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> |
bece7b23 SB |
22 | #include <asm/atomic.h> |
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 | static struct dentry *debugfsdir; |
e6f95ec8 SB |
47 | |
48 | #ifdef CONFIG_DEBUG_FS | |
49 | struct debug_fs_counter { | |
bece7b23 | 50 | atomic_t caif_nr_socks; |
33b2f559 | 51 | atomic_t caif_sock_create; |
bece7b23 SB |
52 | atomic_t num_connect_req; |
53 | atomic_t num_connect_resp; | |
54 | atomic_t num_connect_fail_resp; | |
55 | atomic_t num_disconnect; | |
e6f95ec8 SB |
56 | atomic_t num_remote_shutdown_ind; |
57 | atomic_t num_tx_flow_off_ind; | |
58 | atomic_t num_tx_flow_on_ind; | |
59 | atomic_t num_rx_flow_off; | |
60 | atomic_t num_rx_flow_on; | |
e6f95ec8 | 61 | }; |
a9a8f107 | 62 | static struct debug_fs_counter cnt; |
33b2f559 | 63 | #define dbfs_atomic_inc(v) atomic_inc_return(v) |
64 | #define dbfs_atomic_dec(v) atomic_dec_return(v) | |
e6f95ec8 | 65 | #else |
33b2f559 | 66 | #define dbfs_atomic_inc(v) 0 |
67 | #define dbfs_atomic_dec(v) 0 | |
e6f95ec8 SB |
68 | #endif |
69 | ||
e6f95ec8 | 70 | struct caifsock { |
bece7b23 | 71 | struct sock sk; /* must be first member */ |
e6f95ec8 | 72 | struct cflayer layer; |
bece7b23 | 73 | char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */ |
e6f95ec8 | 74 | u32 flow_state; |
e6f95ec8 | 75 | struct caif_connect_request conn_req; |
bece7b23 | 76 | struct mutex readlock; |
e6f95ec8 | 77 | struct dentry *debugfs_socket_dir; |
2aa40aef | 78 | int headroom, tailroom, maxframe; |
e6f95ec8 SB |
79 | }; |
80 | ||
bece7b23 SB |
81 | static int rx_flow_is_on(struct caifsock *cf_sk) |
82 | { | |
83 | return test_bit(RX_FLOW_ON_BIT, | |
84 | (void *) &cf_sk->flow_state); | |
85 | } | |
86 | ||
87 | static int tx_flow_is_on(struct caifsock *cf_sk) | |
88 | { | |
89 | return test_bit(TX_FLOW_ON_BIT, | |
90 | (void *) &cf_sk->flow_state); | |
91 | } | |
e6f95ec8 | 92 | |
bece7b23 | 93 | static void set_rx_flow_off(struct caifsock *cf_sk) |
e6f95ec8 | 94 | { |
bece7b23 SB |
95 | clear_bit(RX_FLOW_ON_BIT, |
96 | (void *) &cf_sk->flow_state); | |
97 | } | |
e6f95ec8 | 98 | |
bece7b23 SB |
99 | static void set_rx_flow_on(struct caifsock *cf_sk) |
100 | { | |
101 | set_bit(RX_FLOW_ON_BIT, | |
102 | (void *) &cf_sk->flow_state); | |
103 | } | |
e6f95ec8 | 104 | |
bece7b23 SB |
105 | static void set_tx_flow_off(struct caifsock *cf_sk) |
106 | { | |
107 | clear_bit(TX_FLOW_ON_BIT, | |
108 | (void *) &cf_sk->flow_state); | |
109 | } | |
e6f95ec8 | 110 | |
bece7b23 SB |
111 | static void set_tx_flow_on(struct caifsock *cf_sk) |
112 | { | |
113 | set_bit(TX_FLOW_ON_BIT, | |
114 | (void *) &cf_sk->flow_state); | |
115 | } | |
e6f95ec8 | 116 | |
bece7b23 SB |
117 | static void caif_read_lock(struct sock *sk) |
118 | { | |
119 | struct caifsock *cf_sk; | |
120 | cf_sk = container_of(sk, struct caifsock, sk); | |
121 | mutex_lock(&cf_sk->readlock); | |
122 | } | |
e6f95ec8 | 123 | |
bece7b23 SB |
124 | static void caif_read_unlock(struct sock *sk) |
125 | { | |
126 | struct caifsock *cf_sk; | |
127 | cf_sk = container_of(sk, struct caifsock, sk); | |
128 | mutex_unlock(&cf_sk->readlock); | |
129 | } | |
e6f95ec8 | 130 | |
a9a8f107 | 131 | static int sk_rcvbuf_lowwater(struct caifsock *cf_sk) |
bece7b23 SB |
132 | { |
133 | /* A quarter of full buffer is used a low water mark */ | |
134 | return cf_sk->sk.sk_rcvbuf / 4; | |
135 | } | |
e6f95ec8 | 136 | |
a9a8f107 | 137 | static void caif_flow_ctrl(struct sock *sk, int mode) |
bece7b23 SB |
138 | { |
139 | struct caifsock *cf_sk; | |
140 | cf_sk = container_of(sk, struct caifsock, sk); | |
ca6a09f2 | 141 | if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd) |
bece7b23 SB |
142 | cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode); |
143 | } | |
e6f95ec8 | 144 | |
bece7b23 SB |
145 | /* |
146 | * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are | |
147 | * not dropped, but CAIF is sending flow off instead. | |
148 | */ | |
a9a8f107 | 149 | static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
bece7b23 SB |
150 | { |
151 | int err; | |
152 | int skb_len; | |
153 | unsigned long flags; | |
154 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
155 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 156 | |
bece7b23 SB |
157 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
158 | (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) { | |
33b2f559 | 159 | if (net_ratelimit()) |
160 | pr_debug("sending flow OFF (queue len = %d %d)\n", | |
161 | atomic_read(&cf_sk->sk.sk_rmem_alloc), | |
162 | sk_rcvbuf_lowwater(cf_sk)); | |
bece7b23 | 163 | set_rx_flow_off(cf_sk); |
ca6a09f2 SB |
164 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
165 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 | 166 | } |
e6f95ec8 | 167 | |
bece7b23 SB |
168 | err = sk_filter(sk, skb); |
169 | if (err) | |
170 | return err; | |
171 | if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) { | |
172 | set_rx_flow_off(cf_sk); | |
33b2f559 | 173 | if (net_ratelimit()) |
174 | pr_debug("sending flow OFF due to rmem_schedule\n"); | |
ca6a09f2 SB |
175 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
176 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 SB |
177 | } |
178 | skb->dev = NULL; | |
179 | skb_set_owner_r(skb, sk); | |
180 | /* Cache the SKB length before we tack it onto the receive | |
181 | * queue. Once it is added it no longer belongs to us and | |
182 | * may be freed by other threads of control pulling packets | |
183 | * from the queue. | |
184 | */ | |
