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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 | ||
20c239c1 | 57 | pr_debug("sock=%p\n", sock); |
23b7869c LRV |
58 | |
59 | sock_orphan(sk); | |
60 | sock_put(sk); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, | |
0a40acb2 | 66 | int len, int flags) |
23b7869c LRV |
67 | { |
68 | struct sock *sk = sock->sk; | |
69 | struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; | |
70 | struct nfc_dev *dev; | |
71 | int rc = 0; | |
72 | ||
20c239c1 | 73 | pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); |
23b7869c LRV |
74 | |
75 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
0a40acb2 | 76 | addr->sa_family != AF_NFC) |
23b7869c LRV |
77 | return -EINVAL; |
78 | ||
20c239c1 JP |
79 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", |
80 | addr->dev_idx, addr->target_idx, addr->nfc_protocol); | |
23b7869c LRV |
81 | |
82 | lock_sock(sk); | |
83 | ||
84 | if (sock->state == SS_CONNECTED) { | |
85 | rc = -EISCONN; | |
86 | goto error; | |
87 | } | |
88 | ||
89 | dev = nfc_get_device(addr->dev_idx); | |
90 | if (!dev) { | |
91 | rc = -ENODEV; | |
92 | goto error; | |
93 | } | |
94 | ||
c4fbb651 SO |
95 | if (addr->target_idx > dev->target_idx - 1 || |
96 | addr->target_idx < dev->target_idx - dev->n_targets) { | |
97 | rc = -EINVAL; | |
98 | goto error; | |
99 | } | |
100 | ||
23b7869c LRV |
101 | rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); |
102 | if (rc) | |
103 | goto put_dev; | |
104 | ||
105 | nfc_rawsock(sk)->dev = dev; | |
106 | nfc_rawsock(sk)->target_idx = addr->target_idx; | |
107 | sock->state = SS_CONNECTED; | |
108 | sk->sk_state = TCP_ESTABLISHED; | |
109 | sk->sk_state_change(sk); | |
110 | ||
111 | release_sock(sk); | |
112 | return 0; | |
113 | ||
114 | put_dev: | |
115 | nfc_put_device(dev); | |
116 | error: | |
117 | release_sock(sk); | |
118 | return rc; | |
119 | } | |
120 | ||
121 | static int rawsock_add_header(struct sk_buff *skb) | |
122 | { | |
e8753043 | 123 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
124 | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
0a40acb2 | 129 | int err) |
23b7869c LRV |
130 | { |
131 | struct sock *sk = (struct sock *) context; | |
132 | ||
133 | BUG_ON(in_irq()); | |
134 | ||
20c239c1 | 135 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
136 | |
137 | if (err) | |
138 | goto error; | |
139 | ||
140 | err = rawsock_add_header(skb); | |
141 | if (err) | |
142 | goto error; | |
143 | ||
144 | err = sock_queue_rcv_skb(sk, skb); | |
145 | if (err) | |
146 | goto error; | |
147 | ||
148 | spin_lock_bh(&sk->sk_write_queue.lock); | |
149 | if (!skb_queue_empty(&sk->sk_write_queue)) | |
150 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
151 | else | |
152 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
153 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
154 | ||
155 | sock_put(sk); | |
156 | return; | |
157 | ||
158 | error: | |
159 | rawsock_report_error(sk, err); | |
160 | sock_put(sk); | |
161 | } | |
162 | ||
163 | static void rawsock_tx_work(struct work_struct *work) | |
164 | { | |
165 | struct sock *sk = to_rawsock_sk(work); | |
166 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; | |
167 | u32 target_idx = nfc_rawsock(sk)->target_idx; | |
168 | struct sk_buff *skb; | |
169 | int rc; | |
170 | ||
20c239c1 | 171 | pr_debug("sk=%p target_idx=%u\n", sk, target_idx); |
23b7869c LRV |
172 | |
173 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
174 | rawsock_write_queue_purge(sk); | |
175 | return; | |
176 | } | |
177 | ||
178 | skb = skb_dequeue(&sk->sk_write_queue); | |
179 | ||
180 | sock_hold(sk); | |
181 | rc = nfc_data_exchange(dev, target_idx, skb, | |
0a40acb2 | 182 | rawsock_data_exchange_complete, sk); |
23b7869c LRV |
183 | if (rc) { |
184 | rawsock_report_error(sk, rc); | |
185 | sock_put(sk); | |
186 | } | |
187 | } | |
188 | ||
189 | static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
0a40acb2 | 190 | struct msghdr *msg, size_t len) |
23b7869c LRV |
191 | { |
192 | struct sock *sk = sock->sk; | |
e8753043 | 193 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; |
23b7869c LRV |
194 | struct sk_buff *skb; |
195 | int rc; | |
196 | ||
20c239c1 | 197 | pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); |
23b7869c LRV |
198 | |
199 | if (msg->msg_namelen) | |
200 | return -EOPNOTSUPP; | |
201 | ||
202 | if (sock->state != SS_CONNECTED) | |
