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 ([email protected])
   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_RECV_REQUEST]        = "SvRcvReq",
  26         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
  27         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
  28         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
  29         [RXRPC_CALL_COMPLETE]                   = "Complete",
  30 };
  31
  32 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
  33         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
  34         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
  35         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
  36         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
  37         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
  38 };
  39
  40 struct kmem_cache *rxrpc_call_jar;
  41
  42 static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
  43 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
  44
  45 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
  46 {
  47         struct rxrpc_local *local = call->local;
  48         bool busy;
  49
  50         if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
  51                 spin_lock_irq(&local->lock);
  52                 busy = !list_empty(&call->attend_link);
  53                 trace_rxrpc_poke_call(call, busy, what);
  54                 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
  55                         busy = true;
  56                 if (!busy) {
  57                         list_add_tail(&call->attend_link, &local->call_attend_q);
  58                 }
  59                 spin_unlock_irq(&local->lock);
  60                 if (!busy)
  61                         rxrpc_wake_up_io_thread(local);
  62         }
  63 }
  64
  65 static void rxrpc_call_timer_expired(struct timer_list *t)
  66 {
  67         struct rxrpc_call *call = from_timer(call, t, timer);
  68
  69         _enter("%d", call->debug_id);
  70
  71         if (!__rxrpc_call_is_complete(call)) {
  72                 trace_rxrpc_timer_expired(call);
  73                 rxrpc_poke_call(call, rxrpc_call_poke_timer);
  74         }
  75 }
  76
  77 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  78
  79 static void rxrpc_destroy_call(struct work_struct *);
  80
  81 /*
  82  * find an extant server call
  83  * - called in process context with IRQs enabled
  84  */
  85 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  86                                               unsigned long user_call_ID)
  87 {
  88         struct rxrpc_call *call;
  89         struct rb_node *p;
  90
  91         _enter("%p,%lx", rx, user_call_ID);
  92
  93         read_lock(&rx->call_lock);
  94
  95         p = rx->calls.rb_node;
  96         while (p) {
  97                 call = rb_entry(p, struct rxrpc_call, sock_node);
  98
  99                 if (user_call_ID < call->user_call_ID)
 100                         p = p->rb_left;
 101                 else if (user_call_ID > call->user_call_ID)
 102                         p = p->rb_right;
 103                 else
 104                         goto found_extant_call;
 105         }
 106
 107         read_unlock(&rx->call_lock);
 108         _leave(" = NULL");
 109         return NULL;
 110
 111 found_extant_call:
 112         rxrpc_get_call(call, rxrpc_call_get_sendmsg);
 113         read_unlock(&rx->call_lock);
 114         _leave(" = %p [%d]", call, refcount_read(&call->ref));
 115         return call;
 116 }
 117
 118 /*
 119  * allocate a new call
 120  */
 121 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 122                                     unsigned int debug_id)
 123 {
 124         struct rxrpc_call *call;
 125         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 126
 127         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 128         if (!call)
 129                 return NULL;
 130
 131         mutex_init(&call->user_mutex);
 132
 133         /* Prevent lockdep reporting a deadlock false positive between the afs
 134          * filesystem and sys_sendmsg() via the mmap sem.
 135          */
 136         if (rx->sk.sk_kern_sock)
 137                 lockdep_set_class(&call->user_mutex,
 138                                   &rxrpc_call_user_mutex_lock_class_key);
 139
 140         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 141         INIT_WORK(&call->destroyer, rxrpc_destroy_call);
 142         INIT_LIST_HEAD(&call->link);
 143         INIT_LIST_HEAD(&call->wait_link);
 144         INIT_LIST_HEAD(&call->accept_link);
 145         INIT_LIST_HEAD(&call->recvmsg_link);
 146         INIT_LIST_HEAD(&call->sock_link);
 147         INIT_LIST_HEAD(&call->attend_link);
 148         skb_queue_head_init(&call->rx_queue);
 149         skb_queue_head_init(&call->recvmsg_queue);
 150         skb_queue_head_init(&call->rx_oos_queue);
 151         init_waitqueue_head(&call->waitq);
 152         spin_lock_init(&call->notify_lock);
 153         refcount_set(&call->ref, 1);
 154         call->debug_id          = debug_id;
 155         call->tx_total_len      = -1;
 156         call->tx_jumbo_max      = 1;
 157         call->next_rx_timo      = 20 * HZ;
 158         call->next_req_timo     = 1 * HZ;
 159         call->ackr_window       = 1;
 160         call->ackr_wtop         = 1;
 161         call->delay_ack_at      = KTIME_MAX;
 162         call->rack_timo_at      = KTIME_MAX;
 163         call->ping_at           = KTIME_MAX;
 164         call->keepalive_at      = KTIME_MAX;
 165         call->expect_rx_by      = KTIME_MAX;
 166         call->expect_req_by     = KTIME_MAX;
 167         call->expect_term_by    = KTIME_MAX;
 168
 169         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 170
 171         call->rx_winsize = rxrpc_rx_window_size;
 172         call->tx_winsize = 16;
 173
 174         call->cong_cwnd = RXRPC_MIN_CWND;
 175         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 176
 177         rxrpc_call_init_rtt(call);
 178
 179         call->rxnet = rxnet;
 180         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 181         atomic_inc(&rxnet->nr_calls);
 182         return call;
 183 }
 184
 185 /*
 186  * Allocate a new client call.