185 | skb_len = skb->len; | |
186 | spin_lock_irqsave(&list->lock, flags); | |
187 | if (!sock_flag(sk, SOCK_DEAD)) | |
188 | __skb_queue_tail(list, skb); | |
189 | spin_unlock_irqrestore(&list->lock, flags); | |
190 | ||
191 | if (!sock_flag(sk, SOCK_DEAD)) | |
192 | sk->sk_data_ready(sk, skb_len); | |
193 | else | |
194 | kfree_skb(skb); | |
e6f95ec8 SB |
195 | return 0; |
196 | } | |
197 | ||
bece7b23 SB |
198 | /* Packet Receive Callback function called from CAIF Stack */ |
199 | static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt) | |
e6f95ec8 SB |
200 | { |
201 | struct caifsock *cf_sk; | |
bece7b23 | 202 | struct sk_buff *skb; |
e6f95ec8 SB |
203 | |
204 | cf_sk = container_of(layr, struct caifsock, layer); | |
bece7b23 SB |
205 | skb = cfpkt_tonative(pkt); |
206 | ||
207 | if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) { | |
208 | cfpkt_destroy(pkt); | |
209 | return 0; | |
210 | } | |
211 | caif_queue_rcv_skb(&cf_sk->sk, skb); | |
212 | return 0; | |
213 | } | |
e6f95ec8 | 214 | |
b3ccfbe4 | 215 | static void cfsk_hold(struct cflayer *layr) |
216 | { | |
217 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
218 | sock_hold(&cf_sk->sk); | |
219 | } | |
220 | ||
221 | static void cfsk_put(struct cflayer *layr) | |
222 | { | |
223 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
224 | sock_put(&cf_sk->sk); | |
225 | } | |
226 | ||
bece7b23 SB |
227 | /* Packet Control Callback function called from CAIF */ |
228 | static void caif_ctrl_cb(struct cflayer *layr, | |
229 | enum caif_ctrlcmd flow, | |
230 | int phyid) | |
231 | { | |
232 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
e6f95ec8 SB |
233 | switch (flow) { |
234 | case CAIF_CTRLCMD_FLOW_ON_IND: | |
bece7b23 | 235 | /* OK from modem to start sending again */ |
e6f95ec8 | 236 | dbfs_atomic_inc(&cnt.num_tx_flow_on_ind); |
bece7b23 SB |
237 | set_tx_flow_on(cf_sk); |
238 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
239 | break; |
240 | ||
241 | case CAIF_CTRLCMD_FLOW_OFF_IND: | |
bece7b23 | 242 | /* Modem asks us to shut up */ |
e6f95ec8 | 243 | dbfs_atomic_inc(&cnt.num_tx_flow_off_ind); |
bece7b23 SB |
244 | set_tx_flow_off(cf_sk); |
245 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
246 | break; |
247 | ||
248 | case CAIF_CTRLCMD_INIT_RSP: | |
bece7b23 | 249 | /* We're now connected */ |
b3ccfbe4 | 250 | caif_client_register_refcnt(&cf_sk->layer, |
251 | cfsk_hold, cfsk_put); | |
bece7b23 SB |
252 | dbfs_atomic_inc(&cnt.num_connect_resp); |
253 | cf_sk->sk.sk_state = CAIF_CONNECTED; | |
254 | set_tx_flow_on(cf_sk); | |
255 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
256 | break; |
257 | ||
258 | case CAIF_CTRLCMD_DEINIT_RSP: | |
bece7b23 SB |
259 | /* We're now disconnected */ |
260 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
261 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
262 | break; |
263 | ||
264 | case CAIF_CTRLCMD_INIT_FAIL_RSP: | |
bece7b23 SB |
265 | /* Connect request failed */ |
266 | dbfs_atomic_inc(&cnt.num_connect_fail_resp); | |
267 | cf_sk->sk.sk_err = ECONNREFUSED; | |
268 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
269 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; | |
270 | /* | |
271 | * Socket "standards" seems to require POLLOUT to | |
272 | * be set at connect failure. | |
273 | */ | |
274 | set_tx_flow_on(cf_sk); | |
275 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
276 | break; |
277 | ||
278 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: | |
bece7b23 | 279 | /* Modem has closed this connection, or device is down. */ |
e6f95ec8 | 280 | dbfs_atomic_inc(&cnt.num_remote_shutdown_ind); |
bece7b23 SB |
281 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; |
282 | cf_sk->sk.sk_err = ECONNRESET; | |
283 | set_rx_flow_on(cf_sk); | |
284 | cf_sk->sk.sk_error_report(&cf_sk->sk); | |
e6f95ec8 SB |
285 | break; |
286 | ||
287 | default: | |
b31fa5ba | 288 | pr_debug("Unexpected flow command %d\n", flow); |
e6f95ec8 SB |
289 | } |
290 | } | |
291 | ||
bece7b23 | 292 | static void caif_check_flow_release(struct sock *sk) |
e6f95ec8 | 293 | { |
bece7b23 | 294 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 295 | |
bece7b23 SB |
296 | if (rx_flow_is_on(cf_sk)) |
297 | return; | |
e6f95ec8 | 298 | |
bece7b23 SB |
299 | if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) { |
300 | dbfs_atomic_inc(&cnt.num_rx_flow_on); | |
301 | set_rx_flow_on(cf_sk); | |
ca6a09f2 | 302 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
bece7b23 SB |
303 | } |
304 | } | |
dcda138d | 305 | |
bece7b23 | 306 | /* |
dcda138d SB |
307 | * Copied from unix_dgram_recvmsg, but removed credit checks, |
308 | * changed locking, address handling and added MSG_TRUNC. | |
bece7b23 | 309 | */ |
bece7b23 | 310 | static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock, |
dcda138d | 311 | struct msghdr *m, size_t len, int flags) |
e6f95ec8 SB |
312 | |
313 | { | |
314 | struct sock *sk = sock->sk; | |
e6f95ec8 | 315 | struct sk_buff *skb; |
dcda138d SB |
316 | int ret; |
317 | int copylen; | |
e6f95ec8 | 318 | |
dcda138d SB |
319 | ret = -EOPNOTSUPP; |
320 | if (m->msg_flags&MSG_OOB) | |
321 | goto read_error; | |
e6f95ec8 | 322 | |
bece7b23 SB |
323 | skb = skb_recv_datagram(sk, flags, 0 , &ret); |
324 | if (!skb) | |
e6f95ec8 | 325 | goto read_error; |
dcda138d SB |
326 | copylen = skb->len; |
327 | if (len < copylen) { | |
328 | m->msg_flags |= MSG_TRUNC; | |
329 | copylen = len; | |
e6f95ec8 SB |
330 | } |
331 | ||