203 | return -ENOTCONN; | |
204 | ||
7c7cd3bf SO |
205 | skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); |
206 | if (skb == NULL) | |
23b7869c LRV |
207 | return rc; |
208 | ||
209 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
210 | if (rc < 0) { | |
211 | kfree_skb(skb); | |
212 | return rc; | |
213 | } | |
214 | ||
215 | spin_lock_bh(&sk->sk_write_queue.lock); | |
216 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
217 | if (!nfc_rawsock(sk)->tx_work_scheduled) { | |
218 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
219 | nfc_rawsock(sk)->tx_work_scheduled = true; | |
220 | } | |
221 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
222 | ||
223 | return len; | |
224 | } | |
225 | ||
226 | static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
0a40acb2 | 227 | struct msghdr *msg, size_t len, int flags) |
23b7869c LRV |
228 | { |
229 | int noblock = flags & MSG_DONTWAIT; | |
230 | struct sock *sk = sock->sk; | |
231 | struct sk_buff *skb; | |
232 | int copied; | |
233 | int rc; | |
234 | ||
20c239c1 | 235 | pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); |
23b7869c LRV |
236 | |
237 | skb = skb_recv_datagram(sk, flags, noblock, &rc); | |
238 | if (!skb) | |
239 | return rc; | |
240 | ||
241 | msg->msg_namelen = 0; | |
242 | ||
243 | copied = skb->len; | |
244 | if (len < copied) { | |
245 | msg->msg_flags |= MSG_TRUNC; | |
246 | copied = len; | |
247 | } | |
248 | ||
249 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
250 | ||
251 | skb_free_datagram(sk, skb); | |
252 | ||
253 | return rc ? : copied; | |
254 | } | |
255 | ||
256 | ||
257 | static const struct proto_ops rawsock_ops = { | |
258 | .family = PF_NFC, | |
259 | .owner = THIS_MODULE, | |
260 | .release = rawsock_release, | |
261 | .bind = sock_no_bind, | |
262 | .connect = rawsock_connect, | |
263 | .socketpair = sock_no_socketpair, | |
264 | .accept = sock_no_accept, | |
265 | .getname = sock_no_getname, | |
266 | .poll = datagram_poll, | |
267 | .ioctl = sock_no_ioctl, | |
268 | .listen = sock_no_listen, | |
269 | .shutdown = sock_no_shutdown, | |
270 | .setsockopt = sock_no_setsockopt, | |
271 | .getsockopt = sock_no_getsockopt, | |
272 | .sendmsg = rawsock_sendmsg, | |
273 | .recvmsg = rawsock_recvmsg, | |
274 | .mmap = sock_no_mmap, | |
275 | }; | |
276 | ||
277 | static void rawsock_destruct(struct sock *sk) | |
278 | { | |
20c239c1 | 279 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
280 | |
281 | if (sk->sk_state == TCP_ESTABLISHED) { | |
282 | nfc_deactivate_target(nfc_rawsock(sk)->dev, | |
0a40acb2 | 283 | nfc_rawsock(sk)->target_idx); |
23b7869c LRV |
284 | nfc_put_device(nfc_rawsock(sk)->dev); |
285 | } | |
286 | ||
287 | skb_queue_purge(&sk->sk_receive_queue); | |
288 | ||
289 | if (!sock_flag(sk, SOCK_DEAD)) { | |
ed1e0ad8 | 290 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
23b7869c LRV |
291 | return; |
292 | } | |
293 | } | |
294 | ||
295 | static int rawsock_create(struct net *net, struct socket *sock, | |
0a40acb2 | 296 | const struct nfc_protocol *nfc_proto) |
23b7869c LRV |
297 | { |
298 | struct sock *sk; | |
299 | ||
20c239c1 | 300 | pr_debug("sock=%p\n", sock); |
23b7869c LRV |
301 | |
302 | if (sock->type != SOCK_SEQPACKET) | |
303 | return -ESOCKTNOSUPPORT; | |
304 | ||
305 | sock->ops = &rawsock_ops; | |
306 | ||
db81a624 | 307 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); |
23b7869c LRV |
308 | if (!sk) |
309 | return -ENOMEM; | |
310 | ||
311 | sock_init_data(sock, sk); | |
312 | sk->sk_protocol = nfc_proto->id; | |
313 | sk->sk_destruct = rawsock_destruct; | |
314 | sock->state = SS_UNCONNECTED; | |
315 | ||
316 | INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); | |
317 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static struct proto rawsock_proto = { | |
323 | .name = "NFC_RAW", | |
324 | .owner = THIS_MODULE, | |
325 | .obj_size = sizeof(struct nfc_rawsock), | |
326 | }; | |
327 | ||
328 | static const struct nfc_protocol rawsock_nfc_proto = { | |
329 | .id = NFC_SOCKPROTO_RAW, | |
330 | .proto = &rawsock_proto, | |
331 | .owner = THIS_MODULE, | |
332 | .create = rawsock_create | |
333 | }; | |
334 | ||
335 | int __init rawsock_init(void) | |
336 | { | |
337 | int rc; | |
338 | ||
339 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
340 | ||
341 | return rc; | |
342 | } | |
343 | ||
344 | void rawsock_exit(void) | |
345 | { | |
346 | nfc_proto_unregister(&rawsock_nfc_proto); | |
347 | } |