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 DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
  44 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
  45
  46 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
  47 {
  48         struct rxrpc_local *local = call->local;
  49         bool busy;
  50
  51         if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
  52                 spin_lock_bh(&local->lock);
  53                 busy = !list_empty(&call->attend_link);
  54                 trace_rxrpc_poke_call(call, busy, what);
  55                 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
  56                         busy = true;
  57                 if (!busy) {
  58                         list_add_tail(&call->attend_link, &local->call_attend_q);
  59                 }
  60                 spin_unlock_bh(&local->lock);
  61                 if (!busy)
  62                         rxrpc_wake_up_io_thread(local);
  63         }
  64 }
  65
  66 static void rxrpc_call_timer_expired(struct timer_list *t)
  67 {
  68         struct rxrpc_call *call = from_timer(call, t, timer);
  69
  70         _enter("%d", call->debug_id);
  71
  72         if (!__rxrpc_call_is_complete(call)) {
  73                 trace_rxrpc_timer_expired(call);
  74                 rxrpc_poke_call(call, rxrpc_call_poke_timer);
  75         }
  76 }
  77
  78 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  79
  80 static void rxrpc_destroy_call(struct work_struct *);
  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_get_sendmsg);
 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         mutex_init(&call->user_mutex);
 133
 134         /* Prevent lockdep reporting a deadlock false positive between the afs
 135          * filesystem and sys_sendmsg() via the mmap sem.
 136          */
 137         if (rx->sk.sk_kern_sock)
 138                 lockdep_set_class(&call->user_mutex,
 139                                   &rxrpc_call_user_mutex_lock_class_key);
 140
 141         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 142         INIT_WORK(&call->destroyer, rxrpc_destroy_call);
 143         INIT_LIST_HEAD(&call->link);
 144         INIT_LIST_HEAD(&call->wait_link);
 145         INIT_LIST_HEAD(&call->accept_link);
 146         INIT_LIST_HEAD(&call->recvmsg_link);
 147         INIT_LIST_HEAD(&call->sock_link);
 148         INIT_LIST_HEAD(&call->attend_link);
 149         INIT_LIST_HEAD(&call->tx_sendmsg);
 150         INIT_LIST_HEAD(&call->tx_buffer);
 151         skb_queue_head_init(&call->recvmsg_queue);
 152         skb_queue_head_init(&call->rx_oos_queue);
 153         init_waitqueue_head(&call->waitq);
 154         spin_lock_init(&call->notify_lock);
 155         spin_lock_init(&call->tx_lock);
 156         refcount_set(&call->ref, 1);
 157         call->debug_id          = debug_id;
 158         call->tx_total_len      = -1;
 159         call->next_rx_timo      = 20 * HZ;
 160         call->next_req_timo     = 1 * HZ;
 161         call->ackr_window       = 1;
 162         call->ackr_wtop         = 1;
 163         call->delay_ack_at      = KTIME_MAX;
 164         call->ack_lost_at       = KTIME_MAX;
 165         call->resend_at         = KTIME_MAX;
 166         call->ping_at           = KTIME_MAX;
 167         call->keepalive_at      = KTIME_MAX;
 168         call->expect_rx_by      = KTIME_MAX;
 169         call->expect_req_by     = KTIME_MAX;
 170         call->expect_term_by    = KTIME_MAX;
 171
 172         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 173
 174         call->rx_winsize = rxrpc_rx_window_size;
 175         call->tx_winsize = 16;
 176
 177         call->cong_cwnd = RXRPC_MIN_CWND;
 178         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 179
 180         call->rxnet = rxnet;
 181         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 182         atomic_inc(&rxnet->nr_calls);
 183         return call;
 184 }
 185
 186 /*
 187  * Allocate a new client call.
