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_ACCEPTING]           = "SvAccept",
  27         [RXRPC_CALL_SERVER_RECV_REQUEST]        = "SvRcvReq",
  28         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
  29         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
  30         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
  31         [RXRPC_CALL_COMPLETE]                   = "Complete",
  32 };
  33
  34 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
  35         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
  36         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
  37         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
  38         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
  39         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
  40 };
  41
  42 struct kmem_cache *rxrpc_call_jar;
  43
  44 static void rxrpc_call_timer_expired(struct timer_list *t)
  45 {
  46         struct rxrpc_call *call = from_timer(call, t, timer);
  47
  48         _enter("%d", call->debug_id);
  49
  50         if (call->state < RXRPC_CALL_COMPLETE) {
  51                 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
  52                 rxrpc_queue_call(call);
  53         }
  54 }
  55
  56 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  57
  58 /*
  59  * find an extant server call
  60  * - called in process context with IRQs enabled
  61  */
  62 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  63                                               unsigned long user_call_ID)
  64 {
  65         struct rxrpc_call *call;
  66         struct rb_node *p;
  67
  68         _enter("%p,%lx", rx, user_call_ID);
  69
  70         read_lock(&rx->call_lock);
  71
  72         p = rx->calls.rb_node;
  73         while (p) {
  74                 call = rb_entry(p, struct rxrpc_call, sock_node);
  75
  76                 if (user_call_ID < call->user_call_ID)
  77                         p = p->rb_left;
  78                 else if (user_call_ID > call->user_call_ID)
  79                         p = p->rb_right;
  80                 else
  81                         goto found_extant_call;
  82         }
  83
  84         read_unlock(&rx->call_lock);
  85         _leave(" = NULL");
  86         return NULL;
  87
  88 found_extant_call:
  89         rxrpc_get_call(call, rxrpc_call_got);
  90         read_unlock(&rx->call_lock);
  91         _leave(" = %p [%d]", call, atomic_read(&call->usage));
  92         return call;
  93 }
  94
  95 /*
  96  * allocate a new call
  97  */
  98 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
  99                                     unsigned int debug_id)
 100 {
 101         struct rxrpc_call *call;
 102         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 103
 104         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 105         if (!call)
 106                 return NULL;
 107
 108         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 109                                     sizeof(struct sk_buff *),
 110                                     gfp);
 111         if (!call->rxtx_buffer)
 112                 goto nomem;
 113
 114         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 115         if (!call->rxtx_annotations)
 116                 goto nomem_2;
 117
 118         mutex_init(&call->user_mutex);
 119
 120         /* Prevent lockdep reporting a deadlock false positive between the afs
 121          * filesystem and sys_sendmsg() via the mmap sem.
 122          */
 123         if (rx->sk.sk_kern_sock)
 124                 lockdep_set_class(&call->user_mutex,
 125                                   &rxrpc_call_user_mutex_lock_class_key);
 126
 127         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 128         INIT_WORK(&call->processor, &rxrpc_process_call);
 129         INIT_LIST_HEAD(&call->link);
 130         INIT_LIST_HEAD(&call->chan_wait_link);
 131         INIT_LIST_HEAD(&call->accept_link);
 132         INIT_LIST_HEAD(&call->recvmsg_link);
 133         INIT_LIST_HEAD(&call->sock_link);
 134         init_waitqueue_head(&call->waitq);
 135         spin_lock_init(&call->lock);
 136         spin_lock_init(&call->notify_lock);
 137         spin_lock_init(&call->input_lock);
 138         rwlock_init(&call->state_lock);
 139         atomic_set(&call->usage, 1);
 140         call->debug_id = debug_id;
 141         call->tx_total_len = -1;
 142         call->next_rx_timo = 20 * HZ;
 143         call->next_req_timo = 1 * HZ;
 144
 145         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 146
 147         /* Leave space in the ring to handle a maxed-out jumbo packet */
 148         call->rx_winsize = rxrpc_rx_window_size;
 149         call->tx_winsize = 16;
 150         call->rx_expect_next = 1;
 151
 152         call->cong_cwnd = 2;
 153         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
 154
 155         call->rxnet = rxnet;
 156         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 157         atomic_inc(&rxnet->nr_calls);
 158         return call;
 159
 160 nomem_2:
 161         kfree(call->rxtx_buffer);
 162 nomem:
 163         kmem_cache_free(rxrpc_call_jar, call);
 164         return NULL;
 165 }
 166
 167 /*
 168  * Allocate a new client call.
