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_ACCEPTING] = "SvAccept", 27 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 28 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 29 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 30 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 31 [RXRPC_CALL_COMPLETE] = "Complete", 32 }; 33 34 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 35 [RXRPC_CALL_SUCCEEDED] = "Complete", 36 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 37 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 38 [RXRPC_CALL_LOCAL_ERROR] = "LocError", 39 [RXRPC_CALL_NETWORK_ERROR] = "NetError", 40 }; 41 42 struct kmem_cache *rxrpc_call_jar; 43 44 static struct semaphore rxrpc_call_limiter = 45 __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000); 46 static struct semaphore rxrpc_kernel_call_limiter = 47 __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); 48 49 static void rxrpc_call_timer_expired(struct timer_list *t) 50 { 51 struct rxrpc_call *call = from_timer(call, t, timer); 52 53 _enter("%d", call->debug_id); 54 55 if (call->state < RXRPC_CALL_COMPLETE) { 56 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 57 rxrpc_queue_call(call); 58 } 59 } 60 61 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 62 63 /* 64 * find an extant server call 65 * - called in process context with IRQs enabled 66 */ 67 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 68 unsigned long user_call_ID) 69 { 70 struct rxrpc_call *call; 71 struct rb_node *p; 72 73 _enter("%p,%lx", rx, user_call_ID); 74 75 read_lock(&rx->call_lock); 76 77 p = rx->calls.rb_node; 78 while (p) { 79 call = rb_entry(p, struct rxrpc_call, sock_node); 80 81 if (user_call_ID < call->user_call_ID) 82 p = p->rb_left; 83 else if (user_call_ID > call->user_call_ID) 84 p = p->rb_right; 85 else 86 goto found_extant_call; 87 } 88 89 read_unlock(&rx->call_lock); 90 _leave(" = NULL"); 91 return NULL; 92 93 found_extant_call: 94 rxrpc_get_call(call, rxrpc_call_got); 95 read_unlock(&rx->call_lock); 96 _leave(" = %p [%d]", call, atomic_read(&call->usage)); 97 return call; 98 } 99 100 /* 101 * allocate a new call 102 */ 103 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 104 unsigned int debug_id) 105 { 106 struct rxrpc_call *call; 107 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 108 109 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 110 if (!call) 111 return NULL; 112 113 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 114 sizeof(struct sk_buff *), 115 gfp); 116 if (!call->rxtx_buffer) 117 goto nomem; 118 119 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 120 if (!call->rxtx_annotations) 121 goto nomem_2; 122 123 mutex_init(&call->user_mutex); 124 125 /* Prevent lockdep reporting a deadlock false positive between the afs 126 * filesystem and sys_sendmsg() via the mmap sem. 127 */ 128 if (rx->sk.sk_kern_sock) 129 lockdep_set_class(&call->user_mutex, 130 &rxrpc_call_user_mutex_lock_class_key); 131 132 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 133 INIT_WORK(&call->processor, &rxrpc_process_call); 134 INIT_LIST_HEAD(&call->link); 135 INIT_LIST_HEAD(&call->chan_wait_link); 136 INIT_LIST_HEAD(&call->accept_link); 137 INIT_LIST_HEAD(&call->recvmsg_link); 138 INIT_LIST_HEAD(&call->sock_link); 139 init_waitqueue_head(&call->waitq); 140 spin_lock_init(&call->lock); 141 spin_lock_init(&call->notify_lock); 142 spin_lock_init(&call->input_lock); 143 rwlock_init(&call->state_lock); 144 atomic_set(&call->usage, 1); 145 call->debug_id = debug_id; 146 call->tx_total_len = -1; 147 call->next_rx_timo = 20 * HZ; 148 call->next_req_timo = 1 * HZ; 149 150 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 151 152 /* Leave space in the ring to handle a maxed-out jumbo packet */ 153 call->rx_winsize = rxrpc_rx_window_size; 154 call->tx_winsize = 16; 155 call->rx_expect_next = 1; 156 157 call->cong_cwnd = 2; 158 