Commit | Line | Data |
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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 | ||
57be1f3f HT |
30 | static struct nfc_sock_list raw_sk_list = { |
31 | .lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock) | |
32 | }; | |
33 | ||
db3287da | 34 | static void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk) |
57be1f3f HT |
35 | { |
36 | write_lock(&l->lock); | |
37 | sk_add_node(sk, &l->head); | |
38 | write_unlock(&l->lock); | |
39 | } | |
40 | ||
db3287da | 41 | static void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk) |
57be1f3f HT |
42 | { |
43 | write_lock(&l->lock); | |
44 | sk_del_node_init(sk); | |
45 | write_unlock(&l->lock); | |
46 | } | |
47 | ||
23b7869c LRV |
48 | static void rawsock_write_queue_purge(struct sock *sk) |
49 | { | |
20c239c1 | 50 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
51 | |
52 | spin_lock_bh(&sk->sk_write_queue.lock); | |
53 | __skb_queue_purge(&sk->sk_write_queue); | |
54 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
55 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
56 | } | |
57 | ||
58 | static void rawsock_report_error(struct sock *sk, int err) | |
59 | { | |
20c239c1 | 60 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
61 | |
62 | sk->sk_shutdown = SHUTDOWN_MASK; | |
63 | sk->sk_err = -err; | |
64 | sk->sk_error_report(sk); | |
65 | ||
66 | rawsock_write_queue_purge(sk); | |
67 | } | |
68 | ||
69 | static int rawsock_release(struct socket *sock) | |
70 | { | |
71 | struct sock *sk = sock->sk; | |
72 | ||
03e934f6 ED |
73 | pr_debug("sock=%p sk=%p\n", sock, sk); |
74 | ||
75 | if (!sk) | |
76 | return 0; | |
23b7869c | 77 | |
57be1f3f HT |
78 | if (sock->type == SOCK_RAW) |
79 | nfc_sock_unlink(&raw_sk_list, sk); | |
80 | ||
23b7869c LRV |
81 | sock_orphan(sk); |
82 | sock_put(sk); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, | |
0a40acb2 | 88 | int len, int flags) |
23b7869c LRV |
89 | { |
90 | struct sock *sk = sock->sk; | |
91 | struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; | |
92 | struct nfc_dev *dev; | |
93 | int rc = 0; | |
94 | ||
20c239c1 | 95 | pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); |
23b7869c LRV |
96 | |
97 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
0a40acb2 | 98 | addr->sa_family != AF_NFC) |
23b7869c LRV |
99 | return -EINVAL; |
100 | ||
20c239c1 JP |
101 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", |
102 | addr->dev_idx, addr->target_idx, addr->nfc_protocol); | |
23b7869c LRV |
103 | |
104 | lock_sock(sk); | |
105 | ||
106 | if (sock->state == SS_CONNECTED) { | |
107 | rc = -EISCONN; | |
108 | goto error; | |
109 | } | |
110 | ||
111 | dev = nfc_get_device(addr->dev_idx); | |
112 | if (!dev) { | |
113 | rc = -ENODEV; | |
114 | goto error; | |
115 | } | |
116 | ||
01ae0eea EL |
117 | if (addr->target_idx > dev->target_next_idx - 1 || |
118 | addr->target_idx < dev->target_next_idx - dev->n_targets) { | |
c4fbb651 SO |
119 | rc = -EINVAL; |
120 | goto error; | |
121 | } | |
122 | ||
23b7869c LRV |
123 | rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); |
124 | if (rc) | |
125 | goto put_dev; | |
126 | ||
127 | nfc_rawsock(sk)->dev = dev; | |
128 | nfc_rawsock(sk)->target_idx = addr->target_idx; | |
129 | sock->state = SS_CONNECTED; | |
130 | sk->sk_state = TCP_ESTABLISHED; | |
131 | sk->sk_state_change(sk); | |
132 | ||
133 | release_sock(sk); | |
134 | return 0; | |
135 | ||
136 | put_dev: | |
137 | nfc_put_device(dev); | |
138 | error: | |
139 | release_sock(sk); | |
140 | return rc; | |
141 | } | |
142 | ||
143 | static int rawsock_add_header(struct sk_buff *skb) | |
144 | { | |
e8753043 | 145 | *skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
146 | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
0a40acb2 | 151 | int err) |
23b7869c LRV |
152 | { |
153 | struct sock *sk = (struct sock *) context; | |
154 | ||
155 | BUG_ON(in_irq()); | |
156 | ||
20c239c1 | 157 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
158 | |
159 | if (err) | |
160 | goto error; | |
161 | ||
162 | err = rawsock_add_header(skb); | |
163 | if (err) | |
4cf7e032 | 164 | goto error_skb; |
23b7869c LRV |
165 | |
166 | err = sock_queue_rcv_skb(sk, skb); | |
167 | if (err) | |
4cf7e032 | 168 | goto error_skb; |
23b7869c LRV |
