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 static void rxrpc_call_timer_expired(struct timer_list *t) 49 { 50 struct rxrpc_call *call = from_timer(call, t, timer); 51 52 _enter("%d", call->debug_id); 53 54 if (call->state < RXRPC_CALL_COMPLETE) { 55 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 56 rxrpc_queue_call(call); 57 } 58 } 59 60 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 61 62 /* 63 * find an extant server call 64 * - called in process context with IRQs enabled 65 */ 66 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 67 unsigned long user_call_ID) 68 { 69 struct rxrpc_call *call; 70 struct rb_node *p; 71 72 _enter("%p,%lx", rx, user_call_ID); 73 74 read_lock(&rx->call_lock); 75 76 p = rx->calls.rb_node; 77 while (p) { 78 call = rb_entry(p, struct rxrpc_call, sock_node); 79 80 if (user_call_ID < call->user_call_ID) 81 p = p->rb_left; 82 else if (user_call_ID > call->user_call_ID) 83 p = p->rb_right; 84 else 85 goto found_extant_call; 86 } 87 88 read_unlock(&rx->call_lock); 89 _leave(" = NULL"); 90 return NULL; 91 92 found_extant_call: 93 rxrpc_get_call(call, rxrpc_call_got); 94 read_unlock(&rx->call_lock); 95 _leave(" = %p [%d]", call, atomic_read(&call->usage)); 96 return call; 97 } 98 99 /* 100 * allocate a new call 101 */ 102 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 103 unsigned int debug_id) 104 { 105 struct rxrpc_call *call; 106 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 107 108 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 109 if (!call) 110 return NULL; 111 112 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 113 sizeof(struct sk_buff *), 114 gfp); 115 if (!call->rxtx_buffer) 116 goto nomem; 117 118 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 119 if (!call->rxtx_annotations) 120 goto nomem_2; 121 122 mutex_init(&call->user_mutex); 123 124 /* Prevent lockdep reporting a deadlock false positive between the afs 125 * filesystem and sys_sendmsg() via the mmap sem. 126 */ 127 if (rx->sk.sk_kern_sock) 128 lockdep_set_class(&call->user_mutex, 129 &rxrpc_call_user_mutex_lock_class_key); 130 131 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 132 INIT_WORK(&call->processor, &rxrpc_process_call); 133 INIT_LIST_HEAD(&call->link); 134 INIT_LIST_HEAD(&call->chan_wait_link); 135 INIT_LIST_HEAD(&call->accept_link); 136 INIT_LIST_HEAD(&call->recvmsg_link); 137 INIT_LIST_HEAD(&call->sock_link); 138 init_waitqueue_head(&call->waitq); 139 spin_lock_init(&call->lock); 140 spin_lock_init(&call->notify_lock); 141 spin_lock_init(&call->input_lock); 142 rwlock_init(&call->state_lock); 143 atomic_set(&call->usage, 1); 144 call->debug_id = debug_id; 145 call->tx_total_len = -1; 146 call->next_rx_timo = 20 * HZ; 147 call->next_req_timo = 1 * HZ; 148 149 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 150 151 /* Leave space in the ring to handle a maxed-out jumbo packet */ 152 call->rx_winsize = rxrpc_rx_window_size; 153 call->tx_winsize = 16; 154 call->rx_expect_next = 1; 155 156 call->cong_cwnd = 2; 157 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 158 159 call->rxnet = rxnet; 160 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 161 atomic_inc(&rxnet->nr_calls); 162 return call; 163 164 nomem_2: 165 kfree(call->rxtx_buffer); 166 nomem: 167 kmem_cache_free(rxrpc_call_jar, call); 168 return NULL; 169 } 170 171 /* 172 * Allocate a new client call. 173 */ 174 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 175 struct sockaddr_rxrpc *srx, 176 gfp_t gfp, 177 unsigned int debug_id) 178 { 179 struct rxrpc_call *call; 180 ktime_t now; 181 182 _enter(""); 183 184 call = rxrpc_alloc_call(rx, gfp, debug_id); 185 if (!call) 186 return ERR_PTR(-ENOMEM); 187 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 188 call->service_id = srx->srx_service; 189 call->tx_phase = true; 190 now = ktime_get_real(); 191 call->acks_latest_ts = now; 192 call->cong_tstamp = now; 193 194 _leave(" = %p", call); 195 return call; 196 } 197 198 /* 199 * Initiate the call ack/resend/expiry timer. 