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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 | #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 | |
32 | static 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 | |
42 | static 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 | |
53 | static 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 | |
68 | static 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 | |
117 | put_dev: |
118 | nfc_put_device(dev); |
119 | error: |
120 | release_sock(sk); |
121 | return rc; |
122 | } |
123 | |
124 | static int rawsock_add_header(struct sk_buff *skb) |
125 | { |
126 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
127 | |
128 | return 0; |
129 | } |
130 | |
131 | static 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 | |
161 | error: |
162 | rawsock_report_error(sk, err); |
163 | sock_put(sk); |
164 | } |
165 | |
166 | static 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 | |
192 | static 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 | |
229 | static 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 | static const struct proto_ops rawsock_ops = { |
260 | .family = PF_NFC, |
261 | .owner = THIS_MODULE, |
262 | .release = rawsock_release, |
263 | .bind = sock_no_bind, |
264 | .connect = rawsock_connect, |
265 | .socketpair = sock_no_socketpair, |
266 | .accept = sock_no_accept, |
267 | .getname = sock_no_getname, |
268 | .poll = datagram_poll, |
269 | .ioctl = sock_no_ioctl, |
270 | .listen = sock_no_listen, |
271 | .shutdown = sock_no_shutdown, |
272 | .setsockopt = sock_no_setsockopt, |
273 | .getsockopt = sock_no_getsockopt, |
274 | .sendmsg = rawsock_sendmsg, |
275 | .recvmsg = rawsock_recvmsg, |
276 | .mmap = sock_no_mmap, |
277 | }; |
278 | |
279 | static void rawsock_destruct(struct sock *sk) |
280 | { |
281 | pr_debug("sk=%p\n", sk); |
282 | |
283 | if (sk->sk_state == TCP_ESTABLISHED) { |
284 | nfc_deactivate_target(nfc_rawsock(sk)->dev, |
285 | nfc_rawsock(sk)->target_idx); |
286 | nfc_put_device(nfc_rawsock(sk)->dev); |
287 | } |
288 | |
289 | skb_queue_purge(&sk->sk_receive_queue); |
290 | |
291 | if (!sock_flag(sk, SOCK_DEAD)) { |
292 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
293 | return; |
294 | } |
295 | } |
296 | |
297 | static int rawsock_create(struct net *net, struct socket *sock, |
298 | const struct nfc_protocol *nfc_proto) |
299 | { |
300 | struct sock *sk; |
301 | |
302 | pr_debug("sock=%p\n", sock); |
303 | |
304 | if (sock->type != SOCK_SEQPACKET) |
305 | return -ESOCKTNOSUPPORT; |
306 | |
307 | sock->ops = &rawsock_ops; |
308 | |
309 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); |
310 | if (!sk) |
311 | return -ENOMEM; |
312 | |
313 | sock_init_data(sock, sk); |
314 | sk->sk_protocol = nfc_proto->id; |
315 | sk->sk_destruct = rawsock_destruct; |
316 | sock->state = SS_UNCONNECTED; |
317 | |
318 | INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); |
319 | nfc_rawsock(sk)->tx_work_scheduled = false; |
320 | |
321 | return 0; |
322 | } |
323 | |
324 | static struct proto rawsock_proto = { |
325 | .name = "NFC_RAW", |
326 | .owner = THIS_MODULE, |
327 | .obj_size = sizeof(struct nfc_rawsock), |
328 | }; |
329 | |
330 | static const struct nfc_protocol rawsock_nfc_proto = { |
331 | .id = NFC_SOCKPROTO_RAW, |
332 | .proto = &rawsock_proto, |
333 | .owner = THIS_MODULE, |
334 | .create = rawsock_create |
335 | }; |
336 | |
337 | int __init rawsock_init(void) |
338 | { |
339 | int rc; |
340 | |
341 | rc = nfc_proto_register(&rawsock_nfc_proto); |
342 | |
343 | return rc; |
344 | } |
345 | |
346 | void rawsock_exit(void) |
347 | { |
348 | nfc_proto_unregister(&rawsock_nfc_proto); |
349 | } |
350 |
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