169 | |
170 | spin_lock_bh(&sk->sk_write_queue.lock); | |
171 | if (!skb_queue_empty(&sk->sk_write_queue)) | |
172 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
173 | else | |
174 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
175 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
176 | ||
177 | sock_put(sk); | |
178 | return; | |
179 | ||
4cf7e032 TE |
180 | error_skb: |
181 | kfree_skb(skb); | |
182 | ||
23b7869c LRV |
183 | error: |
184 | rawsock_report_error(sk, err); | |
185 | sock_put(sk); | |
186 | } | |
187 | ||
188 | static void rawsock_tx_work(struct work_struct *work) | |
189 | { | |
190 | struct sock *sk = to_rawsock_sk(work); | |
191 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; | |
192 | u32 target_idx = nfc_rawsock(sk)->target_idx; | |
193 | struct sk_buff *skb; | |
194 | int rc; | |
195 | ||
20c239c1 | 196 | pr_debug("sk=%p target_idx=%u\n", sk, target_idx); |
23b7869c LRV |
197 | |
198 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
199 | rawsock_write_queue_purge(sk); | |
200 | return; | |
201 | } | |
202 | ||
203 | skb = skb_dequeue(&sk->sk_write_queue); | |
204 | ||
205 | sock_hold(sk); | |
206 | rc = nfc_data_exchange(dev, target_idx, skb, | |
0a40acb2 | 207 | rawsock_data_exchange_complete, sk); |
23b7869c LRV |
208 | if (rc) { |
209 | rawsock_report_error(sk, rc); | |
210 | sock_put(sk); | |
211 | } | |
212 | } | |
213 | ||
1b784140 | 214 | static int rawsock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
23b7869c LRV |
215 | { |
216 | struct sock *sk = sock->sk; | |
e8753043 | 217 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; |
23b7869c LRV |
218 | struct sk_buff *skb; |
219 | int rc; | |
220 | ||
20c239c1 | 221 | pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); |
23b7869c LRV |
222 | |
223 | if (msg->msg_namelen) | |
224 | return -EOPNOTSUPP; | |
225 | ||
226 | if (sock->state != SS_CONNECTED) | |
227 | return -ENOTCONN; | |
228 | ||
7c7cd3bf SO |
229 | skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); |
230 | if (skb == NULL) | |
23b7869c LRV |
231 | return rc; |
232 | ||
6ce8e9ce | 233 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
23b7869c LRV |
234 | if (rc < 0) { |
235 | kfree_skb(skb); | |
236 | return rc; | |
237 | } | |
238 | ||
239 | spin_lock_bh(&sk->sk_write_queue.lock); | |
240 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
241 | if (!nfc_rawsock(sk)->tx_work_scheduled) { | |
242 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
243 | nfc_rawsock(sk)->tx_work_scheduled = true; | |
244 | } | |
245 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
246 | ||
247 | return len; | |
248 | } | |
249 | ||
1b784140 YX |
250 | static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
251 | int flags) | |
23b7869c LRV |
252 | { |
253 | int noblock = flags & MSG_DONTWAIT; | |
254 | struct sock *sk = sock->sk; | |
255 | struct sk_buff *skb; | |
256 | int copied; | |
257 | int rc; | |
258 | ||
20c239c1 | 259 | pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); |
23b7869c LRV |
260 | |
261 | skb = skb_recv_datagram(sk, flags, noblock, &rc); | |
262 | if (!skb) | |
263 | return rc; | |
264 | ||
23b7869c LRV |
265 | copied = skb->len; |
266 | if (len < copied) { | |
267 | msg->msg_flags |= MSG_TRUNC; | |
268 | copied = len; | |
269 | } | |
270 | ||
51f3d02b | 271 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
23b7869c LRV |
272 | |
273 | skb_free_datagram(sk, skb); | |
274 | ||
275 | return rc ? : copied; | |
276 | } | |
277 | ||
23b7869c LRV |
278 | static const struct proto_ops rawsock_ops = { |
279 | .family = PF_NFC, | |
280 | .owner = THIS_MODULE, | |
281 | .release = rawsock_release, | |
282 | .bind = sock_no_bind, | |
283 | .connect = rawsock_connect, | |
284 | .socketpair = sock_no_socketpair, | |
285 | .accept = sock_no_accept, | |
286 | .getname = sock_no_getname, | |
287 | .poll = datagram_poll, | |
288 | .ioctl = sock_no_ioctl, | |
289 | .listen = sock_no_listen, | |
290 | .shutdown = sock_no_shutdown, | |
291 | .setsockopt = sock_no_setsockopt, | |
292 | .getsockopt = sock_no_getsockopt, | |
293 | .sendmsg = rawsock_sendmsg, | |
294 | .recvmsg = rawsock_recvmsg, | |
295 | .mmap = sock_no_mmap, | |
296 | }; | |
297 | ||
57be1f3f HT |
298 | static const struct proto_ops rawsock_raw_ops = { |
