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TOMOYO Linux Cross Reference
Linux/net/caif/caif_socket.c

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  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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
  8 
  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>
 20 #include <linux/debugfs.h>
 21 #include <linux/caif/caif_socket.h>
 22 #include <linux/atomic.h>
 23 #include <net/sock.h>
 24 #include <net/tcp_states.h>
 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");
 30 MODULE_ALIAS_NETPROTO(AF_CAIF);
 31 
 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
 45 
 46 static struct dentry *debugfsdir;
 47 
 48 #ifdef CONFIG_DEBUG_FS
 49 struct debug_fs_counter {
 50         atomic_t caif_nr_socks;
 51         atomic_t caif_sock_create;
 52         atomic_t num_connect_req;
 53         atomic_t num_connect_resp;
 54         atomic_t num_connect_fail_resp;
 55         atomic_t num_disconnect;
 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;
 61 };
 62 static struct debug_fs_counter cnt;
 63 #define dbfs_atomic_inc(v) atomic_inc_return(v)
 64 #define dbfs_atomic_dec(v) atomic_dec_return(v)
 65 #else
 66 #define dbfs_atomic_inc(v) 0
 67 #define dbfs_atomic_dec(v) 0
 68 #endif
 69 
 70 struct caifsock {
 71         struct sock sk; /* must be first member */
 72         struct cflayer layer;
 73         char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */
 74         u32 flow_state;
 75         struct caif_connect_request conn_req;
 76         struct mutex readlock;
 77         struct dentry *debugfs_socket_dir;
 78         int headroom, tailroom, maxframe;
 79 };
 80 
 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 }
 92 
 93 static void set_rx_flow_off(struct caifsock *cf_sk)
 94 {
 95          clear_bit(RX_FLOW_ON_BIT,
 96                  (void *) &cf_sk->flow_state);
 97 }
 98 
 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 }
104 
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 }
110 
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 }
116 
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 }
123 
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 }
130 
131 static int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
132 {
133         /* A quarter of full buffer is used a low water mark */
134         return cf_sk->sk.sk_rcvbuf / 4;
135 }
136 
137 static void caif_flow_ctrl(struct sock *sk, int mode)
138 {
139         struct caifsock *cf_sk;
140         cf_sk = container_of(sk, struct caifsock, sk);
141         if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)
142                 cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
143 }
144 
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  */
149 static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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);
156 
157         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
158                 (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
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));
163                 set_rx_flow_off(cf_sk);
164                 dbfs_atomic_inc(&cnt.num_rx_flow_off);
165                 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
166         }
167 
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);
173                 if (net_ratelimit())
174                         pr_debug("sending flow OFF due to rmem_schedule\n");
175                 dbfs_atomic_inc(&cnt.num_rx_flow_off);
176                 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
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);
195         return 0;
196 }
197 
198 /* Packet Receive Callback function called from CAIF Stack */
199 static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
200 {
201         struct caifsock *cf_sk;
202         struct sk_buff *skb;
203 
204         cf_sk = container_of(layr, struct caifsock, layer);
205         skb = cfpkt_tonative(pkt);
206 
207         if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
208                 kfree_skb(skb);
209                 return 0;
210         }
211         caif_queue_rcv_skb(&cf_sk->sk, skb);
212         return 0;
213 }
214 
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 
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);
233         switch (flow) {
234         case CAIF_CTRLCMD_FLOW_ON_IND:
235                 /* OK from modem to start sending again */
236                 dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
237                 set_tx_flow_on(cf_sk);
238                 cf_sk->sk.sk_state_change(&cf_sk->sk);
239                 break;
240 
241         case CAIF_CTRLCMD_FLOW_OFF_IND:
242                 /* Modem asks us to shut up */
243                 dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
244                 set_tx_flow_off(cf_sk);
245                 cf_sk->sk.sk_state_change(&cf_sk->sk);
246                 break;
247 
248         case CAIF_CTRLCMD_INIT_RSP:
249                 /* We're now connected */
250                 caif_client_register_refcnt(&cf_sk->layer,
251                                                 cfsk_hold, cfsk_put);
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);
256                 break;
257 
258         case CAIF_CTRLCMD_DEINIT_RSP:
259                 /* We're now disconnected */
260                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
261                 cf_sk->sk.sk_state_change(&cf_sk->sk);
262                 break;
263 
264         case CAIF_CTRLCMD_INIT_FAIL_RSP:
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);
276                 break;
277 
278         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
279                 /* Modem has closed this connection, or device is down. */
280                 dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
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);
285                 break;
286 
287         default:
288                 pr_debug("Unexpected flow command %d\n", flow);
289         }
290 }
291 
292 static void caif_check_flow_release(struct sock *sk)
293 {
294         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
295 
296         if (rx_flow_is_on(cf_sk))
297                 return;
298 
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);
302                         caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);
303         }
304 }
305 
306 /*
307  * Copied from unix_dgram_recvmsg, but removed credit checks,
308  * changed locking, address handling and added MSG_TRUNC.
