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 DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
  44 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
  45
  46 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
  47 {
  48         struct rxrpc_local *local = call->local;
  49         bool busy;
  50
  51         if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
  52                 spin_lock_bh(&local->lock);
  53                 busy = !list_empty(&call->attend_link);
  54                 trace_rxrpc_poke_call(call, busy, what);
  55                 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
  56                         busy = true;
  57                 if (!busy) {
  58                         list_add_tail(&call->attend_link, &local->call_attend_q);
  59                 }
  60                 spin_unlock_bh(&local->lock);
  61                 if (!busy)
  62                         rxrpc_wake_up_io_thread(local);
  63         }
  64 }
  65
  66 static void rxrpc_call_timer_expired(struct timer_list *t)
  67 {
  68         struct rxrpc_call *call = from_timer(call, t, timer);
  69
  70         _enter("%d", call->debug_id);
  71
  72         if (!__rxrpc_call_is_complete(call)) {
  73                 trace_rxrpc_timer_expired(call, jiffies);
  74                 rxrpc_poke_call(call, rxrpc_call_poke_timer);
  75         }
  76 }
  77
  78 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
  79                              unsigned long expire_at,
  80                              unsigned long now,
  81                              enum rxrpc_timer_trace why)
  82 {
  83         trace_rxrpc_timer(call, why, now);
  84         timer_reduce(&call->timer, expire_at);
  85 }
  86
  87 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  88
  89 static void rxrpc_destroy_call(struct work_struct *);
  90
  91 /*
  92  * find an extant server call
  93  * - called in process context with IRQs enabled
  94  */
  95 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  96                                               unsigned long user_call_ID)
  97 {
  98         struct rxrpc_call *call;
  99         struct rb_node *p;
 100
 101         _enter("%p,%lx", rx, user_call_ID);
 102
 103         read_lock(&rx->call_lock);
 104
 105         p = rx->calls.rb_node;
 106         while (p) {
 107                 call = rb_entry(p, struct rxrpc_call, sock_node);
 108
 109                 if (user_call_ID < call->user_call_ID)
 110                         p = p->rb_left;
 111                 else if (user_call_ID > call->user_call_ID)
 112                         p = p->rb_right;
 113                 else
 114                         goto found_extant_call;
 115         }
 116
 117         read_unlock(&rx->call_lock);
 118         _leave(" = NULL");
 119         return NULL;
 120
 121 found_extant_call:
 122         rxrpc_get_call(call, rxrpc_call_get_sendmsg);
 123         read_unlock(&rx->call_lock);
 124         _leave(" = %p [%d]", call, refcount_read(&call->ref));
 125         return call;
 126 }
 127
 128 /*
 129  * allocate a new call
 130  */
 131 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 132                                     unsigned int debug_id)
 133 {
 134         struct rxrpc_call *call;
 135         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 136
 137         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 138         if (!call)
 139                 return NULL;
 140
 141         mutex_init(&call->user_mutex);
 142
 143         /* Prevent lockdep reporting a deadlock false positive between the afs
 144          * filesystem and sys_sendmsg() via the mmap sem.
 145          */
 146         if (rx->sk.sk_kern_sock)
 147                 lockdep_set_class(&call->user_mutex,
 148                                   &rxrpc_call_user_mutex_lock_class_key);
 149
 150         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 151         INIT_WORK(&call->destroyer, rxrpc_destroy_call);
 152         INIT_LIST_HEAD(&call->link);
 153         INIT_LIST_HEAD(&call->wait_link);
 154         INIT_LIST_HEAD(&call->accept_link);
 155         INIT_LIST_HEAD(&call->recvmsg_link);
 156         INIT_LIST_HEAD(&call->sock_link);
 157         INIT_LIST_HEAD(&call->attend_link);
 158         INIT_LIST_HEAD(&call->tx_sendmsg);
 159         INIT_LIST_HEAD(&call->tx_buffer);
 160         skb_queue_head_init(&call->recvmsg_queue);
 161         skb_queue_head_init(&call->rx_oos_queue);
 162         init_waitqueue_head(&call->waitq);
 163         spin_lock_init(&call->notify_lock);
 164         spin_lock_init(&call->tx_lock);
 165         refcount_set(&call->ref, 1);
 166         call->debug_id = debug_id;
 167         call->tx_total_len = -1;
 168         call->next_rx_timo = 20 * HZ;
 169         call->next_req_timo = 1 * HZ;
 170         call->ackr_window = 1;
 171         call->ackr_wtop = 1;
 172
 173         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 174
 175         call->rx_winsize = rxrpc_rx_window_size;
 176         call->tx_winsize = 16;
 177
 178         if (RXRPC_TX_SMSS > 2190)
 179                 call->cong_cwnd = 2;
 180         else if (RXRPC_TX_SMSS > 1095)
 181                 call->cong_cwnd = 3;
 182         else
 183                 call->cong_cwnd = 4;
 184         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 185
 186         call->rxnet = rxnet;
 187         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 188         atomic_inc(&rxnet->nr_calls);
 189         return call;
 190 }
 191
 192 /*
 193  * Allocate a new client call.
