net/rxrpc/call_object.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* RxRPC individual remote procedure call handling
   3  *
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/slab.h>
  11 #include <linux/module.h>
  12 #include <linux/circ_buf.h>
  13 #include <linux/spinlock_types.h>
  14 #include <net/sock.h>
  15 #include <net/af_rxrpc.h>
  16 #include "ar-internal.h"
  17
  18 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
  19         [RXRPC_CALL_UNINITIALISED]              = "Uninit  ",
  20         [RXRPC_CALL_CLIENT_AWAIT_CONN]          = "ClWtConn",
  21         [RXRPC_CALL_CLIENT_SEND_REQUEST]        = "ClSndReq",
  22         [RXRPC_CALL_CLIENT_AWAIT_REPLY]         = "ClAwtRpl",
  23         [RXRPC_CALL_CLIENT_RECV_REPLY]          = "ClRcvRpl",
  24         [RXRPC_CALL_SERVER_PREALLOC]            = "SvPrealc",
  25         [RXRPC_CALL_SERVER_SECURING]            = "SvSecure",
  26         [RXRPC_CALL_SERVER_RECV_REQUEST]        = "SvRcvReq",
  27         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
  28         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
  29         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
  30         [RXRPC_CALL_COMPLETE]                   = "Complete",
  31 };
  32
  33 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
  34         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
  35         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
  36         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
  37         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
  38         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
  39 };
  40
  41 struct kmem_cache *rxrpc_call_jar;
  42
  43 static void rxrpc_call_timer_expired(struct timer_list *t)
  44 {
  45         struct rxrpc_call *call = from_timer(call, t, timer);
  46
  47         _enter("%d", call->debug_id);
  48
  49         if (call->state < RXRPC_CALL_COMPLETE) {
  50                 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
  51                 rxrpc_queue_call(call);
  52         }
  53 }
  54
  55 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  56
  57 /*
  58  * find an extant server call
  59  * - called in process context with IRQs enabled
  60  */
  61 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  62                                               unsigned long user_call_ID)
  63 {
  64         struct rxrpc_call *call;
  65         struct rb_node *p;
  66
  67         _enter("%p,%lx", rx, user_call_ID);
  68
  69         read_lock(&rx->call_lock);
  70
  71         p = rx->calls.rb_node;
  72         while (p) {
  73                 call = rb_entry(p, struct rxrpc_call, sock_node);
  74
  75                 if (user_call_ID < call->user_call_ID)
  76                         p = p->rb_left;
  77                 else if (user_call_ID > call->user_call_ID)
  78                         p = p->rb_right;
  79                 else
  80                         goto found_extant_call;
  81         }
  82
  83         read_unlock(&rx->call_lock);
  84         _leave(" = NULL");
  85         return NULL;
  86
  87 found_extant_call:
  88         rxrpc_get_call(call, rxrpc_call_got);
  89         read_unlock(&rx->call_lock);
  90         _leave(" = %p [%d]", call, atomic_read(&call->usage));
  91         return call;
  92 }
  93
  94 /*
  95  * allocate a new call
  96  */
  97 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
  98                                     unsigned int debug_id)
  99 {
 100         struct rxrpc_call *call;
 101         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 102
 103         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 104         if (!call)
 105                 return NULL;
 106
 107         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 108                                     sizeof(struct sk_buff *),
 109                                     gfp);
 110         if (!call->rxtx_buffer)
 111                 goto nomem;
 112
 113         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 114         if (!call->rxtx_annotations)
 115                 goto nomem_2;
 116
 117         mutex_init(&call->user_mutex);
 118
 119         /* Prevent lockdep reporting a deadlock false positive between the afs
 120          * filesystem and sys_sendmsg() via the mmap sem.
