net/rxrpc/sendmsg.c

   1 /* AF_RXRPC sendmsg() implementation.
   2  *
   3  * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/net.h>
  15 #include <linux/gfp.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/export.h>
  18 #include <net/sock.h>
  19 #include <net/af_rxrpc.h>
  20 #include "ar-internal.h"
  21
  22 enum rxrpc_command {
  23         RXRPC_CMD_SEND_DATA,            /* send data message */
  24         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
  25         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
  26         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
  27 };
  28
  29 /*
  30  * wait for space to appear in the transmit/ACK window
  31  * - caller holds the socket locked
  32  */
  33 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
  34                                     struct rxrpc_call *call,
  35                                     long *timeo)
  36 {
  37         DECLARE_WAITQUEUE(myself, current);
  38         int ret;
  39
  40         _enter(",{%u,%u,%u}",
  41                call->tx_hard_ack, call->tx_top, call->tx_winsize);
  42
  43         add_wait_queue(&call->waitq, &myself);
  44
  45         for (;;) {
  46                 set_current_state(TASK_INTERRUPTIBLE);
  47                 ret = 0;
  48                 if (call->tx_top - call->tx_hard_ack < call->tx_winsize)
  49                         break;
  50                 if (call->state >= RXRPC_CALL_COMPLETE) {
  51                         ret = -call->error;
  52                         break;
  53                 }
  54                 if (signal_pending(current)) {
  55                         ret = sock_intr_errno(*timeo);
  56                         break;
  57                 }
  58
  59                 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
  60                 release_sock(&rx->sk);
  61                 *timeo = schedule_timeout(*timeo);
  62                 lock_sock(&rx->sk);
  63         }
  64
  65         remove_wait_queue(&call->waitq, &myself);
  66         set_current_state(TASK_RUNNING);
  67         _leave(" = %d", ret);
  68         return ret;
  69 }
  70
  71 /*
  72  * Schedule an instant Tx resend.
  73  */
  74 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
  75 {
  76         spin_lock_bh(&call->lock);
  77
  78         if (call->state < RXRPC_CALL_COMPLETE) {
  79                 call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS;
  80                 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
  81                         rxrpc_queue_call(call);
  82         }
  83
  84         spin_unlock_bh(&call->lock);
  85 }
  86
  87 /*
  88  * Queue a DATA packet for transmission, set the resend timeout and send the
  89  * packet immediately
  90  */
  91 static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
  92                                bool last)
  93 {
  94         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
  95         rxrpc_seq_t seq = sp->hdr.seq;
  96         int ret, ix;
  97
  98         _net("queue skb %p [%d]", skb, seq);
  99
 100         ASSERTCMP(seq, ==, call->tx_top + 1);
 101
 102         ix = seq & RXRPC_RXTX_BUFF_MASK;
 103         rxrpc_get_skb(skb, rxrpc_skb_tx_got);
 104         call->rxtx_annotations[ix] = RXRPC_TX_ANNO_UNACK;
 105         smp_wmb();
 106         call->rxtx_buffer[ix] = skb;
 107         call->tx_top = seq;
 108         if (last) {
 109                 set_bit(RXRPC_CALL_TX_LAST, &call->flags);
 110                 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
 111         } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
 112                 trace_rxrpc_transmit(call, rxrpc_transmit_queue_reqack);
 113         } else {
 114                 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
 115         }
 116
 117         if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
 118                 _debug("________awaiting reply/ACK__________");
 119                 write_lock_bh(&call->state_lock);
 120                 switch (call->state) {
 121                 case RXRPC_CALL_CLIENT_SEND_REQUEST:
 122                         call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
 123                         break;
 124                 case RXRPC_CALL_SERVER_ACK_REQUEST:
 125                         call->state = RXRPC_CALL_SERVER_SEND_REPLY;
 126                         if (!last)
 127                                 break;
 128                 case RXRPC_CALL_SERVER_SEND_REPLY:
 129                         call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
 130                         break;
 131                 default:
 132                         break;
 133                 }
 134                 write_unlock_bh(&call->state_lock);
 135         }
 136
 137         _proto("Tx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
 138
 139         if (seq == 1 && rxrpc_is_client_call(call))
 140                 rxrpc_expose_client_call(call);
 141
 142         sp->resend_at = jiffies + rxrpc_resend_timeout;
 143         ret = rxrpc_send_data_packet(call->conn, skb);
 144         if (ret < 0) {
 145                 _debug("need instant resend %d", ret);
 146                 rxrpc_instant_resend(call, ix);
 147         }
 148
 149         rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
 150         _leave("");
 151 }
 152
 153 /*
 154  * Convert a host-endian header into a network-endian header.
