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(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         }
  58 }
  59
  60 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  61
  62 /*
  63  * find an extant server call
  64  * - called in process context with IRQs enabled
  65  */
  66 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  67                                               unsigned long user_call_ID)
  68 {
  69         struct rxrpc_call *call;
  70         struct rb_node *p;
  71
  72         _enter("%p,%lx", rx, user_call_ID);
  73
  74         read_lock(&rx->call_lock);
  75
  76         p = rx->calls.rb_node;
  77         while (p) {
  78                 call = rb_entry(p, struct rxrpc_call, sock_node);
  79
  80                 if (user_call_ID < call->user_call_ID)
  81                         p = p->rb_left;
  82                 else if (user_call_ID > call->user_call_ID)
  83                         p = p->rb_right;
  84                 else
  85                         goto found_extant_call;
  86         }
  87
  88         read_unlock(&rx->call_lock);
  89         _leave(" = NULL");
  90         return NULL;
  91
  92 found_extant_call:
  93         rxrpc_get_call(call, rxrpc_call_got);
  94         read_unlock(&rx->call_lock);
  95         _leave(" = %p [%d]", call, atomic_read(&call->usage));
  96         return call;
  97 }
  98
  99 /*
 100  * allocate a new call
 101  */
 102 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 103                                     unsigned int debug_id)
 104 {
 105         struct rxrpc_call *call;
 106         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 107
 108         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 109         if (!call)
 110                 return NULL;
 111
 112         call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
 113                                     sizeof(struct sk_buff *),
 114                                     gfp);
 115         if (!call->rxtx_buffer)
 116                 goto nomem;
 117
 118         call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
 119         if (!call->rxtx_annotations)
 120                 goto nomem_2;
 121
 122         mutex_init(&call->user_mutex);
 123
 124         /* Prevent lockdep reporting a deadlock false positive between the afs
 125          * filesystem and sys_sendmsg() via the mmap sem.
 126          */
 127         if (rx->sk.sk_kern_sock)
 128                 lockdep_set_class(&call->user_mutex,
 129                                   &rxrpc_call_user_mutex_lock_class_key);
 130
 131         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 132         INIT_WORK(&call->processor, &rxrpc_process_call);
 133         INIT_LIST_HEAD(&call->link);
 134         INIT_LIST_HEAD(&call->chan_wait_link);
 135         INIT_LIST_HEAD(&call->accept_link);
 136         INIT_LIST_HEAD(&call->recvmsg_link);
 137         INIT_LIST_HEAD(&call->sock_link);
 138         init_waitqueue_head(&call->waitq);
 139         spin_lock_init(&call->lock);
 140         spin_lock_init(&call->notify_lock);
 141         spin_lock_init(&call->input_lock);
 142         rwlock_init(&call->state_lock);
 143         atomic_set(&call->usage, 1);
 144         call->debug_id = debug_id;
 145         call->tx_total_len = -1;
 146         call->next_rx_timo = 20 * HZ;
 147         call->next_req_timo = 1 * HZ;
 148
 149         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 150
 151         /* Leave space in the ring to handle a maxed-out jumbo packet */
 152         call->rx_winsize = rxrpc_rx_window_size;
 153         call->tx_winsize = 16;
 154         call->rx_expect_next = 1;
 155
 156         call->cong_cwnd = 2;
 157         call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
 158
 159         call->rxnet = rxnet;
 160         atomic_inc(&rxnet->nr_calls);
 161         return call;
 162
 163 nomem_2:
 164         kfree(call->rxtx_buffer);
 165 nomem:
 166         kmem_cache_free(rxrpc_call_jar, call);
 167         return NULL;
 168 }
 169
 170 /*
 171  * Allocate a new client call.
 172  */
 173 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 174                                                   struct sockaddr_rxrpc *srx,
 175                                                   gfp_t gfp,
 176                                                   unsigned int debug_id)
 177 {
 178         struct rxrpc_call *call;
 179         ktime_t now;
 180
 181         _enter("");
 182
 183         call = rxrpc_alloc_call(rx, gfp, debug_id);
 184         if (!call)
 185                 return ERR_PTR(-ENOMEM);
 186         call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
 187         call->service_id = srx->srx_service;
 188         call->tx_phase = true;
 189         now = ktime_get_real();
 190         call->acks_latest_ts = now;
 191         call->cong_tstamp = now;
 192
 193         _leave(" = %p", call);
 194         return call;
 195 }
 196
 197 /*
 198  * Initiate the call ack/resend/expiry timer.