 121          */
 122         if (rx->sk.sk_kern_sock)
 123                 lockdep_set_class(&call->user_mutex,
 124                                   &rxrpc_call_user_mutex_lock_class_key);
 125
 126         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 127         INIT_WORK(&call->processor, &rxrpc_process_call);
 128         INIT_LIST_HEAD(&call->link);
 129         INIT_LIST_HEAD(&call->chan_wait_link);
 130         INIT_LIST_HEAD(&call->accept_link);
 131         INIT_LIST_HEAD(&call->recvmsg_link);
 132         INIT_LIST_HEAD(&call->sock_link);
 133         init_waitqueue_head(&call->waitq);
 134         spin_lock_init(&call->lock);
 135         spin_lock_init(&call->notify_lock);
 136         spin_lock_init(&call->input_lock);
 137         rwlock_init(&call->state_lock);
 138         atomic_set(&call->usage, 1);
 139         call->debug_id = debug_id;
 140         call->tx_total_len = -1;
 141         call->next_rx_timo = 20 * HZ;
 142         call->next_req_timo = 1 * HZ;
 143
 144         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 145
 146         /* Leave space in the ring to handle a maxed-out jumbo packet */
 147         call->rx_winsize = rxrpc_rx_window_size;
 148         call->tx_winsize = 16;
 149         call->rx_expect_next = 1;
 150
 151         call->cong_cwnd = 2;
 152         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
 153
 154         call->rxnet = rxnet;
 155         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 156         atomic_inc(&rxnet->nr_calls);
 157         return call;
 158
 159 nomem_2:
 160         kfree(call->rxtx_buffer);
 161 nomem:
 162         kmem_cache_free(rxrpc_call_jar, call);
 163         return NULL;
 164 }
 165
 166 /*
 167  * Allocate a new client call.
 168  */
 169 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 170                                                   struct sockaddr_rxrpc *srx,
 171                                                   gfp_t gfp,
 172                                                   unsigned int debug_id)
 173 {
 174         struct rxrpc_call *call;
 175         ktime_t now;
 176
 177         _enter("");
 178
 179         call = rxrpc_alloc_call(rx, gfp, debug_id);
 180         if (!call)
 181                 return ERR_PTR(-ENOMEM);
 182         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 183         call->service_id = srx->srx_service;
 184         call->tx_phase = true;
 185         now = ktime_get_real();
 186         call->acks_latest_ts = now;
 187         call->cong_tstamp = now;
 188
 189         _leave(" = %p", call);
 190         return call;
 191 }
 192
 193 /*
 194  * Initiate the call ack/resend/expiry timer.
 195  */
 196 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 197 {
 198         unsigned long now = jiffies;
 199         unsigned long j = now + MAX_JIFFY_OFFSET;
 200
 201         call->ack_at = j;
 202         call->ack_lost_at = j;
 203         call->resend_at = j;
 204         call->ping_at = j;
 205         call->expect_rx_by = j;
 206         call->expect_req_by = j;
 207         call->expect_term_by = j;
 208         call->timer.expires = now;
 209 }
 210
 211 /*
 212  * Set up a call for the given parameters.
 213  * - Called with the socket lock held, which it must release.
 214  * - If it returns a call, the call's lock will need releasing by the caller.
 215  */
 216 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 217                                          struct rxrpc_conn_parameters *cp,
 218                                          struct sockaddr_rxrpc *srx,
 219                                          struct rxrpc_call_params *p,
 220                                          gfp_t gfp,
 221                                          unsigned int debug_id)
 222         __releases(&rx->sk.sk_lock.slock)
 223         __acquires(&call->user_mutex)
 224 {
 225         struct rxrpc_call *call, *xcall;
 226         struct rxrpc_net *rxnet;
 227         struct rb_node *parent, **pp;
 228         const void *here = __builtin_return_address(0);
 229         int ret;
 230
 231         _enter("%p,%lx", rx, p->user_call_ID);
 232
 233         call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
 234         if (IS_ERR(call)) {
 235                 release_sock(&rx->sk);
 236                 _leave(" = %ld", PTR_ERR(call));
 237                 return call;
 238         }
 239
 240         call->interruptibility = p->interruptibility;
 241         call->tx_total_len = p->tx_total_len;
 242         trace_rxrpc_call(call->debug_id, rxrpc_call_new_client,
 243                          atomic_read(&call->usage),
 244                          here, (const void *)p->user_call_ID);
 245
 246         /* We need to protect a partially set up call against the user as we
 247          * will be acting outside the socket lock.