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 159 160 call->rxnet = rxnet; 161 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 162 atomic_inc(&rxnet->nr_calls); 163 return call; 164 165 nomem_2: 166 kfree(call->rxtx_buffer); 167 nomem: 168 kmem_cache_free(rxrpc_call_jar, call); 169 return NULL; 170 } 171 172 /* 173 * Allocate a new client call. 174 */ 175 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 176 struct sockaddr_rxrpc *srx, 177 gfp_t gfp, 178 unsigned int debug_id) 179 { 180 struct rxrpc_call *call; 181 ktime_t now; 182 183 _enter(""); 184 185 call = rxrpc_alloc_call(rx, gfp, debug_id); 186 if (!call) 187 return ERR_PTR(-ENOMEM); 188 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 189 call->service_id = srx->srx_service; 190 call->tx_phase = true; 191 now = ktime_get_real(); 192 call->acks_latest_ts = now; 193 call->cong_tstamp = now; 194 195 _leave(" = %p", call); 196 return call; 197 } 198 199 /* 200 * Initiate the call ack/resend/expiry timer. 201 */ 202 static void rxrpc_start_call_timer(struct rxrpc_call *call) 203 { 204 unsigned long now = jiffies; 205 unsigned long j = now + MAX_JIFFY_OFFSET; 206 207 call->ack_at = j; 208 call->ack_lost_at = j; 209 call->resend_at = j; 210 call->ping_at = j; 211 call->expect_rx_by = j; 212 call->expect_req_by = j; 213 call->expect_term_by = j; 214 call->timer.expires = now; 215 } 216 217 /* 218 * Wait for a call slot to become available. 219 */ 220 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 221 { 222 struct semaphore *limiter = &rxrpc_call_limiter; 223 224 if (p->kernel) 225 limiter = &rxrpc_kernel_call_limiter; 226 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 227 down(limiter); 228 return limiter; 229 } 230 return down_interruptible(limiter) < 0 ? NULL : limiter; 231 } 232 233 /* 234 * Release a call slot. 235 */ 236 static void rxrpc_put_call_slot(struct rxrpc_call *call) 237 { 238 struct semaphore *limiter = &rxrpc_call_limiter; 239 240 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 241 limiter = &rxrpc_kernel_call_limiter; 242 up(limiter); 243 } 244 245 /* 246 * Set up a call for the given parameters. 247 * - Called with the socket lock held, which it must release. 248 * - If it returns a call, the call's lock will need releasing by the caller. 249 */ 250 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 251 struct rxrpc_conn_parameters *cp, 252 struct sockaddr_rxrpc *srx, 253 struct rxrpc_call_params *p, 254 gfp_t gfp, 255 unsigned int debug_id) 256 __releases(&rx->sk.sk_lock.slock) 257 __acquires(&call->user_mutex) 258 { 259 struct rxrpc_call *call, *xcall; 260 struct rxrpc_net *rxnet; 261 struct semaphore *limiter; 262 struct rb_node *parent, **pp; 263 const void *here = __builtin_return_address(0); 264 int ret; 265 266 _enter("%p,%lx", rx, p->user_call_ID); 267 268 limiter = rxrpc_get_call_slot(p, gfp); 269 if (!limiter) 270 return ERR_PTR(-ERESTARTSYS); 271 272 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 273 if (IS_ERR(call)) { 274 release_sock(&rx->sk); 275 up(limiter); 276 _leave(" = %ld", PTR_ERR(call)); 277 return call; 278 } 279 280 call->interruptibility = p->interruptibility; 281 call->tx_total_len = p->tx_total_len; 282 trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, 283 atomic_read(&call->usage), 284 here, (const void *)p->user_call_ID); 285 if (p->kernel) 286 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 287 288 /* We need to protect a partially set up call against the user as we 289 * will be acting outside the socket lock. 290 */ 291 mutex_lock(&call->user_mutex); 292 293 /* Publish the call, even though it is incompletely set up as yet */ 294 write_lock(&rx->call_lock); 295 296 pp = &rx->calls.rb_node; 297 parent = NULL; 298 while (*pp) { 299 parent = *pp; 300 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 301 302 if (p->user_call_ID < xcall->user_call_ID) 303 pp = &(*pp)->rb_left; 304 else if (p->user_call_ID > xcall->user_call_ID) 305 