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, jiffies);
  74                 rxrpc_poke_call(call, rxrpc_call_poke_timer);
  75         }
  76 }
  77
  78 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
  79                              unsigned long expire_at,
  80                              unsigned long now,
  81                              enum rxrpc_timer_trace why)
  82 {
  83         trace_rxrpc_timer(call, why, now);
  84         timer_reduce(&call->timer, expire_at);
  85 }
  86
  87 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
  88
  89 static void rxrpc_destroy_call(struct work_struct *);
  90
  91 /*
  92  * find an extant server call
  93  * - called in process context with IRQs enabled
  94  */
  95 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
  96                                               unsigned long user_call_ID)
  97 {
  98         struct rxrpc_call *call;
  99         struct rb_node *p;
 100
 101         _enter("%p,%lx", rx, user_call_ID);
 102
 103         read_lock(&rx->call_lock);
 104
 105         p = rx->calls.rb_node;
 106         while (p) {
 107                 call = rb_entry(p, struct rxrpc_call, sock_node);
 108
 109                 if (user_call_ID < call->user_call_ID)
 110                         p = p->rb_left;
 111                 else if (user_call_ID > call->user_call_ID)
 112                         p = p->rb_right;
 113                 else
 114                         goto found_extant_call;
 115         }
 116
 117         read_unlock(&rx->call_lock);
 118         _leave(" = NULL");
 119         return NULL;
 120
 121 found_extant_call:
 122         rxrpc_get_call(call, rxrpc_call_get_sendmsg);
 123         read_unlock(&rx->call_lock);
 124         _leave(" = %p [%d]", call, refcount_read(&call->ref));
 125         return call;
 126 }
 127
 128 /*
 129  * allocate a new call
 130  */
 131 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 132                                     unsigned int debug_id)
 133 {
 134         struct rxrpc_call *call;
 135         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 136
 137         call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
 138         if (!call)
 139                 return NULL;
 140
 141         mutex_init(&call->user_mutex);
 142
 143         /* Prevent lockdep reporting a deadlock false positive between the afs
 144          * filesystem and sys_sendmsg() via the mmap sem.
 145          */
 146         if (rx->sk.sk_kern_sock)
 147                 lockdep_set_class(&call->user_mutex,
 148                                   &rxrpc_call_user_mutex_lock_class_key);
 149
 150         timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 151         INIT_WORK(&call->destroyer, rxrpc_destroy_call);
 152         INIT_LIST_HEAD(&call->link);
 153         INIT_LIST_HEAD(&call->wait_link);
 154         INIT_LIST_HEAD(&call->accept_link);
 155         INIT_LIST_HEAD(&call->recvmsg_link);
 156         INIT_LIST_HEAD(&call->sock_link);
 157         INIT_LIST_HEAD(&call->attend_link);
 158         INIT_LIST_HEAD(&call->tx_sendmsg);
 159         INIT_LIST_HEAD(&call->tx_buffer);
 160         skb_queue_head_init(&call->recvmsg_queue);
 161         skb_queue_head_init(&call->rx_oos_queue);
 162         init_waitqueue_head(&call->waitq);
 163         spin_lock_init(&call->notify_lock);
 164         spin_lock_init(&call->tx_lock);
 165         refcount_set(&call->ref, 1);
 166         call->debug_id = debug_id;
 167         call->tx_total_len = -1;
 168         call->next_rx_timo = 20 * HZ;
 169         call->next_req_timo = 1 * HZ;
 170         call->ackr_window = 1;
 171         call->ackr_wtop = 1;
 172
 173         memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 174
 175         call->rx_winsize = rxrpc_rx_window_size;
 176         call->tx_winsize = 16;
 177
 178         if (RXRPC_TX_SMSS > 2190)
 179                 call->cong_cwnd = 2;
 180         else if (RXRPC_TX_SMSS > 1095)
 181                 call->cong_cwnd = 3;
 182         else
 183                 call->cong_cwnd = 4;
 184         call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
 185
 186         call->rxnet = rxnet;
 187         call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
 188         atomic_inc(&rxnet->nr_calls);
 189         return call;
 190 }
 191
 192 /*
 193  * Allocate a new client call.
