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