1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
10 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
12 #include <net/tcp_states.h>
13 #include <linux/nfc.h>
14 #include <linux/export.h>
18 static struct nfc_sock_list raw_sk_list = {
19 .lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock)
22 static void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk)
25 sk_add_node(sk, &l->head);
26 write_unlock(&l->lock);
29 static void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk)
33 write_unlock(&l->lock);
36 static void rawsock_write_queue_purge(struct sock *sk)
38 pr_debug("sk=%p\n", sk);
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);
46 static void rawsock_report_error(struct sock *sk, int err)
48 pr_debug("sk=%p err=%d\n", sk, err);
50 sk->sk_shutdown = SHUTDOWN_MASK;
52 sk->sk_error_report(sk);
54 rawsock_write_queue_purge(sk);
57 static int rawsock_release(struct socket *sock)
59 struct sock *sk = sock->sk;
61 pr_debug("sock=%p sk=%p\n", sock, sk);
66 if (sock->type == SOCK_RAW)
67 nfc_sock_unlink(&raw_sk_list, sk);
75 static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
78 struct sock *sk = sock->sk;
79 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
83 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
85 if (!addr || len < sizeof(struct sockaddr_nfc) ||
86 addr->sa_family != AF_NFC)
89 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
90 addr->dev_idx, addr->target_idx, addr->nfc_protocol);
94 if (sock->state == SS_CONNECTED) {
99 dev = nfc_get_device(addr->dev_idx);
105 if (addr->target_idx > dev->target_next_idx - 1 ||
106 addr->target_idx < dev->target_next_idx - dev->n_targets) {
111 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
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);
131 static int rawsock_add_header(struct sk_buff *skb)
133 *(u8 *)skb_push(skb, NFC_HEADER_SIZE) = 0;
138 static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
141 struct sock *sk = (struct sock *) context;
145 pr_debug("sk=%p err=%d\n", sk, err);
150 err = rawsock_add_header(skb);
154 err = sock_queue_rcv_skb(sk, skb);
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);
162 nfc_rawsock(sk)->tx_work_scheduled = false;
163 spin_unlock_bh(&sk->sk_write_queue.lock);
172 rawsock_report_error(sk, err);
176 static void rawsock_tx_work(struct work_struct *work)
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;
184 pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
186 if (sk->sk_shutdown & SEND_SHUTDOWN) {
187 rawsock_write_queue_purge(sk);
191 skb = skb_dequeue(&sk->sk_write_queue);
194 rc = nfc_data_exchange(dev, target_idx, skb,
195 rawsock_data_exchange_complete, sk);
197 rawsock_report_error(sk, rc);
202 static int rawsock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
204 struct sock *sk = sock->sk;
205 struct nfc_dev *dev = nfc_rawsock(sk)->dev;
209 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
211 if (msg->msg_namelen)
214 if (sock->state != SS_CONNECTED)
217 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
221 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
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;
233 spin_unlock_bh(&sk->sk_write_queue.lock);
238 static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
241 int noblock = flags & MSG_DONTWAIT;
242 struct sock *sk = sock->sk;
247 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
249 skb = skb_recv_datagram(sk, flags, noblock, &rc);
255 msg->msg_flags |= MSG_TRUNC;
259 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
261 skb_free_datagram(sk, skb);
263 return rc ? : copied;
266 static const struct proto_ops rawsock_ops = {
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,
275 .poll = datagram_poll,
276 .ioctl = sock_no_ioctl,
277 .listen = sock_no_listen,
278 .shutdown = sock_no_shutdown,
279 .setsockopt = sock_no_setsockopt,
280 .getsockopt = sock_no_getsockopt,
281 .sendmsg = rawsock_sendmsg,
282 .recvmsg = rawsock_recvmsg,
283 .mmap = sock_no_mmap,
286 static const struct proto_ops rawsock_raw_ops = {
288 .owner = THIS_MODULE,
289 .release = rawsock_release,
290 .bind = sock_no_bind,
291 .connect = sock_no_connect,
292 .socketpair = sock_no_socketpair,
293 .accept = sock_no_accept,
294 .getname = sock_no_getname,
295 .poll = datagram_poll,
296 .ioctl = sock_no_ioctl,
297 .listen = sock_no_listen,
298 .shutdown = sock_no_shutdown,
299 .setsockopt = sock_no_setsockopt,
300 .getsockopt = sock_no_getsockopt,
301 .sendmsg = sock_no_sendmsg,
302 .recvmsg = rawsock_recvmsg,
303 .mmap = sock_no_mmap,
306 static void rawsock_destruct(struct sock *sk)
308 pr_debug("sk=%p\n", sk);
310 if (sk->sk_state == TCP_ESTABLISHED) {
311 nfc_deactivate_target(nfc_rawsock(sk)->dev,
312 nfc_rawsock(sk)->target_idx,
313 NFC_TARGET_MODE_IDLE);
314 nfc_put_device(nfc_rawsock(sk)->dev);
317 skb_queue_purge(&sk->sk_receive_queue);
319 if (!sock_flag(sk, SOCK_DEAD)) {
320 pr_err("Freeing alive NFC raw socket %p\n", sk);
325 static int rawsock_create(struct net *net, struct socket *sock,
326 const struct nfc_protocol *nfc_proto, int kern)
330 pr_debug("sock=%p\n", sock);
332 if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
333 return -ESOCKTNOSUPPORT;
335 if (sock->type == SOCK_RAW)
336 sock->ops = &rawsock_raw_ops;
338 sock->ops = &rawsock_ops;
340 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
344 sock_init_data(sock, sk);
345 sk->sk_protocol = nfc_proto->id;
346 sk->sk_destruct = rawsock_destruct;
347 sock->state = SS_UNCONNECTED;
348 if (sock->type == SOCK_RAW)
349 nfc_sock_link(&raw_sk_list, sk);
351 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
352 nfc_rawsock(sk)->tx_work_scheduled = false;
358 void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
359 u8 payload_type, u8 direction)
361 struct sk_buff *skb_copy = NULL, *nskb;
365 read_lock(&raw_sk_list.lock);
367 sk_for_each(sk, &raw_sk_list.head) {
369 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
374 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
376 data[0] = dev ? dev->idx : 0xFF;
377 data[1] = direction & 0x01;
378 data[1] |= (payload_type << 1);
381 nskb = skb_clone(skb_copy, GFP_ATOMIC);
385 if (sock_queue_rcv_skb(sk, nskb))
389 read_unlock(&raw_sk_list.lock);
393 EXPORT_SYMBOL(nfc_send_to_raw_sock);
395 static struct proto rawsock_proto = {
397 .owner = THIS_MODULE,
398 .obj_size = sizeof(struct nfc_rawsock),
401 static const struct nfc_protocol rawsock_nfc_proto = {
402 .id = NFC_SOCKPROTO_RAW,
403 .proto = &rawsock_proto,
404 .owner = THIS_MODULE,
405 .create = rawsock_create
408 int __init rawsock_init(void)
412 rc = nfc_proto_register(&rawsock_nfc_proto);
417 void rawsock_exit(void)
419 nfc_proto_unregister(&rawsock_nfc_proto);