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 (call->state < RXRPC_CALL_COMPLETE) { 54 spin_lock_bh(&local->lock); 55 busy = !list_empty(&call->attend_link); 56 trace_rxrpc_poke_call(call, busy, what); 57 if (!busy) { 58 rxrpc_get_call(call, rxrpc_call_get_poke); 59 list_add_tail(&call->attend_link, &local->call_attend_q); 60 } 61 spin_unlock_bh(&local->lock); 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 (call->state < RXRPC_CALL_COMPLETE) { 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->chan_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 rwlock_init(&call->state_lock); 166 refcount_set(&call->ref, 1); 167 call->debug_id = debug_id; 168 call->tx_total_len = -1; 169 call->next_rx_timo = 20 * HZ; 170 call->next_req_timo = 1 * HZ; 171 atomic64_set(&call->ackr_window, 0x100000001ULL); 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->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 215 call->dest_srx = *srx; 216 call->interruptibility = p->interruptibility; 217 call->tx_total_len = p->tx_total_len; 218 call->key = key_get(cp->key); 219 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); 220 call->security_level = cp->security_level; 221 if (p->kernel) 222 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 223 if (cp->upgrade) 224 __set_bit(RXRPC_CALL_UPGRADE, &call->flags); 225 if (cp->exclusive) 226 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); 227 228 ret = rxrpc_init_client_call_security(call); 229 if (ret < 0) { 230 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); 231 rxrpc_put_call(call, rxrpc_call_put_discard_error); 232 return ERR_PTR(ret); 233 } 234 235 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 236 p->user_call_ID, rxrpc_call_new_client); 237 238 _leave(" = %p", call); 239 return call; 240 } 241 242 /* 243 * Initiate the call ack/resend/expiry timer. 244 */ 245 static void rxrpc_start_call_timer(struct rxrpc_call *call) 246 { 247 unsigned long now = jiffies; 248 unsigned long j = now + MAX_JIFFY_OFFSET; 249 250 call->delay_ack_at = j; 251 call->ack_lost_at = j; 252 call->resend_at = j; 253 call->ping_at = j; 254 call->keepalive_at = j; 255 call->expect_rx_by = j; 256 call->expect_req_by = j; 257 call->expect_term_by = j; 258 call->timer.expires = now; 259 } 260 261 /* 262 * Wait for a call slot to become available. 263 */ 264 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 265 { 266 struct semaphore *limiter = &rxrpc_call_limiter; 267 268 if (p->kernel) 269 limiter = &rxrpc_kernel_call_limiter; 270 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 271 down(limiter); 272 return limiter; 273 } 274 return down_interruptible(limiter) < 0 ? NULL : limiter; 275 } 276 277 /* 278 * Release a call slot. 279 */ 280 static void rxrpc_put_call_slot(struct rxrpc_call *call) 281 { 282 struct semaphore *limiter = &rxrpc_call_limiter; 283 284 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 285 limiter = &rxrpc_kernel_call_limiter; 286 up(limiter); 287 } 288 289 /* 290 * Set up a call for the given parameters. 291 * - Called with the socket lock held, which it must release. 292 * - If it returns a call, the call's lock will need releasing by the caller. 293 */ 294 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 295 struct rxrpc_conn_parameters *cp, 296 struct sockaddr_rxrpc *srx, 297 struct rxrpc_call_params *p, 298 gfp_t gfp, 299 unsigned int debug_id) 300 __releases(&rx->sk.sk_lock.slock) 301 __acquires(&call->user_mutex) 302 { 303 struct rxrpc_call *call, *xcall; 304 struct rxrpc_net *rxnet; 305 struct semaphore *limiter; 306 struct rb_node *parent, **pp; 307 int ret; 308 309 _enter("%p,%lx", rx, p->user_call_ID); 310 311 limiter = rxrpc_get_call_slot(p, gfp); 312 if (!limiter) { 313 release_sock(&rx->sk); 314 return ERR_PTR(-ERESTARTSYS); 315 } 316 317 call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id); 318 if (IS_ERR(call)) { 319 release_sock(&rx->sk); 320 up(limiter); 321 _leave(" = %ld", PTR_ERR(call)); 322 return call; 323 } 324 325 /* We need to protect