 199  */
 200 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 201 {
 202         unsigned long now = jiffies;
 203         unsigned long j = now + MAX_JIFFY_OFFSET;
 204
 205         call->ack_at = j;
 206         call->ack_lost_at = j;
 207         call->resend_at = j;
 208         call->ping_at = j;
 209         call->expect_rx_by = j;
 210         call->expect_req_by = j;
 211         call->expect_term_by = j;
 212         call->timer.expires = now;
 213 }
 214
 215 /*
 216  * Set up a call for the given parameters.
 217  * - Called with the socket lock held, which it must release.
 218  * - If it returns a call, the call's lock will need releasing by the caller.
 219  */
 220 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 221                                          struct rxrpc_conn_parameters *cp,
 222                                          struct sockaddr_rxrpc *srx,
 223                                          struct rxrpc_call_params *p,
 224                                          gfp_t gfp,
 225                                          unsigned int debug_id)
 226         __releases(&rx->sk.sk_lock.slock)
 227         __acquires(&call->user_mutex)
 228 {
 229         struct rxrpc_call *call, *xcall;
 230         struct rxrpc_net *rxnet;
 231         struct rb_node *parent, **pp;
 232         const void *here = __builtin_return_address(0);
 233         int ret;
 234
 235         _enter("%p,%lx", rx, p->user_call_ID);
 236
 237         call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
 238         if (IS_ERR(call)) {
 239                 release_sock(&rx->sk);
 240                 _leave(" = %ld", PTR_ERR(call));
 241                 return call;
 242         }
 243
 244         call->tx_total_len = p->tx_total_len;
 245         trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
 246                          here, (const void *)p->user_call_ID);
 247
 248         /* We need to protect a partially set up call against the user as we
 249          * will be acting outside the socket lock.
 250          */
 251         mutex_lock(&call->user_mutex);
 252
 253         /* Publish the call, even though it is incompletely set up as yet */
 254         write_lock(&rx->call_lock);
 255
 256         pp = &rx->calls.rb_node;
 257         parent = NULL;
 258         while (*pp) {
 259                 parent = *pp;
 260                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 261
 262                 if (p->user_call_ID < xcall->user_call_ID)
 263                         pp = &(*pp)->rb_left;
 264                 else if (p->user_call_ID > xcall->user_call_ID)
 265                         pp = &(*pp)->rb_right;
 266                 else
 267                         goto error_dup_user_ID;
 268         }
 269
 270         rcu_assign_pointer(call->socket, rx);
 271         call->user_call_ID = p->user_call_ID;
 272         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 273         rxrpc_get_call(call, rxrpc_call_got_userid);
 274         rb_link_node(&call->sock_node, parent, pp);
 275         rb_insert_color(&call->sock_node, &rx->calls);
 276         list_add(&call->sock_link, &rx->sock_calls);
 277
 278         write_unlock(&rx->call_lock);
 279
 280         rxnet = call->rxnet;
 281         write_lock(&rxnet->call_lock);
 282         list_add_tail(&call->link, &rxnet->calls);
 283         write_unlock(&rxnet->call_lock);
 284
 285         /* From this point on, the call is protected by its own lock. */
 286         release_sock(&rx->sk);
 287
 288         /* Set up or get a connection record and set the protocol parameters,
 289          * including channel number and call ID.
 290          */
 291         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
 292         if (ret < 0)
 293                 goto error_attached_to_socket;
 294
 295         trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
 296                          here, NULL);
 297
 298         rxrpc_start_call_timer(call);
 299
 300         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 301
 302         _leave(" = %p [new]", call);
 303         return call;
 304
 305         /* We unexpectedly found the user ID in the list after taking
 306          * the call_lock.  This shouldn't happen unless the user races
 307          * with itself and tries to add the same user ID twice at the
 308          * same time in different threads.
 309          */
 310 error_dup_user_ID:
 311         write_unlock(&rx->call_lock);
 312         release_sock(&rx->sk);
 313         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 314                                     RX_CALL_DEAD, -EEXIST);
 315         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 316                          here, ERR_PTR(-EEXIST));
 317         rxrpc_release_call(rx, call);
 318         mutex_unlock(&call->user_mutex);
 319         rxrpc_put_call(call, rxrpc_call_put);
 320         _leave(" = -EEXIST");
 321         return ERR_PTR(-EEXIST);
 322
 323         /* We got an error, but the call is attached to the socket and is in
 324          * need of release.  However, we might now race with recvmsg() when
 325          * completing the call queues it.  Return 0 from sys_sendmsg() and
 326          * leave the error to recvmsg() to deal with.
