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         if (p->timeouts.normal)
 230                 call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL);
 231         if (p->timeouts.idle)
 232                 call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL);
 233         if (p->timeouts.hard)
 234                 call->hard_timo = p->timeouts.hard * HZ;
 235
 236         ret = rxrpc_init_client_call_security(call);
 237         if (ret < 0) {
 238                 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
 239                 rxrpc_put_call(call, rxrpc_call_put_discard_error);
 240                 return ERR_PTR(ret);
 241         }
 242
 243         rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
 244
 245         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 246                          p->user_call_ID, rxrpc_call_new_client);
 247
 248         _leave(" = %p", call);
 249         return call;
 250 }
 251
 252 /*
 253  * Initiate the call ack/resend/expiry timer.
 254  */
 255 void rxrpc_start_call_timer(struct rxrpc_call *call)
 256 {
 257         unsigned long now = jiffies;
 258         unsigned long j = now + MAX_JIFFY_OFFSET;
 259
 260         call->delay_ack_at = j;
 261         call->ack_lost_at = j;
 262         call->resend_at = j;
 263         call->ping_at = j;
 264         call->keepalive_at = j;
 265         call->expect_rx_by = j;
 266         call->expect_req_by = j;
 267         call->expect_term_by = j + call->hard_timo;
 268         call->timer.expires = now;
 269 }
 270
 271 /*
 272  * Wait for a call slot to become available.
 273  */
 274 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
 275 {
 276         struct semaphore *limiter = &rxrpc_call_limiter;
 277
 278         if (p->kernel)
 279                 limiter = &rxrpc_kernel_call_limiter;
 280         if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
 281                 down(limiter);
 282                 return limiter;
 283         }
 284         return down_interruptible(limiter) < 0 ? NULL : limiter;
 285 }
 286
 287 /*
 288  * Release a call slot.
 289  */
 290 static void rxrpc_put_call_slot(struct rxrpc_call *call)
 291 {
 292         struct semaphore *limiter = &rxrpc_call_limiter;
 293
 294         if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
 295                 limiter = &rxrpc_kernel_call_limiter;
 296         up(limiter);
 297 }
 298
 299 /*
 300  * Start the process of connecting a call.  We obtain a peer and a connection
 301  * bundle, but the actual association of a call with a connection is offloaded
 302  * to the I/O thread to simplify locking.
 303  */
 304 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
 305 {
 306         struct rxrpc_local *local = call->local;
 307         int ret = -ENOMEM;
 308
 309         _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 310
 311         call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp);
 312         if (!call->peer)
 313                 goto error;
 314
 315         ret = rxrpc_look_up_bundle(call, gfp);
 316         if (ret < 0)
 317                 goto error;
 318
 319         trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
 320         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 321         spin_lock(&local->client_call_lock);
 322         list_add_tail(&call->wait_link, &local->new_client_calls);
 323         spin_unlock(&local->client_call_lock);
 324         rxrpc_wake_up_io_thread(local);
 325         return 0;
 326
 327 error:
 328         __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
 329         return ret;
 330 }
 331
 332 /*
 333  * Set up a call for the given parameters.
 334  * - Called with the socket lock held, which it must release.
 335  * - If it returns a call, the call's lock will need releasing by the caller.
 336  */
 337 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 338                                          struct rxrpc_conn_parameters *cp,
 339                                          struct sockaddr_rxrpc *srx,
 340                                          struct rxrpc_call_params *p,
 341                                          gfp_t gfp,
 342                                          unsigned int debug_id)
 343         __releases(&rx->sk.sk_lock.slock)
 344         __acquires(&call->user_mutex)
 345 {
 346         struct rxrpc_call *call, *xcall;
 347         struct rxrpc_net *rxnet;
 348         struct semaphore *limiter;
 349         struct rb_node *parent, **pp;
 350         int ret;
 351
 352         _enter("%p,%lx", rx, p->user_call_ID);
 353
 354         limiter = rxrpc_get_call_slot(p, gfp);
 355         if (!limiter) {
 356                 release_sock(&rx->sk);
 357                 return ERR_PTR(-ERESTARTSYS);
 358         }
 359
 360         call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id);
 361         if (IS_ERR(call)) {
 362                 release_sock(&rx->sk);
 363                 up(limiter);
 364                 _leave(" = %ld", PTR_ERR(call));
 365                 return call;
 366         }
 367
 368         /* We need to protect a partially set up call against the user as we
 369          * will be acting outside the socket lock.