dcda138d | 332 | ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen); |
bece7b23 | 333 | if (ret) |
dcda138d | 334 | goto out_free; |
e6f95ec8 | 335 | |
dcda138d SB |
336 | ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
337 | out_free: | |
bece7b23 | 338 | skb_free_datagram(sk, skb); |
bece7b23 | 339 | caif_check_flow_release(sk); |
dcda138d | 340 | return ret; |
e6f95ec8 | 341 | |
bece7b23 SB |
342 | read_error: |
343 | return ret; | |
344 | } | |
e6f95ec8 | 345 | |
e6f95ec8 | 346 | |
bece7b23 SB |
347 | /* Copied from unix_stream_wait_data, identical except for lock call. */ |
348 | static long caif_stream_data_wait(struct sock *sk, long timeo) | |
349 | { | |
350 | DEFINE_WAIT(wait); | |
351 | lock_sock(sk); | |
352 | ||
353 | for (;;) { | |
354 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
355 | ||
356 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
357 | sk->sk_err || | |
358 | sk->sk_state != CAIF_CONNECTED || | |
359 | sock_flag(sk, SOCK_DEAD) || | |
360 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
361 | signal_pending(current) || | |
362 | !timeo) | |
363 | break; | |
e6f95ec8 | 364 | |
bece7b23 SB |
365 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
366 | release_sock(sk); | |
367 | timeo = schedule_timeout(timeo); | |
368 | lock_sock(sk); | |
369 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
e6f95ec8 SB |
370 | } |
371 | ||
bece7b23 SB |
372 | finish_wait(sk_sleep(sk), &wait); |
373 | release_sock(sk); | |
374 | return timeo; | |
375 | } | |
e6f95ec8 SB |
376 | |
377 | ||
bece7b23 SB |
378 | /* |
379 | * Copied from unix_stream_recvmsg, but removed credit checks, | |
380 | * changed locking calls, changed address handling. | |
381 | */ | |
382 | static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
383 | struct msghdr *msg, size_t size, | |
384 | int flags) | |
385 | { | |
386 | struct sock *sk = sock->sk; | |
387 | int copied = 0; | |
388 | int target; | |
389 | int err = 0; | |
390 | long timeo; | |
e6f95ec8 | 391 | |
bece7b23 SB |
392 | err = -EOPNOTSUPP; |
393 | if (flags&MSG_OOB) | |
394 | goto out; | |
e6f95ec8 | 395 | |
bece7b23 | 396 | msg->msg_namelen = 0; |
e6f95ec8 | 397 | |
bece7b23 SB |
398 | /* |
399 | * Lock the socket to prevent queue disordering | |
400 | * while sleeps in memcpy_tomsg | |
401 | */ | |
402 | err = -EAGAIN; | |
403 | if (sk->sk_state == CAIF_CONNECTING) | |
404 | goto out; | |
e6f95ec8 | 405 | |
bece7b23 SB |
406 | caif_read_lock(sk); |
407 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
408 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
e6f95ec8 | 409 | |
bece7b23 SB |
410 | do { |
411 | int chunk; | |
412 | struct sk_buff *skb; | |
e6f95ec8 | 413 | |
bece7b23 SB |
414 | lock_sock(sk); |
415 | skb = skb_dequeue(&sk->sk_receive_queue); | |
416 | caif_check_flow_release(sk); | |
e6f95ec8 | 417 | |
bece7b23 SB |
418 | if (skb == NULL) { |
419 | if (copied >= target) | |
420 | goto unlock; | |
421 | /* | |
422 | * POSIX 1003.1g mandates this order. | |
423 | */ | |
424 | err = sock_error(sk); | |
425 | if (err) | |
426 | goto unlock; | |
427 | err = -ECONNRESET; | |
428 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
429 | goto unlock; | |
e6f95ec8 | 430 | |
bece7b23 SB |
431 | err = -EPIPE; |
432 | if (sk->sk_state != CAIF_CONNECTED) | |
433 | goto unlock; | |
434 | if (sock_flag(sk, SOCK_DEAD)) | |
435 | goto unlock; | |
e6f95ec8 | 436 | |
bece7b23 | 437 | release_sock(sk); |
e6f95ec8 | 438 | |
bece7b23 SB |
439 | err = -EAGAIN; |
440 | if (!timeo) | |
441 | break; | |
e6f95ec8 | 442 | |
bece7b23 | 443 | caif_read_unlock(sk); |
e6f95ec8 | 444 | |
bece7b23 | 445 | timeo = caif_stream_data_wait(sk, timeo); |
e6f95ec8 | 446 | |
bece7b23 SB |
447 | if (signal_pending(current)) { |
448 | err = sock_intr_errno(timeo); | |
449 | goto out; | |
450 | } | |
451 | caif_read_lock(sk); | |
452 | continue; | |
453 | unlock: | |
454 | release_sock(sk); | |
455 | break; | |
e6f95ec8 | 456 | } |
bece7b23 SB |
457 | release_sock(sk); |
458 | chunk = min_t(unsigned int, skb->len, size); | |
459 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
460 | skb_queue_head(&sk->sk_receive_queue, skb); | |
461 | if (copied == 0) | |
462 | copied = -EFAULT; | |
463 | break; | |
464 | } | |
465 | copied += chunk; | |
466 | size -= chunk; | |
e6f95ec8 | 467 | |
bece7b23 SB |
468 | /* Mark read part of skb as used */ |
469 | if (!(flags & MSG_PEEK)) { | |
470 | skb_pull(skb, chunk); | |
e6f95ec8 | 471 | |
bece7b23 SB |
472 | /* put the skb back if we didn't use it up. */ |
473 | if (skb->len) { | |
474 | skb_queue_head(&sk->sk_receive_queue, skb); | |
475 | break; | |
476 | } | |
477 | kfree_skb(skb); | |
e6f95ec8 | 478 | |
e6f95ec8 | 479 | } else { |
bece7b23 SB |
480 | /* |
481 | * It is questionable, see note in unix_dgram_recvmsg. | |
482 | */ | |
483 | /* put message back and return */ | |
484 | skb_queue_head(&sk->sk_receive_queue, skb); | |
485 | break; | |
e6f95ec8 | 486 | } |
bece7b23 SB |
487 | } while (size); |
488 | caif_read_unlock(sk); | |
e6f95ec8 | 489 | |
bece7b23 SB |
490 | out: |
491 | return copied ? : err; | |
492 | } | |
e6f95ec8 | 493 | |
bece7b23 SB |
494 | /* |
495 | * Copied from sock.c:sock_wait_for_wmem, but change to wait for | |
496 | * CAIF flow-on and sock_writable. | |
497 | */ | |
498 | static long caif_wait_for_flow_on(struct caifsock *cf_sk, | |
499 | int wait_writeable, long timeo, int *err) | |
500 | { | |
501 | struct sock *sk = &cf_sk->sk; | |
502 | DEFINE_WAIT(wait); | |
503 | for (;;) { | |
504 | *err = 0; | |
505 | if (tx_flow_is_on(cf_sk) && | |
