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 (4096*10)
  32 #define CAIF_DEF_RCVBUF (4096*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         int headroom, tailroom, maxframe;
  80 };
  81
  82 static int rx_flow_is_on(struct caifsock *cf_sk)
  83 {
  84         return test_bit(RX_FLOW_ON_BIT,
  85                         (void *) &cf_sk->flow_state);
  86 }
  87
  88 static int tx_flow_is_on(struct caifsock *cf_sk)
  89 {
  90         return test_bit(TX_FLOW_ON_BIT,
  91                         (void *) &cf_sk->flow_state);
  92 }
  93
  94 static void set_rx_flow_off(struct caifsock *cf_sk)
  95 {
  96          clear_bit(RX_FLOW_ON_BIT,
  97                  (void *) &cf_sk->flow_state);
  98 }
  99
 100 static void set_rx_flow_on(struct caifsock *cf_sk)
 101 {
 102          set_bit(RX_FLOW_ON_BIT,
 103                         (void *) &cf_sk->flow_state);
 104 }
 105
 106 static void set_tx_flow_off(struct caifsock *cf_sk)
 107 {
 108          clear_bit(TX_FLOW_ON_BIT,
 109                 (void *) &cf_sk->flow_state);
 110 }
 111
 112 static void set_tx_flow_on(struct caifsock *cf_sk)
 113 {
 114          set_bit(TX_FLOW_ON_BIT,
 115                 (void *) &cf_sk->flow_state);
 116 }
 117
 118 static void caif_read_lock(struct sock *sk)
 119 {
 120         struct caifsock *cf_sk;
 121         cf_sk = container_of(sk, struct caifsock, sk);
 122         mutex_lock(&cf_sk->readlock);
 123 }
 124
 125 static void caif_read_unlock(struct sock *sk)
 126 {
 127         struct caifsock *cf_sk;
 128         cf_sk = container_of(sk, struct caifsock, sk);
 129         mutex_unlock(&cf_sk->readlock);
 130 }
 131
 132 static int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
 133 {
 134         /* A quarter of full buffer is used a low water mark */
 135         return cf_sk->sk.sk_rcvbuf / 4;
 136 }
 137
 138 static void caif_flow_ctrl(struct sock *sk, int mode)
 139 {
 140         struct caifsock *cf_sk;
 141         cf_sk = container_of(sk, struct caifsock, sk);
 142         if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)
 143                 cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
 144 }
 145
 146 /*
 147  * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
 148  * not dropped, but CAIF is sending flow off instead.
 149  */
 150 static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 151 {
 152         int err;
 153         int skb_len;
 154         unsigned long flags;
 155         struct sk_buff_head *list = &sk->sk_receive_queue;
 156         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 157
 158         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
 159                 (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
 160                 trace_printk("CAIF: %s():"
 161                         " sending flow OFF (queue len = %d %d)\n",
 162                         __func__,
 163                         atomic_read(&cf_sk->sk.sk_rmem_alloc),
 164                         sk_rcvbuf_lowwater(cf_sk));
 165                 set_rx_flow_off(cf_sk);
 166                 dbfs_atomic_inc(&cnt.num_rx_flow_off);
 167                 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
 168         }
 169
 170         err = sk_filter(sk, skb);
 171         if (err)
 172                 return err;
 173         if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
 174                 set_rx_flow_off(cf_sk);
 175                 trace_printk("CAIF: %s():"
 176                         " sending flow OFF due to rmem_schedule\n",
 177                         __func__);
 178                 dbfs_atomic_inc(&cnt.num_rx_flow_off);
 179                 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
 180         }
 181         skb->dev = NULL;
 182         skb_set_owner_r(skb, sk);
 183         /* Cache the SKB length before we tack it onto the receive
 184          * queue. Once it is added it no longer belongs to us and
 185          * may be freed by other threads of control pulling packets
 186          * from the queue.
