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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> |
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 SB |
50 | atomic_t caif_nr_socks; |
51 | atomic_t num_connect_req; | |
52 | atomic_t num_connect_resp; | |
53 | atomic_t num_connect_fail_resp; | |
54 | atomic_t num_disconnect; | |
e6f95ec8 SB |
55 | atomic_t num_remote_shutdown_ind; |
56 | atomic_t num_tx_flow_off_ind; | |
57 | atomic_t num_tx_flow_on_ind; | |
58 | atomic_t num_rx_flow_off; | |
59 | atomic_t num_rx_flow_on; | |
e6f95ec8 | 60 | }; |
a9a8f107 | 61 | static struct debug_fs_counter cnt; |
e6f95ec8 SB |
62 | #define dbfs_atomic_inc(v) atomic_inc(v) |
63 | #define dbfs_atomic_dec(v) atomic_dec(v) | |
64 | #else | |
65 | #define dbfs_atomic_inc(v) | |
66 | #define dbfs_atomic_dec(v) | |
67 | #endif | |
68 | ||
e6f95ec8 | 69 | struct caifsock { |
bece7b23 | 70 | struct sock sk; /* must be first member */ |
e6f95ec8 | 71 | struct cflayer layer; |
bece7b23 | 72 | char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */ |
e6f95ec8 | 73 | u32 flow_state; |
e6f95ec8 | 74 | struct caif_connect_request conn_req; |
bece7b23 | 75 | struct mutex readlock; |
e6f95ec8 | 76 | struct dentry *debugfs_socket_dir; |
2aa40aef | 77 | int headroom, tailroom, maxframe; |
e6f95ec8 SB |
78 | }; |
79 | ||
bece7b23 SB |
80 | static int rx_flow_is_on(struct caifsock *cf_sk) |
81 | { | |
82 | return test_bit(RX_FLOW_ON_BIT, | |
83 | (void *) &cf_sk->flow_state); | |
84 | } | |
85 | ||
86 | static int tx_flow_is_on(struct caifsock *cf_sk) | |
87 | { | |
88 | return test_bit(TX_FLOW_ON_BIT, | |
89 | (void *) &cf_sk->flow_state); | |
90 | } | |
e6f95ec8 | 91 | |
bece7b23 | 92 | static void set_rx_flow_off(struct caifsock *cf_sk) |
e6f95ec8 | 93 | { |
bece7b23 SB |
94 | clear_bit(RX_FLOW_ON_BIT, |
95 | (void *) &cf_sk->flow_state); | |
96 | } | |
e6f95ec8 | 97 | |
bece7b23 SB |
98 | static void set_rx_flow_on(struct caifsock *cf_sk) |
99 | { | |
100 | set_bit(RX_FLOW_ON_BIT, | |
101 | (void *) &cf_sk->flow_state); | |
102 | } | |
e6f95ec8 | 103 | |
bece7b23 SB |
104 | static void set_tx_flow_off(struct caifsock *cf_sk) |
105 | { | |
106 | clear_bit(TX_FLOW_ON_BIT, | |
107 | (void *) &cf_sk->flow_state); | |
108 | } | |
e6f95ec8 | 109 | |
bece7b23 SB |
110 | static void set_tx_flow_on(struct caifsock *cf_sk) |
111 | { | |
112 | set_bit(TX_FLOW_ON_BIT, | |
113 | (void *) &cf_sk->flow_state); | |
114 | } | |
e6f95ec8 | 115 | |
bece7b23 SB |
116 | static void caif_read_lock(struct sock *sk) |
117 | { | |
118 | struct caifsock *cf_sk; | |
119 | cf_sk = container_of(sk, struct caifsock, sk); | |
120 | mutex_lock(&cf_sk->readlock); | |
121 | } | |
e6f95ec8 | 122 | |
bece7b23 SB |
123 | static void caif_read_unlock(struct sock *sk) |
124 | { | |
125 | struct caifsock *cf_sk; | |
126 | cf_sk = container_of(sk, struct caifsock, sk); | |
127 | mutex_unlock(&cf_sk->readlock); | |
128 | } | |
e6f95ec8 | 129 | |
a9a8f107 | 130 | static int sk_rcvbuf_lowwater(struct caifsock *cf_sk) |
bece7b23 SB |
131 | { |
132 | /* A quarter of full buffer is used a low water mark */ | |
133 | return cf_sk->sk.sk_rcvbuf / 4; | |
134 | } | |
e6f95ec8 | 135 | |
a9a8f107 | 136 | static void caif_flow_ctrl(struct sock *sk, int mode) |
bece7b23 SB |
137 | { |
138 | struct caifsock *cf_sk; | |
139 | cf_sk = container_of(sk, struct caifsock, sk); | |
ca6a09f2 | 140 | if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd) |
bece7b23 SB |
141 | cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode); |
142 | } | |
e6f95ec8 | 143 | |
bece7b23 SB |
144 | /* |
145 | * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are | |
146 | * not dropped, but CAIF is sending flow off instead. | |
147 | */ | |
a9a8f107 | 148 | static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
bece7b23 SB |
149 | { |
150 | int err; | |
151 | int skb_len; | |
152 | unsigned long flags; | |
153 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
154 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 155 | |
bece7b23 SB |
156 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
157 | (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) { | |
b04367df | 158 | pr_debug("sending flow OFF (queue len = %d %d)\n", |
bece7b23 SB |
159 | atomic_read(&cf_sk->sk.sk_rmem_alloc), |
160 | sk_rcvbuf_lowwater(cf_sk)); | |
161 | set_rx_flow_off(cf_sk); | |
ca6a09f2 SB |
162 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
163 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 | 164 | } |
e6f95ec8 | 165 | |
bece7b23 SB |
166 | err = sk_filter(sk, skb); |
167 | if (err) | |
168 | return err; | |
169 | if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) { | |
170 | set_rx_flow_off(cf_sk); | |
b04367df | 171 | pr_debug("sending flow OFF due to rmem_schedule\n"); |
ca6a09f2 SB |
172 | dbfs_atomic_inc(&cnt.num_rx_flow_off); |
173 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ); | |
bece7b23 SB |
174 | } |
175 | skb->dev = NULL; | |
176 | skb_set_owner_r(skb, sk); | |
177 | /* Cache the SKB length before we tack it onto the receive | |
178 | * queue. Once it is added it no longer belongs to us and | |
179 | * may be freed by other threads of control pulling packets | |
180 | * from the queue. | |
181 | */ | |
182 | skb_len = skb->len; | |
183 | spin_lock_irqsave(&list->lock, flags); | |
184 | if (!sock_flag(sk, SOCK_DEAD)) | |
185 | __skb_queue_tail(list, skb); | |
186 | spin_unlock_irqrestore(&list->lock, flags); | |
187 | ||