309  */
310 static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
311                                 struct msghdr *m, size_t len, int flags)
312 
313 {
314         struct sock *sk = sock->sk;
315         struct sk_buff *skb;
316         int ret;
317         int copylen;
318 
319         ret = -EOPNOTSUPP;
320         if (m->msg_flags&MSG_OOB)
321                 goto read_error;
322 
323         skb = skb_recv_datagram(sk, flags, 0 , &ret);
324         if (!skb)
325                 goto read_error;
326         copylen = skb->len;
327         if (len < copylen) {
328                 m->msg_flags |= MSG_TRUNC;
329                 copylen = len;
330         }
331 
332         ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen);
333         if (ret)
334                 goto out_free;
335 
336         ret = (flags & MSG_TRUNC) ? skb->len : copylen;
337 out_free:
338         skb_free_datagram(sk, skb);
339         caif_check_flow_release(sk);
340         return ret;
341 
342 read_error:
343         return ret;
344 }
345 
346 
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;
364 
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);
370         }
371 
372         finish_wait(sk_sleep(sk), &wait);
373         release_sock(sk);
374         return timeo;
375 }
376 
377 
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;
391 
392         err = -EOPNOTSUPP;
393         if (flags&MSG_OOB)
394                 goto out;
395 
396         msg->msg_namelen = 0;
397 
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;
405 
406         caif_read_lock(sk);
407         target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
408         timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
409 
410         do {
411                 int chunk;
412                 struct sk_buff *skb;
413 
414                 lock_sock(sk);
415                 skb = skb_dequeue(&sk->sk_receive_queue);
416                 caif_check_flow_release(sk);
417 
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;
430 
431                         err = -EPIPE;
432                         if (sk->sk_state != CAIF_CONNECTED)
433                                 goto unlock;
434                         if (sock_flag(sk, SOCK_DEAD))
435                                 goto unlock;
436 
437                         release_sock(sk);
438 
439                         err = -EAGAIN;
440                         if (!timeo)
441                                 break;
442 
443                         caif_read_unlock(sk);
444 
445                         timeo = caif_stream_data_wait(sk, timeo);
446 
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;
456                 }
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;
467 
468                 /* Mark read part of skb as used */
469                 if (!(flags & MSG_PEEK)) {
470                         skb_pull(skb, chunk);
471 
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);
478 
479                 } else {
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;
486                 }
487         } while (size);
488         caif_read_unlock(sk);
489 
490 out:
491         return copied ? : err;
492 }
493 
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);
525         }
526         finish_wait(sk_sleep(sk), &wait);
527         return timeo;
528 }
529 
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;
538 
539         pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
540         memset(skb->cb, 0, sizeof(struct caif_payload_info));
541 
542         if (cf_sk->layer.dn == NULL) {
543                 kfree_skb(skb);
544                 return -EINVAL;
545         }
546 
547         return cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
548 }
549 
550 /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
551 static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock,
552                         struct msghdr *msg, size_t len)
553 {
554         struct sock *sk = sock->sk;
555         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