 194  */
 195 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 196                                                   struct sockaddr_rxrpc *srx,
 197                                                   struct rxrpc_conn_parameters *cp,
 198                                                   struct rxrpc_call_params *p,
 199                                                   gfp_t gfp,
 200                                                   unsigned int debug_id)
 201 {
 202         struct rxrpc_call *call;
 203         ktime_t now;
 204         int ret;
 205
 206         _enter("");
 207
 208         call = rxrpc_alloc_call(rx, gfp, debug_id);
 209         if (!call)
 210                 return ERR_PTR(-ENOMEM);
 211         now = ktime_get_real();
 212         call->acks_latest_ts    = now;
 213         call->cong_tstamp       = now;
 214         call->dest_srx          = *srx;
 215         call->interruptibility  = p->interruptibility;
 216         call->tx_total_len      = p->tx_total_len;
 217         call->key               = key_get(cp->key);
 218         call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
 219         call->security_level    = cp->security_level;
 220         if (p->kernel)
 221                 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
 222         if (cp->upgrade)
 223                 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
 224         if (cp->exclusive)
 225                 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 226
 227         if (p->timeouts.normal)
 228                 call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL);
 229         if (p->timeouts.idle)
 230                 call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL);
 231         if (p->timeouts.hard)
 232                 call->hard_timo = p->timeouts.hard * HZ;
 233
 234         ret = rxrpc_init_client_call_security(call);
 235         if (ret < 0) {
 236                 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
 237                 rxrpc_put_call(call, rxrpc_call_put_discard_error);
 238                 return ERR_PTR(ret);
 239         }
 240
 241         rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
 242
 243         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 244                          p->user_call_ID, rxrpc_call_new_client);
 245
 246         _leave(" = %p", call);
 247         return call;
 248 }
 249
 250 /*
 251  * Initiate the call ack/resend/expiry timer.
 252  */
 253 void rxrpc_start_call_timer(struct rxrpc_call *call)
 254 {
 255         unsigned long now = jiffies;
 256         unsigned long j = now + MAX_JIFFY_OFFSET;
 257
 258         call->delay_ack_at = j;
 259         call->ack_lost_at = j;
 260         call->resend_at = j;
 261         call->ping_at = j;
 262         call->keepalive_at = j;
 263         call->expect_rx_by = j;
 264         call->expect_req_by = j;
 265         call->expect_term_by = j + call->hard_timo;
 266         call->timer.expires = now;
 267 }
 268
 269 /*
 270  * Wait for a call slot to become available.
 271  */
 272 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 273 {
 274         struct semaphore *limiter = &rxrpc_call_limiter;
 275
 276         if (p->kernel)
 277                 limiter = &rxrpc_kernel_call_limiter;
 278         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 279                 down(limiter);
 280                 return limiter;
 281         }
 282         return down_interruptible(limiter) < 0 ? NULL : limiter;
 283 }
 284
 285 /*
 286  * Release a call slot.
 287  */
 288 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 289 {
 290         struct semaphore *limiter = &rxrpc_call_limiter;
 291
 292         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 293                 limiter = &rxrpc_kernel_call_limiter;
 294         up(limiter);
 295 }
 296
 297 /*
 298  * Start the process of connecting a call.  We obtain a peer and a connection
 299  * bundle, but the actual association of a call with a connection is offloaded
 300  * to the I/O thread to simplify locking.
 301  */
 302 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 303 {
 304         struct rxrpc_local *local = call->local;
 305         int ret = -ENOMEM;
 306
 307         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 308
 309         call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp);
 310         if (!call->peer)
 311                 goto error;
 312
 313         ret = rxrpc_look_up_bundle(call, gfp);
 314         if (ret < 0)
 315                 goto error;
 316
 317         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 318         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 319         spin_lock(&local->client_call_lock);
 320         list_add_tail(&call->wait_link, &local->new_client_calls);
 321         spin_unlock(&local->client_call_lock);
 322         rxrpc_wake_up_io_thread(local);
 323         return 0;
 324
 325 error:
 326         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 327         return ret;
 328 }
 329
 330 /*
 331  * Set up a call for the given parameters.
 332  * - Called with the socket lock held, which it must release.
 333  * - If it returns a call, the call's lock will need releasing by the caller.
