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 | ||
2aa40aef SB |
31 | #define CAIF_DEF_SNDBUF (4096*10) |
32 | #define CAIF_DEF_RCVBUF (4096*100) | |
bece7b23 SB |
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 | 78 | struct dentry *debugfs_socket_dir; |
2aa40aef | 79 | int headroom, tailroom, maxframe; |
e6f95ec8 SB |
80 | }; |
81 | ||
bece7b23 SB |
82 | static int rx_flow_is_on(struct caifsock *cf_sk) |
83 | { | |
84 | return test_bit(RX_FLOW_ON_BIT, | |
85 | (void *) &cf_sk->flow_state); | |
86 | } | |
87 | ||
88 | static int tx_flow_is_on(struct caifsock *cf_sk) | |
89 | { | |
90 | return test_bit(TX_FLOW_ON_BIT, | |
91 | (void *) &cf_sk->flow_state); | |
92 | } | |
e6f95ec8 | 93 | |
bece7b23 | 94 | static void set_rx_flow_off(struct caifsock *cf_sk) |
e6f95ec8 | 95 | { |
bece7b23 SB |
96 | clear_bit(RX_FLOW_ON_BIT, |
97 | (void *) &cf_sk->flow_state); | |
98 | } | |
e6f95ec8 | 99 | |
bece7b23 SB |
100 | static void set_rx_flow_on(struct caifsock *cf_sk) |
101 | { | |
102 | set_bit(RX_FLOW_ON_BIT, | |
103 | (void *) &cf_sk->flow_state); | |
104 | } | |
e6f95ec8 | 105 | |
bece7b23 SB |
106 | static void set_tx_flow_off(struct caifsock *cf_sk) |
107 | { | |
108 | clear_bit(TX_FLOW_ON_BIT, | |
109 | (void *) &cf_sk->flow_state); | |
110 | } | |
e6f95ec8 | 111 | |
bece7b23 SB |
112 | static void set_tx_flow_on(struct caifsock *cf_sk) |
113 | { | |
114 | set_bit(TX_FLOW_ON_BIT, | |
115 | (void *) &cf_sk->flow_state); | |
116 | } | |
e6f95ec8 | 117 | |
bece7b23 SB |
118 | static void caif_read_lock(struct sock *sk) |
119 | { | |
120 | struct caifsock *cf_sk; | |
121 | cf_sk = container_of(sk, struct caifsock, sk); | |
122 | mutex_lock(&cf_sk->readlock); | |
123 | } | |
e6f95ec8 | 124 | |
bece7b23 SB |
125 | static void caif_read_unlock(struct sock *sk) |
126 | { | |
127 | struct caifsock *cf_sk; | |
128 | cf_sk = container_of(sk, struct caifsock, sk); | |
129 | mutex_unlock(&cf_sk->readlock); | |
130 | } | |
e6f95ec8 | 131 | |
a9a8f107 | 132 | static int sk_rcvbuf_lowwater(struct caifsock *cf_sk) |
bece7b23 SB |
133 | { |
134 | /* A quarter of full buffer is used a low water mark */ | |
135 | return cf_sk->sk.sk_rcvbuf / 4; | |
136 | } | |
e6f95ec8 | 137 | |
a9a8f107 | 138 | static void caif_flow_ctrl(struct sock *sk, int mode) |
bece7b23 SB |
139 | { |
140 | struct caifsock *cf_sk; | |
141 | cf_sk = container_of(sk, struct caifsock, sk); | |
ca6a09f2 | 142 | if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd) |
bece7b23 SB |
143 | cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode); |
144 | } | |
e6f95ec8 | 145 | |
bece7b23 SB |
146 | /* |
147 | * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are | |
148 | * not dropped, but CAIF is sending flow off instead. | |
149 | */ | |
a9a8f107 | 150 | static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
bece7b23 SB |
151 | { |
152 | int err; | |
153 | int skb_len; | |
154 | unsigned long flags; | |
155 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
156 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 157 | |
bece7b23 SB |
158 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
159 | (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) { | |
160 | trace_printk("CAIF: %s():" | |
161 | " sending flow OFF (queue len = %d %d)\n", | |
162 | __func__, | |
163 | atomic_read(&cf_sk->sk.sk_rmem_alloc), | |
164 | sk_rcvbuf_lowwater(cf_sk)); | |
165 | set_rx_flow_off(cf_sk); | |
ca6a09f2 SB |
166 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
167 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 | 168 | } |
e6f95ec8 | 169 | |
bece7b23 SB |
170 | err = sk_filter(sk, skb); |
171 | if (err) | |
172 | return err; | |
173 | if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) { | |
174 | set_rx_flow_off(cf_sk); | |
175 | trace_printk("CAIF: %s():" | |
176 | " sending flow OFF due to rmem_schedule\n", | |
177 | __func__); | |
ca6a09f2 SB |
178 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
179 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 SB |
180 | } |
181 | skb->dev = NULL; | |
182 | skb_set_owner_r(skb, sk); | |
183 | /* Cache the SKB length before we tack it onto the receive | |
184 | * queue. Once it is added it no longer belongs to us and | |
185 | * may be freed by other threads of control pulling packets | |
186 | * from the queue. | |
187 | */ | |
188 | skb_len = skb->len; | |
189 | spin_lock_irqsave(&list->lock, flags); | |
190 | if (!sock_flag(sk, SOCK_DEAD)) | |
191 | __skb_queue_tail(list, skb); | |
192 | spin_unlock_irqrestore(&list->lock, flags); | |
193 | ||
194 | if (!sock_flag(sk, SOCK_DEAD)) | |
195 | sk->sk_data_ready(sk, skb_len); | |
196 | else | |
197 | kfree_skb(skb); | |
e6f95ec8 SB |
198 | return 0; |
199 | } | |
200 | ||
bece7b23 SB |
201 | /* Packet Receive Callback function called from CAIF Stack */ |
202 | static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt) | |
e6f95ec8 SB |
203 | { |
204 | struct caifsock *cf_sk; | |
bece7b23 | 205 | struct sk_buff *skb; |
e6f95ec8 SB |
206 | |
207 | cf_sk = container_of(layr, struct caifsock, layer); | |
bece7b23 SB |
208 | skb = cfpkt_tonative(pkt); |
209 | ||
210 | if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) { | |
211 | cfpkt_destroy(pkt); | |
212 | return 0; | |
213 | } | |
214 | caif_queue_rcv_skb(&cf_sk->sk, skb); | |
215 | return 0; | |
216 | } | |
e6f95ec8 | 217 | |
bece7b23 SB |
218 | /* Packet Control Callback function called from CAIF */ |
