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1/*
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
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.
22 */
23
24#include <net/tcp_states.h>
25#include <linux/nfc.h>
26
27#include "nfc.h"
28
29static void rawsock_write_queue_purge(struct sock *sk)
30{
31 nfc_dbg("sk=%p", sk);
32
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);
37}
38
39static void rawsock_report_error(struct sock *sk, int err)
40{
41 nfc_dbg("sk=%p err=%d", sk, err);
42
43 sk->sk_shutdown = SHUTDOWN_MASK;
44 sk->sk_err = -err;
45 sk->sk_error_report(sk);
46
47 rawsock_write_queue_purge(sk);
48}
49
50static int rawsock_release(struct socket *sock)
51{
52 struct sock *sk = sock->sk;
53
54 nfc_dbg("sock=%p", sock);
55
56 sock_orphan(sk);
57 sock_put(sk);
58
59 return 0;
60}
61
62static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
63 int len, int flags)
64{
65 struct sock *sk = sock->sk;
66 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
67 struct nfc_dev *dev;
68 int rc = 0;
69
70 nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags);
71
72 if (!addr || len < sizeof(struct sockaddr_nfc) ||
73 addr->sa_family != AF_NFC)
74 return -EINVAL;
75
76 nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx,
77 addr->target_idx, addr->nfc_protocol);
78
79 lock_sock(sk);
80
81 if (sock->state == SS_CONNECTED) {
82 rc = -EISCONN;
83 goto error;
84 }
85
86 dev = nfc_get_device(addr->dev_idx);
87 if (!dev) {
88 rc = -ENODEV;
89 goto error;
90 }
91
92 if (addr->target_idx > dev->target_idx - 1 ||
93 addr->target_idx < dev->target_idx - dev->n_targets) {
94 rc = -EINVAL;
95 goto error;
96 }
97
98 if (addr->target_idx > dev->target_idx - 1 ||
99 addr->target_idx < dev->target_idx - dev->n_targets) {
100 rc = -EINVAL;
101 goto error;
102 }
103
104 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
105 if (rc)
106 goto put_dev;
107
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);
113
114 release_sock(sk);
115 return 0;
116
117put_dev:
118 nfc_put_device(dev);
119error:
120 release_sock(sk);
121 return rc;
122}
123
124static int rawsock_add_header(struct sk_buff *skb)
125{
126
127 if (skb_cow_head(skb, 1))
128 return -ENOMEM;
129
130 *skb_push(skb, 1) = 0;
131
132 return 0;
133}
134
135static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
136 int err)
137{
138 struct sock *sk = (struct sock *) context;
139
140 BUG_ON(in_irq());
141
142 nfc_dbg("sk=%p err=%d", sk, err);
143
144 if (err)
145 goto error;
146
147 err = rawsock_add_header(skb);
148 if (err)
149 goto error;
150
151 err = sock_queue_rcv_skb(sk, skb);
152 if (err)
153 goto error;
154
155 spin_lock_bh(&sk->sk_write_queue.lock);
156 if (!skb_queue_empty(&sk->sk_write_queue))
157 schedule_work(&nfc_rawsock(sk)->tx_work);
158 else
159 nfc_rawsock(sk)->tx_work_scheduled = false;
160 spin_unlock_bh(&sk->sk_write_queue.lock);
161
162 sock_put(sk);
163 return;
164
165error:
166 rawsock_report_error(sk, err);
167 sock_put(sk);
168}
169
170static void rawsock_tx_work(struct work_struct *work)
171{
172 struct sock *sk = to_rawsock_sk(work);
173 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
174 u32 target_idx = nfc_rawsock(sk)->target_idx;
175 struct sk_buff *skb;
176 int rc;
177
178 nfc_dbg("sk=%p target_idx=%u", sk, target_idx);
179
180 if (sk->sk_shutdown & SEND_SHUTDOWN) {
181 rawsock_write_queue_purge(sk);
182 return;
183 }
184
185 skb = skb_dequeue(&sk->sk_write_queue);
186
187 sock_hold(sk);
188 rc = nfc_data_exchange(dev, target_idx, skb,
189 rawsock_data_exchange_complete, sk);
190 if (rc) {
191 rawsock_report_error(sk, rc);
192 sock_put(sk);
193 }
194}
195
196static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
197 struct msghdr *msg, size_t len)
