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 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
  49 {
  50         struct rxrpc_local *local = call->local;
  51         bool busy;
  52
  53         if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
  54                 spin_lock_bh(&local->lock);
  55                 busy = !list_empty(&call->attend_link);
  56                 trace_rxrpc_poke_call(call, busy, what);
  57                 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
  58                         busy = true;
  59                 if (!busy) {
  60                         list_add_tail(&call->attend_link, &local->call_attend_q);
  61                 }
  62                 spin_unlock_bh(&local->lock);
  63                 if (!busy)
  64                         rxrpc_wake_up_io_thread(local);
  65         }
  66 }
  67
  68 static void rxrpc_call_timer_expired(struct timer_list *t)
  69 {
  70         struct rxrpc_call *call = from_timer(call, t, timer);
  71
  72         _enter("%d", call->debug_id);
  73
  74         if (!__rxrpc_call_is_complete(call)) {
  75                 trace_rxrpc_timer_expired(call, jiffies);
  76                 rxrpc_poke_call(call, rxrpc_call_poke_timer);
  77         }
  78 }
  79
  80 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
  81                              unsigned long expire_at,
  82                              unsigned long now,
  83                              enum rxrpc_timer_trace why)
  84 {
  85         trace_rxrpc_timer(call, why, now);
  86         timer_reduce(&call->timer, expire_at);
  87 }
  88
  89 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  90
  91 static void rxrpc_destroy_call(struct work_struct *);
  92
  93 /*
  94  * find an extant server call
  95  * - called in process context with IRQs enabled
  96  */
  97 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  98                                               unsigned long user_call_ID)
  99 {
 100         struct rxrpc_call *call;
 101         struct rb_node *p;
 102
 103         _enter("%p,%lx", rx, user_call_ID);
 104
 105         read_lock(&rx->call_lock);
 106
 107         p = rx->calls.rb_node;
 108         while (p) {
 109                 call = rb_entry(p, struct rxrpc_call, sock_node);
 110
 111                 if (user_call_ID < call->user_call_ID)
 112                         p = p->rb_left;
 113                 else if (user_call_ID > call->user_call_ID)
 114                         p = p->rb_right;
 115                 else
 116                         goto found_extant_call;
 117         }
 118
 119         read_unlock(&rx->call_lock);
 120         _leave(" = NULL");
 121         return NULL;
 122
 123 found_extant_call:
 124         rxrpc_get_call(call, rxrpc_call_get_sendmsg);
 125         read_unlock(&rx->call_lock);
 126         _leave(" = %p [%d]", call, refcount_read(&call->ref));
 127         return call;
 128 }
 129
 130 /*
 131  * allocate a new call
 132  */
 133 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 134                                     unsigned int debug_id)
 135 {
 136         struct rxrpc_call *call;
 137         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 138
 139         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 140         if (!call)
 141                 return NULL;
 142
 143         mutex_init(&call->user_mutex);
 144
 145         /* Prevent lockdep reporting a deadlock false positive between the afs
 146          * filesystem and sys_sendmsg() via the mmap sem.
 147          */
 148         if (rx->sk.sk_kern_sock)
 149                 lockdep_set_class(&call->user_mutex,
 150                                   &rxrpc_call_user_mutex_lock_class_key);
 151
 152         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 153         INIT_WORK(&call->destroyer, rxrpc_destroy_call);
 154         INIT_LIST_HEAD(&call->link);
 155         INIT_LIST_HEAD(&call->wait_link);
 156         INIT_LIST_HEAD(&call->accept_link);
 157         INIT_LIST_HEAD(&call->recvmsg_link);
 158         INIT_LIST_HEAD(&call->sock_link);
 159         INIT_LIST_HEAD(&call->attend_link);
 160         INIT_LIST_HEAD(&call->tx_sendmsg);
 161         INIT_LIST_HEAD(&call->tx_buffer);
 162         skb_queue_head_init(&call->recvmsg_queue);
 163         skb_queue_head_init(&call->rx_oos_queue);
 164         init_waitqueue_head(&call->waitq);
 165         spin_lock_init(&call->notify_lock);
 166         spin_lock_init(&call->tx_lock);
 167         refcount_set(&call->ref, 1);
 168         call->debug_id = debug_id;
 169         call->tx_total_len = -1;
 170         call->next_rx_timo = 20 * HZ;
 171         call->next_req_timo = 1 * HZ;
 172         call->ackr_window = 1;
 173         call->ackr_wtop = 1;
 174
 175         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 176
 177         call->rx_winsize = rxrpc_rx_window_size;
 178         call->tx_winsize = 16;
 179
 180         if (RXRPC_TX_SMSS > 2190)
 181                 call->cong_cwnd = 2;
 182         else if (RXRPC_TX_SMSS > 1095)
 183                 call->cong_cwnd = 3;
 184         else
 185                 call->cong_cwnd = 4;
 186         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 187
 188         call->rxnet = rxnet;
 189         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 190         atomic_inc(&rxnet->nr_calls);
 191         return call;
 192 }
 193
 194 /*
 195  * Allocate a new client call.