188 | if (!sock_flag(sk, SOCK_DEAD)) | |
189 | sk->sk_data_ready(sk, skb_len); | |
190 | else | |
191 | kfree_skb(skb); | |
e6f95ec8 SB |
192 | return 0; |
193 | } | |
194 | ||
bece7b23 SB |
195 | /* Packet Receive Callback function called from CAIF Stack */ |
196 | static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt) | |
e6f95ec8 SB |
197 | { |
198 | struct caifsock *cf_sk; | |
bece7b23 | 199 | struct sk_buff *skb; |
e6f95ec8 SB |
200 | |
201 | cf_sk = container_of(layr, struct caifsock, layer); | |
bece7b23 SB |
202 | skb = cfpkt_tonative(pkt); |
203 | ||
204 | if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) { | |
205 | cfpkt_destroy(pkt); | |
206 | return 0; | |
207 | } | |
208 | caif_queue_rcv_skb(&cf_sk->sk, skb); | |
209 | return 0; | |
210 | } | |
e6f95ec8 | 211 | |
bece7b23 SB |
212 | /* Packet Control Callback function called from CAIF */ |
213 | static void caif_ctrl_cb(struct cflayer *layr, | |
214 | enum caif_ctrlcmd flow, | |
215 | int phyid) | |
216 | { | |
217 | struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); | |
e6f95ec8 SB |
218 | switch (flow) { |
219 | case CAIF_CTRLCMD_FLOW_ON_IND: | |
bece7b23 | 220 | /* OK from modem to start sending again */ |
e6f95ec8 | 221 | dbfs_atomic_inc(&cnt.num_tx_flow_on_ind); |
bece7b23 SB |
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_FLOW_OFF_IND: | |
bece7b23 | 227 | /* Modem asks us to shut up */ |
e6f95ec8 | 228 | dbfs_atomic_inc(&cnt.num_tx_flow_off_ind); |
bece7b23 SB |
229 | set_tx_flow_off(cf_sk); |
230 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
231 | break; |
232 | ||
233 | case CAIF_CTRLCMD_INIT_RSP: | |
bece7b23 SB |
234 | /* We're now connected */ |
235 | dbfs_atomic_inc(&cnt.num_connect_resp); | |
236 | cf_sk->sk.sk_state = CAIF_CONNECTED; | |
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_DEINIT_RSP: | |
bece7b23 SB |
242 | /* We're now disconnected */ |
243 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
244 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
245 | cfcnfg_release_adap_layer(&cf_sk->layer); | |
e6f95ec8 SB |
246 | break; |
247 | ||
248 | case CAIF_CTRLCMD_INIT_FAIL_RSP: | |
bece7b23 SB |
249 | /* Connect request failed */ |
250 | dbfs_atomic_inc(&cnt.num_connect_fail_resp); | |
251 | cf_sk->sk.sk_err = ECONNREFUSED; | |
252 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
253 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; | |
254 | /* | |
255 | * Socket "standards" seems to require POLLOUT to | |
256 | * be set at connect failure. | |
257 | */ | |
258 | set_tx_flow_on(cf_sk); | |
259 | cf_sk->sk.sk_state_change(&cf_sk->sk); | |
e6f95ec8 SB |
260 | break; |
261 | ||
262 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: | |
bece7b23 | 263 | /* Modem has closed this connection, or device is down. */ |
e6f95ec8 | 264 | dbfs_atomic_inc(&cnt.num_remote_shutdown_ind); |
bece7b23 SB |
265 | cf_sk->sk.sk_shutdown = SHUTDOWN_MASK; |
266 | cf_sk->sk.sk_err = ECONNRESET; | |
267 | set_rx_flow_on(cf_sk); | |
268 | cf_sk->sk.sk_error_report(&cf_sk->sk); | |
e6f95ec8 SB |
269 | break; |
270 | ||
271 | default: | |
b31fa5ba | 272 | pr_debug("Unexpected flow command %d\n", flow); |
e6f95ec8 SB |
273 | } |
274 | } | |
275 | ||
bece7b23 | 276 | static void caif_check_flow_release(struct sock *sk) |
e6f95ec8 | 277 | { |
bece7b23 | 278 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 | 279 | |
bece7b23 SB |
280 | if (rx_flow_is_on(cf_sk)) |
281 | return; | |
e6f95ec8 | 282 | |
bece7b23 SB |
283 | if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) { |
284 | dbfs_atomic_inc(&cnt.num_rx_flow_on); | |
285 | set_rx_flow_on(cf_sk); | |
ca6a09f2 | 286 | caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
bece7b23 SB |
287 | } |
288 | } | |
dcda138d | 289 | |
bece7b23 | 290 | /* |
dcda138d SB |
291 | * Copied from unix_dgram_recvmsg, but removed credit checks, |
292 | * changed locking, address handling and added MSG_TRUNC. | |
bece7b23 | 293 | */ |
bece7b23 | 294 | static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock, |
dcda138d | 295 | struct msghdr *m, size_t len, int flags) |
e6f95ec8 SB |
296 | |
297 | { | |
298 | struct sock *sk = sock->sk; | |
e6f95ec8 | 299 | struct sk_buff *skb; |
dcda138d SB |
300 | int ret; |
301 | int copylen; | |
e6f95ec8 | 302 | |
dcda138d SB |
303 | ret = -EOPNOTSUPP; |
304 | if (m->msg_flags&MSG_OOB) | |
305 | goto read_error; | |
e6f95ec8 | 306 | |
bece7b23 SB |
307 | skb = skb_recv_datagram(sk, flags, 0 , &ret); |
308 | if (!skb) | |
e6f95ec8 | 309 | goto read_error; |
dcda138d SB |
310 | copylen = skb->len; |
311 | if (len < copylen) { | |
312 | m->msg_flags |= MSG_TRUNC; | |
313 | copylen = len; | |
e6f95ec8 SB |
314 | } |
315 | ||
dcda138d | 316 | ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen); |
bece7b23 | 317 | if (ret) |
dcda138d | 318 | goto out_free; |
e6f95ec8 | 319 | |
dcda138d SB |
320 | ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
321 | out_free: | |
bece7b23 | 322 | skb_free_datagram(sk, skb); |
bece7b23 | 323 | caif_check_flow_release(sk); |
dcda138d | 324 | return ret; |
e6f95ec8 | 325 | |
bece7b23 SB |
326 | read_error: |
327 | return ret; | |
328 | } | |
e6f95ec8 | 329 | |
e6f95ec8 | 330 | |
bece7b23 SB |
331 | /* Copied from unix_stream_wait_data, identical except for lock call. */ |
332 | static long caif_stream_data_wait(struct sock *sk, long timeo) | |
333 | { | |
334 | DEFINE_WAIT(wait); | |
335 | lock_sock(sk); | |
336 | ||
337 | for (;;) { | |