556         int buffer_size;
557         int ret = 0;
558         struct sk_buff *skb = NULL;
559         int noblock;
560         long timeo;
561         caif_assert(cf_sk);
562         ret = sock_error(sk);
563         if (ret)
564                 goto err;
565 
566         ret = -EOPNOTSUPP;
567         if (msg->msg_flags&MSG_OOB)
568                 goto err;
569 
570         ret = -EOPNOTSUPP;
571         if (msg->msg_namelen)
572                 goto err;
573 
574         ret = -EINVAL;
575         if (unlikely(msg->msg_iov->iov_base == NULL))
576                 goto err;
577         noblock = msg->msg_flags & MSG_DONTWAIT;
578 
579         timeo = sock_sndtimeo(sk, noblock);
580         timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
581                                 1, timeo, &ret);
582 
583         if (ret)
584                 goto err;
585         ret = -EPIPE;
586         if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
587                 sock_flag(sk, SOCK_DEAD) ||
588                 (sk->sk_shutdown & RCV_SHUTDOWN))
589                 goto err;
590 
591         /* Error if trying to write more than maximum frame size. */
592         ret = -EMSGSIZE;
593         if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM)
594                 goto err;
595 
596         buffer_size = len + cf_sk->headroom + cf_sk->tailroom;
597 
598         ret = -ENOMEM;
599         skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
600 
601         if (!skb || skb_tailroom(skb) < buffer_size)
602                 goto err;
603 
604         skb_reserve(skb, cf_sk->headroom);
605 
606         ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
607 
608         if (ret)
609                 goto err;
610         ret = transmit_skb(skb, cf_sk, noblock, timeo);
611         if (ret < 0)
612                 /* skb is already freed */
613                 return ret;
614 
615         return len;
616 err:
617         kfree_skb(skb);
618         return ret;
619 }
620 
621 /*
622  * Copied from unix_stream_sendmsg and adapted to CAIF:
623  * Changed removed permission handling and added waiting for flow on
624  * and other minor adaptations.
625  */
626 static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
627                                 struct msghdr *msg, size_t len)
628 {
629         struct sock *sk = sock->sk;
630         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
631         int err, size;
632         struct sk_buff *skb;
633         int sent = 0;
634         long timeo;
635 
636         err = -EOPNOTSUPP;
637         if (unlikely(msg->msg_flags&MSG_OOB))
638                 goto out_err;
639 
640         if (unlikely(msg->msg_namelen))
641                 goto out_err;
642 
643         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
644         timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err);
645 
646         if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN))
647                 goto pipe_err;
648 
649         while (sent < len) {
650 
651                 size = len-sent;
652 
653                 if (size > cf_sk->maxframe)
654                         size = cf_sk->maxframe;
655 
656                 /* If size is more than half of sndbuf, chop up message */
657                 if (size > ((sk->sk_sndbuf >> 1) - 64))
658                         size = (sk->sk_sndbuf >> 1) - 64;
659 
660                 if (size > SKB_MAX_ALLOC)
661                         size = SKB_MAX_ALLOC;
662 
663                 skb = sock_alloc_send_skb(sk,
664                                         size + cf_sk->headroom +
665                                         cf_sk->tailroom,
666                                         msg->msg_flags&MSG_DONTWAIT,
667                                         &err);
668                 if (skb == NULL)
669                         goto out_err;
670 
671                 skb_reserve(skb, cf_sk->headroom);
672                 /*
673                  *      If you pass two values to the sock_alloc_send_skb