 334  */
 335 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 336                                          struct rxrpc_conn_parameters *cp,
 337                                          struct sockaddr_rxrpc *srx,
 338                                          struct rxrpc_call_params *p,
 339                                          gfp_t gfp,
 340                                          unsigned int debug_id)
 341         __releases(&rx->sk.sk_lock.slock)
 342         __acquires(&call->user_mutex)
 343 {
 344         struct rxrpc_call *call, *xcall;
 345         struct rxrpc_net *rxnet;
 346         struct semaphore *limiter;
 347         struct rb_node *parent, **pp;
 348         int ret;
 349
 350         _enter("%p,%lx", rx, p->user_call_ID);
 351
 352         limiter = rxrpc_get_call_slot(p, gfp);
 353         if (!limiter) {
 354                 release_sock(&rx->sk);
 355                 return ERR_PTR(-ERESTARTSYS);
 356         }
 357
 358         call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id);
 359         if (IS_ERR(call)) {
 360                 release_sock(&rx->sk);
 361                 up(limiter);
 362                 _leave(" = %ld", PTR_ERR(call));
 363                 return call;
 364         }
 365
 366         /* We need to protect a partially set up call against the user as we
 367          * will be acting outside the socket lock.
 368          */
 369         mutex_lock(&call->user_mutex);
 370
 371         /* Publish the call, even though it is incompletely set up as yet */
 372         write_lock(&rx->call_lock);
 373
 374         pp = &rx->calls.rb_node;
 375         parent = NULL;
 376         while (*pp) {
 377                 parent = *pp;
 378                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 379
 380                 if (p->user_call_ID < xcall->user_call_ID)
 381                         pp = &(*pp)->rb_left;
 382                 else if (p->user_call_ID > xcall->user_call_ID)
 383                         pp = &(*pp)->rb_right;
 384                 else
 385                         goto error_dup_user_ID;
 386         }
 387
 388         rcu_assign_pointer(call->socket, rx);
 389         call->user_call_ID = p->user_call_ID;
 390         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 391         rxrpc_get_call(call, rxrpc_call_get_userid);
 392         rb_link_node(&call->sock_node, parent, pp);
 393         rb_insert_color(&call->sock_node, &rx->calls);
 394         list_add(&call->sock_link, &rx->sock_calls);
 395
 396         write_unlock(&rx->call_lock);
 397
 398         rxnet = call->rxnet;
 399         spin_lock(&rxnet->call_lock);
 400         list_add_tail_rcu(&call->link, &rxnet->calls);
 401         spin_unlock(&rxnet->call_lock);
 402
 403         /* From this point on, the call is protected by its own lock. */
 404         release_sock(&rx->sk);
 405
 406         /* Set up or get a connection record and set the protocol parameters,
 407          * including channel number and call ID.
 408          */
 409         ret = rxrpc_connect_call(call, gfp);
 410         if (ret < 0)
 411                 goto error_attached_to_socket;
 412
 413         _leave(" = %p [new]", call);
 414         return call;
 415
 416         /* We unexpectedly found the user ID in the list after taking
 417          * the call_lock.  This shouldn't happen unless the user races
 418          * with itself and tries to add the same user ID twice at the
 419          * same time in different threads.
 420          */
 421 error_dup_user_ID:
 422         write_unlock(&rx->call_lock);
 423         release_sock(&rx->sk);
 424         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 425         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 426                          rxrpc_call_see_userid_exists);
 427         mutex_unlock(&call->user_mutex);
 428         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 429         _leave(" = -EEXIST");
 430         return ERR_PTR(-EEXIST);
 431
 432         /* We got an error, but the call is attached to the socket and is in
 433          * need of release.  However, we might now race with recvmsg() when it
 434          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 435          * leave the error to recvmsg() to deal with.
 436          */
 437 error_attached_to_socket:
 438         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 439                          rxrpc_call_see_connect_failed);
 440         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 441         _leave(" = c=%08x [err]", call->debug_id);
 442         return call;
 443 }
 444
 445 /*
 446  * Set up an incoming call.  call->conn points to the connection.
 447  * This is called in BH context and isn't allowed to fail.