 327          */
 328 error_attached_to_socket:
 329         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 330                          here, ERR_PTR(ret));
 331         set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 332         __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 333                                     RX_CALL_DEAD, ret);
 334         _leave(" = c=%08x [err]", call->debug_id);
 335         return call;
 336 }
 337
 338 /*
 339  * Retry a call to a new address.  It is expected that the Tx queue of the call
 340  * will contain data previously packaged for an old call.
 341  */
 342 int rxrpc_retry_client_call(struct rxrpc_sock *rx,
 343                             struct rxrpc_call *call,
 344                             struct rxrpc_conn_parameters *cp,
 345                             struct sockaddr_rxrpc *srx,
 346                             gfp_t gfp)
 347 {
 348         const void *here = __builtin_return_address(0);
 349         int ret;
 350
 351         /* Set up or get a connection record and set the protocol parameters,
 352          * including channel number and call ID.
 353          */
 354         ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
 355         if (ret < 0)
 356                 goto error;
 357
 358         trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
 359                          here, NULL);
 360
 361         rxrpc_start_call_timer(call);
 362
 363         _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
 364
 365         if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
 366                 rxrpc_queue_call(call);
 367
 368         _leave(" = 0");
 369         return 0;
 370
 371 error:
 372         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
 373                                   RX_CALL_DEAD, ret);
 374         trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
 375                          here, ERR_PTR(ret));
 376         _leave(" = %d", ret);
 377         return ret;
 378 }
 379
 380 /*
 381  * Set up an incoming call.  call->conn points to the connection.
 382  * This is called in BH context and isn't allowed to fail.
 383  */
 384 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 385                          struct rxrpc_call *call,
 386                          struct sk_buff *skb)
 387 {
 388         struct rxrpc_connection *conn = call->conn;
 389         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 390         u32 chan;
 391
 392         _enter(",%d", call->conn->debug_id);
 393
 394         rcu_assign_pointer(call->socket, rx);
 395         call->call_id           = sp->hdr.callNumber;
 396         call->service_id        = sp->hdr.serviceId;
 397         call->cid               = sp->hdr.cid;
 398         call->state             = RXRPC_CALL_SERVER_ACCEPTING;
 399         if (sp->hdr.securityIndex > 0)
 400                 call->state     = RXRPC_CALL_SERVER_SECURING;
 401         call->cong_tstamp       = skb->tstamp;
 402
 403         /* Set the channel for this call.  We don't get channel_lock as we're
 404          * only defending against the data_ready handler (which we're called
 405          * from) and the RESPONSE packet parser (which is only really
 406          * interested in call_counter and can cope with a disagreement with the
 407          * call pointer).
 408          */
 409         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 410         conn->channels[chan].call_counter = call->call_id;
 411         conn->channels[chan].call_id = call->call_id;
 412         rcu_assign_pointer(conn->channels[chan].call, call);
 413
 414         spin_lock(&conn->params.peer->lock);
 415         hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
 416         spin_unlock(&conn->params.peer->lock);
 417
 418         _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
 419
 420         rxrpc_start_call_timer(call);
 421         _leave("");
 422 }
 423
 424 /*
 425  * Queue a call's work processor, getting a ref to pass to the work queue.
 426  */
 427 bool rxrpc_queue_call(struct rxrpc_call *call)
 428 {
 429         const void *here = __builtin_return_address(0);
 430         int n = atomic_fetch_add_unless(&call->usage, 1, 0);
 431         if (n == 0)
 432                 return false;
 433         if (rxrpc_queue_work(&call->processor))
 434                 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
 435         else
 436                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 437         return true;
 438 }
 439
 440 /*
 441  * Queue a call's work processor, passing the callers ref 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 = atomic_read(&call->usage);
 447         ASSERTCMP(n, >=, 1);
 448         if (rxrpc_queue_work(&call->processor))
 449                 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
 450         else
 451                 rxrpc_put_call(call, rxrpc_call_put_noqueue);
 452         return true;
 453 }
 454
 455 /*
 456  * Note the re-emergence of a call.
