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24#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26#include <net/tcp_states.h>
27#include <linux/nfc.h>
28#include <linux/export.h>
29
30#include "nfc.h"
31
32static void rawsock_write_queue_purge(struct sock *sk)
33{
34 pr_debug("sk=%p\n", sk);
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
42static void rawsock_report_error(struct sock *sk, int err)
43{
44 pr_debug("sk=%p err=%d\n", sk, err);
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
53static int rawsock_release(struct socket *sock)
54{
55 struct sock *sk = sock->sk;
56
57 pr_debug("sock=%p\n", sock);
58
59 sock_orphan(sk);
60 sock_put(sk);
61
62 return 0;
63}
64
65static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
66 int len, int flags)
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
73 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
74
75 if (!addr || len < sizeof(struct sockaddr_nfc) ||
76 addr->sa_family != AF_NFC)
77 return -EINVAL;
78
79 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
80 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
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
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
101 if (addr->target_idx > dev->target_idx - 1 ||
102 addr->target_idx < dev->target_idx - dev->n_targets) {
103 rc = -EINVAL;
104 goto error;
105 }
106
107 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
108 if (rc)
109 goto put_dev;
110
111 nfc_rawsock(sk)->dev = dev;
112 nfc_rawsock(sk)->target_idx = addr->target_idx;
113 sock->state = SS_CONNECTED;
114 sk->sk_state = TCP_ESTABLISHED;
115 sk->sk_state_change(sk);
116
117 release_sock(sk);
118 return 0;
119
120put_dev:
121 nfc_put_device(dev);
122error:
123 release_sock(sk);
124 return rc;
125}
126
127static int rawsock_add_header(struct sk_buff *skb)
128{
129 *skb_push(skb, NFC_HEADER_SIZE) = 0;
130
131 return 0;
132}
133
134static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
135 int err)
136{
137 struct sock *sk = (struct sock *) context;
138
139 BUG_ON(in_irq());
140
141 pr_debug("sk=%p err=%d\n", sk, err);
142
143 if (err)
144 goto error;
145
146 err = rawsock_add_header(skb);
147 if (err)
148 goto error;
149
150 err = sock_queue_rcv_skb(sk, skb);
151 if (err)
152 goto error;
153
154 spin_lock_bh(&sk->sk_write_queue.lock);
155 if (!skb_queue_empty(&sk->sk_write_queue))
156 schedule_work(&nfc_rawsock(sk)->tx_work);
157 else
158 nfc_rawsock(sk)->tx_work_scheduled = false;
159 spin_unlock_bh(&sk->sk_write_queue.lock);
160
161 sock_put(sk);
162 return;
163
164error:
165 rawsock_report_error(sk, err);
166 sock_put(sk);
167}
168
169static void rawsock_tx_work(struct work_struct *work)
170{
171 struct sock *sk = to_rawsock_sk(work);
172 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
173 u32 target_idx = nfc_rawsock(sk)->target_idx;
174 struct sk_buff *skb;
175 int rc;
176
177 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
178
179 if (sk->sk_shutdown & SEND_SHUTDOWN) {
180 rawsock_write_queue_purge(sk);
181 return;
182 }
183
184 skb = skb_dequeue(&sk->sk_write_queue);
185
186 sock_hold(sk);
187 rc = nfc_data_exchange(dev, target_idx, skb,
188 rawsock_data_exchange_complete, sk);
189 if (rc) {
190 rawsock_report_error(sk, rc);
191 sock_put(sk);
192 }
193}
194
195static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
196 struct msghdr *msg, size_t len)
197{
198 struct sock *sk = sock->sk;
199 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
200 struct sk_buff *skb;
201 int rc;
202
