Commit | Line | Data |
---|---|---|
e6f95ec8 SB |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
3 | * Author: Sjur Brendeland sjur.brandeland@stericsson.com | |
e6f95ec8 SB |
4 | * License terms: GNU General Public License (GPL) version 2 |
5 | */ | |
6 | ||
7 | #include <linux/fs.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/mutex.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/tcp.h> | |
17 | #include <linux/uaccess.h> | |
bece7b23 SB |
18 | #include <linux/mutex.h> |
19 | #include <linux/debugfs.h> | |
e6f95ec8 | 20 | #include <linux/caif/caif_socket.h> |
bece7b23 SB |
21 | #include <asm/atomic.h> |
22 | #include <net/sock.h> | |
23 | #include <net/tcp_states.h> | |
e6f95ec8 SB |
24 | #include <net/caif/caif_layer.h> |
25 | #include <net/caif/caif_dev.h> | |
26 | #include <net/caif/cfpkt.h> | |
27 | ||
28 | MODULE_LICENSE("GPL"); | |
bece7b23 SB |
29 | MODULE_ALIAS_NETPROTO(AF_CAIF); |
30 | ||
31 | #define CAIF_DEF_SNDBUF (CAIF_MAX_PAYLOAD_SIZE*10) | |
32 | #define CAIF_DEF_RCVBUF (CAIF_MAX_PAYLOAD_SIZE*100) | |
33 | ||
34 | /* | |
35 | * CAIF state is re-using the TCP socket states. | |
36 | * caif_states stored in sk_state reflect the state as reported by | |
37 | * the CAIF stack, while sk_socket->state is the state of the socket. | |
38 | */ | |
39 | enum caif_states { | |
40 | CAIF_CONNECTED = TCP_ESTABLISHED, | |
41 | CAIF_CONNECTING = TCP_SYN_SENT, | |
42 | CAIF_DISCONNECTED = TCP_CLOSE | |
43 | }; | |
44 | ||
45 | #define TX_FLOW_ON_BIT 1 | |
46 | #define RX_FLOW_ON_BIT 2 | |
e6f95ec8 | 47 | |
e6f95ec8 | 48 | static struct dentry *debugfsdir; |
e6f95ec8 SB |
49 | |
50 | #ifdef CONFIG_DEBUG_FS | |
51 | struct debug_fs_counter { | |
bece7b23 SB |
52 | atomic_t caif_nr_socks; |
53 | atomic_t num_connect_req; | |
54 | atomic_t num_connect_resp; | |
55 | atomic_t num_connect_fail_resp; | |
56 | atomic_t num_disconnect; | |
e6f95ec8 SB |
57 | atomic_t num_remote_shutdown_ind; |
58 | atomic_t num_tx_flow_off_ind; | |
59 | atomic_t num_tx_flow_on_ind; | |
60 | atomic_t num_rx_flow_off; | |
61 | atomic_t num_rx_flow_on; | |
e6f95ec8 | 62 | }; |
a9a8f107 | 63 | static struct debug_fs_counter cnt; |
e6f95ec8 SB |
64 | #define dbfs_atomic_inc(v) atomic_inc(v) |
65 | #define dbfs_atomic_dec(v) atomic_dec(v) | |
66 | #else | |
67 | #define dbfs_atomic_inc(v) | |
68 | #define dbfs_atomic_dec(v) | |
69 | #endif | |
70 | ||
e6f95ec8 | 71 | struct caifsock { |
bece7b23 | 72 | struct sock sk; /* must be first member */ |
e6f95ec8 | 73 | struct cflayer layer; |
bece7b23 | 74 | char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */ |
e6f95ec8 | 75 | u32 flow_state; |
e6f95ec8 | 76 | struct caif_connect_request conn_req; |
bece7b23 | 77 | struct mutex readlock; |
e6f95ec8 SB |
78 | struct dentry *debugfs_socket_dir; |
79 | }; | |
80 | ||
bece7b23 SB |
81 | static int rx_flow_is_on(struct caifsock *cf_sk) |
82 | { | |
83 | return test_bit(RX_FLOW_ON_BIT, | |
84 | (void *) &cf_sk->flow_state); | |
85 | } | |
86 | ||
87 | static int tx_flow_is_on(struct caifsock *cf_sk) | |
88 | { | |
89 | return test_bit(TX_FLOW_ON_BIT, | |
90 | (void *) &cf_sk->flow_state); | |
91 | } | |
e6f95ec8 | 92 | |
bece7b23 | 93 | static void set_rx_flow_off(struct caifsock *cf_sk) |
e6f95ec8 | 94 | { |
bece7b23 SB |
95 | clear_bit(RX_FLOW_ON_BIT, |
96 | (void *) &cf_sk->flow_state); | |
97 | } | |
e6f95ec8 | 98 | |
bece7b23 SB |
99 | static void set_rx_flow_on(struct caifsock *cf_sk) |
100 | { | |
101 | set_bit(RX_FLOW_ON_BIT, | |
102 | (void *) &cf_sk->flow_state); | |
103 | } | |
e6f95ec8 | 104 | |
bece7b23 SB |
105 | static void set_tx_flow_off(struct caifsock *cf_sk) |
106 | { | |
107 | clear_bit(TX_FLOW_ON_BIT, | |
108 | (void *) &cf_sk->flow_state); | |
109 | } | |
e6f95ec8 | 110 | |
bece7b23 SB |
111 | static void set_tx_flow_on(struct caifsock *cf_sk) |
112 | { | |
113 | set_bit(TX_FLOW_ON_BIT, | |
114 | (void *) &cf_sk->flow_state); | |
115 | } | |
e6f95ec8 | 116 | |
bece7b23 SB |
117 | static void caif_read_lock(struct sock *sk) |
118 | { | |
119 | struct caifsock *cf_sk; | |
120 | cf_sk = container_of(sk, struct caifsock, sk); | |
121 | mutex_lock(&cf_sk->readlock); | |
122 | } | |
e6f95ec8 | 123 | |
bece7b23 SB |
124 | static void caif_read_unlock(struct sock *sk) |
125 | { | |
126 | struct caifsock *cf_sk; | |
127 | cf_sk = container_of(sk, struct caifsock, sk); | |
128 | mutex_unlock(&cf_sk->readlock); | |
129 | } | |
e6f95ec8 | 130 | |
a9a8f107 | 131 | static int sk_rcvbuf_lowwater(struct caifsock *cf_sk) |
bece7b23 SB |
132 | { |
133 | /* A quarter of full buffer is used a low water mark */ | |
134 | return cf_sk->sk.sk_rcvbuf / 4; | |
135 | } | |
e6f95ec8 | 136 | |
a9a8f107 | 137 | static void caif_flow_ctrl(struct sock *sk, int mode) |
bece7b23 SB |
138 | { |
139 | struct caifsock *cf_sk; | |
140 | cf_sk = container_of(sk, struct caifsock, sk); | |
ca6a09f2 | 141 | if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd) |
bece7b23 SB |
142 | cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode); |
143 | } | |
e6f95ec8 | 144 | |
bece7b23 SB |
145 | /* |
146 | * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are | |
147 | * not dropped, but CAIF is sending flow off instead. | |
148 | */ | |
a9a8f107 | 149 | static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
bece7b23 SB |
150 | { |
151 | int err; | |
152 | int skb_len; | |
153 | unsigned long flags; | |
154 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
155 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 156 | |
bece7b23 SB |
157 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
158 | (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) { | |
