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23b7869c LRV |
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> | |
bc3b2d7f | 26 | #include <linux/export.h> |
23b7869c LRV |
27 | |
28 | #include "nfc.h" | |
29 | ||
30 | static void rawsock_write_queue_purge(struct sock *sk) | |
31 | { | |
32 | nfc_dbg("sk=%p", 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 | ||
40 | static void rawsock_report_error(struct sock *sk, int err) | |
41 | { | |
42 | nfc_dbg("sk=%p err=%d", 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 | ||
51 | static int rawsock_release(struct socket *sock) | |
52 | { | |
53 | struct sock *sk = sock->sk; | |
54 | ||
55 | nfc_dbg("sock=%p", sock); | |
56 | ||
57 | sock_orphan(sk); | |
58 | sock_put(sk); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, | |
64 | int len, int flags) | |
65 | { | |
66 | struct sock *sk = sock->sk; | |
67 | struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; | |
68 | struct nfc_dev *dev; | |
69 | int rc = 0; | |
70 | ||
71 | nfc_dbg("sock=%p sk=%p flags=%d", sock, sk, flags); | |
72 | ||
73 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
74 | addr->sa_family != AF_NFC) | |
75 | return -EINVAL; | |
76 | ||
77 | nfc_dbg("addr dev_idx=%u target_idx=%u protocol=%u", addr->dev_idx, | |
78 | addr->target_idx, addr->nfc_protocol); | |
79 | ||
80 | lock_sock(sk); | |
81 | ||
82 | if (sock->state == SS_CONNECTED) { | |
83 | rc = -EISCONN; | |
84 | goto error; | |
85 | } | |
86 | ||
87 | dev = nfc_get_device(addr->dev_idx); | |
88 | if (!dev) { | |
89 | rc = -ENODEV; | |
90 | goto error; | |
91 | } | |
92 | ||
93 | if (addr->target_idx > dev->target_idx - 1 || | |
94 | addr->target_idx < dev->target_idx - dev->n_targets) { | |
95 | rc = -EINVAL; | |
96 | goto error; | |
97 | } | |
98 | ||
99 | if (addr->target_idx > dev->target_idx - 1 || | |
100 | addr->target_idx < dev->target_idx - dev->n_targets) { | |
101 | rc = -EINVAL; | |
102 | goto error; | |
103 | } | |
104 | ||
105 | rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); | |
106 | if (rc) | |
107 | goto put_dev; | |
108 | ||
109 | nfc_rawsock(sk)->dev = dev; | |
110 | nfc_rawsock(sk)->target_idx = addr->target_idx; | |
111 | sock->state = SS_CONNECTED; | |
112 | sk->sk_state = TCP_ESTABLISHED; | |
113 | sk->sk_state_change(sk); | |
114 | ||
115 | release_sock(sk); | |
116 | return 0; | |
117 | ||
118 | put_dev: | |
119 | nfc_put_device(dev); | |
120 | error: | |
121 | release_sock(sk); | |
122 | return rc; | |
123 | } | |
124 | ||
125 | static int rawsock_add_header(struct sk_buff *skb) | |
126 | { | |
e8753043 | 127 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
133 | int err) | |
134 | { | |
135 | struct sock *sk = (struct sock *) context; | |
136 | ||
137 | BUG_ON(in_irq()); | |
138 | ||
139 | nfc_dbg("sk=%p err=%d", sk, err); | |
140 | ||
141 | if (err) | |
142 | goto error; | |
143 | ||
144 | err = rawsock_add_header(skb); | |
145 | if (err) | |
146 | goto error; | |
147 | ||
148 | err = sock_queue_rcv_skb(sk, skb); | |
149 | if (err) | |
150 | goto error; | |
151 | ||
152 | spin_lock_bh(&sk->sk_write_queue.lock); | |
153 | if (!skb_queue_empty(&sk->sk_write_queue)) | |
154 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
155 | else | |
156 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
157 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
158 | ||
159 | sock_put(sk); | |
160 | return; | |
161 | ||
162 | error: | |
163 | rawsock_report_error(sk, err); | |
164 | sock_put(sk); | |
165 | } | |
166 | ||
167 | static 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 | nfc_dbg("sk=%p target_idx=%u", 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 | ||
193 | static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
194 | struct msghdr *msg, size_t len) | |
195 | { | |
196 | struct sock *sk = sock->sk; | |
e8753043 | 197 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; |
23b7869c LRV |
198 | struct sk_buff *skb; |
199 | int rc; | |
200 | ||
201 | nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len); | |
202 | ||
203 | if (msg->msg_namelen) | |
204 | return -EOPNOTSUPP; | |
205 | ||
206 | if (sock->state != SS_CONNECTED) | |
207 | return -ENOTCONN; | |
208 | ||
e8753043 SO |
209 | skb = sock_alloc_send_skb(sk, len + dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE, |
210 | msg->msg_flags & MSG_DONTWAIT, &rc); | |
23b7869c LRV |
211 | if (!skb) |
212 | return rc; | |
213 | ||
e8753043 SO |
214 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
215 | ||
23b7869c LRV |
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 | ||
233 | static 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 | ||
264 | static 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 | ||
284 | static 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 | ||
302 | static 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 | ||
329 | static struct proto rawsock_proto = { | |
330 | .name = "NFC_RAW", | |
331 | .owner = THIS_MODULE, | |
332 | .obj_size = sizeof(struct nfc_rawsock), | |
333 | }; | |
334 | ||
335 | static 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 | ||
342 | int __init rawsock_init(void) | |
343 | { | |
344 | int rc; | |
345 | ||
346 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
347 | ||
348 | return rc; | |
349 | } | |
350 | ||
351 | void rawsock_exit(void) | |
352 | { | |
353 | nfc_proto_unregister(&rawsock_nfc_proto); | |
354 | } |