674                  *      it tries to grab the large buffer with GFP_NOFS
675                  *      (which can fail easily), and if it fails grab the
676                  *      fallback size buffer which is under a page and will
677                  *      succeed. [Alan]
678                  */
679                 size = min_t(int, size, skb_tailroom(skb));
680 
681                 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
682                 if (err) {
683                         kfree_skb(skb);
684                         goto out_err;
685                 }
686                 err = transmit_skb(skb, cf_sk,
687                                 msg->msg_flags&MSG_DONTWAIT, timeo);
688                 if (err < 0)
689                         /* skb is already freed */
690                         goto pipe_err;
691 
692                 sent += size;
693         }
694 
695         return sent;
696 
697 pipe_err:
698         if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
699                 send_sig(SIGPIPE, current, 0);
700         err = -EPIPE;
701 out_err:
702         return sent ? : err;
703 }
704 
705 static int setsockopt(struct socket *sock,
706                         int lvl, int opt, char __user *ov, unsigned int ol)
707 {
708         struct sock *sk = sock->sk;
709         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
710         int linksel;
711 
712         if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
713                 return -ENOPROTOOPT;
714 
715         switch (opt) {
716         case CAIFSO_LINK_SELECT:
717                 if (ol < sizeof(int))
718                         return -EINVAL;
719                 if (lvl != SOL_CAIF)
720                         goto bad_sol;
721                 if (copy_from_user(&linksel, ov, sizeof(int)))
722                         return -EINVAL;
723                 lock_sock(&(cf_sk->sk));
724                 cf_sk->conn_req.link_selector = linksel;
725                 release_sock(&cf_sk->sk);
726                 return 0;
727 
728         case CAIFSO_REQ_PARAM:
729                 if (lvl != SOL_CAIF)
730                         goto bad_sol;
731                 if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL)
732                         return -ENOPROTOOPT;
733                 lock_sock(&(cf_sk->sk));
734                 if (ol > sizeof(cf_sk->conn_req.param.data) ||
735                         copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
736                         release_sock(&cf_sk->sk);
737                         return -EINVAL;
738                 }
739                 cf_sk->conn_req.param.size = ol;
740                 release_sock(&cf_sk->sk);
741                 return 0;
742 
743         default:
744                 return -ENOPROTOOPT;
745         }
746 
747         return 0;
748 bad_sol:
749         return -ENOPROTOOPT;
750 
751 }
752 
753 /*
754  * caif_connect() - Connect a CAIF Socket
755  * Copied and modified af_irda.c:irda_connect().
756  *
757  * Note : by consulting "errno", the user space caller may learn the cause
758  * of the failure. Most of them are visible in the function, others may come
759  * from subroutines called and are listed here :
760  *  o -EAFNOSUPPORT: bad socket family or type.
761  *  o -ESOCKTNOSUPPORT: bad socket type or protocol
762  *  o -EINVAL: bad socket address, or CAIF link type
763  *  o -ECONNREFUSED: remote end refused the connection.
764  *  o -EINPROGRESS: connect request sent but timed out (or non-blocking)
765  *  o -EISCONN: already connected.
766  *  o -ETIMEDOUT: Connection timed out (send timeout)
767  *  o -ENODEV: No link layer to send request
768  *  o -ECONNRESET: Received Shutdown indication or lost link layer
769  *  o -ENOMEM: Out of memory
770  *
771  *  State Strategy:
772  *  o sk_state: holds the CAIF_* protocol state, it's updated by
773  *      caif_ctrl_cb.
774  *  o sock->state: holds the SS_* socket state and is updated by connect and
775  *      disconnect.
