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drivers: autoconvert trivial BKL users to private mutex
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / caif / caif_socket.c
blob8ce9047861166740a17a2448cb1d4f668fba1d21
1 /*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7 #include <linux/fs.h>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/sched.h>
11 #include <linux/spinlock.h>
12 #include <linux/mutex.h>
13 #include <linux/list.h>
14 #include <linux/wait.h>
15 #include <linux/poll.h>
16 #include <linux/tcp.h>
17 #include <linux/uaccess.h>
18 #include <linux/mutex.h>
19 #include <linux/debugfs.h>
20 #include <linux/caif/caif_socket.h>
21 #include <asm/atomic.h>
22 #include <net/sock.h>
23 #include <net/tcp_states.h>
24 #include <net/caif/caif_layer.h>
25 #include <net/caif/caif_dev.h>
26 #include <net/caif/cfpkt.h>
27
28 MODULE_LICENSE("GPL");
29 MODULE_ALIAS_NETPROTO(AF_CAIF);
30
31 #define CAIF_DEF_SNDBUF (4096*10)
32 #define CAIF_DEF_RCVBUF (4096*100)
33
34 /*
35 * CAIF state is re-using the TCP socket states.
36 * caif_states stored in sk_state reflect the state as reported by
37 * the CAIF stack, while sk_socket->state is the state of the socket.
38 */
39 enum caif_states {
40 CAIF_CONNECTED = TCP_ESTABLISHED,
41 CAIF_CONNECTING = TCP_SYN_SENT,
42 CAIF_DISCONNECTED = TCP_CLOSE
43 };
44
45 #define TX_FLOW_ON_BIT 1
46 #define RX_FLOW_ON_BIT 2
47
48 static struct dentry *debugfsdir;
49
50 #ifdef CONFIG_DEBUG_FS
51 struct debug_fs_counter {
52 atomic_t caif_nr_socks;
53 atomic_t num_connect_req;
54 atomic_t num_connect_resp;
55 atomic_t num_connect_fail_resp;
56 atomic_t num_disconnect;
57 atomic_t num_remote_shutdown_ind;
58 atomic_t num_tx_flow_off_ind;
59 atomic_t num_tx_flow_on_ind;
60 atomic_t num_rx_flow_off;
61 atomic_t num_rx_flow_on;
62 };
63 static struct debug_fs_counter cnt;
64 #define dbfs_atomic_inc(v) atomic_inc(v)
65 #define dbfs_atomic_dec(v) atomic_dec(v)
66 #else
67 #define dbfs_atomic_inc(v)
68 #define dbfs_atomic_dec(v)
69 #endif
70
71 struct caifsock {
72 struct sock sk; /* must be first member */
73 struct cflayer layer;
74 char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */
75 u32 flow_state;
76 struct caif_connect_request conn_req;
77 struct mutex readlock;
78 struct dentry *debugfs_socket_dir;
79 int headroom, tailroom, maxframe;
80 };
81
82 static int rx_flow_is_on(struct caifsock *cf_sk)
83 {
84 return test_bit(RX_FLOW_ON_BIT,
85 (void *) &cf_sk->flow_state);
86 }
87
88 static int tx_flow_is_on(struct caifsock *cf_sk)
89 {
90 return test_bit(TX_FLOW_ON_BIT,
91 (void *) &cf_sk->flow_state);
92 }
93
94 static void set_rx_flow_off(struct caifsock *cf_sk)
95 {
96 clear_bit(RX_FLOW_ON_BIT,
97 (void *) &cf_sk->flow_state);
98 }
99
100 static void set_rx_flow_on(struct caifsock *cf_sk)
101 {
102 set_bit(RX_FLOW_ON_BIT,
103 (void *) &cf_sk->flow_state);
104 }
105
106 static void set_tx_flow_off(struct caifsock *cf_sk)
107 {
108 clear_bit(TX_FLOW_ON_BIT,
109 (void *) &cf_sk->flow_state);
110 }
111
112 static void set_tx_flow_on(struct caifsock *cf_sk)
113 {
114 set_bit(TX_FLOW_ON_BIT,
115 (void *) &cf_sk->flow_state);
116 }
117
118 static void caif_read_lock(struct sock *sk)
119 {
120 struct caifsock *cf_sk;
121 cf_sk = container_of(sk, struct caifsock, sk);
122 mutex_lock(&cf_sk->readlock);
123 }
124
125 static void caif_read_unlock(struct sock *sk)
126 {
127 struct caifsock *cf_sk;
128 cf_sk = container_of(sk, struct caifsock, sk);
129 mutex_unlock(&cf_sk->readlock);
130 }
131
132 static int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
133 {
134 /* A quarter of full buffer is used a low water mark */
135 return cf_sk->sk.sk_rcvbuf / 4;
136 }
137
138 static void caif_flow_ctrl(struct sock *sk, int mode)
139 {
140 struct caifsock *cf_sk;
141 cf_sk = container_of(sk, struct caifsock, sk);
142 if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)
143 cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
144 }
145
146 /*
147 * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
148 * not dropped, but CAIF is sending flow off instead.