198{
199 struct sock *sk = sock->sk;
200 struct sk_buff *skb;
201 int rc;
202
203 nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len);
204
205 if (msg->msg_namelen)
206 return -EOPNOTSUPP;
207
208 if (sock->state != SS_CONNECTED)
209 return -ENOTCONN;
210
211 skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT,
212 &rc);
213 if (!skb)
214 return rc;
215
216 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
217 if (rc < 0) {
218 kfree_skb(skb);
219 return rc;
220 }
221
222 spin_lock_bh(&sk->sk_write_queue.lock);
223 __skb_queue_tail(&sk->sk_write_queue, skb);
224 if (!nfc_rawsock(sk)->tx_work_scheduled) {
225 schedule_work(&nfc_rawsock(sk)->tx_work);
226 nfc_rawsock(sk)->tx_work_scheduled = true;
227 }
228 spin_unlock_bh(&sk->sk_write_queue.lock);
229
230 return len;
231}
232
233static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
234 struct msghdr *msg, size_t len, int flags)
235{
236 int noblock = flags & MSG_DONTWAIT;
237 struct sock *sk = sock->sk;
238 struct sk_buff *skb;
239 int copied;
240 int rc;
241
242 nfc_dbg("sock=%p sk=%p len=%zu flags=%d", sock, sk, len, flags);
243
244 skb = skb_recv_datagram(sk, flags, noblock, &rc);
245 if (!skb)
246 return rc;
247
248 msg->msg_namelen = 0;
249
250 copied = skb->len;
251 if (len < copied) {
252 msg->msg_flags |= MSG_TRUNC;
253 copied = len;
254 }
255
256 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
257
258 skb_free_datagram(sk, skb);
259
260 return rc ? : copied;
261}
262
263
264static const struct proto_ops rawsock_ops = {
265 .family = PF_NFC,
266 .owner = THIS_MODULE,
267 .release = rawsock_release,
268 .bind = sock_no_bind,
269 .connect = rawsock_connect,
270 .socketpair = sock_no_socketpair,
271 .accept = sock_no_accept,
272 .getname = sock_no_getname,
273 .poll = datagram_poll,
274 .ioctl = sock_no_ioctl,
275 .listen = sock_no_listen,
276 .shutdown = sock_no_shutdown,
277 .setsockopt = sock_no_setsockopt,
278 .getsockopt = sock_no_getsockopt,
279 .sendmsg = rawsock_sendmsg,
280 .recvmsg = rawsock_recvmsg,
281 .mmap = sock_no_mmap,
282};
283
284static void rawsock_destruct(struct sock *sk)
285{
286 nfc_dbg("sk=%p", sk);
287
288 if (sk->sk_state == TCP_ESTABLISHED) {
289 nfc_deactivate_target(nfc_rawsock(sk)->dev,
290 nfc_rawsock(sk)->target_idx);
291 nfc_put_device(nfc_rawsock(sk)->dev);
292 }
293
294 skb_queue_purge(&sk->sk_receive_queue);
295
296 if (!sock_flag(sk, SOCK_DEAD)) {
297 nfc_err("Freeing alive NFC raw socket %p", sk);
298 return;
299 }
300}
301
302static int rawsock_create(struct net *net, struct socket *sock,
303 const struct nfc_protocol *nfc_proto)
304{
305 struct sock *sk;
306
307 nfc_dbg("sock=%p", sock);
308
309 if (sock->type != SOCK_SEQPACKET)
310 return -ESOCKTNOSUPPORT;
311
312 sock->ops = &rawsock_ops;
313
314 sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto);
315 if (!sk)
316 return -ENOMEM;
317
318 sock_init_data(sock, sk);
319 sk->sk_protocol = nfc_proto->id;
320 sk->sk_destruct = rawsock_destruct;
321 sock->state = SS_UNCONNECTED;
322
323 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
324 nfc_rawsock(sk)->tx_work_scheduled = false;
325
326 return 0;
327}
328
329static struct proto rawsock_proto = {
330 .name = "NFC_RAW",
331 .owner = THIS_MODULE,
332 .obj_size = sizeof(struct nfc_rawsock),
333};
334
335static const struct nfc_protocol rawsock_nfc_proto = {
336 .id = NFC_SOCKPROTO_RAW,
337 .proto = &rawsock_proto,
338 .owner = THIS_MODULE,
339 .create = rawsock_create
340};
341
342int __init rawsock_init(void)
343{
344 int rc;
345
346 rc = nfc_proto_register(&rawsock_nfc_proto);
347
348 return rc;
349}
350
351void rawsock_exit(void)
352{
353 nfc_proto_unregister(&rawsock_nfc_proto);
354}
1/*
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