pp = &(*pp)->rb_right; 306 else 307 goto error_dup_user_ID; 308 } 309 310 rcu_assign_pointer(call->socket, rx); 311 call->user_call_ID = p->user_call_ID; 312 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 313 rxrpc_get_call(call, rxrpc_call_got_userid); 314 rb_link_node(&call->sock_node, parent, pp); 315 rb_insert_color(&call->sock_node, &rx->calls); 316 list_add(&call->sock_link, &rx->sock_calls); 317 318 write_unlock(&rx->call_lock); 319 320 rxnet = call->rxnet; 321 write_lock(&rxnet->call_lock); 322 list_add_tail(&call->link, &rxnet->calls); 323 write_unlock(&rxnet->call_lock); 324 325 /* From this point on, the call is protected by its own lock. */ 326 release_sock(&rx->sk); 327 328 /* Set up or get a connection record and set the protocol parameters, 329 * including channel number and call ID. 330 */ 331 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 332 if (ret < 0) 333 goto error_attached_to_socket; 334 335 trace_rxrpc_call(call->debug_id, rxrpc_call_connected, 336 atomic_read(&call->usage), here, NULL); 337 338 rxrpc_start_call_timer(call); 339 340 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 341 342 _leave(" = %p [new]", call); 343 return call; 344 345 /* We unexpectedly found the user ID in the list after taking 346 * the call_lock. This shouldn't happen unless the user races 347 * with itself and tries to add the same user ID twice at the 348 * same time in different threads. 349 */ 350 error_dup_user_ID: 351 write_unlock(&rx->call_lock); 352 release_sock(&rx->sk); 353 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 354 RX_CALL_DEAD, -EEXIST); 355 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 356 atomic_read(&call->usage), here, ERR_PTR(-EEXIST)); 357 rxrpc_release_call(rx, call); 358 mutex_unlock(&call->user_mutex); 359 rxrpc_put_call(call, rxrpc_call_put); 360 _leave(" = -EEXIST"); 361 return ERR_PTR(-EEXIST); 362 363 /* We got an error, but the call is attached to the socket and is in 364 * need of release. However, we might now race with recvmsg() when 365 * completing the call queues it. Return 0 from sys_sendmsg() and 366 * leave the error to recvmsg() to deal with. 367 */ 368 error_attached_to_socket: 369 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 370 atomic_read(&call->usage), here, ERR_PTR(ret)); 371 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 372 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 373 RX_CALL_DEAD, ret); 374 _leave(" = c=%08x [err]", call->debug_id); 375 return call; 376 } 377 378 /* 379 * Set up an incoming call. call->conn points to the connection. 380 * This is called in BH context and isn't allowed to fail. 381 */ 382 void rxrpc_incoming_call(struct rxrpc_sock *rx, 383 struct rxrpc_call *call, 384 struct sk_buff *skb) 385 { 386 struct rxrpc_connection *conn = call->conn; 387 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 388 u32 chan; 389 390 _enter(",%d", call->conn->debug_id); 391 392 rcu_assign_pointer(call->socket, rx); 393 call->call_id = sp->hdr.callNumber; 394 call->service_id = sp->hdr.serviceId; 395 call->cid = sp->hdr.cid; 396 call->state = RXRPC_CALL_SERVER_ACCEPTING; 397 if (sp->hdr.securityIndex > 0) 398 call->state = RXRPC_CALL_SERVER_SECURING; 399 call->cong_tstamp = skb->tstamp; 400 401 /* Set the channel for this call. We don't get channel_lock as we're 402 * only defending against the data_ready handler (which we're called 403 * from) and the RESPONSE packet parser (which is only really 404 * interested in call_counter and can cope with a disagreement with the 405 * call pointer). 406 */ 407 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 408 conn->channels[chan].call_counter = call->call_id; 409 conn->channels[chan].call_id = call->call_id; 410 rcu_assign_pointer(conn->channels[chan].call, call); 411 412 spin_lock(&conn->params.peer->lock); 413 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 414 spin_unlock(&conn->params.peer->lock); 415 416 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 417 418 rxrpc_start_call_timer(call); 419 _leave(""); 420 } 421 422 /* 423 * Queue a call's work processor, getting a ref to pass to the work queue. 