159 | trace_printk("CAIF: %s():" | |
160 | " sending flow OFF (queue len = %d %d)\n", | |
161 | __func__, | |
162 | atomic_read(&cf_sk->sk.sk_rmem_alloc), | |
163 | sk_rcvbuf_lowwater(cf_sk)); | |
164 | set_rx_flow_off(cf_sk); | |
ca6a09f2 SB |
165 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
166 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 | 167 | } |
e6f95ec8 | 168 | |
bece7b23 SB |
169 | err = sk_filter(sk, skb); |
170 | if (err) | |
171 | return err; | |
172 | if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) { | |
173 | set_rx_flow_off(cf_sk); | |
174 | trace_printk("CAIF: %s():" | |
175 | " sending flow OFF due to rmem_schedule\n", | |
176 | __func__); | |
ca6a09f2 SB |
177 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
178 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 SB |
179 | } |
180 | skb->dev = NULL; | |
181 | skb_set_owner_r(skb, sk); | |
182 | /* Cache the SKB length before we tack it onto the receive | |
183 | * queue. Once it is added it no longer belongs to us and | |
184 | * may be freed by other threads of control pulling packets | |
185 | * from the queue. | |
186 | */ | |
187 | skb_len = skb->len; | |
188 | spin_lock_irqsave(&list->lock, flags); | |
189 | if (!sock_flag(sk, SOCK_DEAD)) | |
190 | __skb_queue_tail(list, skb); | |
191 | spin_unlock_irqrestore(&list->lock, flags); | |
192 | ||
193 | if (!sock_flag(sk, SOCK_DEAD)) | |
194 | sk->sk_data_ready(sk, skb_len); | |
195 | else | |
196 | kfree_skb(skb); | |
e6f95ec8 SB |
197 | return 0; |
198 | } | |
199 | ||
bece7b23 SB |
200 | /* Packet Receive Callback function called from CAIF Stack */ |
201 | static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt) | |
e6f95ec8 SB |
202 | { |
203 | struct caifsock *cf_sk; | |
bece7b23 | 204 | struct sk_buff *skb; |
e6f95ec8 SB |
205 | |
206 | cf_sk = container_of(layr, struct caifsock, layer); | |
bece7b23 SB |
207 | skb = cfpkt_tonative(pkt); |
208 | ||
209 | if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) { | |
210 | cfpkt_destroy(pkt); | |
211 | return 0; | |
212 | } | |
213 | caif_queue_rcv_skb(&cf_sk->sk, skb); | |
214 | return 0; | |
215 | } | |
e6f95ec8 | 216 | |
bece7b23 SB |
217 | /* Packet Control Callback function called from CAIF */ |
218 | static void caif_ctrl_cb(struct cflayer *layr, | |
219 | enum caif_ctrlcmd flow, | |
220 | int phyid) | |
221 | { | |
222 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
e6f95ec8 SB |
223 | switch (flow) { |
224 | case CAIF_CTRLCMD_FLOW_ON_IND: | |
bece7b23 | 225 | /* OK from modem to start sending again */ |
e6f95ec8 | 226 | dbfs_atomic_inc(&cnt.num_tx_flow_on_ind); |
bece7b23 SB |
227 | set_tx_flow_on(cf_sk); |
228 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
229 | break; |
230 | ||
231 | case CAIF_CTRLCMD_FLOW_OFF_IND: | |
bece7b23 | 232 | /* Modem asks us to shut up */ |
e6f95ec8 | 233 | dbfs_atomic_inc(&cnt.num_tx_flow_off_ind); |
bece7b23 SB |
234 | set_tx_flow_off(cf_sk); |
235 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
236 | break; |
237 | ||
238 | case CAIF_CTRLCMD_INIT_RSP: | |
bece7b23 SB |
239 | /* We're now connected */ |
240 | dbfs_atomic_inc(&cnt.num_connect_resp); | |
241 | cf_sk->sk.sk_state = CAIF_CONNECTED; | |
242 | set_tx_flow_on(cf_sk); | |
243 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
244 | break; |
245 | ||
246 | case CAIF_CTRLCMD_DEINIT_RSP: | |
bece7b23 SB |
247 | /* We're now disconnected */ |
248 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
249 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
250 | cfcnfg_release_adap_layer(&cf_sk->layer); | |
e6f95ec8 SB |
251 | break; |
252 | ||
253 | case CAIF_CTRLCMD_INIT_FAIL_RSP: | |
bece7b23 SB |
254 | /* Connect request failed */ |
255 | dbfs_atomic_inc(&cnt.num_connect_fail_resp); | |
256 | cf_sk->sk.sk_err = ECONNREFUSED; | |
257 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
258 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; | |
259 | /* | |
260 | * Socket "standards" seems to require POLLOUT to | |
261 | * be set at connect failure. | |
262 | */ | |
263 | set_tx_flow_on(cf_sk); | |
264 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
265 | break; |
266 | ||
267 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: | |
bece7b23 | 268 | /* Modem has closed this connection, or device is down. */ |
e6f95ec8 | 269 | dbfs_atomic_inc(&cnt.num_remote_shutdown_ind); |
bece7b23 SB |
270 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; |
271 | cf_sk->sk.sk_err = ECONNRESET; | |
272 | set_rx_flow_on(cf_sk); | |
273 | cf_sk->sk.sk_error_report(&cf_sk->sk); | |
e6f95ec8 SB |
274 | break; |
275 | ||
276 | default: | |
277 | pr_debug("CAIF: %s(): Unexpected flow command %d\n", | |
bece7b23 | 278 | __func__, flow); |
e6f95ec8 SB |
279 | } |
280 | } | |
281 | ||
bece7b23 | 282 | static void caif_check_flow_release(struct sock *sk) |
e6f95ec8 | 283 | { |
bece7b23 | 284 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 285 | |
bece7b23 SB |
286 | if (rx_flow_is_on(cf_sk)) |
287 | return; | |
e6f95ec8 | 288 | |
bece7b23 SB |
289 | if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) { |
290 | dbfs_atomic_inc(&cnt.num_rx_flow_on); | |
291 | set_rx_flow_on(cf_sk); | |
ca6a09f2 | 292 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
bece7b23 SB |
293 | } |
294 | } | |
dcda138d | 295 | |
bece7b23 | 296 | /* |
dcda138d SB |
297 | * Copied from unix_dgram_recvmsg, but removed credit checks, |
298 | * changed locking, address handling and added MSG_TRUNC. | |
bece7b23 | 299 | */ |
bece7b23 | 300 | static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock, |
