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