 370          */
 371         mutex_lock(&call->user_mutex);
 372
 373         /* Publish the call, even though it is incompletely set up as yet */
 374         write_lock(&rx->call_lock);
 375
 376         pp = &rx->calls.rb_node;
 377         parent = NULL;
 378         while (*pp) {
 379                 parent = *pp;
 380                 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 381
 382                 if (p->user_call_ID < xcall->user_call_ID)
 383                         pp = &(*pp)->rb_left;
 384                 else if (p->user_call_ID > xcall->user_call_ID)
 385                         pp = &(*pp)->rb_right;
 386                 else
 387                         goto error_dup_user_ID;
 388         }
 389
 390         rcu_assign_pointer(call->socket, rx);
 391         call->user_call_ID = p->user_call_ID;
 392         __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 393         rxrpc_get_call(call, rxrpc_call_get_userid);
 394         rb_link_node(&call->sock_node, parent, pp);
 395         rb_insert_color(&call->sock_node, &rx->calls);
 396         list_add(&call->sock_link, &rx->sock_calls);
 397
 398         write_unlock(&rx->call_lock);
 399
 400         rxnet = call->rxnet;
 401         spin_lock(&rxnet->call_lock);
 402         list_add_tail_rcu(&call->link, &rxnet->calls);
 403         spin_unlock(&rxnet->call_lock);
 404
 405         /* From this point on, the call is protected by its own lock. */
 406         release_sock(&rx->sk);
 407
 408         /* Set up or get a connection record and set the protocol parameters,
 409          * including channel number and call ID.
 410          */
 411         ret = rxrpc_connect_call(call, gfp);
 412         if (ret < 0)
 413                 goto error_attached_to_socket;
 414
 415         _leave(" = %p [new]", call);
 416         return call;
 417
 418         /* We unexpectedly found the user ID in the list after taking
 419          * the call_lock.  This shouldn't happen unless the user races
 420          * with itself and tries to add the same user ID twice at the
 421          * same time in different threads.
 422          */
 423 error_dup_user_ID:
 424         write_unlock(&rx->call_lock);
 425         release_sock(&rx->sk);
 426         rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
 427         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
 428                          rxrpc_call_see_userid_exists);
 429         mutex_unlock(&call->user_mutex);
 430         rxrpc_put_call(call, rxrpc_call_put_userid_exists);
 431         _leave(" = -EEXIST");
 432         return ERR_PTR(-EEXIST);
 433
 434         /* We got an error, but the call is attached to the socket and is in
 435          * need of release.  However, we might now race with recvmsg() when it
 436          * completion notifies the socket.  Return 0 from sys_sendmsg() and
 437          * leave the error to recvmsg() to deal with.
 438          */
 439 error_attached_to_socket:
 440         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
 441                          rxrpc_call_see_connect_failed);
 442         rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
 443         _leave(" = c=%08x [err]", call->debug_id);
 444         return call;
 445 }
 446
 447 /*
 448  * Set up an incoming call.  call->conn points to the connection.
 449  * This is called in BH context and isn't allowed to fail.
 450  */
 451 void rxrpc_incoming_call(struct rxrpc_sock *rx,
 452                          struct rxrpc_call *call,
 453                          struct sk_buff *skb)
 454 {
 455         struct rxrpc_connection *conn = call->conn;
 456         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 457         u32 chan;
 458
 459         _enter(",%d", call->conn->debug_id);
 460
 461         rcu_assign_pointer(call->socket, rx);
 462         call->call_id           = sp->hdr.callNumber;
 463         call->dest_srx.srx_service = sp->hdr.serviceId;
 464         call->cid               = sp->hdr.cid;
 465         call->cong_tstamp       = skb->tstamp;
 466
 467         __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
 468         rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 469
 470         spin_lock(&conn->state_lock);
 471
 472         switch (conn->state) {
 473         case RXRPC_CONN_SERVICE_UNSECURED:
 474         case RXRPC_CONN_SERVICE_CHALLENGING:
 475                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
 476                 break;
 477         case RXRPC_CONN_SERVICE:
 478                 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
 479                 break;
 480
 481         case RXRPC_CONN_ABORTED:
 482                 rxrpc_set_call_completion(call, conn->completion,
 483                                           conn->abort_code, conn->error);
 484                 break;
 485         default:
 486                 BUG();
 487         }
 488
 489         rxrpc_get_call(call, rxrpc_call_get_io_thread);
 490
 491         /* Set the channel for this call.  We don't get channel_lock as we're
 492          * only defending against the data_ready handler (which we're called
 493          * from) and the RESPONSE packet parser (which is only really
 494          * interested in call_counter and can cope with a disagreement with the
 495          * call pointer).
