net/caif/caif_socket.c

   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 (CAIF_MAX_PAYLOAD_SIZE*10)
  32 #define CAIF_DEF_RCVBUF (CAIF_MAX_PAYLOAD_SIZE*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 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 };
  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 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 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)
 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 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                 trace_printk("CAIF: %s():"
 160                         " sending flow OFF (queue len = %d %d)\n",
 161                         __func__,
 162                         atomic_read(&cf_sk->sk.sk_rmem_alloc),
 163                         sk_rcvbuf_lowwater(cf_sk));
 164                 set_rx_flow_off(cf_sk);
 165                 if (cf_sk->layer.dn)
 166                         cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
 167                                                 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                 if (cf_sk->layer.dn)
 179                         cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
 180                                                 CAIF_MODEMCMD_FLOW_OFF_REQ);
 181         }
 182         skb->dev = NULL;
 183         skb_set_owner_r(skb, sk);
 184         /* Cache the SKB length before we tack it onto the receive
 185          * queue. Once it is added it no longer belongs to us and
 186          * may be freed by other threads of control pulling packets
 187          * from the queue.
 188          */
 189         skb_len = skb->len;
 190         spin_lock_irqsave(&list->lock, flags);
 191         if (!sock_flag(sk, SOCK_DEAD))
 192                 __skb_queue_tail(list, skb);
 193         spin_unlock_irqrestore(&list->lock, flags);
 194
 195         if (!sock_flag(sk, SOCK_DEAD))
 196                 sk->sk_data_ready(sk, skb_len);
 197         else
 198                 kfree_skb(skb);
 199         return 0;
 200 }
 201
 202 /* Packet Receive Callback function called from CAIF Stack */
 203 static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
 204 {
 205         struct caifsock *cf_sk;
 206         struct sk_buff *skb;
 207
 208         cf_sk = container_of(layr, struct caifsock, layer);
 209         skb = cfpkt_tonative(pkt);
 210
 211         if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
 212                 cfpkt_destroy(pkt);
 213                 return 0;
 214         }
 215         caif_queue_rcv_skb(&cf_sk->sk, skb);
 216         return 0;
 217 }
 218
 219 /* Packet Control Callback function called from CAIF */
 220 static void caif_ctrl_cb(struct cflayer *layr,
 221                                 enum caif_ctrlcmd flow,
 222                                 int phyid)
 223 {
 224         struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
 225         switch (flow) {
 226         case CAIF_CTRLCMD_FLOW_ON_IND:
 227                 /* OK from modem to start sending again */
 228                 dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
 229                 set_tx_flow_on(cf_sk);
 230                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 231                 break;
 232
 233         case CAIF_CTRLCMD_FLOW_OFF_IND:
 234                 /* Modem asks us to shut up */
 235                 dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
 236                 set_tx_flow_off(cf_sk);
 237                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 238                 break;
 239
 240         case CAIF_CTRLCMD_INIT_RSP:
 241                 /* We're now connected */
 242                 dbfs_atomic_inc(&cnt.num_connect_resp);
 243                 cf_sk->sk.sk_state = CAIF_CONNECTED;
 244                 set_tx_flow_on(cf_sk);
 245                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 246                 break;
 247
 248         case CAIF_CTRLCMD_DEINIT_RSP:
 249                 /* We're now disconnected */
 250                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
 251                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 252                 cfcnfg_release_adap_layer(&cf_sk->layer);
 253                 break;
 254
 255         case CAIF_CTRLCMD_INIT_FAIL_RSP:
 256                 /* Connect request failed */
 257                 dbfs_atomic_inc(&cnt.num_connect_fail_resp);
 258                 cf_sk->sk.sk_err = ECONNREFUSED;
 259                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
 260                 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
 261                 /*
 262                  * Socket "standards" seems to require POLLOUT to
 263                  * be set at connect failure.
 264                  */
 265                 set_tx_flow_on(cf_sk);
 266                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 267                 break;
 268
 269         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
 270                 /* Modem has closed this connection, or device is down. */
 271                 dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
 272                 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
 273                 cf_sk->sk.sk_err = ECONNRESET;
 274                 set_rx_flow_on(cf_sk);
 275                 cf_sk->sk.sk_error_report(&cf_sk->sk);
 276                 break;
 277
 278         default:
 279                 pr_debug("CAIF: %s(): Unexpected flow command %d\n",
 280                                 __func__, flow);
 281         }
 282 }
 283
 284 static void caif_check_flow_release(struct sock *sk)
 285 {
 286         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 287
 288         if (cf_sk->layer.dn == NULL || cf_sk->layer.dn->modemcmd == NULL)
 289                 return;
 290         if (rx_flow_is_on(cf_sk))
 291                 return;
 292
 293         if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
 294                         dbfs_atomic_inc(&cnt.num_rx_flow_on);
 295                         set_rx_flow_on(cf_sk);
 296                         cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
 297                                                 CAIF_MODEMCMD_FLOW_ON_REQ);
 298         }
 299 }
 300 /*
 301  * Copied from sock.c:sock_queue_rcv_skb(), and added check that user buffer
 302  * has sufficient size.
