Commit | Line | Data |
---|---|---|
e6f95ec8 SB |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
26ee65e6 | 3 | * Author: Sjur Brendeland |
e6f95ec8 SB |
4 | * License terms: GNU General Public License (GPL) version 2 |
5 | */ | |
6 | ||
b31fa5ba JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
8 | ||
e6f95ec8 SB |
9 | #include <linux/fs.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/poll.h> | |
18 | #include <linux/tcp.h> | |
19 | #include <linux/uaccess.h> | |
bece7b23 | 20 | #include <linux/debugfs.h> |
e6f95ec8 | 21 | #include <linux/caif/caif_socket.h> |
44764812 | 22 | #include <linux/pkt_sched.h> |
bece7b23 SB |
23 | #include <net/sock.h> |
24 | #include <net/tcp_states.h> | |
e6f95ec8 SB |
25 | #include <net/caif/caif_layer.h> |
26 | #include <net/caif/caif_dev.h> | |
27 | #include <net/caif/cfpkt.h> | |
28 | ||
29 | MODULE_LICENSE("GPL"); | |
bece7b23 SB |
30 | MODULE_ALIAS_NETPROTO(AF_CAIF); |
31 | ||
bece7b23 SB |
32 | /* |
33 | * CAIF state is re-using the TCP socket states. | |
34 | * caif_states stored in sk_state reflect the state as reported by | |
35 | * the CAIF stack, while sk_socket->state is the state of the socket. | |
36 | */ | |
37 | enum caif_states { | |
38 | CAIF_CONNECTED = TCP_ESTABLISHED, | |
39 | CAIF_CONNECTING = TCP_SYN_SENT, | |
40 | CAIF_DISCONNECTED = TCP_CLOSE | |
41 | }; | |
42 | ||
43 | #define TX_FLOW_ON_BIT 1 | |
44 | #define RX_FLOW_ON_BIT 2 | |
e6f95ec8 | 45 | |
e6f95ec8 | 46 | struct caifsock { |
bece7b23 | 47 | struct sock sk; /* must be first member */ |
e6f95ec8 | 48 | struct cflayer layer; |
e6f95ec8 | 49 | u32 flow_state; |
e6f95ec8 | 50 | struct caif_connect_request conn_req; |
bece7b23 | 51 | struct mutex readlock; |
e6f95ec8 | 52 | struct dentry *debugfs_socket_dir; |
2aa40aef | 53 | int headroom, tailroom, maxframe; |
e6f95ec8 SB |
54 | }; |
55 | ||
bece7b23 SB |
56 | static int rx_flow_is_on(struct caifsock *cf_sk) |
57 | { | |
58 | return test_bit(RX_FLOW_ON_BIT, | |
59 | (void *) &cf_sk->flow_state); | |
60 | } | |
61 | ||
62 | static int tx_flow_is_on(struct caifsock *cf_sk) | |
63 | { | |
64 | return test_bit(TX_FLOW_ON_BIT, | |
65 | (void *) &cf_sk->flow_state); | |
66 | } | |
e6f95ec8 | 67 | |
bece7b23 | 68 | static void set_rx_flow_off(struct caifsock *cf_sk) |
e6f95ec8 | 69 | { |
bece7b23 SB |
70 | clear_bit(RX_FLOW_ON_BIT, |
71 | (void *) &cf_sk->flow_state); | |
72 | } | |
e6f95ec8 | 73 | |
bece7b23 SB |
74 | static void set_rx_flow_on(struct caifsock *cf_sk) |
75 | { | |
76 | set_bit(RX_FLOW_ON_BIT, | |
77 | (void *) &cf_sk->flow_state); | |
78 | } | |
e6f95ec8 | 79 | |
bece7b23 SB |
80 | static void set_tx_flow_off(struct caifsock *cf_sk) |
81 | { | |
82 | clear_bit(TX_FLOW_ON_BIT, | |
83 | (void *) &cf_sk->flow_state); | |
84 | } | |
e6f95ec8 | 85 | |
bece7b23 SB |
86 | static void set_tx_flow_on(struct caifsock *cf_sk) |
87 | { | |
88 | set_bit(TX_FLOW_ON_BIT, | |
89 | (void *) &cf_sk->flow_state); | |
90 | } | |
e6f95ec8 | 91 | |
bece7b23 SB |
92 | static void caif_read_lock(struct sock *sk) |
93 | { | |
94 | struct caifsock *cf_sk; | |
95 | cf_sk = container_of(sk, struct caifsock, sk); | |
96 | mutex_lock(&cf_sk->readlock); | |
97 | } | |
e6f95ec8 | 98 | |
bece7b23 SB |
99 | static void caif_read_unlock(struct sock *sk) |
100 | { | |
101 | struct caifsock *cf_sk; | |
102 | cf_sk = container_of(sk, struct caifsock, sk); | |
103 | mutex_unlock(&cf_sk->readlock); | |
104 | } | |
e6f95ec8 | 105 | |
a9a8f107 | 106 | static int sk_rcvbuf_lowwater(struct caifsock *cf_sk) |
bece7b23 SB |
107 | { |
108 | /* A quarter of full buffer is used a low water mark */ | |
109 | return cf_sk->sk.sk_rcvbuf / 4; | |
110 | } | |
e6f95ec8 | 111 | |
a9a8f107 | 112 | static void caif_flow_ctrl(struct sock *sk, int mode) |
bece7b23 SB |
113 | { |
114 | struct caifsock *cf_sk; | |
115 | cf_sk = container_of(sk, struct caifsock, sk); | |
ca6a09f2 | 116 | if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd) |
bece7b23 SB |
117 | cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode); |
118 | } | |
e6f95ec8 | 119 | |
bece7b23 SB |
120 | /* |
121 | * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are | |
122 | * not dropped, but CAIF is sending flow off instead. | |
123 | */ | |
a9a8f107 | 124 | static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
bece7b23 SB |
125 | { |
126 | int err; | |
bece7b23 SB |
127 | unsigned long flags; |
128 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
129 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 130 | |
bece7b23 | 131 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
95c96174 | 132 | (unsigned int)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) { |
e87cc472 JP |
133 | net_dbg_ratelimited("sending flow OFF (queue len = %d %d)\n", |
134 | atomic_read(&cf_sk->sk.sk_rmem_alloc), | |
135 | sk_rcvbuf_lowwater(cf_sk)); | |
bece7b23 | 136 | set_rx_flow_off(cf_sk); |
ca6a09f2 | 137 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); |
bece7b23 | 138 | } |
e6f95ec8 | 139 | |
bece7b23 SB |
140 | err = sk_filter(sk, skb); |
141 | if (err) | |
142 | return err; | |
c76562b6 | 143 | if (!sk_rmem_schedule(sk, skb, skb->truesize) && rx_flow_is_on(cf_sk)) { |