dcda138d | 301 | struct msghdr *m, size_t len, int flags) |
e6f95ec8 SB |
302 | |
303 | { | |
304 | struct sock *sk = sock->sk; | |
e6f95ec8 | 305 | struct sk_buff *skb; |
dcda138d SB |
306 | int ret; |
307 | int copylen; | |
e6f95ec8 | 308 | |
dcda138d SB |
309 | ret = -EOPNOTSUPP; |
310 | if (m->msg_flags&MSG_OOB) | |
311 | goto read_error; | |
e6f95ec8 | 312 | |
bece7b23 SB |
313 | skb = skb_recv_datagram(sk, flags, 0 , &ret); |
314 | if (!skb) | |
e6f95ec8 | 315 | goto read_error; |
dcda138d SB |
316 | copylen = skb->len; |
317 | if (len < copylen) { | |
318 | m->msg_flags |= MSG_TRUNC; | |
319 | copylen = len; | |
e6f95ec8 SB |
320 | } |
321 | ||
dcda138d | 322 | ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen); |
bece7b23 | 323 | if (ret) |
dcda138d | 324 | goto out_free; |
e6f95ec8 | 325 | |
dcda138d SB |
326 | ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
327 | out_free: | |
bece7b23 | 328 | skb_free_datagram(sk, skb); |
bece7b23 | 329 | caif_check_flow_release(sk); |
dcda138d | 330 | return ret; |
e6f95ec8 | 331 | |
bece7b23 SB |
332 | read_error: |
333 | return ret; | |
334 | } | |
e6f95ec8 | 335 | |
e6f95ec8 | 336 | |
bece7b23 SB |
337 | /* Copied from unix_stream_wait_data, identical except for lock call. */ |
338 | static long caif_stream_data_wait(struct sock *sk, long timeo) | |
339 | { | |
340 | DEFINE_WAIT(wait); | |
341 | lock_sock(sk); | |
342 | ||
343 | for (;;) { | |
344 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
345 | ||
346 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
347 | sk->sk_err || | |
348 | sk->sk_state != CAIF_CONNECTED || | |
349 | sock_flag(sk, SOCK_DEAD) || | |
350 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
351 | signal_pending(current) || | |
352 | !timeo) | |
353 | break; | |
e6f95ec8 | 354 | |
bece7b23 SB |
355 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
356 | release_sock(sk); | |
357 | timeo = schedule_timeout(timeo); | |
358 | lock_sock(sk); | |
359 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
e6f95ec8 SB |
360 | } |
361 | ||
bece7b23 SB |
362 | finish_wait(sk_sleep(sk), &wait); |
363 | release_sock(sk); | |
364 | return timeo; | |
365 | } | |
e6f95ec8 SB |
366 | |
367 | ||
bece7b23 SB |
368 | /* |
369 | * Copied from unix_stream_recvmsg, but removed credit checks, | |
370 | * changed locking calls, changed address handling. | |
371 | */ | |
372 | static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
373 | struct msghdr *msg, size_t size, | |
374 | int flags) | |
375 | { | |
376 | struct sock *sk = sock->sk; | |
377 | int copied = 0; | |
378 | int target; | |
379 | int err = 0; | |
380 | long timeo; | |
e6f95ec8 | 381 | |
bece7b23 SB |
382 | err = -EOPNOTSUPP; |
383 | if (flags&MSG_OOB) | |
384 | goto out; | |
e6f95ec8 | 385 | |
bece7b23 | 386 | msg->msg_namelen = 0; |
e6f95ec8 | 387 | |
bece7b23 SB |
388 | /* |
389 | * Lock the socket to prevent queue disordering | |
390 | * while sleeps in memcpy_tomsg | |
391 | */ | |
392 | err = -EAGAIN; | |
393 | if (sk->sk_state == CAIF_CONNECTING) | |
394 | goto out; | |
e6f95ec8 | 395 | |
bece7b23 SB |
396 | caif_read_lock(sk); |
397 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
398 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
e6f95ec8 | 399 | |
bece7b23 SB |
400 | do { |
401 | int chunk; | |
402 | struct sk_buff *skb; | |
e6f95ec8 | 403 | |
bece7b23 SB |
404 | lock_sock(sk); |
405 | skb = skb_dequeue(&sk->sk_receive_queue); | |
406 | caif_check_flow_release(sk); | |
e6f95ec8 | 407 | |
bece7b23 SB |
408 | if (skb == NULL) { |
409 | if (copied >= target) | |
410 | goto unlock; | |
411 | /* | |
412 | * POSIX 1003.1g mandates this order. | |
413 | */ | |
414 | err = sock_error(sk); | |
415 | if (err) | |
416 | goto unlock; | |
417 | err = -ECONNRESET; | |
418 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
419 | goto unlock; | |
e6f95ec8 | 420 | |
bece7b23 SB |
421 | err = -EPIPE; |
422 | if (sk->sk_state != CAIF_CONNECTED) | |
423 | goto unlock; | |
424 | if (sock_flag(sk, SOCK_DEAD)) | |
425 | goto unlock; | |
e6f95ec8 | 426 | |
bece7b23 | 427 | release_sock(sk); |
e6f95ec8 | 428 | |
bece7b23 SB |
429 | err = -EAGAIN; |
430 | if (!timeo) | |
431 | break; | |
e6f95ec8 | 432 | |
bece7b23 | 433 | caif_read_unlock(sk); |
e6f95ec8 | 434 | |
bece7b23 | 435 | timeo = caif_stream_data_wait(sk, timeo); |
e6f95ec8 | 436 | |
bece7b23 SB |
437 | if (signal_pending(current)) { |
438 | err = sock_intr_errno(timeo); | |
439 | goto out; | |
440 | } | |
441 | caif_read_lock(sk); | |
442 | continue; | |
443 | unlock: | |
444 | release_sock(sk); | |
445 | break; | |
e6f95ec8 | 446 | } |
bece7b23 SB |
447 | release_sock(sk); |
448 | chunk = min_t(unsigned int, skb->len, size); | |
449 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
450 | skb_queue_head(&sk->sk_receive_queue, skb); | |
451 | if (copied == 0) | |
452 | copied = -EFAULT; | |
453 | break; | |
454 | } | |
455 | copied += chunk; | |
456 | size -= chunk; | |
e6f95ec8 | 457 | |
bece7b23 SB |
458 | /* Mark read part of skb as used */ |
459 | if (!(flags & MSG_PEEK)) { | |
460 | skb_pull(skb, chunk); | |
e6f95ec8 | 461 | |
bece7b23 SB |
462 | /* put the skb back if we didn't use it up. */ |
463 | if (skb->len) { | |
464 | skb_queue_head(&sk->sk_receive_queue, skb); | |
465 | break; | |
466 | } | |
467 | kfree_skb(skb); | |
e6f95ec8 | 468 | |
e6f95ec8 | 469 | } else { |
bece7b23 SB |
470 | /* |
471 | * It is questionable, see note in unix_dgram_recvmsg. | |
472 | */ | |
473 | /* put message back and return */ | |
474 | skb_queue_head(&sk->sk_receive_queue, skb); | |
475 | break; | |
e6f95ec8 | 476 | } |
bece7b23 SB |
477 | } while (size); |