a partially set up call against the user as we 326 * will be acting outside the socket lock. 327 */ 328 mutex_lock(&call->user_mutex); 329 330 /* Publish the call, even though it is incompletely set up as yet */ 331 write_lock(&rx->call_lock); 332 333 pp = &rx->calls.rb_node; 334 parent = NULL; 335 while (*pp) { 336 parent = *pp; 337 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 338 339 if (p->user_call_ID < xcall->user_call_ID) 340 pp = &(*pp)->rb_left; 341 else if (p->user_call_ID > xcall->user_call_ID) 342 pp = &(*pp)->rb_right; 343 else 344 goto error_dup_user_ID; 345 } 346 347 rcu_assign_pointer(call->socket, rx); 348 call->user_call_ID = p->user_call_ID; 349 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 350 rxrpc_get_call(call, rxrpc_call_get_userid); 351 rb_link_node(&call->sock_node, parent, pp); 352 rb_insert_color(&call->sock_node, &rx->calls); 353 list_add(&call->sock_link, &rx->sock_calls); 354 355 write_unlock(&rx->call_lock); 356 357 rxnet = call->rxnet; 358 spin_lock(&rxnet->call_lock); 359 list_add_tail_rcu(&call->link, &rxnet->calls); 360 spin_unlock(&rxnet->call_lock); 361 362 /* From this point on, the call is protected by its own lock. */ 363 release_sock(&rx->sk); 364 365 /* Set up or get a connection record and set the protocol parameters, 366 * including channel number and call ID. 367 */ 368 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 369 if (ret < 0) 370 goto error_attached_to_socket; 371 372 rxrpc_see_call(call, rxrpc_call_see_connected); 373 374 rxrpc_start_call_timer(call); 375 376 _leave(" = %p [new]", call); 377 return call; 378 379 /* We unexpectedly found the user ID in the list after taking 380 * the call_lock. This shouldn't happen unless the user races 381 * with itself and tries to add the same user ID twice at the 382 * same time in different threads. 383 */ 384 error_dup_user_ID: 385 write_unlock(&rx->call_lock); 386 release_sock(&rx->sk); 387 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 388 RX_CALL_DEAD, -EEXIST); 389 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, 390 rxrpc_call_see_userid_exists); 391 rxrpc_release_call(rx, call); 392 mutex_unlock(&call->user_mutex); 393 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 394 _leave(" = -EEXIST"); 395 return ERR_PTR(-EEXIST); 396 397 /* We got an error, but the call is attached to the socket and is in 398 * need of release. However, we might now race with recvmsg() when 399 * completing the call queues it. Return 0 from sys_sendmsg() and 400 * leave the error to recvmsg() to deal with. 401 */ 402 error_attached_to_socket: 403 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, 404 rxrpc_call_see_connect_failed); 405 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 406 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 407 RX_CALL_DEAD, ret); 408 _leave(" = c=%08x [err]", call->debug_id); 409 return call; 410 } 411 412 /* 413 * Set up an incoming call. call->conn points to the connection. 414 * This is called in BH context and isn't allowed to fail. 415 */ 416 void rxrpc_incoming_call(struct rxrpc_sock *rx, 417 struct rxrpc_call *call, 418 struct sk_buff *skb) 419 { 420 struct rxrpc_connection *conn = call->conn; 421 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 422 u32 chan; 423 424 _enter(",%d", call->conn->debug_id); 425 426 rcu_assign_pointer(call->socket, rx); 427 call->call_id = sp->hdr.callNumber; 428 call->dest_srx.srx_service = sp->hdr.serviceId; 429 call->cid = sp->hdr.cid; 430 call->state = RXRPC_CALL_SERVER_SECURING; 431 call->cong_tstamp = skb->tstamp; 432 433 spin_lock(&conn->state_lock); 434 435 switch (conn->state) { 436 case RXRPC_CONN_SERVICE_UNSECURED: 437 case RXRPC_CONN_SERVICE_CHALLENGING: 438 call->state = RXRPC_CALL_SERVER_SECURING; 439 break; 440 case RXRPC_CONN_SERVICE: 441 call->state = RXRPC_CALL_SERVER_RECV_REQUEST; 442 break; 443 444 case RXRPC_CONN_REMOTELY_ABORTED: 445 __rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, 446 conn->abort_code, conn->error); 447 break; 448 case RXRPC_CONN_LOCALLY_ABORTED: 449 __rxrpc_abort_call("CON", call, 1, 450 conn->abort_code, conn->error); 451 break; 452 default: 453 BUG(); 454 } 455 456 /* Set the channel for this call. We don't get channel_lock as we're 457 * only defending against the data_ready handler (which we're called 458 * from) and the RESPONSE packet parser (which is only really 459 * interested in call_counter and can cope with a disagreement with the 460 * call pointer). 