 496          */
 497         chan = sp->hdr.cid & RXRPC_CHANNELMASK;
 498         conn->channels[chan].call_counter = call->call_id;
 499         conn->channels[chan].call_id = call->call_id;
 500         conn->channels[chan].call = call;
 501         spin_unlock(&conn->state_lock);
 502
 503         spin_lock(&conn->peer->lock);
 504         hlist_add_head(&call->error_link, &conn->peer->error_targets);
 505         spin_unlock(&conn->peer->lock);
 506
 507         rxrpc_start_call_timer(call);
 508         _leave("");
 509 }
 510
 511 /*
 512  * Note the re-emergence of a call.
 513  */
 514 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 515 {
 516         if (call) {
 517                 int r = refcount_read(&call->ref);
 518
 519                 trace_rxrpc_call(call->debug_id, r, 0, why);
 520         }
 521 }
 522
 523 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
 524                                       enum rxrpc_call_trace why)
 525 {
 526         int r;
 527
 528         if (!call || !__refcount_inc_not_zero(&call->ref, &r))
 529                 return NULL;
 530         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 531         return call;
 532 }
 533
 534 /*
 535  * Note the addition of a ref on a call.
 536  */
 537 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 538 {
 539         int r;
 540
 541         __refcount_inc(&call->ref, &r);
 542         trace_rxrpc_call(call->debug_id, r + 1, 0, why);
 543 }
 544
 545 /*
 546  * Clean up the Rx skb ring.
 547  */
 548 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
 549 {
 550         skb_queue_purge(&call->recvmsg_queue);
 551         skb_queue_purge(&call->rx_oos_queue);
 552 }
 553
 554 /*
 555  * Detach a call from its owning socket.
 556  */
 557 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 558 {
 559         struct rxrpc_connection *conn = call->conn;
 560         bool put = false, putu = false;
 561
 562         _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
 563
 564         trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 565                          call->flags, rxrpc_call_see_release);
 566
 567         if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 568                 BUG();
 569
 570         rxrpc_put_call_slot(call);
 571
 572         /* Make sure we don't get any more notifications */
 573         spin_lock(&rx->recvmsg_lock);
 574
 575         if (!list_empty(&call->recvmsg_link)) {
 576                 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
 577                        call, call->events, call->flags);
 578                 list_del(&call->recvmsg_link);
 579                 put = true;
 580         }
 581
 582         /* list_empty() must return false in rxrpc_notify_socket() */
 583         call->recvmsg_link.next = NULL;
 584         call->recvmsg_link.prev = NULL;
 585
 586         spin_unlock(&rx->recvmsg_lock);
 587         if (put)
 588                 rxrpc_put_call(call, rxrpc_call_put_unnotify);
 589
 590         write_lock(&rx->call_lock);
 591
 592         if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
 593                 rb_erase(&call->sock_node, &rx->calls);
 594                 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
 595                 putu = true;
 596         }
 597
 598         list_del(&call->sock_link);
 599         write_unlock(&rx->call_lock);
 600
 601         _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 602
 603         if (putu)
 604                 rxrpc_put_call(call, rxrpc_call_put_userid);
 605
 606         _leave("");
 607 }
 608
 609 /*
 610  * release all the calls associated with a socket
 611  */
 612 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 613 {
 614         struct rxrpc_call *call;
 615
 616         _enter("%p", rx);
 617
 618         while (!list_empty(&rx->to_be_accepted)) {
 619                 call = list_entry(rx->to_be_accepted.next,
 620                                   struct rxrpc_call, accept_link);
 621                 list_del(&call->accept_link);
 622                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 623                                     rxrpc_abort_call_sock_release_tba);
 624                 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
 625         }
 626
 627         while (!list_empty(&rx->sock_calls)) {
 628                 call = list_entry(rx->sock_calls.next,
 629                                   struct rxrpc_call, sock_link);
 630                 rxrpc_get_call(call, rxrpc_call_get_release_sock);
 631                 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
 632                                     rxrpc_abort_call_sock_release);
 633                 rxrpc_release_call(rx, call);
 634                 rxrpc_put_call(call, rxrpc_call_put_release_sock);
 635         }
 636
 637         _leave("");
 638 }
 639
 640 /*
 641  * release a call
 642  */
 643 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
 644 {
 645         struct rxrpc_net *rxnet = call->rxnet;
 646         unsigned int debug_id = call->debug_id;
 647         bool dead;
 648         int r;
 649
 650         ASSERT(call != NULL);
 651
 652         dead = __refcount_dec_and_test(&call->ref, &r);
 653         trace_rxrpc_call(debug_id, r - 1, 0, why);
 654         if (dead) {
 655                 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 656
 657                 if (!list_empty(&call->link)) {
 658                         spin_lock(&rxnet->call_lock);
 659                         list_del_init(&call->link);
 660                         spin_unlock(&rxnet->call_lock);
 661                 }
 662
 663                 rxrpc_cleanup_call(call);
 664         }
 665 }
 666
 667 /*
 668  * Free up the call under RCU.