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
23
24#include <net/tcp_states.h>
25#include <linux/nfc.h>
26#include <linux/export.h>
27
28#include "nfc.h"
29
30static void rawsock_write_queue_purge(struct sock *sk)
31{
32 pr_debug("sk=%p\n", sk);
33
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{
42 pr_debug("sk=%p err=%d\n", sk, err);
43
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
55 pr_debug("sock=%p sk=%p\n", sock, sk);
56
57 if (!sk)
58 return 0;
59
60 sock_orphan(sk);
61 sock_put(sk);
62
63 return 0;
64}
65
66static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
67 int len, int flags)
68{
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
74 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
75
76 if (!addr || len < sizeof(struct sockaddr_nfc) ||
77 addr->sa_family != AF_NFC)
78 return -EINVAL;
79
80 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
81 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
82
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
96 if (addr->target_idx > dev->target_next_idx - 1 ||
97 addr->target_idx < dev->target_next_idx - dev->n_targets) {
98 rc = -EINVAL;
99 goto error;
100 }
101
102 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{
124 *skb_push(skb, NFC_HEADER_SIZE) = 0;
125
126 return 0;
127}
128
129static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
130 int err)
131{
132 struct sock *sk = (struct sock *) context;
133
134 BUG_ON(in_irq());
135
136 pr_debug("sk=%p err=%d\n", sk, err);
137
138 if (err)
139 goto error;
140
141 err = rawsock_add_header(skb);
142 if (err)
143 goto error_skb;
144
145 err = sock_queue_rcv_skb(sk, skb);
146 if (err)
147 goto error_skb;
148
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
159error_skb:
160 kfree_skb(skb);
161
162error:
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
175 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
176
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,
186 rawsock_data_exchange_complete, sk);
187 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,
194 struct msghdr *msg, size_t len)
195{
196 struct sock *sk = sock->sk;
197 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
198 struct sk_buff *skb;
199 int rc;
200
201 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
202
203 if (msg->msg_namelen)
204 return -EOPNOTSUPP;
205
206 if (sock->state != SS_CONNECTED)
207 return -ENOTCONN;
208
209 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
210 if (skb == NULL)
211 return rc;
212
213 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,
231 struct msghdr *msg, size_t len, int flags)
232{
233 int noblock = flags & MSG_DONTWAIT;
234 struct sock *sk = sock->sk;
235 struct sk_buff *skb;
236 int copied;
237 int rc;
238
239 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
240
241 skb = skb_recv_datagram(sk, flags, noblock, &rc);
242 if (!skb)
243 return rc;
244
245 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
258static 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{
280 pr_debug("sk=%p\n", sk);
281
282 if (sk->sk_state == TCP_ESTABLISHED) {
283 nfc_deactivate_target(nfc_rawsock(sk)->dev,
284 nfc_rawsock(sk)->target_idx);
285 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)) {
291 pr_err("Freeing alive NFC raw socket %p\n", sk);
292 return;
293 }
294}
295
296static int rawsock_create(struct net *net, struct socket *sock,
297 const struct nfc_protocol *nfc_proto)
298{
299 struct sock *sk;
300
301 pr_debug("sock=%p\n", sock);
302
303 if (sock->type != SOCK_SEQPACKET)
304 return -ESOCKTNOSUPPORT;
305
306 sock->ops = &rawsock_ops;
307
308 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
309 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}