 155  */
 156 static void rxrpc_insert_header(struct sk_buff *skb)
 157 {
 158         struct rxrpc_wire_header whdr;
 159         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 160
 161         whdr.epoch      = htonl(sp->hdr.epoch);
 162         whdr.cid        = htonl(sp->hdr.cid);
 163         whdr.callNumber = htonl(sp->hdr.callNumber);
 164         whdr.seq        = htonl(sp->hdr.seq);
 165         whdr.serial     = htonl(sp->hdr.serial);
 166         whdr.type       = sp->hdr.type;
 167         whdr.flags      = sp->hdr.flags;
 168         whdr.userStatus = sp->hdr.userStatus;
 169         whdr.securityIndex = sp->hdr.securityIndex;
 170         whdr._rsvd      = htons(sp->hdr._rsvd);
 171         whdr.serviceId  = htons(sp->hdr.serviceId);
 172
 173         memcpy(skb->head, &whdr, sizeof(whdr));
 174 }
 175
 176 /*
 177  * send data through a socket
 178  * - must be called in process context
 179  * - caller holds the socket locked
 180  */
 181 static int rxrpc_send_data(struct rxrpc_sock *rx,
 182                            struct rxrpc_call *call,
 183                            struct msghdr *msg, size_t len)
 184 {
 185         struct rxrpc_skb_priv *sp;
 186         struct sk_buff *skb;
 187         struct sock *sk = &rx->sk;
 188         long timeo;
 189         bool more;
 190         int ret, copied;
 191
 192         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 193
 194         /* this should be in poll */
 195         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 196
 197         if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
 198                 return -EPIPE;
 199
 200         more = msg->msg_flags & MSG_MORE;
 201
 202         skb = call->tx_pending;
 203         call->tx_pending = NULL;
 204         rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
 205
 206         copied = 0;
 207         do {
 208                 if (!skb) {
 209                         size_t size, chunk, max, space;
 210
 211                         _debug("alloc");
 212
 213                         if (call->tx_top - call->tx_hard_ack >=
 214                             call->tx_winsize) {
 215                                 ret = -EAGAIN;
 216                                 if (msg->msg_flags & MSG_DONTWAIT)
 217                                         goto maybe_error;
 218                                 ret = rxrpc_wait_for_tx_window(rx, call,
 219                                                                &timeo);
 220                                 if (ret < 0)
 221                                         goto maybe_error;
 222                         }
 223
 224                         max = RXRPC_JUMBO_DATALEN;
 225                         max -= call->conn->security_size;
 226                         max &= ~(call->conn->size_align - 1UL);
 227
 228                         chunk = max;
 229                         if (chunk > msg_data_left(msg) && !more)
 230                                 chunk = msg_data_left(msg);
 231
 232                         space = chunk + call->conn->size_align;
 233                         space &= ~(call->conn->size_align - 1UL);
 234
 235                         size = space + call->conn->header_size;
 236
 237                         _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
 238
 239                         /* create a buffer that we can retain until it's ACK'd */
 240                         skb = sock_alloc_send_skb(
 241                                 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
 242                         if (!skb)
 243                                 goto maybe_error;
 244
 245                         rxrpc_new_skb(skb, rxrpc_skb_tx_new);
 246
 247                         _debug("ALLOC SEND %p", skb);
 248
 249                         ASSERTCMP(skb->mark, ==, 0);
 250
 251                         _debug("HS: %u", call->conn->header_size);
 252                         skb_reserve(skb, call->conn->header_size);
 253                         skb->len += call->conn->header_size;
 254
 255                         sp = rxrpc_skb(skb);
 256                         sp->remain = chunk;
 257                         if (sp->remain > skb_tailroom(skb))
 258                                 sp->remain = skb_tailroom(skb);
 259
 260                         _net("skb: hr %d, tr %d, hl %d, rm %d",
 261                                skb_headroom(skb),
 262                                skb_tailroom(skb),
 263                                skb_headlen(skb),
 264                                sp->remain);
 265
 266                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 267                 }
 268
 269                 _debug("append");
 270                 sp = rxrpc_skb(skb);
 271
 272                 /* append next segment of data to the current buffer */