 169  */
 170 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 171                                                   struct sockaddr_rxrpc *srx,
 172                                                   gfp_t gfp,
 173                                                   unsigned int debug_id)
 174 {
 175         struct rxrpc_call *call;
 176         ktime_t now;
 177
 178         _enter("");
 179
 180         call = rxrpc_alloc_call(rx, gfp, debug_id);
 181         if (!call)
 182                 return ERR_PTR(-ENOMEM);
 183         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 184         call->service_id = srx->srx_service;
 185         call->tx_phase = true;
 186         now = ktime_get_real();
 187         call->acks_latest_ts = now;
 188         call->cong_tstamp = now;
 189
 190         _leave(" = %p", call);
 191         return call;
 192 }
 193
 194 /*
 195  * Initiate the call ack/resend/expiry timer.
 196  */
 197 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 198 {
 199         unsigned long now = jiffies;
 200         unsigned long j = now + MAX_JIFFY_OFFSET;
 201
 202         call->ack_at = j;
 203         call->ack_lost_at = j;
 204         call->resend_at = j;
 205         call->ping_at = j;
 206         call->expect_rx_by = j;
 207         call->expect_req_by = j;
 208         call->expect_term_by = j;
 209         call->timer.expires = now;
 210 }
 211
 212 /*
 213  * Set up a call for the given parameters.
 214  * - Called with the socket lock held, which it must release.
 215  * - If it returns a call, the call's lock will need releasing by the caller.
 216  */
 217 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 218                                          struct rxrpc_conn_parameters *cp,
 219                                          struct sockaddr_rxrpc *srx,
 220                                          struct rxrpc_call_params *p,
 221                                          gfp_t gfp,
 222                                          unsigned int debug_id)
 223         __releases(&rx->sk.sk_lock.slock)
 224         __acquires(&call->user_mutex)
 225 {
 226         struct rxrpc_call *call, *xcall;
 227         struct rxrpc_net *rxnet;
 228         struct rb_node *parent, **pp;
 229         const void *here = __builtin_return_address(0);
 230         int ret;
 231
 232         _enter("%p,%lx", rx, p->user_call_ID);
 233
 234         call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
 235         if (IS_ERR(call)) {
 236                 release_sock(&rx->sk);
 237                 _leave(" = %ld", PTR_ERR(call));
 238                 return call;
 239         }
 240
 241         call->interruptibility = p->interruptibility;
 242         call->tx_total_len = p->tx_total_len;
 243         trace_rxrpc_call(call->debug_id, rxrpc_call_new_client,
 244                          atomic_read(&call->usage),
 245                          here, (const void *)p->user_call_ID);
 246
 247         /* We need to protect a partially set up call against the user as we
 248          * will be acting outside the socket lock.
 249          */
 250         mutex_lock(&call->user_mutex);
 251
 252         /* Publish the call, even though it is incompletely set up as yet */
 253         write_lock(&rx->call_lock);
 254
 255         pp = &rx->calls.rb_node;
 256         parent = NULL;
 257         while (*pp) {
 258                 parent = *pp;
 259                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 260
 261                 if (p->user_call_ID < xcall->user_call_ID)
 262                         pp = &(*pp)->rb_left;
 263                 else if (p->user_call_ID > xcall->user_call_ID)
 264                         pp = &(*pp)->rb_right;
 265                 else
 266                         goto error_dup_user_ID;
 267         }
 268
 269         rcu_assign_pointer(call->socket, rx);
 270         call->user_call_ID = p->user_call_ID;
 271         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 272         rxrpc_get_call(call, rxrpc_call_got_userid);
 273         rb_link_node(&call->sock_node, parent, pp);
 274         rb_insert_color(&call->sock_node, &rx->calls);
 275         list_add(&call->sock_link, &rx->sock_calls);
 276
 277         write_unlock(&rx->call_lock);
 278
 279         rxnet = call->rxnet;
 280         write_lock(&rxnet->call_lock);
 281         list_add_tail(&call->link, &rxnet->calls);
 282         write_unlock(&rxnet->call_lock);
 283
 284         /* From this point on, the call is protected by its own lock. */
 285         release_sock(&rx->sk);
 286
 287         /* Set up or get a connection record and set the protocol parameters,
 288          * including channel number and call ID.