424 */ 425 bool rxrpc_queue_call(struct rxrpc_call *call) 426 { 427 const void *here = __builtin_return_address(0); 428 int n = atomic_fetch_add_unless(&call->usage, 1, 0); 429 if (n == 0) 430 return false; 431 if (rxrpc_queue_work(&call->processor)) 432 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, 433 here, NULL); 434 else 435 rxrpc_put_call(call, rxrpc_call_put_noqueue); 436 return true; 437 } 438 439 /* 440 * Queue a call's work processor, passing the callers ref to the work queue. 441 */ 442 bool __rxrpc_queue_call(struct rxrpc_call *call) 443 { 444 const void *here = __builtin_return_address(0); 445 int n = atomic_read(&call->usage); 446 ASSERTCMP(n, >=, 1); 447 if (rxrpc_queue_work(&call->processor)) 448 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, 449 here, NULL); 450 else 451 rxrpc_put_call(call, rxrpc_call_put_noqueue); 452 return true; 453 } 454 455 /* 456 * Note the re-emergence of a call. 457 */ 458 void rxrpc_see_call(struct rxrpc_call *call) 459 { 460 const void *here = __builtin_return_address(0); 461 if (call) { 462 int n = atomic_read(&call->usage); 463 464 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, 465 here, NULL); 466 } 467 } 468 469 /* 470 * Note the addition of a ref on a call. 471 */ 472 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 473 { 474 const void *here = __builtin_return_address(0); 475 int n = atomic_inc_return(&call->usage); 476 477 trace_rxrpc_call(call->debug_id, op, n, here, NULL); 478 } 479 480 /* 481 * Clean up the RxTx skb ring. 482 */ 483 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 484 { 485 int i; 486 487 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 488 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); 489 call->rxtx_buffer[i] = NULL; 490 } 491 } 492 493 /* 494 * Detach a call from its owning socket. 495 */ 496 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 497 { 498 const void *here = __builtin_return_address(0); 499 struct rxrpc_connection *conn = call->conn; 500 bool put = false; 501 502 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 503 504 trace_rxrpc_call(call->debug_id, rxrpc_call_release, 505 atomic_read(&call->usage), 506 here, (const void *)call->flags); 507 508 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 509 510 spin_lock_bh(&call->lock); 511 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 512 BUG(); 513 spin_unlock_bh(&call->lock); 514 515 rxrpc_put_call_slot(call); 516 517 del_timer_sync(&call->timer); 518 519 /* Make sure we don't get any more notifications */ 520 write_lock_bh(&rx->recvmsg_lock); 521 522 if (!list_empty(&call->recvmsg_link)) { 523 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 524 call, call->events, call->flags); 525 list_del(&call->recvmsg_link); 526 put = true; 527 } 528 529 /* list_empty() must return false in rxrpc_notify_socket() */ 530 call->recvmsg_link.next = NULL; 531 call->recvmsg_link.prev = NULL; 532 533 write_unlock_bh(&rx->recvmsg_lock); 534 if (put) 535 rxrpc_put_call(call, rxrpc_call_put); 536 537 write_lock(&rx->call_lock); 538 539 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 540 rb_erase(&call->sock_node, &rx->calls); 541 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 542 rxrpc_put_call(call, rxrpc_call_put_userid); 543 } 544 545 list_del(&call->sock_link); 546 write_unlock(&rx->call_lock); 547 548 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 549 550 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 551 rxrpc_disconnect_call(call); 552 if (call->security) 553 call->security->free_call_crypto(call); 554 555 rxrpc_cleanup_ring(call); 556 _leave(""); 557 } 558 559 /* 560 * release all the calls associated with a socket 561 */ 562 