 273                 if (msg_data_left(msg) > 0) {
 274                         int copy = skb_tailroom(skb);
 275                         ASSERTCMP(copy, >, 0);
 276                         if (copy > msg_data_left(msg))
 277                                 copy = msg_data_left(msg);
 278                         if (copy > sp->remain)
 279                                 copy = sp->remain;
 280
 281                         _debug("add");
 282                         ret = skb_add_data(skb, &msg->msg_iter, copy);
 283                         _debug("added");
 284                         if (ret < 0)
 285                                 goto efault;
 286                         sp->remain -= copy;
 287                         skb->mark += copy;
 288                         copied += copy;
 289                 }
 290
 291                 /* check for the far side aborting the call or a network error
 292                  * occurring */
 293                 if (call->state == RXRPC_CALL_COMPLETE)
 294                         goto call_terminated;
 295
 296                 /* add the packet to the send queue if it's now full */
 297                 if (sp->remain <= 0 ||
 298                     (msg_data_left(msg) == 0 && !more)) {
 299                         struct rxrpc_connection *conn = call->conn;
 300                         uint32_t seq;
 301                         size_t pad;
 302
 303                         /* pad out if we're using security */
 304                         if (conn->security_ix) {
 305                                 pad = conn->security_size + skb->mark;
 306                                 pad = conn->size_align - pad;
 307                                 pad &= conn->size_align - 1;
 308                                 _debug("pad %zu", pad);
 309                                 if (pad)
 310                                         memset(skb_put(skb, pad), 0, pad);
 311                         }
 312
 313                         seq = call->tx_top + 1;
 314
 315                         sp->hdr.epoch   = conn->proto.epoch;
 316                         sp->hdr.cid     = call->cid;
 317                         sp->hdr.callNumber = call->call_id;
 318                         sp->hdr.seq     = seq;
 319                         sp->hdr.serial  = atomic_inc_return(&conn->serial);
 320                         sp->hdr.type    = RXRPC_PACKET_TYPE_DATA;
 321                         sp->hdr.userStatus = 0;
 322                         sp->hdr.securityIndex = call->security_ix;
 323                         sp->hdr._rsvd   = 0;
 324                         sp->hdr.serviceId = call->service_id;
 325
 326                         sp->hdr.flags = conn->out_clientflag;
 327                         if (msg_data_left(msg) == 0 && !more)
 328                                 sp->hdr.flags |= RXRPC_LAST_PACKET;
 329                         else if (call->tx_top - call->tx_hard_ack <
 330                                  call->tx_winsize)
 331                                 sp->hdr.flags |= RXRPC_MORE_PACKETS;
 332                         if (more && seq & 1)
 333                                 sp->hdr.flags |= RXRPC_REQUEST_ACK;
 334
 335                         ret = conn->security->secure_packet(
 336                                 call, skb, skb->mark,
 337                                 skb->head + sizeof(struct rxrpc_wire_header));
 338                         if (ret < 0)
 339                                 goto out;
 340
 341                         rxrpc_insert_header(skb);
 342                         rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
 343                         skb = NULL;
 344                 }
 345         } while (msg_data_left(msg) > 0);
 346
 347 success:
 348         ret = copied;
 349 out:
 350         call->tx_pending = skb;
 351         _leave(" = %d", ret);
 352         return ret;
 353
 354 call_terminated:
 355         rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
 356         _leave(" = %d", -call->error);
 357         return -call->error;
 358
 359 maybe_error:
 360         if (copied)
 361                 goto success;
 362         goto out;
 363
 364 efault:
 365         ret = -EFAULT;
 366         goto out;
 367 }
 368
 369 /*
 370  * extract control messages from the sendmsg() control buffer
 371  */
 372 static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
 373                               unsigned long *user_call_ID,
 374                               enum rxrpc_command *command,
 375                               u32 *abort_code,
 376                               bool *_exclusive)
 377 {
 378         struct cmsghdr *cmsg;
 379         bool got_user_ID = false;
 380         int len;
 381
 382         *command = RXRPC_CMD_SEND_DATA;
 383
 384         if (msg->msg_controllen == 0)
 385                 return -EINVAL;