 303  */
 304
 305 static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
 306                                 struct msghdr *m, size_t buf_len, int flags)
 307
 308 {
 309         struct sock *sk = sock->sk;
 310         struct sk_buff *skb;
 311         int ret = 0;
 312         int len;
 313
 314         if (unlikely(!buf_len))
 315                 return -EINVAL;
 316
 317         skb = skb_recv_datagram(sk, flags, 0 , &ret);
 318         if (!skb)
 319                 goto read_error;
 320
 321         len = skb->len;
 322
 323         if (skb && skb->len > buf_len && !(flags & MSG_PEEK)) {
 324                 len = buf_len;
 325                 /*
 326                  * Push skb back on receive queue if buffer too small.
 327                  * This has a built-in race where multi-threaded receive
 328                  * may get packet in wrong order, but multiple read does
 329                  * not really guarantee ordered delivery anyway.
 330                  * Let's optimize for speed without taking locks.
 331                  */
 332
 333                 skb_queue_head(&sk->sk_receive_queue, skb);
 334                 ret = -EMSGSIZE;
 335                 goto read_error;
 336         }
 337
 338         ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, len);
 339         if (ret)
 340                 goto read_error;
 341
 342         skb_free_datagram(sk, skb);
 343
 344         caif_check_flow_release(sk);
 345
 346         return len;
 347
 348 read_error:
 349         return ret;
 350 }
 351
 352
 353 /* Copied from unix_stream_wait_data, identical except for lock call. */
 354 static long caif_stream_data_wait(struct sock *sk, long timeo)
 355 {
 356         DEFINE_WAIT(wait);
 357         lock_sock(sk);
 358
 359         for (;;) {
 360                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 361
 362                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
 363                         sk->sk_err ||
 364                         sk->sk_state != CAIF_CONNECTED ||
 365                         sock_flag(sk, SOCK_DEAD) ||
 366                         (sk->sk_shutdown & RCV_SHUTDOWN) ||
 367                         signal_pending(current) ||
 368                         !timeo)
 369                         break;
 370
 371                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 372                 release_sock(sk);
 373                 timeo = schedule_timeout(timeo);
 374                 lock_sock(sk);
 375                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 376         }
 377
 378         finish_wait(sk_sleep(sk), &wait);
 379         release_sock(sk);
 380         return timeo;
 381 }
 382
 383
 384 /*
 385  * Copied from unix_stream_recvmsg, but removed credit checks,
 386  * changed locking calls, changed address handling.
 387  */
 388 static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
 389                                 struct msghdr *msg, size_t size,
 390                                 int flags)
 391 {
 392         struct sock *sk = sock->sk;
 393         int copied = 0;
 394         int target;
 395         int err = 0;
 396         long timeo;
 397
 398         err = -EOPNOTSUPP;
 399         if (flags&MSG_OOB)
 400                 goto out;
 401
 402         msg->msg_namelen = 0;
 403
 404         /*
 405          * Lock the socket to prevent queue disordering
 406          * while sleeps in memcpy_tomsg
 407          */
 408         err = -EAGAIN;
 409         if (sk->sk_state == CAIF_CONNECTING)
 410                 goto out;
 411
 412         caif_read_lock(sk);
 413         target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
 414         timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
 415
 416         do {
 417                 int chunk;
 418                 struct sk_buff *skb;
 419
 420                 lock_sock(sk);
 421                 skb = skb_dequeue(&sk->sk_receive_queue);
 422                 caif_check_flow_release(sk);
 423
 424                 if (skb == NULL) {
 425                         if (copied >= target)
 426                                 goto unlock;
 427                         /*
 428                          *      POSIX 1003.1g mandates this order.