bece7b23 | 144 | set_rx_flow_off(cf_sk); |
e87cc472 | 145 | net_dbg_ratelimited("sending flow OFF due to rmem_schedule\n"); |
ca6a09f2 | 146 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); |
bece7b23 SB |
147 | } |
148 | skb->dev = NULL; | |
149 | skb_set_owner_r(skb, sk); | |
150 | /* Cache the SKB length before we tack it onto the receive | |
151 | * queue. Once it is added it no longer belongs to us and | |
152 | * may be freed by other threads of control pulling packets | |
153 | * from the queue. | |
154 | */ | |
bece7b23 SB |
155 | spin_lock_irqsave(&list->lock, flags); |
156 | if (!sock_flag(sk, SOCK_DEAD)) | |
157 | __skb_queue_tail(list, skb); | |
158 | spin_unlock_irqrestore(&list->lock, flags); | |
159 | ||
160 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 161 | sk->sk_data_ready(sk); |
bece7b23 SB |
162 | else |
163 | kfree_skb(skb); | |
e6f95ec8 SB |
164 | return 0; |
165 | } | |
166 | ||
bece7b23 SB |
167 | /* Packet Receive Callback function called from CAIF Stack */ |
168 | static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt) | |
e6f95ec8 SB |
169 | { |
170 | struct caifsock *cf_sk; | |
bece7b23 | 171 | struct sk_buff *skb; |
e6f95ec8 SB |
172 | |
173 | cf_sk = container_of(layr, struct caifsock, layer); | |
bece7b23 SB |
174 | skb = cfpkt_tonative(pkt); |
175 | ||
176 | if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) { | |
3f874adc | 177 | kfree_skb(skb); |
bece7b23 SB |
178 | return 0; |
179 | } | |
180 | caif_queue_rcv_skb(&cf_sk->sk, skb); | |
181 | return 0; | |
182 | } | |
e6f95ec8 | 183 | |
b3ccfbe4 | 184 | static void cfsk_hold(struct cflayer *layr) |
185 | { | |
186 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
187 | sock_hold(&cf_sk->sk); | |
188 | } | |
189 | ||
190 | static void cfsk_put(struct cflayer *layr) | |
191 | { | |
192 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
193 | sock_put(&cf_sk->sk); | |
194 | } | |
195 | ||
bece7b23 SB |
196 | /* Packet Control Callback function called from CAIF */ |
197 | static void caif_ctrl_cb(struct cflayer *layr, | |
3bffc475 SMP |
198 | enum caif_ctrlcmd flow, |
199 | int phyid) | |
bece7b23 SB |
200 | { |
201 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
e6f95ec8 SB |
202 | switch (flow) { |
203 | case CAIF_CTRLCMD_FLOW_ON_IND: | |
bece7b23 | 204 | /* OK from modem to start sending again */ |
bece7b23 SB |
205 | set_tx_flow_on(cf_sk); |
206 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
207 | break; |
208 | ||
209 | case CAIF_CTRLCMD_FLOW_OFF_IND: | |
bece7b23 | 210 | /* Modem asks us to shut up */ |
bece7b23 SB |
211 | set_tx_flow_off(cf_sk); |
212 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
213 | break; |
214 | ||
215 | case CAIF_CTRLCMD_INIT_RSP: | |
bece7b23 | 216 | /* We're now connected */ |
b3ccfbe4 | 217 | caif_client_register_refcnt(&cf_sk->layer, |
218 | cfsk_hold, cfsk_put); | |
bece7b23 SB |
219 | cf_sk->sk.sk_state = CAIF_CONNECTED; |
220 | set_tx_flow_on(cf_sk); | |
eaa8c5f3 | 221 | cf_sk->sk.sk_shutdown = 0; |
bece7b23 | 222 | cf_sk->sk.sk_state_change(&cf_sk->sk); |
e6f95ec8 SB |
223 | break; |
224 | ||
225 | case CAIF_CTRLCMD_DEINIT_RSP: | |
bece7b23 SB |
226 | /* We're now disconnected */ |
227 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
228 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
229 | break; |
230 | ||
231 | case CAIF_CTRLCMD_INIT_FAIL_RSP: | |
bece7b23 | 232 | /* Connect request failed */ |
bece7b23 SB |
233 | cf_sk->sk.sk_err = ECONNREFUSED; |
234 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
235 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; | |
236 | /* | |
237 | * Socket "standards" seems to require POLLOUT to | |
238 | * be set at connect failure. | |
239 | */ | |
240 | set_tx_flow_on(cf_sk); | |
241 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
242 | break; |
243 | ||
244 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: | |
bece7b23 | 245 | /* Modem has closed this connection, or device is down. */ |
bece7b23 SB |
246 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; |
247 | cf_sk->sk.sk_err = ECONNRESET; | |
248 | set_rx_flow_on(cf_sk); | |
249 | cf_sk->sk.sk_error_report(&cf_sk->sk); | |
e6f95ec8 SB |
250 | break; |
251 | ||
252 | default: | |
b31fa5ba | 253 | pr_debug("Unexpected flow command %d\n", flow); |
e6f95ec8 SB |
254 | } |
255 | } | |
256 | ||
bece7b23 | 257 | static void caif_check_flow_release(struct sock *sk) |
e6f95ec8 | 258 | { |
bece7b23 | 259 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 260 | |
bece7b23 SB |
261 | if (rx_flow_is_on(cf_sk)) |
262 | return; | |
e6f95ec8 | 263 | |
bece7b23 | 264 | if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) { |
bece7b23 | 265 | set_rx_flow_on(cf_sk); |
ca6a09f2 | 266 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
bece7b23 SB |
267 | } |
268 | } | |
dcda138d | 269 | |
bece7b23 | 270 | /* |
dcda138d SB |
271 | * Copied from unix_dgram_recvmsg, but removed credit checks, |
272 | * changed locking, address handling and added MSG_TRUNC. | |
bece7b23 | 273 | */ |
1b784140 YX |
274 | static int caif_seqpkt_recvmsg(struct socket *sock, struct msghdr *m, |