478 | caif_read_unlock(sk); | |
e6f95ec8 | 479 | |
bece7b23 SB |
480 | out: |
481 | return copied ? : err; | |
482 | } | |
e6f95ec8 | 483 | |
bece7b23 SB |
484 | /* |
485 | * Copied from sock.c:sock_wait_for_wmem, but change to wait for | |
486 | * CAIF flow-on and sock_writable. | |
487 | */ | |
488 | static long caif_wait_for_flow_on(struct caifsock *cf_sk, | |
489 | int wait_writeable, long timeo, int *err) | |
490 | { | |
491 | struct sock *sk = &cf_sk->sk; | |
492 | DEFINE_WAIT(wait); | |
493 | for (;;) { | |
494 | *err = 0; | |
495 | if (tx_flow_is_on(cf_sk) && | |
496 | (!wait_writeable || sock_writeable(&cf_sk->sk))) | |
497 | break; | |
498 | *err = -ETIMEDOUT; | |
499 | if (!timeo) | |
500 | break; | |
501 | *err = -ERESTARTSYS; | |
502 | if (signal_pending(current)) | |
503 | break; | |
504 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
505 | *err = -ECONNRESET; | |
506 | if (sk->sk_shutdown & SHUTDOWN_MASK) | |
507 | break; | |
508 | *err = -sk->sk_err; | |
509 | if (sk->sk_err) | |
510 | break; | |
511 | *err = -EPIPE; | |
512 | if (cf_sk->sk.sk_state != CAIF_CONNECTED) | |
513 | break; | |
514 | timeo = schedule_timeout(timeo); | |
e6f95ec8 | 515 | } |
bece7b23 SB |
516 | finish_wait(sk_sleep(sk), &wait); |
517 | return timeo; | |
518 | } | |
e6f95ec8 | 519 | |
bece7b23 SB |
520 | /* |
521 | * Transmit a SKB. The device may temporarily request re-transmission | |
522 | * by returning EAGAIN. | |
523 | */ | |
524 | static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, | |
525 | int noblock, long timeo) | |
526 | { | |
527 | struct cfpkt *pkt; | |
528 | int ret, loopcnt = 0; | |
e6f95ec8 | 529 | |
bece7b23 SB |
530 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
531 | memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); | |
532 | do { | |
e6f95ec8 | 533 | |
bece7b23 | 534 | ret = -ETIMEDOUT; |
e6f95ec8 | 535 | |
bece7b23 SB |
536 | /* Slight paranoia, probably not needed. */ |
537 | if (unlikely(loopcnt++ > 1000)) { | |
538 | pr_warning("CAIF: %s(): transmit retries failed," | |
539 | " error = %d\n", __func__, ret); | |
540 | break; | |
e6f95ec8 SB |
541 | } |
542 | ||
bece7b23 SB |
543 | if (cf_sk->layer.dn != NULL) |
544 | ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); | |
545 | if (likely(ret >= 0)) | |
546 | break; | |
547 | /* if transmit return -EAGAIN, then retry */ | |
548 | if (noblock && ret == -EAGAIN) | |
549 | break; | |
550 | timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret); | |
551 | if (signal_pending(current)) { | |
552 | ret = sock_intr_errno(timeo); | |
553 | break; | |
e6f95ec8 | 554 | } |
bece7b23 SB |
555 | if (ret) |
556 | break; | |
557 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
558 | sock_flag(&cf_sk->sk, SOCK_DEAD) || | |
559 | (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) { | |
560 | ret = -EPIPE; | |
561 | cf_sk->sk.sk_err = EPIPE; | |
562 | break; | |
e6f95ec8 | 563 | } |
bece7b23 SB |
564 | } while (ret == -EAGAIN); |
565 | return ret; | |
566 | } | |
e6f95ec8 | 567 | |
bece7b23 SB |
568 | /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ |
569 | static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
570 | struct msghdr *msg, size_t len) | |
571 | { | |
572 | struct sock *sk = sock->sk; | |
573 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
574 | int buffer_size; | |
575 | int ret = 0; | |
576 | struct sk_buff *skb = NULL; | |
577 | int noblock; | |
578 | long timeo; | |
579 | caif_assert(cf_sk); | |
580 | ret = sock_error(sk); | |
581 | if (ret) | |
582 | goto err; | |
583 | ||
584 | ret = -EOPNOTSUPP; | |
585 | if (msg->msg_flags&MSG_OOB) | |
586 | goto err; | |
587 | ||
588 | ret = -EOPNOTSUPP; | |
589 | if (msg->msg_namelen) | |
590 | goto err; | |
591 | ||
592 | ret = -EINVAL; | |
593 | if (unlikely(msg->msg_iov->iov_base == NULL)) | |
594 | goto err; | |
595 | noblock = msg->msg_flags & MSG_DONTWAIT; | |
596 | ||
597 | buffer_size = len + CAIF_NEEDED_HEADROOM + CAIF_NEEDED_TAILROOM; | |
598 | ||
599 | ret = -EMSGSIZE; | |
600 | if (buffer_size > CAIF_MAX_PAYLOAD_SIZE) | |
601 | goto err; | |
602 | ||
603 | timeo = sock_sndtimeo(sk, noblock); | |
604 | timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), | |
605 | 1, timeo, &ret); | |
606 | ||
607 | ret = -EPIPE; | |
608 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
609 | sock_flag(sk, SOCK_DEAD) || | |
610 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
611 | goto err; | |
612 | ||
613 | ret = -ENOMEM; | |
614 | skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); | |
615 | if (!skb) | |
616 | goto err; | |
617 | skb_reserve(skb, CAIF_NEEDED_HEADROOM); | |
618 | ||
619 | ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
620 | ||
621 | if (ret) | |
622 | goto err; | |
623 | ret = transmit_skb(skb, cf_sk, noblock, timeo); | |
624 | if (ret < 0) | |
625 | goto err; | |
626 | return len; | |
627 | err: | |
628 | kfree_skb(skb); | |
629 | return ret; | |
630 | } | |
e6f95ec8 | 631 | |
bece7b23 SB |
632 | /* |
633 | * Copied from unix_stream_sendmsg and adapted to CAIF: | |
634 | * Changed removed permission handling and added waiting for flow on | |
635 | * and other minor adaptations. | |
636 | */ | |
637 | static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
638 | struct msghdr *msg, size_t len) | |
639 | { | |
640 | struct sock *sk = sock->sk; | |
641 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
642 | int err, size; | |
643 | struct sk_buff *skb; | |
644 | int sent = 0; | |
645 | long timeo; | |
e6f95ec8 | 646 | |
bece7b23 | 647 | err = -EOPNOTSUPP; |
e6f95ec8 | 648 | |
bece7b23 SB |
649 | if (unlikely(msg->msg_flags&MSG_OOB)) |
