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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 | |
98b32dec | 19 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23b7869c LRV |
20 | */ |
21 | ||
52858b51 | 22 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 23 | |
23b7869c LRV |
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 | { | |
20c239c1 | 32 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
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 | { | |
20c239c1 | 42 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
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 | ||
03e934f6 ED |
55 | pr_debug("sock=%p sk=%p\n", sock, sk); |
56 | ||
57 | if (!sk) | |
58 | return 0; | |
23b7869c LRV |
59 | |
60 | sock_orphan(sk); | |
61 | sock_put(sk); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, | |
0a40acb2 | 67 | int len, int flags) |
23b7869c LRV |
68 | { |
69 | struct sock *sk = sock->sk; | |
70 | struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; | |
71 | struct nfc_dev *dev; | |
72 | int rc = 0; | |
73 | ||
20c239c1 | 74 | pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); |
23b7869c LRV |
75 | |
76 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
0a40acb2 | 77 | addr->sa_family != AF_NFC) |
23b7869c LRV |
78 | return -EINVAL; |
79 | ||
20c239c1 JP |
80 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", |
81 | addr->dev_idx, addr->target_idx, addr->nfc_protocol); | |
23b7869c LRV |
82 | |
83 | lock_sock(sk); | |
84 | ||
85 | if (sock->state == SS_CONNECTED) { | |
86 | rc = -EISCONN; | |
87 | goto error; | |
88 | } | |
89 | ||
90 | dev = nfc_get_device(addr->dev_idx); | |
91 | if (!dev) { | |
92 | rc = -ENODEV; | |
93 | goto error; | |
94 | } | |
95 | ||
01ae0eea EL |
96 | if (addr->target_idx > dev->target_next_idx - 1 || |
97 | addr->target_idx < dev->target_next_idx - dev->n_targets) { | |
c4fbb651 SO |
98 | rc = -EINVAL; |
99 | goto error; | |
100 | } | |
101 | ||
23b7869c LRV |
102 | rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); |
103 | if (rc) | |
104 | goto put_dev; | |
105 | ||
106 | nfc_rawsock(sk)->dev = dev; | |
107 | nfc_rawsock(sk)->target_idx = addr->target_idx; | |
108 | sock->state = SS_CONNECTED; | |
109 | sk->sk_state = TCP_ESTABLISHED; | |
110 | sk->sk_state_change(sk); | |
111 | ||
112 | release_sock(sk); | |
113 | return 0; | |
114 | ||
115 | put_dev: | |
116 | nfc_put_device(dev); | |
117 | error: | |
118 | release_sock(sk); | |
119 | return rc; | |
120 | } | |
121 | ||
122 | static int rawsock_add_header(struct sk_buff *skb) | |
123 | { | |
e8753043 | 124 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
125 | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
0a40acb2 | 130 | int err) |
23b7869c LRV |
131 | { |
132 | struct sock *sk = (struct sock *) context; | |
133 | ||
134 | BUG_ON(in_irq()); | |
135 | ||
20c239c1 | 136 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
137 | |
138 | if (err) | |
139 | goto error; | |
140 | ||
141 | err = rawsock_add_header(skb); | |
142 | if (err) | |
4cf7e032 | 143 | goto error_skb; |
23b7869c LRV |
144 | |
145 | err = sock_queue_rcv_skb(sk, skb); | |
146 | if (err) | |
4cf7e032 | 147 | goto error_skb; |
23b7869c LRV |
148 | |
149 | spin_lock_bh(&sk->sk_write_queue.lock); | |
150 | if (!skb_queue_empty(&sk->sk_write_queue)) | |
151 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
152 | else | |
153 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
154 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
155 | ||
156 | sock_put(sk); | |
157 | return; | |
158 | ||
4cf7e032 TE |
159 | error_skb: |
160 | kfree_skb(skb); | |
161 | ||
23b7869c LRV |
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 | ||
20c239c1 | 175 | pr_debug("sk=%p target_idx=%u\n", sk, target_idx); |
23b7869c LRV |
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, | |
0a40acb2 | 186 | rawsock_data_exchange_complete, sk); |
23b7869c LRV |
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, | |
0a40acb2 | 194 | struct msghdr *msg, size_t len) |
23b7869c LRV |
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 | ||
20c239c1 | 201 | pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); |
23b7869c LRV |
202 | |
203 | if (msg->msg_namelen) | |
204 | return -EOPNOTSUPP; | |
205 | ||
206 | if (sock->state != SS_CONNECTED) | |
207 | return -ENOTCONN; | |
208 | ||
7c7cd3bf SO |