219 | static void caif_ctrl_cb(struct cflayer *layr, | |
220 | enum caif_ctrlcmd flow, | |
221 | int phyid) | |
222 | { | |
223 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
e6f95ec8 SB |
224 | switch (flow) { |
225 | case CAIF_CTRLCMD_FLOW_ON_IND: | |
bece7b23 | 226 | /* OK from modem to start sending again */ |
e6f95ec8 | 227 | dbfs_atomic_inc(&cnt.num_tx_flow_on_ind); |
bece7b23 SB |
228 | set_tx_flow_on(cf_sk); |
229 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
230 | break; |
231 | ||
232 | case CAIF_CTRLCMD_FLOW_OFF_IND: | |
bece7b23 | 233 | /* Modem asks us to shut up */ |
e6f95ec8 | 234 | dbfs_atomic_inc(&cnt.num_tx_flow_off_ind); |
bece7b23 SB |
235 | set_tx_flow_off(cf_sk); |
236 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
237 | break; |
238 | ||
239 | case CAIF_CTRLCMD_INIT_RSP: | |
bece7b23 SB |
240 | /* We're now connected */ |
241 | dbfs_atomic_inc(&cnt.num_connect_resp); | |
242 | cf_sk->sk.sk_state = CAIF_CONNECTED; | |
243 | set_tx_flow_on(cf_sk); | |
244 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
245 | break; |
246 | ||
247 | case CAIF_CTRLCMD_DEINIT_RSP: | |
bece7b23 SB |
248 | /* We're now disconnected */ |
249 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
250 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
251 | cfcnfg_release_adap_layer(&cf_sk->layer); | |
e6f95ec8 SB |
252 | break; |
253 | ||
254 | case CAIF_CTRLCMD_INIT_FAIL_RSP: | |
bece7b23 SB |
255 | /* Connect request failed */ |
256 | dbfs_atomic_inc(&cnt.num_connect_fail_resp); | |
257 | cf_sk->sk.sk_err = ECONNREFUSED; | |
258 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
259 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; | |
260 | /* | |
261 | * Socket "standards" seems to require POLLOUT to | |
262 | * be set at connect failure. | |
263 | */ | |
264 | set_tx_flow_on(cf_sk); | |
265 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
266 | break; |
267 | ||
268 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: | |
bece7b23 | 269 | /* Modem has closed this connection, or device is down. */ |
e6f95ec8 | 270 | dbfs_atomic_inc(&cnt.num_remote_shutdown_ind); |
bece7b23 SB |
271 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; |
272 | cf_sk->sk.sk_err = ECONNRESET; | |
273 | set_rx_flow_on(cf_sk); | |
274 | cf_sk->sk.sk_error_report(&cf_sk->sk); | |
e6f95ec8 SB |
275 | break; |
276 | ||
277 | default: | |
278 | pr_debug("CAIF: %s(): Unexpected flow command %d\n", | |
bece7b23 | 279 | __func__, flow); |
e6f95ec8 SB |
280 | } |
281 | } | |
282 | ||
bece7b23 | 283 | static void caif_check_flow_release(struct sock *sk) |
e6f95ec8 | 284 | { |
bece7b23 | 285 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 286 | |
bece7b23 SB |
287 | if (rx_flow_is_on(cf_sk)) |
288 | return; | |
e6f95ec8 | 289 | |
bece7b23 SB |
290 | if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) { |
291 | dbfs_atomic_inc(&cnt.num_rx_flow_on); | |
292 | set_rx_flow_on(cf_sk); | |
ca6a09f2 | 293 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
bece7b23 SB |
294 | } |
295 | } | |
dcda138d | 296 | |
bece7b23 | 297 | /* |
dcda138d SB |
298 | * Copied from unix_dgram_recvmsg, but removed credit checks, |
299 | * changed locking, address handling and added MSG_TRUNC. | |
bece7b23 | 300 | */ |
bece7b23 | 301 | static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock, |
dcda138d | 302 | struct msghdr *m, size_t len, int flags) |
e6f95ec8 SB |
303 | |
304 | { | |
305 | struct sock *sk = sock->sk; | |
e6f95ec8 | 306 | struct sk_buff *skb; |
dcda138d SB |
307 | int ret; |
308 | int copylen; | |
e6f95ec8 | 309 | |
dcda138d SB |
310 | ret = -EOPNOTSUPP; |
311 | if (m->msg_flags&MSG_OOB) | |
312 | goto read_error; | |
e6f95ec8 | 313 | |
bece7b23 SB |
314 | skb = skb_recv_datagram(sk, flags, 0 , &ret); |
315 | if (!skb) | |
e6f95ec8 | 316 | goto read_error; |
dcda138d SB |
317 | copylen = skb->len; |
318 | if (len < copylen) { | |
319 | m->msg_flags |= MSG_TRUNC; | |
320 | copylen = len; | |
e6f95ec8 SB |
321 | } |
322 | ||
dcda138d | 323 | ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen); |
bece7b23 | 324 | if (ret) |
dcda138d | 325 | goto out_free; |
e6f95ec8 | 326 | |
dcda138d SB |
327 | ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
328 | out_free: | |
bece7b23 | 329 | skb_free_datagram(sk, skb); |
bece7b23 | 330 | caif_check_flow_release(sk); |
dcda138d | 331 | return ret; |
e6f95ec8 | 332 | |
bece7b23 SB |
333 | read_error: |
334 | return ret; | |
335 | } | |
e6f95ec8 | 336 | |
e6f95ec8 | 337 | |
bece7b23 SB |
338 | /* Copied from unix_stream_wait_data, identical except for lock call. */ |
339 | static long caif_stream_data_wait(struct sock *sk, long timeo) | |
340 | { | |
341 | DEFINE_WAIT(wait); | |
342 | lock_sock(sk); | |
343 | ||
344 | for (;;) { | |
345 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
346 | ||
347 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
348 | sk->sk_err || | |
349 | sk->sk_state != CAIF_CONNECTED || | |
350 | sock_flag(sk, SOCK_DEAD) || | |
351 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
352 | signal_pending(current) || | |
353 | !timeo) | |
354 | break; | |
e6f95ec8 | 355 | |
bece7b23 SB |
356 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
357 | release_sock(sk); | |
358 | timeo = schedule_timeout(timeo); | |
359 | lock_sock(sk); | |
360 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