 187  */
 188 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 189                                                   struct rxrpc_conn_parameters *cp,
 190                                                   struct rxrpc_call_params *p,
 191                                                   gfp_t gfp,
 192                                                   unsigned int debug_id)
 193 {
 194         struct rxrpc_call *call;
 195         ktime_t now;
 196         int ret;
 197
 198         _enter("");
 199
 200         call = rxrpc_alloc_call(rx, gfp, debug_id);
 201         if (!call)
 202                 return ERR_PTR(-ENOMEM);
 203         now = ktime_get_real();
 204         call->acks_latest_ts    = now;
 205         call->cong_tstamp       = now;
 206         call->dest_srx          = cp->peer->srx;
 207         call->dest_srx.srx_service = cp->service_id;
 208         call->interruptibility  = p->interruptibility;
 209         call->tx_total_len      = p->tx_total_len;
 210         call->key               = key_get(cp->key);
 211         call->peer              = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
 212         call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
 213         call->security_level    = cp->security_level;
 214         if (p->kernel)
 215                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 216         if (cp->upgrade)
 217                 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
 218         if (cp->exclusive)
 219                 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 220
 221         if (p->timeouts.normal)
 222                 call->next_rx_timo = umin(p->timeouts.normal, 1);
 223         if (p->timeouts.idle)
 224                 call->next_req_timo = umin(p->timeouts.idle, 1);
 225         if (p->timeouts.hard)
 226                 call->hard_timo = p->timeouts.hard;
 227
 228         ret = rxrpc_init_client_call_security(call);
 229         if (ret < 0) {
 230                 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
 231                 rxrpc_put_call(call, rxrpc_call_put_discard_error);
 232                 return ERR_PTR(ret);
 233         }
 234
 235         rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
 236
 237         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 238                          p->user_call_ID, rxrpc_call_new_client);
 239
 240         _leave(" = %p", call);
 241         return call;
 242 }
 243
 244 /*
 245  * Initiate the call ack/resend/expiry timer.
 246  */
 247 void rxrpc_start_call_timer(struct rxrpc_call *call)
 248 {
 249         if (call->hard_timo) {
 250                 ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
 251
 252                 call->expect_term_by = ktime_add(ktime_get_real(), delay);
 253                 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
 254         }
 255         call->timer.expires = jiffies;
 256 }
 257
 258 /*
 259  * Wait for a call slot to become available.
 260  */
 261 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 262 {
 263         struct semaphore *limiter = &rxrpc_call_limiter;
 264
 265         if (p->kernel)
 266                 limiter = &rxrpc_kernel_call_limiter;
 267         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 268                 down(limiter);
 269                 return limiter;
 270         }
 271         return down_interruptible(limiter) < 0 ? NULL : limiter;
 272 }
 273
 274 /*
 275  * Release a call slot.
 276  */
 277 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 278 {
 279         struct semaphore *limiter = &rxrpc_call_limiter;
 280
 281         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 282                 limiter = &rxrpc_kernel_call_limiter;
 283         up(limiter);
 284 }
 285
 286 /*
 287  * Start the process of connecting a call.  We obtain a peer and a connection
 288  * bundle, but the actual association of a call with a connection is offloaded
 289  * to the I/O thread to simplify locking.
 290  */
 291 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 292 {
 293         struct rxrpc_local *local = call->local;
 294         int ret = -ENOMEM;
 295
 296         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 297
 298         ret = rxrpc_look_up_bundle(call, gfp);
 299         if (ret < 0)
 300                 goto error;
 301
 302         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 303         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 304         spin_lock_irq(&local->client_call_lock);
 305         list_add_tail(&call->wait_link, &local->new_client_calls);
 306         spin_unlock_irq(&local->client_call_lock);
 307         rxrpc_wake_up_io_thread(local);
 308         return 0;
 309
 310 error:
 311         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 312         return ret;
 313 }
 314
 315 /*
 316  * Set up a call for the given parameters.
