule_work(&nfc_rawsock(sk)->tx_work);
223 nfc_rawsock(sk)->tx_work_scheduled = true;
224 }
225 spin_unlock_bh(&sk->sk_write_queue.lock);
226
227 return len;
228}
229
230static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100231 struct msghdr *msg, size_t len, int flags)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300232{
233 int noblock = flags & MSG_DONTWAIT;
234 struct sock *sk = sock->sk;
235 struct sk_buff *skb;
236 int copied;
237 int rc;
238
Joe Perches20c239c2011-11-29 11:37:33 -0800239 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300240
241 skb = skb_recv_datagram(sk, flags, noblock, &rc);
242 if (!skb)
243 return rc;
244
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300245 copied = skb->len;
246 if (len < copied) {
247 msg->msg_flags |= MSG_TRUNC;
248 copied = len;
249 }
250
251 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
252
253 skb_free_datagram(sk, skb);
254
255 return rc ? : copied;
256}
257
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300258static const struct proto_ops rawsock_ops = {
259 .family = PF_NFC,
260 .owner = THIS_MODULE,
261 .release = rawsock_release,
262 .bind = sock_no_bind,
263 .connect = rawsock_connect,
264 .socketpair = sock_no_socketpair,
265 .accept = sock_no_accept,
266 .getname = sock_no_getname,
267 .poll = datagram_poll,
268 .ioctl = sock_no_ioctl,
269 .listen = sock_no_listen,
270 .shutdown = sock_no_shutdown,
271 .setsockopt = sock_no_setsockopt,
272 .getsockopt = sock_no_getsockopt,
273 .sendmsg = rawsock_sendmsg,
274 .recvmsg = rawsock_recvmsg,
275 .mmap = sock_no_mmap,
276};
277
278static void rawsock_destruct(struct sock *sk)
279{
Joe Perches20c239c2011-11-29 11:37:33 -0800280 pr_debug("sk=%p\n", sk);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300281
282 if (sk->sk_state == TCP_ESTABLISHED) {
283 nfc_deactivate_target(nfc_rawsock(sk)->dev,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100284 nfc_rawsock(sk)->target_idx);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300285 nfc_put_device(nfc_rawsock(sk)->dev);
286 }
287
288 skb_queue_purge(&sk->sk_receive_queue);
289
290 if (!sock_flag(sk, SOCK_DEAD)) {
Joe Perchesed1e0ad2011-11-29 11:37:32 -0800291 pr_err("Freeing alive NFC raw socket %p\n", sk);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300292 return;
293 }
294}
295
296static int rawsock_create(struct net *net, struct socket *sock,
Samuel Ortiz0a40acb2012-03-05 01:03:53 +0100297 const struct nfc_protocol *nfc_proto)
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300298{
299 struct sock *sk;
300
Joe Perches20c239c2011-11-29 11:37:33 -0800301 pr_debug("sock=%p\n", sock);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300302
303 if (sock->type != SOCK_SEQPACKET)
304 return -ESOCKTNOSUPPORT;
305
306 sock->ops = &rawsock_ops;
307
Samuel Ortizdb81a622011-12-14 16:43:08 +0100308 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
Lauro Ramos Venancio23b78692011-07-01 19:31:36 -0300309 if (!sk)
310 return -ENOMEM;
311
312 sock_init_data(sock, sk);
313 sk->sk_protocol = nfc_proto->id;
314 sk->sk_destruct = rawsock_destruct;
315 sock->state = SS_UNCONNECTED;
316
317 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
318 nfc_rawsock(sk)->tx_work_scheduled = false;
319
320 return 0;
321}
322
323static struct proto rawsock_proto = {
324 .name = "NFC_RAW",
325 .owner = THIS_MODULE,
326 .obj_size = sizeof(struct nfc_rawsock),
327};
328
329static const struct nfc_protocol rawsock_nfc_proto = {
330 .id = NFC_SOCKPROTO_RAW,
331 .proto = &rawsock_proto,
332 .owner = THIS_MODULE,
333 .create = rawsock_create
334};
335
336int __init rawsock_init(void)
337{
338 int rc;
339
340 rc = nfc_proto_register(&rawsock_nfc_proto);
341
342 return rc;
343}
344
345void rawsock_exit(void)
346{
347 nfc_proto_unregister(&rawsock_nfc_proto);
348}