 429                          */
 430                         err = sock_error(sk);
 431                         if (err)
 432                                 goto unlock;
 433                         err = -ECONNRESET;
 434                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 435                                 goto unlock;
 436
 437                         err = -EPIPE;
 438                         if (sk->sk_state != CAIF_CONNECTED)
 439                                 goto unlock;
 440                         if (sock_flag(sk, SOCK_DEAD))
 441                                 goto unlock;
 442
 443                         release_sock(sk);
 444
 445                         err = -EAGAIN;
 446                         if (!timeo)
 447                                 break;
 448
 449                         caif_read_unlock(sk);
 450
 451                         timeo = caif_stream_data_wait(sk, timeo);
 452
 453                         if (signal_pending(current)) {
 454                                 err = sock_intr_errno(timeo);
 455                                 goto out;
 456                         }
 457                         caif_read_lock(sk);
 458                         continue;
 459 unlock:
 460                         release_sock(sk);
 461                         break;
 462                 }
 463                 release_sock(sk);
 464                 chunk = min_t(unsigned int, skb->len, size);
 465                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
 466                         skb_queue_head(&sk->sk_receive_queue, skb);
 467                         if (copied == 0)
 468                                 copied = -EFAULT;
 469                         break;
 470                 }
 471                 copied += chunk;
 472                 size -= chunk;
 473
 474                 /* Mark read part of skb as used */
 475                 if (!(flags & MSG_PEEK)) {
 476                         skb_pull(skb, chunk);
 477
 478                         /* put the skb back if we didn't use it up. */
 479                         if (skb->len) {
 480                                 skb_queue_head(&sk->sk_receive_queue, skb);
 481                                 break;
 482                         }
 483                         kfree_skb(skb);
 484
 485                 } else {
 486                         /*
 487                          * It is questionable, see note in unix_dgram_recvmsg.
 488                          */
 489                         /* put message back and return */
 490                         skb_queue_head(&sk->sk_receive_queue, skb);
 491                         break;
 492                 }
 493         } while (size);
 494         caif_read_unlock(sk);
 495
 496 out:
 497         return copied ? : err;
 498 }
 499
 500 /*
 501  * Copied from sock.c:sock_wait_for_wmem, but change to wait for
 502  * CAIF flow-on and sock_writable.
 503  */
 504 static long caif_wait_for_flow_on(struct caifsock *cf_sk,
 505                                 int wait_writeable, long timeo, int *err)
 506 {
 507         struct sock *sk = &cf_sk->sk;
 508         DEFINE_WAIT(wait);
 509         for (;;) {
 510                 *err = 0;
 511                 if (tx_flow_is_on(cf_sk) &&
 512                         (!wait_writeable || sock_writeable(&cf_sk->sk)))
 513                         break;
 514                 *err = -ETIMEDOUT;
 515                 if (!timeo)
 516                         break;
 517                 *err = -ERESTARTSYS;
 518                 if (signal_pending(current))
 519                         break;
 520                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 521                 *err = -ECONNRESET;
 522                 if (sk->sk_shutdown & SHUTDOWN_MASK)
 523                         break;
 524                 *err = -sk->sk_err;
 525                 if (sk->sk_err)
 526                         break;
 527                 *err = -EPIPE;
 528                 if (cf_sk->sk.sk_state != CAIF_CONNECTED)
 529                         break;
 530                 timeo = schedule_timeout(timeo);
 531         }
 532         finish_wait(sk_sleep(sk), &wait);
 533         return timeo;
 534 }
 535
 536 /*
 537  * Transmit a SKB. The device may temporarily request re-transmission
 538  * by returning EAGAIN.
 539  */
 540 static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk,
 541                         int noblock, long timeo)
 542 {
 543         struct cfpkt *pkt;
 544         int ret, loopcnt = 0;
 545
 546         pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
 547         memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info));
 548         do {
 549
 550                 ret = -ETIMEDOUT;
 551
 552                 /* Slight paranoia, probably not needed. */
 553                 if (unlikely(loopcnt++ > 1000)) {
 554                         pr_warning("CAIF: %s(): transmit retries failed,"
 555                                 " error = %d\n", __func__, ret);
 556                         break;
 557                 }
 558
 559                 if (cf_sk->layer.dn != NULL)
 560                         ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
 561                 if (likely(ret >= 0))