149 */
150 static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
151 {
152 int err;
153 int skb_len;
154 unsigned long flags;
155 struct sk_buff_head *list = &sk->sk_receive_queue;
156 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
157
158 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
159 (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
160 trace_printk("CAIF: %s():"
161 " sending flow OFF (queue len = %d %d)\n",
162 __func__,
163 atomic_read(&cf_sk->sk.sk_rmem_alloc),
164 sk_rcvbuf_lowwater(cf_sk));
165 set_rx_flow_off(cf_sk);
166 dbfs_atomic_inc(&cnt.num_rx_flow_off);
167 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
168 }
169
170 err = sk_filter(sk, skb);
171 if (err)
172 return err;
173 if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
174 set_rx_flow_off(cf_sk);
175 trace_printk("CAIF: %s():"
176 " sending flow OFF due to rmem_schedule\n",
177 __func__);
178 dbfs_atomic_inc(&cnt.num_rx_flow_off);
179 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
180 }
181 skb->dev = NULL;
182 skb_set_owner_r(skb, sk);
183 /* Cache the SKB length before we tack it onto the receive
184 * queue. Once it is added it no longer belongs to us and
185 * may be freed by other threads of control pulling packets
186 * from the queue.
187 */
188 skb_len = skb->len;
189 spin_lock_irqsave(&list->lock, flags);
190 if (!sock_flag(sk, SOCK_DEAD))
191 __skb_queue_tail(list, skb);
192 spin_unlock_irqrestore(&list->lock, flags);
193
194 if (!sock_flag(sk, SOCK_DEAD))
195 sk->sk_data_ready(sk, skb_len);
196 else
197 kfree_skb(skb);
198 return 0;
199 }
200
201 /* Packet Receive Callback function called from CAIF Stack */
202 static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
203 {
204 struct caifsock *cf_sk;
205 struct sk_buff *skb;
206
207 cf_sk = container_of(layr, struct caifsock, layer);
208 skb = cfpkt_tonative(pkt);
209
210 if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
211 cfpkt_destroy(pkt);
212 return 0;
213 }
214 caif_queue_rcv_skb(&cf_sk->sk, skb);
215 return 0;
216 }
217
218 /* Packet Control Callback function called from CAIF */
219 static void caif_ctrl_cb(struct cflayer *layr,
220 enum caif_ctrlcmd flow,
221 int phyid)
222 {
223 struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
224 switch (flow) {
225 case CAIF_CTRLCMD_FLOW_ON_IND:
226 /* OK from modem to start sending again */
227 dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
228 set_tx_flow_on(cf_sk);
229 cf_sk->sk.sk_state_change(&cf_sk->sk);
230 break;
231
232 case CAIF_CTRLCMD_FLOW_OFF_IND:
233 /* Modem asks us to shut up */
234 dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
235 set_tx_flow_off(cf_sk);
236 cf_sk->sk.sk_state_change(&cf_sk->sk);
237 break;
238
239 case CAIF_CTRLCMD_INIT_RSP:
240 /* We're now connected */
241 dbfs_atomic_inc(&cnt.num_connect_resp);
242 cf_sk->sk.sk_state = CAIF_CONNECTED;
243 set_tx_flow_on(cf_sk);
244 cf_sk->sk.sk_state_change(&cf_sk->sk);
245 break;
246
247 case CAIF_CTRLCMD_DEINIT_RSP:
248 /* We're now disconnected */
249 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
250 cf_sk->sk.sk_state_change(&cf_sk->sk);
251 cfcnfg_release_adap_layer(&cf_sk->layer);
252 break;
253
254 case CAIF_CTRLCMD_INIT_FAIL_RSP:
255 /* Connect request failed */
256 dbfs_atomic_inc(&cnt.num_connect_fail_resp);
257 cf_sk->sk.sk_err = ECONNREFUSED;
258 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
259 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
260 /*
261 * Socket "standards" seems to require POLLOUT to
262 * be set at connect failure.
263 */
264 set_tx_flow_on(cf_sk);
265 cf_sk->sk.sk_state_change(&cf_sk->sk);
266 break;
267
268 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
269 /* Modem has closed this connection, or device is down. */
270 dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
271 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
272 cf_sk->sk.sk_err = ECONNRESET;
273 set_rx_flow_on(cf_sk);
274 cf_sk->sk.sk_error_report(&cf_sk->sk);
275 break;
276
277 default:
278 pr_debug("CAIF: %s(): Unexpected flow command %d\n",
279 __func__, flow);
280 }
281 }
282
283 static void caif_check_flow_release(struct sock *sk)
284 {
285 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
286
287 if (rx_flow_is_on(cf_sk))
288 return;
289
290 if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
291 dbfs_atomic_inc(&cnt.num_rx_flow_on);
292 set_rx_flow_on(cf_sk);
293 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);
294 }
295 }
296
297 /*
298 * Copied from unix_dgram_recvmsg, but removed credit checks,
299 * changed locking, address handling and added MSG_TRUNC.