 187          */
 188         skb_len = skb->len;
 189         spin_lock_irqsave(&list->lock, flags);
 190         if (!sock_flag(sk, SOCK_DEAD))
 191                 __skb_queue_tail(list, skb);
 192         spin_unlock_irqrestore(&list->lock, flags);
 193
 194         if (!sock_flag(sk, SOCK_DEAD))
 195                 sk->sk_data_ready(sk, skb_len);
 196         else
 197                 kfree_skb(skb);
 198         return 0;
 199 }
 200
 201 /* Packet Receive Callback function called from CAIF Stack */
 202 static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
 203 {
 204         struct caifsock *cf_sk;
 205         struct sk_buff *skb;
 206
 207         cf_sk = container_of(layr, struct caifsock, layer);
 208         skb = cfpkt_tonative(pkt);
 209
 210         if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
 211                 cfpkt_destroy(pkt);
 212                 return 0;
 213         }
 214         caif_queue_rcv_skb(&cf_sk->sk, skb);
 215         return 0;
 216 }
 217
 218 /* Packet Control Callback function called from CAIF */
 219 static void caif_ctrl_cb(struct cflayer *layr,
 220                                 enum caif_ctrlcmd flow,
 221                                 int phyid)
 222 {
 223         struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
 224         switch (flow) {
 225         case CAIF_CTRLCMD_FLOW_ON_IND:
 226                 /* OK from modem to start sending again */
 227                 dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
 228                 set_tx_flow_on(cf_sk);
 229                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 230                 break;
 231
 232         case CAIF_CTRLCMD_FLOW_OFF_IND:
 233                 /* Modem asks us to shut up */
 234                 dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
 235                 set_tx_flow_off(cf_sk);
 236                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 237                 break;
 238
 239         case CAIF_CTRLCMD_INIT_RSP:
 240                 /* We're now connected */
 241                 dbfs_atomic_inc(&cnt.num_connect_resp);
 242                 cf_sk->sk.sk_state = CAIF_CONNECTED;
 243                 set_tx_flow_on(cf_sk);
 244                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 245                 break;
 246
 247         case CAIF_CTRLCMD_DEINIT_RSP:
 248                 /* We're now disconnected */
 249                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
 250                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 251                 cfcnfg_release_adap_layer(&cf_sk->layer);
 252                 break;
 253
 254         case CAIF_CTRLCMD_INIT_FAIL_RSP:
 255                 /* Connect request failed */
 256                 dbfs_atomic_inc(&cnt.num_connect_fail_resp);
 257                 cf_sk->sk.sk_err = ECONNREFUSED;
 258                 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
 259                 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
 260                 /*
 261                  * Socket "standards" seems to require POLLOUT to
 262                  * be set at connect failure.
 263                  */
 264                 set_tx_flow_on(cf_sk);
 265                 cf_sk->sk.sk_state_change(&cf_sk->sk);
 266                 break;
 267
 268         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
 269                 /* Modem has closed this connection, or device is down. */
 270                 dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
 271                 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
 272                 cf_sk->sk.sk_err = ECONNRESET;
 273                 set_rx_flow_on(cf_sk);
 274                 cf_sk->sk.sk_error_report(&cf_sk->sk);
 275                 break;
 276
 277         default:
 278                 pr_debug("CAIF: %s(): Unexpected flow command %d\n",
 279                                 __func__, flow);
 280         }
 281 }
 282
 283 static void caif_check_flow_release(struct sock *sk)
 284 {
 285         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 286
 287         if (rx_flow_is_on(cf_sk))
 288                 return;
 289
 290         if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
 291                         dbfs_atomic_inc(&cnt.num_rx_flow_on);
 292                         set_rx_flow_on(cf_sk);
 293                         caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);
 294         }
 295 }
 296
 297 /*
 298  * Copied from unix_dgram_recvmsg, but removed credit checks,
 299  * changed locking, address handling and added MSG_TRUNC.