 669  */
 670 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
 671 {
 672         struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
 673         struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
 674
 675         kmem_cache_free(rxrpc_call_jar, call);
 676         if (atomic_dec_and_test(&rxnet->nr_calls))
 677                 wake_up_var(&rxnet->nr_calls);
 678 }
 679
 680 /*
 681  * Final call destruction - but must be done in process context.
 682  */
 683 static void rxrpc_destroy_call(struct work_struct *work)
 684 {
 685         struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
 686         struct rxrpc_txbuf *txb;
 687
 688         del_timer_sync(&call->timer);
 689
 690         rxrpc_cleanup_ring(call);
 691         while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
 692                                                struct rxrpc_txbuf, call_link))) {
 693                 list_del(&txb->call_link);
 694                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 695         }
 696         while ((txb = list_first_entry_or_null(&call->tx_buffer,
 697                                                struct rxrpc_txbuf, call_link))) {
 698                 list_del(&txb->call_link);
 699                 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
 700         }
 701
 702         rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
 703         rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
 704         rxrpc_deactivate_bundle(call->bundle);
 705         rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 706         rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 707         rxrpc_put_local(call->local, rxrpc_local_put_call);
 708         call_rcu(&call->rcu, rxrpc_rcu_free_call);
 709 }
 710
 711 /*
 712  * clean up a call
 713  */
 714 void rxrpc_cleanup_call(struct rxrpc_call *call)
 715 {
 716         memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
 717
 718         ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
 719         ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
 720
 721         del_timer(&call->timer);
 722
 723         if (rcu_read_lock_held())
 724                 /* Can't use the rxrpc workqueue as we need to cancel/flush
 725                  * something that may be running/waiting there.
 726                  */
 727                 schedule_work(&call->destroyer);
 728         else
 729                 rxrpc_destroy_call(&call->destroyer);
 730 }
 731
 732 /*
 733  * Make sure that all calls are gone from a network namespace.  To reach this
 734  * point, any open UDP sockets in that namespace must have been closed, so any
 735  * outstanding calls cannot be doing I/O.
 736  */
 737 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
 738 {
 739         struct rxrpc_call *call;
 740
 741         _enter("");
 742
 743         if (!list_empty(&rxnet->calls)) {
 744                 spin_lock(&rxnet->call_lock);
 745
 746                 while (!list_empty(&rxnet->calls)) {
 747                         call = list_entry(rxnet->calls.next,
 748                                           struct rxrpc_call, link);
 749                         _debug("Zapping call %p", call);
 750
 751                         rxrpc_see_call(call, rxrpc_call_see_zap);
 752                         list_del_init(&call->link);
 753
 754                         pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
 755                                call, refcount_read(&call->ref),
 756                                rxrpc_call_states[__rxrpc_call_state(call)],
 757                                call->flags, call->events);
 758
 759                         spin_unlock(&rxnet->call_lock);
 760                         cond_resched();
 761                         spin_lock(&rxnet->call_lock);
 762                 }
 763
 764                 spin_unlock(&rxnet->call_lock);
 765         }
 766
 767         atomic_dec(&rxnet->nr_calls);
 768         wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
 769 }