 194  */
 195 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 196                                                   struct rxrpc_conn_parameters *cp,
 197                                                   struct rxrpc_call_params *p,
 198                                                   gfp_t gfp,
 199                                                   unsigned int debug_id)
 200 {
 201         struct rxrpc_call *call;
 202         ktime_t now;
 203         int ret;
 204
 205         _enter("");
 206
 207         call = rxrpc_alloc_call(rx, gfp, debug_id);
 208         if (!call)
 209                 return ERR_PTR(-ENOMEM);
 210         now = ktime_get_real();
 211         call->acks_latest_ts    = now;
 212         call->cong_tstamp       = now;
 213         call->dest_srx          = cp->peer->srx;
 214         call->dest_srx.srx_service = cp->service_id;
 215         call->interruptibility  = p->interruptibility;
 216         call->tx_total_len      = p->tx_total_len;
 217         call->key               = key_get(cp->key);
 218         call->peer              = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
 219         call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
 220         call->security_level    = cp->security_level;
 221         if (p->kernel)
 222                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 223         if (cp->upgrade)
 224                 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
 225         if (cp->exclusive)
 226                 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 227
 228         if (p->timeouts.normal)
 229                 call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL);
 230         if (p->timeouts.idle)
 231                 call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL);
 232         if (p->timeouts.hard)
 233                 call->hard_timo = p->timeouts.hard * HZ;
 234
 235         ret = rxrpc_init_client_call_security(call);
 236         if (ret < 0) {
 237                 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
 238                 rxrpc_put_call(call, rxrpc_call_put_discard_error);
 239                 return ERR_PTR(ret);
 240         }
 241
 242         rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
 243
 244         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 245                          p->user_call_ID, rxrpc_call_new_client);
 246
 247         _leave(" = %p", call);
 248         return call;
 249 }
 250
 251 /*
 252  * Initiate the call ack/resend/expiry timer.
 253  */
 254 void rxrpc_start_call_timer(struct rxrpc_call *call)
 255 {
 256         unsigned long now = jiffies;
 257         unsigned long j = now + MAX_JIFFY_OFFSET;
 258
 259         call->delay_ack_at = j;
 260         call->ack_lost_at = j;
 261         call->resend_at = j;
 262         call->ping_at = j;
 263         call->keepalive_at = j;
 264         call->expect_rx_by = j;
 265         call->expect_req_by = j;
 266         call->expect_term_by = j + call->hard_timo;
 267         call->timer.expires = now;
 268 }
 269
 270 /*
 271  * Wait for a call slot to become available.
 272  */
 273 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 274 {
 275         struct semaphore *limiter = &rxrpc_call_limiter;
 276
 277         if (p->kernel)
 278                 limiter = &rxrpc_kernel_call_limiter;
 279         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 280                 down(limiter);
 281                 return limiter;
 282         }
 283         return down_interruptible(limiter) < 0 ? NULL : limiter;
 284 }
 285
 286 /*
 287  * Release a call slot.
 288  */
 289 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 290 {
 291         struct semaphore *limiter = &rxrpc_call_limiter;
 292
 293         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 294                 limiter = &rxrpc_kernel_call_limiter;
 295         up(limiter);
 296 }
 297
 298 /*
 299  * Start the process of connecting a call.  We obtain a peer and a connection
 300  * bundle, but the actual association of a call with a connection is offloaded
 301  * to the I/O thread to simplify locking.
 302  */
 303 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 304 {
 305         struct rxrpc_local *local = call->local;
 306         int ret = -ENOMEM;
 307
 308         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 309
 310         ret = rxrpc_look_up_bundle(call, gfp);
 311         if (ret < 0)
 312                 goto error;
 313
 314         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 315         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 316         spin_lock(&local->client_call_lock);
 317         list_add_tail(&call->wait_link, &local->new_client_calls);
 318         spin_unlock(&local->client_call_lock);
 319         rxrpc_wake_up_io_thread(local);
 320         return 0;
 321
 322 error:
 323         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 324         return ret;
 325 }
 326
 327 /*
 328  * Set up a call for the given parameters.
