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