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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, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26#include <net/tcp_states.h>
27#include <linux/nfc.h>
28#include <linux/export.h>
29
30#include "nfc.h"
31
32static void rawsock_write_queue_purge(struct sock *sk)
33{
34 pr_debug("sk=%p\n", sk);
35
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);
40}
41
42static void rawsock_report_error(struct sock *sk, int err)
43{
44 pr_debug("sk=%p err=%d\n", sk, err);
45
46 sk->sk_shutdown = SHUTDOWN_MASK;
47 sk->sk_err = -err;
48 sk->sk_error_report(sk);
49
50 rawsock_write_queue_purge(sk);
51}
52
53static int rawsock_release(struct socket *sock)
54{
55 struct sock *sk = sock->sk;
56
57 pr_debug("sock=%p sk=%p\n", sock, sk);
58
59 if (!sk)
60 return 0;
61
62 sock_orphan(sk);
63 sock_put(sk);
64
65 return 0;
66}
67
68static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
69 int len, int flags)
70{
71 struct sock *sk = sock->sk;
72 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
73 struct nfc_dev *dev;
74 int rc = 0;
75
76 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
77
78 if (!addr || len < sizeof(struct sockaddr_nfc) ||
79 addr->sa_family != AF_NFC)
80 return -EINVAL;
81
82 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
83 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
84
85 lock_sock(sk);
86
87 if (sock->state == SS_CONNECTED) {
88 rc = -EISCONN;
89 goto error;
90 }
91
92 dev = nfc_get_device(addr->dev_idx);
93 if (!dev) {
94 rc = -ENODEV;
95 goto error;
96 }
97
98 if (addr->target_idx > dev->target_next_idx - 1 ||
99 addr->target_idx < dev->target_next_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 *skb_push(skb, NFC_HEADER_SIZE) = 0;
127
128 return 0;
129}
130
131static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
132 int err)
133{
134 struct sock *sk = (struct sock *) context;
135
136 BUG_ON(in_irq());
137
138 pr_debug("sk=%p err=%d\n", sk, err);
139
140 if (err)
141 goto error;
142
143 err = rawsock_add_header(skb);
144 if (err)
145 goto error;
146
147 err = sock_queue_rcv_skb(sk, skb);
148 if (err)
149 goto error;
150
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);
154 else
155 nfc_rawsock(sk)->tx_work_scheduled = false;
156 spin_unlock_bh(&sk->sk_write_queue.lock);
157
158 sock_put(sk);
159 return;
160
161error:
162 rawsock_report_error(sk, err);
163 sock_put(sk);
164}
165
166static void rawsock_tx_work(struct work_struct *work)
167{
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;
171 struct sk_buff *skb;
172 int rc;
173
174 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
175
176 if (sk->sk_shutdown & SEND_SHUTDOWN) {
177 rawsock_write_queue_purge(sk);
178 return;
179 }
180
181 skb = skb_dequeue(&sk->sk_write_queue);
182
183 sock_hold(sk);
184 rc = nfc_data_exchange(dev, target_idx, skb,
185 rawsock_data_exchange_complete, sk);
186 if (rc) {
187 rawsock_report_error(sk, rc);
188 sock_put(sk);
189 }
190}
191
192static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
193 struct msghdr *msg, size_t len)
194{
195 struct sock *sk = sock->sk;
196 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
197 struct sk_buff *skb;
198 int rc;
199
200 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
201
202 if (msg->msg_namelen)
203 return -EOPNOTSUPP;
204
205 if (sock->state != SS_CONNECTED)
206 return -ENOTCONN;
207
