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_expired(call, jiffies); 56 __rxrpc_queue_call(call); 57 } else { 58 rxrpc_put_call(call, rxrpc_call_put); 59 } 60 } 61 62 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 63 unsigned long expire_at, 64 unsigned long now, 65 enum rxrpc_timer_trace why) 66 { 67 if (rxrpc_try_get_call(call, rxrpc_call_got_timer)) { 68 trace_rxrpc_timer(call, why, now); 69 if (timer_reduce(&call->timer, expire_at)) 70 rxrpc_put_call(call, rxrpc_call_put_notimer); 71 } 72 } 73 74 void rxrpc_delete_call_timer(struct rxrpc_call *call) 75 { 76 if (del_timer_sync(&call->timer)) 77 rxrpc_put_call(call, rxrpc_call_put_timer); 78 } 79 80 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 81 82 /* 83 * find an extant server call 84 * - called in process context with IRQs enabled 85 */ 86 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 87 unsigned long user_call_ID) 88 { 89 struct rxrpc_call *call; 90 struct rb_node *p; 91 92 _enter("%p,%lx", rx, user_call_ID); 93 94 read_lock(&rx->call_lock); 95 96 p = rx->calls.rb_node; 97 while (p) { 98 call = rb_entry(p, struct rxrpc_call, sock_node); 99 100 if (user_call_ID < call->user_call_ID) 101 p = p->rb_left; 102 else if (user_call_ID > call->user_call_ID) 103 p = p->rb_right; 104 else 105 goto found_extant_call; 106 } 107 108 read_unlock(&rx->call_lock); 109 _leave(" = NULL"); 110 return NULL; 111 112 found_extant_call: 113 rxrpc_get_call(call, rxrpc_call_got); 114 read_unlock(&rx->call_lock); 115 _leave(" = %p [%d]", call, refcount_read(&call->ref)); 116 return call; 117 } 118 119 /* 120 * allocate a new call 121 */ 122 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 123 unsigned int debug_id) 124 { 125 struct rxrpc_call *call; 126 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 127 128 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 129 if (!call) 130 return NULL; 131 132 mutex_init(&call->user_mutex); 133 134 /* Prevent lockdep reporting a deadlock false positive between the afs 135 * filesystem and sys_sendmsg() via the mmap sem. 136 */ 137 if (rx->sk.sk_kern_sock) 138 lockdep_set_class(&call->user_mutex, 139 &rxrpc_call_user_mutex_lock_class_key); 140 141 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 142 INIT_WORK(&call->processor, &rxrpc_process_call); 143 INIT_LIST_HEAD(&call->link); 144 INIT_LIST_HEAD(&call->chan_wait_link); 145 INIT_LIST_HEAD(&call->accept_link); 146 INIT_LIST_HEAD(&call->recvmsg_link); 147 INIT_LIST_HEAD(&call->sock_link); 148 INIT_LIST_HEAD(&call->tx_buffer); 149 skb_queue_head_init(&call->recvmsg_queue); 150 skb_queue_head_init(&call->rx_oos_queue); 151 init_waitqueue_head(&call->waitq); 152 spin_lock_init(&call->notify_lock); 153 spin_lock_init(&call->tx_lock); 154 spin_lock_init(&call->input_lock); 155 spin_lock_init(&call->acks_ack_lock); 156 rwlock_init(&call->state_lock); 157 refcount_set(&call->ref, 1); 158 call->debug_id = debug_id; 159 call->tx_total_len = -1; 160 call->next_rx_timo = 20 * HZ; 161 call->next_req_timo = 1 * HZ; 162 atomic64_set(&call->ackr_window, 0x100000001ULL); 163 164 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 165 166 call->rx_winsize = rxrpc_rx_window_size; 167 call->tx_winsize = 16; 168 169 if (RXRPC_TX_SMSS > 2190) 170 call->cong_cwnd = 2; 171 else if (RXRPC_TX_SMSS > 1095) 172 call->cong_cwnd = 3; 173 else 174 call->cong_cwnd = 4; 175 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; 176 177 call->rxnet = rxnet; 178 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 179 atomic_inc(&rxnet->nr_calls); 180 return call; 181 } 182 183 /* 184 * Allocate a new client call. 185 */ 186 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 187 struct sockaddr_rxrpc *srx, 188 gfp_t gfp, 189 unsigned int debug_id) 190 { 191 struct rxrpc_call *call; 192 ktime_t now; 193 194 _enter(""); 195 196 call = rxrpc_alloc_call(rx, gfp, debug_id); 197 if (!call) 198 return ERR_PTR(-ENOMEM); 199 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 200 call->service_id = srx->srx_service; 201 now = ktime_get_real(); 202 call->acks_latest_ts = now; 203 call->cong_tstamp = now; 204 205 _leave(" = %p", call); 206 return call; 207 } 208 209 /* 210 * Initiate the call ack/resend/expiry timer. 