e6f95ec8 SB |
361 | } |
362 | ||
bece7b23 SB |
363 | finish_wait(sk_sleep(sk), &wait); |
364 | release_sock(sk); | |
365 | return timeo; | |
366 | } | |
e6f95ec8 SB |
367 | |
368 | ||
bece7b23 SB |
369 | /* |
370 | * Copied from unix_stream_recvmsg, but removed credit checks, | |
371 | * changed locking calls, changed address handling. | |
372 | */ | |
373 | static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
374 | struct msghdr *msg, size_t size, | |
375 | int flags) | |
376 | { | |
377 | struct sock *sk = sock->sk; | |
378 | int copied = 0; | |
379 | int target; | |
380 | int err = 0; | |
381 | long timeo; | |
e6f95ec8 | 382 | |
bece7b23 SB |
383 | err = -EOPNOTSUPP; |
384 | if (flags&MSG_OOB) | |
385 | goto out; | |
e6f95ec8 | 386 | |
bece7b23 | 387 | msg->msg_namelen = 0; |
e6f95ec8 | 388 | |
bece7b23 SB |
389 | /* |
390 | * Lock the socket to prevent queue disordering | |
391 | * while sleeps in memcpy_tomsg | |
392 | */ | |
393 | err = -EAGAIN; | |
394 | if (sk->sk_state == CAIF_CONNECTING) | |
395 | goto out; | |
e6f95ec8 | 396 | |
bece7b23 SB |
397 | caif_read_lock(sk); |
398 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
399 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
e6f95ec8 | 400 | |
bece7b23 SB |
401 | do { |
402 | int chunk; | |
403 | struct sk_buff *skb; | |
e6f95ec8 | 404 | |
bece7b23 SB |
405 | lock_sock(sk); |
406 | skb = skb_dequeue(&sk->sk_receive_queue); | |
407 | caif_check_flow_release(sk); | |
e6f95ec8 | 408 | |
bece7b23 SB |
409 | if (skb == NULL) { |
410 | if (copied >= target) | |
411 | goto unlock; | |
412 | /* | |
413 | * POSIX 1003.1g mandates this order. | |
414 | */ | |
415 | err = sock_error(sk); | |
416 | if (err) | |
417 | goto unlock; | |
418 | err = -ECONNRESET; | |
419 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
420 | goto unlock; | |
e6f95ec8 | 421 | |
bece7b23 SB |
422 | err = -EPIPE; |
423 | if (sk->sk_state != CAIF_CONNECTED) | |
424 | goto unlock; | |
425 | if (sock_flag(sk, SOCK_DEAD)) | |
426 | goto unlock; | |
e6f95ec8 | 427 | |
bece7b23 | 428 | release_sock(sk); |
e6f95ec8 | 429 | |
bece7b23 SB |
430 | err = -EAGAIN; |
431 | if (!timeo) | |
432 | break; | |
e6f95ec8 | 433 | |
bece7b23 | 434 | caif_read_unlock(sk); |
e6f95ec8 | 435 | |
bece7b23 | 436 | timeo = caif_stream_data_wait(sk, timeo); |
e6f95ec8 | 437 | |
bece7b23 SB |
438 | if (signal_pending(current)) { |
439 | err = sock_intr_errno(timeo); | |
440 | goto out; | |
441 | } | |
442 | caif_read_lock(sk); | |
443 | continue; | |
444 | unlock: | |
445 | release_sock(sk); | |
446 | break; | |
e6f95ec8 | 447 | } |
bece7b23 SB |
448 | release_sock(sk); |
449 | chunk = min_t(unsigned int, skb->len, size); | |
450 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
451 | skb_queue_head(&sk->sk_receive_queue, skb); | |
452 | if (copied == 0) | |
453 | copied = -EFAULT; | |
454 | break; | |
455 | } | |
456 | copied += chunk; | |
457 | size -= chunk; | |
e6f95ec8 | 458 | |
bece7b23 SB |
459 | /* Mark read part of skb as used */ |
460 | if (!(flags & MSG_PEEK)) { | |
461 | skb_pull(skb, chunk); | |
e6f95ec8 | 462 | |
bece7b23 SB |
463 | /* put the skb back if we didn't use it up. */ |
464 | if (skb->len) { | |
465 | skb_queue_head(&sk->sk_receive_queue, skb); | |
466 | break; | |
467 | } | |
468 | kfree_skb(skb); | |
e6f95ec8 | 469 | |
e6f95ec8 | 470 | } else { |
bece7b23 SB |
471 | /* |
472 | * It is questionable, see note in unix_dgram_recvmsg. | |
473 | */ | |
474 | /* put message back and return */ | |
475 | skb_queue_head(&sk->sk_receive_queue, skb); | |
476 | break; | |
e6f95ec8 | 477 | } |
bece7b23 SB |
478 | } while (size); |
479 | caif_read_unlock(sk); | |
e6f95ec8 | 480 | |
bece7b23 SB |
481 | out: |
482 | return copied ? : err; | |
483 | } | |
e6f95ec8 | 484 | |
bece7b23 SB |
485 | /* |
486 | * Copied from sock.c:sock_wait_for_wmem, but change to wait for | |
487 | * CAIF flow-on and sock_writable. | |
488 | */ | |
489 | static long caif_wait_for_flow_on(struct caifsock *cf_sk, | |
490 | int wait_writeable, long timeo, int *err) | |
491 | { | |
492 | struct sock *sk = &cf_sk->sk; | |
493 | DEFINE_WAIT(wait); | |
494 | for (;;) { | |
495 | *err = 0; | |
496 | if (tx_flow_is_on(cf_sk) && | |
497 | (!wait_writeable || sock_writeable(&cf_sk->sk))) | |
498 | break; | |
499 | *err = -ETIMEDOUT; | |
500 | if (!timeo) | |
501 | break; | |
502 | *err = -ERESTARTSYS; | |
503 | if (signal_pending(current)) | |
504 | break; | |
505 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
506 | *err = -ECONNRESET; | |
507 | if (sk->sk_shutdown & SHUTDOWN_MASK) | |
508 | break; | |
509 | *err = -sk->sk_err; | |
510 | if (sk->sk_err) | |
511 | break; | |
512 | *err = -EPIPE; | |
513 | if (cf_sk->sk.sk_state != CAIF_CONNECTED) | |
514 | break; | |
515 | timeo = schedule_timeout(timeo); | |
e6f95ec8 | 516 | } |
bece7b23 SB |
517 | finish_wait(sk_sleep(sk), &wait); |
518 | return timeo; | |
519 | } | |
e6f95ec8 | 520 | |
bece7b23 SB |
521 | /* |
522 | * Transmit a SKB. The device may temporarily request re-transmission | |
523 | * by returning EAGAIN. | |
524 | */ | |
525 | static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, | |
526 | int noblock, long timeo) | |
527 | { | |
528 | struct cfpkt *pkt; | |
529 | int ret, loopcnt = 0; | |
e6f95ec8 | 530 | |
bece7b23 SB |
531 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
532 | memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); | |
