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Commit | Line | Data |
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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
23b7869c LRV |
2 | /* |
3 | * Copyright (C) 2011 Instituto Nokia de Tecnologia | |
4 | * | |
5 | * Authors: | |
6 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> | |
7 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> | |
23b7869c LRV |
8 | */ |
9 | ||
52858b51 | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 11 | |
23b7869c LRV |
12 | #include <net/tcp_states.h> |
13 | #include <linux/nfc.h> | |
bc3b2d7f | 14 | #include <linux/export.h> |
23b7869c LRV |
15 | |
16 | #include "nfc.h" | |
17 | ||
57be1f3f HT |
18 | static struct nfc_sock_list raw_sk_list = { |
19 | .lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock) | |
20 | }; | |
21 | ||
db3287da | 22 | static void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk) |
57be1f3f HT |
23 | { |
24 | write_lock(&l->lock); | |
25 | sk_add_node(sk, &l->head); | |
26 | write_unlock(&l->lock); | |
27 | } | |
28 | ||
db3287da | 29 | static void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk) |
57be1f3f HT |
30 | { |
31 | write_lock(&l->lock); | |
32 | sk_del_node_init(sk); | |
33 | write_unlock(&l->lock); | |
34 | } | |
35 | ||
23b7869c LRV |
36 | static void rawsock_write_queue_purge(struct sock *sk) |
37 | { | |
20c239c1 | 38 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
39 | |
40 | spin_lock_bh(&sk->sk_write_queue.lock); | |
41 | __skb_queue_purge(&sk->sk_write_queue); | |
42 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
43 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
44 | } | |
45 | ||
46 | static void rawsock_report_error(struct sock *sk, int err) | |
47 | { | |
20c239c1 | 48 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
49 | |
50 | sk->sk_shutdown = SHUTDOWN_MASK; | |
51 | sk->sk_err = -err; | |
52 | sk->sk_error_report(sk); | |
53 | ||
54 | rawsock_write_queue_purge(sk); | |
55 | } | |
56 | ||
57 | static int rawsock_release(struct socket *sock) | |
58 | { | |
59 | struct sock *sk = sock->sk; | |
60 | ||
03e934f6 ED |
61 | pr_debug("sock=%p sk=%p\n", sock, sk); |
62 | ||
63 | if (!sk) | |
64 | return 0; | |
23b7869c | 65 | |
57be1f3f HT |
66 | if (sock->type == SOCK_RAW) |
67 | nfc_sock_unlink(&raw_sk_list, sk); | |
68 | ||
23b7869c LRV |
69 | sock_orphan(sk); |
70 | sock_put(sk); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, | |
0a40acb2 | 76 | int len, int flags) |
23b7869c LRV |
77 | { |
78 | struct sock *sk = sock->sk; | |
79 | struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; | |
80 | struct nfc_dev *dev; | |
81 | int rc = 0; | |
82 | ||
20c239c1 | 83 | pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); |
23b7869c LRV |
84 | |
85 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
0a40acb2 | 86 | addr->sa_family != AF_NFC) |
23b7869c LRV |
87 | return -EINVAL; |
88 | ||
20c239c1 JP |
89 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", |
90 | addr->dev_idx, addr->target_idx, addr->nfc_protocol); | |
23b7869c LRV |
91 | |
92 | lock_sock(sk); | |
93 | ||
94 | if (sock->state == SS_CONNECTED) { | |
95 | rc = -EISCONN; | |
96 | goto error; | |
97 | } | |
98 | ||
99 | dev = nfc_get_device(addr->dev_idx); | |
100 | if (!dev) { | |
101 | rc = -ENODEV; | |
102 | goto error; | |