275 | size_t len, int flags) | |
e6f95ec8 SB |
276 | |
277 | { | |
278 | struct sock *sk = sock->sk; | |
e6f95ec8 | 279 | struct sk_buff *skb; |
dcda138d SB |
280 | int ret; |
281 | int copylen; | |
e6f95ec8 | 282 | |
dcda138d | 283 | ret = -EOPNOTSUPP; |
3eeff778 | 284 | if (flags & MSG_OOB) |
dcda138d | 285 | goto read_error; |
e6f95ec8 | 286 | |
bece7b23 SB |
287 | skb = skb_recv_datagram(sk, flags, 0 , &ret); |
288 | if (!skb) | |
e6f95ec8 | 289 | goto read_error; |
dcda138d SB |
290 | copylen = skb->len; |
291 | if (len < copylen) { | |
292 | m->msg_flags |= MSG_TRUNC; | |
293 | copylen = len; | |
e6f95ec8 SB |
294 | } |
295 | ||
51f3d02b | 296 | ret = skb_copy_datagram_msg(skb, 0, m, copylen); |
bece7b23 | 297 | if (ret) |
dcda138d | 298 | goto out_free; |
e6f95ec8 | 299 | |
dcda138d SB |
300 | ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
301 | out_free: | |
bece7b23 | 302 | skb_free_datagram(sk, skb); |
bece7b23 | 303 | caif_check_flow_release(sk); |
dcda138d | 304 | return ret; |
e6f95ec8 | 305 | |
bece7b23 SB |
306 | read_error: |
307 | return ret; | |
308 | } | |
e6f95ec8 | 309 | |
e6f95ec8 | 310 | |
bece7b23 SB |
311 | /* Copied from unix_stream_wait_data, identical except for lock call. */ |
312 | static long caif_stream_data_wait(struct sock *sk, long timeo) | |
313 | { | |
314 | DEFINE_WAIT(wait); | |
315 | lock_sock(sk); | |
316 | ||
317 | for (;;) { | |
318 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
319 | ||
320 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
321 | sk->sk_err || | |
322 | sk->sk_state != CAIF_CONNECTED || | |
323 | sock_flag(sk, SOCK_DEAD) || | |
324 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
325 | signal_pending(current) || | |
326 | !timeo) | |
327 | break; | |
e6f95ec8 | 328 | |
bece7b23 SB |
329 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
330 | release_sock(sk); | |
331 | timeo = schedule_timeout(timeo); | |
332 | lock_sock(sk); | |
b48732e4 MS |
333 | |
334 | if (sock_flag(sk, SOCK_DEAD)) | |
335 | break; | |
336 | ||
bece7b23 | 337 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
e6f95ec8 SB |
338 | } |
339 | ||
bece7b23 SB |
340 | finish_wait(sk_sleep(sk), &wait); |
341 | release_sock(sk); | |
342 | return timeo; | |
343 | } | |
e6f95ec8 SB |
344 | |
345 | ||
bece7b23 SB |
346 | /* |
347 | * Copied from unix_stream_recvmsg, but removed credit checks, | |
348 | * changed locking calls, changed address handling. | |
349 | */ | |
1b784140 YX |
350 | static int caif_stream_recvmsg(struct socket *sock, struct msghdr *msg, |
351 | size_t size, int flags) | |
bece7b23 SB |
352 | { |
353 | struct sock *sk = sock->sk; | |
354 | int copied = 0; | |
355 | int target; | |
356 | int err = 0; | |
357 | long timeo; | |
e6f95ec8 | 358 | |
bece7b23 SB |
359 | err = -EOPNOTSUPP; |
360 | if (flags&MSG_OOB) | |
361 | goto out; | |
e6f95ec8 | 362 | |
bece7b23 SB |
363 | /* |
364 | * Lock the socket to prevent queue disordering | |
365 | * while sleeps in memcpy_tomsg | |
366 | */ | |
367 | err = -EAGAIN; | |
368 | if (sk->sk_state == CAIF_CONNECTING) | |
369 | goto out; | |
e6f95ec8 | 370 | |
bece7b23 SB |
371 | caif_read_lock(sk); |
372 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
373 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
e6f95ec8 | 374 | |
bece7b23 SB |
375 | do { |
376 | int chunk; | |
377 | struct sk_buff *skb; | |
e6f95ec8 | 378 | |
bece7b23 | 379 | lock_sock(sk); |
b48732e4 MS |
380 | if (sock_flag(sk, SOCK_DEAD)) { |
381 | err = -ECONNRESET; | |
382 | goto unlock; | |
383 | } | |
bece7b23 SB |
384 | skb = skb_dequeue(&sk->sk_receive_queue); |
385 | caif_check_flow_release(sk); | |
e6f95ec8 | 386 | |
bece7b23 SB |
387 | if (skb == NULL) { |
388 | if (copied >= target) | |
389 | goto unlock; | |
390 | /* | |
391 | * POSIX 1003.1g mandates this order. | |
392 | */ | |
393 | err = sock_error(sk); | |
394 | if (err) | |
395 | goto unlock; | |
396 | err = -ECONNRESET; | |
397 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
398 | goto unlock; | |
e6f95ec8 | 399 | |
bece7b23 SB |
400 | err = -EPIPE; |
401 | if (sk->sk_state != CAIF_CONNECTED) | |
402 | goto unlock; | |
403 | if (sock_flag(sk, SOCK_DEAD)) | |
404 | goto unlock; | |
e6f95ec8 | 405 | |
bece7b23 | 406 | release_sock(sk); |
e6f95ec8 | 407 | |
bece7b23 SB |
408 | err = -EAGAIN; |
409 | if (!timeo) | |
410 | break; | |
e6f95ec8 | 411 | |
bece7b23 | 412 | caif_read_unlock(sk); |
e6f95ec8 | 413 | |
bece7b23 | 414 | timeo = caif_stream_data_wait(sk, timeo); |
e6f95ec8 | 415 | |
bece7b23 SB |
416 | if (signal_pending(current)) { |
417 | err = sock_intr_errno(timeo); | |
418 | goto out; | |
419 | } | |
420 | caif_read_lock(sk); | |
421 | continue; | |
422 | unlock: | |
423 | release_sock(sk); | |
424 | break; | |
e6f95ec8 | 425 | } |
bece7b23 SB |
426 | release_sock(sk); |
427 | chunk = min_t(unsigned int, skb->len, size); | |
7eab8d9e | 428 | if (memcpy_to_msg(msg, skb->data, chunk)) { |
bece7b23 SB |
429 | skb_queue_head(&sk->sk_receive_queue, skb); |
430 | if (copied == 0) | |
431 | copied = -EFAULT; | |
432 | break; | |
433 | } | |
434 | copied += chunk; | |
435 | size -= chunk; | |
