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