 248          */
 249         mutex_lock(&call->user_mutex);
 250
 251         /* Publish the call, even though it is incompletely set up as yet */
 252         write_lock(&rx->call_lock);
 253
 254         pp = &rx->calls.rb_node;
 255         parent = NULL;
 256         while (*pp) {
 257                 parent = *pp;
 258                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 259
 260                 if (p->user_call_ID < xcall->user_call_ID)
 261                         pp = &(*pp)->rb_left;
 262                 else if (p->user_call_ID > xcall->user_call_ID)
 263                         pp = &(*pp)->rb_right;
 264                 else
 265                         goto error_dup_user_ID;
 266         }
 267
 268         rcu_assign_pointer(call->socket, rx);
 269         call->user_call_ID = p->user_call_ID;
 270         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 271         rxrpc_get_call(call, rxrpc_call_got_userid);
 272         rb_link_node(&call->sock_node, parent, pp);
 273         rb_insert_color(&call->sock_node, &rx->calls);
 274         list_add(&call->sock_link, &rx->sock_calls);
 275
 276         write_unlock(&rx->call_lock);
 277
 278         rxnet = call->rxnet;
 279         write_lock(&rxnet->call_lock);
 280         list_add_tail(&call->link, &rxnet->calls);
 281         write_unlock(&rxnet->call_lock);
 282
 283         /* From this point on, the call is protected by its own lock. */
 284         release_sock(&rx->sk);
 285
 286         /* Set up or get a connection record and set the protocol parameters,
 287          * including channel number and call ID.
 288          */
 289         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
 290         if (ret < 0)
 291                 goto error_attached_to_socket;
 292
 293         trace_rxrpc_call(call->debug_id, rxrpc_call_connected,
 294                          atomic_read(&call->usage), here, NULL);
 295
 296         rxrpc_start_call_timer(call);
 297
 298         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 299
 300         _leave(" = %p [new]", call);
 301         return call;
 302
 303         /* We unexpectedly found the user ID in the list after taking
 304          * the call_lock.  This shouldn't happen unless the user races
 305          * with itself and tries to add the same user ID twice at the
 306          * same time in different threads.
 307          */
 308 error_dup_user_ID:
 309         write_unlock(&rx->call_lock);
 310         release_sock(&rx->sk);
 311         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 312                                     RX_CALL_DEAD, -EEXIST);
 313         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 314                          atomic_read(&call->usage), here, ERR_PTR(-EEXIST));
 315         rxrpc_release_call(rx, call);
 316         mutex_unlock(&call->user_mutex);
 317         rxrpc_put_call(call, rxrpc_call_put);
 318         _leave(" = -EEXIST");
 319         return ERR_PTR(-EEXIST);
 320
 321         /* We got an error, but the call is attached to the socket and is in
 322          * need of release.  However, we might now race with recvmsg() when
 323          * completing the call queues it.  Return 0 from sys_sendmsg() and
 324          * leave the error to recvmsg() to deal with.
 325          */
 326 error_attached_to_socket:
 327         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 328                          atomic_read(&call->usage), here, ERR_PTR(ret));
 329         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 330         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 331                                     RX_CALL_DEAD, ret);
 332         _leave(" = c=%08x [err]", call->debug_id);
 333         return call;
 334 }
 335
 336 /*
 337  * Set up an incoming call.  call->conn points to the connection.
 338  * This is called in BH context and isn't allowed to fail.
 339  */
 340 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 341                          struct rxrpc_call *call,
 342                          struct sk_buff *skb)
 343 {
 344         struct rxrpc_connection *conn = call->conn;
 345         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 346         u32 chan;
 347
 348         _enter(",%d", call->conn->debug_id);
 349
 350         rcu_assign_pointer(call->socket, rx);
 351         call->call_id           = sp->hdr.callNumber;
 352         call->service_id        = sp->hdr.serviceId;
 353         call->cid               = sp->hdr.cid;
 354         call->state             = RXRPC_CALL_SERVER_SECURING;
 355         call->cong_tstamp       = skb->tstamp;
 356
 357         /* Set the channel for this call.  We don't get channel_lock as we're
 358          * only defending against the data_ready handler (which we're called
 359          * from) and the RESPONSE packet parser (which is only really
 360          * interested in call_counter and can cope with a disagreement with the
 361          * call pointer).
 362          */
 363         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 364         conn->channels[chan].call_counter = call->call_id;
 365         conn->channels[chan].call_id = call->call_id;
 366         rcu_assign_pointer(conn->channels[chan].call, call);
 367
 368         spin_lock(&conn->params.peer->lock);
 369         hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
 370         spin_unlock(&conn->params.peer->lock);
 371
 372         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 373
 374         rxrpc_start_call_timer(call);
 375         _leave("");
 376 }
 377
 378 /*
 379  * Queue a call's work processor, getting a ref to pass to the work queue.