e6f95ec8 | 436 | |
bece7b23 SB |
437 | /* Mark read part of skb as used */ |
438 | if (!(flags & MSG_PEEK)) { | |
439 | skb_pull(skb, chunk); | |
e6f95ec8 | 440 | |
bece7b23 SB |
441 | /* put the skb back if we didn't use it up. */ |
442 | if (skb->len) { | |
443 | skb_queue_head(&sk->sk_receive_queue, skb); | |
444 | break; | |
445 | } | |
446 | kfree_skb(skb); | |
e6f95ec8 | 447 | |
e6f95ec8 | 448 | } else { |
bece7b23 SB |
449 | /* |
450 | * It is questionable, see note in unix_dgram_recvmsg. | |
451 | */ | |
452 | /* put message back and return */ | |
453 | skb_queue_head(&sk->sk_receive_queue, skb); | |
454 | break; | |
e6f95ec8 | 455 | } |
bece7b23 SB |
456 | } while (size); |
457 | caif_read_unlock(sk); | |
e6f95ec8 | 458 | |
bece7b23 SB |
459 | out: |
460 | return copied ? : err; | |
461 | } | |
e6f95ec8 | 462 | |
bece7b23 SB |
463 | /* |
464 | * Copied from sock.c:sock_wait_for_wmem, but change to wait for | |
465 | * CAIF flow-on and sock_writable. | |
466 | */ | |
467 | static long caif_wait_for_flow_on(struct caifsock *cf_sk, | |
3bffc475 | 468 | int wait_writeable, long timeo, int *err) |
bece7b23 SB |
469 | { |
470 | struct sock *sk = &cf_sk->sk; | |
471 | DEFINE_WAIT(wait); | |
472 | for (;;) { | |
473 | *err = 0; | |
474 | if (tx_flow_is_on(cf_sk) && | |
475 | (!wait_writeable || sock_writeable(&cf_sk->sk))) | |
476 | break; | |
477 | *err = -ETIMEDOUT; | |
478 | if (!timeo) | |
479 | break; | |
480 | *err = -ERESTARTSYS; | |
481 | if (signal_pending(current)) | |
482 | break; | |
483 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
484 | *err = -ECONNRESET; | |
485 | if (sk->sk_shutdown & SHUTDOWN_MASK) | |
486 | break; | |
487 | *err = -sk->sk_err; | |
488 | if (sk->sk_err) | |
489 | break; | |
490 | *err = -EPIPE; | |
491 | if (cf_sk->sk.sk_state != CAIF_CONNECTED) | |
492 | break; | |
493 | timeo = schedule_timeout(timeo); | |
e6f95ec8 | 494 | } |
bece7b23 SB |
495 | finish_wait(sk_sleep(sk), &wait); |
496 | return timeo; | |
497 | } | |
e6f95ec8 | 498 | |
bece7b23 SB |
499 | /* |
500 | * Transmit a SKB. The device may temporarily request re-transmission | |
501 | * by returning EAGAIN. | |
502 | */ | |
503 | static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, | |
504 | int noblock, long timeo) | |
505 | { | |
506 | struct cfpkt *pkt; | |
e6f95ec8 | 507 | |
bece7b23 | 508 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
3f874adc | 509 | memset(skb->cb, 0, sizeof(struct caif_payload_info)); |
44764812 | 510 | cfpkt_set_prio(pkt, cf_sk->sk.sk_priority); |
e6f95ec8 | 511 | |
ba760574 DT |
512 | if (cf_sk->layer.dn == NULL) { |
513 | kfree_skb(skb); | |
4dd820c0 | 514 | return -EINVAL; |
ba760574 | 515 | } |
e6f95ec8 | 516 | |
4dd820c0 | 517 | return cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); |
bece7b23 | 518 | } |
e6f95ec8 | 519 | |
bece7b23 | 520 | /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ |
1b784140 YX |
521 | static int caif_seqpkt_sendmsg(struct socket *sock, struct msghdr *msg, |
522 | size_t len) | |
bece7b23 SB |
523 | { |
524 | struct sock *sk = sock->sk; | |
525 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
526 | int buffer_size; | |
527 | int ret = 0; | |
528 | struct sk_buff *skb = NULL; | |
529 | int noblock; | |
530 | long timeo; | |
531 | caif_assert(cf_sk); | |
532 | ret = sock_error(sk); | |
533 | if (ret) | |
534 | goto err; | |
535 | ||
536 | ret = -EOPNOTSUPP; | |
537 | if (msg->msg_flags&MSG_OOB) | |
538 | goto err; | |
539 | ||
540 | ret = -EOPNOTSUPP; | |
541 | if (msg->msg_namelen) | |
542 | goto err; | |
543 | ||
544 | ret = -EINVAL; | |
c0371da6 | 545 | if (unlikely(msg->msg_iter.iov->iov_base == NULL)) |
bece7b23 SB |
546 | goto err; |
547 | noblock = msg->msg_flags & MSG_DONTWAIT; | |
548 | ||
bece7b23 SB |
549 | timeo = sock_sndtimeo(sk, noblock); |
550 | timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), | |
551 | 1, timeo, &ret); | |
552 | ||
2aa40aef SB |
553 | if (ret) |
554 | goto err; | |
bece7b23 SB |
555 | ret = -EPIPE; |
556 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
557 | sock_flag(sk, SOCK_DEAD) || | |
558 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
559 | goto err; | |
560 | ||
2aa40aef SB |
561 | /* Error if trying to write more than maximum frame size. */ |
562 | ret = -EMSGSIZE; | |
563 | if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM) | |
564 | goto err; | |
565 | ||
566 | buffer_size = len + cf_sk->headroom + cf_sk->tailroom; | |
567 | ||
bece7b23 SB |
568 | ret = -ENOMEM; |
569 | skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); | |
2aa40aef SB |
570 | |
571 | if (!skb || skb_tailroom(skb) < buffer_size) | |
bece7b23 | 572 | goto err; |
2aa40aef SB |
573 | |
574 | skb_reserve(skb, cf_sk->headroom); | |
bece7b23 | 575 | |
6ce8e9ce | 576 | ret = memcpy_from_msg(skb_put(skb, len), msg, len); |
bece7b23 SB |
577 | |
578 | if (ret) | |
579 | goto err; | |
580 | ret = transmit_skb(skb, cf_sk, noblock, timeo); | |
581 | if (ret < 0) | |
c85c2951 | 582 | /* skb is already freed */ |
583 | return ret; | |
584 | ||
bece7b23 SB |
585 | return len; |
586 | err: | |
587 | kfree_skb(skb); | |
588 | return ret; | |