203 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
204
205 if (msg->msg_namelen)
206 return -EOPNOTSUPP;
207
208 if (sock->state != SS_CONNECTED)
209 return -ENOTCONN;
210
211 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
212 if (skb == NULL)
213 return rc;
214
215 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
216 if (rc < 0) {
217 kfree_skb(skb);
218 return rc;
219 }
220
221 spin_lock_bh(&sk->sk_write_queue.lock);
222 __skb_queue_tail(&sk->sk_write_queue, skb);
223 if (!nfc_rawsock(sk)->tx_work_scheduled) {
224 schedule_work(&nfc_rawsock(sk)->tx_work);
225 nfc_rawsock(sk)->tx_work_scheduled = true;
226 }
227 spin_unlock_bh(&sk->sk_write_queue.lock);
228
229 return len;
230}
231
232static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
233 struct msghdr *msg, size_t len, int flags)
234{
235 int noblock = flags & MSG_DONTWAIT;
236 struct sock *sk = sock->sk;
237 struct sk_buff *skb;
238 int copied;
239 int rc;
240
241 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
242
243 skb = skb_recv_datagram(sk, flags, noblock, &rc);
244 if (!skb)
245 return rc;
246
247 msg->msg_namelen = 0;
248
249 copied = skb->len;
250 if (len < copied) {
251 msg->msg_flags |= MSG_TRUNC;
252 copied = len;
253 }
254
255 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
256
257 skb_free_datagram(sk, skb);
258
259 return rc ? : copied;
260}
261
262
263static const struct proto_ops rawsock_ops = {
264 .family = PF_NFC,
265 .owner = THIS_MODULE,
266 .release = rawsock_release,
267 .bind = sock_no_bind,
268 .connect = rawsock_connect,
269 .socketpair = sock_no_socketpair,
270 .accept = sock_no_accept,
271 .getname = sock_no_getname,
272 .poll = datagram_poll,
273 .ioctl = sock_no_ioctl,
274 .listen = sock_no_listen,
275 .shutdown = sock_no_shutdown,
276 .setsockopt = sock_no_setsockopt,
277 .getsockopt = sock_no_getsockopt,
278 .sendmsg = rawsock_sendmsg,
279 .recvmsg = rawsock_recvmsg,
280 .mmap = sock_no_mmap,
281};
282
283static void rawsock_destruct(struct sock *sk)
284{
285 pr_debug("sk=%p\n", sk);
286
287 if (sk->sk_state == TCP_ESTABLISHED) {
288 nfc_deactivate_target(nfc_rawsock(sk)->dev,
289 nfc_rawsock(sk)->target_idx);
290 nfc_put_device(nfc_rawsock(sk)->dev);
291 }
292
293 skb_queue_purge(&sk->sk_receive_queue);
294
295 if (!sock_flag(sk, SOCK_DEAD)) {
296 pr_err("Freeing alive NFC raw socket %p\n", sk);
297 return;
298 }
299}
300
301static int rawsock_create(struct net *net, struct socket *sock,
302 const struct nfc_protocol *nfc_proto)
303{
304 struct sock *sk;
305
306 pr_debug("sock=%p\n", sock);
307
308 if (sock->type != SOCK_SEQPACKET)
309 return -ESOCKTNOSUPPORT;
310
311 sock->ops = &rawsock_ops;
312
313 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
314 if (!sk)
315 return -ENOMEM;
316
317 sock_init_data(sock, sk);
318 sk->sk_protocol = nfc_proto->id;
319 sk->sk_destruct = rawsock_destruct;
320 sock->state = SS_UNCONNECTED;
321
322 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
323 nfc_rawsock(sk)->tx_work_scheduled = false;
324
325 return 0;
326}
327
328static struct proto rawsock_proto = {
329 .name = "NFC_RAW",
330 .owner = THIS_MODULE,
331 .obj_size = sizeof(struct nfc_rawsock),
332};
333
334static const struct nfc_protocol rawsock_nfc_proto = {
335 .id = NFC_SOCKPROTO_RAW,
336 .proto = &rawsock_proto,
337 .owner = THIS_MODULE,
338 .create = rawsock_create
339};
340
341int __init rawsock_init(void)
342{
343 int rc;
344
345 rc = nfc_proto_register(&rawsock_nfc_proto);
346
347 return rc;
348}
349
350void rawsock_exit(void)
351{
352 nfc_proto_unregister(&rawsock_nfc_proto);
353}
354