 196  */
 197 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 198                                                   struct sockaddr_rxrpc *srx,
 199                                                   struct rxrpc_conn_parameters *cp,
 200                                                   struct rxrpc_call_params *p,
 201                                                   gfp_t gfp,
 202                                                   unsigned int debug_id)
 203 {
 204         struct rxrpc_call *call;
 205         ktime_t now;
 206         int ret;
 207
 208         _enter("");
 209
 210         call = rxrpc_alloc_call(rx, gfp, debug_id);
 211         if (!call)
 212                 return ERR_PTR(-ENOMEM);
 213         now = ktime_get_real();
 214         call->acks_latest_ts    = now;
 215         call->cong_tstamp       = now;
 216         call->dest_srx          = *srx;
 217         call->interruptibility  = p->interruptibility;
 218         call->tx_total_len      = p->tx_total_len;
 219         call->key               = key_get(cp->key);
 220         call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
 221         call->security_level    = cp->security_level;
 222         if (p->kernel)
 223                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 224         if (cp->upgrade)
 225                 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
 226         if (cp->exclusive)
 227                 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 228
 229         ret = rxrpc_init_client_call_security(call);
 230         if (ret < 0) {
 231                 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
 232                 rxrpc_put_call(call, rxrpc_call_put_discard_error);
 233                 return ERR_PTR(ret);
 234         }
 235
 236         rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
 237
 238         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 239                          p->user_call_ID, rxrpc_call_new_client);
 240
 241         _leave(" = %p", call);
 242         return call;
 243 }
 244
 245 /*
 246  * Initiate the call ack/resend/expiry timer.
 247  */
 248 void rxrpc_start_call_timer(struct rxrpc_call *call)
 249 {
 250         unsigned long now = jiffies;
 251         unsigned long j = now + MAX_JIFFY_OFFSET;
 252
 253         call->delay_ack_at = j;
 254         call->ack_lost_at = j;
 255         call->resend_at = j;
 256         call->ping_at = j;
 257         call->keepalive_at = j;
 258         call->expect_rx_by = j;
 259         call->expect_req_by = j;
 260         call->expect_term_by = j;
 261         call->timer.expires = now;
 262 }
 263
 264 /*
 265  * Wait for a call slot to become available.
 266  */
 267 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 268 {
 269         struct semaphore *limiter = &rxrpc_call_limiter;
 270
 271         if (p->kernel)
 272                 limiter = &rxrpc_kernel_call_limiter;
 273         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 274                 down(limiter);
 275                 return limiter;
 276         }
 277         return down_interruptible(limiter) < 0 ? NULL : limiter;
 278 }
 279
 280 /*
 281  * Release a call slot.
 282  */
 283 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 284 {
 285         struct semaphore *limiter = &rxrpc_call_limiter;
 286
 287         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 288                 limiter = &rxrpc_kernel_call_limiter;
 289         up(limiter);
 290 }
 291
 292 /*
 293  * Start the process of connecting a call.  We obtain a peer and a connection
 294  * bundle, but the actual association of a call with a connection is offloaded
 295  * to the I/O thread to simplify locking.
 296  */
 297 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 298 {
 299         struct rxrpc_local *local = call->local;
 300         int ret = -ENOMEM;
 301
 302         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 303
 304         call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp);
 305         if (!call->peer)
 306                 goto error;
 307
 308         ret = rxrpc_look_up_bundle(call, gfp);
 309         if (ret < 0)
 310                 goto error;
 311
 312         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 313         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 314         spin_lock(&local->client_call_lock);
 315         list_add_tail(&call->wait_link, &local->new_client_calls);
 316         spin_unlock(&local->client_call_lock);
 317         rxrpc_wake_up_io_thread(local);
 318         return 0;
 319
 320 error:
 321         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 322         return ret;
 323 }
 324
 325 /*
 326  * Set up a call for the given parameters.