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 563 { 564 struct rxrpc_call *call; 565 566 _enter("%p", rx); 567 568 while (!list_empty(&rx->to_be_accepted)) { 569 call = list_entry(rx->to_be_accepted.next, 570 struct rxrpc_call, accept_link); 571 list_del(&call->accept_link); 572 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 573 rxrpc_put_call(call, rxrpc_call_put); 574 } 575 576 while (!list_empty(&rx->sock_calls)) { 577 call = list_entry(rx->sock_calls.next, 578 struct rxrpc_call, sock_link); 579 rxrpc_get_call(call, rxrpc_call_got); 580 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 581 rxrpc_send_abort_packet(call); 582 rxrpc_release_call(rx, call); 583 rxrpc_put_call(call, rxrpc_call_put); 584 } 585 586 _leave(""); 587 } 588 589 /* 590 * release a call 591 */ 592 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 593 { 594 struct rxrpc_net *rxnet = call->rxnet; 595 const void *here = __builtin_return_address(0); 596 unsigned int debug_id = call->debug_id; 597 int n; 598 599 ASSERT(call != NULL); 600 601 n = atomic_dec_return(&call->usage); 602 trace_rxrpc_call(debug_id, op, n, here, NULL); 603 ASSERTCMP(n, >=, 0); 604 if (n == 0) { 605 _debug("call %d dead", call->debug_id); 606 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 607 608 if (!list_empty(&call->link)) { 609 write_lock(&rxnet->call_lock); 610 list_del_init(&call->link); 611 write_unlock(&rxnet->call_lock); 612 } 613 614 rxrpc_cleanup_call(call); 615 } 616 } 617 618 /* 619 * Final call destruction - but must be done in process context. 620 */ 621 static void rxrpc_destroy_call(struct work_struct *work) 622 { 623 struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); 624 struct rxrpc_net *rxnet = call->rxnet; 625 626 rxrpc_put_connection(call->conn); 627 rxrpc_put_peer(call->peer); 628 kfree(call->rxtx_buffer); 629 kfree(call->rxtx_annotations); 630 kmem_cache_free(rxrpc_call_jar, call); 631 if (atomic_dec_and_test(&rxnet->nr_calls)) 632 wake_up_var(&rxnet->nr_calls); 633 } 634 635 /* 636 * Final call destruction under RCU. 637 */ 638 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 639 { 640 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 641 642 if (in_softirq()) { 643 INIT_WORK(&call->processor, rxrpc_destroy_call); 644 if (!rxrpc_queue_work(&call->processor)) 645 BUG(); 646 } else { 647 rxrpc_destroy_call(&call->processor); 648 } 649 } 650 651 /* 652 * clean up a call 653 */ 654 void rxrpc_cleanup_call(struct rxrpc_call *call) 655 { 656 _net("DESTROY CALL %d", call->debug_id); 657 658 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 659 660 del_timer_sync(&call->timer); 661 662 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 663 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 664 665 rxrpc_cleanup_ring(call); 666 rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); 667 668 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 669 } 670 671 /* 672 * Make sure that all calls are gone from a network namespace. To reach this 673 * point, any open UDP sockets in that namespace must have been closed, so any 674 * outstanding calls cannot be doing I/O. 675 */ 676 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 677 { 678 struct rxrpc_call *call; 679 680 _enter(""); 681 682 if (!list_empty(&rxnet->calls)) { 683 write_lock(&rxnet->call_lock); 684 685 while (!list_empty(&rxnet->calls)) { 686 call = list_entry(rxnet->calls.next, 687 struct rxrpc_call, link); 688 _debug("Zapping call %p", call); 689 690 rxrpc_see_call(call); 691 list_del_init(&call->link); 692 693 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 694 call, atomic_read(&call->usage), 695 rxrpc_call_states[call->state], 696 call->flags, call->events); 697 698 write_unlock(&rxnet->call_lock); 699 cond_resched(); 700 write_lock(&rxnet->call_lock); 701 } 702 703 write_unlock(&rxnet->call_lock); 704 } 705 706 atomic_dec(&rxnet->nr_calls); 707 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 708 } 709