103 | } | |
104 | ||
01ae0eea EL |
105 | if (addr->target_idx > dev->target_next_idx - 1 || |
106 | addr->target_idx < dev->target_next_idx - dev->n_targets) { | |
c4fbb651 SO |
107 | rc = -EINVAL; |
108 | goto error; | |
109 | } | |
110 | ||
23b7869c LRV |
111 | rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); |
112 | if (rc) | |
113 | goto put_dev; | |
114 | ||
115 | nfc_rawsock(sk)->dev = dev; | |
116 | nfc_rawsock(sk)->target_idx = addr->target_idx; | |
117 | sock->state = SS_CONNECTED; | |
118 | sk->sk_state = TCP_ESTABLISHED; | |
119 | sk->sk_state_change(sk); | |
120 | ||
121 | release_sock(sk); | |
122 | return 0; | |
123 | ||
124 | put_dev: | |
125 | nfc_put_device(dev); | |
126 | error: | |
127 | release_sock(sk); | |
128 | return rc; | |
129 | } | |
130 | ||
131 | static int rawsock_add_header(struct sk_buff *skb) | |
132 | { | |
d58ff351 | 133 | *(u8 *)skb_push(skb, NFC_HEADER_SIZE) = 0; |
23b7869c LRV |
134 | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, | |
0a40acb2 | 139 | int err) |
23b7869c LRV |
140 | { |
141 | struct sock *sk = (struct sock *) context; | |
142 | ||
143 | BUG_ON(in_irq()); | |
144 | ||
20c239c1 | 145 | pr_debug("sk=%p err=%d\n", sk, err); |
23b7869c LRV |
146 | |
147 | if (err) | |
148 | goto error; | |
149 | ||
150 | err = rawsock_add_header(skb); | |
151 | if (err) | |
4cf7e032 | 152 | goto error_skb; |
23b7869c LRV |
153 | |
154 | err = sock_queue_rcv_skb(sk, skb); | |
155 | if (err) | |
4cf7e032 | 156 | goto error_skb; |
23b7869c LRV |
157 | |
158 | spin_lock_bh(&sk->sk_write_queue.lock); | |
159 | if (!skb_queue_empty(&sk->sk_write_queue)) | |
160 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
161 | else | |
162 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
163 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
164 | ||
165 | sock_put(sk); | |
166 | return; | |
167 | ||
4cf7e032 TE |
168 | error_skb: |
169 | kfree_skb(skb); | |
170 | ||
23b7869c LRV |
171 | error: |
172 | rawsock_report_error(sk, err); | |
173 | sock_put(sk); | |
174 | } | |
175 | ||
176 | static void rawsock_tx_work(struct work_struct *work) | |
177 | { | |
178 | struct sock *sk = to_rawsock_sk(work); | |
179 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; | |
180 | u32 target_idx = nfc_rawsock(sk)->target_idx; | |
181 | struct sk_buff *skb; | |
182 | int rc; | |
183 | ||
20c239c1 | 184 | pr_debug("sk=%p target_idx=%u\n", sk, target_idx); |
23b7869c LRV |
185 | |
186 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
187 | rawsock_write_queue_purge(sk); | |
188 | return; | |
189 | } | |
190 | ||
191 | skb = skb_dequeue(&sk->sk_write_queue); | |
192 | ||
193 | sock_hold(sk); | |
194 | rc = nfc_data_exchange(dev, target_idx, skb, | |
0a40acb2 | 195 | rawsock_data_exchange_complete, sk); |
23b7869c LRV |
196 | if (rc) { |
197 | rawsock_report_error(sk, rc); | |
198 | sock_put(sk); | |
199 | } | |
200 | } | |
201 | ||
1b784140 | 202 | static int rawsock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
23b7869c LRV |
203 | { |
204 | struct sock *sk = sock->sk; | |
e8753043 | 205 | struct nfc_dev *dev = nfc_rawsock(sk)->dev; |
23b7869c LRV |
206 | struct sk_buff *skb; |
207 | int rc; | |
208 | ||
20c239c1 | 209 | pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); |
23b7869c LRV |
210 | |
211 | if (msg->msg_namelen) | |
212 | return -EOPNOTSUPP; | |
213 | ||