 300  */
 301 static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
 302                                 struct msghdr *m, size_t len, int flags)
 303
 304 {
 305         struct sock *sk = sock->sk;
 306         struct sk_buff *skb;
 307         int ret;
 308         int copylen;
 309
 310         ret = -EOPNOTSUPP;
 311         if (m->msg_flags&MSG_OOB)
 312                 goto read_error;
 313
 314         skb = skb_recv_datagram(sk, flags, 0 , &ret);
 315         if (!skb)
 316                 goto read_error;
 317         copylen = skb->len;
 318         if (len < copylen) {
 319                 m->msg_flags |= MSG_TRUNC;
 320                 copylen = len;
 321         }
 322
 323         ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen);
 324         if (ret)
 325                 goto out_free;
 326
 327         ret = (flags & MSG_TRUNC) ? skb->len : copylen;
 328 out_free:
 329         skb_free_datagram(sk, skb);
 330         caif_check_flow_release(sk);
 331         return ret;
 332
 333 read_error:
 334         return ret;
 335 }
 336
 337
 338 /* Copied from unix_stream_wait_data, identical except for lock call. */
 339 static long caif_stream_data_wait(struct sock *sk, long timeo)
 340 {
 341         DEFINE_WAIT(wait);
 342         lock_sock(sk);
 343
 344         for (;;) {
 345                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 346
 347                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
 348                         sk->sk_err ||
 349                         sk->sk_state != CAIF_CONNECTED ||
 350                         sock_flag(sk, SOCK_DEAD) ||
 351                         (sk->sk_shutdown & RCV_SHUTDOWN) ||
 352                         signal_pending(current) ||
 353                         !timeo)
 354                         break;
 355
 356                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 357                 release_sock(sk);
 358                 timeo = schedule_timeout(timeo);
 359                 lock_sock(sk);
 360                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 361         }
 362
 363         finish_wait(sk_sleep(sk), &wait);
 364         release_sock(sk);
 365         return timeo;
 366 }
 367
 368
 369 /*
 370  * Copied from unix_stream_recvmsg, but removed credit checks,
 371  * changed locking calls, changed address handling.
 372  */
 373 static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
 374                                 struct msghdr *msg, size_t size,
 375                                 int flags)
 376 {
 377         struct sock *sk = sock->sk;
 378         int copied = 0;
 379         int target;
 380         int err = 0;
 381         long timeo;
 382
 383         err = -EOPNOTSUPP;
 384         if (flags&MSG_OOB)
 385                 goto out;
 386
 387         msg->msg_namelen = 0;
 388
 389         /*
 390          * Lock the socket to prevent queue disordering
 391          * while sleeps in memcpy_tomsg
 392          */
 393         err = -EAGAIN;
 394         if (sk->sk_state == CAIF_CONNECTING)
 395                 goto out;
 396
 397         caif_read_lock(sk);
 398         target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
 399         timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
 400
 401         do {
 402                 int chunk;
 403                 struct sk_buff *skb;
 404
 405                 lock_sock(sk);
 406                 skb = skb_dequeue(&sk->sk_receive_queue);
 407                 caif_check_flow_release(sk);
 408
 409                 if (skb == NULL) {
 410                         if (copied >= target)
 411                                 goto unlock;
 412                         /*
 413                          *      POSIX 1003.1g mandates this order.