200 */ 201 static void rxrpc_start_call_timer(struct rxrpc_call *call) 202 { 203 unsigned long now = jiffies; 204 unsigned long j = now + MAX_JIFFY_OFFSET; 205 206 call->ack_at = j; 207 call->ack_lost_at = j; 208 call->resend_at = j; 209 call->ping_at = j; 210 call->expect_rx_by = j; 211 call->expect_req_by = j; 212 call->expect_term_by = j; 213 call->timer.expires = now; 214 } 215 216 /* 217 * Wait for a call slot to become available. 218 */ 219 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 220 { 221 struct semaphore *limiter = &rxrpc_call_limiter; 222 223 if (p->kernel) 224 limiter = &rxrpc_kernel_call_limiter; 225 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 226 down(limiter); 227 return limiter; 228 } 229 return down_interruptible(limiter) < 0 ? NULL : limiter; 230 } 231 232 /* 233 * Release a call slot. 234 */ 235 static void rxrpc_put_call_slot(struct rxrpc_call *call) 236 { 237 struct semaphore *limiter = &rxrpc_call_limiter; 238 239 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 240 limiter = &rxrpc_kernel_call_limiter; 241 up(limiter); 242 } 243 244 /* 245 * Set up a call for the given parameters. 246 * - Called with the socket lock held, which it must release. 247 * - If it returns a call, the call's lock will need releasing by the caller. 248 */ 249 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 250 struct rxrpc_conn_parameters *cp, 251 struct sockaddr_rxrpc *srx, 252 struct rxrpc_call_params *p, 253 gfp_t gfp, 254 unsigned int debug_id) 255 __releases(&rx->sk.sk_lock.slock) 256 __acquires(&call->user_mutex) 257 { 258 struct rxrpc_call *call, *xcall; 259 struct rxrpc_net *rxnet; 260 struct semaphore *limiter; 261 struct rb_node *parent, **pp; 262 const void *here = __builtin_return_address(0); 263 int ret; 264 265 _enter("%p,%lx", rx, p->user_call_ID); 266 267 limiter = rxrpc_get_call_slot(p, gfp); 268 if (!limiter) 269 return ERR_PTR(-ERESTARTSYS); 270 271 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 272 if (IS_ERR(call)) { 273 release_sock(&rx->sk); 274 up(limiter); 275 _leave(" = %ld", PTR_ERR(call)); 276 return call; 277 } 278 279 call->interruptibility = p->interruptibility; 280 call->tx_total_len = p->tx_total_len; 281 trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, 282 atomic_read(&call->usage), 283 here, (const void *)p->user_call_ID); 284 if (p->kernel) 285 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 286 287 /* We need to protect a partially set up call against the user as we 288 * will be acting outside the socket lock. 289 */ 290 mutex_lock(&call->user_mutex); 291 292 /* Publish the call, even though it is incompletely set up as yet */ 293 write_lock(&rx->call_lock); 294 295 pp = &rx->calls.rb_node; 296 parent = NULL; 297 while (*pp) { 298 parent = *pp; 299 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 300 301 if (p->user_call_ID < xcall->user_call_ID) 302 pp = &(*pp)->rb_left; 303 else if (p->user_call_ID > xcall->user_call_ID) 304 pp = &(*pp)->rb_right; 305 else 306 goto error_dup_user_ID; 307 } 308 309 rcu_assign_pointer(call->socket, rx); 310 call->user_call_ID = p->user_call_ID; 311 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 312 rxrpc_get_call(call, rxrpc_call_got_userid); 313 rb_link_node(&call->sock_node, parent, pp); 314 rb_insert_color(&call->sock_node, &rx->calls); 315 list_add(&call->sock_link, &rx->sock_calls); 316 317 write_unlock(&rx->call_lock); 318 319 rxnet = call->rxnet; 320 