533 | do { | |
e6f95ec8 | 534 | |
bece7b23 | 535 | ret = -ETIMEDOUT; |
e6f95ec8 | 536 | |
bece7b23 SB |
537 | /* Slight paranoia, probably not needed. */ |
538 | if (unlikely(loopcnt++ > 1000)) { | |
539 | pr_warning("CAIF: %s(): transmit retries failed," | |
540 | " error = %d\n", __func__, ret); | |
541 | break; | |
e6f95ec8 SB |
542 | } |
543 | ||
bece7b23 SB |
544 | if (cf_sk->layer.dn != NULL) |
545 | ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); | |
546 | if (likely(ret >= 0)) | |
547 | break; | |
548 | /* if transmit return -EAGAIN, then retry */ | |
549 | if (noblock && ret == -EAGAIN) | |
550 | break; | |
551 | timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret); | |
552 | if (signal_pending(current)) { | |
553 | ret = sock_intr_errno(timeo); | |
554 | break; | |
e6f95ec8 | 555 | } |
bece7b23 SB |
556 | if (ret) |
557 | break; | |
558 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
559 | sock_flag(&cf_sk->sk, SOCK_DEAD) || | |
560 | (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) { | |
561 | ret = -EPIPE; | |
562 | cf_sk->sk.sk_err = EPIPE; | |
563 | break; | |
e6f95ec8 | 564 | } |
bece7b23 SB |
565 | } while (ret == -EAGAIN); |
566 | return ret; | |
567 | } | |
e6f95ec8 | 568 | |
bece7b23 SB |
569 | /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ |
570 | static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
571 | struct msghdr *msg, size_t len) | |
572 | { | |
573 | struct sock *sk = sock->sk; | |
574 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
575 | int buffer_size; | |
576 | int ret = 0; | |
577 | struct sk_buff *skb = NULL; | |
578 | int noblock; | |
579 | long timeo; | |
580 | caif_assert(cf_sk); | |
581 | ret = sock_error(sk); | |
582 | if (ret) | |
583 | goto err; | |
584 | ||
585 | ret = -EOPNOTSUPP; | |
586 | if (msg->msg_flags&MSG_OOB) | |
587 | goto err; | |
588 | ||
589 | ret = -EOPNOTSUPP; | |
590 | if (msg->msg_namelen) | |
591 | goto err; | |
592 | ||
593 | ret = -EINVAL; | |
594 | if (unlikely(msg->msg_iov->iov_base == NULL)) | |
595 | goto err; | |
596 | noblock = msg->msg_flags & MSG_DONTWAIT; | |
597 | ||
bece7b23 SB |
598 | timeo = sock_sndtimeo(sk, noblock); |
599 | timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), | |
600 | 1, timeo, &ret); | |
601 | ||
2aa40aef SB |
602 | if (ret) |
603 | goto err; | |
bece7b23 SB |
604 | ret = -EPIPE; |
605 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
606 | sock_flag(sk, SOCK_DEAD) || | |
607 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
608 | goto err; | |
609 | ||
2aa40aef SB |
610 | /* Error if trying to write more than maximum frame size. */ |
611 | ret = -EMSGSIZE; | |
612 | if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM) | |
613 | goto err; | |
614 | ||
615 | buffer_size = len + cf_sk->headroom + cf_sk->tailroom; | |
616 | ||
bece7b23 SB |
617 | ret = -ENOMEM; |
618 | skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); | |
2aa40aef SB |
619 | |
620 | if (!skb || skb_tailroom(skb) < buffer_size) | |
bece7b23 | 621 | goto err; |
2aa40aef SB |
622 | |
623 | skb_reserve(skb, cf_sk->headroom); | |
bece7b23 SB |
624 | |
625 | ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
626 | ||
627 | if (ret) | |
628 | goto err; | |
629 | ret = transmit_skb(skb, cf_sk, noblock, timeo); | |
630 | if (ret < 0) | |
631 | goto err; | |
632 | return len; | |
633 | err: | |
634 | kfree_skb(skb); | |
635 | return ret; | |
636 | } | |
e6f95ec8 | 637 | |
bece7b23 SB |
638 | /* |
639 | * Copied from unix_stream_sendmsg and adapted to CAIF: | |
640 | * Changed removed permission handling and added waiting for flow on | |
641 | * and other minor adaptations. | |
642 | */ | |
643 | static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
644 | struct msghdr *msg, size_t len) | |
645 | { | |
646 | struct sock *sk = sock->sk; | |
647 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
648 | int err, size; | |
649 | struct sk_buff *skb; | |
650 | int sent = 0; | |
651 | long timeo; | |
e6f95ec8 | 652 | |
bece7b23 | 653 | err = -EOPNOTSUPP; |
bece7b23 SB |
654 | if (unlikely(msg->msg_flags&MSG_OOB)) |
655 | goto out_err; | |
e6f95ec8 | 656 | |
bece7b23 SB |
657 | if (unlikely(msg->msg_namelen)) |
658 | goto out_err; | |
e6f95ec8 | 659 | |
bece7b23 SB |
660 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
661 | timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err); | |
e6f95ec8 | 662 | |
bece7b23 SB |
663 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) |
664 | goto pipe_err; | |
e6f95ec8 | 665 | |
bece7b23 | 666 | while (sent < len) { |
e6f95ec8 | 667 | |
bece7b23 | 668 | size = len-sent; |
e6f95ec8 | 669 | |
2aa40aef SB |
670 | if (size > cf_sk->maxframe) |
671 | size = cf_sk->maxframe; | |
e6f95ec8 | 672 | |
bece7b23 SB |
673 | /* If size is more than half of sndbuf, chop up message */ |
674 | if (size > ((sk->sk_sndbuf >> 1) - 64)) | |
675 | size = (sk->sk_sndbuf >> 1) - 64; | |
e6f95ec8 | 676 | |
bece7b23 SB |
677 | if (size > SKB_MAX_ALLOC) |
678 | size = SKB_MAX_ALLOC; | |
e6f95ec8 | 679 | |
bece7b23 | 680 | skb = sock_alloc_send_skb(sk, |
2aa40aef SB |
681 | size + cf_sk->headroom + |
682 | cf_sk->tailroom, | |
bece7b23 SB |
683 | msg->msg_flags&MSG_DONTWAIT, |
684 | &err); | |
685 | if (skb == NULL) | |
686 | goto out_err; | |
e6f95ec8 | 687 | |
2aa40aef | 688 | skb_reserve(skb, cf_sk->headroom); |
bece7b23 SB |
689 | /* |
690 | * If you pass two values to the sock_alloc_send_skb | |
