net/rxrpc/call_object.c

   1 /* RxRPC individual remote procedure call handling
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/circ_buf.h>
  17 #include <linux/spinlock_types.h>
  18 #include <net/sock.h>
  19 #include <net/af_rxrpc.h>
  20 #include "ar-internal.h"
  21
  22 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
  23         [RXRPC_CALL_UNINITIALISED]              = "Uninit  ",
  24         [RXRPC_CALL_CLIENT_AWAIT_CONN]          = "ClWtConn",
  25         [RXRPC_CALL_CLIENT_SEND_REQUEST]        = "ClSndReq",
  26         [RXRPC_CALL_CLIENT_AWAIT_REPLY]         = "ClAwtRpl",
  27         [RXRPC_CALL_CLIENT_RECV_REPLY]          = "ClRcvRpl",
  28         [RXRPC_CALL_SERVER_PREALLOC]            = "SvPrealc",
  29         [RXRPC_CALL_SERVER_SECURING]            = "SvSecure",
  30         [RXRPC_CALL_SERVER_ACCEPTING]           = "SvAccept",
  31         [RXRPC_CALL_SERVER_RECV_REQUEST]        = "SvRcvReq",
  32         [RXRPC_CALL_SERVER_ACK_REQUEST]         = "SvAckReq",
  33         [RXRPC_CALL_SERVER_SEND_REPLY]          = "SvSndRpl",
  34         [RXRPC_CALL_SERVER_AWAIT_ACK]           = "SvAwtACK",
  35         [RXRPC_CALL_COMPLETE]                   = "Complete",
  36 };
  37
  38 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
  39         [RXRPC_CALL_SUCCEEDED]                  = "Complete",
  40         [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
  41         [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
  42         [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
  43         [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
  44 };
  45
  46 struct kmem_cache *rxrpc_call_jar;
  47
  48 static void rxrpc_call_timer_expired(unsigned long _call)
  49 {
  50         struct rxrpc_call *call = (struct rxrpc_call *)_call;
  51
  52         _enter("%d", call->debug_id);
  53
  54         if (call->state < RXRPC_CALL_COMPLETE)
  55                 rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
  56 }
  57
  58 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  59
  60 /*
  61  * find an extant server call
  62  * - called in process context with IRQs enabled
  63  */
  64 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  65                                               unsigned long user_call_ID)
  66 {
  67         struct rxrpc_call *call;
  68         struct rb_node *p;
  69
  70         _enter("%p,%lx", rx, user_call_ID);
  71
  72         read_lock(&rx->call_lock);
  73
  74         p = rx->calls.rb_node;
  75         while (p) {
  76                 call = rb_entry(p, struct rxrpc_call, sock_node);
  77
  78                 if (user_call_ID < call->user_call_ID)
  79                         p = p->rb_left;
  80                 else if (user_call_ID > call->user_call_ID)
  81                         p = p->rb_right;
  82                 else
  83                         goto found_extant_call;
  84         }
  85
  86         read_unlock(&rx->call_lock);
  87         _leave(" = NULL");
  88         return NULL;
  89
  90 found_extant_call:
  91         rxrpc_get_call(call, rxrpc_call_got);
  92         read_unlock(&rx->call_lock);
  93         _leave(" = %p [%d]", call, atomic_read(&call->usage));
  94         return call;
  95 }
  96
  97 /*
  98  * allocate a new call
  99  */
 100 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp)
 101 {
 102         struct rxrpc_call *call;
 103
 104         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 105         if (!call)
 106                 return NULL;
 107
 108         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 109                                     sizeof(struct sk_buff *),
 110                                     gfp);
 111         if (!call->rxtx_buffer)
 112                 goto nomem;
 113
 114         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 115         if (!call->rxtx_annotations)
 116                 goto nomem_2;
 117
 118         mutex_init(&call->user_mutex);
 119
 120         /* Prevent lockdep reporting a deadlock false positive between the afs
 121          * filesystem and sys_sendmsg() via the mmap sem.