write_lock(&rxnet->call_lock); 321 list_add_tail(&call->link, &rxnet->calls); 322 write_unlock(&rxnet->call_lock); 323 324 /* From this point on, the call is protected by its own lock. */ 325 release_sock(&rx->sk); 326 327 /* Set up or get a connection record and set the protocol parameters, 328 * including channel number and call ID. 329 */ 330 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 331 if (ret < 0) 332 goto error_attached_to_socket; 333 334 trace_rxrpc_call(call->debug_id, rxrpc_call_connected, 335 atomic_read(&call->usage), here, NULL); 336 337 rxrpc_start_call_timer(call); 338 339 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 340 341 _leave(" = %p [new]", call); 342 return call; 343 344 /* We unexpectedly found the user ID in the list after taking 345 * the call_lock. This shouldn't happen unless the user races 346 * with itself and tries to add the same user ID twice at the 347 * same time in different threads. 348 */ 349 error_dup_user_ID: 350 write_unlock(&rx->call_lock); 351 release_sock(&rx->sk); 352 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 353 RX_CALL_DEAD, -EEXIST); 354 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 355 atomic_read(&call->usage), here, ERR_PTR(-EEXIST)); 356 rxrpc_release_call(rx, call); 357 mutex_unlock(&call->user_mutex); 358 rxrpc_put_call(call, rxrpc_call_put); 359 _leave(" = -EEXIST"); 360 return ERR_PTR(-EEXIST); 361 362 /* We got an error, but the call is attached to the socket and is in 363 * need of release. However, we might now race with recvmsg() when 364 * completing the call queues it. Return 0 from sys_sendmsg() and 365 * leave the error to recvmsg() to deal with. 366 */ 367 error_attached_to_socket: 368 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 369 atomic_read(&call->usage), here, ERR_PTR(ret)); 370 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 371 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 372 RX_CALL_DEAD, ret); 373 _leave(" = c=%08x [err]", call->debug_id); 374 return call; 375 } 376 377 /* 378 * Set up an incoming call. call->conn points to the connection. 379 * This is called in BH context and isn't allowed to fail. 380 */ 381 void rxrpc_incoming_call(struct rxrpc_sock *rx, 382 struct rxrpc_call *call, 383 struct sk_buff *skb) 384 { 385 struct rxrpc_connection *conn = call->conn; 386 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 387 u32 chan; 388 389 _enter(",%d", call->conn->debug_id); 390 391 rcu_assign_pointer(call->socket, rx); 392 call->call_id = sp->hdr.callNumber; 393 call->service_id = sp->hdr.serviceId; 394 call->cid = sp->hdr.cid; 395 call->state = RXRPC_CALL_SERVER_SECURING; 396 call->cong_tstamp = skb->tstamp; 397 398 /* Set the channel for this call. We don't get channel_lock as we're 399 * only defending against the data_ready handler (which we're called 400 * from) and the RESPONSE packet parser (which is only really 401 * interested in call_counter and can cope with a disagreement with the 402 * call pointer). 403 */ 404 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 405 conn->channels[chan].call_counter = call->call_id; 406 conn->channels[chan].call_id = call->call_id; 407 rcu_assign_pointer(conn->channels[chan].call, call); 408 409 spin_lock(&conn->params.peer->lock); 410 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 411 spin_unlock(&conn->params.peer->lock); 412 413 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 414 415 rxrpc_start_call_timer(call); 416 _leave(""); 417 } 418 419 /* 420 * Queue a call's work processor, getting a ref to pass to the work queue. 