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