 562                         break;
 563                 /* if transmit return -EAGAIN, then retry */
 564                 if (noblock && ret == -EAGAIN)
 565                         break;
 566                 timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret);
 567                 if (signal_pending(current)) {
 568                         ret = sock_intr_errno(timeo);
 569                         break;
 570                 }
 571                 if (ret)
 572                         break;
 573                 if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
 574                         sock_flag(&cf_sk->sk, SOCK_DEAD) ||
 575                         (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) {
 576                         ret = -EPIPE;
 577                         cf_sk->sk.sk_err = EPIPE;
 578                         break;
 579                 }
 580         } while (ret == -EAGAIN);
 581         return ret;
 582 }
 583
 584 /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
 585 static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock,
 586                         struct msghdr *msg, size_t len)
 587 {
 588         struct sock *sk = sock->sk;
 589         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 590         int buffer_size;
 591         int ret = 0;
 592         struct sk_buff *skb = NULL;
 593         int noblock;
 594         long timeo;
 595         caif_assert(cf_sk);
 596         ret = sock_error(sk);
 597         if (ret)
 598                 goto err;
 599
 600         ret = -EOPNOTSUPP;
 601         if (msg->msg_flags&MSG_OOB)
 602                 goto err;
 603
 604         ret = -EOPNOTSUPP;
 605         if (msg->msg_namelen)
 606                 goto err;
 607
 608         ret = -EINVAL;
 609         if (unlikely(msg->msg_iov->iov_base == NULL))
 610                 goto err;
 611         noblock = msg->msg_flags & MSG_DONTWAIT;
 612
 613         buffer_size = len + CAIF_NEEDED_HEADROOM + CAIF_NEEDED_TAILROOM;
 614
 615         ret = -EMSGSIZE;
 616         if (buffer_size > CAIF_MAX_PAYLOAD_SIZE)
 617                 goto err;
 618
 619         timeo = sock_sndtimeo(sk, noblock);
 620         timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
 621                                 1, timeo, &ret);
 622
 623         ret = -EPIPE;
 624         if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
 625                 sock_flag(sk, SOCK_DEAD) ||
 626                 (sk->sk_shutdown & RCV_SHUTDOWN))
 627                 goto err;
 628
 629         ret = -ENOMEM;
 630         skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
 631         if (!skb)
 632                 goto err;
 633         skb_reserve(skb, CAIF_NEEDED_HEADROOM);
 634
 635         ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
 636
 637         if (ret)
 638                 goto err;
 639         ret = transmit_skb(skb, cf_sk, noblock, timeo);
 640         if (ret < 0)
 641                 goto err;
 642         return len;
 643 err:
 644         kfree_skb(skb);
 645         return ret;
 646 }
 647
 648 /*
 649  * Copied from unix_stream_sendmsg and adapted to CAIF:
 650  * Changed removed permission handling and added waiting for flow on
 651  * and other minor adaptations.
 652  */
 653 static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
 654                                 struct msghdr *msg, size_t len)
 655 {
 656         struct sock *sk = sock->sk;
 657         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 658         int err, size;
 659         struct sk_buff *skb;
 660         int sent = 0;
 661         long timeo;
 662
 663         err = -EOPNOTSUPP;
 664
 665         if (unlikely(msg->msg_flags&MSG_OOB))
 666                 goto out_err;
 667
 668         if (unlikely(msg->msg_namelen))
 669                 goto out_err;
 670
 671         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 672         timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err);
 673
 674         if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN))
 675                 goto pipe_err;
 676
 677         while (sent < len) {
 678
 679                 size = len-sent;
 680
 681                 if (size > CAIF_MAX_PAYLOAD_SIZE)
 682                         size = CAIF_MAX_PAYLOAD_SIZE;
 683
 684                 /* If size is more than half of sndbuf, chop up message */
 685                 if (size > ((sk->sk_sndbuf >> 1) - 64))
 686                         size = (sk->sk_sndbuf >> 1) - 64;
 687
 688                 if (size > SKB_MAX_ALLOC)
 689                         size = SKB_MAX_ALLOC;
 690
 691                 skb = sock_alloc_send_skb(sk,
 692                                         size + CAIF_NEEDED_HEADROOM
 693                                         + CAIF_NEEDED_TAILROOM,
 694                                         msg->msg_flags&MSG_DONTWAIT,
 695                                         &err);
 696                 if (skb == NULL)
 697                         goto out_err;
 698
 699                 skb_reserve(skb, CAIF_NEEDED_HEADROOM);
 700                 /*
 701                  *      If you pass two values to the sock_alloc_send_skb
 702                  *      it tries to grab the large buffer with GFP_NOFS
