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