300 */
301 static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
302 struct msghdr *m, size_t len, int flags)
303
304 {
305 struct sock *sk = sock->sk;
306 struct sk_buff *skb;
307 int ret;
308 int copylen;
309
310 ret = -EOPNOTSUPP;
311 if (m->msg_flags&MSG_OOB)
312 goto read_error;
313
314 skb = skb_recv_datagram(sk, flags, 0 , &ret);
315 if (!skb)
316 goto read_error;
317 copylen = skb->len;
318 if (len < copylen) {
319 m->msg_flags |= MSG_TRUNC;
320 copylen = len;
321 }
322
323 ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen);
324 if (ret)
325 goto out_free;
326
327 ret = (flags & MSG_TRUNC) ? skb->len : copylen;
328 out_free:
329 skb_free_datagram(sk, skb);
330 caif_check_flow_release(sk);
331 return ret;
332
333 read_error:
334 return ret;
335 }
336
337
338 /* Copied from unix_stream_wait_data, identical except for lock call. */
339 static long caif_stream_data_wait(struct sock *sk, long timeo)
340 {
341 DEFINE_WAIT(wait);
342 lock_sock(sk);
343
344 for (;;) {
345 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
346
347 if (!skb_queue_empty(&sk->sk_receive_queue) ||
348 sk->sk_err ||
349 sk->sk_state != CAIF_CONNECTED ||
350 sock_flag(sk, SOCK_DEAD) ||
351 (sk->sk_shutdown & RCV_SHUTDOWN) ||
352 signal_pending(current) ||
353 !timeo)
354 break;
355
356 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
357 release_sock(sk);
358 timeo = schedule_timeout(timeo);
359 lock_sock(sk);
360 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
361 }
362
363 finish_wait(sk_sleep(sk), &wait);
364 release_sock(sk);
365 return timeo;
366 }
367
368
369 /*
370 * Copied from unix_stream_recvmsg, but removed credit checks,
371 * changed locking calls, changed address handling.
372 */
373 static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
374 struct msghdr *msg, size_t size,
375 int flags)
376 {
377 struct sock *sk = sock->sk;
378 int copied = 0;
379 int target;
380 int err = 0;
381 long timeo;
382
383 err = -EOPNOTSUPP;
384 if (flags&MSG_OOB)
385 goto out;
386
387 msg->msg_namelen = 0;
388
389 /*
390 * Lock the socket to prevent queue disordering
391 * while sleeps in memcpy_tomsg
392 */
393 err = -EAGAIN;
394 if (sk->sk_state == CAIF_CONNECTING)
395 goto out;
396
397 caif_read_lock(sk);
398 target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
399 timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
400
401 do {
402 int chunk;
403 struct sk_buff *skb;
404
405 lock_sock(sk);
406 skb = skb_dequeue(&sk->sk_receive_queue);
407 caif_check_flow_release(sk);
408
409 if (skb == NULL) {
410 if (copied >= target)
411 goto unlock;
412 /*
413 * POSIX 1003.1g mandates this order.
414 */
415 err = sock_error(sk);
416 if (err)
417 goto unlock;
418 err = -ECONNRESET;
419 if (sk->sk_shutdown & RCV_SHUTDOWN)
420 goto unlock;
421
422 err = -EPIPE;
423 if (sk->sk_state != CAIF_CONNECTED)
424 goto unlock;
425 if (sock_flag(sk, SOCK_DEAD))
426 goto unlock;
427
428 release_sock(sk);
429
430 err = -EAGAIN;
431 if (!timeo)
432 break;
433
434 caif_read_unlock(sk);
435
436 timeo = caif_stream_data_wait(sk, timeo);
437
438 if (signal_pending(current)) {
439 err = sock_intr_errno(timeo);
440 goto out;
441 }
442 caif_read_lock(sk);
443 continue;
444 unlock:
445 release_sock(sk);
446 break;
447 }
448 release_sock(sk);
449 chunk = min_t(unsigned int, skb->len, size);
450 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
451 skb_queue_head(&sk->sk_receive_queue, skb);
452 if (copied == 0)
453 copied = -EFAULT;
454 break;
455 }
456 copied += chunk;
457 size -= chunk;
458
459 /* Mark read part of skb as used */
460 if (!(flags & MSG_PEEK)) {
461 skb_pull(skb, chunk);
462
463 /* put the skb back if we didn't use it up. */
464 if (skb->len) {
465 skb_queue_head(&sk->sk_receive_queue, skb);
466 break;
467 }
468 kfree_skb(skb);
469
470 } else {
471 /*
472 * It is questionable, see note in unix_dgram_recvmsg.
473 */
474 /* put message back and return */
475 skb_queue_head(&sk->sk_receive_queue, skb);
476 break;
477 }
478 } while (size);
479 caif_read_unlock(sk);
480
481 out:
482 return copied ? : err;
483 }
484
485 /*
486 * Copied from sock.c:sock_wait_for_wmem, but change to wait for
487 * CAIF flow-on and sock_writable.