 289          */
 290         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
 291         if (ret < 0)
 292                 goto error_attached_to_socket;
 293
 294         trace_rxrpc_call(call->debug_id, rxrpc_call_connected,
 295                          atomic_read(&call->usage), here, NULL);
 296
 297         rxrpc_start_call_timer(call);
 298
 299         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 300
 301         _leave(" = %p [new]", call);
 302         return call;
 303
 304         /* We unexpectedly found the user ID in the list after taking
 305          * the call_lock.  This shouldn't happen unless the user races
 306          * with itself and tries to add the same user ID twice at the
 307          * same time in different threads.
 308          */
 309 error_dup_user_ID:
 310         write_unlock(&rx->call_lock);
 311         release_sock(&rx->sk);
 312         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 313                                     RX_CALL_DEAD, -EEXIST);
 314         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 315                          atomic_read(&call->usage), here, ERR_PTR(-EEXIST));
 316         rxrpc_release_call(rx, call);
 317         mutex_unlock(&call->user_mutex);
 318         rxrpc_put_call(call, rxrpc_call_put);
 319         _leave(" = -EEXIST");
 320         return ERR_PTR(-EEXIST);
 321
 322         /* We got an error, but the call is attached to the socket and is in
 323          * need of release.  However, we might now race with recvmsg() when
 324          * completing the call queues it.  Return 0 from sys_sendmsg() and
 325          * leave the error to recvmsg() to deal with.
 326          */
 327 error_attached_to_socket:
 328         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 329                          atomic_read(&call->usage), here, ERR_PTR(ret));
 330         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 331         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 332                                     RX_CALL_DEAD, ret);
 333         _leave(" = c=%08x [err]", call->debug_id);
 334         return call;
 335 }
 336
 337 /*
 338  * Set up an incoming call.  call->conn points to the connection.
 339  * This is called in BH context and isn't allowed to fail.
 340  */
 341 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 342                          struct rxrpc_call *call,
 343                          struct sk_buff *skb)
 344 {
 345         struct rxrpc_connection *conn = call->conn;
 346         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 347         u32 chan;
 348
 349         _enter(",%d", call->conn->debug_id);
 350
 351         rcu_assign_pointer(call->socket, rx);
 352         call->call_id           = sp->hdr.callNumber;
 353         call->service_id        = sp->hdr.serviceId;
 354         call->cid               = sp->hdr.cid;
 355         call->state             = RXRPC_CALL_SERVER_ACCEPTING;
 356         if (sp->hdr.securityIndex > 0)
 357                 call->state     = RXRPC_CALL_SERVER_SECURING;
 358         call->cong_tstamp       = skb->tstamp;
 359
 360         /* Set the channel for this call.  We don't get channel_lock as we're
 361          * only defending against the data_ready handler (which we're called
 362          * from) and the RESPONSE packet parser (which is only really
 363          * interested in call_counter and can cope with a disagreement with the
 364          * call pointer).
 365          */
 366         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 367         conn->channels[chan].call_counter = call->call_id;
 368         conn->channels[chan].call_id = call->call_id;
 369         rcu_assign_pointer(conn->channels[chan].call, call);
 370
 371         spin_lock(&conn->params.peer->lock);
 372         hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
 373         spin_unlock(&conn->params.peer->lock);
 374
 375         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 376
 377         rxrpc_start_call_timer(call);
 378         _leave("");
 379 }
 380
 381 /*
 382  * Queue a call's work processor, getting a ref to pass to the work queue.