 188  */
 189 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 190                                                   struct rxrpc_conn_parameters *cp,
 191                                                   struct rxrpc_call_params *p,
 192                                                   gfp_t gfp,
 193                                                   unsigned int debug_id)
 194 {
 195         struct rxrpc_call *call;
 196         ktime_t now;
 197         int ret;
 198
 199         _enter("");
 200
 201         call = rxrpc_alloc_call(rx, gfp, debug_id);
 202         if (!call)
 203                 return ERR_PTR(-ENOMEM);
 204         now = ktime_get_real();
 205         call->acks_latest_ts    = now;
 206         call->cong_tstamp       = now;
 207         call->dest_srx          = cp->peer->srx;
 208         call->dest_srx.srx_service = cp->service_id;
 209         call->interruptibility  = p->interruptibility;
 210         call->tx_total_len      = p->tx_total_len;
 211         call->key               = key_get(cp->key);
 212         call->peer              = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
 213         call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
 214         call->security_level    = cp->security_level;
 215         if (p->kernel)
 216                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 217         if (cp->upgrade)
 218                 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
 219         if (cp->exclusive)
 220                 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 221
 222         if (p->timeouts.normal)
 223                 call->next_rx_timo = min(p->timeouts.normal, 1);
 224         if (p->timeouts.idle)
 225                 call->next_req_timo = min(p->timeouts.idle, 1);
 226         if (p->timeouts.hard)
 227                 call->hard_timo = p->timeouts.hard;
 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         if (call->hard_timo) {
 251                 ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
 252
 253                 call->expect_term_by = ktime_add(ktime_get_real(), delay);
 254                 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
 255         }
 256         call->timer.expires = jiffies;
 257 }
 258
 259 /*
 260  * Wait for a call slot to become available.
 261  */
 262 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 263 {
 264         struct semaphore *limiter = &rxrpc_call_limiter;
 265
 266         if (p->kernel)
 267                 limiter = &rxrpc_kernel_call_limiter;
 268         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 269                 down(limiter);
 270                 return limiter;
 271         }
 272         return down_interruptible(limiter) < 0 ? NULL : limiter;
 273 }
 274
 275 /*
 276  * Release a call slot.
 277  */
 278 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 279 {
 280         struct semaphore *limiter = &rxrpc_call_limiter;
 281
 282         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 283                 limiter = &rxrpc_kernel_call_limiter;
 284         up(limiter);
 285 }
 286
 287 /*
 288  * Start the process of connecting a call.  We obtain a peer and a connection
 289  * bundle, but the actual association of a call with a connection is offloaded
 290  * to the I/O thread to simplify locking.
 291  */
 292 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 293 {
 294         struct rxrpc_local *local = call->local;
 295         int ret = -ENOMEM;
 296
 297         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 298
 299         ret = rxrpc_look_up_bundle(call, gfp);
 300         if (ret < 0)
 301                 goto error;
 302
 303         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 304         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 305         spin_lock(&local->client_call_lock);
 306         list_add_tail(&call->wait_link, &local->new_client_calls);
 307         spin_unlock(&local->client_call_lock);
 308         rxrpc_wake_up_io_thread(local);
 309         return 0;
 310
 311 error:
 312         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 313         return ret;
 314 }
 315
 316 /*
 317  * Set up a call for the given parameters.
 318  * - Called with the socket lock held, which it must release.
 319  * - If it returns a call, the call's lock will need releasing by the caller.
 320  */
 321 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 322                                          struct rxrpc_conn_parameters *cp,
 323                                          struct rxrpc_call_params *p,
 324                                          gfp_t gfp,
 325                                          unsigned int debug_id)
 326         __releases(&rx->sk.sk_lock.slock)
 327         __acquires(&call->user_mutex)
 328 {
 329         struct rxrpc_call *call, *xcall;
 330         struct rxrpc_net *rxnet;
 331         struct semaphore *limiter;
 332         struct rb_node *parent, **pp;
 333         int ret;
 334
 335         _enter("%p,%lx", rx, p->user_call_ID);
 336
 337         if (WARN_ON_ONCE(!cp->peer)) {
 338                 release_sock(&rx->sk);
 339                 return ERR_PTR(-EIO);
 340         }
 341
 342         limiter = rxrpc_get_call_slot(p, gfp);
 343         if (!limiter) {
 344                 release_sock(&rx->sk);
 345                 return ERR_PTR(-ERESTARTSYS);
 346         }
 347
 348         call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
 349         if (IS_ERR(call)) {
 350                 release_sock(&rx->sk);
 351                 up(limiter);
 352                 _leave(" = %ld", PTR_ERR(call));
 353                 return call;
 354         }
 355
 356         /* We need to protect a partially set up call against the user as we
 357          * will be acting outside the socket lock.