 703                  *      (which can fail easily), and if it fails grab the
 704                  *      fallback size buffer which is under a page and will
 705                  *      succeed. [Alan]
 706                  */
 707                 size = min_t(int, size, skb_tailroom(skb));
 708
 709                 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 710                 if (err) {
 711                         kfree_skb(skb);
 712                         goto out_err;
 713                 }
 714                 err = transmit_skb(skb, cf_sk,
 715                                 msg->msg_flags&MSG_DONTWAIT, timeo);
 716                 if (err < 0) {
 717                         kfree_skb(skb);
 718                         goto pipe_err;
 719                 }
 720                 sent += size;
 721         }
 722
 723         return sent;
 724
 725 pipe_err:
 726         if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
 727                 send_sig(SIGPIPE, current, 0);
 728         err = -EPIPE;
 729 out_err:
 730         return sent ? : err;
 731 }
 732
 733 static int setsockopt(struct socket *sock,
 734                         int lvl, int opt, char __user *ov, unsigned int ol)
 735 {
 736         struct sock *sk = sock->sk;
 737         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 738         int prio, linksel;
 739         struct ifreq ifreq;
 740
 741         if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
 742                 return -ENOPROTOOPT;
 743
 744         switch (opt) {
 745         case CAIFSO_LINK_SELECT:
 746                 if (ol < sizeof(int))
 747                         return -EINVAL;
 748                 if (lvl != SOL_CAIF)
 749                         goto bad_sol;
 750                 if (copy_from_user(&linksel, ov, sizeof(int)))
 751                         return -EINVAL;
 752                 lock_sock(&(cf_sk->sk));
 753                 cf_sk->conn_req.link_selector = linksel;
 754                 release_sock(&cf_sk->sk);
 755                 return 0;
 756
 757         case SO_PRIORITY:
 758                 if (lvl != SOL_SOCKET)
 759                         goto bad_sol;
 760                 if (ol < sizeof(int))
 761                         return -EINVAL;
 762                 if (copy_from_user(&prio, ov, sizeof(int)))
 763                         return -EINVAL;
 764                 lock_sock(&(cf_sk->sk));
 765                 cf_sk->conn_req.priority = prio;
 766                 release_sock(&cf_sk->sk);
 767                 return 0;
 768
 769         case SO_BINDTODEVICE:
 770                 if (lvl != SOL_SOCKET)
 771                         goto bad_sol;
 772                 if (ol < sizeof(struct ifreq))
 773                         return -EINVAL;
 774                 if (copy_from_user(&ifreq, ov, sizeof(ifreq)))
 775                         return -EFAULT;
 776                 lock_sock(&(cf_sk->sk));
 777                 strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name,
 778                         sizeof(cf_sk->conn_req.link_name));
 779                 cf_sk->conn_req.link_name
 780                         [sizeof(cf_sk->conn_req.link_name)-1] = 0;
 781                 release_sock(&cf_sk->sk);
 782                 return 0;
 783
 784         case CAIFSO_REQ_PARAM:
 785                 if (lvl != SOL_CAIF)
 786                         goto bad_sol;
 787                 if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL)
 788                         return -ENOPROTOOPT;
 789                 lock_sock(&(cf_sk->sk));
 790                 cf_sk->conn_req.param.size = ol;
 791                 if (ol > sizeof(cf_sk->conn_req.param.data) ||
 792                         copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
 793                         release_sock(&cf_sk->sk);
 794                         return -EINVAL;
 795                 }
 796                 release_sock(&cf_sk->sk);
 797                 return 0;
 798
 799         default:
 800                 return -ENOPROTOOPT;
 801         }
 802
 803         return 0;
 804 bad_sol:
 805         return -ENOPROTOOPT;
 806
 807 }
 808
 809 /*
 810  * caif_connect() - Connect a CAIF Socket
 811  * Copied and modified af_irda.c:irda_connect().
 812  *
 813  * Note : by consulting "errno", the user space caller may learn the cause
 814  * of the failure. Most of them are visible in the function, others may come
 815  * from subroutines called and are listed here :
 816  *  o -EAFNOSUPPORT: bad socket family or type.
 817  *  o -ESOCKTNOSUPPORT: bad socket type or protocol
 818  *  o -EINVAL: bad socket address, or CAIF link type
 819  *  o -ECONNREFUSED: remote end refused the connection.
 820  *  o -EINPROGRESS: connect request sent but timed out (or non-blocking)
 821  *  o -EISCONN: already connected.
 822  *  o -ETIMEDOUT: Connection timed out (send timeout)
 823  *  o -ENODEV: No link layer to send request
 824  *  o -ECONNRESET: Received Shutdown indication or lost link layer
 825  *  o -ENOMEM: Out of memory
 826  *
 827  *  State Strategy:
 828  *  o sk_state: holds the CAIF_* protocol state, it's updated by
 829  *      caif_ctrl_cb.
 830  *  o sock->state: holds the SS_* socket state and is updated by connect and
 831  *      disconnect.