 327  * - Called with the socket lock held, which it must release.
 328  * - If it returns a call, the call's lock will need releasing by the caller.
 329  */
 330 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 331                                          struct rxrpc_conn_parameters *cp,
 332                                          struct sockaddr_rxrpc *srx,
 333                                          struct rxrpc_call_params *p,
 334                                          gfp_t gfp,
 335                                          unsigned int debug_id)
 336         __releases(&rx->sk.sk_lock.slock)
 337         __acquires(&call->user_mutex)
 338 {
 339         struct rxrpc_call *call, *xcall;
 340         struct rxrpc_net *rxnet;
 341         struct semaphore *limiter;
 342         struct rb_node *parent, **pp;
 343         int ret;
 344
 345         _enter("%p,%lx", rx, p->user_call_ID);
 346
 347         limiter = rxrpc_get_call_slot(p, gfp);
 348         if (!limiter) {
 349                 release_sock(&rx->sk);
 350                 return ERR_PTR(-ERESTARTSYS);
 351         }
 352
 353         call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id);
 354         if (IS_ERR(call)) {
 355                 release_sock(&rx->sk);
 356                 up(limiter);
 357                 _leave(" = %ld", PTR_ERR(call));
 358                 return call;
 359         }
 360
 361         /* We need to protect a partially set up call against the user as we
 362          * will be acting outside the socket lock.
 363          */
 364         mutex_lock(&call->user_mutex);
 365
 366         /* Publish the call, even though it is incompletely set up as yet */
 367         write_lock(&rx->call_lock);
 368
 369         pp = &rx->calls.rb_node;
 370         parent = NULL;
 371         while (*pp) {
 372                 parent = *pp;
 373                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 374
 375                 if (p->user_call_ID < xcall->user_call_ID)
 376                         pp = &(*pp)->rb_left;
 377                 else if (p->user_call_ID > xcall->user_call_ID)
 378                         pp = &(*pp)->rb_right;
 379                 else
 380                         goto error_dup_user_ID;
 381         }
 382
 383         rcu_assign_pointer(call->socket, rx);
 384         call->user_call_ID = p->user_call_ID;
 385         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 386         rxrpc_get_call(call, rxrpc_call_get_userid);
 387         rb_link_node(&call->sock_node, parent, pp);
 388         rb_insert_color(&call->sock_node, &rx->calls);
 389         list_add(&call->sock_link, &rx->sock_calls);
 390
 391         write_unlock(&rx->call_lock);
 392
 393         rxnet = call->rxnet;
 394         spin_lock(&rxnet->call_lock);
 395         list_add_tail_rcu(&call->link, &rxnet->calls);
 396         spin_unlock(&rxnet->call_lock);
 397
 398         /* From this point on, the call is protected by its own lock. */
 399         release_sock(&rx->sk);
 400
 401         /* Set up or get a connection record and set the protocol parameters,
 402          * including channel number and call ID.
 403          */
 404         ret = rxrpc_connect_call(call, gfp);
 405         if (ret < 0)
 406                 goto error_attached_to_socket;
 407
 408         _leave(" = %p [new]", call);
 409         return call;
 410
 411         /* We unexpectedly found the user ID in the list after taking
 412          * the call_lock.  This shouldn't happen unless the user races
 413          * with itself and tries to add the same user ID twice at the
 414          * same time in different threads.
 415          */
 416 error_dup_user_ID:
 417         write_unlock(&rx->call_lock);
 418         release_sock(&rx->sk);
 419         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 420         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 421                          rxrpc_call_see_userid_exists);
 422         mutex_unlock(&call->user_mutex);
 423         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 424         _leave(" = -EEXIST");
 425         return ERR_PTR(-EEXIST);
 426
 427         /* We got an error, but the call is attached to the socket and is in
 428          * need of release.  However, we might now race with recvmsg() when it
 429          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 430          * leave the error to recvmsg() to deal with.