 358          */
 359         mutex_lock(&call->user_mutex);
 360
 361         /* Publish the call, even though it is incompletely set up as yet */
 362         write_lock(&rx->call_lock);
 363
 364         pp = &rx->calls.rb_node;
 365         parent = NULL;
 366         while (*pp) {
 367                 parent = *pp;
 368                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 369
 370                 if (p->user_call_ID < xcall->user_call_ID)
 371                         pp = &(*pp)->rb_left;
 372                 else if (p->user_call_ID > xcall->user_call_ID)
 373                         pp = &(*pp)->rb_right;
 374                 else
 375                         goto error_dup_user_ID;
 376         }
 377
 378         rcu_assign_pointer(call->socket, rx);
 379         call->user_call_ID = p->user_call_ID;
 380         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 381         rxrpc_get_call(call, rxrpc_call_get_userid);
 382         rb_link_node(&call->sock_node, parent, pp);
 383         rb_insert_color(&call->sock_node, &rx->calls);
 384         list_add(&call->sock_link, &rx->sock_calls);
 385
 386         write_unlock(&rx->call_lock);
 387
 388         rxnet = call->rxnet;
 389         spin_lock(&rxnet->call_lock);
 390         list_add_tail_rcu(&call->link, &rxnet->calls);
 391         spin_unlock(&rxnet->call_lock);
 392
 393         /* From this point on, the call is protected by its own lock. */
 394         release_sock(&rx->sk);
 395
 396         /* Set up or get a connection record and set the protocol parameters,
 397          * including channel number and call ID.
 398          */
 399         ret = rxrpc_connect_call(call, gfp);
 400         if (ret < 0)
 401                 goto error_attached_to_socket;
 402
 403         _leave(" = %p [new]", call);
 404         return call;
 405
 406         /* We unexpectedly found the user ID in the list after taking
 407          * the call_lock.  This shouldn't happen unless the user races
 408          * with itself and tries to add the same user ID twice at the
 409          * same time in different threads.
 410          */
 411 error_dup_user_ID:
 412         write_unlock(&rx->call_lock);
 413         release_sock(&rx->sk);
 414         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 415         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 416                          rxrpc_call_see_userid_exists);
 417         mutex_unlock(&call->user_mutex);
 418         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 419         _leave(" = -EEXIST");
 420         return ERR_PTR(-EEXIST);
 421
 422         /* We got an error, but the call is attached to the socket and is in
 423          * need of release.  However, we might now race with recvmsg() when it
 424          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 425          * leave the error to recvmsg() to deal with.
 426          */
 427 error_attached_to_socket:
 428         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 429                          rxrpc_call_see_connect_failed);
 430         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 431         _leave(" = c=%08x [err]", call->debug_id);
 432         return call;
 433 }
 434
 435 /*
 436  * Set up an incoming call.  call->conn points to the connection.
 437  * This is called in BH context and isn't allowed to fail.
 438  */
 439 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 440                          struct rxrpc_call *call,
 441                          struct sk_buff *skb)
 442 {
 443         struct rxrpc_connection *conn = call->conn;
 444         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 445         u32 chan;
 446
 447         _enter(",%d", call->conn->debug_id);
 448
 449         rcu_assign_pointer(call->socket, rx);
 450         call->call_id           = sp->hdr.callNumber;
 451         call->dest_srx.srx_service = sp->hdr.serviceId;
 452         call->cid               = sp->hdr.cid;
 453         call->cong_tstamp       = skb->tstamp;
 454
 455         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 456         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 457
 458         spin_lock(&conn->state_lock);
 459
 460         switch (conn->state) {
 461         case RXRPC_CONN_SERVICE_UNSECURED:
 462         case RXRPC_CONN_SERVICE_CHALLENGING:
 463                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 464                 break;
 465         case RXRPC_CONN_SERVICE:
 466                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 467                 break;
 468
 469         case RXRPC_CONN_ABORTED:
 470                 rxrpc_set_call_completion(call, conn->completion,
 471                                           conn->abort_code, conn->error);
 472                 break;
 473         default:
 474                 BUG();
 475         }
 476
 477         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 478
 479         /* Set the channel for this call.  We don't get channel_lock as we're
 480          * only defending against the data_ready handler (which we're called
 481          * from) and the RESPONSE packet parser (which is only really
 482          * interested in call_counter and can cope with a disagreement with the
 483          * call pointer).
