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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 sk=%p\n", sock, sk);
58
59 if (!sk)
60 return 0;
61
62 sock_orphan(sk);
63 sock_put(sk);
64
65 return 0;
66}
67
68static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
69 int len, int flags)
70{
71 struct sock *sk = sock->sk;
72 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
73 struct nfc_dev *dev;
74 int rc = 0;
75
76 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
77
78 if (!addr || len < sizeof(struct sockaddr_nfc) ||
79 addr->sa_family != AF_NFC)
80 return -EINVAL;
81
82 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
83 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
84
85 lock_sock(sk);
86
87 if (sock->state == SS_CONNECTED) {
88 rc = -EISCONN;
89 goto error;
90 }
91
92 dev = nfc_get_device(addr->dev_idx);
93 if (!dev) {
94 rc = -ENODEV;
95 goto error;
96 }
97
98 if (addr->target_idx > dev->target_next_idx - 1 ||
99 addr->target_idx < dev->target_next_idx - dev->n_targets) {
100 rc = -EINVAL;
101 goto error;
102 }
103
104 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
105 if (rc)
106 goto put_dev;
107
108 nfc_rawsock(sk)->dev = dev;
109 nfc_rawsock(sk)->target_idx = addr->target_idx;
110 sock->state = SS_CONNECTED;
111 sk->sk_state = TCP_ESTABLISHED;
112 sk->sk_state_change(sk);
113
114 release_sock(sk);
115 return 0;
116
117put_dev:
118 nfc_put_device(dev);
119error:
120 release_sock(sk);
121 return rc;
122}
123
124static int rawsock_add_header(struct sk_buff *skb)
125{
126 *skb_push(skb, NFC_HEADER_SIZE) = 0;
127
128 return 0;
129}
130
131static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
132 int err)
133{
134 struct sock *sk = (struct sock *) context;
135
136 BUG_ON(in_irq());
137
138 pr_debug("sk=%p err=%d\n", sk, err);
139
140 if (err)
141 goto error;
142
143 err = rawsock_add_header(skb);
144 if (err)
145 goto error;
146
147 err = sock_queue_rcv_skb(sk, skb);
148 if (err)
149 goto error;
150
151 spin_lock_bh(&sk->sk_write_queue.lock);
152 if (!skb_queue_empty(&sk->sk_write_queue))
153 schedule_work(&nfc_rawsock(sk)->tx_work);
154 else
155 nfc_rawsock(sk)->tx_work_scheduled = false;
156 spin_unlock_bh(&sk->sk_write_queue.lock);
157
158 sock_put(sk);
159 return;
160
161error:
162 rawsock_report_error(sk, err);
163 sock_put(sk);
164}
165
166static void rawsock_tx_work(struct work_struct *work)
167{
168 struct sock *sk = to_rawsock_sk(work);
169 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
170 u32 target_idx = nfc_rawsock(sk)->target_idx;
171 struct sk_buff *skb;
172 int rc;
173
174 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
175
176 if (sk->sk_shutdown & SEND_SHUTDOWN) {
177 rawsock_write_queue_purge(sk);
178 return;
179 }
180
181 skb = skb_dequeue(&sk->sk_write_queue);
182
183 sock_hold(sk);
184 rc = nfc_data_exchange(dev, target_idx, skb,
185 rawsock_data_exchange_complete, sk);
186 if (rc) {
187 rawsock_report_error(sk, rc);
188 sock_put(sk);
189 }
190}
191
192static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
193 struct msghdr *msg, size_t len)
194{
195 struct sock *sk = sock->sk;
196 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
197 struct sk_buff *skb;
198 int rc;
199
200 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
201
202 if (msg->msg_namelen)
203 return -EOPNOTSUPP;
204
205 if (sock->state != SS_CONNECTED)
206 return -ENOTCONN;
207