211 */ 212 static void rxrpc_start_call_timer(struct rxrpc_call *call) 213 { 214 unsigned long now = jiffies; 215 unsigned long j = now + MAX_JIFFY_OFFSET; 216 217 call->delay_ack_at = j; 218 call->ack_lost_at = j; 219 call->resend_at = j; 220 call->ping_at = j; 221 call->expect_rx_by = j; 222 call->expect_req_by = j; 223 call->expect_term_by = j; 224 call->timer.expires = now; 225 } 226 227 /* 228 * Wait for a call slot to become available. 229 */ 230 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 231 { 232 struct semaphore *limiter = &rxrpc_call_limiter; 233 234 if (p->kernel) 235 limiter = &rxrpc_kernel_call_limiter; 236 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 237 down(limiter); 238 return limiter; 239 } 240 return down_interruptible(limiter) < 0 ? NULL : limiter; 241 } 242 243 /* 244 * Release a call slot. 245 */ 246 static void rxrpc_put_call_slot(struct rxrpc_call *call) 247 { 248 struct semaphore *limiter = &rxrpc_call_limiter; 249 250 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 251 limiter = &rxrpc_kernel_call_limiter; 252 up(limiter); 253 } 254 255 /* 256 * Set up a call for the given parameters. 257 * - Called with the socket lock held, which it must release. 258 * - If it returns a call, the call's lock will need releasing by the caller. 259 */ 260 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 261 struct rxrpc_conn_parameters *cp, 262 struct sockaddr_rxrpc *srx, 263 struct rxrpc_call_params *p, 264 gfp_t gfp, 265 unsigned int debug_id) 266 __releases(&rx->sk.sk_lock.slock) 267 __acquires(&call->user_mutex) 268 { 269 struct rxrpc_call *call, *xcall; 270 struct rxrpc_net *rxnet; 271 struct semaphore *limiter; 272 struct rb_node *parent, **pp; 273 const void *here = __builtin_return_address(0); 274 int ret; 275 276 _enter("%p,%lx", rx, p->user_call_ID); 277 278 limiter = rxrpc_get_call_slot(p, gfp); 279 if (!limiter) { 280 release_sock(&rx->sk); 281 return ERR_PTR(-ERESTARTSYS); 282 } 283 284 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 285 if (IS_ERR(call)) { 286 release_sock(&rx->sk); 287 up(limiter); 288 _leave(" = %ld", PTR_ERR(call)); 289 return call; 290 } 291 292 call->interruptibility = p->interruptibility; 293 call->tx_total_len = p->tx_total_len; 294 trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, 295 refcount_read(&call->ref), 296 here, (const void *)p->user_call_ID); 297 if (p->kernel) 298 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 299 300 /* We need to protect a partially set up call against the user as we 301 * will be acting outside the socket lock. 302 */ 303 mutex_lock(&call->user_mutex); 304 305 /* Publish the call, even though it is incompletely set up as yet */ 306 write_lock(&rx->call_lock); 307 308 pp = &rx->calls.rb_node; 309 parent = NULL; 310 while (*pp) { 311 parent = *pp; 312 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 313 314 if (p->user_call_ID < xcall->user_call_ID) 315 pp = &(*pp)->rb_left; 316 else if (p->user_call_ID > xcall->user_call_ID) 317 pp = &(*pp)->rb_right; 318 else 319 goto error_dup_user_ID; 320 } 321 322 rcu_assign_pointer(call->socket, rx); 323 call->user_call_ID = p->user_call_ID; 324 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 325 rxrpc_get_call(call, rxrpc_call_got_userid); 326 rb_link_node(&call->sock_node, parent, pp); 327 rb_insert_color(&call->sock_node, &rx->calls); 328 list_add(&call->sock_link, &rx->sock_calls); 329 330 write_unlock(&rx->call_lock); 331 332 rxnet = call->rxnet; 333 