589 | } | |
e6f95ec8 | 590 | |
bece7b23 SB |
591 | /* |
592 | * Copied from unix_stream_sendmsg and adapted to CAIF: | |
593 | * Changed removed permission handling and added waiting for flow on | |
594 | * and other minor adaptations. | |
595 | */ | |
1b784140 YX |
596 | static int caif_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
597 | size_t len) | |
bece7b23 SB |
598 | { |
599 | struct sock *sk = sock->sk; | |
600 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
601 | int err, size; | |
602 | struct sk_buff *skb; | |
603 | int sent = 0; | |
604 | long timeo; | |
e6f95ec8 | 605 | |
bece7b23 | 606 | err = -EOPNOTSUPP; |
bece7b23 SB |
607 | if (unlikely(msg->msg_flags&MSG_OOB)) |
608 | goto out_err; | |
e6f95ec8 | 609 | |
bece7b23 SB |
610 | if (unlikely(msg->msg_namelen)) |
611 | goto out_err; | |
e6f95ec8 | 612 | |
bece7b23 SB |
613 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
614 | timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err); | |
e6f95ec8 | 615 | |
bece7b23 SB |
616 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) |
617 | goto pipe_err; | |
e6f95ec8 | 618 | |
bece7b23 | 619 | while (sent < len) { |
e6f95ec8 | 620 | |
bece7b23 | 621 | size = len-sent; |
e6f95ec8 | 622 | |
2aa40aef SB |
623 | if (size > cf_sk->maxframe) |
624 | size = cf_sk->maxframe; | |
e6f95ec8 | 625 | |
bece7b23 SB |
626 | /* If size is more than half of sndbuf, chop up message */ |
627 | if (size > ((sk->sk_sndbuf >> 1) - 64)) | |
628 | size = (sk->sk_sndbuf >> 1) - 64; | |
e6f95ec8 | 629 | |
bece7b23 SB |
630 | if (size > SKB_MAX_ALLOC) |
631 | size = SKB_MAX_ALLOC; | |
e6f95ec8 | 632 | |
bece7b23 | 633 | skb = sock_alloc_send_skb(sk, |
2aa40aef SB |
634 | size + cf_sk->headroom + |
635 | cf_sk->tailroom, | |
bece7b23 SB |
636 | msg->msg_flags&MSG_DONTWAIT, |
637 | &err); | |
638 | if (skb == NULL) | |
639 | goto out_err; | |
e6f95ec8 | 640 | |
2aa40aef | 641 | skb_reserve(skb, cf_sk->headroom); |
bece7b23 SB |
642 | /* |
643 | * If you pass two values to the sock_alloc_send_skb | |
644 | * it tries to grab the large buffer with GFP_NOFS | |
645 | * (which can fail easily), and if it fails grab the | |
646 | * fallback size buffer which is under a page and will | |
647 | * succeed. [Alan] | |
648 | */ | |
649 | size = min_t(int, size, skb_tailroom(skb)); | |
e6f95ec8 | 650 | |
6ce8e9ce | 651 | err = memcpy_from_msg(skb_put(skb, size), msg, size); |
bece7b23 SB |
652 | if (err) { |
653 | kfree_skb(skb); | |
654 | goto out_err; | |
655 | } | |
656 | err = transmit_skb(skb, cf_sk, | |
657 | msg->msg_flags&MSG_DONTWAIT, timeo); | |
ba760574 DT |
658 | if (err < 0) |
659 | /* skb is already freed */ | |
bece7b23 | 660 | goto pipe_err; |
ba760574 | 661 | |
bece7b23 | 662 | sent += size; |
e6f95ec8 | 663 | } |
e6f95ec8 | 664 | |
bece7b23 | 665 | return sent; |
e6f95ec8 | 666 | |
bece7b23 SB |
667 | pipe_err: |
668 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
669 | send_sig(SIGPIPE, current, 0); | |
670 | err = -EPIPE; | |
671 | out_err: | |
672 | return sent ? : err; | |
e6f95ec8 SB |
673 | } |
674 | ||
675 | static int setsockopt(struct socket *sock, | |
3bffc475 | 676 | int lvl, int opt, char __user *ov, unsigned int ol) |
e6f95ec8 SB |
677 | { |
678 | struct sock *sk = sock->sk; | |
679 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
f2527ec4 | 680 | int linksel; |
e6f95ec8 | 681 | |
bece7b23 | 682 | if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED) |
e6f95ec8 | 683 | return -ENOPROTOOPT; |
bece7b23 | 684 | |
e6f95ec8 SB |
685 | switch (opt) { |
686 | case CAIFSO_LINK_SELECT: | |
bece7b23 | 687 | if (ol < sizeof(int)) |
e6f95ec8 | 688 | return -EINVAL; |
e6f95ec8 SB |
689 | if (lvl != SOL_CAIF) |
690 | goto bad_sol; | |
691 | if (copy_from_user(&linksel, ov, sizeof(int))) | |
692 | return -EINVAL; | |
693 | lock_sock(&(cf_sk->sk)); | |
694 | cf_sk->conn_req.link_selector = linksel; | |
695 | release_sock(&cf_sk->sk); | |
696 | return 0; | |
697 | ||
e6f95ec8 SB |
698 | case CAIFSO_REQ_PARAM: |
699 | if (lvl != SOL_CAIF) | |
700 | goto bad_sol; | |
701 | if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL) | |
702 | return -ENOPROTOOPT; | |
e6f95ec8 | 703 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
704 | if (ol > sizeof(cf_sk->conn_req.param.data) || |
705 | copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) { | |
e6f95ec8 | 706 | release_sock(&cf_sk->sk); |
e6f95ec8 SB |
707 | return -EINVAL; |
708 | } | |
91b5c98c | 709 | cf_sk->conn_req.param.size = ol; |
e6f95ec8 SB |
710 | release_sock(&cf_sk->sk); |
711 | return 0; | |
712 | ||
713 | default: | |
bece7b23 | 714 | return -ENOPROTOOPT; |
e6f95ec8 SB |
715 | } |
716 | ||
717 | return 0; | |
718 | bad_sol: | |
e6f95ec8 SB |
719 | return -ENOPROTOOPT; |
720 | ||
721 | } | |
722 | ||
bece7b23 SB |
723 | /* |
724 | * caif_connect() - Connect a CAIF Socket | |
725 | * Copied and modified af_irda.c:irda_connect(). | |
726 | * | |
727 | * Note : by consulting "errno", the user space caller may learn the cause | |
728 | * of the failure. Most of them are visible in the function, others may come | |
729 | * from subroutines called and are listed here : | |