 448  */
 449 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 450                          struct rxrpc_call *call,
 451                          struct sk_buff *skb)
 452 {
 453         struct rxrpc_connection *conn = call->conn;
 454         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 455         u32 chan;
 456
 457         _enter(",%d", call->conn->debug_id);
 458
 459         rcu_assign_pointer(call->socket, rx);
 460         call->call_id           = sp->hdr.callNumber;
 461         call->dest_srx.srx_service = sp->hdr.serviceId;
 462         call->cid               = sp->hdr.cid;
 463         call->cong_tstamp       = skb->tstamp;
 464
 465         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 466         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 467
 468         spin_lock(&conn->state_lock);
 469
 470         switch (conn->state) {
 471         case RXRPC_CONN_SERVICE_UNSECURED:
 472         case RXRPC_CONN_SERVICE_CHALLENGING:
 473                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 474                 break;
 475         case RXRPC_CONN_SERVICE:
 476                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 477                 break;
 478
 479         case RXRPC_CONN_ABORTED:
 480                 rxrpc_set_call_completion(call, conn->completion,
 481                                           conn->abort_code, conn->error);
 482                 break;
 483         default:
 484                 BUG();
 485         }
 486
 487         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 488
 489         /* Set the channel for this call.  We don't get channel_lock as we're
 490          * only defending against the data_ready handler (which we're called
 491          * from) and the RESPONSE packet parser (which is only really
 492          * interested in call_counter and can cope with a disagreement with the
 493          * call pointer).
 494          */
 495         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 496         conn->channels[chan].call_counter = call->call_id;
 497         conn->channels[chan].call_id = call->call_id;
 498         conn->channels[chan].call = call;
 499         spin_unlock(&conn->state_lock);
 500
 501         spin_lock(&conn->peer->lock);
 502         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 503         spin_unlock(&conn->peer->lock);
 504
 505         rxrpc_start_call_timer(call);
 506         _leave("");
 507 }
 508
 509 /*
 510  * Note the re-emergence of a call.
 511  */
 512 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 513 {
 514         if (call) {
 515                 int r = refcount_read(&call->ref);
 516
 517                 trace_rxrpc_call(call->debug_id, r, 0, why);
 518         }
 519 }
 520
 521 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 522                                       enum rxrpc_call_trace why)
 523 {
 524         int r;
 525
 526         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 527                 return NULL;
 528         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 529         return call;
 530 }
 531
 532 /*
 533  * Note the addition of a ref on a call.
 534  */
 535 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 536 {
 537         int r;
 538
 539         __refcount_inc(&call->ref, &r);
 540         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 541 }
 542
 543 /*
 544  * Clean up the Rx skb ring.
 545  */
 546 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 547 {
 548         rxrpc_purge_queue(&call->recvmsg_queue);
 549         rxrpc_purge_queue(&call->rx_oos_queue);
 550 }
 551
 552 /*
 553  * Detach a call from its owning socket.
 554  */
 555 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 556 {
 557         struct rxrpc_connection *conn = call->conn;
 558         bool put = false, putu = false;
 559
 560         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 561
 562         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 563                          call->flags, rxrpc_call_see_release);
 564
 565         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 566                 BUG();
 567
 568         rxrpc_put_call_slot(call);
 569
 570         /* Make sure we don't get any more notifications */
 571         spin_lock(&rx->recvmsg_lock);
 572
 573         if (!list_empty(&call->recvmsg_link)) {
 574                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 575                        call, call->events, call->flags);
 576                 list_del(&call->recvmsg_link);
 577                 put = true;
 578         }
 579
 580         /* list_empty() must return false in rxrpc_notify_socket() */
 581         call->recvmsg_link.next = NULL;
 582         call->recvmsg_link.prev = NULL;
 583
 584         spin_unlock(&rx->recvmsg_lock);
 585         if (put)
 586                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 587
 588         write_lock(&rx->call_lock);
 589
 590         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 591                 rb_erase(&call->sock_node, &rx->calls);
 592                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 593                 putu = true;
 594         }
 595
 596         list_del(&call->sock_link);
 597         write_unlock(&rx->call_lock);
 598
 599         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 600
 601         if (putu)
 602                 rxrpc_put_call(call, rxrpc_call_put_userid);
 603
 604         _leave("");
 605 }
 606
 607 /*
 608  * release all the calls associated with a socket
 609  */
 610 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 611 {
 612         struct rxrpc_call *call;
 613
 614         _enter("%p", rx);
 615
 616         while (!list_empty(&rx->to_be_accepted)) {
 617                 call = list_entry(rx->to_be_accepted.next,