 414                          */
 415                         err = sock_error(sk);
 416                         if (err)
 417                                 goto unlock;
 418                         err = -ECONNRESET;
 419                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 420                                 goto unlock;
 421
 422                         err = -EPIPE;
 423                         if (sk->sk_state != CAIF_CONNECTED)
 424                                 goto unlock;
 425                         if (sock_flag(sk, SOCK_DEAD))
 426                                 goto unlock;
 427
 428                         release_sock(sk);
 429
 430                         err = -EAGAIN;
 431                         if (!timeo)
 432                                 break;
 433
 434                         caif_read_unlock(sk);
 435
 436                         timeo = caif_stream_data_wait(sk, timeo);
 437
 438                         if (signal_pending(current)) {
 439                                 err = sock_intr_errno(timeo);
 440                                 goto out;
 441                         }
 442                         caif_read_lock(sk);
 443                         continue;
 444 unlock:
 445                         release_sock(sk);
 446                         break;
 447                 }
 448                 release_sock(sk);
 449                 chunk = min_t(unsigned int, skb->len, size);
 450                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
 451                         skb_queue_head(&sk->sk_receive_queue, skb);
 452                         if (copied == 0)
 453                                 copied = -EFAULT;
 454                         break;
 455                 }
 456                 copied += chunk;
 457                 size -= chunk;
 458
 459                 /* Mark read part of skb as used */
 460                 if (!(flags & MSG_PEEK)) {
 461                         skb_pull(skb, chunk);
 462
 463                         /* put the skb back if we didn't use it up. */
 464                         if (skb->len) {
 465                                 skb_queue_head(&sk->sk_receive_queue, skb);
 466                                 break;
 467                         }
 468                         kfree_skb(skb);
 469
 470                 } else {
 471                         /*
 472                          * It is questionable, see note in unix_dgram_recvmsg.
 473                          */
 474                         /* put message back and return */
 475                         skb_queue_head(&sk->sk_receive_queue, skb);
 476                         break;
 477                 }
 478         } while (size);
 479         caif_read_unlock(sk);
 480
 481 out:
 482         return copied ? : err;
 483 }
 484
 485 /*
 486  * Copied from sock.c:sock_wait_for_wmem, but change to wait for
 487  * CAIF flow-on and sock_writable.
 488  */
 489 static long caif_wait_for_flow_on(struct caifsock *cf_sk,
 490                                 int wait_writeable, long timeo, int *err)
 491 {
 492         struct sock *sk = &cf_sk->sk;
 493         DEFINE_WAIT(wait);
 494         for (;;) {
 495                 *err = 0;
 496                 if (tx_flow_is_on(cf_sk) &&
 497                         (!wait_writeable || sock_writeable(&cf_sk->sk)))
 498                         break;
 499                 *err = -ETIMEDOUT;
 500                 if (!timeo)
 501                         break;
 502                 *err = -ERESTARTSYS;
 503                 if (signal_pending(current))
 504                         break;
 505                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 506                 *err = -ECONNRESET;
 507                 if (sk->sk_shutdown & SHUTDOWN_MASK)
 508                         break;
 509                 *err = -sk->sk_err;
 510                 if (sk->sk_err)
 511                         break;
 512                 *err = -EPIPE;
 513                 if (cf_sk->sk.sk_state != CAIF_CONNECTED)
 514                         break;
 515                 timeo = schedule_timeout(timeo);
 516         }
 517         finish_wait(sk_sleep(sk), &wait);
 518         return timeo;
 519 }
 520
 521 /*
 522  * Transmit a SKB. The device may temporarily request re-transmission
 523  * by returning EAGAIN.
 524  */
 525 static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk,
 526                         int noblock, long timeo)
 527 {
 528         struct cfpkt *pkt;
 529         int ret, loopcnt = 0;
 530
 531         pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
 532         memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info));
 533         do {
 534
 535                 ret = -ETIMEDOUT;
 536
 537                 /* Slight paranoia, probably not needed. */
 538                 if (unlikely(loopcnt++ > 1000)) {
 539                         pr_warning("CAIF: %s(): transmit retries failed,"
 540                                 " error = %d\n", __func__, 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_warning("CAIF: %s(): CAIF Interface MTU too small (%d)\n",
 906                         __func__, dev->mtu);
 907                 err = -ENODEV;
 908                 goto out;
 909         }
 910
 911         err = -EINPROGRESS;
 912 wait_connect:
 913
 914         if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
 915                 goto out;
 916
 917         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 918
 919         release_sock(sk);
 920         err = -ERESTARTSYS;
 921         timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
 922                         sk->sk_state != CAIF_CONNECTING,
 923                         timeo);
 924         lock_sock(sk);
 925         if (timeo < 0)
 926                 goto out; /* -ERESTARTSYS */
 927
 928         err = -ETIMEDOUT;
 929         if (timeo == 0 && sk->sk_state != CAIF_CONNECTED)
 930                 goto out;
 931         if (sk->sk_state != CAIF_CONNECTED) {
 932                 sock->state = SS_UNCONNECTED;
 933                 err = sock_error(sk);
 934                 if (!err)
 935                         err = -ECONNREFUSED;
 936                 goto out;
 937         }
 938         sock->state = SS_CONNECTED;
 939         err = 0;
 940 out:
 941         release_sock(sk);
 942         return err;
 943 }
 944
 945 /*
 946  * caif_release() - Disconnect a CAIF Socket
 947  * Copied and modified af_irda.c:irda_release().