691 | * it tries to grab the large buffer with GFP_NOFS | |
692 | * (which can fail easily), and if it fails grab the | |
693 | * fallback size buffer which is under a page and will | |
694 | * succeed. [Alan] | |
695 | */ | |
696 | size = min_t(int, size, skb_tailroom(skb)); | |
e6f95ec8 | 697 | |
bece7b23 SB |
698 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
699 | if (err) { | |
700 | kfree_skb(skb); | |
701 | goto out_err; | |
702 | } | |
703 | err = transmit_skb(skb, cf_sk, | |
704 | msg->msg_flags&MSG_DONTWAIT, timeo); | |
705 | if (err < 0) { | |
706 | kfree_skb(skb); | |
707 | goto pipe_err; | |
708 | } | |
709 | sent += size; | |
e6f95ec8 | 710 | } |
e6f95ec8 | 711 | |
bece7b23 | 712 | return sent; |
e6f95ec8 | 713 | |
bece7b23 SB |
714 | pipe_err: |
715 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
716 | send_sig(SIGPIPE, current, 0); | |
717 | err = -EPIPE; | |
718 | out_err: | |
719 | return sent ? : err; | |
e6f95ec8 SB |
720 | } |
721 | ||
722 | static int setsockopt(struct socket *sock, | |
723 | int lvl, int opt, char __user *ov, unsigned int ol) | |
724 | { | |
725 | struct sock *sk = sock->sk; | |
726 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
727 | int prio, linksel; | |
728 | struct ifreq ifreq; | |
729 | ||
bece7b23 | 730 | if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED) |
e6f95ec8 | 731 | return -ENOPROTOOPT; |
bece7b23 | 732 | |
e6f95ec8 SB |
733 | switch (opt) { |
734 | case CAIFSO_LINK_SELECT: | |
bece7b23 | 735 | if (ol < sizeof(int)) |
e6f95ec8 | 736 | return -EINVAL; |
e6f95ec8 SB |
737 | if (lvl != SOL_CAIF) |
738 | goto bad_sol; | |
739 | if (copy_from_user(&linksel, ov, sizeof(int))) | |
740 | return -EINVAL; | |
741 | lock_sock(&(cf_sk->sk)); | |
742 | cf_sk->conn_req.link_selector = linksel; | |
743 | release_sock(&cf_sk->sk); | |
744 | return 0; | |
745 | ||
746 | case SO_PRIORITY: | |
747 | if (lvl != SOL_SOCKET) | |
748 | goto bad_sol; | |
bece7b23 | 749 | if (ol < sizeof(int)) |
e6f95ec8 | 750 | return -EINVAL; |
e6f95ec8 SB |
751 | if (copy_from_user(&prio, ov, sizeof(int))) |
752 | return -EINVAL; | |
753 | lock_sock(&(cf_sk->sk)); | |
754 | cf_sk->conn_req.priority = prio; | |
e6f95ec8 SB |
755 | release_sock(&cf_sk->sk); |
756 | return 0; | |
757 | ||
758 | case SO_BINDTODEVICE: | |
759 | if (lvl != SOL_SOCKET) | |
760 | goto bad_sol; | |
bece7b23 | 761 | if (ol < sizeof(struct ifreq)) |
e6f95ec8 | 762 | return -EINVAL; |
e6f95ec8 SB |
763 | if (copy_from_user(&ifreq, ov, sizeof(ifreq))) |
764 | return -EFAULT; | |
765 | lock_sock(&(cf_sk->sk)); | |
766 | strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name, | |
767 | sizeof(cf_sk->conn_req.link_name)); | |
768 | cf_sk->conn_req.link_name | |
769 | [sizeof(cf_sk->conn_req.link_name)-1] = 0; | |
770 | release_sock(&cf_sk->sk); | |
771 | return 0; | |
772 | ||
773 | case CAIFSO_REQ_PARAM: | |
774 | if (lvl != SOL_CAIF) | |
775 | goto bad_sol; | |
776 | if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL) | |
777 | return -ENOPROTOOPT; | |
e6f95ec8 SB |
778 | lock_sock(&(cf_sk->sk)); |
779 | cf_sk->conn_req.param.size = ol; | |
bece7b23 SB |
780 | if (ol > sizeof(cf_sk->conn_req.param.data) || |
781 | copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) { | |
e6f95ec8 | 782 | release_sock(&cf_sk->sk); |
e6f95ec8 SB |
783 | return -EINVAL; |
784 | } | |
e6f95ec8 SB |
785 | release_sock(&cf_sk->sk); |
786 | return 0; | |
787 | ||
788 | default: | |
bece7b23 | 789 | return -ENOPROTOOPT; |
e6f95ec8 SB |
790 | } |
791 | ||
792 | return 0; | |
793 | bad_sol: | |
e6f95ec8 SB |
794 | return -ENOPROTOOPT; |
795 | ||
796 | } | |
797 | ||
bece7b23 SB |
798 | /* |
799 | * caif_connect() - Connect a CAIF Socket | |
800 | * Copied and modified af_irda.c:irda_connect(). | |
801 | * | |
802 | * Note : by consulting "errno", the user space caller may learn the cause | |
803 | * of the failure. Most of them are visible in the function, others may come | |
804 | * from subroutines called and are listed here : | |
805 | * o -EAFNOSUPPORT: bad socket family or type. | |
806 | * o -ESOCKTNOSUPPORT: bad socket type or protocol | |
807 | * o -EINVAL: bad socket address, or CAIF link type | |
808 | * o -ECONNREFUSED: remote end refused the connection. | |
809 | * o -EINPROGRESS: connect request sent but timed out (or non-blocking) | |
810 | * o -EISCONN: already connected. | |
811 | * o -ETIMEDOUT: Connection timed out (send timeout) | |
812 | * o -ENODEV: No link layer to send request | |
813 | * o -ECONNRESET: Received Shutdown indication or lost link layer | |
814 | * o -ENOMEM: Out of memory | |
815 | * | |
816 | * State Strategy: | |
817 | * o sk_state: holds the CAIF_* protocol state, it's updated by | |
818 | * caif_ctrl_cb. | |
819 | * o sock->state: holds the SS_* socket state and is updated by connect and | |
820 | * disconnect. | |
821 | */ | |
822 | static int caif_connect(struct socket *sock, struct sockaddr *uaddr, | |
823 | int addr_len, int flags) | |
e6f95ec8 | 824 | { |
e6f95ec8 | 825 | struct sock *sk = sock->sk; |
bece7b23 SB |
826 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
827 | long timeo; | |
828 | int err; | |
2aa40aef SB |
829 | int ifindex, headroom, tailroom; |
830 | struct net_device *dev; | |
831 | ||
bece7b23 | 832 | lock_sock(sk); |
e6f95ec8 | 833 | |
bece7b23 SB |
834 | err = -EAFNOSUPPORT; |
835 | if (uaddr->sa_family != AF_CAIF) | |