214 | if (sock->state != SS_CONNECTED) | |
215 | return -ENOTCONN; | |
216 | ||
7c7cd3bf SO |
217 | skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); |
218 | if (skb == NULL) | |
23b7869c LRV |
219 | return rc; |
220 | ||
6ce8e9ce | 221 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
23b7869c LRV |
222 | if (rc < 0) { |
223 | kfree_skb(skb); | |
224 | return rc; | |
225 | } | |
226 | ||
227 | spin_lock_bh(&sk->sk_write_queue.lock); | |
228 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
229 | if (!nfc_rawsock(sk)->tx_work_scheduled) { | |
230 | schedule_work(&nfc_rawsock(sk)->tx_work); | |
231 | nfc_rawsock(sk)->tx_work_scheduled = true; | |
232 | } | |
233 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
234 | ||
235 | return len; | |
236 | } | |
237 | ||
1b784140 YX |
238 | static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
239 | int flags) | |
23b7869c LRV |
240 | { |
241 | int noblock = flags & MSG_DONTWAIT; | |
242 | struct sock *sk = sock->sk; | |
243 | struct sk_buff *skb; | |
244 | int copied; | |
245 | int rc; | |
246 | ||
20c239c1 | 247 | pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); |
23b7869c LRV |
248 | |
249 | skb = skb_recv_datagram(sk, flags, noblock, &rc); | |
250 | if (!skb) | |
251 | return rc; | |
252 | ||
23b7869c LRV |
253 | copied = skb->len; |
254 | if (len < copied) { | |
255 | msg->msg_flags |= MSG_TRUNC; | |
256 | copied = len; | |
257 | } | |
258 | ||
51f3d02b | 259 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
23b7869c LRV |
260 | |
261 | skb_free_datagram(sk, skb); | |
262 | ||
263 | return rc ? : copied; | |
264 | } | |
265 | ||
23b7869c LRV |
266 | static const struct proto_ops rawsock_ops = { |
267 | .family = PF_NFC, | |
268 | .owner = THIS_MODULE, | |
269 | .release = rawsock_release, | |
270 | .bind = sock_no_bind, | |
271 | .connect = rawsock_connect, | |
272 | .socketpair = sock_no_socketpair, | |
273 | .accept = sock_no_accept, | |
274 | .getname = sock_no_getname, | |
a11e1d43 | 275 | .poll = datagram_poll, |
23b7869c LRV |
276 | .ioctl = sock_no_ioctl, |
277 | .listen = sock_no_listen, | |
278 | .shutdown = sock_no_shutdown, | |
23b7869c LRV |
279 | .sendmsg = rawsock_sendmsg, |
280 | .recvmsg = rawsock_recvmsg, | |
281 | .mmap = sock_no_mmap, | |
282 | }; | |
283 | ||
57be1f3f HT |
284 | static const struct proto_ops rawsock_raw_ops = { |
285 | .family = PF_NFC, | |
286 | .owner = THIS_MODULE, | |
287 | .release = rawsock_release, | |
288 | .bind = sock_no_bind, | |
289 | .connect = sock_no_connect, | |
290 | .socketpair = sock_no_socketpair, | |
291 | .accept = sock_no_accept, | |
292 | .getname = sock_no_getname, | |
a11e1d43 | 293 | .poll = datagram_poll, |
57be1f3f HT |
294 | .ioctl = sock_no_ioctl, |
295 | .listen = sock_no_listen, | |
296 | .shutdown = sock_no_shutdown, | |
57be1f3f HT |
297 | .sendmsg = sock_no_sendmsg, |
298 | .recvmsg = rawsock_recvmsg, | |
299 | .mmap = sock_no_mmap, | |
300 | }; | |
301 | ||
23b7869c LRV |
302 | static void rawsock_destruct(struct sock *sk) |
303 | { | |
20c239c1 | 304 | pr_debug("sk=%p\n", sk); |
23b7869c LRV |
305 | |
306 | if (sk->sk_state == TCP_ESTABLISHED) { | |
307 | nfc_deactivate_target(nfc_rawsock(sk)->dev, | |
96d4581f CR |
308 | nfc_rawsock(sk)->target_idx, |
309 | NFC_TARGET_MODE_IDLE); | |
23b7869c LRV |
310 | nfc_put_device(nfc_rawsock(sk)->dev); |