 122          */
 123         if (rx->sk.sk_kern_sock)
 124                 lockdep_set_class(&call->user_mutex,
 125                                   &rxrpc_call_user_mutex_lock_class_key);
 126
 127         setup_timer(&call->timer, rxrpc_call_timer_expired,
 128                     (unsigned long)call);
 129         INIT_WORK(&call->processor, &rxrpc_process_call);
 130         INIT_LIST_HEAD(&call->link);
 131         INIT_LIST_HEAD(&call->chan_wait_link);
 132         INIT_LIST_HEAD(&call->accept_link);
 133         INIT_LIST_HEAD(&call->recvmsg_link);
 134         INIT_LIST_HEAD(&call->sock_link);
 135         init_waitqueue_head(&call->waitq);
 136         spin_lock_init(&call->lock);
 137         rwlock_init(&call->state_lock);
 138         atomic_set(&call->usage, 1);
 139         call->debug_id = atomic_inc_return(&rxrpc_debug_id);
 140         call->tx_total_len = -1;
 141
 142         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 143
 144         /* Leave space in the ring to handle a maxed-out jumbo packet */
 145         call->rx_winsize = rxrpc_rx_window_size;
 146         call->tx_winsize = 16;
 147         call->rx_expect_next = 1;
 148
 149         call->cong_cwnd = 2;
 150         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
 151         return call;
 152
 153 nomem_2:
 154         kfree(call->rxtx_buffer);
 155 nomem:
 156         kmem_cache_free(rxrpc_call_jar, call);
 157         return NULL;
 158 }
 159
 160 /*
 161  * Allocate a new client call.
 162  */
 163 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 164                                                   struct sockaddr_rxrpc *srx,
 165                                                   gfp_t gfp)
 166 {
 167         struct rxrpc_call *call;
 168         ktime_t now;
 169
 170         _enter("");
 171
 172         call = rxrpc_alloc_call(rx, gfp);
 173         if (!call)
 174                 return ERR_PTR(-ENOMEM);
 175         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 176         call->service_id = srx->srx_service;
 177         call->tx_phase = true;
 178         now = ktime_get_real();
 179         call->acks_latest_ts = now;
 180         call->cong_tstamp = now;
 181
 182         _leave(" = %p", call);
 183         return call;
 184 }
 185
 186 /*
 187  * Initiate the call ack/resend/expiry timer.
 188  */
 189 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 190 {
 191         ktime_t now = ktime_get_real(), expire_at;
 192
 193         expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
 194         call->expire_at = expire_at;
 195         call->ack_at = expire_at;
 196         call->ping_at = expire_at;
 197         call->resend_at = expire_at;
 198         call->timer.expires = jiffies + LONG_MAX / 2;
 199         rxrpc_set_timer(call, rxrpc_timer_begin, now);
 200 }
 201
 202 /*
 203  * Set up a call for the given parameters.
 204  * - Called with the socket lock held, which it must release.
 205  * - If it returns a call, the call's lock will need releasing by the caller.
 206  */
 207 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 208                                          struct rxrpc_conn_parameters *cp,
 209                                          struct sockaddr_rxrpc *srx,
 210                                          unsigned long user_call_ID,
 211                                          s64 tx_total_len,
 212                                          gfp_t gfp)
 213         __releases(&rx->sk.sk_lock.slock)
 214 {
 215         struct rxrpc_call *call, *xcall;
 216         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 217         struct rb_node *parent, **pp;
 218         const void *here = __builtin_return_address(0);
 219         int ret;
 220
 221         _enter("%p,%lx", rx, user_call_ID);
 222
 223         call = rxrpc_alloc_client_call(rx, srx, gfp);
 224         if (IS_ERR(call)) {
 225                 release_sock(&rx->sk);
 226                 _leave(" = %ld", PTR_ERR(call));
 227                 return call;
 228         }
 229
 230         call->tx_total_len = tx_total_len;
 231         trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
 232                          here, (const void *)user_call_ID);
 233
 234         /* We need to protect a partially set up call against the user as we
 235          * will be acting outside the socket lock.
 236          */
 237         mutex_lock(&call->user_mutex);
 238
 239         /* Publish the call, even though it is incompletely set up as yet */
 240         write_lock(&rx->call_lock);
 241
 242         pp = &rx->calls.rb_node;
 243         parent = NULL;
 244         while (*pp) {
 245                 parent = *pp;
 246                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 247
 248                 if (user_call_ID < xcall->user_call_ID)
 249                         pp = &(*pp)->rb_left;
 250                 else if (user_call_ID > xcall->user_call_ID)
 251                         pp = &(*pp)->rb_right;
 252                 else
 253                         goto error_dup_user_ID;
 254         }
 255
 256         rcu_assign_pointer(call->socket, rx);
 257         call->user_call_ID = user_call_ID;
 258         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 259         rxrpc_get_call(call, rxrpc_call_got_userid);
 260         rb_link_node(&call->sock_node, parent, pp);
 261         rb_insert_color(&call->sock_node, &rx->calls);
 262         list_add(&call->sock_link, &rx->sock_calls);
 263
 264         write_unlock(&rx->call_lock);
 265
 266         write_lock(&rxnet->call_lock);
 267         list_add_tail(&call->link, &rxnet->calls);
 268         write_unlock(&rxnet->call_lock);
 269
 270         /* From this point on, the call is protected by its own lock. */
 271         release_sock(&rx->sk);
 272
 273         /* Set up or get a connection record and set the protocol parameters,
 274          * including channel number and call ID.