 431          */
 432 error_attached_to_socket:
 433         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 434                          rxrpc_call_see_connect_failed);
 435         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 436         _leave(" = c=%08x [err]", call->debug_id);
 437         return call;
 438 }
 439
 440 /*
 441  * Set up an incoming call.  call->conn points to the connection.
 442  * This is called in BH context and isn't allowed to fail.
 443  */
 444 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 445                          struct rxrpc_call *call,
 446                          struct sk_buff *skb)
 447 {
 448         struct rxrpc_connection *conn = call->conn;
 449         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 450         u32 chan;
 451
 452         _enter(",%d", call->conn->debug_id);
 453
 454         rcu_assign_pointer(call->socket, rx);
 455         call->call_id           = sp->hdr.callNumber;
 456         call->dest_srx.srx_service = sp->hdr.serviceId;
 457         call->cid               = sp->hdr.cid;
 458         call->cong_tstamp       = skb->tstamp;
 459
 460         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 461         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 462
 463         spin_lock(&conn->state_lock);
 464
 465         switch (conn->state) {
 466         case RXRPC_CONN_SERVICE_UNSECURED:
 467         case RXRPC_CONN_SERVICE_CHALLENGING:
 468                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 469                 break;
 470         case RXRPC_CONN_SERVICE:
 471                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 472                 break;
 473
 474         case RXRPC_CONN_ABORTED:
 475                 rxrpc_set_call_completion(call, conn->completion,
 476                                           conn->abort_code, conn->error);
 477                 break;
 478         default:
 479                 BUG();
 480         }
 481
 482         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 483
 484         /* Set the channel for this call.  We don't get channel_lock as we're
 485          * only defending against the data_ready handler (which we're called
 486          * from) and the RESPONSE packet parser (which is only really
 487          * interested in call_counter and can cope with a disagreement with the
 488          * call pointer).
 489          */
 490         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 491         conn->channels[chan].call_counter = call->call_id;
 492         conn->channels[chan].call_id = call->call_id;
 493         conn->channels[chan].call = call;
 494         spin_unlock(&conn->state_lock);
 495
 496         spin_lock(&conn->peer->lock);
 497         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 498         spin_unlock(&conn->peer->lock);
 499
 500         rxrpc_start_call_timer(call);
 501         _leave("");
 502 }
 503
 504 /*
 505  * Note the re-emergence of a call.
 506  */
 507 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 508 {
 509         if (call) {
 510                 int r = refcount_read(&call->ref);
 511
 512                 trace_rxrpc_call(call->debug_id, r, 0, why);
 513         }
 514 }
 515
 516 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 517                                       enum rxrpc_call_trace why)
 518 {
 519         int r;
 520
 521         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 522                 return NULL;
 523         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 524         return call;
 525 }
 526
 527 /*
 528  * Note the addition of a ref on a call.
 529  */
 530 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 531 {
 532         int r;
 533
 534         __refcount_inc(&call->ref, &r);
 535         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 536 }
 537
 538 /*
 539  * Clean up the Rx skb ring.
 540  */
 541 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 542 {
 543         skb_queue_purge(&call->recvmsg_queue);
 544         skb_queue_purge(&call->rx_oos_queue);
 545 }
 546
 547 /*
 548  * Detach a call from its owning socket.