 832  */
 833 static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
 834                         int addr_len, int flags)
 835 {
 836         struct sock *sk = sock->sk;
 837         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 838         long timeo;
 839         int err;
 840         lock_sock(sk);
 841
 842         err = -EAFNOSUPPORT;
 843         if (uaddr->sa_family != AF_CAIF)
 844                 goto out;
 845
 846         err = -ESOCKTNOSUPPORT;
 847         if (unlikely(!(sk->sk_type == SOCK_STREAM &&
 848                        cf_sk->sk.sk_protocol == CAIFPROTO_AT) &&
 849                        sk->sk_type != SOCK_SEQPACKET))
 850                 goto out;
 851         switch (sock->state) {
 852         case SS_UNCONNECTED:
 853                 /* Normal case, a fresh connect */
 854                 caif_assert(sk->sk_state == CAIF_DISCONNECTED);
 855                 break;
 856         case SS_CONNECTING:
 857                 switch (sk->sk_state) {
 858                 case CAIF_CONNECTED:
 859                         sock->state = SS_CONNECTED;
 860                         err = -EISCONN;
 861                         goto out;
 862                 case CAIF_DISCONNECTED:
 863                         /* Reconnect allowed */
 864                         break;
 865                 case CAIF_CONNECTING:
 866                         err = -EALREADY;
 867                         if (flags & O_NONBLOCK)
 868                                 goto out;
 869                         goto wait_connect;
 870                 }
 871                 break;
 872         case SS_CONNECTED:
 873                 caif_assert(sk->sk_state == CAIF_CONNECTED ||
 874                                 sk->sk_state == CAIF_DISCONNECTED);
 875                 if (sk->sk_shutdown & SHUTDOWN_MASK) {
 876                         /* Allow re-connect after SHUTDOWN_IND */
 877                         caif_disconnect_client(&cf_sk->layer);
 878                         break;
 879                 }
 880                 /* No reconnect on a seqpacket socket */
 881                 err = -EISCONN;
 882                 goto out;
 883         case SS_DISCONNECTING:
 884         case SS_FREE:
 885                 caif_assert(1); /*Should never happen */
 886                 break;
 887         }
 888         sk->sk_state = CAIF_DISCONNECTED;
 889         sock->state = SS_UNCONNECTED;
 890         sk_stream_kill_queues(&cf_sk->sk);
 891
 892         err = -EINVAL;
 893         if (addr_len != sizeof(struct sockaddr_caif) ||
 894                 !uaddr)
 895                 goto out;
 896
 897         memcpy(&cf_sk->conn_req.sockaddr, uaddr,
 898                 sizeof(struct sockaddr_caif));
 899
 900         /* Move to connecting socket, start sending Connect Requests */
 901         sock->state = SS_CONNECTING;
 902         sk->sk_state = CAIF_CONNECTING;
 903
 904         dbfs_atomic_inc(&cnt.num_connect_req);
 905         cf_sk->layer.receive = caif_sktrecv_cb;
 906         err = caif_connect_client(&cf_sk->conn_req,
 907                                 &cf_sk->layer);
 908         if (err < 0) {
 909                 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
 910                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
 911                 goto out;
 912         }
 913
 914         err = -EINPROGRESS;
 915 wait_connect:
 916
 917         if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
 918                 goto out;
 919
 920         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 921
 922         release_sock(sk);
 923         err = wait_event_interruptible_timeout(*sk_sleep(sk),
 924                         sk->sk_state != CAIF_CONNECTING,
 925                         timeo);
 926         lock_sock(sk);
 927         if (err < 0)
 928                 goto out; /* -ERESTARTSYS */
 929         if (err == 0 && sk->sk_state != CAIF_CONNECTED) {
 930                 err = -ETIMEDOUT;
 931                 goto out;
 932         }
 933
 934         if (sk->sk_state != CAIF_CONNECTED) {
 935                 sock->state = SS_UNCONNECTED;
 936                 err = sock_error(sk);
 937                 if (!err)
 938                         err = -ECONNREFUSED;
 939                 goto out;
 940         }
 941         sock->state = SS_CONNECTED;
 942         err = 0;
 943 out:
 944         release_sock(sk);
 945         return err;
 946 }
 947
 948
 949 /*
 950  * caif_release() - Disconnect a CAIF Socket
 951  * Copied and modified af_irda.c:irda_release().
 952  */
 953 static int caif_release(struct socket *sock)
 954 {
 955         struct sock *sk = sock->sk;
 956         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 957         int res = 0;
 958
 959         if (!sk)
 960                 return 0;
 961
 962         set_tx_flow_off(cf_sk);
 963
 964         /*
 965          * Ensure that packets are not queued after this point in time.
 966          * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
 967          * this ensures no packets when sock is dead.
 968          */
 969         spin_lock(&sk->sk_receive_queue.lock);
 970         sock_set_flag(sk, SOCK_DEAD);
 971         spin_unlock(&sk->sk_receive_queue.lock);
 972         sock->sk = NULL;
 973
 974         dbfs_atomic_inc(&cnt.num_disconnect);
 975
 976         if (cf_sk->debugfs_socket_dir != NULL)
 977                 debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
 978
 979         lock_sock(&(cf_sk->sk));
 980         sk->sk_state = CAIF_DISCONNECTED;
 981         sk->sk_shutdown = SHUTDOWN_MASK;
 982
 983         if (cf_sk->sk.sk_socket->state == SS_CONNECTED ||
 984                 cf_sk->sk.sk_socket->state == SS_CONNECTING)
 985                 res = caif_disconnect_client(&cf_sk->layer);
 986
 987         cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
 988         wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
 989
 990         sock_orphan(sk);
 991         cf_sk->layer.dn = NULL;
 992         sk_stream_kill_queues(&cf_sk->sk);
 993         release_sock(sk);
 994         sock_put(sk);
 995         return res;
 996 }
 997
 998 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
 999 static unsigned int caif_poll(struct file *file,
1000                                 struct socket *sock, poll_table *wait)
1001 {
1002         struct sock *sk = sock->sk;
1003         unsigned int mask;
1004         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1005
1006         sock_poll_wait(file, sk_sleep(sk), wait);
1007         mask = 0;
1008
1009         /* exceptional events? */
1010         if (sk->sk_err)
1011                 mask |= POLLERR;
1012         if (sk->sk_shutdown == SHUTDOWN_MASK)
1013                 mask |= POLLHUP;
1014         if (sk->sk_shutdown & RCV_SHUTDOWN)
1015                 mask |= POLLRDHUP;
1016
1017         /* readable? */
1018         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1019                 (sk->sk_shutdown & RCV_SHUTDOWN))
1020                 mask |= POLLIN | POLLRDNORM;
1021
1022         /* Connection-based need to check for termination and startup */
1023         if (sk->sk_state == CAIF_DISCONNECTED)
1024                 mask |= POLLHUP;
1025
1026         /*
1027          * we set writable also when the other side has shut down the
1028          * connection. This prevents stuck sockets.