spin_lock_bh(&rxnet->call_lock); 334 list_add_tail_rcu(&call->link, &rxnet->calls); 335 spin_unlock_bh(&rxnet->call_lock); 336 337 /* From this point on, the call is protected by its own lock. */ 338 release_sock(&rx->sk); 339 340 /* Set up or get a connection record and set the protocol parameters, 341 * including channel number and call ID. 342 */ 343 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 344 if (ret < 0) 345 goto error_attached_to_socket; 346 347 trace_rxrpc_call(call->debug_id, rxrpc_call_connected, 348 refcount_read(&call->ref), here, NULL); 349 350 rxrpc_start_call_timer(call); 351 352 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 353 354 _leave(" = %p [new]", call); 355 return call; 356 357 /* We unexpectedly found the user ID in the list after taking 358 * the call_lock. This shouldn't happen unless the user races 359 * with itself and tries to add the same user ID twice at the 360 * same time in different threads. 361 */ 362 error_dup_user_ID: 363 write_unlock(&rx->call_lock); 364 release_sock(&rx->sk); 365 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 366 RX_CALL_DEAD, -EEXIST); 367 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 368 refcount_read(&call->ref), here, ERR_PTR(-EEXIST)); 369 rxrpc_release_call(rx, call); 370 mutex_unlock(&call->user_mutex); 371 rxrpc_put_call(call, rxrpc_call_put); 372 _leave(" = -EEXIST"); 373 return ERR_PTR(-EEXIST); 374 375 /* We got an error, but the call is attached to the socket and is in 376 * need of release. However, we might now race with recvmsg() when 377 * completing the call queues it. Return 0 from sys_sendmsg() and 378 * leave the error to recvmsg() to deal with. 379 */ 380 error_attached_to_socket: 381 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 382 refcount_read(&call->ref), here, ERR_PTR(ret)); 383 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 384 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 385 RX_CALL_DEAD, ret); 386 _leave(" = c=%08x [err]", call->debug_id); 387 return call; 388 } 389 390 /* 391 * Set up an incoming call. call->conn points to the connection. 392 * This is called in BH context and isn't allowed to fail. 393 */ 394 void rxrpc_incoming_call(struct rxrpc_sock *rx, 395 struct rxrpc_call *call, 396 struct sk_buff *skb) 397 { 398 struct rxrpc_connection *conn = call->conn; 399 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 400 u32 chan; 401 402 _enter(",%d", call->conn->debug_id); 403 404 rcu_assign_pointer(call->socket, rx); 405 call->call_id = sp->hdr.callNumber; 406 call->service_id = sp->hdr.serviceId; 407 call->cid = sp->hdr.cid; 408 call->state = RXRPC_CALL_SERVER_SECURING; 409 call->cong_tstamp = skb->tstamp; 410 411 /* Set the channel for this call. We don't get channel_lock as we're 412 * only defending against the data_ready handler (which we're called 413 * from) and the RESPONSE packet parser (which is only really 414 * interested in call_counter and can cope with a disagreement with the 415 * call pointer). 416 */ 417 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 418 conn->channels[chan].call_counter = call->call_id; 419 conn->channels[chan].call_id = call->call_id; 420 rcu_assign_pointer(conn->channels[chan].call, call); 421 422 spin_lock(&conn->params.peer->lock); 423 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 424 spin_unlock(&conn->params.peer->lock); 425 426 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 427 428 rxrpc_start_call_timer(call); 429 _leave(""); 430 } 431 432 /* 433 * Queue a call's work processor, getting a ref to pass to the work queue. 434 */ 435 bool rxrpc_queue_call(struct rxrpc_call *call) 436 { 437 const void *here = __builtin_return_address(0); 438 int n; 439 440 if (!