776  */
777 static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
778                         int addr_len, int flags)
779 {
780         struct sock *sk = sock->sk;
781         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
782         long timeo;
783         int err;
784         int ifindex, headroom, tailroom;
785         unsigned int mtu;
786         struct net_device *dev;
787 
788         lock_sock(sk);
789 
790         err = -EAFNOSUPPORT;
791         if (uaddr->sa_family != AF_CAIF)
792                 goto out;
793 
794         switch (sock->state) {
795         case SS_UNCONNECTED:
796                 /* Normal case, a fresh connect */
797                 caif_assert(sk->sk_state == CAIF_DISCONNECTED);
798                 break;
799         case SS_CONNECTING:
800                 switch (sk->sk_state) {
801                 case CAIF_CONNECTED:
802                         sock->state = SS_CONNECTED;
803                         err = -EISCONN;
804                         goto out;
805                 case CAIF_DISCONNECTED:
806                         /* Reconnect allowed */
807                         break;
808                 case CAIF_CONNECTING:
809                         err = -EALREADY;
810                         if (flags & O_NONBLOCK)
811                                 goto out;
812                         goto wait_connect;
813                 }
814                 break;
815         case SS_CONNECTED:
816                 caif_assert(sk->sk_state == CAIF_CONNECTED ||
817                                 sk->sk_state == CAIF_DISCONNECTED);
818                 if (sk->sk_shutdown & SHUTDOWN_MASK) {
819                         /* Allow re-connect after SHUTDOWN_IND */
820                         caif_disconnect_client(sock_net(sk), &cf_sk->layer);
821                         caif_free_client(&cf_sk->layer);
822                         break;
823                 }
824                 /* No reconnect on a seqpacket socket */
825                 err = -EISCONN;
826                 goto out;
827         case SS_DISCONNECTING:
828         case SS_FREE:
829                 caif_assert(1); /*Should never happen */
830                 break;
831         }
832         sk->sk_state = CAIF_DISCONNECTED;
833         sock->state = SS_UNCONNECTED;
834         sk_stream_kill_queues(&cf_sk->sk);
835 
836         err = -EINVAL;
837         if (addr_len != sizeof(struct sockaddr_caif))
838                 goto out;
839 
840         memcpy(&cf_sk->conn_req.sockaddr, uaddr,
841                 sizeof(struct sockaddr_caif));
842 
843         /* Move to connecting socket, start sending Connect Requests */
844         sock->state = SS_CONNECTING;
845         sk->sk_state = CAIF_CONNECTING;
846 
847         /* Check priority value comming from socket */
848         /* if priority value is out of range it will be ajusted */
849         if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX)
850                 cf_sk->conn_req.priority = CAIF_PRIO_MAX;
851         else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN)
852                 cf_sk->conn_req.priority = CAIF_PRIO_MIN;
853         else
854                 cf_sk->conn_req.priority = cf_sk->sk.sk_priority;
855 
856         /*ifindex = id of the interface.*/
857         cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if;
858 
859         dbfs_atomic_inc(&cnt.num_connect_req);
860         cf_sk->layer.receive = caif_sktrecv_cb;
861 
862         err = caif_connect_client(sock_net(sk), &cf_sk->conn_req,
863                                 &cf_sk->layer, &ifindex, &headroom, &tailroom);
864 
865         if (err < 0) {
866                 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
867                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
868                 goto out;
869         }
870 
871         err = -ENODEV;
872         rcu_read_lock();
873         dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
874         if (!dev) {
875                 rcu_read_unlock();
876                 goto out;
877         }
878         cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom);
879         mtu = dev->mtu;
880         rcu_read_unlock();
881 
882         cf_sk->tailroom = tailroom;
883         cf_sk->maxframe = mtu - (headroom + tailroom);
884         if (cf_sk->maxframe < 1) {
885                 pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu);
886                 err = -ENODEV;
887                 goto out;
888         }
889 
890         err = -EINPROGRESS;
891 wait_connect:
892 
893         if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
894                 goto out;
895 
896         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
897 
898         release_sock(sk);
899         err = -ERESTARTSYS;
900         timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
901                         sk->sk_state != CAIF_CONNECTING,
902                         timeo);
903         lock_sock(sk);
904         if (timeo < 0)
905                 goto out; /* -ERESTARTSYS */
906 
907         err = -ETIMEDOUT;
908         if (timeo == 0 && sk->sk_state != CAIF_CONNECTED)
909                 goto out;
910         if (sk->sk_state != CAIF_CONNECTED) {
911                 sock->state = SS_UNCONNECTED;
912                 err = sock_error(sk);
913                 if (!err)
914                         err = -ECONNREFUSED;
915                 goto out;
916         }
917         sock->state = SS_CONNECTED;
918         err = 0;
919 out:
920         release_sock(sk);
921         return err;
922 }
923 
924 /*
925  * caif_release() - Disconnect a CAIF Socket
926  * Copied and modified af_irda.c:irda_release().