e6f95ec8 SB |
836 | goto out; |
837 | ||
bece7b23 SB |
838 | switch (sock->state) { |
839 | case SS_UNCONNECTED: | |
840 | /* Normal case, a fresh connect */ | |
841 | caif_assert(sk->sk_state == CAIF_DISCONNECTED); | |
842 | break; | |
843 | case SS_CONNECTING: | |
844 | switch (sk->sk_state) { | |
845 | case CAIF_CONNECTED: | |
846 | sock->state = SS_CONNECTED; | |
847 | err = -EISCONN; | |
848 | goto out; | |
849 | case CAIF_DISCONNECTED: | |
850 | /* Reconnect allowed */ | |
851 | break; | |
852 | case CAIF_CONNECTING: | |
853 | err = -EALREADY; | |
854 | if (flags & O_NONBLOCK) | |
855 | goto out; | |
856 | goto wait_connect; | |
857 | } | |
858 | break; | |
859 | case SS_CONNECTED: | |
860 | caif_assert(sk->sk_state == CAIF_CONNECTED || | |
861 | sk->sk_state == CAIF_DISCONNECTED); | |
862 | if (sk->sk_shutdown & SHUTDOWN_MASK) { | |
863 | /* Allow re-connect after SHUTDOWN_IND */ | |
864 | caif_disconnect_client(&cf_sk->layer); | |
865 | break; | |
866 | } | |
867 | /* No reconnect on a seqpacket socket */ | |
868 | err = -EISCONN; | |
869 | goto out; | |
870 | case SS_DISCONNECTING: | |
871 | case SS_FREE: | |
872 | caif_assert(1); /*Should never happen */ | |
873 | break; | |
e6f95ec8 | 874 | } |
bece7b23 SB |
875 | sk->sk_state = CAIF_DISCONNECTED; |
876 | sock->state = SS_UNCONNECTED; | |
877 | sk_stream_kill_queues(&cf_sk->sk); | |
e6f95ec8 | 878 | |
bece7b23 | 879 | err = -EINVAL; |
f5d72af9 | 880 | if (addr_len != sizeof(struct sockaddr_caif)) |
bece7b23 | 881 | goto out; |
e6f95ec8 | 882 | |
bece7b23 | 883 | memcpy(&cf_sk->conn_req.sockaddr, uaddr, |
e6f95ec8 SB |
884 | sizeof(struct sockaddr_caif)); |
885 | ||
bece7b23 SB |
886 | /* Move to connecting socket, start sending Connect Requests */ |
887 | sock->state = SS_CONNECTING; | |
888 | sk->sk_state = CAIF_CONNECTING; | |
889 | ||
890 | dbfs_atomic_inc(&cnt.num_connect_req); | |
891 | cf_sk->layer.receive = caif_sktrecv_cb; | |
892 | err = caif_connect_client(&cf_sk->conn_req, | |
2aa40aef | 893 | &cf_sk->layer, &ifindex, &headroom, &tailroom); |
bece7b23 SB |
894 | if (err < 0) { |
895 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
896 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
897 | goto out; | |
e6f95ec8 | 898 | } |
2aa40aef SB |
899 | dev = dev_get_by_index(sock_net(sk), ifindex); |
900 | cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom); | |
901 | cf_sk->tailroom = tailroom; | |
902 | cf_sk->maxframe = dev->mtu - (headroom + tailroom); | |
903 | dev_put(dev); | |
904 | if (cf_sk->maxframe < 1) { | |
905 | pr_warning("CAIF: %s(): CAIF Interface MTU too small (%d)\n", | |
906 | __func__, dev->mtu); | |
907 | err = -ENODEV; | |
908 | goto out; | |
909 | } | |
e6f95ec8 | 910 | |
bece7b23 SB |
911 | err = -EINPROGRESS; |
912 | wait_connect: | |
e6f95ec8 | 913 | |
bece7b23 SB |
914 | if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK)) |
915 | goto out; | |
e6f95ec8 | 916 | |
bece7b23 SB |
917 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
918 | ||
919 | release_sock(sk); | |
9e4b816b SB |
920 | err = -ERESTARTSYS; |
921 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), | |
bece7b23 SB |
922 | sk->sk_state != CAIF_CONNECTING, |
923 | timeo); | |
924 | lock_sock(sk); | |
9e4b816b | 925 | if (timeo < 0) |
bece7b23 | 926 | goto out; /* -ERESTARTSYS */ |
e6f95ec8 | 927 | |
9e4b816b SB |
928 | err = -ETIMEDOUT; |
929 | if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) | |
930 | goto out; | |
bece7b23 SB |
931 | if (sk->sk_state != CAIF_CONNECTED) { |
932 | sock->state = SS_UNCONNECTED; | |
933 | err = sock_error(sk); | |
934 | if (!err) | |
935 | err = -ECONNREFUSED; | |
936 | goto out; | |
937 | } | |
938 | sock->state = SS_CONNECTED; | |
939 | err = 0; | |
e6f95ec8 | 940 | out: |
bece7b23 SB |
941 | release_sock(sk); |
942 | return err; | |
e6f95ec8 SB |
943 | } |
944 | ||
bece7b23 SB |
945 | /* |
946 | * caif_release() - Disconnect a CAIF Socket | |
947 | * Copied and modified af_irda.c:irda_release(). | |
948 | */ | |
949 | static int caif_release(struct socket *sock) | |
e6f95ec8 | 950 | { |
e6f95ec8 | 951 | struct sock *sk = sock->sk; |
bece7b23 SB |
952 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
953 | int res = 0; | |
e6f95ec8 | 954 | |
bece7b23 SB |
955 | if (!sk) |
956 | return 0; | |
e6f95ec8 | 957 | |
bece7b23 | 958 | set_tx_flow_off(cf_sk); |
e6f95ec8 SB |
959 | |
960 | /* | |
bece7b23 SB |
961 | * Ensure that packets are not queued after this point in time. |
962 | * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock, | |
963 | * this ensures no packets when sock is dead. | |
e6f95ec8 | 964 | */ |
bece7b23 SB |
965 | spin_lock(&sk->sk_receive_queue.lock); |
966 | sock_set_flag(sk, SOCK_DEAD); | |
967 | spin_unlock(&sk->sk_receive_queue.lock); | |
968 | sock->sk = NULL; | |
e6f95ec8 | 969 | |
bece7b23 | 970 | dbfs_atomic_inc(&cnt.num_disconnect); |
e6f95ec8 SB |
971 | |
972 | if (cf_sk->debugfs_socket_dir != NULL) | |
973 | debugfs_remove_recursive(cf_sk->debugfs_socket_dir); | |
974 | ||
e6f95ec8 | 975 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
976 | sk->sk_state = CAIF_DISCONNECTED; |
977 | sk->sk_shutdown = SHUTDOWN_MASK; | |
e6f95ec8 | 978 | |
bece7b23 SB |
979 | if (cf_sk->sk.sk_socket->state == SS_CONNECTED || |
980 | cf_sk->sk.sk_socket->state == SS_CONNECTING) | |
981 | res = caif_disconnect_client(&cf_sk->layer); | |
e6f95ec8 | 982 | |
bece7b23 SB |