 484          */
 485         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 486         conn->channels[chan].call_counter = call->call_id;
 487         conn->channels[chan].call_id = call->call_id;
 488         conn->channels[chan].call = call;
 489         spin_unlock(&conn->state_lock);
 490
 491         spin_lock(&conn->peer->lock);
 492         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 493         spin_unlock(&conn->peer->lock);
 494
 495         rxrpc_start_call_timer(call);
 496         _leave("");
 497 }
 498
 499 /*
 500  * Note the re-emergence of a call.
 501  */
 502 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 503 {
 504         if (call) {
 505                 int r = refcount_read(&call->ref);
 506
 507                 trace_rxrpc_call(call->debug_id, r, 0, why);
 508         }
 509 }
 510
 511 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 512                                       enum rxrpc_call_trace why)
 513 {
 514         int r;
 515
 516         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 517                 return NULL;
 518         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 519         return call;
 520 }
 521
 522 /*
 523  * Note the addition of a ref on a call.
 524  */
 525 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 526 {
 527         int r;
 528
 529         __refcount_inc(&call->ref, &r);
 530         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 531 }
 532
 533 /*
 534  * Clean up the Rx skb ring.
 535  */
 536 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 537 {
 538         rxrpc_purge_queue(&call->recvmsg_queue);
 539         rxrpc_purge_queue(&call->rx_oos_queue);
 540 }
 541
 542 /*
 543  * Detach a call from its owning socket.
 544  */
 545 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 546 {
 547         struct rxrpc_connection *conn = call->conn;
 548         bool put = false, putu = false;
 549
 550         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 551
 552         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 553                          call->flags, rxrpc_call_see_release);
 554
 555         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 556                 BUG();
 557
 558         rxrpc_put_call_slot(call);
 559
 560         /* Make sure we don't get any more notifications */
 561         spin_lock(&rx->recvmsg_lock);
 562
 563         if (!list_empty(&call->recvmsg_link)) {
 564                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 565                        call, call->events, call->flags);
 566                 list_del(&call->recvmsg_link);
 567                 put = true;
 568         }
 569
 570         /* list_empty() must return false in rxrpc_notify_socket() */
 571         call->recvmsg_link.next = NULL;
 572         call->recvmsg_link.prev = NULL;
 573
 574         spin_unlock(&rx->recvmsg_lock);
 575         if (put)
 576                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 577
 578         write_lock(&rx->call_lock);
 579
 580         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 581                 rb_erase(&call->sock_node, &rx->calls);
 582                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 583                 putu = true;
 584         }
 585
 586         list_del(&call->sock_link);
 587         write_unlock(&rx->call_lock);
 588
 589         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 590
 591         if (putu)
 592                 rxrpc_put_call(call, rxrpc_call_put_userid);
 593
 594         _leave("");
 595 }
 596
 597 /*
 598  * release all the calls associated with a socket
 599  */
 600 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 601 {
 602         struct rxrpc_call *call;
 603
 604         _enter("%p", rx);
 605
 606         while (!list_empty(&rx->to_be_accepted)) {
 607                 call = list_entry(rx->to_be_accepted.next,
 608                                   struct rxrpc_call, accept_link);
 609                 list_del(&call->accept_link);
 610                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 611                                     rxrpc_abort_call_sock_release_tba);
 612                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 613         }
 614
 615         while (!list_empty(&rx->sock_calls)) {
 616                 call = list_entry(rx->sock_calls.next,
 617                                   struct rxrpc_call, sock_link);
 618                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 619                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 620                                     rxrpc_abort_call_sock_release);
 621                 rxrpc_release_call(rx, call);
 622                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 623         }
 624
 625         _leave("");
 626 }
 627
 628 /*
 629  * release a call
 630  */
 631 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 632 {
 633         struct rxrpc_net *rxnet = call->rxnet;
 634         unsigned int debug_id = call->debug_id;
 635         bool dead;
 636         int r;
 637
 638         ASSERT(call != NULL);
 639
 640         dead = __refcount_dec_and_test(&call->ref, &r);
 641         trace_rxrpc_call(debug_id, r - 1, 0, why);
 642         if (dead) {
 643                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 644
 645                 if (!list_empty(&call->link)) {
 646                         spin_lock(&rxnet->call_lock);
 647                         list_del_init(&call->link);
 648                         spin_unlock(&rxnet->call_lock);
 649                 }
 650
 651                 rxrpc_cleanup_call(call);
 652         }
 653 }
 654
 655 /*
 656  * Free up the call under RCU.