 317  * - Called with the socket lock held, which it must release.
 318  * - If it returns a call, the call's lock will need releasing by the caller.
 319  */
 320 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 321                                          struct rxrpc_conn_parameters *cp,
 322                                          struct rxrpc_call_params *p,
 323                                          gfp_t gfp,
 324                                          unsigned int debug_id)
 325         __releases(&rx->sk.sk_lock.slock)
 326         __acquires(&call->user_mutex)
 327 {
 328         struct rxrpc_call *call, *xcall;
 329         struct rxrpc_net *rxnet;
 330         struct semaphore *limiter;
 331         struct rb_node *parent, **pp;
 332         int ret;
 333
 334         _enter("%p,%lx", rx, p->user_call_ID);
 335
 336         if (WARN_ON_ONCE(!cp->peer)) {
 337                 release_sock(&rx->sk);
 338                 return ERR_PTR(-EIO);
 339         }
 340
 341         limiter = rxrpc_get_call_slot(p, gfp);
 342         if (!limiter) {
 343                 release_sock(&rx->sk);
 344                 return ERR_PTR(-ERESTARTSYS);
 345         }
 346
 347         call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
 348         if (IS_ERR(call)) {
 349                 release_sock(&rx->sk);
 350                 up(limiter);
 351                 _leave(" = %ld", PTR_ERR(call));
 352                 return call;
 353         }
 354
 355         /* We need to protect a partially set up call against the user as we
 356          * will be acting outside the socket lock.
 357          */
 358         mutex_lock(&call->user_mutex);
 359
 360         /* Publish the call, even though it is incompletely set up as yet */
 361         write_lock(&rx->call_lock);
 362
 363         pp = &rx->calls.rb_node;
 364         parent = NULL;
 365         while (*pp) {
 366                 parent = *pp;
 367                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 368
 369                 if (p->user_call_ID < xcall->user_call_ID)
 370                         pp = &(*pp)->rb_left;
 371                 else if (p->user_call_ID > xcall->user_call_ID)
 372                         pp = &(*pp)->rb_right;
 373                 else
 374                         goto error_dup_user_ID;
 375         }
 376
 377         rcu_assign_pointer(call->socket, rx);
 378         call->user_call_ID = p->user_call_ID;
 379         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 380         rxrpc_get_call(call, rxrpc_call_get_userid);
 381         rb_link_node(&call->sock_node, parent, pp);
 382         rb_insert_color(&call->sock_node, &rx->calls);
 383         list_add(&call->sock_link, &rx->sock_calls);
 384
 385         write_unlock(&rx->call_lock);
 386
 387         rxnet = call->rxnet;
 388         spin_lock(&rxnet->call_lock);
 389         list_add_tail_rcu(&call->link, &rxnet->calls);
 390         spin_unlock(&rxnet->call_lock);
 391
 392         /* From this point on, the call is protected by its own lock. */
 393         release_sock(&rx->sk);
 394
 395         /* Set up or get a connection record and set the protocol parameters,
 396          * including channel number and call ID.
 397          */
 398         ret = rxrpc_connect_call(call, gfp);
 399         if (ret < 0)
 400                 goto error_attached_to_socket;
 401
 402         _leave(" = %p [new]", call);
 403         return call;
 404
 405         /* We unexpectedly found the user ID in the list after taking
 406          * the call_lock.  This shouldn't happen unless the user races
 407          * with itself and tries to add the same user ID twice at the
 408          * same time in different threads.
 409          */
 410 error_dup_user_ID:
 411         write_unlock(&rx->call_lock);
 412         release_sock(&rx->sk);
 413         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 414         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 415                          rxrpc_call_see_userid_exists);
 416         mutex_unlock(&call->user_mutex);
 417         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 418         _leave(" = -EEXIST");
 419         return ERR_PTR(-EEXIST);
 420
 421         /* We got an error, but the call is attached to the socket and is in
 422          * need of release.  However, we might now race with recvmsg() when it
 423          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 424          * leave the error to recvmsg() to deal with.
 425          */
 426 error_attached_to_socket:
 427         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 428                          rxrpc_call_see_connect_failed);
 429         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 430         _leave(" = c=%08x [err]", call->debug_id);
 431         return call;
 432 }
 433
 434 /*
 435  * Set up an incoming call.  call->conn points to the connection.
 436  * This is called with interrupts disabled and isn't allowed to fail.