983 | cf_sk->sk.sk_socket->state = SS_DISCONNECTING; |
984 | wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP); | |
e6f95ec8 | 985 | |
bece7b23 SB |
986 | sock_orphan(sk); |
987 | cf_sk->layer.dn = NULL; | |
988 | sk_stream_kill_queues(&cf_sk->sk); | |
989 | release_sock(sk); | |
990 | sock_put(sk); | |
991 | return res; | |
992 | } | |
e6f95ec8 | 993 | |
bece7b23 SB |
994 | /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */ |
995 | static unsigned int caif_poll(struct file *file, | |
996 | struct socket *sock, poll_table *wait) | |
997 | { | |
998 | struct sock *sk = sock->sk; | |
999 | unsigned int mask; | |
1000 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 1001 | |
bece7b23 SB |
1002 | sock_poll_wait(file, sk_sleep(sk), wait); |
1003 | mask = 0; | |
e6f95ec8 | 1004 | |
bece7b23 SB |
1005 | /* exceptional events? */ |
1006 | if (sk->sk_err) | |
1007 | mask |= POLLERR; | |
1008 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1009 | mask |= POLLHUP; | |
1010 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1011 | mask |= POLLRDHUP; | |
e6f95ec8 | 1012 | |
bece7b23 SB |
1013 | /* readable? */ |
1014 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1015 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1016 | mask |= POLLIN | POLLRDNORM; | |
e6f95ec8 | 1017 | |
e6f95ec8 | 1018 | /* |
bece7b23 SB |
1019 | * we set writable also when the other side has shut down the |
1020 | * connection. This prevents stuck sockets. | |
e6f95ec8 | 1021 | */ |
bece7b23 SB |
1022 | if (sock_writeable(sk) && tx_flow_is_on(cf_sk)) |
1023 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1024 | ||
1025 | return mask; | |
e6f95ec8 SB |
1026 | } |
1027 | ||
bece7b23 SB |
1028 | static const struct proto_ops caif_seqpacket_ops = { |
1029 | .family = PF_CAIF, | |
1030 | .owner = THIS_MODULE, | |
1031 | .release = caif_release, | |
1032 | .bind = sock_no_bind, | |
1033 | .connect = caif_connect, | |
1034 | .socketpair = sock_no_socketpair, | |
1035 | .accept = sock_no_accept, | |
1036 | .getname = sock_no_getname, | |
1037 | .poll = caif_poll, | |
1038 | .ioctl = sock_no_ioctl, | |
1039 | .listen = sock_no_listen, | |
1040 | .shutdown = sock_no_shutdown, | |
1041 | .setsockopt = setsockopt, | |
1042 | .getsockopt = sock_no_getsockopt, | |
1043 | .sendmsg = caif_seqpkt_sendmsg, | |
1044 | .recvmsg = caif_seqpkt_recvmsg, | |
1045 | .mmap = sock_no_mmap, | |
1046 | .sendpage = sock_no_sendpage, | |
1047 | }; | |
1048 | ||
1049 | static const struct proto_ops caif_stream_ops = { | |
e6f95ec8 SB |
1050 | .family = PF_CAIF, |
1051 | .owner = THIS_MODULE, | |
1052 | .release = caif_release, | |
1053 | .bind = sock_no_bind, | |
1054 | .connect = caif_connect, | |
1055 | .socketpair = sock_no_socketpair, | |
1056 | .accept = sock_no_accept, | |
1057 | .getname = sock_no_getname, | |
1058 | .poll = caif_poll, | |
1059 | .ioctl = sock_no_ioctl, | |
1060 | .listen = sock_no_listen, | |
bece7b23 | 1061 | .shutdown = sock_no_shutdown, |
e6f95ec8 SB |
1062 | .setsockopt = setsockopt, |
1063 | .getsockopt = sock_no_getsockopt, | |
bece7b23 SB |
1064 | .sendmsg = caif_stream_sendmsg, |
1065 | .recvmsg = caif_stream_recvmsg, | |
e6f95ec8 | 1066 | .mmap = sock_no_mmap, |
bece7b23 | 1067 | .sendpage = sock_no_sendpage, |
e6f95ec8 SB |
1068 | }; |
1069 | ||
1070 | /* This function is called when a socket is finally destroyed. */ | |
1071 | static void caif_sock_destructor(struct sock *sk) | |
1072 | { | |
bece7b23 | 1073 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 SB |
1074 | caif_assert(!atomic_read(&sk->sk_wmem_alloc)); |
1075 | caif_assert(sk_unhashed(sk)); | |
1076 | caif_assert(!sk->sk_socket); | |
1077 | if (!sock_flag(sk, SOCK_DEAD)) { | |
bece7b23 | 1078 | pr_info("Attempt to release alive CAIF socket: %p\n", sk); |
e6f95ec8 SB |
1079 | return; |
1080 | } | |
bece7b23 SB |
1081 | sk_stream_kill_queues(&cf_sk->sk); |
1082 | dbfs_atomic_dec(&cnt.caif_nr_socks); | |
e6f95ec8 SB |
1083 | } |
1084 | ||
1085 | static int caif_create(struct net *net, struct socket *sock, int protocol, | |
bece7b23 | 1086 | int kern) |
e6f95ec8 SB |
1087 | { |
1088 | struct sock *sk = NULL; | |
1089 | struct caifsock *cf_sk = NULL; | |
e6f95ec8 SB |
1090 | static struct proto prot = {.name = "PF_CAIF", |
1091 | .owner = THIS_MODULE, | |
1092 | .obj_size = sizeof(struct caifsock), | |
1093 | }; | |
1094 | ||
bece7b23 SB |
1095 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) |
1096 | return -EPERM; | |
e6f95ec8 SB |
1097 | /* |
1098 | * The sock->type specifies the socket type to use. | |
bece7b23 SB |
1099 | * The CAIF socket is a packet stream in the sense |
1100 | * that it is packet based. CAIF trusts the reliability | |
1101 | * of the link, no resending is implemented. | |
e6f95ec8 | 1102 | */ |
bece7b23 SB |
1103 | if (sock->type == SOCK_SEQPACKET) |
1104 | sock->ops = &caif_seqpacket_ops; | |
1105 | else if (sock->type == SOCK_STREAM) | |
1106 | sock->ops = &caif_stream_ops; | |
1107 | else | |
e6f95ec8 SB |
1108 | return -ESOCKTNOSUPPORT; |
1109 | ||
e6f95ec8 SB |
1110 | if (protocol < 0 || protocol >= CAIFPROTO_MAX) |
1111 | return -EPROTONOSUPPORT; | |
1112 | /* | |
bece7b23 SB |
1113 | * Set the socket state to unconnected. The socket state |
1114 | * is really not used at all in the net/core or socket.c but the | |
e6f95ec8 SB |
1115 | * initialization makes sure that sock->state is not uninitialized. |
1116 | */ | |
e6f95ec8 SB |