 457  */
 458 void rxrpc_see_call(struct rxrpc_call *call)
 459 {
 460         const void *here = __builtin_return_address(0);
 461         if (call) {
 462                 int n = atomic_read(&call->usage);
 463
 464                 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
 465         }
 466 }
 467
 468 /*
 469  * Note the addition of a ref on a call.
 470  */
 471 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 472 {
 473         const void *here = __builtin_return_address(0);
 474         int n = atomic_inc_return(&call->usage);
 475
 476         trace_rxrpc_call(call, op, n, here, NULL);
 477 }
 478
 479 /*
 480  * Detach a call from its owning socket.
 481  */
 482 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 483 {
 484         const void *here = __builtin_return_address(0);
 485         struct rxrpc_connection *conn = call->conn;
 486         bool put = false;
 487         int i;
 488
 489         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 490
 491         trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
 492                          here, (const void *)call->flags);
 493
 494         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 495
 496         spin_lock_bh(&call->lock);
 497         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 498                 BUG();
 499         spin_unlock_bh(&call->lock);
 500
 501         del_timer_sync(&call->timer);
 502
 503         /* Make sure we don't get any more notifications */
 504         write_lock_bh(&rx->recvmsg_lock);
 505
 506         if (!list_empty(&call->recvmsg_link)) {
 507                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 508                        call, call->events, call->flags);
 509                 list_del(&call->recvmsg_link);
 510                 put = true;
 511         }
 512
 513         /* list_empty() must return false in rxrpc_notify_socket() */
 514         call->recvmsg_link.next = NULL;
 515         call->recvmsg_link.prev = NULL;
 516
 517         write_unlock_bh(&rx->recvmsg_lock);
 518         if (put)
 519                 rxrpc_put_call(call, rxrpc_call_put);
 520
 521         write_lock(&rx->call_lock);
 522
 523         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 524                 rb_erase(&call->sock_node, &rx->calls);
 525                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 526                 rxrpc_put_call(call, rxrpc_call_put_userid);
 527         }
 528
 529         list_del(&call->sock_link);
 530         write_unlock(&rx->call_lock);
 531
 532         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 533
 534         if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
 535                 rxrpc_disconnect_call(call);
 536
 537         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 538                 rxrpc_free_skb(call->rxtx_buffer[i],
 539                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 540                                 rxrpc_skb_rx_cleaned));
 541                 call->rxtx_buffer[i] = NULL;
 542         }
 543
 544         _leave("");
 545 }
 546
 547 /*
 548  * Prepare a kernel service call for retry.
 549  */
 550 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call)
 551 {
 552         const void *here = __builtin_return_address(0);
 553         int i;
 554         u8 last = 0;
 555
 556         _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
 557
 558         trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
 559                          here, (const void *)call->flags);
 560
 561         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 562         ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED);
 563         ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED);
 564         ASSERT(list_empty(&call->recvmsg_link));
 565
 566         del_timer_sync(&call->timer);
 567
 568         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn);
 569
 570         if (call->conn)
 571                 rxrpc_disconnect_call(call);
 572
 573         if (rxrpc_is_service_call(call) ||
 574             !call->tx_phase ||
 575             call->tx_hard_ack != 0 ||
 576             call->rx_hard_ack != 0 ||
 577             call->rx_top != 0)
 578                 return -EINVAL;
 579
 580         call->state = RXRPC_CALL_UNINITIALISED;
 581         call->completion = RXRPC_CALL_SUCCEEDED;
 582         call->call_id = 0;
 583         call->cid = 0;
 584         call->cong_cwnd = 0;
 585         call->cong_extra = 0;
 586         call->cong_ssthresh = 0;
 587         call->cong_mode = 0;
 588         call->cong_dup_acks = 0;
 589         call->cong_cumul_acks = 0;
 590         call->acks_lowest_nak = 0;
 591
 592         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
 593                 last |= call->rxtx_annotations[i];
 594                 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST;
 595                 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS;
 596         }
 597
 598         _leave(" = 0");
 599         return 0;
 600 }
 601
 602 /*
 603  * release all the calls associated with a socket
 604  */
 605 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 606 {
 607         struct rxrpc_call *call;
 608
 609         _enter("%p", rx);
 610
 611         while (!list_empty(&rx->to_be_accepted)) {