 437  */
 438 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 439                          struct rxrpc_call *call,
 440                          struct sk_buff *skb)
 441 {
 442         struct rxrpc_connection *conn = call->conn;
 443         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 444         u32 chan;
 445
 446         _enter(",%d", call->conn->debug_id);
 447
 448         rcu_assign_pointer(call->socket, rx);
 449         call->call_id           = sp->hdr.callNumber;
 450         call->dest_srx.srx_service = sp->hdr.serviceId;
 451         call->cid               = sp->hdr.cid;
 452         call->cong_tstamp       = skb->tstamp;
 453
 454         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 455         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 456
 457         spin_lock(&conn->state_lock);
 458
 459         switch (conn->state) {
 460         case RXRPC_CONN_SERVICE_UNSECURED:
 461         case RXRPC_CONN_SERVICE_CHALLENGING:
 462                 __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
 463                 break;
 464         case RXRPC_CONN_SERVICE:
 465                 break;
 466
 467         case RXRPC_CONN_ABORTED:
 468                 rxrpc_set_call_completion(call, conn->completion,
 469                                           conn->abort_code, conn->error);
 470                 break;
 471         default:
 472                 BUG();
 473         }
 474
 475         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 476
 477         /* Set the channel for this call.  We don't get channel_lock as we're
 478          * only defending against the data_ready handler (which we're called
 479          * from) and the RESPONSE packet parser (which is only really
 480          * interested in call_counter and can cope with a disagreement with the
 481          * call pointer).
 482          */
 483         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 484         conn->channels[chan].call_counter = call->call_id;
 485         conn->channels[chan].call_id = call->call_id;
 486         conn->channels[chan].call = call;
 487         spin_unlock(&conn->state_lock);
 488
 489         spin_lock(&conn->peer->lock);
 490         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 491         spin_unlock(&conn->peer->lock);
 492
 493         rxrpc_start_call_timer(call);
 494         _leave("");
 495 }
 496
 497 /*
 498  * Note the re-emergence of a call.
 499  */
 500 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 501 {
 502         if (call) {
 503                 int r = refcount_read(&call->ref);
 504
 505                 trace_rxrpc_call(call->debug_id, r, 0, why);
 506         }
 507 }
 508
 509 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 510                                       enum rxrpc_call_trace why)
 511 {
 512         int r;
 513
 514         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 515                 return NULL;
 516         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 517         return call;
 518 }
 519
 520 /*
 521  * Note the addition of a ref on a call.
 522  */
 523 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 524 {
 525         int r;
 526
 527         __refcount_inc(&call->ref, &r);
 528         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 529 }
 530
 531 /*
 532  * Clean up the transmission buffers.
 533  */
 534 static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call)
 535 {
 536         struct rxrpc_txqueue *tq, *next;
 537
 538         for (tq = call->tx_queue; tq; tq = next) {
 539                 next = tq->next;
 540                 for (int i = 0; i < RXRPC_NR_TXQUEUE; i++)
 541                         if (tq->bufs[i])
 542                                 rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned);
 543                 trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned);
 544                 kfree(tq);
 545         }
 546 }
 547
 548 /*
 549  * Clean up the receive buffers.
 550  */
 551 static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call)
 552 {
 553         rxrpc_purge_queue(&call->recvmsg_queue);
 554         rxrpc_purge_queue(&call->rx_queue);
 555         rxrpc_purge_queue(&call->rx_oos_queue);
 556 }
 557
 558 /*
 559  * Detach a call from its owning socket.