 380  */
 381 bool rxrpc_queue_call(struct rxrpc_call *call)
 382 {
 383         const void *here = __builtin_return_address(0);
 384         int n = atomic_fetch_add_unless(&call->usage, 1, 0);
 385         if (n == 0)
 386                 return false;
 387         if (rxrpc_queue_work(&call->processor))
 388                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
 389                                  here, NULL);
 390         else
 391                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 392         return true;
 393 }
 394
 395 /*
 396  * Queue a call's work processor, passing the callers ref to the work queue.
 397  */
 398 bool __rxrpc_queue_call(struct rxrpc_call *call)
 399 {
 400         const void *here = __builtin_return_address(0);
 401         int n = atomic_read(&call->usage);
 402         ASSERTCMP(n, >=, 1);
 403         if (rxrpc_queue_work(&call->processor))
 404                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
 405                                  here, NULL);
 406         else
 407                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 408         return true;
 409 }
 410
 411 /*
 412  * Note the re-emergence of a call.
 413  */
 414 void rxrpc_see_call(struct rxrpc_call *call)
 415 {
 416         const void *here = __builtin_return_address(0);
 417         if (call) {
 418                 int n = atomic_read(&call->usage);
 419
 420                 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
 421                                  here, NULL);
 422         }
 423 }
 424
 425 /*
 426  * Note the addition of a ref on a call.
 427  */
 428 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 429 {
 430         const void *here = __builtin_return_address(0);
 431         int n = atomic_inc_return(&call->usage);
 432
 433         trace_rxrpc_call(call->debug_id, op, n, here, NULL);
 434 }
 435
 436 /*
 437  * Clean up the RxTx skb ring.
 438  */
 439 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 440 {
 441         int i;
 442
 443         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 444                 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
 445                 call->rxtx_buffer[i] = NULL;
 446         }
 447 }
 448
 449 /*
 450  * Detach a call from its owning socket.
 451  */
 452 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 453 {
 454         const void *here = __builtin_return_address(0);
 455         struct rxrpc_connection *conn = call->conn;
 456         bool put = false;
 457
 458         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 459
 460         trace_rxrpc_call(call->debug_id, rxrpc_call_release,
 461                          atomic_read(&call->usage),
 462                          here, (const void *)call->flags);
 463
 464         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 465
 466         spin_lock_bh(&call->lock);
 467         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 468                 BUG();
 469         spin_unlock_bh(&call->lock);
 470
 471         del_timer_sync(&call->timer);
 472
 473         /* Make sure we don't get any more notifications */
 474         write_lock_bh(&rx->recvmsg_lock);
 475
 476         if (!list_empty(&call->recvmsg_link)) {
 477                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 478                        call, call->events, call->flags);
 479                 list_del(&call->recvmsg_link);
 480                 put = true;
 481         }
 482
 483         /* list_empty() must return false in rxrpc_notify_socket() */
 484         call->recvmsg_link.next = NULL;
 485         call->recvmsg_link.prev = NULL;
 486
 487         write_unlock_bh(&rx->recvmsg_lock);
 488         if (put)
 489                 rxrpc_put_call(call, rxrpc_call_put);
 490
 491         write_lock(&rx->call_lock);
 492
 493         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 494                 rb_erase(&call->sock_node, &rx->calls);
 495                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 496                 rxrpc_put_call(call, rxrpc_call_put_userid);
 497         }
 498
 499         list_del(&call->sock_link);
 500         write_unlock(&rx->call_lock);
 501
 502         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 503
 504         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
 505                 rxrpc_disconnect_call(call);
 506         if (call->security)
 507                 call->security->free_call_crypto(call);
 508
 509         rxrpc_cleanup_ring(call);
 510         _leave("");
 511 }
 512
 513 /*
 514  * release all the calls associated with a socket
 515  */
 516 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 517 {
 518         struct rxrpc_call *call;
 519
 520         _enter("%p", rx);
 521
 522         while (!list_empty(&rx->to_be_accepted)) {
 523                 call = list_entry(rx->to_be_accepted.next,
 524                                   struct rxrpc_call, accept_link);