 275          */
 276         ret = rxrpc_connect_call(call, cp, srx, gfp);
 277         if (ret < 0)
 278                 goto error_attached_to_socket;
 279
 280         trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
 281                          here, NULL);
 282
 283         rxrpc_start_call_timer(call);
 284
 285         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 286
 287         _leave(" = %p [new]", call);
 288         return call;
 289
 290         /* We unexpectedly found the user ID in the list after taking
 291          * the call_lock.  This shouldn't happen unless the user races
 292          * with itself and tries to add the same user ID twice at the
 293          * same time in different threads.
 294          */
 295 error_dup_user_ID:
 296         write_unlock(&rx->call_lock);
 297         release_sock(&rx->sk);
 298         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 299                                     RX_CALL_DEAD, -EEXIST);
 300         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 301                          here, ERR_PTR(-EEXIST));
 302         rxrpc_release_call(rx, call);
 303         mutex_unlock(&call->user_mutex);
 304         rxrpc_put_call(call, rxrpc_call_put);
 305         _leave(" = -EEXIST");
 306         return ERR_PTR(-EEXIST);
 307
 308         /* We got an error, but the call is attached to the socket and is in
 309          * need of release.  However, we might now race with recvmsg() when
 310          * completing the call queues it.  Return 0 from sys_sendmsg() and
 311          * leave the error to recvmsg() to deal with.
 312          */
 313 error_attached_to_socket:
 314         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 315                          here, ERR_PTR(ret));
 316         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 317         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 318                                     RX_CALL_DEAD, ret);
 319         _leave(" = c=%08x [err]", call->debug_id);
 320         return call;
 321 }
 322
 323 /*
 324  * Retry a call to a new address.  It is expected that the Tx queue of the call
 325  * will contain data previously packaged for an old call.
 326  */
 327 int rxrpc_retry_client_call(struct rxrpc_sock *rx,
 328                             struct rxrpc_call *call,
 329                             struct rxrpc_conn_parameters *cp,
 330                             struct sockaddr_rxrpc *srx,
 331                             gfp_t gfp)
 332 {
 333         const void *here = __builtin_return_address(0);
 334         int ret;
 335
 336         /* Set up or get a connection record and set the protocol parameters,
 337          * including channel number and call ID.
 338          */
 339         ret = rxrpc_connect_call(call, cp, srx, gfp);
 340         if (ret < 0)
 341                 goto error;
 342
 343         trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
 344                          here, NULL);
 345
 346         rxrpc_start_call_timer(call);
 347
 348         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 349
 350         if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
 351                 rxrpc_queue_call(call);
 352
 353         _leave(" = 0");
 354         return 0;
 355
 356 error:
 357         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 358                                   RX_CALL_DEAD, ret);
 359         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 360                          here, ERR_PTR(ret));
 361         _leave(" = %d", ret);
 362         return ret;
 363 }
 364
 365 /*
 366  * Set up an incoming call.  call->conn points to the connection.
 367  * This is called in BH context and isn't allowed to fail.
 368  */
 369 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 370                          struct rxrpc_call *call,
 371                          struct sk_buff *skb)
 372 {
 373         struct rxrpc_connection *conn = call->conn;
 374         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 375         u32 chan;
 376
 377         _enter(",%d", call->conn->debug_id);
 378
 379         rcu_assign_pointer(call->socket, rx);
 380         call->call_id           = sp->hdr.callNumber;
 381         call->service_id        = sp->hdr.serviceId;
 382         call->cid               = sp->hdr.cid;
 383         call->state             = RXRPC_CALL_SERVER_ACCEPTING;
 384         if (sp->hdr.securityIndex > 0)
 385                 call->state     = RXRPC_CALL_SERVER_SECURING;
 386         call->cong_tstamp       = skb->tstamp;
 387
 388         /* Set the channel for this call.  We don't get channel_lock as we're
 389          * only defending against the data_ready handler (which we're called
 390          * from) and the RESPONSE packet parser (which is only really
 391          * interested in call_counter and can cope with a disagreement with the
 392          * call pointer).