650 | goto out_err; | |
e6f95ec8 | 651 | |
bece7b23 SB |
652 | if (unlikely(msg->msg_namelen)) |
653 | goto out_err; | |
e6f95ec8 | 654 | |
bece7b23 SB |
655 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
656 | timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err); | |
e6f95ec8 | 657 | |
bece7b23 SB |
658 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) |
659 | goto pipe_err; | |
e6f95ec8 | 660 | |
bece7b23 | 661 | while (sent < len) { |
e6f95ec8 | 662 | |
bece7b23 | 663 | size = len-sent; |
e6f95ec8 | 664 | |
bece7b23 SB |
665 | if (size > CAIF_MAX_PAYLOAD_SIZE) |
666 | size = CAIF_MAX_PAYLOAD_SIZE; | |
e6f95ec8 | 667 | |
bece7b23 SB |
668 | /* If size is more than half of sndbuf, chop up message */ |
669 | if (size > ((sk->sk_sndbuf >> 1) - 64)) | |
670 | size = (sk->sk_sndbuf >> 1) - 64; | |
e6f95ec8 | 671 | |
bece7b23 SB |
672 | if (size > SKB_MAX_ALLOC) |
673 | size = SKB_MAX_ALLOC; | |
e6f95ec8 | 674 | |
bece7b23 SB |
675 | skb = sock_alloc_send_skb(sk, |
676 | size + CAIF_NEEDED_HEADROOM | |
677 | + CAIF_NEEDED_TAILROOM, | |
678 | msg->msg_flags&MSG_DONTWAIT, | |
679 | &err); | |
680 | if (skb == NULL) | |
681 | goto out_err; | |
e6f95ec8 | 682 | |
bece7b23 SB |
683 | skb_reserve(skb, CAIF_NEEDED_HEADROOM); |
684 | /* | |
685 | * If you pass two values to the sock_alloc_send_skb | |
686 | * it tries to grab the large buffer with GFP_NOFS | |
687 | * (which can fail easily), and if it fails grab the | |
688 | * fallback size buffer which is under a page and will | |
689 | * succeed. [Alan] | |
690 | */ | |
691 | size = min_t(int, size, skb_tailroom(skb)); | |
e6f95ec8 | 692 | |
bece7b23 SB |
693 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
694 | if (err) { | |
695 | kfree_skb(skb); | |
696 | goto out_err; | |
697 | } | |
698 | err = transmit_skb(skb, cf_sk, | |
699 | msg->msg_flags&MSG_DONTWAIT, timeo); | |
700 | if (err < 0) { | |
701 | kfree_skb(skb); | |
702 | goto pipe_err; | |
703 | } | |
704 | sent += size; | |
e6f95ec8 | 705 | } |
e6f95ec8 | 706 | |
bece7b23 | 707 | return sent; |
e6f95ec8 | 708 | |
bece7b23 SB |
709 | pipe_err: |
710 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
711 | send_sig(SIGPIPE, current, 0); | |
712 | err = -EPIPE; | |
713 | out_err: | |
714 | return sent ? : err; | |
e6f95ec8 SB |
715 | } |
716 | ||
717 | static int setsockopt(struct socket *sock, | |
718 | int lvl, int opt, char __user *ov, unsigned int ol) | |
719 | { | |
720 | struct sock *sk = sock->sk; | |
721 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
722 | int prio, linksel; | |
723 | struct ifreq ifreq; | |
724 | ||
bece7b23 | 725 | if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED) |
e6f95ec8 | 726 | return -ENOPROTOOPT; |
bece7b23 | 727 | |
e6f95ec8 SB |
728 | switch (opt) { |
729 | case CAIFSO_LINK_SELECT: | |
bece7b23 | 730 | if (ol < sizeof(int)) |
e6f95ec8 | 731 | return -EINVAL; |
e6f95ec8 SB |
732 | if (lvl != SOL_CAIF) |
733 | goto bad_sol; | |
734 | if (copy_from_user(&linksel, ov, sizeof(int))) | |
735 | return -EINVAL; | |
736 | lock_sock(&(cf_sk->sk)); | |
737 | cf_sk->conn_req.link_selector = linksel; | |
738 | release_sock(&cf_sk->sk); | |
739 | return 0; | |
740 | ||
741 | case SO_PRIORITY: | |
742 | if (lvl != SOL_SOCKET) | |
743 | goto bad_sol; | |
bece7b23 | 744 | if (ol < sizeof(int)) |
e6f95ec8 | 745 | return -EINVAL; |
e6f95ec8 SB |
746 | if (copy_from_user(&prio, ov, sizeof(int))) |
747 | return -EINVAL; | |
748 | lock_sock(&(cf_sk->sk)); | |
749 | cf_sk->conn_req.priority = prio; | |
e6f95ec8 SB |
750 | release_sock(&cf_sk->sk); |
751 | return 0; | |
752 | ||
753 | case SO_BINDTODEVICE: | |
754 | if (lvl != SOL_SOCKET) | |
755 | goto bad_sol; | |
bece7b23 | 756 | if (ol < sizeof(struct ifreq)) |
e6f95ec8 | 757 | return -EINVAL; |
e6f95ec8 SB |
758 | if (copy_from_user(&ifreq, ov, sizeof(ifreq))) |
759 | return -EFAULT; | |
760 | lock_sock(&(cf_sk->sk)); | |
761 | strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name, | |
762 | sizeof(cf_sk->conn_req.link_name)); | |
763 | cf_sk->conn_req.link_name | |
764 | [sizeof(cf_sk->conn_req.link_name)-1] = 0; | |
765 | release_sock(&cf_sk->sk); | |
766 | return 0; | |
767 | ||
768 | case CAIFSO_REQ_PARAM: | |
769 | if (lvl != SOL_CAIF) | |
770 | goto bad_sol; | |
771 | if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL) | |
772 | return -ENOPROTOOPT; | |
e6f95ec8 SB |
773 | lock_sock(&(cf_sk->sk)); |
774 | cf_sk->conn_req.param.size = ol; | |
bece7b23 SB |
775 | if (ol > sizeof(cf_sk->conn_req.param.data) || |
776 | copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) { | |
e6f95ec8 | 777 | release_sock(&cf_sk->sk); |
e6f95ec8 SB |
778 | return -EINVAL; |
779 | } | |
e6f95ec8 SB |
780 | release_sock(&cf_sk->sk); |
781 | return 0; | |
782 | ||
783 | default: | |
bece7b23 | 784 | return -ENOPROTOOPT; |
e6f95ec8 SB |
785 | } |
786 | ||
787 | return 0; | |
788 | bad_sol: | |
e6f95ec8 SB |
789 | return -ENOPROTOOPT; |
790 | ||
791 | } | |
792 | ||
bece7b23 SB |
793 | /* |
794 | * caif_connect() - Connect a CAIF Socket | |
795 | * Copied and modified af_irda.c:irda_connect(). | |
796 | * | |
797 | * Note : by consulting "errno", the user space caller may learn the cause | |
798 | * of the failure. Most of them are visible in the function, others may come | |
799 | * from subroutines called and are listed here : | |
800 | * o -EAFNOSUPPORT: bad socket family or type. | |
801 | * o -ESOCKTNOSUPPORT: bad socket type or protocol | |
802 | * o -EINVAL: bad socket address, or CAIF link type | |
803 | * o -ECONNREFUSED: remote end refused the connection. | |
804 | * o -EINPROGRESS: connect request sent but timed out (or non-blocking) | |