 618                                   struct rxrpc_call, accept_link);
 619                 list_del(&call->accept_link);
 620                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 621                                     rxrpc_abort_call_sock_release_tba);
 622                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 623         }
 624
 625         while (!list_empty(&rx->sock_calls)) {
 626                 call = list_entry(rx->sock_calls.next,
 627                                   struct rxrpc_call, sock_link);
 628                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 629                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 630                                     rxrpc_abort_call_sock_release);
 631                 rxrpc_release_call(rx, call);
 632                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 633         }
 634
 635         _leave("");
 636 }
 637
 638 /*
 639  * release a call
 640  */
 641 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 642 {
 643         struct rxrpc_net *rxnet = call->rxnet;
 644         unsigned int debug_id = call->debug_id;
 645         bool dead;
 646         int r;
 647
 648         ASSERT(call != NULL);
 649
 650         dead = __refcount_dec_and_test(&call->ref, &r);
 651         trace_rxrpc_call(debug_id, r - 1, 0, why);
 652         if (dead) {
 653                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 654
 655                 if (!list_empty(&call->link)) {
 656                         spin_lock(&rxnet->call_lock);
 657                         list_del_init(&call->link);
 658                         spin_unlock(&rxnet->call_lock);
 659                 }
 660
 661                 rxrpc_cleanup_call(call);
 662         }
 663 }
 664
 665 /*
 666  * Free up the call under RCU.
 667  */
 668 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 669 {
 670         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 671         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 672
 673         kmem_cache_free(rxrpc_call_jar, call);
 674         if (atomic_dec_and_test(&rxnet->nr_calls))
 675                 wake_up_var(&rxnet->nr_calls);
 676 }
 677
 678 /*
 679  * Final call destruction - but must be done in process context.
 680  */
 681 static void rxrpc_destroy_call(struct work_struct *work)
 682 {
 683         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 684         struct rxrpc_txbuf *txb;
 685
 686         del_timer_sync(&call->timer);
 687
 688         rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
 689         rxrpc_cleanup_ring(call);
 690         while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
 691                                                struct rxrpc_txbuf, call_link))) {
 692                 list_del(&txb->call_link);
 693                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 694         }
 695         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 696                                                struct rxrpc_txbuf, call_link))) {
 697                 list_del(&txb->call_link);
 698                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 699         }
 700
 701         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 702         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 703         rxrpc_deactivate_bundle(call->bundle);
 704         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 705         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 706         rxrpc_put_local(call->local, rxrpc_local_put_call);
 707         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 708 }
 709
 710 /*
 711  * clean up a call
 712  */
 713 void rxrpc_cleanup_call(struct rxrpc_call *call)
 714 {
 715         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 716
 717         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 718         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 719
 720         del_timer(&call->timer);
 721
 722         if (rcu_read_lock_held())
 723                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 724                  * something that may be running/waiting there.
 725                  */
 726                 schedule_work(&call->destroyer);
 727         else
 728                 rxrpc_destroy_call(&call->destroyer);
 729 }
 730
 731 /*
 732  * Make sure that all calls are gone from a network namespace.  To reach this
 733  * point, any open UDP sockets in that namespace must have been closed, so any
 734  * outstanding calls cannot be doing I/O.
 735  */
 736 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 737 {
 738         struct rxrpc_call *call;
 739
 740         _enter("");
 741
 742         if (!list_empty(&rxnet->calls)) {
 743                 spin_lock(&rxnet->call_lock);
 744
 745                 while (!list_empty(&rxnet->calls)) {
 746                         call = list_entry(rxnet->calls.next,
 747                                           struct rxrpc_call, link);
 748                         _debug("Zapping call %p", call);
 749
 750                         rxrpc_see_call(call, rxrpc_call_see_zap);
 751                         list_del_init(&call->link);
 752
 753                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 754                                call, refcount_read(&call->ref),
 755                                rxrpc_call_states[__rxrpc_call_state(call)],
 756                                call->flags, call->events);
 757
 758                         spin_unlock(&rxnet->call_lock);
 759                         cond_resched();
 760                         spin_lock(&rxnet->call_lock);
 761                 }
 762
 763                 spin_unlock(&rxnet->call_lock);
 764         }
 765
 766         atomic_dec(&rxnet->nr_calls);
 767         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 768 }