730 | * o -EAFNOSUPPORT: bad socket family or type. | |
731 | * o -ESOCKTNOSUPPORT: bad socket type or protocol | |
732 | * o -EINVAL: bad socket address, or CAIF link type | |
733 | * o -ECONNREFUSED: remote end refused the connection. | |
734 | * o -EINPROGRESS: connect request sent but timed out (or non-blocking) | |
735 | * o -EISCONN: already connected. | |
736 | * o -ETIMEDOUT: Connection timed out (send timeout) | |
737 | * o -ENODEV: No link layer to send request | |
738 | * o -ECONNRESET: Received Shutdown indication or lost link layer | |
739 | * o -ENOMEM: Out of memory | |
740 | * | |
741 | * State Strategy: | |
742 | * o sk_state: holds the CAIF_* protocol state, it's updated by | |
743 | * caif_ctrl_cb. | |
744 | * o sock->state: holds the SS_* socket state and is updated by connect and | |
745 | * disconnect. | |
746 | */ | |
747 | static int caif_connect(struct socket *sock, struct sockaddr *uaddr, | |
748 | int addr_len, int flags) | |
e6f95ec8 | 749 | { |
e6f95ec8 | 750 | struct sock *sk = sock->sk; |
bece7b23 SB |
751 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
752 | long timeo; | |
753 | int err; | |
2aa40aef | 754 | int ifindex, headroom, tailroom; |
79315068 | 755 | unsigned int mtu; |
2aa40aef SB |
756 | struct net_device *dev; |
757 | ||
bece7b23 | 758 | lock_sock(sk); |
e6f95ec8 | 759 | |
bece7b23 SB |
760 | err = -EAFNOSUPPORT; |
761 | if (uaddr->sa_family != AF_CAIF) | |
e6f95ec8 SB |
762 | goto out; |
763 | ||
bece7b23 SB |
764 | switch (sock->state) { |
765 | case SS_UNCONNECTED: | |
766 | /* Normal case, a fresh connect */ | |
767 | caif_assert(sk->sk_state == CAIF_DISCONNECTED); | |
768 | break; | |
769 | case SS_CONNECTING: | |
770 | switch (sk->sk_state) { | |
771 | case CAIF_CONNECTED: | |
772 | sock->state = SS_CONNECTED; | |
773 | err = -EISCONN; | |
774 | goto out; | |
775 | case CAIF_DISCONNECTED: | |
776 | /* Reconnect allowed */ | |
777 | break; | |
778 | case CAIF_CONNECTING: | |
779 | err = -EALREADY; | |
780 | if (flags & O_NONBLOCK) | |
781 | goto out; | |
782 | goto wait_connect; | |
783 | } | |
784 | break; | |
785 | case SS_CONNECTED: | |
786 | caif_assert(sk->sk_state == CAIF_CONNECTED || | |
787 | sk->sk_state == CAIF_DISCONNECTED); | |
788 | if (sk->sk_shutdown & SHUTDOWN_MASK) { | |
789 | /* Allow re-connect after SHUTDOWN_IND */ | |
bee925db | 790 | caif_disconnect_client(sock_net(sk), &cf_sk->layer); |
54e90fb5 | 791 | caif_free_client(&cf_sk->layer); |
bece7b23 SB |
792 | break; |
793 | } | |
794 | /* No reconnect on a seqpacket socket */ | |
795 | err = -EISCONN; | |
796 | goto out; | |
797 | case SS_DISCONNECTING: | |
798 | case SS_FREE: | |
799 | caif_assert(1); /*Should never happen */ | |
800 | break; | |
e6f95ec8 | 801 | } |
bece7b23 SB |
802 | sk->sk_state = CAIF_DISCONNECTED; |
803 | sock->state = SS_UNCONNECTED; | |
804 | sk_stream_kill_queues(&cf_sk->sk); | |
e6f95ec8 | 805 | |
bece7b23 | 806 | err = -EINVAL; |
f5d72af9 | 807 | if (addr_len != sizeof(struct sockaddr_caif)) |
bece7b23 | 808 | goto out; |
e6f95ec8 | 809 | |
bece7b23 | 810 | memcpy(&cf_sk->conn_req.sockaddr, uaddr, |
e6f95ec8 SB |
811 | sizeof(struct sockaddr_caif)); |
812 | ||
bece7b23 SB |
813 | /* Move to connecting socket, start sending Connect Requests */ |
814 | sock->state = SS_CONNECTING; | |
815 | sk->sk_state = CAIF_CONNECTING; | |
816 | ||
33b2f559 | 817 | /* Check priority value comming from socket */ |
f2527ec4 ACM |
818 | /* if priority value is out of range it will be ajusted */ |
819 | if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX) | |
820 | cf_sk->conn_req.priority = CAIF_PRIO_MAX; | |
821 | else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN) | |
822 | cf_sk->conn_req.priority = CAIF_PRIO_MIN; | |
823 | else | |
824 | cf_sk->conn_req.priority = cf_sk->sk.sk_priority; | |
825 | ||
826 | /*ifindex = id of the interface.*/ | |
827 | cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if; | |
828 | ||
bece7b23 | 829 | cf_sk->layer.receive = caif_sktrecv_cb; |
b3ccfbe4 | 830 | |
bee925db | 831 | err = caif_connect_client(sock_net(sk), &cf_sk->conn_req, |
2aa40aef | 832 | &cf_sk->layer, &ifindex, &headroom, &tailroom); |
b3ccfbe4 | 833 | |
bece7b23 SB |
834 | if (err < 0) { |
835 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
836 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
837 | goto out; | |
e6f95ec8 | 838 | } |
79315068 ED |
839 | |
840 | err = -ENODEV; | |
841 | rcu_read_lock(); | |
842 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); | |
843 | if (!dev) { | |
844 | rcu_read_unlock(); | |
845 | goto out; | |
846 | } | |
2aa40aef | 847 | cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom); |
79315068 ED |
848 | mtu = dev->mtu; |
849 | rcu_read_unlock(); | |
850 | ||
2aa40aef | 851 | cf_sk->tailroom = tailroom; |
79315068 | 852 | cf_sk->maxframe = mtu - (headroom + tailroom); |
2aa40aef | 853 | if (cf_sk->maxframe < 1) { |
b31fa5ba | 854 | pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu); |
f2527ec4 | 855 | err = -ENODEV; |
2aa40aef SB |
856 | goto out; |
857 | } | |
e6f95ec8 | 858 | |
bece7b23 SB |
859 | err = -EINPROGRESS; |
860 | wait_connect: | |