488 */
489 static long caif_wait_for_flow_on(struct caifsock *cf_sk,
490 int wait_writeable, long timeo, int *err)
491 {
492 struct sock *sk = &cf_sk->sk;
493 DEFINE_WAIT(wait);
494 for (;;) {
495 *err = 0;
496 if (tx_flow_is_on(cf_sk) &&
497 (!wait_writeable || sock_writeable(&cf_sk->sk)))
498 break;
499 *err = -ETIMEDOUT;
500 if (!timeo)
501 break;
502 *err = -ERESTARTSYS;
503 if (signal_pending(current))
504 break;
505 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
506 *err = -ECONNRESET;
507 if (sk->sk_shutdown & SHUTDOWN_MASK)
508 break;
509 *err = -sk->sk_err;
510 if (sk->sk_err)
511 break;
512 *err = -EPIPE;
513 if (cf_sk->sk.sk_state != CAIF_CONNECTED)
514 break;
515 timeo = schedule_timeout(timeo);
516 }
517 finish_wait(sk_sleep(sk), &wait);
518 return timeo;
519 }
520
521 /*
522 * Transmit a SKB. The device may temporarily request re-transmission
523 * by returning EAGAIN.
524 */
525 static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk,
526 int noblock, long timeo)
527 {
528 struct cfpkt *pkt;
529 int ret, loopcnt = 0;
530
531 pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
532 memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info));
533 do {
534
535 ret = -ETIMEDOUT;
536
537 /* Slight paranoia, probably not needed. */
538 if (unlikely(loopcnt++ > 1000)) {
539 pr_warning("CAIF: %s(): transmit retries failed,"
540 " error = %d\n", __func__, ret);
541 break;
542 }
543
544 if (cf_sk->layer.dn != NULL)
545 ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
546 if (likely(ret >= 0))
547 break;
548 /* if transmit return -EAGAIN, then retry */
549 if (noblock && ret == -EAGAIN)
550 break;
551 timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret);
552 if (signal_pending(current)) {
553 ret = sock_intr_errno(timeo);
554 break;
555 }
556 if (ret)
557 break;
558 if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
559 sock_flag(&cf_sk->sk, SOCK_DEAD) ||
560 (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) {
561 ret = -EPIPE;
562 cf_sk->sk.sk_err = EPIPE;
563 break;
564 }
565 } while (ret == -EAGAIN);
566 return ret;
567 }
568
569 /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
570 static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock,
571 struct msghdr *msg, size_t len)
572 {
573 struct sock *sk = sock->sk;
574 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
575 int buffer_size;
576 int ret = 0;
577 struct sk_buff *skb = NULL;
578 int noblock;
579 long timeo;
580 caif_assert(cf_sk);
581 ret = sock_error(sk);
582 if (ret)
583 goto err;
584
585 ret = -EOPNOTSUPP;
586 if (msg->msg_flags&MSG_OOB)
587 goto err;
588
589 ret = -EOPNOTSUPP;
590 if (msg->msg_namelen)
591 goto err;
592
593 ret = -EINVAL;
594 if (unlikely(msg->msg_iov->iov_base == NULL))
595 goto err;
596 noblock = msg->msg_flags & MSG_DONTWAIT;
597
598 timeo = sock_sndtimeo(sk, noblock);
599 timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
600 1, timeo, &ret);
601
602 if (ret)
603 goto err;
604 ret = -EPIPE;
605 if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
606 sock_flag(sk, SOCK_DEAD) ||
607 (sk->sk_shutdown & RCV_SHUTDOWN))
608 goto err;
609
610 /* Error if trying to write more than maximum frame size. */
611 ret = -EMSGSIZE;
612 if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM)
613 goto err;
614
615 buffer_size = len + cf_sk->headroom + cf_sk->tailroom;
616
617 ret = -ENOMEM;
618 skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
619
620 if (!skb || skb_tailroom(skb) < buffer_size)
621 goto err;
622
623 skb_reserve(skb, cf_sk->headroom);
624
625 ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
626
627 if (ret)
628 goto err;
629 ret = transmit_skb(skb, cf_sk, noblock, timeo);
630 if (ret < 0)
631 goto err;
632 return len;
633 err:
634 kfree_skb(skb);
635 return ret;
636 }
637
638 /*
639 * Copied from unix_stream_sendmsg and adapted to CAIF:
640 * Changed removed permission handling and added waiting for flow on
641 * and other minor adaptations.