 948  */
 949 static int caif_release(struct socket *sock)
 950 {
 951         struct sock *sk = sock->sk;
 952         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
 953         int res = 0;
 954
 955         if (!sk)
 956                 return 0;
 957
 958         set_tx_flow_off(cf_sk);
 959
 960         /*
 961          * Ensure that packets are not queued after this point in time.
 962          * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
 963          * this ensures no packets when sock is dead.
 964          */
 965         spin_lock(&sk->sk_receive_queue.lock);
 966         sock_set_flag(sk, SOCK_DEAD);
 967         spin_unlock(&sk->sk_receive_queue.lock);
 968         sock->sk = NULL;
 969
 970         dbfs_atomic_inc(&cnt.num_disconnect);
 971
 972         if (cf_sk->debugfs_socket_dir != NULL)
 973                 debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
 974
 975         lock_sock(&(cf_sk->sk));
 976         sk->sk_state = CAIF_DISCONNECTED;
 977         sk->sk_shutdown = SHUTDOWN_MASK;
 978
 979         if (cf_sk->sk.sk_socket->state == SS_CONNECTED ||
 980                 cf_sk->sk.sk_socket->state == SS_CONNECTING)
 981                 res = caif_disconnect_client(&cf_sk->layer);
 982
 983         cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
 984         wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
 985
 986         sock_orphan(sk);
 987         cf_sk->layer.dn = NULL;
 988         sk_stream_kill_queues(&cf_sk->sk);
 989         release_sock(sk);
 990         sock_put(sk);
 991         return res;
 992 }
 993
 994 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
 995 static unsigned int caif_poll(struct file *file,
 996                                 struct socket *sock, poll_table *wait)
 997 {
 998         struct sock *sk = sock->sk;
 999         unsigned int mask;
1000         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1001
1002         sock_poll_wait(file, sk_sleep(sk), wait);
1003         mask = 0;
1004
1005         /* exceptional events? */
1006         if (sk->sk_err)
1007                 mask |= POLLERR;
1008         if (sk->sk_shutdown == SHUTDOWN_MASK)
1009                 mask |= POLLHUP;
1010         if (sk->sk_shutdown & RCV_SHUTDOWN)
1011                 mask |= POLLRDHUP;
1012
1013         /* readable? */
1014         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1015                 (sk->sk_shutdown & RCV_SHUTDOWN))
1016                 mask |= POLLIN | POLLRDNORM;
1017
1018         /*
1019          * we set writable also when the other side has shut down the
1020          * connection. This prevents stuck sockets.
