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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 | ||
52858b51 | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 25 | |
23b7869c LRV |
26 | #include <net/tcp_states.h> |
27 | #include <linux/nfc.h> | |
bc3b2d7f | 28 | #include <linux/export.h> |
23b7869c LRV |
29 | |
30 | #include "nfc.h" | |
31 | ||
32 | static void rawsock_write_queue_purge(struct sock *sk) | |
33 | { | |
20c239c1 | 34 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
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 | { | |
20c239c1 | 44 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
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 | ||
03e934f6 ED |
57 | pr_debug("sock=%p sk=%p\n", sock, sk); |
58 | ||
59 | if (!sk) | |
60 | return 0; | |
23b7869c LRV |
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, | |
0a40acb2 | 69 | int len, int flags) |
23b7869c LRV |
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 | ||
20c239c1 | 76 | pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); |
23b7869c LRV |
77 | |
78 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
0a40acb2 | 79 | addr->sa_family != AF_NFC) |
23b7869c LRV |
80 | return -EINVAL; |
81 | ||
20c239c1 JP |
82 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", |
83 | addr->dev_idx, addr->target_idx, addr->nfc_protocol); | |
23b7869c LRV |
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 | ||
01ae0eea EL |
98 | if (addr->target_idx > dev->target_next_idx - 1 || |
99 | addr->target_idx < dev->target_next_idx - dev->n_targets) { | |
c4fbb651 SO |
100 | rc = -EINVAL; |
101 | goto error; | |
102 | } | |
103 | ||
23b7869c LRV |
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 | { | |
e8753043 | 126 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
127 | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
0a40acb2 | 132 | int err) |
23b7869c LRV |
133 | { |
134 | struct sock *sk = (struct sock *) context; | |
135 | ||
136 | BUG_ON(in_irq()); | |
137 | ||
20c239c1 | 138 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
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 | ||
20c239c1 | 174 | pr_debug("sk=%p target_idx=%u\n", sk, target_idx); |
23b7869c LRV |
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, | |
0a40acb2 | 185 | rawsock_data_exchange_complete, sk); |
23b7869c LRV |
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, | |
0a40acb2 | 193 | struct msghdr *msg, size_t len) |
23b7869c LRV |
194 | { |
195 | struct sock *sk = sock->sk; | |
e8753043 | 196 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; |
23b7869c LRV |
197 | struct sk_buff *skb; |
198 | int rc; | |
199 | ||
20c239c1 | 200 | pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); |
23b7869c LRV |
201 | |
202 | if (msg->msg_namelen) | |
203 | return -EOPNOTSUPP; | |
204 | ||
205 | if (sock->state != SS_CONNECTED) | |
206 | return -ENOTCONN; | |
207 | ||
7c7cd3bf SO |
208 | skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); |
209 | if (skb == NULL) | |
23b7869c LRV |
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, | |
0a40acb2 | 230 | struct msghdr *msg, size_t len, int flags) |
23b7869c LRV |
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 | ||
20c239c1 | 238 | pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); |
23b7869c LRV |
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 | ||
260 | static 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 | ||
280 | static void rawsock_destruct(struct sock *sk) | |
281 | { | |
20c239c1 | 282 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
283 | |
284 | if (sk->sk_state == TCP_ESTABLISHED) { | |
285 | nfc_deactivate_target(nfc_rawsock(sk)->dev, | |
0a40acb2 | 286 | nfc_rawsock(sk)->target_idx); |
23b7869c LRV |
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)) { | |
ed1e0ad8 | 293 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
23b7869c LRV |
294 | return; |
295 | } | |
296 | } | |
297 | ||
298 | static int rawsock_create(struct net *net, struct socket *sock, | |
0a40acb2 | 299 | const struct nfc_protocol *nfc_proto) |
23b7869c LRV |
300 | { |
301 | struct sock *sk; | |
302 | ||
20c239c1 | 303 | pr_debug("sock=%p\n", sock); |
23b7869c LRV |
304 | |
305 | if (sock->type != SOCK_SEQPACKET) | |
306 | return -ESOCKTNOSUPPORT; | |
307 | ||
308 | sock->ops = &rawsock_ops; | |
309 | ||
db81a624 | 310 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); |
23b7869c LRV |
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 | ||
325 | static struct proto rawsock_proto = { | |
326 | .name = "NFC_RAW", | |
327 | .owner = THIS_MODULE, | |
328 | .obj_size = sizeof(struct nfc_rawsock), | |
329 | }; | |
330 | ||
331 | static 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 | ||
338 | int __init rawsock_init(void) | |
339 | { | |
340 | int rc; | |
341 | ||
342 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
343 | ||
344 | return rc; | |
345 | } | |
346 | ||
347 | void rawsock_exit(void) | |
348 | { | |
349 | nfc_proto_unregister(&rawsock_nfc_proto); | |
350 | } |