506 | (!wait_writeable || sock_writeable(&cf_sk->sk))) | |
507 | break; | |
508 | *err = -ETIMEDOUT; | |
509 | if (!timeo) | |
510 | break; | |
511 | *err = -ERESTARTSYS; | |
512 | if (signal_pending(current)) | |
513 | break; | |
514 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
515 | *err = -ECONNRESET; | |
516 | if (sk->sk_shutdown & SHUTDOWN_MASK) | |
517 | break; | |
518 | *err = -sk->sk_err; | |
519 | if (sk->sk_err) | |
520 | break; | |
521 | *err = -EPIPE; | |
522 | if (cf_sk->sk.sk_state != CAIF_CONNECTED) | |
523 | break; | |
524 | timeo = schedule_timeout(timeo); | |
e6f95ec8 | 525 | } |
bece7b23 SB |
526 | finish_wait(sk_sleep(sk), &wait); |
527 | return timeo; | |
528 | } | |
e6f95ec8 | 529 | |
bece7b23 SB |
530 | /* |
531 | * Transmit a SKB. The device may temporarily request re-transmission | |
532 | * by returning EAGAIN. | |
533 | */ | |
534 | static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, | |
535 | int noblock, long timeo) | |
536 | { | |
537 | struct cfpkt *pkt; | |
e6f95ec8 | 538 | |
bece7b23 SB |
539 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
540 | memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); | |
e6f95ec8 | 541 | |
4dd820c0 SB |
542 | if (cf_sk->layer.dn == NULL) |
543 | return -EINVAL; | |
e6f95ec8 | 544 | |
4dd820c0 | 545 | return cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); |
bece7b23 | 546 | } |
e6f95ec8 | 547 | |
bece7b23 SB |
548 | /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ |
549 | static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
550 | struct msghdr *msg, size_t len) | |
551 | { | |
552 | struct sock *sk = sock->sk; | |
553 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
554 | int buffer_size; | |
555 | int ret = 0; | |
556 | struct sk_buff *skb = NULL; | |
557 | int noblock; | |
558 | long timeo; | |
559 | caif_assert(cf_sk); | |
560 | ret = sock_error(sk); | |
561 | if (ret) | |
562 | goto err; | |
563 | ||
564 | ret = -EOPNOTSUPP; | |
565 | if (msg->msg_flags&MSG_OOB) | |
566 | goto err; | |
567 | ||
568 | ret = -EOPNOTSUPP; | |
569 | if (msg->msg_namelen) | |
570 | goto err; | |
571 | ||
572 | ret = -EINVAL; | |
573 | if (unlikely(msg->msg_iov->iov_base == NULL)) | |
574 | goto err; | |
575 | noblock = msg->msg_flags & MSG_DONTWAIT; | |
576 | ||
bece7b23 SB |
577 | timeo = sock_sndtimeo(sk, noblock); |
578 | timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), | |
579 | 1, timeo, &ret); | |
580 | ||
2aa40aef SB |
581 | if (ret) |
582 | goto err; | |
bece7b23 SB |
583 | ret = -EPIPE; |
584 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
585 | sock_flag(sk, SOCK_DEAD) || | |
586 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
587 | goto err; | |
588 | ||
2aa40aef SB |
589 | /* Error if trying to write more than maximum frame size. */ |
590 | ret = -EMSGSIZE; | |
591 | if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM) | |
592 | goto err; | |
593 | ||
594 | buffer_size = len + cf_sk->headroom + cf_sk->tailroom; | |
595 | ||
bece7b23 SB |
596 | ret = -ENOMEM; |
597 | skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); | |
2aa40aef SB |
598 | |
599 | if (!skb || skb_tailroom(skb) < buffer_size) | |
bece7b23 | 600 | goto err; |
2aa40aef SB |
601 | |
602 | skb_reserve(skb, cf_sk->headroom); | |
bece7b23 SB |
603 | |
604 | ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
605 | ||
606 | if (ret) | |
607 | goto err; | |
608 | ret = transmit_skb(skb, cf_sk, noblock, timeo); | |
609 | if (ret < 0) | |
c85c2951 | 610 | /* skb is already freed */ |
611 | return ret; | |
612 | ||
bece7b23 SB |
613 | return len; |
614 | err: | |
615 | kfree_skb(skb); | |
616 | return ret; | |
617 | } | |
e6f95ec8 | 618 | |
bece7b23 SB |
619 | /* |
620 | * Copied from unix_stream_sendmsg and adapted to CAIF: | |
621 | * Changed removed permission handling and added waiting for flow on | |
622 | * and other minor adaptations. | |
623 | */ | |
624 | static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
625 | struct msghdr *msg, size_t len) | |
626 | { | |
627 | struct sock *sk = sock->sk; | |
628 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
629 | int err, size; | |
630 | struct sk_buff *skb; | |
631 | int sent = 0; | |
632 | long timeo; | |
e6f95ec8 | 633 | |
bece7b23 | 634 | err = -EOPNOTSUPP; |
bece7b23 SB |
635 | if (unlikely(msg->msg_flags&MSG_OOB)) |
636 | goto out_err; | |
e6f95ec8 | 637 | |
bece7b23 SB |
638 | if (unlikely(msg->msg_namelen)) |
639 | goto out_err; | |
e6f95ec8 | 640 | |
bece7b23 SB |
641 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
642 | timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err); | |
e6f95ec8 | 643 | |
bece7b23 SB |
644 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) |
645 | goto pipe_err; | |
e6f95ec8 | 646 | |
bece7b23 | 647 | while (sent < len) { |
e6f95ec8 | 648 | |
bece7b23 | 649 | size = len-sent; |
e6f95ec8 | 650 | |
2aa40aef SB |
651 | if (size > cf_sk->maxframe) |
652 | size = cf_sk->maxframe; | |
e6f95ec8 | 653 | |
bece7b23 SB |
654 | /* If size is more than half of sndbuf, chop up message */ |
655 | if (size > ((sk->sk_sndbuf >> 1) - 64)) | |
656 | size = (sk->sk_sndbuf >> 1) - 64; | |
e6f95ec8 | 657 | |
bece7b23 SB |
658 | if (size > SKB_MAX_ALLOC) |
659 | size = SKB_MAX_ALLOC; | |
e6f95ec8 | 660 | |
bece7b23 | 661 | skb = sock_alloc_send_skb(sk, |
2aa40aef SB |
662 | size + cf_sk->headroom + |
663 | cf_sk->tailroom, | |
bece7b23 SB |
664 | msg->msg_flags&MSG_DONTWAIT, |
665 | &err); | |
666 | if (skb == NULL) | |