338 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
339 | ||
340 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
341 | sk->sk_err || | |
342 | sk->sk_state != CAIF_CONNECTED || | |
343 | sock_flag(sk, SOCK_DEAD) || | |
344 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
345 | signal_pending(current) || | |
346 | !timeo) | |
347 | break; | |
e6f95ec8 | 348 | |
bece7b23 SB |
349 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
350 | release_sock(sk); | |
351 | timeo = schedule_timeout(timeo); | |
352 | lock_sock(sk); | |
353 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
e6f95ec8 SB |
354 | } |
355 | ||
bece7b23 SB |
356 | finish_wait(sk_sleep(sk), &wait); |
357 | release_sock(sk); | |
358 | return timeo; | |
359 | } | |
e6f95ec8 SB |
360 | |
361 | ||
bece7b23 SB |
362 | /* |
363 | * Copied from unix_stream_recvmsg, but removed credit checks, | |
364 | * changed locking calls, changed address handling. | |
365 | */ | |
366 | static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
367 | struct msghdr *msg, size_t size, | |
368 | int flags) | |
369 | { | |
370 | struct sock *sk = sock->sk; | |
371 | int copied = 0; | |
372 | int target; | |
373 | int err = 0; | |
374 | long timeo; | |
e6f95ec8 | 375 | |
bece7b23 SB |
376 | err = -EOPNOTSUPP; |
377 | if (flags&MSG_OOB) | |
378 | goto out; | |
e6f95ec8 | 379 | |
bece7b23 | 380 | msg->msg_namelen = 0; |
e6f95ec8 | 381 | |
bece7b23 SB |
382 | /* |
383 | * Lock the socket to prevent queue disordering | |
384 | * while sleeps in memcpy_tomsg | |
385 | */ | |
386 | err = -EAGAIN; | |
387 | if (sk->sk_state == CAIF_CONNECTING) | |
388 | goto out; | |
e6f95ec8 | 389 | |
bece7b23 SB |
390 | caif_read_lock(sk); |
391 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
392 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
e6f95ec8 | 393 | |
bece7b23 SB |
394 | do { |
395 | int chunk; | |
396 | struct sk_buff *skb; | |
e6f95ec8 | 397 | |
bece7b23 SB |
398 | lock_sock(sk); |
399 | skb = skb_dequeue(&sk->sk_receive_queue); | |
400 | caif_check_flow_release(sk); | |
e6f95ec8 | 401 | |
bece7b23 SB |
402 | if (skb == NULL) { |
403 | if (copied >= target) | |
404 | goto unlock; | |
405 | /* | |
406 | * POSIX 1003.1g mandates this order. | |
407 | */ | |
408 | err = sock_error(sk); | |
409 | if (err) | |
410 | goto unlock; | |
411 | err = -ECONNRESET; | |
412 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
413 | goto unlock; | |
e6f95ec8 | 414 | |
bece7b23 SB |
415 | err = -EPIPE; |
416 | if (sk->sk_state != CAIF_CONNECTED) | |
417 | goto unlock; | |
418 | if (sock_flag(sk, SOCK_DEAD)) | |
419 | goto unlock; | |
e6f95ec8 | 420 | |
bece7b23 | 421 | release_sock(sk); |
e6f95ec8 | 422 | |
bece7b23 SB |
423 | err = -EAGAIN; |
424 | if (!timeo) | |
425 | break; | |
e6f95ec8 | 426 | |
bece7b23 | 427 | caif_read_unlock(sk); |
e6f95ec8 | 428 | |
bece7b23 | 429 | timeo = caif_stream_data_wait(sk, timeo); |
e6f95ec8 | 430 | |
bece7b23 SB |
431 | if (signal_pending(current)) { |
432 | err = sock_intr_errno(timeo); | |
433 | goto out; | |
434 | } | |
435 | caif_read_lock(sk); | |
436 | continue; | |
437 | unlock: | |
438 | release_sock(sk); | |
439 | break; | |
e6f95ec8 | 440 | } |
bece7b23 SB |
441 | release_sock(sk); |
442 | chunk = min_t(unsigned int, skb->len, size); | |
443 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
444 | skb_queue_head(&sk->sk_receive_queue, skb); | |
445 | if (copied == 0) | |
446 | copied = -EFAULT; | |
447 | break; | |
448 | } | |
449 | copied += chunk; | |
450 | size -= chunk; | |
e6f95ec8 | 451 | |
bece7b23 SB |
452 | /* Mark read part of skb as used */ |
453 | if (!(flags & MSG_PEEK)) { | |
454 | skb_pull(skb, chunk); | |
e6f95ec8 | 455 | |
bece7b23 SB |
456 | /* put the skb back if we didn't use it up. */ |
457 | if (skb->len) { | |
458 | skb_queue_head(&sk->sk_receive_queue, skb); | |
459 | break; | |
460 | } | |
461 | kfree_skb(skb); | |
e6f95ec8 | 462 | |
e6f95ec8 | 463 | } else { |
bece7b23 SB |
464 | /* |
465 | * It is questionable, see note in unix_dgram_recvmsg. | |
466 | */ | |
467 | /* put message back and return */ | |
468 | skb_queue_head(&sk->sk_receive_queue, skb); | |
469 | break; | |
e6f95ec8 | 470 | } |
bece7b23 SB |
471 | } while (size); |
472 | caif_read_unlock(sk); | |
e6f95ec8 | 473 | |
bece7b23 SB |
474 | out: |
475 | return copied ? : err; | |
476 | } | |
e6f95ec8 | 477 | |
bece7b23 SB |
478 | /* |
479 | * Copied from sock.c:sock_wait_for_wmem, but change to wait for | |
480 | * CAIF flow-on and sock_writable. | |
481 | */ | |
482 | static long caif_wait_for_flow_on(struct caifsock *cf_sk, | |
483 | int wait_writeable, long timeo, int *err) | |
484 | { | |
485 | struct sock *sk = &cf_sk->sk; | |
486 | DEFINE_WAIT(wait); | |
487 | for (;;) { | |
488 | *err = 0; | |
489 | if (tx_flow_is_on(cf_sk) && | |
490 | (!wait_writeable || sock_writeable(&cf_sk->sk))) | |
491 | break; | |
492 | *err = -ETIMEDOUT; | |
493 | if (!timeo) | |
494 | break; | |
495 | *err = -ERESTARTSYS; | |
496 | if (signal_pending(current)) | |
497 | break; | |
498 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
499 | *err = -ECONNRESET; | |
500 | if (sk->sk_shutdown & SHUTDOWN_MASK) | |
501 | break; | |
502 | *err = -sk->sk_err; | |
503 | if (sk->sk_err) | |
504 | break; | |
505 | *err = -EPIPE; | |
506 | if (cf_sk->sk.sk_state != CAIF_CONNECTED) | |
507 | break; | |
508 | timeo = schedule_timeout(timeo); | |
e6f95ec8 | 509 | } |
bece7b23 SB |
510 | finish_wait(sk_sleep(sk), &wait); |