e6f95ec8 | 861 | |
bece7b23 SB |
862 | if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK)) |
863 | goto out; | |
e6f95ec8 | 864 | |
bece7b23 SB |
865 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
866 | ||
867 | release_sock(sk); | |
9e4b816b SB |
868 | err = -ERESTARTSYS; |
869 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), | |
bece7b23 SB |
870 | sk->sk_state != CAIF_CONNECTING, |
871 | timeo); | |
872 | lock_sock(sk); | |
9e4b816b | 873 | if (timeo < 0) |
bece7b23 | 874 | goto out; /* -ERESTARTSYS */ |
e6f95ec8 | 875 | |
9e4b816b SB |
876 | err = -ETIMEDOUT; |
877 | if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) | |
878 | goto out; | |
bece7b23 SB |
879 | if (sk->sk_state != CAIF_CONNECTED) { |
880 | sock->state = SS_UNCONNECTED; | |
881 | err = sock_error(sk); | |
882 | if (!err) | |
883 | err = -ECONNREFUSED; | |
884 | goto out; | |
885 | } | |
886 | sock->state = SS_CONNECTED; | |
887 | err = 0; | |
e6f95ec8 | 888 | out: |
bece7b23 SB |
889 | release_sock(sk); |
890 | return err; | |
e6f95ec8 SB |
891 | } |
892 | ||
bece7b23 SB |
893 | /* |
894 | * caif_release() - Disconnect a CAIF Socket | |
895 | * Copied and modified af_irda.c:irda_release(). | |
896 | */ | |
897 | static int caif_release(struct socket *sock) | |
e6f95ec8 | 898 | { |
e6f95ec8 | 899 | struct sock *sk = sock->sk; |
bece7b23 | 900 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 901 | |
bece7b23 SB |
902 | if (!sk) |
903 | return 0; | |
e6f95ec8 | 904 | |
bece7b23 | 905 | set_tx_flow_off(cf_sk); |
e6f95ec8 SB |
906 | |
907 | /* | |
bece7b23 SB |
908 | * Ensure that packets are not queued after this point in time. |
909 | * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock, | |
910 | * this ensures no packets when sock is dead. | |
e6f95ec8 | 911 | */ |
c85c2951 | 912 | spin_lock_bh(&sk->sk_receive_queue.lock); |
bece7b23 | 913 | sock_set_flag(sk, SOCK_DEAD); |
c85c2951 | 914 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
bece7b23 | 915 | sock->sk = NULL; |
e6f95ec8 | 916 | |
33b2f559 | 917 | WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir)); |
fb0d164c | 918 | debugfs_remove_recursive(cf_sk->debugfs_socket_dir); |
e6f95ec8 | 919 | |
e6f95ec8 | 920 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
921 | sk->sk_state = CAIF_DISCONNECTED; |
922 | sk->sk_shutdown = SHUTDOWN_MASK; | |
e6f95ec8 | 923 | |
54e90fb5 | 924 | caif_disconnect_client(sock_net(sk), &cf_sk->layer); |
bece7b23 SB |
925 | cf_sk->sk.sk_socket->state = SS_DISCONNECTING; |
926 | wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP); | |
e6f95ec8 | 927 | |
bece7b23 | 928 | sock_orphan(sk); |
bece7b23 SB |
929 | sk_stream_kill_queues(&cf_sk->sk); |
930 | release_sock(sk); | |
931 | sock_put(sk); | |
54e90fb5 | 932 | return 0; |
bece7b23 | 933 | } |
e6f95ec8 | 934 | |
bece7b23 SB |
935 | /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */ |
936 | static unsigned int caif_poll(struct file *file, | |
3bffc475 | 937 | struct socket *sock, poll_table *wait) |
bece7b23 SB |
938 | { |
939 | struct sock *sk = sock->sk; | |
940 | unsigned int mask; | |
941 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 942 | |
bece7b23 SB |
943 | sock_poll_wait(file, sk_sleep(sk), wait); |
944 | mask = 0; | |
e6f95ec8 | 945 | |
bece7b23 SB |
946 | /* exceptional events? */ |
947 | if (sk->sk_err) | |
948 | mask |= POLLERR; | |
949 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
950 | mask |= POLLHUP; | |
951 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
952 | mask |= POLLRDHUP; | |
e6f95ec8 | 953 | |
bece7b23 SB |
954 | /* readable? */ |
955 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
956 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
957 | mask |= POLLIN | POLLRDNORM; | |
e6f95ec8 | 958 | |
e6f95ec8 | 959 | /* |
bece7b23 SB |
960 | * we set writable also when the other side has shut down the |
961 | * connection. This prevents stuck sockets. | |
e6f95ec8 | 962 | */ |
bece7b23 SB |
963 | if (sock_writeable(sk) && tx_flow_is_on(cf_sk)) |
964 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
965 | ||
966 | return mask; | |
e6f95ec8 SB |
967 | } |
968 | ||
bece7b23 SB |
969 | static const struct proto_ops caif_seqpacket_ops = { |
970 | .family = PF_CAIF, | |
971 | .owner = THIS_MODULE, | |
972 | .release = caif_release, | |
973 | .bind = sock_no_bind, | |
974 | .connect = caif_connect, | |
975 | .socketpair = sock_no_socketpair, | |
976 | .accept = sock_no_accept, | |
977 | .getname = sock_no_getname, | |
978 | .poll = caif_poll, | |
979 | .ioctl = sock_no_ioctl, | |
980 | .listen = sock_no_listen, | |
981 | .shutdown = sock_no_shutdown, | |
982 | .setsockopt = setsockopt, | |
983 | .getsockopt = sock_no_getsockopt, | |
984 | .sendmsg = caif_seqpkt_sendmsg, | |
985 | .recvmsg = caif_seqpkt_recvmsg, | |
986 | .mmap = sock_no_mmap, | |
987 | .sendpage = sock_no_sendpage, | |
988 | }; | |
989 | ||
990 | static const struct proto_ops caif_stream_ops = { | |
e6f95ec8 SB |
991 | .family = PF_CAIF, |
992 | .owner = THIS_MODULE, | |
993 | .release = caif_release, | |
994 | .bind = sock_no_bind, | |
995 | .connect = caif_connect, | |