667 | goto out_err; | |
e6f95ec8 | 668 | |
2aa40aef | 669 | skb_reserve(skb, cf_sk->headroom); |
bece7b23 SB |
670 | /* |
671 | * If you pass two values to the sock_alloc_send_skb | |
672 | * it tries to grab the large buffer with GFP_NOFS | |
673 | * (which can fail easily), and if it fails grab the | |
674 | * fallback size buffer which is under a page and will | |
675 | * succeed. [Alan] | |
676 | */ | |
677 | size = min_t(int, size, skb_tailroom(skb)); | |
e6f95ec8 | 678 | |
bece7b23 SB |
679 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
680 | if (err) { | |
681 | kfree_skb(skb); | |
682 | goto out_err; | |
683 | } | |
684 | err = transmit_skb(skb, cf_sk, | |
685 | msg->msg_flags&MSG_DONTWAIT, timeo); | |
686 | if (err < 0) { | |
687 | kfree_skb(skb); | |
688 | goto pipe_err; | |
689 | } | |
690 | sent += size; | |
e6f95ec8 | 691 | } |
e6f95ec8 | 692 | |
bece7b23 | 693 | return sent; |
e6f95ec8 | 694 | |
bece7b23 SB |
695 | pipe_err: |
696 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
697 | send_sig(SIGPIPE, current, 0); | |
698 | err = -EPIPE; | |
699 | out_err: | |
700 | return sent ? : err; | |
e6f95ec8 SB |
701 | } |
702 | ||
703 | static int setsockopt(struct socket *sock, | |
704 | int lvl, int opt, char __user *ov, unsigned int ol) | |
705 | { | |
706 | struct sock *sk = sock->sk; | |
707 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
f2527ec4 | 708 | int linksel; |
e6f95ec8 | 709 | |
bece7b23 | 710 | if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED) |
e6f95ec8 | 711 | return -ENOPROTOOPT; |
bece7b23 | 712 | |
e6f95ec8 SB |
713 | switch (opt) { |
714 | case CAIFSO_LINK_SELECT: | |
bece7b23 | 715 | if (ol < sizeof(int)) |
e6f95ec8 | 716 | return -EINVAL; |
e6f95ec8 SB |
717 | if (lvl != SOL_CAIF) |
718 | goto bad_sol; | |
719 | if (copy_from_user(&linksel, ov, sizeof(int))) | |
720 | return -EINVAL; | |
721 | lock_sock(&(cf_sk->sk)); | |
722 | cf_sk->conn_req.link_selector = linksel; | |
723 | release_sock(&cf_sk->sk); | |
724 | return 0; | |
725 | ||
e6f95ec8 SB |
726 | case CAIFSO_REQ_PARAM: |
727 | if (lvl != SOL_CAIF) | |
728 | goto bad_sol; | |
729 | if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL) | |
730 | return -ENOPROTOOPT; | |
e6f95ec8 | 731 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
732 | if (ol > sizeof(cf_sk->conn_req.param.data) || |
733 | copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) { | |
e6f95ec8 | 734 | release_sock(&cf_sk->sk); |
e6f95ec8 SB |
735 | return -EINVAL; |
736 | } | |
91b5c98c | 737 | cf_sk->conn_req.param.size = ol; |
e6f95ec8 SB |
738 | release_sock(&cf_sk->sk); |
739 | return 0; | |
740 | ||
741 | default: | |
bece7b23 | 742 | return -ENOPROTOOPT; |
e6f95ec8 SB |
743 | } |
744 | ||
745 | return 0; | |
746 | bad_sol: | |
e6f95ec8 SB |
747 | return -ENOPROTOOPT; |
748 | ||
749 | } | |
750 | ||
bece7b23 SB |
751 | /* |
752 | * caif_connect() - Connect a CAIF Socket | |
753 | * Copied and modified af_irda.c:irda_connect(). | |
754 | * | |
755 | * Note : by consulting "errno", the user space caller may learn the cause | |
756 | * of the failure. Most of them are visible in the function, others may come | |
757 | * from subroutines called and are listed here : | |
758 | * o -EAFNOSUPPORT: bad socket family or type. | |
759 | * o -ESOCKTNOSUPPORT: bad socket type or protocol | |
760 | * o -EINVAL: bad socket address, or CAIF link type | |
761 | * o -ECONNREFUSED: remote end refused the connection. | |
762 | * o -EINPROGRESS: connect request sent but timed out (or non-blocking) | |
763 | * o -EISCONN: already connected. | |
764 | * o -ETIMEDOUT: Connection timed out (send timeout) | |
765 | * o -ENODEV: No link layer to send request | |
766 | * o -ECONNRESET: Received Shutdown indication or lost link layer | |
767 | * o -ENOMEM: Out of memory | |
768 | * | |
769 | * State Strategy: | |
770 | * o sk_state: holds the CAIF_* protocol state, it's updated by | |
771 | * caif_ctrl_cb. | |
772 | * o sock->state: holds the SS_* socket state and is updated by connect and | |
773 | * disconnect. | |
774 | */ | |
775 | static int caif_connect(struct socket *sock, struct sockaddr *uaddr, | |
776 | int addr_len, int flags) | |
e6f95ec8 | 777 | { |
e6f95ec8 | 778 | struct sock *sk = sock->sk; |
bece7b23 SB |
779 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
780 | long timeo; | |
781 | int err; | |
2aa40aef | 782 | int ifindex, headroom, tailroom; |
79315068 | 783 | unsigned int mtu; |
2aa40aef SB |
784 | struct net_device *dev; |
785 | ||
bece7b23 | 786 | lock_sock(sk); |
e6f95ec8 | 787 | |
bece7b23 SB |
788 | err = -EAFNOSUPPORT; |
789 | if (uaddr->sa_family != AF_CAIF) | |
e6f95ec8 SB |
790 | goto out; |
791 | ||
bece7b23 SB |
792 | switch (sock->state) { |
793 | case SS_UNCONNECTED: | |
794 | /* Normal case, a fresh connect */ | |
795 | caif_assert(sk->sk_state == CAIF_DISCONNECTED); | |
796 | break; | |
797 | case SS_CONNECTING: | |
798 | switch (sk->sk_state) { | |
799 | case CAIF_CONNECTED: | |
800 | sock->state = SS_CONNECTED; | |
801 | err = -EISCONN; | |
802 | goto out; | |
803 | case CAIF_DISCONNECTED: | |
804 | /* Reconnect allowed */ | |
805 | break; | |
806 | case CAIF_CONNECTING: | |
807 | err = -EALREADY; | |
808 | if (flags & O_NONBLOCK) | |
809 | goto out; | |
810 | goto wait_connect; | |
811 | } | |
812 | break; | |
813 | case SS_CONNECTED: | |
814 | caif_assert(sk->sk_state == CAIF_CONNECTED || | |
815 | sk->sk_state == CAIF_DISCONNECTED); | |
816 | if (sk->sk_shutdown & SHUTDOWN_MASK) { | |