511 | return timeo; | |
512 | } | |
e6f95ec8 | 513 | |
bece7b23 SB |
514 | /* |
515 | * Transmit a SKB. The device may temporarily request re-transmission | |
516 | * by returning EAGAIN. | |
517 | */ | |
518 | static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, | |
519 | int noblock, long timeo) | |
520 | { | |
521 | struct cfpkt *pkt; | |
522 | int ret, loopcnt = 0; | |
e6f95ec8 | 523 | |
bece7b23 SB |
524 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
525 | memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); | |
526 | do { | |
e6f95ec8 | 527 | |
bece7b23 | 528 | ret = -ETIMEDOUT; |
e6f95ec8 | 529 | |
bece7b23 SB |
530 | /* Slight paranoia, probably not needed. */ |
531 | if (unlikely(loopcnt++ > 1000)) { | |
b31fa5ba | 532 | pr_warn("transmit retries failed, error = %d\n", ret); |
bece7b23 | 533 | break; |
e6f95ec8 SB |
534 | } |
535 | ||
bece7b23 SB |
536 | if (cf_sk->layer.dn != NULL) |
537 | ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); | |
538 | if (likely(ret >= 0)) | |
539 | break; | |
540 | /* if transmit return -EAGAIN, then retry */ | |
541 | if (noblock && ret == -EAGAIN) | |
542 | break; | |
543 | timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret); | |
544 | if (signal_pending(current)) { | |
545 | ret = sock_intr_errno(timeo); | |
546 | break; | |
e6f95ec8 | 547 | } |
bece7b23 SB |
548 | if (ret) |
549 | break; | |
550 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
551 | sock_flag(&cf_sk->sk, SOCK_DEAD) || | |
552 | (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) { | |
553 | ret = -EPIPE; | |
554 | cf_sk->sk.sk_err = EPIPE; | |
555 | break; | |
e6f95ec8 | 556 | } |
bece7b23 SB |
557 | } while (ret == -EAGAIN); |
558 | return ret; | |
559 | } | |
e6f95ec8 | 560 | |
bece7b23 SB |
561 | /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ |
562 | static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
563 | struct msghdr *msg, size_t len) | |
564 | { | |
565 | struct sock *sk = sock->sk; | |
566 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
567 | int buffer_size; | |
568 | int ret = 0; | |
569 | struct sk_buff *skb = NULL; | |
570 | int noblock; | |
571 | long timeo; | |
572 | caif_assert(cf_sk); | |
573 | ret = sock_error(sk); | |
574 | if (ret) | |
575 | goto err; | |
576 | ||
577 | ret = -EOPNOTSUPP; | |
578 | if (msg->msg_flags&MSG_OOB) | |
579 | goto err; | |
580 | ||
581 | ret = -EOPNOTSUPP; | |
582 | if (msg->msg_namelen) | |
583 | goto err; | |
584 | ||
585 | ret = -EINVAL; | |
586 | if (unlikely(msg->msg_iov->iov_base == NULL)) | |
587 | goto err; | |
588 | noblock = msg->msg_flags & MSG_DONTWAIT; | |
589 | ||
bece7b23 SB |
590 | timeo = sock_sndtimeo(sk, noblock); |
591 | timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), | |
592 | 1, timeo, &ret); | |
593 | ||
2aa40aef SB |
594 | if (ret) |
595 | goto err; | |
bece7b23 SB |
596 | ret = -EPIPE; |
597 | if (cf_sk->sk.sk_state != CAIF_CONNECTED || | |
598 | sock_flag(sk, SOCK_DEAD) || | |
599 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
600 | goto err; | |
601 | ||
2aa40aef SB |
602 | /* Error if trying to write more than maximum frame size. */ |
603 | ret = -EMSGSIZE; | |
604 | if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM) | |
605 | goto err; | |
606 | ||
607 | buffer_size = len + cf_sk->headroom + cf_sk->tailroom; | |
608 | ||
bece7b23 SB |
609 | ret = -ENOMEM; |
610 | skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); | |
2aa40aef SB |
611 | |
612 | if (!skb || skb_tailroom(skb) < buffer_size) | |
bece7b23 | 613 | goto err; |
2aa40aef SB |
614 | |
615 | skb_reserve(skb, cf_sk->headroom); | |
bece7b23 SB |
616 | |
617 | ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
618 | ||
619 | if (ret) | |
620 | goto err; | |
621 | ret = transmit_skb(skb, cf_sk, noblock, timeo); | |
622 | if (ret < 0) | |
623 | goto err; | |
624 | return len; | |
625 | err: | |
626 | kfree_skb(skb); | |
627 | return ret; | |
628 | } | |
e6f95ec8 | 629 | |
bece7b23 SB |
630 | /* |
631 | * Copied from unix_stream_sendmsg and adapted to CAIF: | |
632 | * Changed removed permission handling and added waiting for flow on | |
633 | * and other minor adaptations. | |
634 | */ | |
635 | static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
636 | struct msghdr *msg, size_t len) | |
637 | { | |
638 | struct sock *sk = sock->sk; | |
639 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
640 | int err, size; | |
641 | struct sk_buff *skb; | |
642 | int sent = 0; | |
643 | long timeo; | |
e6f95ec8 | 644 | |
bece7b23 | 645 | err = -EOPNOTSUPP; |
bece7b23 SB |
646 | if (unlikely(msg->msg_flags&MSG_OOB)) |
647 | goto out_err; | |
e6f95ec8 | 648 | |
bece7b23 SB |
649 | if (unlikely(msg->msg_namelen)) |
650 | goto out_err; | |
e6f95ec8 | 651 | |
bece7b23 SB |
652 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
653 | timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err); | |
e6f95ec8 | 654 | |
bece7b23 SB |
655 | if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) |
656 | goto pipe_err; | |
e6f95ec8 | 657 | |
bece7b23 | 658 | while (sent < len) { |
e6f95ec8 | 659 | |
bece7b23 | 660 | size = len-sent; |
e6f95ec8 | 661 | |
2aa40aef SB |
662 | if (size > cf_sk->maxframe) |
663 | size = cf_sk->maxframe; | |
e6f95ec8 | 664 | |
bece7b23 SB |
665 | /* If size is more than half of sndbuf, chop up message */ |
666 | if (size > ((sk->sk_sndbuf >> 1) - 64)) | |
667 | size = (sk->sk_sndbuf >> 1) - 64; | |
e6f95ec8 | 668 | |
