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