209 | skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); |
210 | if (skb == NULL) | |
23b7869c LRV |
211 | return rc; |
212 | ||
213 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
214 | if (rc < 0) { | |
215 | kfree_skb(skb); | |
216 | return rc; | |
217 | } | |
218 | ||
219 | spin_lock_bh(&sk->sk_write_queue.lock); | |
220 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
221 | if (!nfc_rawsock(sk)->tx_work_scheduled) { | |
222 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
223 | nfc_rawsock(sk)->tx_work_scheduled = true; | |
224 | } | |
225 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
226 | ||
227 | return len; | |
228 | } | |
229 | ||
230 | static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
0a40acb2 | 231 | struct msghdr *msg, size_t len, int flags) |
23b7869c LRV |
232 | { |
233 | int noblock = flags & MSG_DONTWAIT; | |
234 | struct sock *sk = sock->sk; | |
235 | struct sk_buff *skb; | |
236 | int copied; | |
237 | int rc; | |
238 | ||
20c239c1 | 239 | pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); |
23b7869c LRV |
240 | |
241 | skb = skb_recv_datagram(sk, flags, noblock, &rc); | |
242 | if (!skb) | |
243 | return rc; | |
244 | ||
23b7869c LRV |
245 | copied = skb->len; |
246 | if (len < copied) { | |
247 | msg->msg_flags |= MSG_TRUNC; | |
248 | copied = len; | |
249 | } | |
250 | ||
251 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
252 | ||
253 | skb_free_datagram(sk, skb); | |
254 | ||
255 | return rc ? : copied; | |
256 | } | |
257 | ||
23b7869c LRV |
258 | static const struct proto_ops rawsock_ops = { |
259 | .family = PF_NFC, | |
260 | .owner = THIS_MODULE, | |
261 | .release = rawsock_release, | |
262 | .bind = sock_no_bind, | |
263 | .connect = rawsock_connect, | |
264 | .socketpair = sock_no_socketpair, | |
265 | .accept = sock_no_accept, | |
266 | .getname = sock_no_getname, | |
267 | .poll = datagram_poll, | |
268 | .ioctl = sock_no_ioctl, | |
269 | .listen = sock_no_listen, | |
270 | .shutdown = sock_no_shutdown, | |
271 | .setsockopt = sock_no_setsockopt, | |
272 | .getsockopt = sock_no_getsockopt, | |
273 | .sendmsg = rawsock_sendmsg, | |
274 | .recvmsg = rawsock_recvmsg, | |
275 | .mmap = sock_no_mmap, | |
276 | }; | |
277 | ||
278 | static void rawsock_destruct(struct sock *sk) | |
279 | { | |
20c239c1 | 280 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
281 | |
282 | if (sk->sk_state == TCP_ESTABLISHED) { | |
283 | nfc_deactivate_target(nfc_rawsock(sk)->dev, | |
0a40acb2 | 284 | nfc_rawsock(sk)->target_idx); |
23b7869c LRV |
285 | nfc_put_device(nfc_rawsock(sk)->dev); |
286 | } | |
287 | ||
288 | skb_queue_purge(&sk->sk_receive_queue); | |
289 | ||
290 | if (!sock_flag(sk, SOCK_DEAD)) { | |
ed1e0ad8 | 291 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
23b7869c LRV |
292 | return; |
293 | } | |
294 | } | |
295 | ||
296 | static int rawsock_create(struct net *net, struct socket *sock, | |
0a40acb2 | 297 | const struct nfc_protocol *nfc_proto) |
23b7869c LRV |
298 | { |
299 | struct sock *sk; | |
300 | ||
20c239c1 | 301 | pr_debug("sock=%p\n", sock); |
23b7869c LRV |
302 | |
303 | if (sock->type != SOCK_SEQPACKET) | |
304 | return -ESOCKTNOSUPPORT; | |
305 | ||
306 | sock->ops = &rawsock_ops; | |
307 | ||
db81a624 | 308 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); |
23b7869c LRV |
309 | if (!sk) |
310 | return -ENOMEM; | |
311 | ||
312 | sock_init_data(sock, sk); | |
313 | sk->sk_protocol = nfc_proto->id; | |
314 | sk->sk_destruct = rawsock_destruct; | |
315 | sock->state = SS_UNCONNECTED; | |
316 | ||
317 | INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); | |
318 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static struct proto rawsock_proto = { | |
324 | .name = "NFC_RAW", | |
325 | .owner = THIS_MODULE, | |
326 | .obj_size = sizeof(struct nfc_rawsock), | |
327 | }; | |
328 | ||
329 | static const struct nfc_protocol rawsock_nfc_proto = { | |
330 | .id = NFC_SOCKPROTO_RAW, | |
331 | .proto = &rawsock_proto, | |
332 | .owner = THIS_MODULE, | |
333 | .create = rawsock_create | |
334 | }; | |
335 | ||
336 | int __init rawsock_init(void) | |
337 | { | |
338 | int rc; | |
339 | ||
340 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
341 | ||
342 | return rc; | |
343 | } | |
344 | ||
345 | void rawsock_exit(void) | |
346 | { | |
347 | nfc_proto_unregister(&rawsock_nfc_proto); | |
348 | } |