bece7b23 SB |
669 | if (size > SKB_MAX_ALLOC) |
670 | size = SKB_MAX_ALLOC; | |
e6f95ec8 | 671 | |
bece7b23 | 672 | skb = sock_alloc_send_skb(sk, |
2aa40aef SB |
673 | size + cf_sk->headroom + |
674 | cf_sk->tailroom, | |
bece7b23 SB |
675 | msg->msg_flags&MSG_DONTWAIT, |
676 | &err); | |
677 | if (skb == NULL) | |
678 | goto out_err; | |
e6f95ec8 | 679 | |
2aa40aef | 680 | skb_reserve(skb, cf_sk->headroom); |
bece7b23 SB |
681 | /* |
682 | * If you pass two values to the sock_alloc_send_skb | |
683 | * it tries to grab the large buffer with GFP_NOFS | |
684 | * (which can fail easily), and if it fails grab the | |
685 | * fallback size buffer which is under a page and will | |
686 | * succeed. [Alan] | |
687 | */ | |
688 | size = min_t(int, size, skb_tailroom(skb)); | |
e6f95ec8 | 689 | |
bece7b23 SB |
690 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
691 | if (err) { | |
692 | kfree_skb(skb); | |
693 | goto out_err; | |
694 | } | |
695 | err = transmit_skb(skb, cf_sk, | |
696 | msg->msg_flags&MSG_DONTWAIT, timeo); | |
697 | if (err < 0) { | |
698 | kfree_skb(skb); | |
699 | goto pipe_err; | |
700 | } | |
701 | sent += size; | |
e6f95ec8 | 702 | } |
e6f95ec8 | 703 | |
bece7b23 | 704 | return sent; |
e6f95ec8 | 705 | |
bece7b23 SB |
706 | pipe_err: |
707 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
708 | send_sig(SIGPIPE, current, 0); | |
709 | err = -EPIPE; | |
710 | out_err: | |
711 | return sent ? : err; | |
e6f95ec8 SB |
712 | } |
713 | ||
714 | static int setsockopt(struct socket *sock, | |
715 | int lvl, int opt, char __user *ov, unsigned int ol) | |
716 | { | |
717 | struct sock *sk = sock->sk; | |
718 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
f2527ec4 | 719 | int linksel; |
e6f95ec8 | 720 | |
bece7b23 | 721 | if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED) |
e6f95ec8 | 722 | return -ENOPROTOOPT; |
bece7b23 | 723 | |
e6f95ec8 SB |
724 | switch (opt) { |
725 | case CAIFSO_LINK_SELECT: | |
bece7b23 | 726 | if (ol < sizeof(int)) |
e6f95ec8 | 727 | return -EINVAL; |
e6f95ec8 SB |
728 | if (lvl != SOL_CAIF) |
729 | goto bad_sol; | |
730 | if (copy_from_user(&linksel, ov, sizeof(int))) | |
731 | return -EINVAL; | |
732 | lock_sock(&(cf_sk->sk)); | |
733 | cf_sk->conn_req.link_selector = linksel; | |
734 | release_sock(&cf_sk->sk); | |
735 | return 0; | |
736 | ||
e6f95ec8 SB |
737 | case CAIFSO_REQ_PARAM: |
738 | if (lvl != SOL_CAIF) | |
739 | goto bad_sol; | |
740 | if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL) | |
741 | return -ENOPROTOOPT; | |
e6f95ec8 | 742 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
743 | if (ol > sizeof(cf_sk->conn_req.param.data) || |
744 | copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) { | |
e6f95ec8 | 745 | release_sock(&cf_sk->sk); |
e6f95ec8 SB |
746 | return -EINVAL; |
747 | } | |
91b5c98c | 748 | cf_sk->conn_req.param.size = ol; |
e6f95ec8 SB |
749 | release_sock(&cf_sk->sk); |
750 | return 0; | |
751 | ||
752 | default: | |
bece7b23 | 753 | return -ENOPROTOOPT; |
e6f95ec8 SB |
754 | } |
755 | ||
756 | return 0; | |
757 | bad_sol: | |
e6f95ec8 SB |
758 | return -ENOPROTOOPT; |
759 | ||
760 | } | |
761 | ||
bece7b23 SB |
762 | /* |
763 | * caif_connect() - Connect a CAIF Socket | |
764 | * Copied and modified af_irda.c:irda_connect(). | |
765 | * | |
766 | * Note : by consulting "errno", the user space caller may learn the cause | |
767 | * of the failure. Most of them are visible in the function, others may come | |
768 | * from subroutines called and are listed here : | |
769 | * o -EAFNOSUPPORT: bad socket family or type. | |
770 | * o -ESOCKTNOSUPPORT: bad socket type or protocol | |
771 | * o -EINVAL: bad socket address, or CAIF link type | |
772 | * o -ECONNREFUSED: remote end refused the connection. | |
773 | * o -EINPROGRESS: connect request sent but timed out (or non-blocking) | |
774 | * o -EISCONN: already connected. | |
775 | * o -ETIMEDOUT: Connection timed out (send timeout) | |
776 | * o -ENODEV: No link layer to send request | |
777 | * o -ECONNRESET: Received Shutdown indication or lost link layer | |
778 | * o -ENOMEM: Out of memory | |
779 | * | |
780 | * State Strategy: | |
781 | * o sk_state: holds the CAIF_* protocol state, it's updated by | |
782 | * caif_ctrl_cb. | |
783 | * o sock->state: holds the SS_* socket state and is updated by connect and | |
784 | * disconnect. | |
785 | */ | |
786 | static int caif_connect(struct socket *sock, struct sockaddr *uaddr, | |
787 | int addr_len, int flags) | |
e6f95ec8 | 788 | { |
e6f95ec8 | 789 | struct sock *sk = sock->sk; |
bece7b23 SB |
790 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
791 | long timeo; | |
792 | int err; | |
2aa40aef | 793 | int ifindex, headroom, tailroom; |
79315068 | 794 | unsigned int mtu; |
2aa40aef SB |
795 | struct net_device *dev; |
796 | ||
bece7b23 | 797 | lock_sock(sk); |
e6f95ec8 | 798 | |
bece7b23 SB |
799 | err = -EAFNOSUPPORT; |
800 | if (uaddr->sa_family != AF_CAIF) | |
e6f95ec8 SB |
801 | goto out; |
802 | ||
bece7b23 SB |
803 | switch (sock->state) { |
804 | case SS_UNCONNECTED: | |
805 | /* Normal case, a fresh connect */ | |
806 | caif_assert(sk->sk_state == CAIF_DISCONNECTED); | |
807 | break; | |
808 | case SS_CONNECTING: | |
809 | switch (sk->sk_state) { | |
810 | case CAIF_CONNECTED: | |
811 | sock->state = SS_CONNECTED; | |
812 | err = -EISCONN; | |
813 | goto out; | |
814 | case CAIF_DISCONNECTED: | |
815 | /* Reconnect allowed */ | |
816 | break; | |