 386
 387         for_each_cmsghdr(cmsg, msg) {
 388                 if (!CMSG_OK(msg, cmsg))
 389                         return -EINVAL;
 390
 391                 len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 392                 _debug("CMSG %d, %d, %d",
 393                        cmsg->cmsg_level, cmsg->cmsg_type, len);
 394
 395                 if (cmsg->cmsg_level != SOL_RXRPC)
 396                         continue;
 397
 398                 switch (cmsg->cmsg_type) {
 399                 case RXRPC_USER_CALL_ID:
 400                         if (msg->msg_flags & MSG_CMSG_COMPAT) {
 401                                 if (len != sizeof(u32))
 402                                         return -EINVAL;
 403                                 *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
 404                         } else {
 405                                 if (len != sizeof(unsigned long))
 406                                         return -EINVAL;
 407                                 *user_call_ID = *(unsigned long *)
 408                                         CMSG_DATA(cmsg);
 409                         }
 410                         _debug("User Call ID %lx", *user_call_ID);
 411                         got_user_ID = true;
 412                         break;
 413
 414                 case RXRPC_ABORT:
 415                         if (*command != RXRPC_CMD_SEND_DATA)
 416                                 return -EINVAL;
 417                         *command = RXRPC_CMD_SEND_ABORT;
 418                         if (len != sizeof(*abort_code))
 419                                 return -EINVAL;
 420                         *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
 421                         _debug("Abort %x", *abort_code);
 422                         if (*abort_code == 0)
 423                                 return -EINVAL;
 424                         break;
 425
 426                 case RXRPC_ACCEPT:
 427                         if (*command != RXRPC_CMD_SEND_DATA)
 428                                 return -EINVAL;
 429                         *command = RXRPC_CMD_ACCEPT;
 430                         if (len != 0)
 431                                 return -EINVAL;
 432                         break;
 433
 434                 case RXRPC_EXCLUSIVE_CALL:
 435                         *_exclusive = true;
 436                         if (len != 0)
 437                                 return -EINVAL;
 438                         break;
 439                 default:
 440                         return -EINVAL;
 441                 }
 442         }
 443
 444         if (!got_user_ID)
 445                 return -EINVAL;
 446         _leave(" = 0");
 447         return 0;
 448 }
 449
 450 /*
 451  * Create a new client call for sendmsg().
 452  */
 453 static struct rxrpc_call *
 454 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
 455                                   unsigned long user_call_ID, bool exclusive)
 456 {
 457         struct rxrpc_conn_parameters cp;
 458         struct rxrpc_call *call;
 459         struct key *key;
 460
 461         DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
 462
 463         _enter("");
 464
 465         if (!msg->msg_name)
 466                 return ERR_PTR(-EDESTADDRREQ);
 467
 468         key = rx->key;
 469         if (key && !rx->key->payload.data[0])
 470                 key = NULL;
 471
 472         memset(&cp, 0, sizeof(cp));
 473         cp.local                = rx->local;
 474         cp.key                  = rx->key;
 475         cp.security_level       = rx->min_sec_level;
 476         cp.exclusive            = rx->exclusive | exclusive;
 477         cp.service_id           = srx->srx_service;
 478         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
 479
 480         _leave(" = %p\n", call);
 481         return call;
 482 }
 483
 484 /*
 485  * send a message forming part of a client call through an RxRPC socket
 486  * - caller holds the socket locked
 487  * - the socket may be either a client socket or a server socket
 488  */
 489 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 490 {
 491         enum rxrpc_command cmd;
 492         struct rxrpc_call *call;
 493         unsigned long user_call_ID = 0;
 494         bool exclusive = false;
 495         u32 abort_code = 0;
 496         int ret;
 497
 498         _enter("");
 499
 500         ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code,
 501                                  &exclusive);
 502         if (ret < 0)
 503                 return ret;
 504
 505         if (cmd == RXRPC_CMD_ACCEPT) {
 506                 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
 507                         return -EINVAL;
 508                 call = rxrpc_accept_call(rx, user_call_ID, NULL);