__refcount_inc_not_zero(&call->ref, &n)) 441 return false; 442 if (rxrpc_queue_work(&call->processor)) 443 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, 444 here, NULL); 445 else 446 rxrpc_put_call(call, rxrpc_call_put_noqueue); 447 return true; 448 } 449 450 /* 451 * Queue a call's work processor, passing the callers ref to the work queue. 452 */ 453 bool __rxrpc_queue_call(struct rxrpc_call *call) 454 { 455 const void *here = __builtin_return_address(0); 456 int n = refcount_read(&call->ref); 457 ASSERTCMP(n, >=, 1); 458 if (rxrpc_queue_work(&call->processor)) 459 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, 460 here, NULL); 461 else 462 rxrpc_put_call(call, rxrpc_call_put_noqueue); 463 return true; 464 } 465 466 /* 467 * Note the re-emergence of a call. 468 */ 469 void rxrpc_see_call(struct rxrpc_call *call) 470 { 471 const void *here = __builtin_return_address(0); 472 if (call) { 473 int n = refcount_read(&call->ref); 474 475 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, 476 here, NULL); 477 } 478 } 479 480 bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 481 { 482 const void *here = __builtin_return_address(0); 483 int n; 484 485 if (!__refcount_inc_not_zero(&call->ref, &n)) 486 return false; 487 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); 488 return true; 489 } 490 491 /* 492 * Note the addition of a ref on a call. 493 */ 494 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 495 { 496 const void *here = __builtin_return_address(0); 497 int n; 498 499 __refcount_inc(&call->ref, &n); 500 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); 501 } 502 503 /* 504 * Clean up the Rx skb ring. 505 */ 506 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 507 { 508 skb_queue_purge(&call->recvmsg_queue); 509 skb_queue_purge(&call->rx_oos_queue); 510 } 511 512 /* 513 * Detach a call from its owning socket. 514 */ 515 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 516 { 517 const void *here = __builtin_return_address(0); 518 struct rxrpc_connection *conn = call->conn; 519 bool put = false; 520 521 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 522 523 trace_rxrpc_call(call->debug_id, rxrpc_call_release, 524 refcount_read(&call->ref), 525 here, (const void *)call->flags); 526 527 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 528 529 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 530 BUG(); 531 532 rxrpc_put_call_slot(call); 533 rxrpc_delete_call_timer(call); 534 535 /* Make sure we don't get any more notifications */ 536 write_lock_bh(&rx->recvmsg_lock); 537 538 if (!list_empty(&call->recvmsg_link)) { 539 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 540 call, call->events, call->flags); 541 list_del(&call->recvmsg_link); 542 put = true; 543 } 544 545 /* list_empty() must return false in rxrpc_notify_socket() */ 546 call->recvmsg_link.next = NULL; 547 call->recvmsg_link.prev = NULL; 548 549 write_unlock_bh(&rx->recvmsg_lock); 550 if (put) 551 rxrpc_put_call(call, rxrpc_call_put); 552 553 write_lock(&rx->call_lock); 554 555 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 556 rb_erase(&call->sock_node, &rx->calls); 557 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 558 rxrpc_put_call(call, rxrpc_call_put_userid); 559 } 560 561 list_del(&call->sock_link); 562 write_unlock(&rx->call_lock); 563 564 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 565 566 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 567 rxrpc_disconnect_call(call); 568 if (call->security) 569 call->security->free_call_crypto(call); 570 _leave(""); 571 } 572 573 /* 574 * release all the calls associated with a socket 575 */ 576 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 577 { 578 struct rxrpc_call *call; 579 580 _enter("%p", rx); 581 582 while (!list_empty(&rx->to_be_accepted)) { 583 call = list_entry(rx->to_be_accepted.next, 584 struct rxrpc_call, accept_link); 585 list_del(&call->accept_link); 586 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 