805 | * o -EISCONN: already connected. | |
806 | * o -ETIMEDOUT: Connection timed out (send timeout) | |
807 | * o -ENODEV: No link layer to send request | |
808 | * o -ECONNRESET: Received Shutdown indication or lost link layer | |
809 | * o -ENOMEM: Out of memory | |
810 | * | |
811 | * State Strategy: | |
812 | * o sk_state: holds the CAIF_* protocol state, it's updated by | |
813 | * caif_ctrl_cb. | |
814 | * o sock->state: holds the SS_* socket state and is updated by connect and | |
815 | * disconnect. | |
816 | */ | |
817 | static int caif_connect(struct socket *sock, struct sockaddr *uaddr, | |
818 | int addr_len, int flags) | |
e6f95ec8 | 819 | { |
e6f95ec8 | 820 | struct sock *sk = sock->sk; |
bece7b23 SB |
821 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
822 | long timeo; | |
823 | int err; | |
824 | lock_sock(sk); | |
e6f95ec8 | 825 | |
bece7b23 SB |
826 | err = -EAFNOSUPPORT; |
827 | if (uaddr->sa_family != AF_CAIF) | |
e6f95ec8 SB |
828 | goto out; |
829 | ||
bece7b23 SB |
830 | err = -ESOCKTNOSUPPORT; |
831 | if (unlikely(!(sk->sk_type == SOCK_STREAM && | |
832 | cf_sk->sk.sk_protocol == CAIFPROTO_AT) && | |
833 | sk->sk_type != SOCK_SEQPACKET)) | |
834 | goto out; | |
835 | switch (sock->state) { | |
836 | case SS_UNCONNECTED: | |
837 | /* Normal case, a fresh connect */ | |
838 | caif_assert(sk->sk_state == CAIF_DISCONNECTED); | |
839 | break; | |
840 | case SS_CONNECTING: | |
841 | switch (sk->sk_state) { | |
842 | case CAIF_CONNECTED: | |
843 | sock->state = SS_CONNECTED; | |
844 | err = -EISCONN; | |
845 | goto out; | |
846 | case CAIF_DISCONNECTED: | |
847 | /* Reconnect allowed */ | |
848 | break; | |
849 | case CAIF_CONNECTING: | |
850 | err = -EALREADY; | |
851 | if (flags & O_NONBLOCK) | |
852 | goto out; | |
853 | goto wait_connect; | |
854 | } | |
855 | break; | |
856 | case SS_CONNECTED: | |
857 | caif_assert(sk->sk_state == CAIF_CONNECTED || | |
858 | sk->sk_state == CAIF_DISCONNECTED); | |
859 | if (sk->sk_shutdown & SHUTDOWN_MASK) { | |
860 | /* Allow re-connect after SHUTDOWN_IND */ | |
861 | caif_disconnect_client(&cf_sk->layer); | |
862 | break; | |
863 | } | |
864 | /* No reconnect on a seqpacket socket */ | |
865 | err = -EISCONN; | |
866 | goto out; | |
867 | case SS_DISCONNECTING: | |
868 | case SS_FREE: | |
869 | caif_assert(1); /*Should never happen */ | |
870 | break; | |
e6f95ec8 | 871 | } |
bece7b23 SB |
872 | sk->sk_state = CAIF_DISCONNECTED; |
873 | sock->state = SS_UNCONNECTED; | |
874 | sk_stream_kill_queues(&cf_sk->sk); | |
e6f95ec8 | 875 | |
bece7b23 SB |
876 | err = -EINVAL; |
877 | if (addr_len != sizeof(struct sockaddr_caif) || | |
878 | !uaddr) | |
879 | goto out; | |
e6f95ec8 | 880 | |
bece7b23 | 881 | memcpy(&cf_sk->conn_req.sockaddr, uaddr, |
e6f95ec8 SB |
882 | sizeof(struct sockaddr_caif)); |
883 | ||
bece7b23 SB |
884 | /* Move to connecting socket, start sending Connect Requests */ |
885 | sock->state = SS_CONNECTING; | |
886 | sk->sk_state = CAIF_CONNECTING; | |
887 | ||
888 | dbfs_atomic_inc(&cnt.num_connect_req); | |
889 | cf_sk->layer.receive = caif_sktrecv_cb; | |
890 | err = caif_connect_client(&cf_sk->conn_req, | |
891 | &cf_sk->layer); | |
892 | if (err < 0) { | |
893 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
894 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
895 | goto out; | |
e6f95ec8 SB |
896 | } |
897 | ||
bece7b23 SB |
898 | err = -EINPROGRESS; |
899 | wait_connect: | |
e6f95ec8 | 900 | |
bece7b23 SB |
901 | if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK)) |
902 | goto out; | |
e6f95ec8 | 903 | |
bece7b23 SB |
904 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
905 | ||
906 | release_sock(sk); | |
9e4b816b SB |
907 | err = -ERESTARTSYS; |
908 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), | |
bece7b23 SB |
909 | sk->sk_state != CAIF_CONNECTING, |
910 | timeo); | |
911 | lock_sock(sk); | |
9e4b816b | 912 | if (timeo < 0) |
bece7b23 | 913 | goto out; /* -ERESTARTSYS */ |
e6f95ec8 | 914 | |
9e4b816b SB |
915 | err = -ETIMEDOUT; |
916 | if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) | |
917 | goto out; | |
bece7b23 SB |
918 | if (sk->sk_state != CAIF_CONNECTED) { |
919 | sock->state = SS_UNCONNECTED; | |
920 | err = sock_error(sk); | |
921 | if (!err) | |
922 | err = -ECONNREFUSED; | |
923 | goto out; | |
924 | } | |
925 | sock->state = SS_CONNECTED; | |
926 | err = 0; | |
e6f95ec8 | 927 | out: |
bece7b23 SB |
928 | release_sock(sk); |
929 | return err; | |
e6f95ec8 SB |
930 | } |
931 | ||
bece7b23 SB |
932 | /* |
933 | * caif_release() - Disconnect a CAIF Socket | |
934 | * Copied and modified af_irda.c:irda_release(). | |
935 | */ | |
936 | static int caif_release(struct socket *sock) | |
e6f95ec8 | 937 | { |
e6f95ec8 | 938 | struct sock *sk = sock->sk; |
bece7b23 SB |
939 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
940 | int res = 0; | |
e6f95ec8 | 941 | |
bece7b23 SB |
942 | if (!sk) |
943 | return 0; | |
e6f95ec8 | 944 | |
bece7b23 | 945 | set_tx_flow_off(cf_sk); |
e6f95ec8 SB |
946 | |
947 | /* | |
bece7b23 SB |
948 | * Ensure that packets are not queued after this point in time. |
949 | * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock, | |
950 | * this ensures no packets when sock is dead. | |
e6f95ec8 | 951 | */ |
bece7b23 SB |
952 | spin_lock(&sk->sk_receive_queue.lock); |
953 | sock_set_flag(sk, SOCK_DEAD); | |
954 | spin_unlock(&sk->sk_receive_queue.lock); | |
955 | sock->sk = NULL; | |
e6f95ec8 | 956 | |
bece7b23 | 957 | dbfs_atomic_inc(&cnt.num_disconnect); |
e6f95ec8 SB |
958 | |
959 | if (cf_sk->debugfs_socket_dir != NULL) | |