1029          */
1030         if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
1031                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1032
1033         return mask;
1034 }
1035
1036 static const struct proto_ops caif_seqpacket_ops = {
1037         .family = PF_CAIF,
1038         .owner = THIS_MODULE,
1039         .release = caif_release,
1040         .bind = sock_no_bind,
1041         .connect = caif_connect,
1042         .socketpair = sock_no_socketpair,
1043         .accept = sock_no_accept,
1044         .getname = sock_no_getname,
1045         .poll = caif_poll,
1046         .ioctl = sock_no_ioctl,
1047         .listen = sock_no_listen,
1048         .shutdown = sock_no_shutdown,
1049         .setsockopt = setsockopt,
1050         .getsockopt = sock_no_getsockopt,
1051         .sendmsg = caif_seqpkt_sendmsg,
1052         .recvmsg = caif_seqpkt_recvmsg,
1053         .mmap = sock_no_mmap,
1054         .sendpage = sock_no_sendpage,
1055 };
1056
1057 static const struct proto_ops caif_stream_ops = {
1058         .family = PF_CAIF,
1059         .owner = THIS_MODULE,
1060         .release = caif_release,
1061         .bind = sock_no_bind,
1062         .connect = caif_connect,
1063         .socketpair = sock_no_socketpair,
1064         .accept = sock_no_accept,
1065         .getname = sock_no_getname,
1066         .poll = caif_poll,
1067         .ioctl = sock_no_ioctl,
1068         .listen = sock_no_listen,
1069         .shutdown = sock_no_shutdown,
1070         .setsockopt = setsockopt,
1071         .getsockopt = sock_no_getsockopt,
1072         .sendmsg = caif_stream_sendmsg,
1073         .recvmsg = caif_stream_recvmsg,
1074         .mmap = sock_no_mmap,
1075         .sendpage = sock_no_sendpage,
1076 };
1077
1078 /* This function is called when a socket is finally destroyed. */
1079 static void caif_sock_destructor(struct sock *sk)
1080 {
1081         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1082         caif_assert(!atomic_read(&sk->sk_wmem_alloc));
1083         caif_assert(sk_unhashed(sk));
1084         caif_assert(!sk->sk_socket);
1085         if (!sock_flag(sk, SOCK_DEAD)) {
1086                 pr_info("Attempt to release alive CAIF socket: %p\n", sk);
1087                 return;
1088         }
1089         sk_stream_kill_queues(&cf_sk->sk);
1090         dbfs_atomic_dec(&cnt.caif_nr_socks);
1091 }
1092
1093 static int caif_create(struct net *net, struct socket *sock, int protocol,
1094                         int kern)
1095 {
1096         struct sock *sk = NULL;
1097         struct caifsock *cf_sk = NULL;
1098         static struct proto prot = {.name = "PF_CAIF",
1099                 .owner = THIS_MODULE,
1100                 .obj_size = sizeof(struct caifsock),
1101         };
1102
1103         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
1104                 return -EPERM;
1105         /*
1106          * The sock->type specifies the socket type to use.
1107          * The CAIF socket is a packet stream in the sense
1108          * that it is packet based. CAIF trusts the reliability
1109          * of the link, no resending is implemented.
1110          */
1111         if (sock->type == SOCK_SEQPACKET)
1112                 sock->ops = &caif_seqpacket_ops;
1113         else if (sock->type == SOCK_STREAM)
1114                 sock->ops = &caif_stream_ops;
1115         else
1116                 return -ESOCKTNOSUPPORT;
1117
1118         if (protocol < 0 || protocol >= CAIFPROTO_MAX)
1119                 return -EPROTONOSUPPORT;
1120         /*
1121          * Set the socket state to unconnected.  The socket state
1122          * is really not used at all in the net/core or socket.c but the
1123          * initialization makes sure that sock->state is not uninitialized.