299 | .family = PF_NFC, | |
300 | .owner = THIS_MODULE, | |
301 | .release = rawsock_release, | |
302 | .bind = sock_no_bind, | |
303 | .connect = sock_no_connect, | |
304 | .socketpair = sock_no_socketpair, | |
305 | .accept = sock_no_accept, | |
306 | .getname = sock_no_getname, | |
307 | .poll = datagram_poll, | |
308 | .ioctl = sock_no_ioctl, | |
309 | .listen = sock_no_listen, | |
310 | .shutdown = sock_no_shutdown, | |
311 | .setsockopt = sock_no_setsockopt, | |
312 | .getsockopt = sock_no_getsockopt, | |
313 | .sendmsg = sock_no_sendmsg, | |
314 | .recvmsg = rawsock_recvmsg, | |
315 | .mmap = sock_no_mmap, | |
316 | }; | |
317 | ||
23b7869c LRV |
318 | static void rawsock_destruct(struct sock *sk) |
319 | { | |
20c239c1 | 320 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
321 | |
322 | if (sk->sk_state == TCP_ESTABLISHED) { | |
323 | nfc_deactivate_target(nfc_rawsock(sk)->dev, | |
96d4581f CR |
324 | nfc_rawsock(sk)->target_idx, |
325 | NFC_TARGET_MODE_IDLE); | |
23b7869c LRV |
326 | nfc_put_device(nfc_rawsock(sk)->dev); |
327 | } | |
328 | ||
329 | skb_queue_purge(&sk->sk_receive_queue); | |
330 | ||
331 | if (!sock_flag(sk, SOCK_DEAD)) { | |
ed1e0ad8 | 332 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
23b7869c LRV |
333 | return; |
334 | } | |
335 | } | |
336 | ||
337 | static int rawsock_create(struct net *net, struct socket *sock, | |
11aa9c28 | 338 | const struct nfc_protocol *nfc_proto, int kern) |
23b7869c LRV |
339 | { |
340 | struct sock *sk; | |
341 | ||
20c239c1 | 342 | pr_debug("sock=%p\n", sock); |
23b7869c | 343 | |
57be1f3f | 344 | if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW)) |
23b7869c LRV |
345 | return -ESOCKTNOSUPPORT; |
346 | ||
57be1f3f HT |
347 | if (sock->type == SOCK_RAW) |
348 | sock->ops = &rawsock_raw_ops; | |
349 | else | |
350 | sock->ops = &rawsock_ops; | |
23b7869c | 351 | |
11aa9c28 | 352 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern); |
23b7869c LRV |
353 | if (!sk) |
354 | return -ENOMEM; | |
355 | ||
356 | sock_init_data(sock, sk); | |
357 | sk->sk_protocol = nfc_proto->id; | |
358 | sk->sk_destruct = rawsock_destruct; | |
359 | sock->state = SS_UNCONNECTED; | |
57be1f3f HT |
360 | if (sock->type == SOCK_RAW) |
361 | nfc_sock_link(&raw_sk_list, sk); | |
362 | else { | |
363 | INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); | |
364 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
365 | } | |
23b7869c LRV |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
57be1f3f HT |
370 | void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb, |
371 | u8 payload_type, u8 direction) | |
372 | { | |
373 | struct sk_buff *skb_copy = NULL, *nskb; | |
374 | struct sock *sk; | |
375 | u8 *data; | |
376 | ||
377 | read_lock(&raw_sk_list.lock); | |
378 | ||
379 | sk_for_each(sk, &raw_sk_list.head) { | |
380 | if (!skb_copy) { | |
bad93e9d OP |
381 | skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, |
382 | GFP_ATOMIC, true); | |
57be1f3f HT |
383 | if (!skb_copy) |
384 | continue; | |
385 | ||
386 | data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); | |
387 | ||
388 | data[0] = dev ? dev->idx : 0xFF; | |
389 | data[1] = direction & 0x01; | |
390 | data[1] |= (payload_type << 1); | |
391 | } | |
392 | ||
393 | nskb = skb_clone(skb_copy, GFP_ATOMIC); | |
394 | if (!nskb) | |
395 | continue; | |
396 | ||
397 | if (sock_queue_rcv_skb(sk, nskb)) | |
398 | kfree_skb(nskb); | |
399 | } | |
400 | ||
401 | read_unlock(&raw_sk_list.lock); | |
402 | ||
403 | kfree_skb(skb_copy); | |
404 | } | |
405 | EXPORT_SYMBOL(nfc_send_to_raw_sock); | |
406 | ||
23b7869c LRV |
407 | static struct proto rawsock_proto = { |
408 | .name = "NFC_RAW", | |
409 | .owner = THIS_MODULE, | |
410 | .obj_size = sizeof(struct nfc_rawsock), | |
411 | }; | |
412 | ||
413 | static const struct nfc_protocol rawsock_nfc_proto = { | |
414 | .id = NFC_SOCKPROTO_RAW, | |
415 | .proto = &rawsock_proto, | |
416 | .owner = THIS_MODULE, | |
417 | .create = rawsock_create | |
418 | }; | |
419 | ||
420 | int __init rawsock_init(void) | |
421 | { | |
422 | int rc; | |
423 | ||
424 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
425 | ||
426 | return rc; | |
427 | } | |
428 | ||
429 | void rawsock_exit(void) | |
430 | { | |
431 | nfc_proto_unregister(&rawsock_nfc_proto); | |
432 | } |