 549  */
 550 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 551 {
 552         struct rxrpc_connection *conn = call->conn;
 553         bool put = false, putu = false;
 554
 555         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 556
 557         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 558                          call->flags, rxrpc_call_see_release);
 559
 560         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 561                 BUG();
 562
 563         rxrpc_put_call_slot(call);
 564
 565         /* Make sure we don't get any more notifications */
 566         spin_lock(&rx->recvmsg_lock);
 567
 568         if (!list_empty(&call->recvmsg_link)) {
 569                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 570                        call, call->events, call->flags);
 571                 list_del(&call->recvmsg_link);
 572                 put = true;
 573         }
 574
 575         /* list_empty() must return false in rxrpc_notify_socket() */
 576         call->recvmsg_link.next = NULL;
 577         call->recvmsg_link.prev = NULL;
 578
 579         spin_unlock(&rx->recvmsg_lock);
 580         if (put)
 581                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 582
 583         write_lock(&rx->call_lock);
 584
 585         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 586                 rb_erase(&call->sock_node, &rx->calls);
 587                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 588                 putu = true;
 589         }
 590
 591         list_del(&call->sock_link);
 592         write_unlock(&rx->call_lock);
 593
 594         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 595
 596         if (putu)
 597                 rxrpc_put_call(call, rxrpc_call_put_userid);
 598
 599         _leave("");
 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_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 616                                     rxrpc_abort_call_sock_release_tba);
 617                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 618         }
 619
 620         while (!list_empty(&rx->sock_calls)) {
 621                 call = list_entry(rx->sock_calls.next,
 622                                   struct rxrpc_call, sock_link);
 623                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 624                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 625                                     rxrpc_abort_call_sock_release);
 626                 rxrpc_release_call(rx, call);
 627                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 628         }
 629
 630         _leave("");
 631 }
 632
 633 /*
 634  * release a call
 635  */
 636 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 637 {
 638         struct rxrpc_net *rxnet = call->rxnet;
 639         unsigned int debug_id = call->debug_id;
 640         bool dead;
 641         int r;
 642
 643         ASSERT(call != NULL);
 644
 645         dead = __refcount_dec_and_test(&call->ref, &r);
 646         trace_rxrpc_call(debug_id, r - 1, 0, why);
 647         if (dead) {
 648                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 649
 650                 if (!list_empty(&call->link)) {
 651                         spin_lock(&rxnet->call_lock);
 652                         list_del_init(&call->link);
 653                         spin_unlock(&rxnet->call_lock);
 654                 }
 655
 656                 rxrpc_cleanup_call(call);
 657         }
 658 }
 659
 660 /*
 661  * Free up the call under RCU.
 662  */
 663 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 664 {
 665         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 666         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 667
 668         kmem_cache_free(rxrpc_call_jar, call);
 669         if (atomic_dec_and_test(&rxnet->nr_calls))
 670                 wake_up_var(&rxnet->nr_calls);
 671 }
 672
 673 /*
 674  * Final call destruction - but must be done in process context.
 675  */
 676 static void rxrpc_destroy_call(struct work_struct *work)
 677 {
 678         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 679         struct rxrpc_txbuf *txb;
 680
 681         del_timer_sync(&call->timer);
 682
 683         rxrpc_cleanup_ring(call);
 684         while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
 685                                                struct rxrpc_txbuf, call_link))) {
 686                 list_del(&txb->call_link);
 687                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 688         }
 689         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 690                                                struct rxrpc_txbuf, call_link))) {
 691                 list_del(&txb->call_link);
 692                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 693         }
 694
 695         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 696         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 697         rxrpc_deactivate_bundle(call->bundle);
 698         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 699         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 700         rxrpc_put_local(call->local, rxrpc_local_put_call);
 701         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 702 }
 703
 704 /*
 705  * clean up a call
 706  */
 707 void rxrpc_cleanup_call(struct rxrpc_call *call)
 708 {
 709         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 710
 711         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 712         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 713
 714         del_timer(&call->timer);
 715
 716         if (rcu_read_lock_held())
 717                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 718                  * something that may be running/waiting there.
 719                  */
 720                 schedule_work(&call->destroyer);
 721         else
 722                 rxrpc_destroy_call(&call->destroyer);
 723 }
 724
 725 /*
 726  * Make sure that all calls are gone from a network namespace.  To reach this
 727  * point, any open UDP sockets in that namespace must have been closed, so any
 728  * outstanding calls cannot be doing I/O.
 729  */
 730 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 731 {
 732         struct rxrpc_call *call;
 733
 734         _enter("");
 735
 736         if (!list_empty(&rxnet->calls)) {
 737                 spin_lock(&rxnet->call_lock);
 738
 739                 while (!list_empty(&rxnet->calls)) {
 740                         call = list_entry(rxnet->calls.next,
 741                                           struct rxrpc_call, link);
 742                         _debug("Zapping call %p", call);
 743
 744                         rxrpc_see_call(call, rxrpc_call_see_zap);
 745                         list_del_init(&call->link);
 746
 747                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 748                                call, refcount_read(&call->ref),
 749                                rxrpc_call_states[__rxrpc_call_state(call)],
 750                                call->flags, call->events);
 751
 752                         spin_unlock(&rxnet->call_lock);
 753                         cond_resched();
 754                         spin_lock(&rxnet->call_lock);
 755                 }
 756
 757                 spin_unlock(&rxnet->call_lock);
 758         }
 759
 760         atomic_dec(&rxnet->nr_calls);
 761         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 762 }