587 rxrpc_put_call(call, rxrpc_call_put); 588 } 589 590 while (!list_empty(&rx->sock_calls)) { 591 call = list_entry(rx->sock_calls.next, 592 struct rxrpc_call, sock_link); 593 rxrpc_get_call(call, rxrpc_call_got); 594 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 595 rxrpc_send_abort_packet(call); 596 rxrpc_release_call(rx, call); 597 rxrpc_put_call(call, rxrpc_call_put); 598 } 599 600 _leave(""); 601 } 602 603 /* 604 * release a call 605 */ 606 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 607 { 608 struct rxrpc_net *rxnet = call->rxnet; 609 const void *here = __builtin_return_address(0); 610 unsigned int debug_id = call->debug_id; 611 bool dead; 612 int n; 613 614 ASSERT(call != NULL); 615 616 dead = __refcount_dec_and_test(&call->ref, &n); 617 trace_rxrpc_call(debug_id, op, n, here, NULL); 618 if (dead) { 619 _debug("call %d dead", call->debug_id); 620 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 621 622 if (!list_empty(&call->link)) { 623 spin_lock_bh(&rxnet->call_lock); 624 list_del_init(&call->link); 625 spin_unlock_bh(&rxnet->call_lock); 626 } 627 628 rxrpc_cleanup_call(call); 629 } 630 } 631 632 /* 633 * Final call destruction - but must be done in process context. 634 */ 635 static void rxrpc_destroy_call(struct work_struct *work) 636 { 637 struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); 638 struct rxrpc_net *rxnet = call->rxnet; 639 640 rxrpc_delete_call_timer(call); 641 642 rxrpc_put_connection(call->conn); 643 rxrpc_put_peer(call->peer); 644 kmem_cache_free(rxrpc_call_jar, call); 645 if (atomic_dec_and_test(&rxnet->nr_calls)) 646 wake_up_var(&rxnet->nr_calls); 647 } 648 649 /* 650 * Final call destruction under RCU. 651 */ 652 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 653 { 654 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 655 656 if (in_softirq()) { 657 INIT_WORK(&call->processor, rxrpc_destroy_call); 658 if (!rxrpc_queue_work(&call->processor)) 659 BUG(); 660 } else { 661 rxrpc_destroy_call(&call->processor); 662 } 663 } 664 665 /* 666 * clean up a call 667 */ 668 void rxrpc_cleanup_call(struct rxrpc_call *call) 669 { 670 struct rxrpc_txbuf *txb; 671 672 _net("DESTROY CALL %d", call->debug_id); 673 674 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 675 676 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 677 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 678 679 rxrpc_cleanup_ring(call); 680 while ((txb = list_first_entry_or_null(&call->tx_buffer, 681 struct rxrpc_txbuf, call_link))) { 682 list_del(&txb->call_link); 683 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 684 } 685 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 686 rxrpc_free_skb(call->acks_soft_tbl, rxrpc_skb_cleaned); 687 688 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 689 } 690 691 /* 692 * Make sure that all calls are gone from a network namespace. To reach this 693 * point, any open UDP sockets in that namespace must have been closed, so any 694 * outstanding calls cannot be doing I/O. 695 */ 696 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 697 { 698 struct rxrpc_call *call; 699 700 _enter(""); 701 702 if (!list_empty(&rxnet->calls)) { 703 spin_lock_bh(&rxnet->call_lock); 704 705 while (!list_empty(&rxnet->calls)) { 706 call = list_entry(rxnet->calls.next, 707 struct rxrpc_call, link); 708 _debug("Zapping call %p", call); 709 710 rxrpc_see_call(call); 711 list_del_init(&call->link); 712 713 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 714 call, refcount_read(&call->ref), 715 rxrpc_call_states[call->state], 716 call->flags, call->events); 717 718 spin_unlock_bh(&rxnet->call_lock); 719 cond_resched(); 720 spin_lock_bh(&rxnet->call_lock); 721 } 722 723 spin_unlock_bh(&rxnet->call_lock); 724 } 725 726 atomic_dec(&rxnet->nr_calls); 727 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 728 } 729