1117 | sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot); |
1118 | if (!sk) | |
1119 | return -ENOMEM; | |
1120 | ||
1121 | cf_sk = container_of(sk, struct caifsock, sk); | |
1122 | ||
1123 | /* Store the protocol */ | |
1124 | sk->sk_protocol = (unsigned char) protocol; | |
1125 | ||
bece7b23 SB |
1126 | /* Sendbuf dictates the amount of outbound packets not yet sent */ |
1127 | sk->sk_sndbuf = CAIF_DEF_SNDBUF; | |
1128 | sk->sk_rcvbuf = CAIF_DEF_RCVBUF; | |
e6f95ec8 SB |
1129 | |
1130 | /* | |
1131 | * Lock in order to try to stop someone from opening the socket | |
1132 | * too early. | |
1133 | */ | |
1134 | lock_sock(&(cf_sk->sk)); | |
1135 | ||
1136 | /* Initialize the nozero default sock structure data. */ | |
1137 | sock_init_data(sock, sk); | |
e6f95ec8 | 1138 | sk->sk_destruct = caif_sock_destructor; |
e6f95ec8 | 1139 | |
bece7b23 SB |
1140 | mutex_init(&cf_sk->readlock); /* single task reading lock */ |
1141 | cf_sk->layer.ctrlcmd = caif_ctrl_cb; | |
1142 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
1143 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
e6f95ec8 | 1144 | |
bece7b23 SB |
1145 | set_tx_flow_off(cf_sk); |
1146 | set_rx_flow_on(cf_sk); | |
e6f95ec8 SB |
1147 | |
1148 | /* Set default options on configuration */ | |
1149 | cf_sk->conn_req.priority = CAIF_PRIO_NORMAL; | |
bece7b23 | 1150 | cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY; |
e6f95ec8 SB |
1151 | cf_sk->conn_req.protocol = protocol; |
1152 | /* Increase the number of sockets created. */ | |
bece7b23 SB |
1153 | dbfs_atomic_inc(&cnt.caif_nr_socks); |
1154 | #ifdef CONFIG_DEBUG_FS | |
e6f95ec8 | 1155 | if (!IS_ERR(debugfsdir)) { |
bece7b23 SB |
1156 | /* Fill in some information concerning the misc socket. */ |
1157 | snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", | |
1158 | atomic_read(&cnt.caif_nr_socks)); | |
1159 | ||
e6f95ec8 SB |
1160 | cf_sk->debugfs_socket_dir = |
1161 | debugfs_create_dir(cf_sk->name, debugfsdir); | |
bece7b23 SB |
1162 | debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR, |
1163 | cf_sk->debugfs_socket_dir, | |
1164 | (u32 *) &cf_sk->sk.sk_state); | |
e6f95ec8 SB |
1165 | debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR, |
1166 | cf_sk->debugfs_socket_dir, &cf_sk->flow_state); | |
bece7b23 SB |
1167 | debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR, |
1168 | cf_sk->debugfs_socket_dir, | |
1169 | (u32 *) &cf_sk->sk.sk_rmem_alloc); | |
1170 | debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1171 | cf_sk->debugfs_socket_dir, |
bece7b23 | 1172 | (u32 *) &cf_sk->sk.sk_wmem_alloc); |
e6f95ec8 SB |
1173 | debugfs_create_u32("identity", S_IRUSR | S_IWUSR, |
1174 | cf_sk->debugfs_socket_dir, | |
1175 | (u32 *) &cf_sk->layer.id); | |
1176 | } | |
bece7b23 | 1177 | #endif |
e6f95ec8 SB |
1178 | release_sock(&cf_sk->sk); |
1179 | return 0; | |
e6f95ec8 SB |
1180 | } |
1181 | ||
bece7b23 | 1182 | |
e6f95ec8 SB |
1183 | static struct net_proto_family caif_family_ops = { |
1184 | .family = PF_CAIF, | |
1185 | .create = caif_create, | |
1186 | .owner = THIS_MODULE, | |
1187 | }; | |
1188 | ||
a9a8f107 | 1189 | static int af_caif_init(void) |
e6f95ec8 | 1190 | { |
bece7b23 | 1191 | int err = sock_register(&caif_family_ops); |
e6f95ec8 SB |
1192 | if (!err) |
1193 | return err; | |
e6f95ec8 SB |
1194 | return 0; |
1195 | } | |
1196 | ||
1197 | static int __init caif_sktinit_module(void) | |
1198 | { | |
e6f95ec8 | 1199 | #ifdef CONFIG_DEBUG_FS |
bece7b23 | 1200 | debugfsdir = debugfs_create_dir("caif_sk", NULL); |
e6f95ec8 | 1201 | if (!IS_ERR(debugfsdir)) { |
e6f95ec8 SB |
1202 | debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR, |
1203 | debugfsdir, | |
bece7b23 SB |
1204 | (u32 *) &cnt.caif_nr_socks); |
1205 | debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1206 | debugfsdir, |
bece7b23 SB |
1207 | (u32 *) &cnt.num_connect_req); |
1208 | debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1209 | debugfsdir, |
bece7b23 SB |
1210 | (u32 *) &cnt.num_connect_resp); |
1211 | debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1212 | debugfsdir, |
bece7b23 SB |
1213 | (u32 *) &cnt.num_connect_fail_resp); |
1214 | debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1215 | debugfsdir, |
bece7b23 | 1216 | (u32 *) &cnt.num_disconnect); |
e6f95ec8 SB |
1217 | debugfs_create_u32("num_remote_shutdown_ind", |
1218 | S_IRUSR | S_IWUSR, debugfsdir, | |
1219 | (u32 *) &cnt.num_remote_shutdown_ind); | |
1220 | debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR, | |
1221 | debugfsdir, | |
1222 | (u32 *) &cnt.num_tx_flow_off_ind); | |
1223 | debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR, | |
1224 | debugfsdir, | |
1225 | (u32 *) &cnt.num_tx_flow_on_ind); | |
1226 | debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR, | |
1227 | debugfsdir, | |
1228 | (u32 *) &cnt.num_rx_flow_off); | |
1229 | debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR, | |
1230 | debugfsdir, | |
1231 | (u32 *) &cnt.num_rx_flow_on); | |
1232 | } | |
1233 | #endif | |
bece7b23 | 1234 | return af_caif_init(); |
e6f95ec8 SB |
1235 | } |
1236 | ||
1237 | static void __exit caif_sktexit_module(void) | |
1238 | { | |
1239 | sock_unregister(PF_CAIF); | |
1240 | if (debugfsdir != NULL) | |
1241 | debugfs_remove_recursive(debugfsdir); | |
1242 | } | |
e6f95ec8 SB |
1243 | module_init(caif_sktinit_module); |
1244 | module_exit(caif_sktexit_module); |