208 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
209 if (skb == NULL)
210 return rc;
211
212 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
213 if (rc < 0) {
214 kfree_skb(skb);
215 return rc;
216 }
217
218 spin_lock_bh(&sk->sk_write_queue.lock);
219 __skb_queue_tail(&sk->sk_write_queue, skb);
220 if (!nfc_rawsock(sk)->tx_work_scheduled) {
221 schedule_work(&nfc_rawsock(sk)->tx_work);
222 nfc_rawsock(sk)->tx_work_scheduled = true;
223 }
224 spin_unlock_bh(&sk->sk_write_queue.lock);
225
226 return len;
227}
228
229static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
230 struct msghdr *msg, size_t len, int flags)
231{
232 int noblock = flags & MSG_DONTWAIT;
233 struct sock *sk = sock->sk;
234 struct sk_buff *skb;
235 int copied;
236 int rc;
237
238 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
239
240 skb = skb_recv_datagram(sk, flags, noblock, &rc);
241 if (!skb)
242 return rc;
243
244 msg->msg_namelen = 0;
245
246 copied = skb->len;
247 if (len < copied) {
248 msg->msg_flags |= MSG_TRUNC;
249 copied = len;
250 }
251
252 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
253
254 skb_free_datagram(sk, skb);
255
256 return rc ? : copied;
257}
258
259static const struct proto_ops rawsock_ops = {
260 .family = PF_NFC,
261 .owner = THIS_MODULE,
262 .release = rawsock_release,
263 .bind = sock_no_bind,
264 .connect = rawsock_connect,
265 .socketpair = sock_no_socketpair,
266 .accept = sock_no_accept,
267 .getname = sock_no_getname,
268 .poll = datagram_poll,
269 .ioctl = sock_no_ioctl,
270 .listen = sock_no_listen,
271 .shutdown = sock_no_shutdown,
272 .setsockopt = sock_no_setsockopt,
273 .getsockopt = sock_no_getsockopt,
274 .sendmsg = rawsock_sendmsg,
275 .recvmsg = rawsock_recvmsg,
276 .mmap = sock_no_mmap,
277};
278
279static void rawsock_destruct(struct sock *sk)
280{
281 pr_debug("sk=%p\n", sk);
282
283 if (sk->sk_state == TCP_ESTABLISHED) {
284 nfc_deactivate_target(nfc_rawsock(sk)->dev,
285 nfc_rawsock(sk)->target_idx);
286 nfc_put_device(nfc_rawsock(sk)->dev);
287 }
288
289 skb_queue_purge(&sk->sk_receive_queue);
290
291 if (!sock_flag(sk, SOCK_DEAD)) {
292 pr_err("Freeing alive NFC raw socket %p\n", sk);
293 return;
294 }
295}
296
297static int rawsock_create(struct net *net, struct socket *sock,
298 const struct nfc_protocol *nfc_proto)
299{
300 struct sock *sk;
301
302 pr_debug("sock=%p\n", sock);
303
304 if (sock->type != SOCK_SEQPACKET)
305 return -ESOCKTNOSUPPORT;
306
307 sock->ops = &rawsock_ops;
308
309 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
310 if (!sk)
311 return -ENOMEM;
312
313 sock_init_data(sock, sk);
314 sk->sk_protocol = nfc_proto->id;
315 sk->sk_destruct = rawsock_destruct;
316 sock->state = SS_UNCONNECTED;
317
318 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
319 nfc_rawsock(sk)->tx_work_scheduled = false;
320
321 return 0;
322}
323
324static struct proto rawsock_proto = {
325 .name = "NFC_RAW",
326 .owner = THIS_MODULE,
327 .obj_size = sizeof(struct nfc_rawsock),
328};
329
330static const struct nfc_protocol rawsock_nfc_proto = {
331 .id = NFC_SOCKPROTO_RAW,
332 .proto = &rawsock_proto,
333 .owner = THIS_MODULE,
334 .create = rawsock_create
335};
336
337int __init rawsock_init(void)
338{
339 int rc;
340
341 rc = nfc_proto_register(&rawsock_nfc_proto);
342
343 return rc;
344}
345
346void rawsock_exit(void)
347{
348 nfc_proto_unregister(&rawsock_nfc_proto);
349}
350