 393          */
 394         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 395         conn->channels[chan].call_counter = call->call_id;
 396         conn->channels[chan].call_id = call->call_id;
 397         rcu_assign_pointer(conn->channels[chan].call, call);
 398
 399         spin_lock(&conn->params.peer->lock);
 400         hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
 401         spin_unlock(&conn->params.peer->lock);
 402
 403         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 404
 405         rxrpc_start_call_timer(call);
 406         _leave("");
 407 }
 408
 409 /*
 410  * Queue a call's work processor, getting a ref to pass to the work queue.
 411  */
 412 bool rxrpc_queue_call(struct rxrpc_call *call)
 413 {
 414         const void *here = __builtin_return_address(0);
 415         int n = __atomic_add_unless(&call->usage, 1, 0);
 416         if (n == 0)
 417                 return false;
 418         if (rxrpc_queue_work(&call->processor))
 419                 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
 420         else
 421                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 422         return true;
 423 }
 424
 425 /*
 426  * Queue a call's work processor, passing the callers ref to the work queue.
 427  */
 428 bool __rxrpc_queue_call(struct rxrpc_call *call)
 429 {
 430         const void *here = __builtin_return_address(0);
 431         int n = atomic_read(&call->usage);
 432         ASSERTCMP(n, >=, 1);
 433         if (rxrpc_queue_work(&call->processor))
 434                 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
 435         else
 436                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 437         return true;
 438 }
 439
 440 /*
 441  * Note the re-emergence of a call.
 442  */
 443 void rxrpc_see_call(struct rxrpc_call *call)
 444 {
 445         const void *here = __builtin_return_address(0);
 446         if (call) {
 447                 int n = atomic_read(&call->usage);
 448
 449                 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
 450         }
 451 }
 452
 453 /*
 454  * Note the addition of a ref on a call.
 455  */
 456 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 457 {
 458         const void *here = __builtin_return_address(0);
 459         int n = atomic_inc_return(&call->usage);
 460
 461         trace_rxrpc_call(call, op, n, here, NULL);
 462 }
 463
 464 /*
 465  * Detach a call from its owning socket.
 466  */
 467 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 468 {
 469         const void *here = __builtin_return_address(0);
 470         struct rxrpc_connection *conn = call->conn;
 471         bool put = false;
 472         int i;
 473
 474         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 475
 476         trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
 477                          here, (const void *)call->flags);
 478
 479         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 480
 481         spin_lock_bh(&call->lock);
 482         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 483                 BUG();
 484         spin_unlock_bh(&call->lock);
 485
 486         del_timer_sync(&call->timer);
 487
 488         /* Make sure we don't get any more notifications */
 489         write_lock_bh(&rx->recvmsg_lock);
 490
 491         if (!list_empty(&call->recvmsg_link)) {
 492                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 493                        call, call->events, call->flags);
 494                 list_del(&call->recvmsg_link);
 495                 put = true;
 496         }
 497
 498         /* list_empty() must return false in rxrpc_notify_socket() */
 499         call->recvmsg_link.next = NULL;
 500         call->recvmsg_link.prev = NULL;
 501
 502         write_unlock_bh(&rx->recvmsg_lock);
 503         if (put)
 504                 rxrpc_put_call(call, rxrpc_call_put);
 505
 506         write_lock(&rx->call_lock);
 507
 508         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 509                 rb_erase(&call->sock_node, &rx->calls);
 510                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 511                 rxrpc_put_call(call, rxrpc_call_put_userid);
 512         }
 513
 514         list_del(&call->sock_link);
 515         write_unlock(&rx->call_lock);
 516
 517         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 518
 519         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
 520                 rxrpc_disconnect_call(call);
 521
 522         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 523                 rxrpc_free_skb(call->rxtx_buffer[i],
 524                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 525                                 rxrpc_skb_rx_cleaned));
 526                 call->rxtx_buffer[i] = NULL;
 527         }
 528
 529         _leave("");
 530 }
 531
 532 /*
 533  * Prepare a kernel service call for retry.
