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