817 | /* Allow re-connect after SHUTDOWN_IND */ | |
bee925db | 818 | caif_disconnect_client(sock_net(sk), &cf_sk->layer); |
bece7b23 SB |
819 | break; |
820 | } | |
821 | /* No reconnect on a seqpacket socket */ | |
822 | err = -EISCONN; | |
823 | goto out; | |
824 | case SS_DISCONNECTING: | |
825 | case SS_FREE: | |
826 | caif_assert(1); /*Should never happen */ | |
827 | break; | |
e6f95ec8 | 828 | } |
bece7b23 SB |
829 | sk->sk_state = CAIF_DISCONNECTED; |
830 | sock->state = SS_UNCONNECTED; | |
831 | sk_stream_kill_queues(&cf_sk->sk); | |
e6f95ec8 | 832 | |
bece7b23 | 833 | err = -EINVAL; |
f5d72af9 | 834 | if (addr_len != sizeof(struct sockaddr_caif)) |
bece7b23 | 835 | goto out; |
e6f95ec8 | 836 | |
bece7b23 | 837 | memcpy(&cf_sk->conn_req.sockaddr, uaddr, |
e6f95ec8 SB |
838 | sizeof(struct sockaddr_caif)); |
839 | ||
bece7b23 SB |
840 | /* Move to connecting socket, start sending Connect Requests */ |
841 | sock->state = SS_CONNECTING; | |
842 | sk->sk_state = CAIF_CONNECTING; | |
843 | ||
33b2f559 | 844 | /* Check priority value comming from socket */ |
f2527ec4 ACM |
845 | /* if priority value is out of range it will be ajusted */ |
846 | if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX) | |
847 | cf_sk->conn_req.priority = CAIF_PRIO_MAX; | |
848 | else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN) | |
849 | cf_sk->conn_req.priority = CAIF_PRIO_MIN; | |
850 | else | |
851 | cf_sk->conn_req.priority = cf_sk->sk.sk_priority; | |
852 | ||
853 | /*ifindex = id of the interface.*/ | |
854 | cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if; | |
855 | ||
bece7b23 SB |
856 | dbfs_atomic_inc(&cnt.num_connect_req); |
857 | cf_sk->layer.receive = caif_sktrecv_cb; | |
b3ccfbe4 | 858 | |
bee925db | 859 | err = caif_connect_client(sock_net(sk), &cf_sk->conn_req, |
2aa40aef | 860 | &cf_sk->layer, &ifindex, &headroom, &tailroom); |
b3ccfbe4 | 861 | |
bece7b23 SB |
862 | if (err < 0) { |
863 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
864 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
865 | goto out; | |
e6f95ec8 | 866 | } |
79315068 ED |
867 | |
868 | err = -ENODEV; | |
869 | rcu_read_lock(); | |
870 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); | |
871 | if (!dev) { | |
872 | rcu_read_unlock(); | |
873 | goto out; | |
874 | } | |
2aa40aef | 875 | cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom); |
79315068 ED |
876 | mtu = dev->mtu; |
877 | rcu_read_unlock(); | |
878 | ||
2aa40aef | 879 | cf_sk->tailroom = tailroom; |
79315068 | 880 | cf_sk->maxframe = mtu - (headroom + tailroom); |
2aa40aef | 881 | if (cf_sk->maxframe < 1) { |
b31fa5ba | 882 | pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu); |
f2527ec4 | 883 | err = -ENODEV; |
2aa40aef SB |
884 | goto out; |
885 | } | |
e6f95ec8 | 886 | |
bece7b23 SB |
887 | err = -EINPROGRESS; |
888 | wait_connect: | |
e6f95ec8 | 889 | |
bece7b23 SB |
890 | if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK)) |
891 | goto out; | |
e6f95ec8 | 892 | |
bece7b23 SB |
893 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
894 | ||
895 | release_sock(sk); | |
9e4b816b SB |
896 | err = -ERESTARTSYS; |
897 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), | |
bece7b23 SB |
898 | sk->sk_state != CAIF_CONNECTING, |
899 | timeo); | |
900 | lock_sock(sk); | |
9e4b816b | 901 | if (timeo < 0) |
bece7b23 | 902 | goto out; /* -ERESTARTSYS */ |
e6f95ec8 | 903 | |
9e4b816b SB |
904 | err = -ETIMEDOUT; |
905 | if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) | |
906 | goto out; | |
bece7b23 SB |
907 | if (sk->sk_state != CAIF_CONNECTED) { |
908 | sock->state = SS_UNCONNECTED; | |
909 | err = sock_error(sk); | |
910 | if (!err) | |
911 | err = -ECONNREFUSED; | |
912 | goto out; | |
913 | } | |
914 | sock->state = SS_CONNECTED; | |
915 | err = 0; | |
e6f95ec8 | 916 | out: |
bece7b23 SB |
917 | release_sock(sk); |
918 | return err; | |
e6f95ec8 SB |
919 | } |
920 | ||
bece7b23 SB |
921 | /* |
922 | * caif_release() - Disconnect a CAIF Socket | |
923 | * Copied and modified af_irda.c:irda_release(). | |
924 | */ | |
925 | static int caif_release(struct socket *sock) | |
e6f95ec8 | 926 | { |
e6f95ec8 | 927 | struct sock *sk = sock->sk; |
bece7b23 SB |
928 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
929 | int res = 0; | |
e6f95ec8 | 930 | |
bece7b23 SB |
931 | if (!sk) |
932 | return 0; | |
e6f95ec8 | 933 | |
bece7b23 | 934 | set_tx_flow_off(cf_sk); |
e6f95ec8 SB |
935 | |
936 | /* | |
bece7b23 SB |
937 | * Ensure that packets are not queued after this point in time. |
938 | * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock, | |
939 | * this ensures no packets when sock is dead. | |
e6f95ec8 | 940 | */ |
c85c2951 | 941 | spin_lock_bh(&sk->sk_receive_queue.lock); |
bece7b23 | 942 | sock_set_flag(sk, SOCK_DEAD); |
c85c2951 | 943 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
bece7b23 | 944 | sock->sk = NULL; |
e6f95ec8 | 945 | |
bece7b23 | 946 | dbfs_atomic_inc(&cnt.num_disconnect); |
e6f95ec8 | 947 | |
33b2f559 | 948 | WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir)); |
e6f95ec8 SB |
949 | if (cf_sk->debugfs_socket_dir != NULL) |
950 | debugfs_remove_recursive(cf_sk->debugfs_socket_dir); | |
951 | ||
e6f95ec8 | 952 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
953 | sk->sk_state = CAIF_DISCONNECTED; |
954 | sk->sk_shutdown = SHUTDOWN_MASK; | |
e6f95ec8 | 955 | |
bece7b23 SB |
956 | if (cf_sk->sk.sk_socket->state == SS_CONNECTED || |
957 | cf_sk->sk.sk_socket->state == SS_CONNECTING) | |