1021          */
1022         if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
1023                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1024
1025         return mask;
1026 }
1027
1028 static const struct proto_ops caif_seqpacket_ops = {
1029         .family = PF_CAIF,
1030         .owner = THIS_MODULE,
1031         .release = caif_release,
1032         .bind = sock_no_bind,
1033         .connect = caif_connect,
1034         .socketpair = sock_no_socketpair,
1035         .accept = sock_no_accept,
1036         .getname = sock_no_getname,
1037         .poll = caif_poll,
1038         .ioctl = sock_no_ioctl,
1039         .listen = sock_no_listen,
1040         .shutdown = sock_no_shutdown,
1041         .setsockopt = setsockopt,
1042         .getsockopt = sock_no_getsockopt,
1043         .sendmsg = caif_seqpkt_sendmsg,
1044         .recvmsg = caif_seqpkt_recvmsg,
1045         .mmap = sock_no_mmap,
1046         .sendpage = sock_no_sendpage,
1047 };
1048
1049 static const struct proto_ops caif_stream_ops = {
1050         .family = PF_CAIF,
1051         .owner = THIS_MODULE,
1052         .release = caif_release,
1053         .bind = sock_no_bind,
1054         .connect = caif_connect,
1055         .socketpair = sock_no_socketpair,
1056         .accept = sock_no_accept,
1057         .getname = sock_no_getname,
1058         .poll = caif_poll,
1059         .ioctl = sock_no_ioctl,
1060         .listen = sock_no_listen,
1061         .shutdown = sock_no_shutdown,
1062         .setsockopt = setsockopt,
1063         .getsockopt = sock_no_getsockopt,
1064         .sendmsg = caif_stream_sendmsg,
1065         .recvmsg = caif_stream_recvmsg,
1066         .mmap = sock_no_mmap,
1067         .sendpage = sock_no_sendpage,
1068 };
1069
1070 /* This function is called when a socket is finally destroyed. */
1071 static void caif_sock_destructor(struct sock *sk)
1072 {
1073         struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
1074         caif_assert(!atomic_read(&sk->sk_wmem_alloc));
1075         caif_assert(sk_unhashed(sk));
1076         caif_assert(!sk->sk_socket);
1077         if (!sock_flag(sk, SOCK_DEAD)) {
1078                 pr_info("Attempt to release alive CAIF socket: %p\n", sk);
1079                 return;
1080         }
1081         sk_stream_kill_queues(&cf_sk->sk);
1082         dbfs_atomic_dec(&cnt.caif_nr_socks);
1083 }
1084
1085 static int caif_create(struct net *net, struct socket *sock, int protocol,
1086                         int kern)
1087 {
1088         struct sock *sk = NULL;
1089         struct caifsock *cf_sk = NULL;
1090         static struct proto prot = {.name = "PF_CAIF",
1091                 .owner = THIS_MODULE,
1092                 .obj_size = sizeof(struct caifsock),
1093         };
1094
1095         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
1096                 return -EPERM;
1097         /*
1098          * The sock->type specifies the socket type to use.
1099          * The CAIF socket is a packet stream in the sense
1100          * that it is packet based. CAIF trusts the reliability
1101          * of the link, no resending is implemented.
1102          */
1103         if (sock->type == SOCK_SEQPACKET)
1104                 sock->ops = &caif_seqpacket_ops;
1105         else if (sock->type == SOCK_STREAM)
1106                 sock->ops = &caif_stream_ops;
1107         else
1108                 return -ESOCKTNOSUPPORT;
1109
1110         if (protocol < 0 || protocol >= CAIFPROTO_MAX)
1111                 return -EPROTONOSUPPORT;
1112         /*
1113          * Set the socket state to unconnected.  The socket state
1114          * is really not used at all in the net/core or socket.c but the
1115          * initialization makes sure that sock->state is not uninitialized.
1116          */
1117         sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
1118         if (!sk)
1119                 return -ENOMEM;
1120
1121         cf_sk = container_of(sk, struct caifsock, sk);
1122
1123         /* Store the protocol */
1124         sk->sk_protocol = (unsigned char) protocol;
1125
1126         /* Sendbuf dictates the amount of outbound packets not yet sent */
1127         sk->sk_sndbuf = CAIF_DEF_SNDBUF;
1128         sk->sk_rcvbuf = CAIF_DEF_RCVBUF;
1129
1130         /*
1131          * Lock in order to try to stop someone from opening the socket
1132          * too early.