817 | case CAIF_CONNECTING: | |
818 | err = -EALREADY; | |
819 | if (flags & O_NONBLOCK) | |
820 | goto out; | |
821 | goto wait_connect; | |
822 | } | |
823 | break; | |
824 | case SS_CONNECTED: | |
825 | caif_assert(sk->sk_state == CAIF_CONNECTED || | |
826 | sk->sk_state == CAIF_DISCONNECTED); | |
827 | if (sk->sk_shutdown & SHUTDOWN_MASK) { | |
828 | /* Allow re-connect after SHUTDOWN_IND */ | |
829 | caif_disconnect_client(&cf_sk->layer); | |
830 | break; | |
831 | } | |
832 | /* No reconnect on a seqpacket socket */ | |
833 | err = -EISCONN; | |
834 | goto out; | |
835 | case SS_DISCONNECTING: | |
836 | case SS_FREE: | |
837 | caif_assert(1); /*Should never happen */ | |
838 | break; | |
e6f95ec8 | 839 | } |
bece7b23 SB |
840 | sk->sk_state = CAIF_DISCONNECTED; |
841 | sock->state = SS_UNCONNECTED; | |
842 | sk_stream_kill_queues(&cf_sk->sk); | |
e6f95ec8 | 843 | |
bece7b23 | 844 | err = -EINVAL; |
f5d72af9 | 845 | if (addr_len != sizeof(struct sockaddr_caif)) |
bece7b23 | 846 | goto out; |
e6f95ec8 | 847 | |
bece7b23 | 848 | memcpy(&cf_sk->conn_req.sockaddr, uaddr, |
e6f95ec8 SB |
849 | sizeof(struct sockaddr_caif)); |
850 | ||
bece7b23 SB |
851 | /* Move to connecting socket, start sending Connect Requests */ |
852 | sock->state = SS_CONNECTING; | |
853 | sk->sk_state = CAIF_CONNECTING; | |
854 | ||
25985edc | 855 | /* Check priority value coming from socket */ |
f2527ec4 ACM |
856 | /* if priority value is out of range it will be ajusted */ |
857 | if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX) | |
858 | cf_sk->conn_req.priority = CAIF_PRIO_MAX; | |
859 | else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN) | |
860 | cf_sk->conn_req.priority = CAIF_PRIO_MIN; | |
861 | else | |
862 | cf_sk->conn_req.priority = cf_sk->sk.sk_priority; | |
863 | ||
864 | /*ifindex = id of the interface.*/ | |
865 | cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if; | |
866 | ||
bece7b23 SB |
867 | dbfs_atomic_inc(&cnt.num_connect_req); |
868 | cf_sk->layer.receive = caif_sktrecv_cb; | |
869 | err = caif_connect_client(&cf_sk->conn_req, | |
2aa40aef | 870 | &cf_sk->layer, &ifindex, &headroom, &tailroom); |
bece7b23 SB |
871 | if (err < 0) { |
872 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
873 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
874 | goto out; | |
e6f95ec8 | 875 | } |
79315068 ED |
876 | |
877 | err = -ENODEV; | |
878 | rcu_read_lock(); | |
879 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); | |
880 | if (!dev) { | |
881 | rcu_read_unlock(); | |
882 | goto out; | |
883 | } | |
2aa40aef | 884 | cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom); |
79315068 ED |
885 | mtu = dev->mtu; |
886 | rcu_read_unlock(); | |
887 | ||
2aa40aef | 888 | cf_sk->tailroom = tailroom; |
79315068 | 889 | cf_sk->maxframe = mtu - (headroom + tailroom); |
2aa40aef | 890 | if (cf_sk->maxframe < 1) { |
b31fa5ba | 891 | pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu); |
f2527ec4 | 892 | err = -ENODEV; |
2aa40aef SB |
893 | goto out; |
894 | } | |
e6f95ec8 | 895 | |
bece7b23 SB |
896 | err = -EINPROGRESS; |
897 | wait_connect: | |
e6f95ec8 | 898 | |
bece7b23 SB |
899 | if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK)) |
900 | goto out; | |
e6f95ec8 | 901 | |
bece7b23 SB |
902 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
903 | ||
904 | release_sock(sk); | |
9e4b816b SB |
905 | err = -ERESTARTSYS; |
906 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), | |
bece7b23 SB |
907 | sk->sk_state != CAIF_CONNECTING, |
908 | timeo); | |
909 | lock_sock(sk); | |
9e4b816b | 910 | if (timeo < 0) |
bece7b23 | 911 | goto out; /* -ERESTARTSYS */ |
e6f95ec8 | 912 | |
9e4b816b SB |
913 | err = -ETIMEDOUT; |
914 | if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) | |
915 | goto out; | |
bece7b23 SB |
916 | if (sk->sk_state != CAIF_CONNECTED) { |
917 | sock->state = SS_UNCONNECTED; | |
918 | err = sock_error(sk); | |
919 | if (!err) | |
920 | err = -ECONNREFUSED; | |
921 | goto out; | |
922 | } | |
923 | sock->state = SS_CONNECTED; | |
924 | err = 0; | |
e6f95ec8 | 925 | out: |
bece7b23 SB |
926 | release_sock(sk); |
927 | return err; | |
e6f95ec8 SB |
928 | } |
929 | ||
bece7b23 SB |
930 | /* |
931 | * caif_release() - Disconnect a CAIF Socket | |
932 | * Copied and modified af_irda.c:irda_release(). | |
933 | */ | |
934 | static int caif_release(struct socket *sock) | |
e6f95ec8 | 935 | { |
e6f95ec8 | 936 | struct sock *sk = sock->sk; |
bece7b23 SB |
937 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
938 | int res = 0; | |
e6f95ec8 | 939 | |
bece7b23 SB |
940 | if (!sk) |
941 | return 0; | |
e6f95ec8 | 942 | |
bece7b23 | 943 | set_tx_flow_off(cf_sk); |
e6f95ec8 SB |
944 | |
945 | /* | |
bece7b23 SB |
946 | * Ensure that packets are not queued after this point in time. |
947 | * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock, | |
948 | * this ensures no packets when sock is dead. | |
e6f95ec8 | 949 | */ |
bece7b23 SB |
950 | spin_lock(&sk->sk_receive_queue.lock); |
951 | sock_set_flag(sk, SOCK_DEAD); | |
952 | spin_unlock(&sk->sk_receive_queue.lock); | |
953 | sock->sk = NULL; | |
e6f95ec8 | 954 | |
bece7b23 | 955 | dbfs_atomic_inc(&cnt.num_disconnect); |
e6f95ec8 SB |
956 | |
957 | if (cf_sk->debugfs_socket_dir != NULL) | |
958 | debugfs_remove_recursive(cf_sk->debugfs_socket_dir); | |
959 | ||
e6f95ec8 | 960 | lock_sock(&(cf_sk->sk)); |
bece7b23 SB |
961 | sk->sk_state = CAIF_DISCONNECTED; |