bee925db | 958 | res = caif_disconnect_client(sock_net(sk), &cf_sk->layer); |
e6f95ec8 | 959 | |
bece7b23 SB |
960 | cf_sk->sk.sk_socket->state = SS_DISCONNECTING; |
961 | wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP); | |
e6f95ec8 | 962 | |
bece7b23 | 963 | sock_orphan(sk); |
bece7b23 SB |
964 | sk_stream_kill_queues(&cf_sk->sk); |
965 | release_sock(sk); | |
966 | sock_put(sk); | |
967 | return res; | |
968 | } | |
e6f95ec8 | 969 | |
bece7b23 SB |
970 | /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */ |
971 | static unsigned int caif_poll(struct file *file, | |
972 | struct socket *sock, poll_table *wait) | |
973 | { | |
974 | struct sock *sk = sock->sk; | |
975 | unsigned int mask; | |
976 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 977 | |
bece7b23 SB |
978 | sock_poll_wait(file, sk_sleep(sk), wait); |
979 | mask = 0; | |
e6f95ec8 | 980 | |
bece7b23 SB |
981 | /* exceptional events? */ |
982 | if (sk->sk_err) | |
983 | mask |= POLLERR; | |
984 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
985 | mask |= POLLHUP; | |
986 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
987 | mask |= POLLRDHUP; | |
e6f95ec8 | 988 | |
bece7b23 SB |
989 | /* readable? */ |
990 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
991 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
992 | mask |= POLLIN | POLLRDNORM; | |
e6f95ec8 | 993 | |
e6f95ec8 | 994 | /* |
bece7b23 SB |
995 | * we set writable also when the other side has shut down the |
996 | * connection. This prevents stuck sockets. | |
e6f95ec8 | 997 | */ |
bece7b23 SB |
998 | if (sock_writeable(sk) && tx_flow_is_on(cf_sk)) |
999 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1000 | ||
1001 | return mask; | |
e6f95ec8 SB |
1002 | } |
1003 | ||
bece7b23 SB |
1004 | static const struct proto_ops caif_seqpacket_ops = { |
1005 | .family = PF_CAIF, | |
1006 | .owner = THIS_MODULE, | |
1007 | .release = caif_release, | |
1008 | .bind = sock_no_bind, | |
1009 | .connect = caif_connect, | |
1010 | .socketpair = sock_no_socketpair, | |
1011 | .accept = sock_no_accept, | |
1012 | .getname = sock_no_getname, | |
1013 | .poll = caif_poll, | |
1014 | .ioctl = sock_no_ioctl, | |
1015 | .listen = sock_no_listen, | |
1016 | .shutdown = sock_no_shutdown, | |
1017 | .setsockopt = setsockopt, | |
1018 | .getsockopt = sock_no_getsockopt, | |
1019 | .sendmsg = caif_seqpkt_sendmsg, | |
1020 | .recvmsg = caif_seqpkt_recvmsg, | |
1021 | .mmap = sock_no_mmap, | |
1022 | .sendpage = sock_no_sendpage, | |
1023 | }; | |
1024 | ||
1025 | static const struct proto_ops caif_stream_ops = { | |
e6f95ec8 SB |
1026 | .family = PF_CAIF, |
1027 | .owner = THIS_MODULE, | |
1028 | .release = caif_release, | |
1029 | .bind = sock_no_bind, | |
1030 | .connect = caif_connect, | |
1031 | .socketpair = sock_no_socketpair, | |
1032 | .accept = sock_no_accept, | |
1033 | .getname = sock_no_getname, | |
1034 | .poll = caif_poll, | |
1035 | .ioctl = sock_no_ioctl, | |
1036 | .listen = sock_no_listen, | |
bece7b23 | 1037 | .shutdown = sock_no_shutdown, |
e6f95ec8 SB |
1038 | .setsockopt = setsockopt, |
1039 | .getsockopt = sock_no_getsockopt, | |
bece7b23 SB |
1040 | .sendmsg = caif_stream_sendmsg, |
1041 | .recvmsg = caif_stream_recvmsg, | |
e6f95ec8 | 1042 | .mmap = sock_no_mmap, |
bece7b23 | 1043 | .sendpage = sock_no_sendpage, |
e6f95ec8 SB |
1044 | }; |
1045 | ||
1046 | /* This function is called when a socket is finally destroyed. */ | |
1047 | static void caif_sock_destructor(struct sock *sk) | |
1048 | { | |
bece7b23 | 1049 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 SB |
1050 | caif_assert(!atomic_read(&sk->sk_wmem_alloc)); |
1051 | caif_assert(sk_unhashed(sk)); | |
1052 | caif_assert(!sk->sk_socket); | |
1053 | if (!sock_flag(sk, SOCK_DEAD)) { | |
33b2f559 | 1054 | pr_debug("Attempt to release alive CAIF socket: %p\n", sk); |
e6f95ec8 SB |
1055 | return; |
1056 | } | |
bece7b23 SB |
1057 | sk_stream_kill_queues(&cf_sk->sk); |
1058 | dbfs_atomic_dec(&cnt.caif_nr_socks); | |
b3ccfbe4 | 1059 | caif_free_client(&cf_sk->layer); |
e6f95ec8 SB |
1060 | } |
1061 | ||
1062 | static int caif_create(struct net *net, struct socket *sock, int protocol, | |
bece7b23 | 1063 | int kern) |
e6f95ec8 | 1064 | { |
33b2f559 | 1065 | int num; |
e6f95ec8 SB |
1066 | struct sock *sk = NULL; |
1067 | struct caifsock *cf_sk = NULL; | |
e6f95ec8 SB |
1068 | static struct proto prot = {.name = "PF_CAIF", |
1069 | .owner = THIS_MODULE, | |
1070 | .obj_size = sizeof(struct caifsock), | |
1071 | }; | |
1072 | ||
bece7b23 SB |
1073 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) |
1074 | return -EPERM; | |
e6f95ec8 SB |
1075 | /* |
1076 | * The sock->type specifies the socket type to use. | |
bece7b23 SB |
1077 | * The CAIF socket is a packet stream in the sense |
1078 | * that it is packet based. CAIF trusts the reliability | |
1079 | * of the link, no resending is implemented. | |
e6f95ec8 | 1080 | */ |
bece7b23 SB |
1081 | if (sock->type == SOCK_SEQPACKET) |
1082 | sock->ops = &caif_seqpacket_ops; | |
1083 | else if (sock->type == SOCK_STREAM) | |
1084 | sock->ops = &caif_stream_ops; | |
1085 | else | |
e6f95ec8 SB |
1086 | return -ESOCKTNOSUPPORT; |
1087 | ||
e6f95ec8 SB |
1088 | if (protocol < 0 || protocol >= CAIFPROTO_MAX) |
1089 | return -EPROTONOSUPPORT; | |
1090 | /* | |
bece7b23 SB |
1091 | * Set the socket state to unconnected. The socket state |
1092 | * is really not used at all in the net/core or socket.c but the | |
e6f95ec8 SB |
1093 | * initialization makes sure that sock->state is not uninitialized. |