642 */
643 static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
644 struct msghdr *msg, size_t len)
645 {
646 struct sock *sk = sock->sk;
647 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
648 int err, size;
649 struct sk_buff *skb;
650 int sent = 0;
651 long timeo;
652
653 err = -EOPNOTSUPP;
654 if (unlikely(msg->msg_flags&MSG_OOB))
655 goto out_err;
656
657 if (unlikely(msg->msg_namelen))
658 goto out_err;
659
660 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
661 timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err);
662
663 if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN))
664 goto pipe_err;
665
666 while (sent < len) {
667
668 size = len-sent;
669
670 if (size > cf_sk->maxframe)
671 size = cf_sk->maxframe;
672
673 /* If size is more than half of sndbuf, chop up message */
674 if (size > ((sk->sk_sndbuf >> 1) - 64))
675 size = (sk->sk_sndbuf >> 1) - 64;
676
677 if (size > SKB_MAX_ALLOC)
678 size = SKB_MAX_ALLOC;
679
680 skb = sock_alloc_send_skb(sk,
681 size + cf_sk->headroom +
682 cf_sk->tailroom,
683 msg->msg_flags&MSG_DONTWAIT,
684 &err);
685 if (skb == NULL)
686 goto out_err;
687
688 skb_reserve(skb, cf_sk->headroom);
689 /*
690 * If you pass two values to the sock_alloc_send_skb
691 * it tries to grab the large buffer with GFP_NOFS
692 * (which can fail easily), and if it fails grab the
693 * fallback size buffer which is under a page and will
694 * succeed. [Alan]
695 */
696 size = min_t(int, size, skb_tailroom(skb));
697
698 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
699 if (err) {
700 kfree_skb(skb);
701 goto out_err;
702 }
703 err = transmit_skb(skb, cf_sk,
704 msg->msg_flags&MSG_DONTWAIT, timeo);
705 if (err < 0) {
706 kfree_skb(skb);
707 goto pipe_err;
708 }
709 sent += size;
710 }
711
712 return sent;
713
714 pipe_err:
715 if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
716 send_sig(SIGPIPE, current, 0);
717 err = -EPIPE;
718 out_err:
719 return sent ? : err;
720 }
721
722 static int setsockopt(struct socket *sock,
723 int lvl, int opt, char __user *ov, unsigned int ol)
724 {
725 struct sock *sk = sock->sk;
726 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
727 int prio, linksel;
728 struct ifreq ifreq;
729
730 if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
731 return -ENOPROTOOPT;
732
733 switch (opt) {
734 case CAIFSO_LINK_SELECT:
735 if (ol < sizeof(int))
736 return -EINVAL;
737 if (lvl != SOL_CAIF)
738 goto bad_sol;
739 if (copy_from_user(&linksel, ov, sizeof(int)))
740 return -EINVAL;
741 lock_sock(&(cf_sk->sk));
742 cf_sk->conn_req.link_selector = linksel;
743 release_sock(&cf_sk->sk);
744 return 0;
745
746 case SO_PRIORITY:
747 if (lvl != SOL_SOCKET)
748 goto bad_sol;
749 if (ol < sizeof(int))
750 return -EINVAL;
751 if (copy_from_user(&prio, ov, sizeof(int)))
752 return -EINVAL;
753 lock_sock(&(cf_sk->sk));
754 cf_sk->conn_req.priority = prio;
755 release_sock(&cf_sk->sk);
756 return 0;
757
758 case SO_BINDTODEVICE:
759 if (lvl != SOL_SOCKET)
760 goto bad_sol;
761 if (ol < sizeof(struct ifreq))
762 return -EINVAL;
763 if (copy_from_user(&ifreq, ov, sizeof(ifreq)))
764 return -EFAULT;
765 lock_sock(&(cf_sk->sk));
766 strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name,
767 sizeof(cf_sk->conn_req.link_name));
768 cf_sk->conn_req.link_name
769 [sizeof(cf_sk->conn_req.link_name)-1] = 0;
770 release_sock(&cf_sk->sk);
771 return 0;
772
773 case CAIFSO_REQ_PARAM:
774 if (lvl != SOL_CAIF)
775 goto bad_sol;
776 if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL)
777 return -ENOPROTOOPT;
778 lock_sock(&(cf_sk->sk));
779 cf_sk->conn_req.param.size = ol;
780 if (ol > sizeof(cf_sk->conn_req.param.data) ||
781 copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
782 release_sock(&cf_sk->sk);
783 return -EINVAL;
784 }
785 release_sock(&cf_sk->sk);
786 return 0;
787
788 default:
789 return -ENOPROTOOPT;
790 }
791
792 return 0;
793 bad_sol:
794 return -ENOPROTOOPT;
795
796 }
797
798 /*
799 * caif_connect() - Connect a CAIF Socket
800 * Copied and modified af_irda.c:irda_connect().
801 *
802 * Note : by consulting "errno", the user space caller may learn the cause
803 * of the failure. Most of them are visible in the function, others may come
804 * from subroutines called and are listed here :
805 * o -EAFNOSUPPORT: bad socket family or type.
806 * o -ESOCKTNOSUPPORT: bad socket type or protocol
807 * o -EINVAL: bad socket address, or CAIF link type
808 * o -ECONNREFUSED: remote end refused the connection.
809 * o -EINPROGRESS: connect request sent but timed out (or non-blocking)
810 * o -EISCONN: already connected.
811 * o -ETIMEDOUT: Connection timed out (send timeout)
812 * o -ENODEV: No link layer to send request
813 * o -ECONNRESET: Received Shutdown indication or lost link layer
814 * o -ENOMEM: Out of memory
815 *
816 * State Strategy:
817 * o sk_state: holds the CAIF_* protocol state, it's updated by
818 * caif_ctrl_cb.