 383  */
 384 bool rxrpc_queue_call(struct rxrpc_call *call)
 385 {
 386         const void *here = __builtin_return_address(0);
 387         int n = atomic_fetch_add_unless(&call->usage, 1, 0);
 388         if (n == 0)
 389                 return false;
 390         if (rxrpc_queue_work(&call->processor))
 391                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
 392                                  here, NULL);
 393         else
 394                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 395         return true;
 396 }
 397
 398 /*
 399  * Queue a call's work processor, passing the callers ref to the work queue.
 400  */
 401 bool __rxrpc_queue_call(struct rxrpc_call *call)
 402 {
 403         const void *here = __builtin_return_address(0);
 404         int n = atomic_read(&call->usage);
 405         ASSERTCMP(n, >=, 1);
 406         if (rxrpc_queue_work(&call->processor))
 407                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
 408                                  here, NULL);
 409         else
 410                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 411         return true;
 412 }
 413
 414 /*
 415  * Note the re-emergence of a call.
 416  */
 417 void rxrpc_see_call(struct rxrpc_call *call)
 418 {
 419         const void *here = __builtin_return_address(0);
 420         if (call) {
 421                 int n = atomic_read(&call->usage);
 422
 423                 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
 424                                  here, NULL);
 425         }
 426 }
 427
 428 /*
 429  * Note the addition of a ref on a call.
 430  */
 431 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 432 {
 433         const void *here = __builtin_return_address(0);
 434         int n = atomic_inc_return(&call->usage);
 435
 436         trace_rxrpc_call(call->debug_id, op, n, here, NULL);
 437 }
 438
 439 /*
 440  * Clean up the RxTx skb ring.
 441  */
 442 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 443 {
 444         int i;
 445
 446         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 447                 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
 448                 call->rxtx_buffer[i] = NULL;
 449         }
 450 }
 451
 452 /*
 453  * Detach a call from its owning socket.
 454  */
 455 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 456 {
 457         const void *here = __builtin_return_address(0);
 458         struct rxrpc_connection *conn = call->conn;
 459         bool put = false;
 460
 461         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 462
 463         trace_rxrpc_call(call->debug_id, rxrpc_call_release,
 464                          atomic_read(&call->usage),
 465                          here, (const void *)call->flags);
 466
 467         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 468
 469         spin_lock_bh(&call->lock);
 470         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 471                 BUG();
 472         spin_unlock_bh(&call->lock);
 473
 474         del_timer_sync(&call->timer);
 475
 476         /* Make sure we don't get any more notifications */
 477         write_lock_bh(&rx->recvmsg_lock);
 478
 479         if (!list_empty(&call->recvmsg_link)) {
 480                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 481                        call, call->events, call->flags);
 482                 list_del(&call->recvmsg_link);
 483                 put = true;
 484         }
 485
 486         /* list_empty() must return false in rxrpc_notify_socket() */
 487         call->recvmsg_link.next = NULL;
 488         call->recvmsg_link.prev = NULL;
 489
 490         write_unlock_bh(&rx->recvmsg_lock);
 491         if (put)
 492                 rxrpc_put_call(call, rxrpc_call_put);
 493
 494         write_lock(&rx->call_lock);
 495
 496         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 497                 rb_erase(&call->sock_node, &rx->calls);
 498                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 499                 rxrpc_put_call(call, rxrpc_call_put_userid);
 500         }
 501
 502         list_del(&call->sock_link);
 503         write_unlock(&rx->call_lock);
 504
 505         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 506
 507         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
 508                 rxrpc_disconnect_call(call);
 509         if (call->security)
 510                 call->security->free_call_crypto(call);
 511
 512         rxrpc_cleanup_ring(call);
 513         _leave("");
 514 }
 515
 516 /*
 517  * release all the calls associated with a socket
 518  */
 519 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 520 {
 521         struct rxrpc_call *call;
 522
 523         _enter("%p", rx);
 524
 525         while (!list_empty(&rx->to_be_accepted)) {
 526                 call = list_entry(rx->to_be_accepted.next,
 527                                   struct rxrpc_call, accept_link);