421 */ 422 bool rxrpc_queue_call(struct rxrpc_call *call) 423 { 424 const void *here = __builtin_return_address(0); 425 int n = atomic_fetch_add_unless(&call->usage, 1, 0); 426 if (n == 0) 427 return false; 428 if (rxrpc_queue_work(&call->processor)) 429 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, 430 here, NULL); 431 else 432 rxrpc_put_call(call, rxrpc_call_put_noqueue); 433 return true; 434 } 435 436 /* 437 * Queue a call's work processor, passing the callers ref to the work queue. 438 */ 439 bool __rxrpc_queue_call(struct rxrpc_call *call) 440 { 441 const void *here = __builtin_return_address(0); 442 int n = atomic_read(&call->usage); 443 ASSERTCMP(n, >=, 1); 444 if (rxrpc_queue_work(&call->processor)) 445 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, 446 here, NULL); 447 else 448 rxrpc_put_call(call, rxrpc_call_put_noqueue); 449 return true; 450 } 451 452 /* 453 * Note the re-emergence of a call. 454 */ 455 void rxrpc_see_call(struct rxrpc_call *call) 456 { 457 const void *here = __builtin_return_address(0); 458 if (call) { 459 int n = atomic_read(&call->usage); 460 461 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, 462 here, NULL); 463 } 464 } 465 466 /* 467 * Note the addition of a ref on a call. 468 */ 469 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 470 { 471 const void *here = __builtin_return_address(0); 472 int n = atomic_inc_return(&call->usage); 473 474 trace_rxrpc_call(call->debug_id, op, n, here, NULL); 475 } 476 477 /* 478 * Clean up the RxTx skb ring. 479 */ 480 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 481 { 482 int i; 483 484 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 485 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); 486 call->rxtx_buffer[i] = NULL; 487 } 488 } 489 490 /* 491 * Detach a call from its owning socket. 492 */ 493 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 494 { 495 const void *here = __builtin_return_address(0); 496 struct rxrpc_connection *conn = call->conn; 497 bool put = false; 498 499 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 500 501 trace_rxrpc_call(call->debug_id, rxrpc_call_release, 502 atomic_read(&call->usage), 503 here, (const void *)call->flags); 504 505 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 506 507 spin_lock_bh(&call->lock); 508 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 509 BUG(); 510 spin_unlock_bh(&call->lock); 511 512 rxrpc_put_call_slot(call); 513 514 del_timer_sync(&call->timer); 515 516 /* Make sure we don't get any more notifications */ 517 write_lock_bh(&rx->recvmsg_lock); 518 519 if (!list_empty(&call->recvmsg_link)) { 520 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 521 call, call->events, call->flags); 522 list_del(&call->recvmsg_link); 523 put = true; 524 } 525 526 /* list_empty() must return false in rxrpc_notify_socket() */ 527 call->recvmsg_link.next = NULL; 528 call->recvmsg_link.prev = NULL; 529 530 write_unlock_bh(&rx->recvmsg_lock); 531 if (put) 532 rxrpc_put_call(call, rxrpc_call_put); 533 534 write_lock(&rx->call_lock); 535 536 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 537 rb_erase(&call->sock_node, &rx->calls); 538 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 539 rxrpc_put_call(call, rxrpc_call_put_userid); 540 } 541 542 list_del(&call->sock_link); 543 write_unlock(&rx->call_lock); 544 545 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 546 547 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 548 rxrpc_disconnect_call(call); 549 if (call->security) 550 call->security->free_call_crypto(call); 551 _leave(""); 552 } 553 554 /* 555 * release all the calls associated with a socket 556 */ 557 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 558 { 559 struct rxrpc_call *call; 560 561 _enter("%p", rx); 562 563 while (!list_empty(&rx->to_be_accepted)) { 564 call = list_entry(rx->to_be_accepted.next, 565 struct