311 | } | |
312 | ||
313 | skb_queue_purge(&sk->sk_receive_queue); | |
314 | ||
315 | if (!sock_flag(sk, SOCK_DEAD)) { | |
ed1e0ad8 | 316 | pr_err("Freeing alive NFC raw socket %p\n", sk); |
23b7869c LRV |
317 | return; |
318 | } | |
319 | } | |
320 | ||
321 | static int rawsock_create(struct net *net, struct socket *sock, | |
11aa9c28 | 322 | const struct nfc_protocol *nfc_proto, int kern) |
23b7869c LRV |
323 | { |
324 | struct sock *sk; | |
325 | ||
20c239c1 | 326 | pr_debug("sock=%p\n", sock); |
23b7869c | 327 | |
57be1f3f | 328 | if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW)) |
23b7869c LRV |
329 | return -ESOCKTNOSUPPORT; |
330 | ||
26896f01 QL |
331 | if (sock->type == SOCK_RAW) { |
332 | if (!capable(CAP_NET_RAW)) | |
333 | return -EPERM; | |
57be1f3f | 334 | sock->ops = &rawsock_raw_ops; |
26896f01 | 335 | } else { |
57be1f3f | 336 | sock->ops = &rawsock_ops; |
26896f01 | 337 | } |
23b7869c | 338 | |
11aa9c28 | 339 | sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern); |
23b7869c LRV |
340 | if (!sk) |
341 | return -ENOMEM; | |
342 | ||
343 | sock_init_data(sock, sk); | |
344 | sk->sk_protocol = nfc_proto->id; | |
345 | sk->sk_destruct = rawsock_destruct; | |
346 | sock->state = SS_UNCONNECTED; | |
57be1f3f HT |
347 | if (sock->type == SOCK_RAW) |
348 | nfc_sock_link(&raw_sk_list, sk); | |
349 | else { | |
350 | INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); | |
351 | nfc_rawsock(sk)->tx_work_scheduled = false; | |
352 | } | |
23b7869c LRV |
353 | |
354 | return 0; | |
355 | } | |
356 | ||
57be1f3f HT |
357 | void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb, |
358 | u8 payload_type, u8 direction) | |
359 | { | |
360 | struct sk_buff *skb_copy = NULL, *nskb; | |
361 | struct sock *sk; | |
362 | u8 *data; | |
363 | ||
364 | read_lock(&raw_sk_list.lock); | |
365 | ||
366 | sk_for_each(sk, &raw_sk_list.head) { | |
367 | if (!skb_copy) { | |
bad93e9d OP |
368 | skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, |
369 | GFP_ATOMIC, true); | |
57be1f3f HT |
370 | if (!skb_copy) |
371 | continue; | |
372 | ||
373 | data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); | |
374 | ||
375 | data[0] = dev ? dev->idx : 0xFF; | |
376 | data[1] = direction & 0x01; | |
377 | data[1] |= (payload_type << 1); | |
378 | } | |
379 | ||
380 | nskb = skb_clone(skb_copy, GFP_ATOMIC); | |
381 | if (!nskb) | |
382 | continue; | |
383 | ||
384 | if (sock_queue_rcv_skb(sk, nskb)) | |
385 | kfree_skb(nskb); | |
386 | } | |
387 | ||
388 | read_unlock(&raw_sk_list.lock); | |
389 | ||
390 | kfree_skb(skb_copy); | |
391 | } | |
392 | EXPORT_SYMBOL(nfc_send_to_raw_sock); | |
393 | ||
23b7869c LRV |
394 | static struct proto rawsock_proto = { |
395 | .name = "NFC_RAW", | |
396 | .owner = THIS_MODULE, | |
397 | .obj_size = sizeof(struct nfc_rawsock), | |
398 | }; | |
399 | ||
400 | static const struct nfc_protocol rawsock_nfc_proto = { | |
401 | .id = NFC_SOCKPROTO_RAW, | |
402 | .proto = &rawsock_proto, | |
403 | .owner = THIS_MODULE, | |
404 | .create = rawsock_create | |
405 | }; | |
406 | ||
407 | int __init rawsock_init(void) | |
408 | { | |
409 | int rc; | |
410 | ||
411 | rc = nfc_proto_register(&rawsock_nfc_proto); | |
412 | ||
413 | return rc; | |
414 | } | |
415 | ||
416 | void rawsock_exit(void) | |
417 | { | |
418 | nfc_proto_unregister(&rawsock_nfc_proto); | |
419 | } |