 534  */
 535 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call)
 536 {
 537         const void *here = __builtin_return_address(0);
 538         int i;
 539         u8 last = 0;
 540
 541         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 542
 543         trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
 544                          here, (const void *)call->flags);
 545
 546         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 547         ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED);
 548         ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED);
 549         ASSERT(list_empty(&call->recvmsg_link));
 550
 551         del_timer_sync(&call->timer);
 552
 553         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn);
 554
 555         if (call->conn)
 556                 rxrpc_disconnect_call(call);
 557
 558         if (rxrpc_is_service_call(call) ||
 559             !call->tx_phase ||
 560             call->tx_hard_ack != 0 ||
 561             call->rx_hard_ack != 0 ||
 562             call->rx_top != 0)
 563                 return -EINVAL;
 564
 565         call->state = RXRPC_CALL_UNINITIALISED;
 566         call->completion = RXRPC_CALL_SUCCEEDED;
 567         call->call_id = 0;
 568         call->cid = 0;
 569         call->cong_cwnd = 0;
 570         call->cong_extra = 0;
 571         call->cong_ssthresh = 0;
 572         call->cong_mode = 0;
 573         call->cong_dup_acks = 0;
 574         call->cong_cumul_acks = 0;
 575         call->acks_lowest_nak = 0;
 576
 577         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 578                 last |= call->rxtx_annotations[i];
 579                 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST;
 580                 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS;
 581         }
 582
 583         _leave(" = 0");
 584         return 0;
 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;
 623         const void *here = __builtin_return_address(0);
 624         int n;
 625
 626         ASSERT(call != NULL);
 627
 628         n = atomic_dec_return(&call->usage);
 629         trace_rxrpc_call(call, op, n, here, NULL);
 630         ASSERTCMP(n, >=, 0);
 631         if (n == 0) {
 632                 _debug("call %d dead", call->debug_id);
 633                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 634
 635                 if (!list_empty(&call->link)) {
 636                         rxnet = rxrpc_net(sock_net(&call->socket->sk));
 637                         write_lock(&rxnet->call_lock);
 638                         list_del_init(&call->link);
 639                         write_unlock(&rxnet->call_lock);
 640                 }
 641
 642                 rxrpc_cleanup_call(call);
 643         }
 644 }
 645
 646 /*
 647  * Final call destruction under RCU.
 648  */
 649 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 650 {
 651         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 652
 653         rxrpc_put_connection(call->conn);
 654         rxrpc_put_peer(call->peer);
 655         kfree(call->rxtx_buffer);
 656         kfree(call->rxtx_annotations);
 657         kmem_cache_free(rxrpc_call_jar, call);
 658 }
 659
 660 /*
 661  * clean up a call
 662  */
 663 void rxrpc_cleanup_call(struct rxrpc_call *call)
 664 {
 665         int i;
 666
 667         _net("DESTROY CALL %d", call->debug_id);
 668
 669         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 670
 671         del_timer_sync(&call->timer);
 672
 673         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 674         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 675
 676         /* Clean up the Rx/Tx buffer */
 677         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
 678                 rxrpc_free_skb(call->rxtx_buffer[i],
 679                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 680                                 rxrpc_skb_rx_cleaned));
 681
 682         rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
 683
 684         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 685 }
 686
 687 /*
 688  * Make sure that all calls are gone from a network namespace.  To reach this
 689  * point, any open UDP sockets in that namespace must have been closed, so any
 690  * outstanding calls cannot be doing I/O.
 691  */
 692 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 693 {
 694         struct rxrpc_call *call;
 695
 696         _enter("");
 697
 698         if (!list_empty(&rxnet->calls)) {
 699                 write_lock(&rxnet->call_lock);
 700
 701                 while (!list_empty(&rxnet->calls)) {
 702                         call = list_entry(rxnet->calls.next,
 703                                           struct rxrpc_call, link);
 704                         _debug("Zapping call %p", call);
 705
 706                         rxrpc_see_call(call);
 707                         list_del_init(&call->link);
 708
 709                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 710                                call, atomic_read(&call->usage),
 711                                rxrpc_call_states[call->state],
 712                                call->flags, call->events);
 713
 714                         write_unlock(&rxnet->call_lock);
 715                         cond_resched();
 716                         write_lock(&rxnet->call_lock);
 717                 }
 718
 719                 write_unlock(&rxnet->call_lock);
 720         }
 721 }