819 * o sock->state: holds the SS_* socket state and is updated by connect and
820 * disconnect.
821 */
822 static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
823 int addr_len, int flags)
824 {
825 struct sock *sk = sock->sk;
826 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
827 long timeo;
828 int err;
829 int ifindex, headroom, tailroom;
830 struct net_device *dev;
831
832 lock_sock(sk);
833
834 err = -EAFNOSUPPORT;
835 if (uaddr->sa_family != AF_CAIF)
836 goto out;
837
838 switch (sock->state) {
839 case SS_UNCONNECTED:
840 /* Normal case, a fresh connect */
841 caif_assert(sk->sk_state == CAIF_DISCONNECTED);
842 break;
843 case SS_CONNECTING:
844 switch (sk->sk_state) {
845 case CAIF_CONNECTED:
846 sock->state = SS_CONNECTED;
847 err = -EISCONN;
848 goto out;
849 case CAIF_DISCONNECTED:
850 /* Reconnect allowed */
851 break;
852 case CAIF_CONNECTING:
853 err = -EALREADY;
854 if (flags & O_NONBLOCK)
855 goto out;
856 goto wait_connect;
857 }
858 break;
859 case SS_CONNECTED:
860 caif_assert(sk->sk_state == CAIF_CONNECTED ||
861 sk->sk_state == CAIF_DISCONNECTED);
862 if (sk->sk_shutdown & SHUTDOWN_MASK) {
863 /* Allow re-connect after SHUTDOWN_IND */
864 caif_disconnect_client(&cf_sk->layer);
865 break;
866 }
867 /* No reconnect on a seqpacket socket */
868 err = -EISCONN;
869 goto out;
870 case SS_DISCONNECTING:
871 case SS_FREE:
872 caif_assert(1); /*Should never happen */
873 break;
874 }
875 sk->sk_state = CAIF_DISCONNECTED;
876 sock->state = SS_UNCONNECTED;
877 sk_stream_kill_queues(&cf_sk->sk);
878
879 err = -EINVAL;
880 if (addr_len != sizeof(struct sockaddr_caif))
881 goto out;
882
883 memcpy(&cf_sk->conn_req.sockaddr, uaddr,
884 sizeof(struct sockaddr_caif));
885
886 /* Move to connecting socket, start sending Connect Requests */
887 sock->state = SS_CONNECTING;
888 sk->sk_state = CAIF_CONNECTING;
889
890 dbfs_atomic_inc(&cnt.num_connect_req);
891 cf_sk->layer.receive = caif_sktrecv_cb;
892 err = caif_connect_client(&cf_sk->conn_req,
893 &cf_sk->layer, &ifindex, &headroom, &tailroom);
894 if (err < 0) {
895 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
896 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
897 goto out;
898 }
899 dev = dev_get_by_index(sock_net(sk), ifindex);
900 cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom);
901 cf_sk->tailroom = tailroom;
902 cf_sk->maxframe = dev->mtu - (headroom + tailroom);
903 dev_put(dev);
904 if (cf_sk->maxframe < 1) {
905 pr_warning("CAIF: %s(): CAIF Interface MTU too small (%d)\n",
906 __func__, dev->mtu);
907 err = -ENODEV;
908 goto out;
909 }
910
911 err = -EINPROGRESS;
912 wait_connect:
913
914 if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
915 goto out;
916
917 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
918
919 release_sock(sk);
920 err = -ERESTARTSYS;
921 timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
922 sk->sk_state != CAIF_CONNECTING,
923 timeo);
924 lock_sock(sk);
925 if (timeo < 0)
926 goto out; /* -ERESTARTSYS */
927
928 err = -ETIMEDOUT;
929 if (timeo == 0 && sk->sk_state != CAIF_CONNECTED)
930 goto out;
931 if (sk->sk_state != CAIF_CONNECTED) {
932 sock->state = SS_UNCONNECTED;
933 err = sock_error(sk);
934 if (!err)
935 err = -ECONNREFUSED;
936 goto out;
937 }
938 sock->state = SS_CONNECTED;
939 err = 0;
940 out:
941 release_sock(sk);
942 return err;
943 }
944
945 /*
946 * caif_release() - Disconnect a CAIF Socket
947 * Copied and modified af_irda.c:irda_release().
948 */
949 static int caif_release(struct socket *sock)
950 {
951 struct sock *sk = sock->sk;
952 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
953 int res = 0;
954
955 if (!sk)
956 return 0;
957
958 set_tx_flow_off(cf_sk);
959
960 /*
961 * Ensure that packets are not queued after this point in time.
962 * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
963 * this ensures no packets when sock is dead.