 560  */
 561 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 562 {
 563         struct rxrpc_connection *conn = call->conn;
 564         bool put = false, putu = false;
 565
 566         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 567
 568         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 569                          call->flags, rxrpc_call_see_release);
 570
 571         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 572                 BUG();
 573
 574         rxrpc_put_call_slot(call);
 575
 576         /* Make sure we don't get any more notifications */
 577         spin_lock_irq(&rx->recvmsg_lock);
 578
 579         if (!list_empty(&call->recvmsg_link)) {
 580                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 581                        call, call->events, call->flags);
 582                 list_del(&call->recvmsg_link);
 583                 put = true;
 584         }
 585
 586         /* list_empty() must return false in rxrpc_notify_socket() */
 587         call->recvmsg_link.next = NULL;
 588         call->recvmsg_link.prev = NULL;
 589
 590         spin_unlock_irq(&rx->recvmsg_lock);
 591         if (put)
 592                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 593
 594         write_lock(&rx->call_lock);
 595
 596         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 597                 rb_erase(&call->sock_node, &rx->calls);
 598                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 599                 putu = true;
 600         }
 601
 602         list_del(&call->sock_link);
 603         write_unlock(&rx->call_lock);
 604
 605         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 606
 607         if (putu)
 608                 rxrpc_put_call(call, rxrpc_call_put_userid);
 609
 610         _leave("");
 611 }
 612
 613 /*
 614  * release all the calls associated with a socket
 615  */
 616 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 617 {
 618         struct rxrpc_call *call;
 619
 620         _enter("%p", rx);
 621
 622         while (!list_empty(&rx->to_be_accepted)) {
 623                 call = list_entry(rx->to_be_accepted.next,
 624                                   struct rxrpc_call, accept_link);
 625                 list_del(&call->accept_link);
 626                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 627                                     rxrpc_abort_call_sock_release_tba);
 628                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 629         }
 630
 631         while (!list_empty(&rx->sock_calls)) {
 632                 call = list_entry(rx->sock_calls.next,
 633                                   struct rxrpc_call, sock_link);
 634                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 635                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 636                                     rxrpc_abort_call_sock_release);
 637                 rxrpc_release_call(rx, call);
 638                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 639         }
 640
 641         _leave("");
 642 }
 643
 644 /*
 645  * release a call
 646  */
 647 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 648 {
 649         struct rxrpc_net *rxnet = call->rxnet;
 650         unsigned int debug_id = call->debug_id;
 651         bool dead;
 652         int r;
 653
 654         ASSERT(call != NULL);
 655
 656         dead = __refcount_dec_and_test(&call->ref, &r);
 657         trace_rxrpc_call(debug_id, r - 1, 0, why);
 658         if (dead) {
 659                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 660
 661                 if (!list_empty(&call->link)) {
 662                         spin_lock(&rxnet->call_lock);
 663                         list_del_init(&call->link);
 664                         spin_unlock(&rxnet->call_lock);
 665                 }
 666
 667                 rxrpc_cleanup_call(call);
 668         }
 669 }
 670
 671 /*
 672  * Free up the call under RCU.
 673  */
 674 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 675 {
 676         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 677         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 678
 679         kmem_cache_free(rxrpc_call_jar, call);
 680         if (atomic_dec_and_test(&rxnet->nr_calls))
 681                 wake_up_var(&rxnet->nr_calls);
 682 }
 683
 684 /*
 685  * Final call destruction - but must be done in process context.
 686  */
 687 static void rxrpc_destroy_call(struct work_struct *work)
 688 {
 689         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 690
 691         del_timer_sync(&call->timer);
 692
 693         rxrpc_cleanup_tx_buffers(call);
 694         rxrpc_cleanup_rx_buffers(call);
 695         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 696         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 697         rxrpc_deactivate_bundle(call->bundle);
 698         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 699         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 700         rxrpc_put_local(call->local, rxrpc_local_put_call);
 701         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 702 }
 703
 704 /*
 705  * clean up a call
 706  */
 707 void rxrpc_cleanup_call(struct rxrpc_call *call)
 708 {
 709         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 710
 711         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 712         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 713
 714         del_timer(&call->timer);
 715
 716         if (rcu_read_lock_held())
 717                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 718                  * something that may be running/waiting there.
 719                  */
 720                 schedule_work(&call->destroyer);
 721         else
 722                 rxrpc_destroy_call(&call->destroyer);
 723 }
 724
 725 /*
 726  * Make sure that all calls are gone from a network namespace.  To reach this
 727  * point, any open UDP sockets in that namespace must have been closed, so any
 728  * outstanding calls cannot be doing I/O.
 729  */
 730 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 731 {
 732         struct rxrpc_call *call;
 733
 734         _enter("");
 735
 736         if (!list_empty(&rxnet->calls)) {
 737                 spin_lock(&rxnet->call_lock);
 738
 739                 while (!list_empty(&rxnet->calls)) {
 740                         call = list_entry(rxnet->calls.next,
 741                                           struct rxrpc_call, link);
 742                         _debug("Zapping call %p", call);
 743
 744                         rxrpc_see_call(call, rxrpc_call_see_zap);
 745                         list_del_init(&call->link);
 746
 747                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 748                                call, refcount_read(&call->ref),
 749                                rxrpc_call_states[__rxrpc_call_state(call)],
 750                                call->flags, call->events);
 751
 752                         spin_unlock(&rxnet->call_lock);
 753                         cond_resched();
 754                         spin_lock(&rxnet->call_lock);
 755                 }
 756
 757                 spin_unlock(&rxnet->call_lock);
 758         }
 759
 760         atomic_dec(&rxnet->nr_calls);
 761         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 762 }