1124          */
1125         sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
1126         if (!sk)
1127                 return -ENOMEM;
1128
1129         cf_sk = container_of(sk, struct caifsock, sk);
1130
1131         /* Store the protocol */
1132         sk->sk_protocol = (unsigned char) protocol;
1133
1134         /* Sendbuf dictates the amount of outbound packets not yet sent */
1135         sk->sk_sndbuf = CAIF_DEF_SNDBUF;
1136         sk->sk_rcvbuf = CAIF_DEF_RCVBUF;
1137
1138         /*
1139          * Lock in order to try to stop someone from opening the socket
1140          * too early.
1141          */
1142         lock_sock(&(cf_sk->sk));
1143
1144         /* Initialize the nozero default sock structure data. */
1145         sock_init_data(sock, sk);
1146         sk->sk_destruct = caif_sock_destructor;
1147
1148         mutex_init(&cf_sk->readlock); /* single task reading lock */
1149         cf_sk->layer.ctrlcmd = caif_ctrl_cb;
1150         cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
1151         cf_sk->sk.sk_state = CAIF_DISCONNECTED;
1152
1153         set_tx_flow_off(cf_sk);
1154         set_rx_flow_on(cf_sk);
1155
1156         /* Set default options on configuration */
1157         cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
1158         cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
1159         cf_sk->conn_req.protocol = protocol;
1160         /* Increase the number of sockets created. */
1161         dbfs_atomic_inc(&cnt.caif_nr_socks);
1162 #ifdef CONFIG_DEBUG_FS
1163         if (!IS_ERR(debugfsdir)) {
1164                 /* Fill in some information concerning the misc socket. */
1165                 snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
1166                                 atomic_read(&cnt.caif_nr_socks));
1167
1168                 cf_sk->debugfs_socket_dir =
1169                         debugfs_create_dir(cf_sk->name, debugfsdir);
1170                 debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
1171                                 cf_sk->debugfs_socket_dir,
1172                                 (u32 *) &cf_sk->sk.sk_state);
1173                 debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
1174                                 cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
1175                 debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
1176                                 cf_sk->debugfs_socket_dir,
1177                                 (u32 *) &cf_sk->sk.sk_rmem_alloc);
1178                 debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
1179                                 cf_sk->debugfs_socket_dir,
1180                                 (u32 *) &cf_sk->sk.sk_wmem_alloc);
1181                 debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
1182                                 cf_sk->debugfs_socket_dir,
1183                                 (u32 *) &cf_sk->layer.id);
1184         }
1185 #endif
1186         release_sock(&cf_sk->sk);
1187         return 0;
1188 }
1189
1190
1191 static struct net_proto_family caif_family_ops = {
1192         .family = PF_CAIF,
1193         .create = caif_create,
1194         .owner = THIS_MODULE,
1195 };
1196
1197 int af_caif_init(void)
1198 {
1199         int err = sock_register(&caif_family_ops);
1200         if (!err)
1201                 return err;
1202         return 0;
1203 }
1204
1205 static int __init caif_sktinit_module(void)
1206 {
1207 #ifdef CONFIG_DEBUG_FS
1208         debugfsdir = debugfs_create_dir("caif_sk", NULL);
1209         if (!IS_ERR(debugfsdir)) {
1210                 debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
1211                                 debugfsdir,
1212                                 (u32 *) &cnt.caif_nr_socks);
1213                 debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
1214                                 debugfsdir,
1215                                 (u32 *) &cnt.num_connect_req);
1216                 debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
1217                                 debugfsdir,
1218                                 (u32 *) &cnt.num_connect_resp);
1219                 debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
1220                                 debugfsdir,
1221                                 (u32 *) &cnt.num_connect_fail_resp);
1222                 debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
1223                                 debugfsdir,
1224                                 (u32 *) &cnt.num_disconnect);
1225                 debugfs_create_u32("num_remote_shutdown_ind",
1226                                 S_IRUSR | S_IWUSR, debugfsdir,
1227                                 (u32 *) &cnt.num_remote_shutdown_ind);
1228                 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
1229                                 debugfsdir,
1230                                 (u32 *) &cnt.num_tx_flow_off_ind);
1231                 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
1232                                 debugfsdir,
1233                                 (u32 *) &cnt.num_tx_flow_on_ind);
1234                 debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
1235                                 debugfsdir,
1236                                 (u32 *) &cnt.num_rx_flow_off);
1237                 debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
1238                                 debugfsdir,
1239                                 (u32 *) &cnt.num_rx_flow_on);
1240         }
1241 #endif
1242         return af_caif_init();
1243 }
1244
1245 static void __exit caif_sktexit_module(void)
1246 {
1247         sock_unregister(PF_CAIF);
1248         if (debugfsdir != NULL)
1249                 debugfs_remove_recursive(debugfsdir);
1250 }
1251 module_init(caif_sktinit_module);
1252 module_exit(caif_sktexit_module);