1133          */
1134         lock_sock(&(cf_sk->sk));
1135
1136         /* Initialize the nozero default sock structure data. */
1137         sock_init_data(sock, sk);
1138         sk->sk_destruct = caif_sock_destructor;
1139
1140         mutex_init(&cf_sk->readlock); /* single task reading lock */
1141         cf_sk->layer.ctrlcmd = caif_ctrl_cb;
1142         cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
1143         cf_sk->sk.sk_state = CAIF_DISCONNECTED;
1144
1145         set_tx_flow_off(cf_sk);
1146         set_rx_flow_on(cf_sk);
1147
1148         /* Set default options on configuration */
1149         cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
1150         cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
1151         cf_sk->conn_req.protocol = protocol;
1152         /* Increase the number of sockets created. */
1153         dbfs_atomic_inc(&cnt.caif_nr_socks);
1154 #ifdef CONFIG_DEBUG_FS
1155         if (!IS_ERR(debugfsdir)) {
1156                 /* Fill in some information concerning the misc socket. */
1157                 snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
1158                                 atomic_read(&cnt.caif_nr_socks));
1159
1160                 cf_sk->debugfs_socket_dir =
1161                         debugfs_create_dir(cf_sk->name, debugfsdir);
1162                 debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
1163                                 cf_sk->debugfs_socket_dir,
1164                                 (u32 *) &cf_sk->sk.sk_state);
1165                 debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
1166                                 cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
1167                 debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
1168                                 cf_sk->debugfs_socket_dir,
1169                                 (u32 *) &cf_sk->sk.sk_rmem_alloc);
1170                 debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
1171                                 cf_sk->debugfs_socket_dir,
1172                                 (u32 *) &cf_sk->sk.sk_wmem_alloc);
1173                 debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
1174                                 cf_sk->debugfs_socket_dir,
1175                                 (u32 *) &cf_sk->layer.id);
1176         }
1177 #endif
1178         release_sock(&cf_sk->sk);
1179         return 0;
1180 }
1181
1182
1183 static struct net_proto_family caif_family_ops = {
1184         .family = PF_CAIF,
1185         .create = caif_create,
1186         .owner = THIS_MODULE,
1187 };
1188
1189 static int af_caif_init(void)
1190 {
1191         int err = sock_register(&caif_family_ops);
1192         if (!err)
1193                 return err;
1194         return 0;
1195 }
1196
1197 static int __init caif_sktinit_module(void)
1198 {
1199 #ifdef CONFIG_DEBUG_FS
1200         debugfsdir = debugfs_create_dir("caif_sk", NULL);
1201         if (!IS_ERR(debugfsdir)) {
1202                 debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
1203                                 debugfsdir,
1204                                 (u32 *) &cnt.caif_nr_socks);
1205                 debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
1206                                 debugfsdir,
1207                                 (u32 *) &cnt.num_connect_req);
1208                 debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
1209                                 debugfsdir,
1210                                 (u32 *) &cnt.num_connect_resp);
1211                 debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
1212                                 debugfsdir,
1213                                 (u32 *) &cnt.num_connect_fail_resp);
1214                 debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
1215                                 debugfsdir,
1216                                 (u32 *) &cnt.num_disconnect);
1217                 debugfs_create_u32("num_remote_shutdown_ind",
1218                                 S_IRUSR | S_IWUSR, debugfsdir,
1219                                 (u32 *) &cnt.num_remote_shutdown_ind);
1220                 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
1221                                 debugfsdir,
1222                                 (u32 *) &cnt.num_tx_flow_off_ind);
1223                 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
1224                                 debugfsdir,
1225                                 (u32 *) &cnt.num_tx_flow_on_ind);
1226                 debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
1227                                 debugfsdir,
1228                                 (u32 *) &cnt.num_rx_flow_off);
1229                 debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
1230                                 debugfsdir,
1231                                 (u32 *) &cnt.num_rx_flow_on);
1232         }
1233 #endif
1234         return af_caif_init();
1235 }
1236
1237 static void __exit caif_sktexit_module(void)
1238 {
1239         sock_unregister(PF_CAIF);
1240         if (debugfsdir != NULL)
1241                 debugfs_remove_recursive(debugfsdir);
1242 }
1243 module_init(caif_sktinit_module);
1244 module_exit(caif_sktexit_module);