 657  */
 658 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 659 {
 660         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 661         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 662
 663         kmem_cache_free(rxrpc_call_jar, call);
 664         if (atomic_dec_and_test(&rxnet->nr_calls))
 665                 wake_up_var(&rxnet->nr_calls);
 666 }
 667
 668 /*
 669  * Final call destruction - but must be done in process context.
 670  */
 671 static void rxrpc_destroy_call(struct work_struct *work)
 672 {
 673         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 674         struct rxrpc_txbuf *txb;
 675
 676         del_timer_sync(&call->timer);
 677
 678         rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
 679         rxrpc_cleanup_ring(call);
 680         while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
 681                                                struct rxrpc_txbuf, call_link))) {
 682                 list_del(&txb->call_link);
 683                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 684         }
 685         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 686                                                struct rxrpc_txbuf, call_link))) {
 687                 list_del(&txb->call_link);
 688                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 689         }
 690
 691         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 692         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 693         rxrpc_deactivate_bundle(call->bundle);
 694         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 695         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 696         rxrpc_put_local(call->local, rxrpc_local_put_call);
 697         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 698 }
 699
 700 /*
 701  * clean up a call
 702  */
 703 void rxrpc_cleanup_call(struct rxrpc_call *call)
 704 {
 705         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 706
 707         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 708         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 709
 710         del_timer(&call->timer);
 711
 712         if (rcu_read_lock_held())
 713                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 714                  * something that may be running/waiting there.
 715                  */
 716                 schedule_work(&call->destroyer);
 717         else
 718                 rxrpc_destroy_call(&call->destroyer);
 719 }
 720
 721 /*
 722  * Make sure that all calls are gone from a network namespace.  To reach this
 723  * point, any open UDP sockets in that namespace must have been closed, so any
 724  * outstanding calls cannot be doing I/O.
 725  */
 726 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 727 {
 728         struct rxrpc_call *call;
 729
 730         _enter("");
 731
 732         if (!list_empty(&rxnet->calls)) {
 733                 spin_lock(&rxnet->call_lock);
 734
 735                 while (!list_empty(&rxnet->calls)) {
 736                         call = list_entry(rxnet->calls.next,
 737                                           struct rxrpc_call, link);
 738                         _debug("Zapping call %p", call);
 739
 740                         rxrpc_see_call(call, rxrpc_call_see_zap);
 741                         list_del_init(&call->link);
 742
 743                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 744                                call, refcount_read(&call->ref),
 745                                rxrpc_call_states[__rxrpc_call_state(call)],
 746                                call->flags, call->events);
 747
 748                         spin_unlock(&rxnet->call_lock);
 749                         cond_resched();
 750                         spin_lock(&rxnet->call_lock);
 751                 }
 752
 753                 spin_unlock(&rxnet->call_lock);
 754         }
 755
 756         atomic_dec(&rxnet->nr_calls);
 757         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 758 }