996 | .socketpair = sock_no_socketpair, | |
997 | .accept = sock_no_accept, | |
998 | .getname = sock_no_getname, | |
999 | .poll = caif_poll, | |
1000 | .ioctl = sock_no_ioctl, | |
1001 | .listen = sock_no_listen, | |
bece7b23 | 1002 | .shutdown = sock_no_shutdown, |
e6f95ec8 SB |
1003 | .setsockopt = setsockopt, |
1004 | .getsockopt = sock_no_getsockopt, | |
bece7b23 SB |
1005 | .sendmsg = caif_stream_sendmsg, |
1006 | .recvmsg = caif_stream_recvmsg, | |
e6f95ec8 | 1007 | .mmap = sock_no_mmap, |
bece7b23 | 1008 | .sendpage = sock_no_sendpage, |
e6f95ec8 SB |
1009 | }; |
1010 | ||
1011 | /* This function is called when a socket is finally destroyed. */ | |
1012 | static void caif_sock_destructor(struct sock *sk) | |
1013 | { | |
bece7b23 | 1014 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 SB |
1015 | caif_assert(!atomic_read(&sk->sk_wmem_alloc)); |
1016 | caif_assert(sk_unhashed(sk)); | |
1017 | caif_assert(!sk->sk_socket); | |
1018 | if (!sock_flag(sk, SOCK_DEAD)) { | |
33b2f559 | 1019 | pr_debug("Attempt to release alive CAIF socket: %p\n", sk); |
e6f95ec8 SB |
1020 | return; |
1021 | } | |
bece7b23 | 1022 | sk_stream_kill_queues(&cf_sk->sk); |
b3ccfbe4 | 1023 | caif_free_client(&cf_sk->layer); |
e6f95ec8 SB |
1024 | } |
1025 | ||
1026 | static int caif_create(struct net *net, struct socket *sock, int protocol, | |
3bffc475 | 1027 | int kern) |
e6f95ec8 SB |
1028 | { |
1029 | struct sock *sk = NULL; | |
1030 | struct caifsock *cf_sk = NULL; | |
e6f95ec8 SB |
1031 | static struct proto prot = {.name = "PF_CAIF", |
1032 | .owner = THIS_MODULE, | |
1033 | .obj_size = sizeof(struct caifsock), | |
1034 | }; | |
1035 | ||
bece7b23 SB |
1036 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) |
1037 | return -EPERM; | |
e6f95ec8 SB |
1038 | /* |
1039 | * The sock->type specifies the socket type to use. | |
bece7b23 SB |
1040 | * The CAIF socket is a packet stream in the sense |
1041 | * that it is packet based. CAIF trusts the reliability | |
1042 | * of the link, no resending is implemented. | |
e6f95ec8 | 1043 | */ |
bece7b23 SB |
1044 | if (sock->type == SOCK_SEQPACKET) |
1045 | sock->ops = &caif_seqpacket_ops; | |
1046 | else if (sock->type == SOCK_STREAM) | |
1047 | sock->ops = &caif_stream_ops; | |
1048 | else | |
e6f95ec8 SB |
1049 | return -ESOCKTNOSUPPORT; |
1050 | ||
e6f95ec8 SB |
1051 | if (protocol < 0 || protocol >= CAIFPROTO_MAX) |
1052 | return -EPROTONOSUPPORT; | |
1053 | /* | |
bece7b23 SB |
1054 | * Set the socket state to unconnected. The socket state |
1055 | * is really not used at all in the net/core or socket.c but the | |
e6f95ec8 SB |
1056 | * initialization makes sure that sock->state is not uninitialized. |
1057 | */ | |
e6f95ec8 SB |
1058 | sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot); |
1059 | if (!sk) | |
1060 | return -ENOMEM; | |
1061 | ||
1062 | cf_sk = container_of(sk, struct caifsock, sk); | |
1063 | ||
1064 | /* Store the protocol */ | |
1065 | sk->sk_protocol = (unsigned char) protocol; | |
1066 | ||
44764812 DT |
1067 | /* Initialize default priority for well-known cases */ |
1068 | switch (protocol) { | |
1069 | case CAIFPROTO_AT: | |
1070 | sk->sk_priority = TC_PRIO_CONTROL; | |
1071 | break; | |
1072 | case CAIFPROTO_RFM: | |
1073 | sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
1074 | break; | |
1075 | default: | |
1076 | sk->sk_priority = TC_PRIO_BESTEFFORT; | |
1077 | } | |
1078 | ||
e6f95ec8 SB |
1079 | /* |
1080 | * Lock in order to try to stop someone from opening the socket | |
1081 | * too early. | |
1082 | */ | |
1083 | lock_sock(&(cf_sk->sk)); | |
1084 | ||
1085 | /* Initialize the nozero default sock structure data. */ | |
1086 | sock_init_data(sock, sk); | |
e6f95ec8 | 1087 | sk->sk_destruct = caif_sock_destructor; |
e6f95ec8 | 1088 | |
bece7b23 SB |
1089 | mutex_init(&cf_sk->readlock); /* single task reading lock */ |
1090 | cf_sk->layer.ctrlcmd = caif_ctrl_cb; | |
1091 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
1092 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
e6f95ec8 | 1093 | |
bece7b23 SB |
1094 | set_tx_flow_off(cf_sk); |
1095 | set_rx_flow_on(cf_sk); | |
e6f95ec8 SB |
1096 | |
1097 | /* Set default options on configuration */ | |
bece7b23 | 1098 | cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY; |
e6f95ec8 | 1099 | cf_sk->conn_req.protocol = protocol; |
e6f95ec8 SB |
1100 | release_sock(&cf_sk->sk); |
1101 | return 0; | |
e6f95ec8 SB |
1102 | } |
1103 | ||
bece7b23 | 1104 | |
e6f95ec8 SB |
1105 | static struct net_proto_family caif_family_ops = { |
1106 | .family = PF_CAIF, | |
1107 | .create = caif_create, | |
1108 | .owner = THIS_MODULE, | |
1109 | }; | |
1110 | ||
4a695823 | 1111 | static int __init caif_sktinit_module(void) |
e6f95ec8 | 1112 | { |
bece7b23 | 1113 | int err = sock_register(&caif_family_ops); |
e6f95ec8 SB |
1114 | if (!err) |
1115 | return err; | |
e6f95ec8 SB |
1116 | return 0; |
1117 | } | |
1118 | ||
e6f95ec8 SB |
1119 | static void __exit caif_sktexit_module(void) |
1120 | { | |
1121 | sock_unregister(PF_CAIF); | |
e6f95ec8 | 1122 | } |
e6f95ec8 SB |
1123 | module_init(caif_sktinit_module); |
1124 | module_exit(caif_sktexit_module); |