1094 | */ | |
e6f95ec8 SB |
1095 | sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot); |
1096 | if (!sk) | |
1097 | return -ENOMEM; | |
1098 | ||
1099 | cf_sk = container_of(sk, struct caifsock, sk); | |
1100 | ||
1101 | /* Store the protocol */ | |
1102 | sk->sk_protocol = (unsigned char) protocol; | |
1103 | ||
e6f95ec8 SB |
1104 | /* |
1105 | * Lock in order to try to stop someone from opening the socket | |
1106 | * too early. | |
1107 | */ | |
1108 | lock_sock(&(cf_sk->sk)); | |
1109 | ||
1110 | /* Initialize the nozero default sock structure data. */ | |
1111 | sock_init_data(sock, sk); | |
e6f95ec8 | 1112 | sk->sk_destruct = caif_sock_destructor; |
e6f95ec8 | 1113 | |
bece7b23 SB |
1114 | mutex_init(&cf_sk->readlock); /* single task reading lock */ |
1115 | cf_sk->layer.ctrlcmd = caif_ctrl_cb; | |
1116 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
1117 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
e6f95ec8 | 1118 | |
bece7b23 SB |
1119 | set_tx_flow_off(cf_sk); |
1120 | set_rx_flow_on(cf_sk); | |
e6f95ec8 SB |
1121 | |
1122 | /* Set default options on configuration */ | |
f2527ec4 | 1123 | cf_sk->sk.sk_priority= CAIF_PRIO_NORMAL; |
bece7b23 | 1124 | cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY; |
e6f95ec8 SB |
1125 | cf_sk->conn_req.protocol = protocol; |
1126 | /* Increase the number of sockets created. */ | |
bece7b23 | 1127 | dbfs_atomic_inc(&cnt.caif_nr_socks); |
33b2f559 | 1128 | num = dbfs_atomic_inc(&cnt.caif_sock_create); |
bece7b23 | 1129 | #ifdef CONFIG_DEBUG_FS |
e6f95ec8 | 1130 | if (!IS_ERR(debugfsdir)) { |
33b2f559 | 1131 | |
bece7b23 | 1132 | /* Fill in some information concerning the misc socket. */ |
33b2f559 | 1133 | snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", num); |
bece7b23 | 1134 | |
e6f95ec8 SB |
1135 | cf_sk->debugfs_socket_dir = |
1136 | debugfs_create_dir(cf_sk->name, debugfsdir); | |
33b2f559 | 1137 | |
bece7b23 SB |
1138 | debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR, |
1139 | cf_sk->debugfs_socket_dir, | |
1140 | (u32 *) &cf_sk->sk.sk_state); | |
e6f95ec8 SB |
1141 | debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR, |
1142 | cf_sk->debugfs_socket_dir, &cf_sk->flow_state); | |
bece7b23 SB |
1143 | debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR, |
1144 | cf_sk->debugfs_socket_dir, | |
1145 | (u32 *) &cf_sk->sk.sk_rmem_alloc); | |
1146 | debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1147 | cf_sk->debugfs_socket_dir, |
bece7b23 | 1148 | (u32 *) &cf_sk->sk.sk_wmem_alloc); |
e6f95ec8 SB |
1149 | debugfs_create_u32("identity", S_IRUSR | S_IWUSR, |
1150 | cf_sk->debugfs_socket_dir, | |
1151 | (u32 *) &cf_sk->layer.id); | |
1152 | } | |
bece7b23 | 1153 | #endif |
e6f95ec8 SB |
1154 | release_sock(&cf_sk->sk); |
1155 | return 0; | |
e6f95ec8 SB |
1156 | } |
1157 | ||
bece7b23 | 1158 | |
e6f95ec8 SB |
1159 | static struct net_proto_family caif_family_ops = { |
1160 | .family = PF_CAIF, | |
1161 | .create = caif_create, | |
1162 | .owner = THIS_MODULE, | |
1163 | }; | |
1164 | ||
a9a8f107 | 1165 | static int af_caif_init(void) |
e6f95ec8 | 1166 | { |
bece7b23 | 1167 | int err = sock_register(&caif_family_ops); |
e6f95ec8 SB |
1168 | if (!err) |
1169 | return err; | |
e6f95ec8 SB |
1170 | return 0; |
1171 | } | |
1172 | ||
1173 | static int __init caif_sktinit_module(void) | |
1174 | { | |
e6f95ec8 | 1175 | #ifdef CONFIG_DEBUG_FS |
bece7b23 | 1176 | debugfsdir = debugfs_create_dir("caif_sk", NULL); |
e6f95ec8 | 1177 | if (!IS_ERR(debugfsdir)) { |
e6f95ec8 SB |
1178 | debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR, |
1179 | debugfsdir, | |
bece7b23 | 1180 | (u32 *) &cnt.caif_nr_socks); |
33b2f559 | 1181 | debugfs_create_u32("num_create", S_IRUSR | S_IWUSR, |
1182 | debugfsdir, | |
1183 | (u32 *) &cnt.caif_sock_create); | |
bece7b23 | 1184 | debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR, |
e6f95ec8 | 1185 | debugfsdir, |
bece7b23 SB |
1186 | (u32 *) &cnt.num_connect_req); |
1187 | debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1188 | debugfsdir, |
bece7b23 SB |
1189 | (u32 *) &cnt.num_connect_resp); |
1190 | debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1191 | debugfsdir, |
bece7b23 SB |
1192 | (u32 *) &cnt.num_connect_fail_resp); |
1193 | debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1194 | debugfsdir, |
bece7b23 | 1195 | (u32 *) &cnt.num_disconnect); |
e6f95ec8 SB |
1196 | debugfs_create_u32("num_remote_shutdown_ind", |
1197 | S_IRUSR | S_IWUSR, debugfsdir, | |
1198 | (u32 *) &cnt.num_remote_shutdown_ind); | |
1199 | debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR, | |
1200 | debugfsdir, | |
1201 | (u32 *) &cnt.num_tx_flow_off_ind); | |
1202 | debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR, | |
1203 | debugfsdir, | |
1204 | (u32 *) &cnt.num_tx_flow_on_ind); | |
1205 | debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR, | |
1206 | debugfsdir, | |
1207 | (u32 *) &cnt.num_rx_flow_off); | |
1208 | debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR, | |
1209 | debugfsdir, | |
1210 | (u32 *) &cnt.num_rx_flow_on); | |
1211 | } | |
1212 | #endif | |
bece7b23 | 1213 | return af_caif_init(); |
e6f95ec8 SB |
1214 | } |
1215 | ||
1216 | static void __exit caif_sktexit_module(void) | |
1217 | { | |
1218 | sock_unregister(PF_CAIF); | |
1219 | if (debugfsdir != NULL) | |
1220 | debugfs_remove_recursive(debugfsdir); | |
1221 | } | |
e6f95ec8 SB |
1222 | module_init(caif_sktinit_module); |
1223 | module_exit(caif_sktexit_module); |