960 | debugfs_remove_recursive(cf_sk->debugfs_socket_dir); | |
961 | ||
e6f95ec8 | 962 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
963 | sk->sk_state = CAIF_DISCONNECTED; |
964 | sk->sk_shutdown = SHUTDOWN_MASK; | |
e6f95ec8 | 965 | |
bece7b23 SB |
966 | if (cf_sk->sk.sk_socket->state == SS_CONNECTED || |
967 | cf_sk->sk.sk_socket->state == SS_CONNECTING) | |
968 | res = caif_disconnect_client(&cf_sk->layer); | |
e6f95ec8 | 969 | |
bece7b23 SB |
970 | cf_sk->sk.sk_socket->state = SS_DISCONNECTING; |
971 | wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP); | |
e6f95ec8 | 972 | |
bece7b23 SB |
973 | sock_orphan(sk); |
974 | cf_sk->layer.dn = NULL; | |
975 | sk_stream_kill_queues(&cf_sk->sk); | |
976 | release_sock(sk); | |
977 | sock_put(sk); | |
978 | return res; | |
979 | } | |
e6f95ec8 | 980 | |
bece7b23 SB |
981 | /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */ |
982 | static unsigned int caif_poll(struct file *file, | |
983 | struct socket *sock, poll_table *wait) | |
984 | { | |
985 | struct sock *sk = sock->sk; | |
986 | unsigned int mask; | |
987 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 988 | |
bece7b23 SB |
989 | sock_poll_wait(file, sk_sleep(sk), wait); |
990 | mask = 0; | |
e6f95ec8 | 991 | |
bece7b23 SB |
992 | /* exceptional events? */ |
993 | if (sk->sk_err) | |
994 | mask |= POLLERR; | |
995 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
996 | mask |= POLLHUP; | |
997 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
998 | mask |= POLLRDHUP; | |
e6f95ec8 | 999 | |
bece7b23 SB |
1000 | /* readable? */ |
1001 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1002 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1003 | mask |= POLLIN | POLLRDNORM; | |
e6f95ec8 | 1004 | |
e6f95ec8 | 1005 | /* |
bece7b23 SB |
1006 | * we set writable also when the other side has shut down the |
1007 | * connection. This prevents stuck sockets. | |
e6f95ec8 | 1008 | */ |
bece7b23 SB |
1009 | if (sock_writeable(sk) && tx_flow_is_on(cf_sk)) |
1010 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1011 | ||
1012 | return mask; | |
e6f95ec8 SB |
1013 | } |
1014 | ||
bece7b23 SB |
1015 | static const struct proto_ops caif_seqpacket_ops = { |
1016 | .family = PF_CAIF, | |
1017 | .owner = THIS_MODULE, | |
1018 | .release = caif_release, | |
1019 | .bind = sock_no_bind, | |
1020 | .connect = caif_connect, | |
1021 | .socketpair = sock_no_socketpair, | |
1022 | .accept = sock_no_accept, | |
1023 | .getname = sock_no_getname, | |
1024 | .poll = caif_poll, | |
1025 | .ioctl = sock_no_ioctl, | |
1026 | .listen = sock_no_listen, | |
1027 | .shutdown = sock_no_shutdown, | |
1028 | .setsockopt = setsockopt, | |
1029 | .getsockopt = sock_no_getsockopt, | |
1030 | .sendmsg = caif_seqpkt_sendmsg, | |
1031 | .recvmsg = caif_seqpkt_recvmsg, | |
1032 | .mmap = sock_no_mmap, | |
1033 | .sendpage = sock_no_sendpage, | |
1034 | }; | |
1035 | ||
1036 | static const struct proto_ops caif_stream_ops = { | |
e6f95ec8 SB |
1037 | .family = PF_CAIF, |
1038 | .owner = THIS_MODULE, | |
1039 | .release = caif_release, | |
1040 | .bind = sock_no_bind, | |
1041 | .connect = caif_connect, | |
1042 | .socketpair = sock_no_socketpair, | |
1043 | .accept = sock_no_accept, | |
1044 | .getname = sock_no_getname, | |
1045 | .poll = caif_poll, | |
1046 | .ioctl = sock_no_ioctl, | |
1047 | .listen = sock_no_listen, | |
bece7b23 | 1048 | .shutdown = sock_no_shutdown, |
e6f95ec8 SB |
1049 | .setsockopt = setsockopt, |
1050 | .getsockopt = sock_no_getsockopt, | |
bece7b23 SB |
1051 | .sendmsg = caif_stream_sendmsg, |
1052 | .recvmsg = caif_stream_recvmsg, | |
e6f95ec8 | 1053 | .mmap = sock_no_mmap, |
bece7b23 | 1054 | .sendpage = sock_no_sendpage, |
e6f95ec8 SB |
1055 | }; |
1056 | ||
1057 | /* This function is called when a socket is finally destroyed. */ | |
1058 | static void caif_sock_destructor(struct sock *sk) | |
1059 | { | |
bece7b23 | 1060 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 SB |
1061 | caif_assert(!atomic_read(&sk->sk_wmem_alloc)); |
1062 | caif_assert(sk_unhashed(sk)); | |
1063 | caif_assert(!sk->sk_socket); | |
1064 | if (!sock_flag(sk, SOCK_DEAD)) { | |
bece7b23 | 1065 | pr_info("Attempt to release alive CAIF socket: %p\n", sk); |
e6f95ec8 SB |
1066 | return; |
1067 | } | |
bece7b23 SB |
1068 | sk_stream_kill_queues(&cf_sk->sk); |
1069 | dbfs_atomic_dec(&cnt.caif_nr_socks); | |
e6f95ec8 SB |
1070 | } |
1071 | ||
1072 | static int caif_create(struct net *net, struct socket *sock, int protocol, | |
bece7b23 | 1073 | int kern) |
e6f95ec8 SB |
1074 | { |
1075 | struct sock *sk = NULL; | |
1076 | struct caifsock *cf_sk = NULL; | |
e6f95ec8 SB |
1077 | static struct proto prot = {.name = "PF_CAIF", |
1078 | .owner = THIS_MODULE, | |
1079 | .obj_size = sizeof(struct caifsock), | |
1080 | }; | |
1081 | ||
bece7b23 SB |
1082 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) |
1083 | return -EPERM; | |
e6f95ec8 SB |
1084 | /* |
1085 | * The sock->type specifies the socket type to use. | |
bece7b23 SB |
1086 | * The CAIF socket is a packet stream in the sense |
1087 | * that it is packet based. CAIF trusts the reliability | |
1088 | * of the link, no resending is implemented. | |
e6f95ec8 | 1089 | */ |
bece7b23 SB |
1090 | if (sock->type == SOCK_SEQPACKET) |
1091 | sock->ops = &caif_seqpacket_ops; | |
1092 | else if (sock->type == SOCK_STREAM) | |
1093 | sock->ops = &caif_stream_ops; | |
1094 | else | |
e6f95ec8 SB |
1095 | return -ESOCKTNOSUPPORT; |
1096 | ||
e6f95ec8 SB |
1097 | if (protocol < 0 || protocol >= CAIFPROTO_MAX) |
1098 | return -EPROTONOSUPPORT; | |
1099 | /* | |
bece7b23 SB |
1100 | * Set the socket state to unconnected. The socket state |