927  */
928 static int caif_release(struct socket *sock)
929 {
930         struct sock *sk = sock->sk;
931         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
932 
933         if (!sk)
934                 return 0;
935 
936         set_tx_flow_off(cf_sk);
937 
938         /*
939          * Ensure that packets are not queued after this point in time.
940          * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
941          * this ensures no packets when sock is dead.
942          */
943         spin_lock_bh(&sk->sk_receive_queue.lock);
944         sock_set_flag(sk, SOCK_DEAD);
945         spin_unlock_bh(&sk->sk_receive_queue.lock);
946         sock->sk = NULL;
947 
948         dbfs_atomic_inc(&cnt.num_disconnect);
949 
950         WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir));
951         if (cf_sk->debugfs_socket_dir != NULL)
952                 debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
953 
954         lock_sock(&(cf_sk->sk));
955         sk->sk_state = CAIF_DISCONNECTED;
956         sk->sk_shutdown = SHUTDOWN_MASK;
957 
958         caif_disconnect_client(sock_net(sk), &cf_sk->layer);
959         cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
960         wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
961 
962         sock_orphan(sk);
963         sk_stream_kill_queues(&cf_sk->sk);
964         release_sock(sk);
965         sock_put(sk);
966         return 0;
967 }
968 
969 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
970 static unsigned int caif_poll(struct file *file,
971                                 struct socket *sock, poll_table *wait)
972 {
973         struct sock *sk = sock->sk;
974         unsigned int mask;
975         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
976 
977         sock_poll_wait(file, sk_sleep(sk), wait);
978         mask = 0;
979 
980         /* exceptional events? */
981         if (sk->sk_err)
982                 mask |= POLLERR;
983         if (sk->sk_shutdown == SHUTDOWN_MASK)
984                 mask |= POLLHUP;
985         if (sk->sk_shutdown & RCV_SHUTDOWN)
986                 mask |= POLLRDHUP;
987 
988         /* readable? */
989         if (!skb_queue_empty(&sk->sk_receive_queue) ||
990                 (sk->sk_shutdown & RCV_SHUTDOWN))
991                 mask |= POLLIN | POLLRDNORM;
992 
993         /*
994          * we set writable also when the other side has shut down the
995          * connection. This prevents stuck sockets.