461 */ 462 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 463 conn->channels[chan].call_counter = call->call_id; 464 conn->channels[chan].call_id = call->call_id; 465 rcu_assign_pointer(conn->channels[chan].call, call); 466 spin_unlock(&conn->state_lock); 467 468 spin_lock(&conn->peer->lock); 469 hlist_add_head(&call->error_link, &conn->peer->error_targets); 470 spin_unlock(&conn->peer->lock); 471 472 rxrpc_start_call_timer(call); 473 _leave(""); 474 } 475 476 /* 477 * Note the re-emergence of a call. 478 */ 479 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 480 { 481 if (call) { 482 int r = refcount_read(&call->ref); 483 484 trace_rxrpc_call(call->debug_id, r, 0, why); 485 } 486 } 487 488 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, 489 enum rxrpc_call_trace why) 490 { 491 int r; 492 493 if (!call || !__refcount_inc_not_zero(&call->ref, &r)) 494 return NULL; 495 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 496 return call; 497 } 498 499 /* 500 * Note the addition of a ref on a call. 501 */ 502 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 503 { 504 int r; 505 506 __refcount_inc(&call->ref, &r); 507 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 508 } 509 510 /* 511 * Clean up the Rx skb ring. 512 */ 513 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 514 { 515 skb_queue_purge(&call->recvmsg_queue); 516 skb_queue_purge(&call->rx_oos_queue); 517 } 518 519 /* 520 * Detach a call from its owning socket. 521 */ 522 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 523 { 524 struct rxrpc_connection *conn = call->conn; 525 bool put = false; 526 527 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 528 529 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 530 call->flags, rxrpc_call_see_release); 531 532 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 533 534 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 535 BUG(); 536 537 rxrpc_put_call_slot(call); 538 del_timer_sync(&call->timer); 539 540 /* Make sure we don't get any more notifications */ 541 write_lock(&rx->recvmsg_lock); 542 543 if (!list_empty(&call->recvmsg_link)) { 544 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 545 call, call->events, call->flags); 546 list_del(&call->recvmsg_link); 547 put = true; 548 } 549 550 /* list_empty() must return false in rxrpc_notify_socket() */ 551 call->recvmsg_link.next = NULL; 552 call->recvmsg_link.prev = NULL; 553 554 write_unlock(&rx->recvmsg_lock); 555 if (put) 556 rxrpc_put_call(call, rxrpc_call_put_unnotify); 557 558 write_lock(&rx->call_lock); 559 560 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 561 rb_erase(&call->sock_node, &rx->calls); 562 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 563 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 564 } 565 566 list_del(&call->sock_link); 567 write_unlock(&rx->call_lock); 568 569 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 570 571 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 572 rxrpc_disconnect_call(call); 573 if (call->security) 574 call->security->free_call_crypto(call); 575 _leave(""); 576 } 577 578 /* 579 * release all the calls associated with a socket 580 */ 581 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 582 { 583 struct rxrpc_call *call; 584 585 _enter("%p", rx); 586 587 while (!list_empty(&rx->to_be_accepted)) { 588 call = list_entry(rx->to_be_accepted.next, 589 struct rxrpc_call, accept_link); 590 list_del(&call->accept_link); 591 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 592 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); 