962 | sk->sk_shutdown = SHUTDOWN_MASK; | |
e6f95ec8 | 963 | |
bece7b23 SB |
964 | if (cf_sk->sk.sk_socket->state == SS_CONNECTED || |
965 | cf_sk->sk.sk_socket->state == SS_CONNECTING) | |
966 | res = caif_disconnect_client(&cf_sk->layer); | |
e6f95ec8 | 967 | |
bece7b23 SB |
968 | cf_sk->sk.sk_socket->state = SS_DISCONNECTING; |
969 | wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP); | |
e6f95ec8 | 970 | |
bece7b23 SB |
971 | sock_orphan(sk); |
972 | cf_sk->layer.dn = NULL; | |
973 | sk_stream_kill_queues(&cf_sk->sk); | |
974 | release_sock(sk); | |
975 | sock_put(sk); | |
976 | return res; | |
977 | } | |
e6f95ec8 | 978 | |
bece7b23 SB |
979 | /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */ |
980 | static unsigned int caif_poll(struct file *file, | |
981 | struct socket *sock, poll_table *wait) | |
982 | { | |
983 | struct sock *sk = sock->sk; | |
984 | unsigned int mask; | |
985 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); | |
e6f95ec8 | 986 | |
bece7b23 SB |
987 | sock_poll_wait(file, sk_sleep(sk), wait); |
988 | mask = 0; | |
e6f95ec8 | 989 | |
bece7b23 SB |
990 | /* exceptional events? */ |
991 | if (sk->sk_err) | |
992 | mask |= POLLERR; | |
993 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
994 | mask |= POLLHUP; | |
995 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
996 | mask |= POLLRDHUP; | |
e6f95ec8 | 997 | |
bece7b23 SB |
998 | /* readable? */ |
999 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1000 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1001 | mask |= POLLIN | POLLRDNORM; | |
e6f95ec8 | 1002 | |
e6f95ec8 | 1003 | /* |
bece7b23 SB |
1004 | * we set writable also when the other side has shut down the |
1005 | * connection. This prevents stuck sockets. | |
e6f95ec8 | 1006 | */ |
bece7b23 SB |
1007 | if (sock_writeable(sk) && tx_flow_is_on(cf_sk)) |
1008 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1009 | ||
1010 | return mask; | |
e6f95ec8 SB |
1011 | } |
1012 | ||
bece7b23 SB |
1013 | static const struct proto_ops caif_seqpacket_ops = { |
1014 | .family = PF_CAIF, | |
1015 | .owner = THIS_MODULE, | |
1016 | .release = caif_release, | |
1017 | .bind = sock_no_bind, | |
1018 | .connect = caif_connect, | |
1019 | .socketpair = sock_no_socketpair, | |
1020 | .accept = sock_no_accept, | |
1021 | .getname = sock_no_getname, | |
1022 | .poll = caif_poll, | |
1023 | .ioctl = sock_no_ioctl, | |
1024 | .listen = sock_no_listen, | |
1025 | .shutdown = sock_no_shutdown, | |
1026 | .setsockopt = setsockopt, | |
1027 | .getsockopt = sock_no_getsockopt, | |
1028 | .sendmsg = caif_seqpkt_sendmsg, | |
1029 | .recvmsg = caif_seqpkt_recvmsg, | |
1030 | .mmap = sock_no_mmap, | |
1031 | .sendpage = sock_no_sendpage, | |
1032 | }; | |
1033 | ||
1034 | static const struct proto_ops caif_stream_ops = { | |
e6f95ec8 SB |
1035 | .family = PF_CAIF, |
1036 | .owner = THIS_MODULE, | |
1037 | .release = caif_release, | |
1038 | .bind = sock_no_bind, | |
1039 | .connect = caif_connect, | |
1040 | .socketpair = sock_no_socketpair, | |
1041 | .accept = sock_no_accept, | |
1042 | .getname = sock_no_getname, | |
1043 | .poll = caif_poll, | |
1044 | .ioctl = sock_no_ioctl, | |
1045 | .listen = sock_no_listen, | |
bece7b23 | 1046 | .shutdown = sock_no_shutdown, |
e6f95ec8 SB |
1047 | .setsockopt = setsockopt, |
1048 | .getsockopt = sock_no_getsockopt, | |
bece7b23 SB |
1049 | .sendmsg = caif_stream_sendmsg, |
1050 | .recvmsg = caif_stream_recvmsg, | |
e6f95ec8 | 1051 | .mmap = sock_no_mmap, |
bece7b23 | 1052 | .sendpage = sock_no_sendpage, |
e6f95ec8 SB |
1053 | }; |
1054 | ||
1055 | /* This function is called when a socket is finally destroyed. */ | |
1056 | static void caif_sock_destructor(struct sock *sk) | |
1057 | { | |
bece7b23 | 1058 | struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
e6f95ec8 SB |
1059 | caif_assert(!atomic_read(&sk->sk_wmem_alloc)); |
1060 | caif_assert(sk_unhashed(sk)); | |
1061 | caif_assert(!sk->sk_socket); | |
1062 | if (!sock_flag(sk, SOCK_DEAD)) { | |
bece7b23 | 1063 | pr_info("Attempt to release alive CAIF socket: %p\n", sk); |
e6f95ec8 SB |
1064 | return; |
1065 | } | |
bece7b23 SB |
1066 | sk_stream_kill_queues(&cf_sk->sk); |
1067 | dbfs_atomic_dec(&cnt.caif_nr_socks); | |
e6f95ec8 SB |
1068 | } |
1069 | ||
1070 | static int caif_create(struct net *net, struct socket *sock, int protocol, | |
bece7b23 | 1071 | int kern) |
e6f95ec8 SB |
1072 | { |
1073 | struct sock *sk = NULL; | |
1074 | struct caifsock *cf_sk = NULL; | |
e6f95ec8 SB |
1075 | static struct proto prot = {.name = "PF_CAIF", |
1076 | .owner = THIS_MODULE, | |
1077 | .obj_size = sizeof(struct caifsock), | |
1078 | }; | |
1079 | ||
bece7b23 SB |
1080 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) |
1081 | return -EPERM; | |
e6f95ec8 SB |
1082 | /* |
1083 | * The sock->type specifies the socket type to use. | |
bece7b23 SB |
1084 | * The CAIF socket is a packet stream in the sense |
1085 | * that it is packet based. CAIF trusts the reliability | |
1086 | * of the link, no resending is implemented. | |
e6f95ec8 | 1087 | */ |
bece7b23 SB |
1088 | if (sock->type == SOCK_SEQPACKET) |
1089 | sock->ops = &caif_seqpacket_ops; | |
1090 | else if (sock->type == SOCK_STREAM) | |
1091 | sock->ops = &caif_stream_ops; | |
1092 | else | |
e6f95ec8 SB |
1093 | return -ESOCKTNOSUPPORT; |
1094 | ||
e6f95ec8 SB |
1095 | if (protocol < 0 || protocol >= CAIFPROTO_MAX) |
1096 | return -EPROTONOSUPPORT; | |
1097 | /* | |
bece7b23 SB |