208 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
209 if (skb == NULL)
210 return rc;
211
212 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
213 if (rc < 0) {
214 kfree_skb(skb);
215 return rc;
216 }
217
218 spin_lock_bh(&sk->sk_write_queue.lock);
219 __skb_queue_tail(&sk->sk_write_queue, skb);
220 if (!nfc_rawsock(sk)->tx_work_scheduled) {
221 schedule_work(&nfc_rawsock(sk)->tx_work);
222 nfc_rawsock(sk)->tx_work_scheduled = true;
223 }
224 spin_unlock_bh(&sk->sk_write_queue.lock);
225
226 return len;
227}
228
229static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
230 struct msghdr *msg, size_t len, int flags)
231{
232 int noblock = flags & MSG_DONTWAIT;
233 struct sock *sk = sock->sk;
234 struct sk_buff *skb;
235 int copied;
236 int rc;
237
238 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
239
240 skb = skb_recv_datagram(sk, flags, noblock, &rc);
241 if (!skb)
242 return rc;
243
244 msg->msg_namelen = 0;
245
246 copied = skb->len;
247 if (len < copied) {
248 msg->msg_flags |= MSG_TRUNC;
249 copied = len;
250 }
251
252 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
253
254 skb_free_datagram(sk, skb);
255
256 return rc ? : copied;
257}
258
259
260static const struct proto_ops rawsock_ops = {
261 .family = PF_NFC,
262 .owner = THIS_MODULE,
263 .release = rawsock_release,
264 .bind = sock_no_bind,
265 .connect = rawsock_connect,
266 .socketpair = sock_no_socketpair,
267 .accept = sock_no_accept,
268 .getname = sock_no_getname,
269 .poll = datagram_poll,
270 .ioctl = sock_no_ioctl,
271 .listen = sock_no_listen,
272 .shutdown = sock_no_shutdown,
273 .setsockopt = sock_no_setsockopt,
274 .getsockopt = sock_no_getsockopt,
275 .sendmsg = rawsock_sendmsg,
276 .recvmsg = rawsock_recvmsg,
277 .mmap = sock_no_mmap,
278};
279
280static void rawsock_destruct(struct sock *sk)
281{
282 pr_debug("sk=%p\n", sk);
283
284 if (sk->sk_state == TCP_ESTABLISHED) {
285 nfc_deactivate_target(nfc_rawsock(sk)->dev,
286 nfc_rawsock(sk)->target_idx);
287 nfc_put_device(nfc_rawsock(sk)->dev);
288 }
289
290 skb_queue_purge(&sk->sk_receive_queue);
291
292 if (!sock_flag(sk, SOCK_DEAD)) {
293 pr_err("Freeing alive NFC raw socket %p\n", sk);
294 return;
295 }
296}
297
298static int rawsock_create(struct net *net, struct socket *sock,
299 const struct nfc_protocol *nfc_proto)
300{
301 struct sock *sk;
302
303 pr_debug("sock=%p\n", sock);
304
305 if (sock->type != SOCK_SEQPACKET)
306 return -ESOCKTNOSUPPORT;
307
308 sock->ops = &rawsock_ops;
309
310 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
311 if (!sk)
312 return -ENOMEM;
313
314 sock_init_data(sock, sk);
315 sk->sk_protocol = nfc_proto->id;
316 sk->sk_destruct = rawsock_destruct;
317 sock->state = SS_UNCONNECTED;
318
319 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
320 nfc_rawsock(sk)->tx_work_scheduled = false;
321
322 return 0;
323}
324
325static struct proto rawsock_proto = {
326 .name = "NFC_RAW",
327 .owner = THIS_MODULE,
328 .obj_size = sizeof(struct nfc_rawsock),
329};
330
331static const struct nfc_protocol rawsock_nfc_proto = {
332 .id = NFC_SOCKPROTO_RAW,
333 .proto = &rawsock_proto,
334 .owner = THIS_MODULE,
335 .create = rawsock_create
336};
337
338int __init rawsock_init(void)
339{
340 int rc;
341
342 rc = nfc_proto_register(&rawsock_nfc_proto);
343
344 return rc;
345}
346
347void rawsock_exit(void)
348{
349 nfc_proto_unregister(&rawsock_nfc_proto);
350}