 329  * - Called with the socket lock held, which it must release.
 330  * - If it returns a call, the call's lock will need releasing by the caller.
 331  */
 332 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 333                                          struct rxrpc_conn_parameters *cp,
 334                                          struct rxrpc_call_params *p,
 335                                          gfp_t gfp,
 336                                          unsigned int debug_id)
 337         __releases(&rx->sk.sk_lock.slock)
 338         __acquires(&call->user_mutex)
 339 {
 340         struct rxrpc_call *call, *xcall;
 341         struct rxrpc_net *rxnet;
 342         struct semaphore *limiter;
 343         struct rb_node *parent, **pp;
 344         int ret;
 345
 346         _enter("%p,%lx", rx, p->user_call_ID);
 347
 348         if (WARN_ON_ONCE(!cp->peer)) {
 349                 release_sock(&rx->sk);
 350                 return ERR_PTR(-EIO);
 351         }
 352
 353         limiter = rxrpc_get_call_slot(p, gfp);
 354         if (!limiter) {
 355                 release_sock(&rx->sk);
 356                 return ERR_PTR(-ERESTARTSYS);
 357         }
 358
 359         call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
 360         if (IS_ERR(call)) {
 361                 release_sock(&rx->sk);
 362                 up(limiter);
 363                 _leave(" = %ld", PTR_ERR(call));
 364                 return call;
 365         }
 366
 367         /* We need to protect a partially set up call against the user as we
 368          * will be acting outside the socket lock.
 369          */
 370         mutex_lock(&call->user_mutex);
 371
 372         /* Publish the call, even though it is incompletely set up as yet */
 373         write_lock(&rx->call_lock);
 374
 375         pp = &rx->calls.rb_node;
 376         parent = NULL;
 377         while (*pp) {
 378                 parent = *pp;
 379                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 380
 381                 if (p->user_call_ID < xcall->user_call_ID)
 382                         pp = &(*pp)->rb_left;
 383                 else if (p->user_call_ID > xcall->user_call_ID)
 384                         pp = &(*pp)->rb_right;
 385                 else
 386                         goto error_dup_user_ID;
 387         }
 388
 389         rcu_assign_pointer(call->socket, rx);
 390         call->user_call_ID = p->user_call_ID;
 391         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 392         rxrpc_get_call(call, rxrpc_call_get_userid);
 393         rb_link_node(&call->sock_node, parent, pp);
 394         rb_insert_color(&call->sock_node, &rx->calls);
 395         list_add(&call->sock_link, &rx->sock_calls);
 396
 397         write_unlock(&rx->call_lock);
 398
 399         rxnet = call->rxnet;
 400         spin_lock(&rxnet->call_lock);
 401         list_add_tail_rcu(&call->link, &rxnet->calls);
 402         spin_unlock(&rxnet->call_lock);
 403
 404         /* From this point on, the call is protected by its own lock. */
 405         release_sock(&rx->sk);
 406
 407         /* Set up or get a connection record and set the protocol parameters,
 408          * including channel number and call ID.
 409          */
 410         ret = rxrpc_connect_call(call, gfp);
 411         if (ret < 0)
 412                 goto error_attached_to_socket;
 413
 414         _leave(" = %p [new]", call);
 415         return call;
 416
 417         /* We unexpectedly found the user ID in the list after taking
 418          * the call_lock.  This shouldn't happen unless the user races
 419          * with itself and tries to add the same user ID twice at the
 420          * same time in different threads.
 421          */
 422 error_dup_user_ID:
 423         write_unlock(&rx->call_lock);
 424         release_sock(&rx->sk);
 425         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 426         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 427                          rxrpc_call_see_userid_exists);
 428         mutex_unlock(&call->user_mutex);
 429         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 430         _leave(" = -EEXIST");
 431         return ERR_PTR(-EEXIST);
 432
 433         /* We got an error, but the call is attached to the socket and is in
 434          * need of release.  However, we might now race with recvmsg() when it
 435          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 436          * leave the error to recvmsg() to deal with.
 437          */
 438 error_attached_to_socket:
 439         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 440                          rxrpc_call_see_connect_failed);
 441         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 442         _leave(" = c=%08x [err]", call->debug_id);
 443         return call;
 444 }
 445
 446 /*
 447  * Set up an incoming call.  call->conn points to the connection.
 448  * This is called in BH context and isn't allowed to fail.
 449  */
 450 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 451                          struct rxrpc_call *call,
 452                          struct sk_buff *skb)
 453 {
 454         struct rxrpc_connection *conn = call->conn;
 455         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 456         u32 chan;
 457
 458         _enter(",%d", call->conn->debug_id);
 459
 460         rcu_assign_pointer(call->socket, rx);
 461         call->call_id           = sp->hdr.callNumber;
 462         call->dest_srx.srx_service = sp->hdr.serviceId;
 463         call->cid               = sp->hdr.cid;
 464         call->cong_tstamp       = skb->tstamp;
 465
 466         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 467         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 468
 469         spin_lock(&conn->state_lock);
 470
 471         switch (conn->state) {
 472         case RXRPC_CONN_SERVICE_UNSECURED:
 473         case RXRPC_CONN_SERVICE_CHALLENGING:
 474                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 475                 break;
 476         case RXRPC_CONN_SERVICE:
 477                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 478                 break;
 479
 480         case RXRPC_CONN_ABORTED:
 481                 rxrpc_set_call_completion(call, conn->completion,
 482                                           conn->abort_code, conn->error);
 483                 break;
 484         default:
 485                 BUG();
 486         }
 487
 488         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 489
 490         /* Set the channel for this call.  We don't get channel_lock as we're
 491          * only defending against the data_ready handler (which we're called
 492          * from) and the RESPONSE packet parser (which is only really
 493          * interested in call_counter and can cope with a disagreement with the
 494          * call pointer).
 495          */
 496         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 497         conn->channels[chan].call_counter = call->call_id;
 498         conn->channels[chan].call_id = call->call_id;
 499         conn->channels[chan].call = call;
 500         spin_unlock(&conn->state_lock);
 501
 502         spin_lock(&conn->peer->lock);
 503         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 504         spin_unlock(&conn->peer->lock);
 505
 506         rxrpc_start_call_timer(call);
 507         _leave("");
 508 }
 509
 510 /*
 511  * Note the re-emergence of a call.
 512  */
 513 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 514 {
 515         if (call) {
 516                 int r = refcount_read(&call->ref);
 517
 518                 trace_rxrpc_call(call->debug_id, r, 0, why);
 519         }
 520 }
 521
 522 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 523                                       enum rxrpc_call_trace why)
 524 {
 525         int r;
 526
 527         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 528                 return NULL;
 529         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 530         return call;
 531 }
 532
 533 /*
 534  * Note the addition of a ref on a call.
 535  */
 536 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 537 {
 538         int r;
 539
 540         __refcount_inc(&call->ref, &r);
 541         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 542 }
 543
 544 /*
 545  * Clean up the Rx skb ring.
 546  */
 547 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 548 {
 549         rxrpc_purge_queue(&call->recvmsg_queue);
 550         rxrpc_purge_queue(&call->rx_oos_queue);
 551 }
 552
 553 /*
 554  * Detach a call from its owning socket.
 555  */
 556 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 557 {
 558         struct rxrpc_connection *conn = call->conn;
 559         bool put = false, putu = false;
 560
 561         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 562
 563         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 564                          call->flags, rxrpc_call_see_release);
 565
 566         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 567                 BUG();
 568
 569         rxrpc_put_call_slot(call);
 570
 571         /* Make sure we don't get any more notifications */
 572         spin_lock(&rx->recvmsg_lock);
 573
 574         if (!list_empty(&call->recvmsg_link)) {
 575                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 576                        call, call->events, call->flags);
 577                 list_del(&call->recvmsg_link);
 578                 put = true;
 579         }
 580
 581         /* list_empty() must return false in rxrpc_notify_socket() */
 582         call->recvmsg_link.next = NULL;
 583         call->recvmsg_link.prev = NULL;
 584
 585         spin_unlock(&rx->recvmsg_lock);
 586         if (put)
 587                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 588
 589         write_lock(&rx->call_lock);
 590
 591         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 592                 rb_erase(&call->sock_node, &rx->calls);
 593                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 594                 putu = true;
 595         }
 596
 597         list_del(&call->sock_link);
 598         write_unlock(&rx->call_lock);
 599
 600         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 601
 602         if (putu)
 603                 rxrpc_put_call(call, rxrpc_call_put_userid);
 604
 605         _leave("");
 606 }
 607
 608 /*
 609  * release all the calls associated with a socket
 610  */
 611 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 612 {
 613         struct rxrpc_call *call;
 614
 615         _enter("%p", rx);
 616
 617         while (!list_empty(&rx->to_be_accepted)) {
 618                 call = list_entry(rx->to_be_accepted.next,
 619                                   struct rxrpc_call, accept_link);
 620                 list_del(&call->accept_link);
 621                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 622                                     rxrpc_abort_call_sock_release_tba);
 623                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 624         }
 625
 626         while (!list_empty(&rx->sock_calls)) {
 627                 call = list_entry(rx->sock_calls.next,
 628                                   struct rxrpc_call, sock_link);
 629                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 630                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 631                                     rxrpc_abort_call_sock_release);
 632                 rxrpc_release_call(rx, call);
 633                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 634         }
 635
 636         _leave("");
 637 }
 638
 639 /*
 640  * release a call
 641  */
 642 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 643 {
 644         struct rxrpc_net *rxnet = call->rxnet;
 645         unsigned int debug_id = call->debug_id;
 646         bool dead;
 647         int r;
 648
 649         ASSERT(call != NULL);
 650
 651         dead = __refcount_dec_and_test(&call->ref, &r);
 652         trace_rxrpc_call(debug_id, r - 1, 0, why);
 653         if (dead) {
 654                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 655
 656                 if (!list_empty(&call->link)) {
 657                         spin_lock(&rxnet->call_lock);
 658                         list_del_init(&call->link);
 659                         spin_unlock(&rxnet->call_lock);
 660                 }
 661
 662                 rxrpc_cleanup_call(call);
 663         }
 664 }
 665
 666 /*
 667  * Free up the call under RCU.
 668  */
 669 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 670 {
 671         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 672         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 673
 674         kmem_cache_free(rxrpc_call_jar, call);
 675         if (atomic_dec_and_test(&rxnet->nr_calls))
 676                 wake_up_var(&rxnet->nr_calls);
 677 }
 678
 679 /*
 680  * Final call destruction - but must be done in process context.
 681  */
 682 static void rxrpc_destroy_call(struct work_struct *work)
 683 {
 684         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 685         struct rxrpc_txbuf *txb;
 686
 687         del_timer_sync(&call->timer);
 688
 689         rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
 690         rxrpc_cleanup_ring(call);
 691         while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
 692                                                struct rxrpc_txbuf, call_link))) {
 693                 list_del(&txb->call_link);
 694                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 695         }
 696         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 697                                                struct rxrpc_txbuf, call_link))) {
 698                 list_del(&txb->call_link);
 699                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 700         }
 701
 702         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 703         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 704         rxrpc_deactivate_bundle(call->bundle);
 705         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 706         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 707         rxrpc_put_local(call->local, rxrpc_local_put_call);
 708         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 709 }
 710
 711 /*
 712  * clean up a call
 713  */
 714 void rxrpc_cleanup_call(struct rxrpc_call *call)
 715 {
 716         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 717
 718         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 719         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 720
 721         del_timer(&call->timer);
 722
 723         if (rcu_read_lock_held())
 724                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 725                  * something that may be running/waiting there.
 726                  */
 727                 schedule_work(&call->destroyer);
 728         else
 729                 rxrpc_destroy_call(&call->destroyer);
 730 }
 731
 732 /*
 733  * Make sure that all calls are gone from a network namespace.  To reach this
 734  * point, any open UDP sockets in that namespace must have been closed, so any
 735  * outstanding calls cannot be doing I/O.
 736  */
 737 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 738 {
 739         struct rxrpc_call *call;
 740
 741         _enter("");
 742
 743         if (!list_empty(&rxnet->calls)) {
 744                 spin_lock(&rxnet->call_lock);
 745
 746                 while (!list_empty(&rxnet->calls)) {
 747                         call = list_entry(rxnet->calls.next,
 748                                           struct rxrpc_call, link);
 749                         _debug("Zapping call %p", call);
 750
 751                         rxrpc_see_call(call, rxrpc_call_see_zap);
 752                         list_del_init(&call->link);
 753
 754                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 755                                call, refcount_read(&call->ref),
 756                                rxrpc_call_states[__rxrpc_call_state(call)],
 757                                call->flags, call->events);
 758
 759                         spin_unlock(&rxnet->call_lock);
 760                         cond_resched();
 761                         spin_lock(&rxnet->call_lock);
 762                 }
 763
 764                 spin_unlock(&rxnet->call_lock);
 765         }
 766
 767         atomic_dec(&rxnet->nr_calls);
 768         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 769 }