996          */
997         if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
998                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
999 
1000         return mask;
1001 }
1002 
1003 static const struct proto_ops caif_seqpacket_ops = {
1004         .family = PF_CAIF,
1005         .owner = THIS_MODULE,
1006         .release = caif_release,
1007         .bind = sock_no_bind,
1008         .connect = caif_connect,
1009         .socketpair = sock_no_socketpair,
1010         .accept = sock_no_accept,
1011         .getname = sock_no_getname,
1012         .poll = caif_poll,
1013         .ioctl = sock_no_ioctl,
1014         .listen = sock_no_listen,
1015         .shutdown = sock_no_shutdown,
1016         .setsockopt = setsockopt,
1017         .getsockopt = sock_no_getsockopt,
1018         .sendmsg = caif_seqpkt_sendmsg,
1019         .recvmsg = caif_seqpkt_recvmsg,
1020         .mmap = sock_no_mmap,
1021         .sendpage = sock_no_sendpage,
1022 };
1023 
1024 static const struct proto_ops caif_stream_ops = {
1025         .family = PF_CAIF,
1026         .owner = THIS_MODULE,
1027         .release = caif_release,
1028         .bind = sock_no_bind,
1029         .connect = caif_connect,
1030         .socketpair = sock_no_socketpair,
1031         .accept = sock_no_accept,
1032         .getname = sock_no_getname,
1033         .poll = caif_poll,
1034         .ioctl = sock_no_ioctl,
1035         .listen = sock_no_listen,
1036         .shutdown = sock_no_shutdown,
1037         .setsockopt = setsockopt,
1038         .getsockopt = sock_no_getsockopt,
1039         .sendmsg = caif_stream_sendmsg,
1040         .recvmsg = caif_stream_recvmsg,
1041         .mmap = sock_no_mmap,
1042         .sendpage = sock_no_sendpage,
1043 };
1044 
1045 /* This function is called when a socket is finally destroyed. */
1046 static void caif_sock_destructor(struct sock *sk)
1047 {
1048         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1049         caif_assert(!atomic_read(&sk->sk_wmem_alloc));
1050         caif_assert(sk_unhashed(sk));
1051         caif_assert(!sk->sk_socket);
1052         if (!sock_flag(sk, SOCK_DEAD)) {
1053                 pr_debug("Attempt to release alive CAIF socket: %p\n", sk);
1054                 return;
1055         }
1056         sk_stream_kill_queues(&cf_sk->sk);
1057         dbfs_atomic_dec(&cnt.caif_nr_socks);
1058         caif_free_client(&cf_sk->layer);
1059 }
1060 
1061 static int caif_create(struct net *net, struct socket *sock, int protocol,
1062                         int kern)
1063 {
1064         int num;
1065         struct sock *sk = NULL;
1066         struct caifsock *cf_sk = NULL;
1067         static struct proto prot = {.name = "PF_CAIF",
1068                 .owner = THIS_MODULE,
1069                 .obj_size = sizeof(struct caifsock),
1070         };
1071 
1072         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
1073                 return -EPERM;
1074         /*
1075          * The sock->type specifies the socket type to use.
1076          * The CAIF socket is a packet stream in the sense
1077          * that it is packet based. CAIF trusts the reliability
1078          * of the link, no resending is implemented.
1079          */
1080         if (sock->type == SOCK_SEQPACKET)
1081                 sock->ops = &caif_seqpacket_ops;
1082         else if (sock->type == SOCK_STREAM)
1083                 sock->ops = &caif_stream_ops;
1084         else
1085                 return -ESOCKTNOSUPPORT;
1086 
1087         if (protocol < 0 || protocol >= CAIFPROTO_MAX)
1088                 return -EPROTONOSUPPORT;
1089         /*
1090          * Set the socket state to unconnected.  The socket state
1091          * is really not used at all in the net/core or socket.c but the
1092          * initialization makes sure that sock->state is not uninitialized.
1093          */
1094         sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
1095         if (!sk)
1096                 return -ENOMEM;
1097 
1098         cf_sk = container_of(sk, struct caifsock, sk);
1099 
1100         /* Store the protocol */
1101         sk->sk_protocol = (unsigned char) protocol;
1102 
1103         /*
1104          * Lock in order to try to stop someone from opening the socket
1105          * too early.