964 */
965 spin_lock(&sk->sk_receive_queue.lock);
966 sock_set_flag(sk, SOCK_DEAD);
967 spin_unlock(&sk->sk_receive_queue.lock);
968 sock->sk = NULL;
969
970 dbfs_atomic_inc(&cnt.num_disconnect);
971
972 if (cf_sk->debugfs_socket_dir != NULL)
973 debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
974
975 lock_sock(&(cf_sk->sk));
976 sk->sk_state = CAIF_DISCONNECTED;
977 sk->sk_shutdown = SHUTDOWN_MASK;
978
979 if (cf_sk->sk.sk_socket->state == SS_CONNECTED ||
980 cf_sk->sk.sk_socket->state == SS_CONNECTING)
981 res = caif_disconnect_client(&cf_sk->layer);
982
983 cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
984 wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
985
986 sock_orphan(sk);
987 cf_sk->layer.dn = NULL;
988 sk_stream_kill_queues(&cf_sk->sk);
989 release_sock(sk);
990 sock_put(sk);
991 return res;
992 }
993
994 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
995 static unsigned int caif_poll(struct file *file,
996 struct socket *sock, poll_table *wait)
997 {
998 struct sock *sk = sock->sk;
999 unsigned int mask;
1000 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1001
1002 sock_poll_wait(file, sk_sleep(sk), wait);
1003 mask = 0;
1004
1005 /* exceptional events? */
1006 if (sk->sk_err)
1007 mask |= POLLERR;
1008 if (sk->sk_shutdown == SHUTDOWN_MASK)
1009 mask |= POLLHUP;
1010 if (sk->sk_shutdown & RCV_SHUTDOWN)
1011 mask |= POLLRDHUP;
1012
1013 /* readable? */
1014 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1015 (sk->sk_shutdown & RCV_SHUTDOWN))
1016 mask |= POLLIN | POLLRDNORM;
1017
1018 /*
1019 * we set writable also when the other side has shut down the
1020 * connection. This prevents stuck sockets.
1021 */
1022 if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
1023 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1024
1025 return mask;
1026 }
1027
1028 static const struct proto_ops caif_seqpacket_ops = {
1029 .family = PF_CAIF,
1030 .owner = THIS_MODULE,
1031 .release = caif_release,
1032 .bind = sock_no_bind,
1033 .connect = caif_connect,
1034 .socketpair = sock_no_socketpair,
1035 .accept = sock_no_accept,
1036 .getname = sock_no_getname,
1037 .poll = caif_poll,
1038 .ioctl = sock_no_ioctl,
1039 .listen = sock_no_listen,
1040 .shutdown = sock_no_shutdown,
1041 .setsockopt = setsockopt,
1042 .getsockopt = sock_no_getsockopt,
1043 .sendmsg = caif_seqpkt_sendmsg,
1044 .recvmsg = caif_seqpkt_recvmsg,
1045 .mmap = sock_no_mmap,
1046 .sendpage = sock_no_sendpage,
1047 };
1048
1049 static const struct proto_ops caif_stream_ops = {
1050 .family = PF_CAIF,
1051 .owner = THIS_MODULE,
1052 .release = caif_release,
1053 .bind = sock_no_bind,
1054 .connect = caif_connect,
1055 .socketpair = sock_no_socketpair,
1056 .accept = sock_no_accept,
1057 .getname = sock_no_getname,
1058 .poll = caif_poll,
1059 .ioctl = sock_no_ioctl,
1060 .listen = sock_no_listen,
1061 .shutdown = sock_no_shutdown,
1062 .setsockopt = setsockopt,
1063 .getsockopt = sock_no_getsockopt,
1064 .sendmsg = caif_stream_sendmsg,
1065 .recvmsg = caif_stream_recvmsg,
1066 .mmap = sock_no_mmap,
1067 .sendpage = sock_no_sendpage,
1068 };
1069
1070 /* This function is called when a socket is finally destroyed. */
1071 static void caif_sock_destructor(struct sock *sk)
1072 {
1073 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1074 caif_assert(!atomic_read(&sk->sk_wmem_alloc));
1075 caif_assert(sk_unhashed(sk));
1076 caif_assert(!sk->sk_socket);
1077 if (!sock_flag(sk, SOCK_DEAD)) {
1078 pr_info("Attempt to release alive CAIF socket: %p\n", sk);
1079 return;
1080 }
1081 sk_stream_kill_queues(&cf_sk->sk);
1082 dbfs_atomic_dec(&cnt.caif_nr_socks);
1083 }
1084
1085 static int caif_create(struct net *net, struct socket *sock, int protocol,
1086 int kern)
1087 {
1088 struct sock *sk = NULL;
1089 struct caifsock *cf_sk = NULL;
1090 static struct proto prot = {.name = "PF_CAIF",
1091 .owner = THIS_MODULE,
1092 .obj_size = sizeof(struct caifsock),
1093 };
1094
1095 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
1096 return -EPERM;
1097 /*
1098 * The sock->type specifies the socket type to use.
1099 * The CAIF socket is a packet stream in the sense
1100 * that it is packet based. CAIF trusts the reliability
1101 * of the link, no resending is implemented.