 612                 call = list_entry(rx->to_be_accepted.next,
 613                                   struct rxrpc_call, accept_link);
 614                 list_del(&call->accept_link);
 615                 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
 616                 rxrpc_put_call(call, rxrpc_call_put);
 617         }
 618
 619         while (!list_empty(&rx->sock_calls)) {
 620                 call = list_entry(rx->sock_calls.next,
 621                                   struct rxrpc_call, sock_link);
 622                 rxrpc_get_call(call, rxrpc_call_got);
 623                 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
 624                 rxrpc_send_abort_packet(call);
 625                 rxrpc_release_call(rx, call);
 626                 rxrpc_put_call(call, rxrpc_call_put);
 627         }
 628
 629         _leave("");
 630 }
 631
 632 /*
 633  * release a call
 634  */
 635 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
 636 {
 637         struct rxrpc_net *rxnet = call->rxnet;
 638         const void *here = __builtin_return_address(0);
 639         int n;
 640
 641         ASSERT(call != NULL);
 642
 643         n = atomic_dec_return(&call->usage);
 644         trace_rxrpc_call(call, op, n, here, NULL);
 645         ASSERTCMP(n, >=, 0);
 646         if (n == 0) {
 647                 _debug("call %d dead", call->debug_id);
 648                 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 649
 650                 if (!list_empty(&call->link)) {
 651                         write_lock(&rxnet->call_lock);
 652                         list_del_init(&call->link);
 653                         write_unlock(&rxnet->call_lock);
 654                 }
 655
 656                 rxrpc_cleanup_call(call);
 657         }
 658 }
 659
 660 /*
 661  * Final call destruction - but must be done in process context.
 662  */
 663 static void rxrpc_destroy_call(struct work_struct *work)
 664 {
 665         struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
 666         struct rxrpc_net *rxnet = call->rxnet;
 667
 668         rxrpc_put_connection(call->conn);
 669         rxrpc_put_peer(call->peer);
 670         kfree(call->rxtx_buffer);
 671         kfree(call->rxtx_annotations);
 672         kmem_cache_free(rxrpc_call_jar, call);
 673         if (atomic_dec_and_test(&rxnet->nr_calls))
 674                 wake_up_var(&rxnet->nr_calls);
 675 }
 676
 677 /*
 678  * Final call destruction under RCU.
 679  */
 680 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
 681 {
 682         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 683
 684         if (in_softirq()) {
 685                 INIT_WORK(&call->processor, rxrpc_destroy_call);
 686                 if (!rxrpc_queue_work(&call->processor))
 687                         BUG();
 688         } else {
 689                 rxrpc_destroy_call(&call->processor);
 690         }
 691 }
 692
 693 /*
 694  * clean up a call
 695  */
 696 void rxrpc_cleanup_call(struct rxrpc_call *call)
 697 {
 698         int i;
 699
 700         _net("DESTROY CALL %d", call->debug_id);
 701
 702         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 703
 704         del_timer_sync(&call->timer);
 705
 706         ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
 707         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 708
 709         /* Clean up the Rx/Tx buffer */
 710         for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
 711                 rxrpc_free_skb(call->rxtx_buffer[i],
 712                                (call->tx_phase ? rxrpc_skb_tx_cleaned :
 713                                 rxrpc_skb_rx_cleaned));
 714
 715         rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
 716
 717         call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
 718 }
 719
 720 /*
 721  * Make sure that all calls are gone from a network namespace.  To reach this
 722  * point, any open UDP sockets in that namespace must have been closed, so any
 723  * outstanding calls cannot be doing I/O.
 724  */
 725 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 726 {
 727         struct rxrpc_call *call;
 728
 729         _enter("");
 730
 731         if (!list_empty(&rxnet->calls)) {
 732                 write_lock(&rxnet->call_lock);
 733
 734                 while (!list_empty(&rxnet->calls)) {
 735                         call = list_entry(rxnet->calls.next,
 736                                           struct rxrpc_call, link);
 737                         _debug("Zapping call %p", call);
 738
 739                         rxrpc_see_call(call);
 740                         list_del_init(&call->link);
 741
 742                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 743                                call, atomic_read(&call->usage),
 744                                rxrpc_call_states[call->state],
 745                                call->flags, call->events);
 746
 747                         write_unlock(&rxnet->call_lock);
 748                         cond_resched();
 749                         write_lock(&rxnet->call_lock);
 750                 }
 751
 752                 write_unlock(&rxnet->call_lock);
 753         }
 754
 755         atomic_dec(&rxnet->nr_calls);
 756         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 757 }