1106          */
1107         lock_sock(&(cf_sk->sk));
1108 
1109         /* Initialize the nozero default sock structure data. */
1110         sock_init_data(sock, sk);
1111         sk->sk_destruct = caif_sock_destructor;
1112 
1113         mutex_init(&cf_sk->readlock); /* single task reading lock */
1114         cf_sk->layer.ctrlcmd = caif_ctrl_cb;
1115         cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
1116         cf_sk->sk.sk_state = CAIF_DISCONNECTED;
1117 
1118         set_tx_flow_off(cf_sk);
1119         set_rx_flow_on(cf_sk);
1120 
1121         /* Set default options on configuration */
1122         cf_sk->sk.sk_priority = CAIF_PRIO_NORMAL;
1123         cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
1124         cf_sk->conn_req.protocol = protocol;
1125         /* Increase the number of sockets created. */
1126         dbfs_atomic_inc(&cnt.caif_nr_socks);
1127         num = dbfs_atomic_inc(&cnt.caif_sock_create);
1128 #ifdef CONFIG_DEBUG_FS
1129         if (!IS_ERR(debugfsdir)) {
1130 
1131                 /* Fill in some information concerning the misc socket. */
1132                 snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d", num);
1133 
1134                 cf_sk->debugfs_socket_dir =
1135                         debugfs_create_dir(cf_sk->name, debugfsdir);
1136 
1137                 debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
1138                                 cf_sk->debugfs_socket_dir,
1139                                 (u32 *) &cf_sk->sk.sk_state);
1140                 debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
1141                                 cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
1142                 debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
1143                                 cf_sk->debugfs_socket_dir,
1144                                 (u32 *) &cf_sk->sk.sk_rmem_alloc);
1145                 debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
1146                                 cf_sk->debugfs_socket_dir,
1147                                 (u32 *) &cf_sk->sk.sk_wmem_alloc);
1148                 debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
1149                                 cf_sk->debugfs_socket_dir,
1150                                 (u32 *) &cf_sk->layer.id);
1151         }
1152 #endif
1153         release_sock(&cf_sk->sk);
1154         return 0;
1155 }
1156 
1157 
1158 static struct net_proto_family caif_family_ops = {
1159         .family = PF_CAIF,
1160         .create = caif_create,
1161         .owner = THIS_MODULE,
1162 };
1163 
1164 static int af_caif_init(void)
1165 {
1166         int err = sock_register(&caif_family_ops);
1167         if (!err)
1168                 return err;
1169         return 0;
1170 }
1171 
1172 static int __init caif_sktinit_module(void)
1173 {
1174 #ifdef CONFIG_DEBUG_FS
1175         debugfsdir = debugfs_create_dir("caif_sk", NULL);
1176         if (!IS_ERR(debugfsdir)) {
1177                 debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
1178                                 debugfsdir,
1179                                 (u32 *) &cnt.caif_nr_socks);
1180                 debugfs_create_u32("num_create", S_IRUSR | S_IWUSR,
1181                                 debugfsdir,
1182                                 (u32 *) &cnt.caif_sock_create);
1183                 debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
1184                                 debugfsdir,
1185                                 (u32 *) &cnt.num_connect_req);
1186                 debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
1187                                 debugfsdir,
1188                                 (u32 *) &cnt.num_connect_resp);
1189                 debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
1190                                 debugfsdir,
1191                                 (u32 *) &cnt.num_connect_fail_resp);
1192                 debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
1193                                 debugfsdir,
1194                                 (u32 *) &cnt.num_disconnect);
1195                 debugfs_create_u32("num_remote_shutdown_ind",
1196                                 S_IRUSR | S_IWUSR, debugfsdir,
1197                                 (u32 *) &cnt.num_remote_shutdown_ind);
1198                 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
1199                                 debugfsdir,
1200                                 (u32 *) &cnt.num_tx_flow_off_ind);
1201                 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
1202                                 debugfsdir,
1203                                 (u32 *) &cnt.num_tx_flow_on_ind);
1204                 debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
1205                                 debugfsdir,
1206                                 (u32 *) &cnt.num_rx_flow_off);
1207                 debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
1208                                 debugfsdir,
1209                                 (u32 *) &cnt.num_rx_flow_on);
1210         }
1211 #endif
1212         return af_caif_init();
1213 }
1214 
1215 static void __exit caif_sktexit_module(void)
1216 {
1217         sock_unregister(PF_CAIF);
1218         if (debugfsdir != NULL)
1219                 debugfs_remove_recursive(debugfsdir);
1220 }
1221 module_init(caif_sktinit_module);
1222 module_exit(caif_sktexit_module);
1223 

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