 525                 list_del(&call->accept_link);
 526                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
 527                 rxrpc_put_call(call, rxrpc_call_put);
 528         }
 529
 530         while (!list_empty(&rx->sock_calls)) {
 531                 call = list_entry(rx->sock_calls.next,
 532                                   struct rxrpc_call, sock_link);
 533                 rxrpc_get_call(call, rxrpc_call_got);
 534                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
 535                 rxrpc_send_abort_packet(call);
 536                 rxrpc_release_call(rx, call);
 537                 rxrpc_put_call(call, rxrpc_call_put);
 538         }
 539
 540         _leave("");
 541 }
 542
 543 /*
 544  * release a call
 545  */
 546 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 547 {
 548         struct rxrpc_net *rxnet = call->rxnet;
 549         const void *here = __builtin_return_address(0);
 550         unsigned int debug_id = call->debug_id;
 551         int n;
 552
 553         ASSERT(call != NULL);
 554
 555         n = atomic_dec_return(&call->usage);
 556         trace_rxrpc_call(debug_id, op, n, here, NULL);
 557         ASSERTCMP(n, >=, 0);
 558         if (n == 0) {
 559                 _debug("call %d dead", call->debug_id);
 560                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 561
 562                 if (!list_empty(&call->link)) {
 563                         write_lock(&rxnet->call_lock);
 564                         list_del_init(&call->link);
 565                         write_unlock(&rxnet->call_lock);
 566                 }
 567
 568                 rxrpc_cleanup_call(call);
 569         }
 570 }
 571
 572 /*
 573  * Final call destruction - but must be done in process context.
 574  */
 575 static void rxrpc_destroy_call(struct work_struct *work)
 576 {
 577         struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
 578         struct rxrpc_net *rxnet = call->rxnet;
 579
 580         rxrpc_put_connection(call->conn);
 581         rxrpc_put_peer(call->peer);
 582         kfree(call->rxtx_buffer);
 583         kfree(call->rxtx_annotations);
 584         kmem_cache_free(rxrpc_call_jar, call);
 585         if (atomic_dec_and_test(&rxnet->nr_calls))
 586                 wake_up_var(&rxnet->nr_calls);
 587 }
 588
 589 /*
 590  * Final call destruction under RCU.
 591  */
 592 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 593 {
 594         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 595
 596         if (in_softirq()) {
 597                 INIT_WORK(&call->processor, rxrpc_destroy_call);
 598                 if (!rxrpc_queue_work(&call->processor))
 599                         BUG();
 600         } else {
 601                 rxrpc_destroy_call(&call->processor);
 602         }
 603 }
 604
 605 /*
 606  * clean up a call
 607  */
 608 void rxrpc_cleanup_call(struct rxrpc_call *call)
 609 {
 610         _net("DESTROY CALL %d", call->debug_id);
 611
 612         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 613
 614         del_timer_sync(&call->timer);
 615
 616         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 617         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 618
 619         rxrpc_cleanup_ring(call);
 620         rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned);
 621
 622         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 623 }
 624
 625 /*
 626  * Make sure that all calls are gone from a network namespace.  To reach this
 627  * point, any open UDP sockets in that namespace must have been closed, so any
 628  * outstanding calls cannot be doing I/O.
 629  */
 630 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 631 {
 632         struct rxrpc_call *call;
 633
 634         _enter("");
 635
 636         if (!list_empty(&rxnet->calls)) {
 637                 write_lock(&rxnet->call_lock);
 638
 639                 while (!list_empty(&rxnet->calls)) {
 640                         call = list_entry(rxnet->calls.next,
 641                                           struct rxrpc_call, link);
 642                         _debug("Zapping call %p", call);
 643
 644                         rxrpc_see_call(call);
 645                         list_del_init(&call->link);
 646
 647                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 648                                call, atomic_read(&call->usage),
 649                                rxrpc_call_states[call->state],
 650                                call->flags, call->events);
 651
 652                         write_unlock(&rxnet->call_lock);
 653                         cond_resched();
 654                         write_lock(&rxnet->call_lock);
 655                 }
 656
 657                 write_unlock(&rxnet->call_lock);
 658         }
 659
 660         atomic_dec(&rxnet->nr_calls);
 661         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 662 }