 509                 if (IS_ERR(call))
 510                         return PTR_ERR(call);
 511                 rxrpc_put_call(call, rxrpc_call_put);
 512                 return 0;
 513         }
 514
 515         call = rxrpc_find_call_by_user_ID(rx, user_call_ID);
 516         if (!call) {
 517                 if (cmd != RXRPC_CMD_SEND_DATA)
 518                         return -EBADSLT;
 519                 call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID,
 520                                                          exclusive);
 521                 if (IS_ERR(call))
 522                         return PTR_ERR(call);
 523         }
 524
 525         _debug("CALL %d USR %lx ST %d on CONN %p",
 526                call->debug_id, call->user_call_ID, call->state, call->conn);
 527
 528         if (call->state >= RXRPC_CALL_COMPLETE) {
 529                 /* it's too late for this call */
 530                 ret = -ESHUTDOWN;
 531         } else if (cmd == RXRPC_CMD_SEND_ABORT) {
 532                 ret = 0;
 533                 if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED))
 534                         ret = rxrpc_send_call_packet(call,
 535                                                      RXRPC_PACKET_TYPE_ABORT);
 536         } else if (cmd != RXRPC_CMD_SEND_DATA) {
 537                 ret = -EINVAL;
 538         } else if (rxrpc_is_client_call(call) &&
 539                    call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
 540                 /* request phase complete for this client call */
 541                 ret = -EPROTO;
 542         } else if (rxrpc_is_service_call(call) &&
 543                    call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
 544                    call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
 545                 /* Reply phase not begun or not complete for service call. */
 546                 ret = -EPROTO;
 547         } else {
 548                 ret = rxrpc_send_data(rx, call, msg, len);
 549         }
 550
 551         rxrpc_put_call(call, rxrpc_call_put);
 552         _leave(" = %d", ret);
 553         return ret;
 554 }
 555
 556 /**
 557  * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
 558  * @sock: The socket the call is on
 559  * @call: The call to send data through
 560  * @msg: The data to send
 561  * @len: The amount of data to send
 562  *
 563  * Allow a kernel service to send data on a call.  The call must be in an state
 564  * appropriate to sending data.  No control data should be supplied in @msg,
 565  * nor should an address be supplied.  MSG_MORE should be flagged if there's
 566  * more data to come, otherwise this data will end the transmission phase.
 567  */
 568 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
 569                            struct msghdr *msg, size_t len)
 570 {
 571         int ret;
 572
 573         _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
 574
 575         ASSERTCMP(msg->msg_name, ==, NULL);
 576         ASSERTCMP(msg->msg_control, ==, NULL);
 577
 578         lock_sock(sock->sk);
 579
 580         _debug("CALL %d USR %lx ST %d on CONN %p",
 581                call->debug_id, call->user_call_ID, call->state, call->conn);
 582
 583         if (call->state >= RXRPC_CALL_COMPLETE) {
 584                 ret = -ESHUTDOWN; /* it's too late for this call */
 585         } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
 586                    call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
 587                    call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
 588                 ret = -EPROTO; /* request phase complete for this client call */
 589         } else {
 590                 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
 591         }
 592
 593         release_sock(sock->sk);
 594         _leave(" = %d", ret);
 595         return ret;
 596 }
 597 EXPORT_SYMBOL(rxrpc_kernel_send_data);
 598
 599 /**
 600  * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
 601  * @sock: The socket the call is on
 602  * @call: The call to be aborted
 603  * @abort_code: The abort code to stick into the ABORT packet
 604  * @error: Local error value
 605  * @why: 3-char string indicating why.
 606  *
 607  * Allow a kernel service to abort a call, if it's still in an abortable state.
 608  */
 609 void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
 610                              u32 abort_code, int error, const char *why)
 611 {
 612         _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
 613
 614         lock_sock(sock->sk);
 615
 616         if (rxrpc_abort_call(why, call, 0, abort_code, error))
 617                 rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
 618
 619         release_sock(sock->sk);
 620         _leave("");
 621 }
 622
 623 EXPORT_SYMBOL(rxrpc_kernel_abort_call);