1101 | * is really not used at all in the net/core or socket.c but the | |
e6f95ec8 SB |
1102 | * initialization makes sure that sock->state is not uninitialized. |
1103 | */ | |
e6f95ec8 SB |
1104 | sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot); |
1105 | if (!sk) | |
1106 | return -ENOMEM; | |
1107 | ||
1108 | cf_sk = container_of(sk, struct caifsock, sk); | |
1109 | ||
1110 | /* Store the protocol */ | |
1111 | sk->sk_protocol = (unsigned char) protocol; | |
1112 | ||
bece7b23 SB |
1113 | /* Sendbuf dictates the amount of outbound packets not yet sent */ |
1114 | sk->sk_sndbuf = CAIF_DEF_SNDBUF; | |
1115 | sk->sk_rcvbuf = CAIF_DEF_RCVBUF; | |
e6f95ec8 SB |
1116 | |
1117 | /* | |
1118 | * Lock in order to try to stop someone from opening the socket | |
1119 | * too early. | |
1120 | */ | |
1121 | lock_sock(&(cf_sk->sk)); | |
1122 | ||
1123 | /* Initialize the nozero default sock structure data. */ | |
1124 | sock_init_data(sock, sk); | |
e6f95ec8 | 1125 | sk->sk_destruct = caif_sock_destructor; |
e6f95ec8 | 1126 | |
bece7b23 SB |
1127 | mutex_init(&cf_sk->readlock); /* single task reading lock */ |
1128 | cf_sk->layer.ctrlcmd = caif_ctrl_cb; | |
1129 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
1130 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
e6f95ec8 | 1131 | |
bece7b23 SB |
1132 | set_tx_flow_off(cf_sk); |
1133 | set_rx_flow_on(cf_sk); | |
e6f95ec8 SB |
1134 | |
1135 | /* Set default options on configuration */ | |
1136 | cf_sk->conn_req.priority = CAIF_PRIO_NORMAL; | |
bece7b23 | 1137 | cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY; |
e6f95ec8 SB |
1138 | cf_sk->conn_req.protocol = protocol; |
1139 | /* Increase the number of sockets created. */ | |
bece7b23 SB |
1140 | dbfs_atomic_inc(&cnt.caif_nr_socks); |
1141 | #ifdef CONFIG_DEBUG_FS | |
e6f95ec8 | 1142 | if (!IS_ERR(debugfsdir)) { |
bece7b23 SB |
1143 | /* Fill in some information concerning the misc socket. */ |
1144 | snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", | |
1145 | atomic_read(&cnt.caif_nr_socks)); | |
1146 | ||
e6f95ec8 SB |
1147 | cf_sk->debugfs_socket_dir = |
1148 | debugfs_create_dir(cf_sk->name, debugfsdir); | |
bece7b23 SB |
1149 | debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR, |
1150 | cf_sk->debugfs_socket_dir, | |
1151 | (u32 *) &cf_sk->sk.sk_state); | |
e6f95ec8 SB |
1152 | debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR, |
1153 | cf_sk->debugfs_socket_dir, &cf_sk->flow_state); | |
bece7b23 SB |
1154 | debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR, |
1155 | cf_sk->debugfs_socket_dir, | |
1156 | (u32 *) &cf_sk->sk.sk_rmem_alloc); | |
1157 | debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1158 | cf_sk->debugfs_socket_dir, |
bece7b23 | 1159 | (u32 *) &cf_sk->sk.sk_wmem_alloc); |
e6f95ec8 SB |
1160 | debugfs_create_u32("identity", S_IRUSR | S_IWUSR, |
1161 | cf_sk->debugfs_socket_dir, | |
1162 | (u32 *) &cf_sk->layer.id); | |
1163 | } | |
bece7b23 | 1164 | #endif |
e6f95ec8 SB |
1165 | release_sock(&cf_sk->sk); |
1166 | return 0; | |
e6f95ec8 SB |
1167 | } |
1168 | ||
bece7b23 | 1169 | |
e6f95ec8 SB |
1170 | static struct net_proto_family caif_family_ops = { |
1171 | .family = PF_CAIF, | |
1172 | .create = caif_create, | |
1173 | .owner = THIS_MODULE, | |
1174 | }; | |
1175 | ||
a9a8f107 | 1176 | static int af_caif_init(void) |
e6f95ec8 | 1177 | { |
bece7b23 | 1178 | int err = sock_register(&caif_family_ops); |
e6f95ec8 SB |
1179 | if (!err) |
1180 | return err; | |
e6f95ec8 SB |
1181 | return 0; |
1182 | } | |
1183 | ||
1184 | static int __init caif_sktinit_module(void) | |
1185 | { | |
e6f95ec8 | 1186 | #ifdef CONFIG_DEBUG_FS |
bece7b23 | 1187 | debugfsdir = debugfs_create_dir("caif_sk", NULL); |
e6f95ec8 | 1188 | if (!IS_ERR(debugfsdir)) { |
e6f95ec8 SB |
1189 | debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR, |
1190 | debugfsdir, | |
bece7b23 SB |
1191 | (u32 *) &cnt.caif_nr_socks); |
1192 | debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1193 | debugfsdir, |
bece7b23 SB |
1194 | (u32 *) &cnt.num_connect_req); |
1195 | debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1196 | debugfsdir, |
bece7b23 SB |
1197 | (u32 *) &cnt.num_connect_resp); |
1198 | debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1199 | debugfsdir, |
bece7b23 SB |
1200 | (u32 *) &cnt.num_connect_fail_resp); |
1201 | debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1202 | debugfsdir, |
bece7b23 | 1203 | (u32 *) &cnt.num_disconnect); |
e6f95ec8 SB |
1204 | debugfs_create_u32("num_remote_shutdown_ind", |
1205 | S_IRUSR | S_IWUSR, debugfsdir, | |
1206 | (u32 *) &cnt.num_remote_shutdown_ind); | |
1207 | debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR, | |
1208 | debugfsdir, | |
1209 | (u32 *) &cnt.num_tx_flow_off_ind); | |
1210 | debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR, | |
1211 | debugfsdir, | |
1212 | (u32 *) &cnt.num_tx_flow_on_ind); | |
1213 | debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR, | |
1214 | debugfsdir, | |
1215 | (u32 *) &cnt.num_rx_flow_off); | |
1216 | debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR, | |
1217 | debugfsdir, | |
1218 | (u32 *) &cnt.num_rx_flow_on); | |
1219 | } | |
1220 | #endif | |
bece7b23 | 1221 | return af_caif_init(); |
e6f95ec8 SB |
1222 | } |
1223 | ||
1224 | static void __exit caif_sktexit_module(void) | |
1225 | { | |
1226 | sock_unregister(PF_CAIF); | |
1227 | if (debugfsdir != NULL) | |
1228 | debugfs_remove_recursive(debugfsdir); | |
1229 | } | |
e6f95ec8 SB |
1230 | module_init(caif_sktinit_module); |
1231 | module_exit(caif_sktexit_module); |