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