 528                 list_del(&call->accept_link);
 529                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
 530                 rxrpc_put_call(call, rxrpc_call_put);
 531         }
 532
 533         while (!list_empty(&rx->sock_calls)) {
 534                 call = list_entry(rx->sock_calls.next,
 535                                   struct rxrpc_call, sock_link);
 536                 rxrpc_get_call(call, rxrpc_call_got);
 537                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
 538                 rxrpc_send_abort_packet(call);
 539                 rxrpc_release_call(rx, call);
 540                 rxrpc_put_call(call, rxrpc_call_put);
 541         }
 542
 543         _leave("");
 544 }
 545
 546 /*
 547  * release a call
 548  */
 549 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 550 {
 551         struct rxrpc_net *rxnet = call->rxnet;
 552         const void *here = __builtin_return_address(0);
 553         unsigned int debug_id = call->debug_id;
 554         int n;
 555
 556         ASSERT(call != NULL);
 557
 558         n = atomic_dec_return(&call->usage);
 559         trace_rxrpc_call(debug_id, op, n, here, NULL);
 560         ASSERTCMP(n, >=, 0);
 561         if (n == 0) {
 562                 _debug("call %d dead", call->debug_id);
 563                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 564
 565                 if (!list_empty(&call->link)) {
 566                         write_lock(&rxnet->call_lock);
 567                         list_del_init(&call->link);
 568                         write_unlock(&rxnet->call_lock);
 569                 }
 570
 571                 rxrpc_cleanup_call(call);
 572         }
 573 }
 574
 575 /*
 576  * Final call destruction - but must be done in process context.
 577  */
 578 static void rxrpc_destroy_call(struct work_struct *work)
 579 {
 580         struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
 581         struct rxrpc_net *rxnet = call->rxnet;
 582
 583         rxrpc_put_connection(call->conn);
 584         rxrpc_put_peer(call->peer);
 585         kfree(call->rxtx_buffer);
 586         kfree(call->rxtx_annotations);
 587         kmem_cache_free(rxrpc_call_jar, call);
 588         if (atomic_dec_and_test(&rxnet->nr_calls))
 589                 wake_up_var(&rxnet->nr_calls);
 590 }
 591
 592 /*
 593  * Final call destruction under RCU.
 594  */
 595 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 596 {
 597         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 598
 599         if (in_softirq()) {
 600                 INIT_WORK(&call->processor, rxrpc_destroy_call);
 601                 if (!rxrpc_queue_work(&call->processor))
 602                         BUG();
 603         } else {
 604                 rxrpc_destroy_call(&call->processor);
 605         }
 606 }
 607
 608 /*
 609  * clean up a call
 610  */
 611 void rxrpc_cleanup_call(struct rxrpc_call *call)
 612 {
 613         _net("DESTROY CALL %d", call->debug_id);
 614
 615         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 616
 617         del_timer_sync(&call->timer);
 618
 619         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 620         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 621
 622         rxrpc_cleanup_ring(call);
 623         rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned);
 624
 625         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 626 }
 627
 628 /*
 629  * Make sure that all calls are gone from a network namespace.  To reach this
 630  * point, any open UDP sockets in that namespace must have been closed, so any
 631  * outstanding calls cannot be doing I/O.
 632  */
 633 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 634 {
 635         struct rxrpc_call *call;
 636
 637         _enter("");
 638
 639         if (!list_empty(&rxnet->calls)) {
 640                 write_lock(&rxnet->call_lock);
 641
 642                 while (!list_empty(&rxnet->calls)) {
 643                         call = list_entry(rxnet->calls.next,
 644                                           struct rxrpc_call, link);
 645                         _debug("Zapping call %p", call);
 646
 647                         rxrpc_see_call(call);
 648                         list_del_init(&call->link);
 649
 650                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 651                                call, atomic_read(&call->usage),
 652                                rxrpc_call_states[call->state],
 653                                call->flags, call->events);
 654
 655                         write_unlock(&rxnet->call_lock);
 656                         cond_resched();
 657                         write_lock(&rxnet->call_lock);
 658                 }
 659
 660                 write_unlock(&rxnet->call_lock);
 661         }
 662
 663         atomic_dec(&rxnet->nr_calls);
 664         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 665 }