rxrpc_call, accept_link); 566 list_del(&call->accept_link); 567 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 568 rxrpc_put_call(call, rxrpc_call_put); 569 } 570 571 while (!list_empty(&rx->sock_calls)) { 572 call = list_entry(rx->sock_calls.next, 573 struct rxrpc_call, sock_link); 574 rxrpc_get_call(call, rxrpc_call_got); 575 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 576 rxrpc_send_abort_packet(call); 577 rxrpc_release_call(rx, call); 578 rxrpc_put_call(call, rxrpc_call_put); 579 } 580 581 _leave(""); 582 } 583 584 /* 585 * release a call 586 */ 587 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 588 { 589 struct rxrpc_net *rxnet = call->rxnet; 590 const void *here = __builtin_return_address(0); 591 unsigned int debug_id = call->debug_id; 592 int n; 593 594 ASSERT(call != NULL); 595 596 n = atomic_dec_return(&call->usage); 597 trace_rxrpc_call(debug_id, op, n, here, NULL); 598 ASSERTCMP(n, >=, 0); 599 if (n == 0) { 600 _debug("call %d dead", call->debug_id); 601 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 602 603 if (!list_empty(&call->link)) { 604 write_lock(&rxnet->call_lock); 605 list_del_init(&call->link); 606 write_unlock(&rxnet->call_lock); 607 } 608 609 rxrpc_cleanup_call(call); 610 } 611 } 612 613 /* 614 * Final call destruction - but must be done in process context. 615 */ 616 static void rxrpc_destroy_call(struct work_struct *work) 617 { 618 struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); 619 struct rxrpc_net *rxnet = call->rxnet; 620 621 rxrpc_put_connection(call->conn); 622 rxrpc_put_peer(call->peer); 623 kfree(call->rxtx_buffer); 624 kfree(call->rxtx_annotations); 625 kmem_cache_free(rxrpc_call_jar, call); 626 if (atomic_dec_and_test(&rxnet->nr_calls)) 627 wake_up_var(&rxnet->nr_calls); 628 } 629 630 /* 631 * Final call destruction under RCU. 632 */ 633 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 634 { 635 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 636 637 if (in_softirq()) { 638 INIT_WORK(&call->processor, rxrpc_destroy_call); 639 if (!rxrpc_queue_work(&call->processor)) 640 BUG(); 641 } else { 642 rxrpc_destroy_call(&call->processor); 643 } 644 } 645 646 /* 647 * clean up a call 648 */ 649 void rxrpc_cleanup_call(struct rxrpc_call *call) 650 { 651 _net("DESTROY CALL %d", call->debug_id); 652 653 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 654 655 del_timer_sync(&call->timer); 656 657 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 658 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 659 660 rxrpc_cleanup_ring(call); 661 rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); 662 663 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 664 } 665 666 /* 667 * Make sure that all calls are gone from a network namespace. To reach this 668 * point, any open UDP sockets in that namespace must have been closed, so any 669 * outstanding calls cannot be doing I/O. 670 */ 671 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 672 { 673 struct rxrpc_call *call; 674 675 _enter(""); 676 677 if (!list_empty(&rxnet->calls)) { 678 write_lock(&rxnet->call_lock); 679 680 while (!list_empty(&rxnet->calls)) { 681 call = list_entry(rxnet->calls.next, 682 struct rxrpc_call, link); 683 _debug("Zapping call %p", call); 684 685 rxrpc_see_call(call); 686 list_del_init(&call->link); 687 688 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 689 call, atomic_read(&call->usage), 690 rxrpc_call_states[call->state], 691 call->flags, call->events); 692 693 write_unlock(&rxnet->call_lock); 694 cond_resched(); 695 write_lock(&rxnet->call_lock); 696 } 697 698 write_unlock(&rxnet->call_lock); 699 } 700 701 atomic_dec(&rxnet->nr_calls); 702 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 703 } 704