593 } 594 595 while (!list_empty(&rx->sock_calls)) { 596 call = list_entry(rx->sock_calls.next, 597 struct rxrpc_call, sock_link); 598 rxrpc_get_call(call, rxrpc_call_get_release_sock); 599 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 600 rxrpc_send_abort_packet(call); 601 rxrpc_release_call(rx, call); 602 rxrpc_put_call(call, rxrpc_call_put_release_sock); 603 } 604 605 _leave(""); 606 } 607 608 /* 609 * release a call 610 */ 611 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 612 { 613 struct rxrpc_net *rxnet = call->rxnet; 614 unsigned int debug_id = call->debug_id; 615 bool dead; 616 int r; 617 618 ASSERT(call != NULL); 619 620 dead = __refcount_dec_and_test(&call->ref, &r); 621 trace_rxrpc_call(debug_id, r - 1, 0, why); 622 if (dead) { 623 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 624 625 if (!list_empty(&call->link)) { 626 spin_lock(&rxnet->call_lock); 627 list_del_init(&call->link); 628 spin_unlock(&rxnet->call_lock); 629 } 630 631 rxrpc_cleanup_call(call); 632 } 633 } 634 635 /* 636 * Free up the call under RCU. 637 */ 638 static void rxrpc_rcu_free_call(struct rcu_head *rcu) 639 { 640 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 641 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); 642 643 kmem_cache_free(rxrpc_call_jar, call); 644 if (atomic_dec_and_test(&rxnet->nr_calls)) 645 wake_up_var(&rxnet->nr_calls); 646 } 647 648 /* 649 * Final call destruction - but must be done in process context. 650 */ 651 static void rxrpc_destroy_call(struct work_struct *work) 652 { 653 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); 654 struct rxrpc_txbuf *txb; 655 656 del_timer_sync(&call->timer); 657 658 rxrpc_cleanup_ring(call); 659 while ((txb = list_first_entry_or_null(&call->tx_sendmsg, 660 struct rxrpc_txbuf, call_link))) { 661 list_del(&txb->call_link); 662 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 663 } 664 while ((txb = list_first_entry_or_null(&call->tx_buffer, 665 struct rxrpc_txbuf, call_link))) { 666 list_del(&txb->call_link); 667 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 668 } 669 670 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 671 rxrpc_put_connection(call->conn, rxrpc_conn_put_call); 672 rxrpc_put_peer(call->peer, rxrpc_peer_put_call); 673 rxrpc_put_local(call->local, rxrpc_local_put_call); 674 call_rcu(&call->rcu, rxrpc_rcu_free_call); 675 } 676 677 /* 678 * clean up a call 679 */ 680 void rxrpc_cleanup_call(struct rxrpc_call *call) 681 { 682 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 683 684 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 685 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 686 687 del_timer(&call->timer); 688 689 if (rcu_read_lock_held()) 690 /* Can't use the rxrpc workqueue as we need to cancel/flush 691 * something that may be running/waiting there. 692 */ 693 schedule_work(&call->destroyer); 694 else 695 rxrpc_destroy_call(&call->destroyer); 696 } 697 698 /* 699 * Make sure that all calls are gone from a network namespace. To reach this 700 * point, any open UDP sockets in that namespace must have been closed, so any 701 * outstanding calls cannot be doing I/O. 702 */ 703 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 704 { 705 struct rxrpc_call *call; 706 707 _enter(""); 708 709 if (!list_empty(&rxnet->calls)) { 710 spin_lock(&rxnet->call_lock); 711 712 while (!list_empty(&rxnet->calls)) { 713 call = list_entry(rxnet->calls.next, 714 struct rxrpc_call, link); 715 _debug("Zapping call %p", call); 716 717 rxrpc_see_call(call, rxrpc_call_see_zap); 718 list_del_init(&call->link); 719 720 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 721 call, refcount_read(&call->ref), 722 rxrpc_call_states[call->state], 723 call->flags, call->events); 724 725 spin_unlock(&rxnet->call_lock); 726 cond_resched(); 727 spin_lock(&rxnet->call_lock); 728 } 729 730 spin_unlock(&rxnet->call_lock); 731 } 732 733 atomic_dec(&rxnet->nr_calls); 734 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 735 } 736