1102 */
1103 if (sock->type == SOCK_SEQPACKET)
1104 sock->ops = &caif_seqpacket_ops;
1105 else if (sock->type == SOCK_STREAM)
1106 sock->ops = &caif_stream_ops;
1107 else
1108 return -ESOCKTNOSUPPORT;
1109
1110 if (protocol < 0 || protocol >= CAIFPROTO_MAX)
1111 return -EPROTONOSUPPORT;
1112 /*
1113 * Set the socket state to unconnected. The socket state
1114 * is really not used at all in the net/core or socket.c but the
1115 * initialization makes sure that sock->state is not uninitialized.
1116 */
1117 sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
1118 if (!sk)
1119 return -ENOMEM;
1120
1121 cf_sk = container_of(sk, struct caifsock, sk);
1122
1123 /* Store the protocol */
1124 sk->sk_protocol = (unsigned char) protocol;
1125
1126 /* Sendbuf dictates the amount of outbound packets not yet sent */
1127 sk->sk_sndbuf = CAIF_DEF_SNDBUF;
1128 sk->sk_rcvbuf = CAIF_DEF_RCVBUF;
1129
1130 /*
1131 * Lock in order to try to stop someone from opening the socket
1132 * too early.
1133 */
1134 lock_sock(&(cf_sk->sk));
1135
1136 /* Initialize the nozero default sock structure data. */
1137 sock_init_data(sock, sk);
1138 sk->sk_destruct = caif_sock_destructor;
1139
1140 mutex_init(&cf_sk->readlock); /* single task reading lock */
1141 cf_sk->layer.ctrlcmd = caif_ctrl_cb;
1142 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
1143 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
1144
1145 set_tx_flow_off(cf_sk);
1146 set_rx_flow_on(cf_sk);
1147
1148 /* Set default options on configuration */
1149 cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
1150 cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
1151 cf_sk->conn_req.protocol = protocol;
1152 /* Increase the number of sockets created. */
1153 dbfs_atomic_inc(&cnt.caif_nr_socks);
1154 #ifdef CONFIG_DEBUG_FS
1155 if (!IS_ERR(debugfsdir)) {
1156 /* Fill in some information concerning the misc socket. */
1157 snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
1158 atomic_read(&cnt.caif_nr_socks));
1159
1160 cf_sk->debugfs_socket_dir =
1161 debugfs_create_dir(cf_sk->name, debugfsdir);
1162 debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
1163 cf_sk->debugfs_socket_dir,
1164 (u32 *) &cf_sk->sk.sk_state);
1165 debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
1166 cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
1167 debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
1168 cf_sk->debugfs_socket_dir,
1169 (u32 *) &cf_sk->sk.sk_rmem_alloc);
1170 debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
1171 cf_sk->debugfs_socket_dir,
1172 (u32 *) &cf_sk->sk.sk_wmem_alloc);
1173 debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
1174 cf_sk->debugfs_socket_dir,
1175 (u32 *) &cf_sk->layer.id);
1176 }
1177 #endif
1178 release_sock(&cf_sk->sk);
1179 return 0;
1180 }
1181
1182
1183 static struct net_proto_family caif_family_ops = {
1184 .family = PF_CAIF,
1185 .create = caif_create,
1186 .owner = THIS_MODULE,
1187 };
1188
1189 static int af_caif_init(void)
1190 {
1191 int err = sock_register(&caif_family_ops);
1192 if (!err)
1193 return err;
1194 return 0;
1195 }
1196
1197 static int __init caif_sktinit_module(void)
1198 {
1199 #ifdef CONFIG_DEBUG_FS
1200 debugfsdir = debugfs_create_dir("caif_sk", NULL);
1201 if (!IS_ERR(debugfsdir)) {
1202 debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
1203 debugfsdir,
1204 (u32 *) &cnt.caif_nr_socks);
1205 debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
1206 debugfsdir,
1207 (u32 *) &cnt.num_connect_req);
1208 debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
1209 debugfsdir,
1210 (u32 *) &cnt.num_connect_resp);
1211 debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
1212 debugfsdir,
1213 (u32 *) &cnt.num_connect_fail_resp);
1214 debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
1215 debugfsdir,
1216 (u32 *) &cnt.num_disconnect);
1217 debugfs_create_u32("num_remote_shutdown_ind",
1218 S_IRUSR | S_IWUSR, debugfsdir,
1219 (u32 *) &cnt.num_remote_shutdown_ind);
1220 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
1221 debugfsdir,
1222 (u32 *) &cnt.num_tx_flow_off_ind);
1223 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
1224 debugfsdir,
1225 (u32 *) &cnt.num_tx_flow_on_ind);
1226 debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
1227 debugfsdir,
1228 (u32 *) &cnt.num_rx_flow_off);
1229 debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
1230 debugfsdir,
1231 (u32 *) &cnt.num_rx_flow_on);
1232 }
1233 #endif
1234 return af_caif_init();
1235 }
1236
1237 static void __exit caif_sktexit_module(void)
1238 {
1239 sock_unregister(PF_CAIF);
1240 if (debugfsdir != NULL)
1241 debugfs_remove_recursive(debugfsdir);
1242 }
1243 module_init(caif_sktinit_module);
1244 module_exit(caif_sktexit_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree