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 struct semaphore rxrpc_call_limiter =
  44         __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000);
  45 static struct semaphore rxrpc_kernel_call_limiter =
  46         __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000);
  47
  48 static void rxrpc_call_timer_expired(struct timer_list *t)
  49 {
  50         struct rxrpc_call *call = from_timer(call, t, timer);
  51
  52         _enter("%d", call->debug_id);
  53
  54         if (call->state < RXRPC_CALL_COMPLETE) {
  55                 trace_rxrpc_timer_expired(call, jiffies);
  56                 __rxrpc_queue_call(call);
  57         } else {
  58                 rxrpc_put_call(call, rxrpc_call_put);
  59         }
  60 }
  61
  62 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
  63                              unsigned long expire_at,
  64                              unsigned long now,
  65                              enum rxrpc_timer_trace why)
  66 {
  67         if (rxrpc_try_get_call(call, rxrpc_call_got_timer)) {
  68                 trace_rxrpc_timer(call, why, now);
  69                 if (timer_reduce(&call->timer, expire_at))
  70                         rxrpc_put_call(call, rxrpc_call_put_notimer);
  71         }
  72 }
  73
  74 void rxrpc_delete_call_timer(struct rxrpc_call *call)
  75 {
  76         if (del_timer_sync(&call->timer))
  77                 rxrpc_put_call(call, rxrpc_call_put_timer);
  78 }
  79
  80 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  81
  82 /*
  83  * find an extant server call
  84  * - called in process context with IRQs enabled
  85  */
  86 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  87                                               unsigned long user_call_ID)
  88 {
  89         struct rxrpc_call *call;
  90         struct rb_node *p;
  91
  92         _enter("%p,%lx", rx, user_call_ID);
  93
  94         read_lock(&rx->call_lock);
  95
  96         p = rx->calls.rb_node;
  97         while (p) {
  98                 call = rb_entry(p, struct rxrpc_call, sock_node);
  99
 100                 if (user_call_ID < call->user_call_ID)
 101                         p = p->rb_left;
 102                 else if (user_call_ID > call->user_call_ID)
 103                         p = p->rb_right;
 104                 else
 105                         goto found_extant_call;
 106         }
 107
 108         read_unlock(&rx->call_lock);
 109         _leave(" = NULL");
 110         return NULL;
 111
 112 found_extant_call:
 113         rxrpc_get_call(call, rxrpc_call_got);
 114         read_unlock(&rx->call_lock);
 115         _leave(" = %p [%d]", call, refcount_read(&call->ref));
 116         return call;
 117 }
 118
 119 /*
 120  * allocate a new call
 121  */
 122 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 123                                     unsigned int debug_id)
 124 {
 125         struct rxrpc_call *call;
 126         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 127
 128         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 129         if (!call)
 130                 return NULL;
 131
 132         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 133                                     sizeof(struct sk_buff *),
 134                                     gfp);
 135         if (!call->rxtx_buffer)
 136                 goto nomem;
 137
 138         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 139         if (!call->rxtx_annotations)
 140                 goto nomem_2;
 141
 142         mutex_init(&call->user_mutex);
 143
 144         /* Prevent lockdep reporting a deadlock false positive between the afs
 145          * filesystem and sys_sendmsg() via the mmap sem.
 146          */
 147         if (rx->sk.sk_kern_sock)
 148                 lockdep_set_class(&call->user_mutex,
 149                                   &rxrpc_call_user_mutex_lock_class_key);
 150
 151         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 152         INIT_WORK(&call->processor, &rxrpc_process_call);
 153         INIT_LIST_HEAD(&call->link);
 154         INIT_LIST_HEAD(&call->chan_wait_link);
 155         INIT_LIST_HEAD(&call->accept_link);
 156         INIT_LIST_HEAD(&call->recvmsg_link);
 157         INIT_LIST_HEAD(&call->sock_link);
 158         INIT_LIST_HEAD(&call->tx_buffer);
 159         skb_queue_head_init(&call->recvmsg_queue);
 160         skb_queue_head_init(&call->rx_oos_queue);
 161         init_waitqueue_head(&call->waitq);
 162         spin_lock_init(&call->notify_lock);
 163         spin_lock_init(&call->tx_lock);
 164         spin_lock_init(&call->input_lock);
 165         spin_lock_init(&call->acks_ack_lock);
 166         rwlock_init(&call->state_lock);
 167         refcount_set(&call->ref, 1);
 168         call->debug_id = debug_id;
 169         call->tx_total_len = -1;
 170         call->next_rx_timo = 20 * HZ;
 171         call->next_req_timo = 1 * HZ;
 172         atomic64_set(&call->ackr_window, 0x100000001ULL);
 173
 174         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 175
 176         call->rx_winsize = rxrpc_rx_window_size;
 177         call->tx_winsize = 16;
 178
 179         call->cong_cwnd = 2;
 180         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 181
 182         call->rxnet = rxnet;
 183         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 184         atomic_inc(&rxnet->nr_calls);
 185         return call;
 186
 187 nomem_2:
 188         kfree(call->rxtx_buffer);
 189 nomem:
 190         kmem_cache_free(rxrpc_call_jar, call);
 191         return NULL;
 192 }
 193
 194 /*
 195  * Allocate a new client call.
 196  */
 197 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 198                                                   struct sockaddr_rxrpc *srx,
 199                                                   gfp_t gfp,
 200                                                   unsigned int debug_id)
 201 {
 202         struct rxrpc_call *call;
 203         ktime_t now;
 204
 205         _enter("");
 206
 207         call = rxrpc_alloc_call(rx, gfp, debug_id);
 208         if (!call)
 209                 return ERR_PTR(-ENOMEM);
 210         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 211         call->service_id = srx->srx_service;
 212         now = ktime_get_real();
 213         call->acks_latest_ts = now;
 214         call->cong_tstamp = now;
 215
 216         _leave(" = %p", call);
 217         return call;
 218 }
 219
 220 /*
 221  * Initiate the call ack/resend/expiry timer.
 222  */
 223 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 224 {
 225         unsigned long now = jiffies;
 226         unsigned long j = now + MAX_JIFFY_OFFSET;
 227
 228         call->delay_ack_at = j;
 229         call->ack_lost_at = j;
 230         call->resend_at = j;
 231         call->ping_at = j;
 232         call->expect_rx_by = j;
 233         call->expect_req_by = j;
 234         call->expect_term_by = j;
 235         call->timer.expires = now;
 236 }
 237
 238 /*
 239  * Wait for a call slot to become available.
 240  */
 241 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 242 {
 243         struct semaphore *limiter = &rxrpc_call_limiter;
 244
 245         if (p->kernel)
 246                 limiter = &rxrpc_kernel_call_limiter;
 247         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 248                 down(limiter);
 249                 return limiter;
 250         }
 251         return down_interruptible(limiter) < 0 ? NULL : limiter;
 252 }
 253
 254 /*
 255  * Release a call slot.
 256  */
 257 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 258 {
 259         struct semaphore *limiter = &rxrpc_call_limiter;
 260
 261         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 262                 limiter = &rxrpc_kernel_call_limiter;
 263         up(limiter);
 264 }
 265
 266 /*
 267  * Set up a call for the given parameters.
 268  * - Called with the socket lock held, which it must release.
 269  * - If it returns a call, the call's lock will need releasing by the caller.
 270  */
 271 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 272                                          struct rxrpc_conn_parameters *cp,
 273                                          struct sockaddr_rxrpc *srx,
 274                                          struct rxrpc_call_params *p,
 275                                          gfp_t gfp,
 276                                          unsigned int debug_id)
 277         __releases(&rx->sk.sk_lock.slock)
 278         __acquires(&call->user_mutex)
 279 {
 280         struct rxrpc_call *call, *xcall;
 281         struct rxrpc_net *rxnet;
 282         struct semaphore *limiter;
 283         struct rb_node *parent, **pp;
 284         const void *here = __builtin_return_address(0);
 285         int ret;
 286
 287         _enter("%p,%lx", rx, p->user_call_ID);
 288
 289         limiter = rxrpc_get_call_slot(p, gfp);
 290         if (!limiter) {
 291                 release_sock(&rx->sk);
 292                 return ERR_PTR(-ERESTARTSYS);
 293         }
 294
 295         call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
 296         if (IS_ERR(call)) {
 297                 release_sock(&rx->sk);
 298                 up(limiter);
 299                 _leave(" = %ld", PTR_ERR(call));
 300                 return call;
 301         }
 302
 303         call->interruptibility = p->interruptibility;
 304         call->tx_total_len = p->tx_total_len;
 305         trace_rxrpc_call(call->debug_id, rxrpc_call_new_client,
 306                          refcount_read(&call->ref),
 307                          here, (const void *)p->user_call_ID);
 308         if (p->kernel)
 309                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 310
 311         /* We need to protect a partially set up call against the user as we
 312          * will be acting outside the socket lock.
 313          */
 314         mutex_lock(&call->user_mutex);
 315
 316         /* Publish the call, even though it is incompletely set up as yet */
 317         write_lock(&rx->call_lock);
 318
 319         pp = &rx->calls.rb_node;
 320         parent = NULL;
 321         while (*pp) {
 322                 parent = *pp;
 323                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 324
 325                 if (p->user_call_ID < xcall->user_call_ID)
 326                         pp = &(*pp)->rb_left;
 327                 else if (p->user_call_ID > xcall->user_call_ID)
 328                         pp = &(*pp)->rb_right;
 329                 else
 330                         goto error_dup_user_ID;
 331         }
 332
 333         rcu_assign_pointer(call->socket, rx);
 334         call->user_call_ID = p->user_call_ID;
 335         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 336         rxrpc_get_call(call, rxrpc_call_got_userid);
 337         rb_link_node(&call->sock_node, parent, pp);
 338         rb_insert_color(&call->sock_node, &rx->calls);
 339         list_add(&call->sock_link, &rx->sock_calls);
 340
 341         write_unlock(&rx->call_lock);
 342
 343         rxnet = call->rxnet;
 344         spin_lock_bh(&rxnet->call_lock);
 345         list_add_tail_rcu(&call->link, &rxnet->calls);
 346         spin_unlock_bh(&rxnet->call_lock);
 347
 348         /* From this point on, the call is protected by its own lock. */
 349         release_sock(&rx->sk);
 350
 351         /* Set up or get a connection record and set the protocol parameters,
 352          * including channel number and call ID.
 353          */
 354         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
 355         if (ret < 0)
 356                 goto error_attached_to_socket;
 357
 358         trace_rxrpc_call(call->debug_id, rxrpc_call_connected,
 359                          refcount_read(&call->ref), here, NULL);
 360
 361         rxrpc_start_call_timer(call);
 362
 363         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 364
 365         _leave(" = %p [new]", call);
 366         return call;
 367
 368         /* We unexpectedly found the user ID in the list after taking
 369          * the call_lock.  This shouldn't happen unless the user races
 370          * with itself and tries to add the same user ID twice at the
 371          * same time in different threads.
 372          */
 373 error_dup_user_ID:
 374         write_unlock(&rx->call_lock);
 375         release_sock(&rx->sk);
 376         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 377                                     RX_CALL_DEAD, -EEXIST);
 378         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 379                          refcount_read(&call->ref), here, ERR_PTR(-EEXIST));
 380         rxrpc_release_call(rx, call);
 381         mutex_unlock(&call->user_mutex);
 382         rxrpc_put_call(call, rxrpc_call_put);
 383         _leave(" = -EEXIST");
 384         return ERR_PTR(-EEXIST);
 385
 386         /* We got an error, but the call is attached to the socket and is in
 387          * need of release.  However, we might now race with recvmsg() when
 388          * completing the call queues it.  Return 0 from sys_sendmsg() and
 389          * leave the error to recvmsg() to deal with.
 390          */
 391 error_attached_to_socket:
 392         trace_rxrpc_call(call->debug_id, rxrpc_call_error,
 393                          refcount_read(&call->ref), here, ERR_PTR(ret));
 394         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 395         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 396                                     RX_CALL_DEAD, ret);
 397         _leave(" = c=%08x [err]", call->debug_id);
 398         return call;
 399 }
 400
 401 /*
 402  * Set up an incoming call.  call->conn points to the connection.
 403  * This is called in BH context and isn't allowed to fail.
 404  */
 405 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 406                          struct rxrpc_call *call,
 407                          struct sk_buff *skb)
 408 {
 409         struct rxrpc_connection *conn = call->conn;
 410         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 411         u32 chan;
 412
 413         _enter(",%d", call->conn->debug_id);
 414
 415         rcu_assign_pointer(call->socket, rx);
 416         call->call_id           = sp->hdr.callNumber;
 417         call->service_id        = sp->hdr.serviceId;
 418         call->cid               = sp->hdr.cid;
 419         call->state             = RXRPC_CALL_SERVER_SECURING;
 420         call->cong_tstamp       = skb->tstamp;
 421
 422         /* Set the channel for this call.  We don't get channel_lock as we're
 423          * only defending against the data_ready handler (which we're called
 424          * from) and the RESPONSE packet parser (which is only really
 425          * interested in call_counter and can cope with a disagreement with the
 426          * call pointer).
 427          */
 428         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 429         conn->channels[chan].call_counter = call->call_id;
 430         conn->channels[chan].call_id = call->call_id;
 431         rcu_assign_pointer(conn->channels[chan].call, call);
 432
 433         spin_lock(&conn->params.peer->lock);
 434         hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
 435         spin_unlock(&conn->params.peer->lock);
 436
 437         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 438
 439         rxrpc_start_call_timer(call);
 440         _leave("");
 441 }
 442
 443 /*
 444  * Queue a call's work processor, getting a ref to pass to the work queue.
 445  */
 446 bool rxrpc_queue_call(struct rxrpc_call *call)
 447 {
 448         const void *here = __builtin_return_address(0);
 449         int n;
 450
 451         if (!__refcount_inc_not_zero(&call->ref, &n))
 452                 return false;
 453         if (rxrpc_queue_work(&call->processor))
 454                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
 455                                  here, NULL);
 456         else
 457                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 458         return true;
 459 }
 460
 461 /*
 462  * Queue a call's work processor, passing the callers ref to the work queue.
 463  */
 464 bool __rxrpc_queue_call(struct rxrpc_call *call)
 465 {
 466         const void *here = __builtin_return_address(0);
 467         int n = refcount_read(&call->ref);
 468         ASSERTCMP(n, >=, 1);
 469         if (rxrpc_queue_work(&call->processor))
 470                 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
 471                                  here, NULL);
 472         else
 473                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 474         return true;
 475 }
 476
 477 /*
 478  * Note the re-emergence of a call.
 479  */
 480 void rxrpc_see_call(struct rxrpc_call *call)
 481 {
 482         const void *here = __builtin_return_address(0);
 483         if (call) {
 484                 int n = refcount_read(&call->ref);
 485
 486                 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
 487                                  here, NULL);
 488         }
 489 }
 490
 491 bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 492 {
 493         const void *here = __builtin_return_address(0);
 494         int n;
 495
 496         if (!__refcount_inc_not_zero(&call->ref, &n))
 497                 return false;
 498         trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL);
 499         return true;
 500 }
 501
 502 /*
 503  * Note the addition of a ref on a call.
 504  */
 505 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 506 {
 507         const void *here = __builtin_return_address(0);
 508         int n;
 509
 510         __refcount_inc(&call->ref, &n);
 511         trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL);
 512 }
 513
 514 /*
 515  * Clean up the Rx skb ring.
 516  */
 517 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 518 {
 519         int i;
 520
 521         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 522                 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
 523                 call->rxtx_buffer[i] = NULL;
 524         }
 525         skb_queue_purge(&call->recvmsg_queue);
 526         skb_queue_purge(&call->rx_oos_queue);
 527 }
 528
 529 /*
 530  * Detach a call from its owning socket.
 531  */
 532 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 533 {
 534         const void *here = __builtin_return_address(0);
 535         struct rxrpc_connection *conn = call->conn;
 536         bool put = false;
 537
 538         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 539
 540         trace_rxrpc_call(call->debug_id, rxrpc_call_release,
 541                          refcount_read(&call->ref),
 542                          here, (const void *)call->flags);
 543
 544         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 545
 546         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 547                 BUG();
 548
 549         rxrpc_put_call_slot(call);
 550         rxrpc_delete_call_timer(call);
 551
 552         /* Make sure we don't get any more notifications */
 553         write_lock_bh(&rx->recvmsg_lock);
 554
 555         if (!list_empty(&call->recvmsg_link)) {
 556                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 557                        call, call->events, call->flags);
 558                 list_del(&call->recvmsg_link);
 559                 put = true;
 560         }
 561
 562         /* list_empty() must return false in rxrpc_notify_socket() */
 563         call->recvmsg_link.next = NULL;
 564         call->recvmsg_link.prev = NULL;
 565
 566         write_unlock_bh(&rx->recvmsg_lock);
 567         if (put)
 568                 rxrpc_put_call(call, rxrpc_call_put);
 569
 570         write_lock(&rx->call_lock);
 571
 572         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 573                 rb_erase(&call->sock_node, &rx->calls);
 574                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 575                 rxrpc_put_call(call, rxrpc_call_put_userid);
 576         }
 577
 578         list_del(&call->sock_link);
 579         write_unlock(&rx->call_lock);
 580
 581         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 582
 583         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
 584                 rxrpc_disconnect_call(call);
 585         if (call->security)
 586                 call->security->free_call_crypto(call);
 587         _leave("");
 588 }
 589
 590 /*
 591  * release all the calls associated with a socket
 592  */
 593 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 594 {
 595         struct rxrpc_call *call;
 596
 597         _enter("%p", rx);
 598
 599         while (!list_empty(&rx->to_be_accepted)) {
 600                 call = list_entry(rx->to_be_accepted.next,
 601                                   struct rxrpc_call, accept_link);
 602                 list_del(&call->accept_link);
 603                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
 604                 rxrpc_put_call(call, rxrpc_call_put);
 605         }
 606
 607         while (!list_empty(&rx->sock_calls)) {
 608                 call = list_entry(rx->sock_calls.next,
 609                                   struct rxrpc_call, sock_link);
 610                 rxrpc_get_call(call, rxrpc_call_got);
 611                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
 612                 rxrpc_send_abort_packet(call);
 613                 rxrpc_release_call(rx, call);
 614                 rxrpc_put_call(call, rxrpc_call_put);
 615         }
 616
 617         _leave("");
 618 }
 619
 620 /*
 621  * release a call
 622  */
 623 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 624 {
 625         struct rxrpc_net *rxnet = call->rxnet;
 626         const void *here = __builtin_return_address(0);
 627         unsigned int debug_id = call->debug_id;
 628         bool dead;
 629         int n;
 630
 631         ASSERT(call != NULL);
 632
 633         dead = __refcount_dec_and_test(&call->ref, &n);
 634         trace_rxrpc_call(debug_id, op, n, here, NULL);
 635         if (dead) {
 636                 _debug("call %d dead", call->debug_id);
 637                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 638
 639                 if (!list_empty(&call->link)) {
 640                         spin_lock_bh(&rxnet->call_lock);
 641                         list_del_init(&call->link);
 642                         spin_unlock_bh(&rxnet->call_lock);
 643                 }
 644
 645                 rxrpc_cleanup_call(call);
 646         }
 647 }
 648
 649 /*
 650  * Final call destruction - but must be done in process context.
 651  */
 652 static void rxrpc_destroy_call(struct work_struct *work)
 653 {
 654         struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
 655         struct rxrpc_net *rxnet = call->rxnet;
 656
 657         rxrpc_delete_call_timer(call);
 658
 659         rxrpc_put_connection(call->conn);
 660         rxrpc_put_peer(call->peer);
 661         kfree(call->rxtx_buffer);
 662         kfree(call->rxtx_annotations);
 663         kmem_cache_free(rxrpc_call_jar, call);
 664         if (atomic_dec_and_test(&rxnet->nr_calls))
 665                 wake_up_var(&rxnet->nr_calls);
 666 }
 667
 668 /*
 669  * Final call destruction under RCU.
 670  */
 671 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 672 {
 673         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 674
 675         if (in_softirq()) {
 676                 INIT_WORK(&call->processor, rxrpc_destroy_call);
 677                 if (!rxrpc_queue_work(&call->processor))
 678                         BUG();
 679         } else {
 680                 rxrpc_destroy_call(&call->processor);
 681         }
 682 }
 683
 684 /*
 685  * clean up a call
 686  */
 687 void rxrpc_cleanup_call(struct rxrpc_call *call)
 688 {
 689         struct rxrpc_txbuf *txb;
 690
 691         _net("DESTROY CALL %d", call->debug_id);
 692
 693         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 694
 695         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 696         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 697
 698         rxrpc_cleanup_ring(call);
 699         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 700                                                struct rxrpc_txbuf, call_link))) {
 701                 list_del(&txb->call_link);
 702                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 703         }
 704         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 705         rxrpc_free_skb(call->acks_soft_tbl, rxrpc_skb_cleaned);
 706
 707         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 708 }
 709
 710 /*
 711  * Make sure that all calls are gone from a network namespace.  To reach this
 712  * point, any open UDP sockets in that namespace must have been closed, so any
 713  * outstanding calls cannot be doing I/O.
 714  */
 715 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 716 {
 717         struct rxrpc_call *call;
 718
 719         _enter("");
 720
 721         if (!list_empty(&rxnet->calls)) {
 722                 spin_lock_bh(&rxnet->call_lock);
 723
 724                 while (!list_empty(&rxnet->calls)) {
 725                         call = list_entry(rxnet->calls.next,
 726                                           struct rxrpc_call, link);
 727                         _debug("Zapping call %p", call);
 728
 729                         rxrpc_see_call(call);
 730                         list_del_init(&call->link);
 731
 732                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 733                                call, refcount_read(&call->ref),
 734                                rxrpc_call_states[call->state],
 735                                call->flags, call->events);
 736
 737                         spin_unlock_bh(&rxnet->call_lock);
 738                         cond_resched();
 739                         spin_lock_bh(&rxnet->call_lock);
 740                 }
 741
 742                 spin_unlock_bh(&rxnet->call_lock);
 743         }
 744
 745         atomic_dec(&rxnet->nr_calls);
 746         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 747 }