1098 | * Set the socket state to unconnected. The socket state |
1099 | * is really not used at all in the net/core or socket.c but the | |
e6f95ec8 SB |
1100 | * initialization makes sure that sock->state is not uninitialized. |
1101 | */ | |
e6f95ec8 SB |
1102 | sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot); |
1103 | if (!sk) | |
1104 | return -ENOMEM; | |
1105 | ||
1106 | cf_sk = container_of(sk, struct caifsock, sk); | |
1107 | ||
1108 | /* Store the protocol */ | |
1109 | sk->sk_protocol = (unsigned char) protocol; | |
1110 | ||
e6f95ec8 SB |
1111 | /* |
1112 | * Lock in order to try to stop someone from opening the socket | |
1113 | * too early. | |
1114 | */ | |
1115 | lock_sock(&(cf_sk->sk)); | |
1116 | ||
1117 | /* Initialize the nozero default sock structure data. */ | |
1118 | sock_init_data(sock, sk); | |
e6f95ec8 | 1119 | sk->sk_destruct = caif_sock_destructor; |
e6f95ec8 | 1120 | |
bece7b23 SB |
1121 | mutex_init(&cf_sk->readlock); /* single task reading lock */ |
1122 | cf_sk->layer.ctrlcmd = caif_ctrl_cb; | |
1123 | cf_sk->sk.sk_socket->state = SS_UNCONNECTED; | |
1124 | cf_sk->sk.sk_state = CAIF_DISCONNECTED; | |
e6f95ec8 | 1125 | |
bece7b23 SB |
1126 | set_tx_flow_off(cf_sk); |
1127 | set_rx_flow_on(cf_sk); | |
e6f95ec8 SB |
1128 | |
1129 | /* Set default options on configuration */ | |
f2527ec4 | 1130 | cf_sk->sk.sk_priority= CAIF_PRIO_NORMAL; |
bece7b23 | 1131 | cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY; |
e6f95ec8 SB |
1132 | cf_sk->conn_req.protocol = protocol; |
1133 | /* Increase the number of sockets created. */ | |
bece7b23 SB |
1134 | dbfs_atomic_inc(&cnt.caif_nr_socks); |
1135 | #ifdef CONFIG_DEBUG_FS | |
e6f95ec8 | 1136 | if (!IS_ERR(debugfsdir)) { |
bece7b23 SB |
1137 | /* Fill in some information concerning the misc socket. */ |
1138 | snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", | |
1139 | atomic_read(&cnt.caif_nr_socks)); | |
1140 | ||
e6f95ec8 SB |
1141 | cf_sk->debugfs_socket_dir = |
1142 | debugfs_create_dir(cf_sk->name, debugfsdir); | |
bece7b23 SB |
1143 | debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR, |
1144 | cf_sk->debugfs_socket_dir, | |
1145 | (u32 *) &cf_sk->sk.sk_state); | |
e6f95ec8 SB |
1146 | debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR, |
1147 | cf_sk->debugfs_socket_dir, &cf_sk->flow_state); | |
bece7b23 SB |
1148 | debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR, |
1149 | cf_sk->debugfs_socket_dir, | |
1150 | (u32 *) &cf_sk->sk.sk_rmem_alloc); | |
1151 | debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1152 | cf_sk->debugfs_socket_dir, |
bece7b23 | 1153 | (u32 *) &cf_sk->sk.sk_wmem_alloc); |
e6f95ec8 SB |
1154 | debugfs_create_u32("identity", S_IRUSR | S_IWUSR, |
1155 | cf_sk->debugfs_socket_dir, | |
1156 | (u32 *) &cf_sk->layer.id); | |
1157 | } | |
bece7b23 | 1158 | #endif |
e6f95ec8 SB |
1159 | release_sock(&cf_sk->sk); |
1160 | return 0; | |
e6f95ec8 SB |
1161 | } |
1162 | ||
bece7b23 | 1163 | |
e6f95ec8 SB |
1164 | static struct net_proto_family caif_family_ops = { |
1165 | .family = PF_CAIF, | |
1166 | .create = caif_create, | |
1167 | .owner = THIS_MODULE, | |
1168 | }; | |
1169 | ||
a9a8f107 | 1170 | static int af_caif_init(void) |
e6f95ec8 | 1171 | { |
bece7b23 | 1172 | int err = sock_register(&caif_family_ops); |
e6f95ec8 SB |
1173 | if (!err) |
1174 | return err; | |
e6f95ec8 SB |
1175 | return 0; |
1176 | } | |
1177 | ||
1178 | static int __init caif_sktinit_module(void) | |
1179 | { | |
e6f95ec8 | 1180 | #ifdef CONFIG_DEBUG_FS |
bece7b23 | 1181 | debugfsdir = debugfs_create_dir("caif_sk", NULL); |
e6f95ec8 | 1182 | if (!IS_ERR(debugfsdir)) { |
e6f95ec8 SB |
1183 | debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR, |
1184 | debugfsdir, | |
bece7b23 SB |
1185 | (u32 *) &cnt.caif_nr_socks); |
1186 | debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1187 | debugfsdir, |
bece7b23 SB |
1188 | (u32 *) &cnt.num_connect_req); |
1189 | debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1190 | debugfsdir, |
bece7b23 SB |
1191 | (u32 *) &cnt.num_connect_resp); |
1192 | debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1193 | debugfsdir, |
bece7b23 SB |
1194 | (u32 *) &cnt.num_connect_fail_resp); |
1195 | debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR, | |
e6f95ec8 | 1196 | debugfsdir, |
bece7b23 | 1197 | (u32 *) &cnt.num_disconnect); |
e6f95ec8 SB |
1198 | debugfs_create_u32("num_remote_shutdown_ind", |
1199 | S_IRUSR | S_IWUSR, debugfsdir, | |
1200 | (u32 *) &cnt.num_remote_shutdown_ind); | |
1201 | debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR, | |
1202 | debugfsdir, | |
1203 | (u32 *) &cnt.num_tx_flow_off_ind); | |
1204 | debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR, | |
1205 | debugfsdir, | |
1206 | (u32 *) &cnt.num_tx_flow_on_ind); | |
1207 | debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR, | |
1208 | debugfsdir, | |
1209 | (u32 *) &cnt.num_rx_flow_off); | |
1210 | debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR, | |
1211 | debugfsdir, | |
1212 | (u32 *) &cnt.num_rx_flow_on); | |
1213 | } | |
1214 | #endif | |
bece7b23 | 1215 | return af_caif_init(); |
e6f95ec8 SB |
1216 | } |
1217 | ||
1218 | static void __exit caif_sktexit_module(void) | |
1219 | { | |
1220 | sock_unregister(PF_CAIF); | |
1221 | if (debugfsdir != NULL) | |
1222 | debugfs_remove_recursive(debugfsdir); | |
1223 | } | |
e6f95ec8 SB |
1224 | module_init(caif_sktinit_module); |
1225 | module_exit(caif_sktexit_module); |